JP5749507B2 - Single-end closed tubular flame burner - Google Patents

Description

  The present invention provides fuel gas and air to the combustion chamber from a slit opened along the tube axis direction of a cylindrical combustion chamber having one end closed and the other end opened. The present invention relates to a one-end closed tubular flame burner that swirls and burns an air-fuel mixture, or a mixture of fuel gas, air, fuel gas, and air eccentrically.

  In recent years, various types of fuels such as gas, liquid, or pulverized solid can be burned for general use, which can be compacted in outer shape and can be applied to industrial, commercial, and household combustion equipment. As a combustor that can be used, a one-end closed tubular flame burner is used. Such a one-end closed type tubular flame burner has a fuel in the combustion chamber from a slit opened along the tube axis direction of a cylindrical combustion chamber having one end closed and the other end opened. The swirl combustion is performed by introducing the gas and air separately, or the mixture of the fuel gas and air, or the fuel gas and the air alone and the combination of the fuel gas and the air and introducing the eccentricity. It is configured.

  In such a one-end closed tubular flame burner, conventionally, as a configuration for adjusting the flame forming position, a spacer is placed at the closed end of the one-end closed tubular flame burner, and the position of the spacer is moved according to the amount of combustion to form a flame. Some are configured to adjust position. Moreover, it is comprised so that the overheating burning of a combustion chamber downstream part (opening side edge part) may be prevented by reducing an open end (for example, refer patent document 1).

Japanese Patent No. 3358527

  Since there is no flow from the upstream side (closed end side) in the tube axis direction in the vicinity of the closed end of such a one-end closed type tubular flame burner, the upstream side (closed end) from the slit for introducing fuel gas or air. Also in the position of the side), the combustible mixture is diffused to form a tubular flame. There is a limit to predicting in advance what position the end of the flame forming position on the upstream side in the tube axis direction will be. Therefore, in the design of such a burner, it is necessary to provide a relatively large space in the vicinity of the closed end of the one-end closed tubular flame burner in order to prevent overheating burnout at the closed end. This not only made the design of the closed tubular flame burner difficult, but also contributed to an increase in the size of the burner.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent deformation and burnout due to overheating of the closed end of the one-end closed tubular flame burner and to make the burner compact. is there.

The one-end closed type tubular flame burner of the present invention is a fuel which enters the combustion chamber from a slit opened along the tube axis direction of a cylindrical combustion chamber having one end closed and the other end opened. Gas and air are swirled by introducing an air-fuel mixture of fuel gas and air, or an air-fuel mixture of fuel gas and air and fuel gas and air eccentrically. It is configured to introduce air or a lean air-fuel mixture having a concentration equal to or lower than the combustion limit concentration to the closed end in the tube axis direction in the chamber ,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and when the measured temperature is equal to or higher than a preset first set temperature, the closed end in the tube axis direction of the combustion chamber In this point, control is performed to increase the amount of air introduced into the section or the amount of lean air-fuel mixture below the combustion limit concentration .

  In other words, air or a lean mixture having a concentration equal to or lower than the combustion limit concentration is introduced into the closed end portion in the tube axis direction in the combustion chamber. It is covered with a lean air-fuel mixture having a concentration lower than that, and no flame is formed in the vicinity of the closed end portion. In addition, due to the flow of the introduced air or lean mixture as a whole in the direction of the combustion chamber tube axis, the tubular flame is swept away toward the opening in the direction of the tube axis in the combustion chamber, leaving a certain distance from the inner surface of the closed end. Formed. Due to these effects, the closed end (blocked wall) in the tube axis direction in the combustion chamber can prevent deformation and burnout due to overheating.

Therefore, it is not necessary to take a large space for preventing overheating of the closed end on the closed end side of the combustion chamber, and deformation due to overheating of the closed end (closed wall) of the one-end closed tubular flame burner, Burnout was prevented and the burner could be made compact.
FIG. 10 shows the temperature near the closed end in the tube axis direction of the combustion chamber and the air when the flow rate of the fuel gas is constant and the rotational speed of the blower fan that supplies air to the combustion chamber is reduced. It is the experimental result which showed the change about ratio. Experiments 1 to 4 show the case where the flow rate of the fuel gas is constant at 11.4 (L / min) and the rotational speed of the blower fan is reduced. Experiments 5 to 8 show the case where the flow rate of the fuel gas is kept constant at 12 (L / min) and the rotational speed of the blower fan is reduced. Experiments 9 to 13 show a case where the flow rate of the fuel gas is kept constant at 11 (L / min) and the rotational speed of the blower fan is reduced.
According to the table of FIG. 10, when the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber and the air ratio are compared, in Experiments 1 to 3, Experiments 5 to 7, and Experiments 9 to 12, the temperature is The air ratio is gradually increasing and the air ratio is gradually decreasing. And in Experiment 4, Experiment 8, and Experiment 13, while the temperature is rising rapidly, the air ratio is rapidly decreasing. Thereby, it turns out that there is a strong correlation between the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber and the air ratio. When the flame in the combustion chamber is located close to the closed end in the tube axis direction, the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber rises rapidly, and combustion occurs. As a result, the combustion chamber pressure increases and the air flow rate decreases and the air ratio rapidly decreases.
Therefore, from the experimental results in the table of FIG. 10, when the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber rises rapidly, the flame forming position is closed on the closed side in the tube axis direction of the combustion chamber. It can be said that it is close to the end, for example, that the flame appears to be in contact with the closed end. Conversely, when the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber does not increase rapidly, the position where the flame is formed is separated from the closed end in the tube axis direction of the combustion chamber (for example, It can be said that it is the open end side with respect to the center of the combustion chamber in the tube axis direction of the combustion chamber.
Therefore, the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and the flame forming position is in the closed end in the tube axis direction of the combustion chamber depending on whether or not the temperature is rising rapidly. Or a position where the flame formation position is far from the closed end in the tube axis direction of the combustion chamber (for example, the open end of the combustion chamber in the tube axis direction than the center portion of the combustion chamber). Side)).
According to this characteristic configuration, when the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is equal to or higher than the first preset temperature set in advance, the flame forming position is in the closed end in the tube axis direction of the combustion chamber. Is determined to be close to the combustion chamber, and control is performed to increase the amount of air introduced to the closed side end portion in the tube axis direction of the combustion chamber or the amount of lean air-fuel mixture below the combustion limit concentration. By performing this control, the flame forming position is located away from the closed end in the tube axis direction of the combustion chamber from the state close to the closed end in the tube axis direction of the combustion chamber (for example, combustion (The open end side of the center of the combustion chamber in the direction of the tube axis of the chamber), so that generation of combustion noise associated with combustion vibration can be suppressed, and the closed end of the combustion chamber in the direction of the tube axis It is possible to prevent deformation and burnout due to overheating at the portion (blocking wall).
The one-end closed type tubular flame burner of the present invention is a fuel which enters the combustion chamber from a slit opened along the tube axis direction of a cylindrical combustion chamber having one end closed and the other end opened. Gas and air are swirled by introducing an air-fuel mixture of fuel gas and air, or an air-fuel mixture of fuel gas and air and fuel gas and air eccentrically. It is configured to introduce air or a lean air-fuel mixture having a concentration equal to or lower than the combustion limit concentration to the closed end in the tube axis direction in the chamber,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and when the measured temperature is equal to or higher than a preset second set temperature, the supply of fuel gas to the combustion chamber is stopped. Thus, control is performed to stop combustion.
In other words, air or a lean mixture having a concentration equal to or lower than the combustion limit concentration is introduced into the closed end portion in the tube axis direction in the combustion chamber. It is covered with a lean air-fuel mixture having a concentration lower than that, and no flame is formed in the vicinity of the closed end portion. In addition, due to the flow of the introduced air or lean mixture as a whole in the direction of the combustion chamber tube axis, the tubular flame is swept away toward the opening in the direction of the tube axis in the combustion chamber, leaving a certain distance from the inner surface of the closed end. Formed. Due to these effects, the closed end (blocked wall) in the tube axis direction in the combustion chamber can prevent deformation and burnout due to overheating.
Therefore, it is not necessary to take a large space for preventing overheating of the closed end on the closed end side of the combustion chamber, and deformation due to overheating of the closed end (closed wall) of the one-end closed tubular flame burner, Burnout was prevented and the burner could be made compact.
Further, as described in the above characteristic configuration, the flame formation position is close to or separated from the closed end in the tube axis direction of the combustion chamber depending on the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber. Can be determined. Therefore, according to the present characteristic configuration, in order to suppress the generation of combustion noise accompanying combustion vibration, and to prevent deformation and burning due to overheating at the closed side end portion (closed wall) in the tube axis direction in the combustion chamber, When the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is equal to or higher than a preset second set temperature, the supply of fuel gas to the combustion chamber is stopped to stop the combustion. Yes.
The one-end closed type tubular flame burner of the present invention is a fuel which enters the combustion chamber from a slit opened along the tube axis direction of a cylindrical combustion chamber having one end closed and the other end opened. Gas and air are swirled by introducing an air-fuel mixture of fuel gas and air, or an air-fuel mixture of fuel gas and air and fuel gas and air eccentrically. It is configured to introduce air or a lean air-fuel mixture having a concentration equal to or lower than the combustion limit concentration to the closed end in the tube axis direction in the chamber,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and when the measured temperature is equal to or higher than a preset third set temperature, the closed end in the tube axis direction of the combustion chamber When the amount of air or lean mixture below the combustion limit concentration is increased and the air amount or lean mixture reaches the upper limit, the supply of fuel gas to the combustion chamber is stopped. It is the point which is comprised so that control which stops combustion may be performed.
In other words, air or a lean mixture having a concentration equal to or lower than the combustion limit concentration is introduced into the closed end portion in the tube axis direction in the combustion chamber. It is covered with a lean air-fuel mixture having a concentration lower than that, and no flame is formed in the vicinity of the closed end portion. In addition, due to the flow of the introduced air or lean mixture as a whole in the direction of the combustion chamber tube axis, the tubular flame is swept away toward the opening in the direction of the tube axis in the combustion chamber, leaving a certain distance from the inner surface of the closed end. Formed. Due to these effects, the closed end (blocked wall) in the tube axis direction in the combustion chamber can prevent deformation and burnout due to overheating.
Therefore, it is not necessary to take a large space for preventing overheating of the closed end on the closed end side of the combustion chamber, and deformation due to overheating of the closed end (closed wall) of the one-end closed tubular flame burner, Burnout was prevented and the burner could be made compact.
Further, as described in the above characteristic configuration, the flame formation position is close to or separated from the closed end in the tube axis direction of the combustion chamber depending on the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber. Can be determined. Therefore, according to the present characteristic configuration, in order to suppress the generation of combustion noise accompanying combustion vibration, and to prevent deformation and burning due to overheating at the closed side end portion (closed wall) in the tube axis direction in the combustion chamber, When the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is equal to or higher than a preset third set temperature, the amount of air introduced to the closed end in the tube axis direction of the combustion chamber or the combustion limit concentration or less Control is performed to increase the amount of lean mixture. Further, according to this feature, not only the air amount or lean mixture amount is increased, but also the supply of fuel gas to the combustion chamber is stopped even when the air amount or lean mixture amount reaches the upper limit value. By performing the control to stop the combustion in this way, it is possible to appropriately prevent the generation of combustion noise and the deformation and burnout due to overheating at the closed end in the tube axis direction in the combustion chamber.
The one-end closed type tubular flame burner of the present invention is a fuel which enters the combustion chamber from a slit opened along the tube axis direction of a cylindrical combustion chamber having one end closed and the other end opened. Gas and air are swirled by introducing an air-fuel mixture of fuel gas and air, or an air-fuel mixture of fuel gas and air and fuel gas and air eccentrically. It is configured to introduce air or a lean air-fuel mixture having a concentration equal to or lower than the combustion limit concentration to the closed end in the tube axis direction in the chamber,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and the closed end in the tube axis direction of the combustion chamber is set so that the measured temperature is within a preset setting range. It is configured to perform control to increase / decrease the amount of air to be introduced into the gas or the amount of lean mixture below the combustion limit concentration.
In other words, air or a lean mixture having a concentration equal to or lower than the combustion limit concentration is introduced into the closed end portion in the tube axis direction in the combustion chamber. It is covered with a lean air-fuel mixture having a concentration lower than that, and no flame is formed in the vicinity of the closed end portion. In addition, due to the flow of the introduced air or lean mixture as a whole in the direction of the combustion chamber tube axis, the tubular flame is swept away toward the opening in the direction of the tube axis in the combustion chamber, leaving a certain distance from the inner surface of the closed end. Formed. Due to these effects, the closed end (blocked wall) in the tube axis direction in the combustion chamber can prevent deformation and burnout due to overheating.
Therefore, it is not necessary to take a large space for preventing overheating of the closed end on the closed end side of the combustion chamber, and deformation due to overheating of the closed end (closed wall) of the one-end closed tubular flame burner, Burnout was prevented and the burner could be made compact.
Further, as described in the above characteristic configuration, the flame formation position is close to or separated from the closed end in the tube axis direction of the combustion chamber depending on the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber. Can be determined. Therefore, according to this characteristic configuration, the combustion chamber is introduced into the closed end of the combustion chamber in the tube axis direction so that the temperature in the vicinity of the closed end of the combustion chamber in the tube axis direction is within a preset setting range. By controlling to increase or decrease the amount of air or lean mixture below the combustion limit concentration, the vibration formation position is maintained in an appropriate state away from the closed end in the tube axis direction of the combustion chamber. It is possible to suppress the generation of combustion noise accompanying the above, and to prevent deformation and burnout due to overheating at the closed end (blocked wall) in the tube axis direction in the combustion chamber. That is, when the flame formation position is close to the closed end in the tube axis direction of the combustion chamber, the temperature near the closed end in the tube axis direction of the combustion chamber becomes higher than the set range. Increase the amount of air or lean mixture so that the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is within the set range, and the flame formation position is separated from the closed end in the tube axis direction of the combustion chamber. You can be in the proper state. Conversely, if the flame formation position is too far from the closed end in the tube axis direction of the combustion chamber, the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber becomes lower than the set range. Reduce the amount of lean mixture so that the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is within the set range, and the flame formation position is separated from the closed end in the tube axis direction of the combustion chamber. It can be in a state.

  A further characteristic configuration of the one-end closed tubular flame burner of the present invention is the same as the above-described characteristic configuration, in which the air or the lean air-fuel mixture introduced into the closed side end is the same as the swirl direction of the swirl combustion. The point is to introduce in the direction.

  That is, since the air or the lean mixture is introduced in the same direction as the turning direction of the turning combustion, the air or the lean mixture is introduced along or in the vicinity of the inner surface of the closed end. Then, the swirl in the same direction as the swirl direction of the swirl combustion allows the inner surface of the closed end to be covered with air or a lean air-fuel mixture, so that the cooling of the wall of the closed end and the extrusion effect of the flame can be obtained simultaneously. Will be.

  In other words, in order to push out the tubular flame in the tube axis direction, it is effective to introduce air or a lean mixture to the tube axis direction blocking side. On the other hand, the tubular flame is a flame that floats completely in space, and burns without anywhere, so unlike the general burner flame that uses the backflow downstream of the bluff body for flame holding, The flame formation position is indefinite, and is easily pushed away by the flow in the tube axis direction, resulting in the same result as lifting (sparkling, blowing off) with a general burner. Therefore, in order to extrude the tubular flame slightly in the tube axis direction to disengage it from the wall surface of the closed side end portion and to cool the closed side end portion, for example, the wall surface of the closed side end portion is formed of a porous plate. Therefore, it is necessary to adopt a method of introducing air or the like through a porous plate. In this case, the structure is complicated, for example, an air supply pipe is connected to the outside of the combustion chamber at the closed end, and there is a problem that it is difficult to attach a spark plug, a frame rod, a viewing window or the like to the closed end. .

  Therefore, according to the present characteristic configuration, by using a part of the slit for forming the tubular flame or separately, by blowing air or a lean mixture in the circumferential direction of the combustion chamber inner surface and the swirling direction of the flame, It is possible to prevent deformation and burning due to overheating of the closed side end (closed wall) in the tube axis direction in the combustion chamber, and to easily and compactly configure the burner even when accessory parts such as a spark plug are attached to the closed wall. It became something that could be done.

  A further characteristic configuration of the one-end closed tubular flame burner of the present invention is that, in addition to the above-described characteristic configuration, the flow rate per unit area of the air introduced in the vicinity of the opening in the tube axis direction in the combustion chamber is Is higher than the average air flow rate per unit area of air introduced into the combustion chamber on the closed end side in the tube axis direction, or the concentration of the air-fuel mixture introduced near the opening in the tube axis direction in the combustion chamber However, there exists in the point set so that it may become lower than the average mixture density | concentration of the mixture introduced into the said combustion chamber.

  As described above, since the tubular flame is formed in the space of the combustion chamber without a foot, the flame forming position is changed by being influenced by a slight flow in the tube axis direction. Therefore, when the flow of air or the like is applied as described above from the vicinity of the closed end, that is, the most upstream portion in the tube axis direction, the flame forming position moves downstream in the tube axis direction. On the other hand, if a flow rate larger than the flow rate of air or the like passing through the slit is passed from the vicinity of the open end of the combustion chamber, that is, the most downstream portion in the tube axis direction, and resistance to the flow in the tube axis direction, Move upstream in the axial direction. In other words, when it is desired to increase the flow rate of air or the like upstream in the tube axis direction introduced to avoid overheating of the combustion chamber wall, the flow rate of air or the like introduced downstream in the tube axis direction is also increased so as not to balance. As long as it is not possible to prevent a blow-off and form a stable flame. Therefore, in order to stably form a tubular flame in which it is difficult to predict the flame formation position in advance, the flow in the tube axis direction added to the upstream side in the tube axis direction and the downstream side in the tube axis direction are necessary. What is necessary is just to balance the resistance (pressure loss) of the flow in the pipe axial direction to be added.

  Therefore, in this feature configuration, the flow rate per unit area of the air introduced in the vicinity of the opening in the tube axis direction in the combustion chamber is larger than the average air flow rate introduced into the combustion chamber or in the combustion chamber. By setting the concentration introduced near the opening in the tube axis direction to be lower than the average mixture concentration introduced into the combustion chamber, air or the like flows near the opening in the tube axis direction in the combustion chamber. It is possible to prevent the flame from being pushed out (lifted) downstream in the tube axis direction by adding. Therefore, it has become possible to achieve both prevention of deformation and burning due to overheating of the closed side end (closed wall) of the combustion chamber and formation of a stable tubular flame.

  A further characteristic configuration of the one-end closed tubular flame burner of the present invention is that, in addition to the above-described characteristic configuration, the area of the opening of the combustion chamber is smaller than the area of the combustion chamber in a sectional view.

  That is, since the area of the opening is smaller than the area of the combustion chamber in a sectional view, the pressure loss can be increased with respect to the direction in which the cylindrical combustion chamber is pushed downstream. When it is desired to increase the flow rate of air or the like on the upstream side in the tube axis direction to avoid overheating of the closed end (blocking wall) in the tube axis direction in the combustion chamber, the diameter of the opening of the combustion chamber It would be good to reduce more. Accordingly, it is possible to balance the resistance (pressure loss) of the flow in the tube axis direction added to the upstream side in the tube axis direction and the resistance (pressure loss) of the flow in the tube axis direction added to the downstream side in the tube axis direction. Can be prevented from being pushed out (lifted) to prevent deformation and burning due to overheating of the closed end (blocked wall) in the tube axis direction in the combustion chamber, and form a stable tubular flame It becomes possible to achieve both.

In addition, when the opening of the combustion chamber is formed of metal or the like, the diameter of the portion increases due to the diameter reduction, and there is a risk of burning. In this case, introducing cooling air in the vicinity of the opening in the tube axis direction in the combustion chamber can be one of the measures against overheating. Therefore, as described above, by setting the flow rate of air introduced to the vicinity of the opening in the tube axis direction in the combustion chamber and the concentration of the air-fuel mixture, it is possible to obtain a flame extrusion suppression effect and Preventive measures can also be taken.
As described above, the diameter of the opening in the tube axis direction in the combustion chamber is reduced, or in combination, the flow rate of air introduced into the vicinity of the opening in the tube axis direction in the combustion chamber and the concentration of the air-fuel mixture are set. Thus, it is possible to prevent both deformation and burnout due to overheating of the closed end (blocked wall) in the tube axis direction in the combustion chamber and to form a stable tubular flame.

  A further characteristic configuration of the one-end closed tubular flame burner of the present invention is that the upstream end of the air introduction range eccentrically introduced into the combustion chamber by the slit is eccentric to the combustion chamber by the slit. It is in the point set so that it may become the upstream of the upstream of the upstream side of the introduction range of the introduced fuel gas in the tube axis direction of the combustion chamber.

  According to this feature configuration, in the tube axis direction in the combustion chamber, the air introduction range is expanded to the upstream side, which is the closed end portion of the fuel gas introduction range, and the air introduced from the slit is combusted. It can be present in the vicinity of the closed end in the tube axis direction of the chamber. Therefore, it is possible to appropriately suppress the formation of a flame in the vicinity of the closed side end, and it is possible to accurately prevent deformation and burning due to overheating at the closed side end (closed wall) in the tube axis direction in the combustion chamber.

The perspective view of the tubular flame burner in this invention II-II sectional view in FIG. III-III sectional view in FIG. Assembly perspective view of tubular flame burner in the present invention The figure which shows the slit formation member for gas in this invention The figure which shows the slit formation member for air in this invention Assembly perspective view of tubular flame burner in the second embodiment Vertical sectional view of a tubular flame burner in the second embodiment Schematic view in cross section showing a schematic configuration of the tubular flame burner in the second embodiment Changes in temperature and air ratio in the vicinity of the closed end of the combustion chamber in the tube axis direction when the flow rate of the fuel gas is constant and the rotational speed of the blower fan that supplies air to the combustion chamber is reduced. Experimental results showing Schematic diagram in cross section showing a schematic configuration of the tubular flame burner in the third embodiment The figure which shows the air orifice which concerns on another embodiment

Hereinafter, an embodiment of a one-end closed tubular flame burner according to the present invention will be described based on the drawings.
[First Embodiment]
As shown in FIGS. 1 to 3, the one-end closed tubular flame burner 1 according to the present invention has one end closed by an end plate 40 (blocking wall) and the other end in an opening provided in the front flange 50. A cylindrical combustion chamber N opened on the side, and a slit 22s for air and a slit 32s for gas opening along the tube axis direction (Y direction in the drawing) on the side surface of the cylindrical combustion chamber N. . Then, fuel gas and air are separately introduced into the tangential direction of the side wall of the combustion chamber N from the air slit 22 s and the gas slit 32 s, and are configured to perform swirl combustion.

  Here, a direction along the tube axis direction of the combustion chamber N is simply expressed as a tube axis direction (Y direction in the drawing), and a direction orthogonal to the tube axis direction is expressed as a tube circumferential direction (X direction in the drawing). . Further, in the formed tubular flame, the closed side end portion side of the combustion chamber N that is the base end side is the upstream side in the tube axis direction, and the open end side of the combustion chamber N that is the flame ejection side is the downstream side in the tube axis direction. Called.

  As shown in FIG. 4, the cylindrical combustion chamber N is formed by combining and attaching an air slit forming member 22 and a gas slit forming member 32. In this embodiment, two air slit forming members 22 and two gas slit forming members 32 are combined. Then, with respect to the cylindrical combustion chamber N formed by combining the air slit forming member 22 and the gas slit forming member 32, an end plate 40 is attached to one end side in the tube axis direction, and the other end side. By attaching a front flange 50 having an opening 50h to the combustion chamber N, one end in the tube axis direction is closed and the other end is opened. The end plate 40 is formed in a disc shape, and the spark plug hole 40a and the frame rod hole 40b are formed in a separated state. And it is comprised so that the ignition plug and flame | frame rod which are not shown in figure through the exterior and the inside of the combustion chamber N may be attached. The front flange 50 also serves as a flange for attaching the burner to the heat utilization device.

In this embodiment, although not shown, each member is configured to be fixed by screwing. However, the mounting method is not limited to such a method, and each member is provided with a fitting portion and a fitted portion, and a fitting and fitting form or a combination of fitting and screwing is used. Various attachment methods can be applied as long as the heat resistance strength such as form is not impaired.
Hereinafter, in the tube axis direction, an end side to which the end plate 40 is attached is referred to as a closed end side, an end side to which the front flange 50 is attached is referred to as an open end side, and an end portion closed by the end plate 40 is referred to as a closed side end. Part.

  Further, the air chamber 20 is attached to the outside of the air slit forming member 22 in the radial direction of the combustion chamber N with the air orifice 21 fitted therein, and the gas slit forming member 32 is arranged outside of the combustion chamber N in the radial direction. The gas chamber 30 is attached in a state where the gas orifice 31 is fitted. Although not shown, a supply pipe for supplying air is connected to the air chamber 20, and a blower fan or a blower is attached to the supply pipe to take in external air as an oxygen-containing gas and supply the air. It is configured to pump into a tube. The oxygen-containing gas is used as an oxidant for burning fuel gas, and an oxygen-containing gas other than external air can also be used. Although not shown, the gas chamber 30 is connected to a supply pipe for supplying fuel gas.

  As shown in FIG. 3, the air injected into the combustion chamber N is introduced into the space 22v from the through hole 21h provided in the air orifice 21 and passes through the air slit 22s. It is ejected in the tangential direction of the cylindrical combustion chamber N. With respect to the fuel gas ejected into the combustion chamber N, the fuel gas introduced into the gas chamber 30 is guided to the space 32v from the through hole 31h provided in the gas orifice 31, and passes through the gas slit 32s to form a cylindrical combustion chamber. It is ejected in the tangential direction of N. In this way, the combustion chamber N is configured to be eccentrically introduced separately into the fuel gas and air, and swirl and burned.

The air slit forming member 22 and the gas slit forming member 32 will be described.
As shown in FIG. 6, the air slit forming member 22 includes a peripheral wall forming portion 22 a that is a portion corresponding to a quarter of the peripheral wall in the cylindrical combustion chamber N and a linear portion 22 b other than the peripheral wall forming portion 22 a. Has been. Further, as shown in FIG. 5, the gas slit forming member 32 includes a peripheral wall forming portion 32 a that is a portion corresponding to ¼ of the peripheral wall in the cylindrical combustion chamber N and a linear portion 32 b other than that. Configured. And as shown in FIG.3 and FIG.4, the cylindrical combustion chamber N is formed by combining four in the state which each member 22 and 32 which comprises a pair opposes. Hereinafter, a member in which the combustion chamber N is formed by combining the air slit forming member 22 and the gas slit forming member 32 may be referred to as a combustion chamber forming portion M.

As shown in FIG. 5, a concave portion serving as a gas introduction path is provided on the outer wall surface of the peripheral wall forming portion 32 a of the gas slit forming member 32, and the end of the peripheral wall forming portion 32 a of the gas slit forming member 32 is provided. The portion is provided with a slit forming recess 32c.
Further, as shown in FIG. 6, a concave portion serving as an air introduction path is provided on the outer wall surface of the peripheral wall forming portion 22 a of the air slit forming member 22, and the peripheral wall forming portion of the air slit forming member 22. A slit forming recess 22c is provided at the end of 22a.
The slit forming recesses 22c and 32c are formed on the peripheral wall surface that becomes the combustion chamber N when the combustion chamber forming portion M is configured by combining the air slit forming member 22 and the gas slit forming member 32 as shown in FIG. It opens along the tube axis direction. That is, the opening formed by the slit forming recess 22c becomes the air slit 22s, and the opening formed by the slit forming recess 32c becomes the gas slit 32s.

  Each of the air slit forming member 22 and the gas slit forming member 32 is integrally formed by casting or the like, for example. The slit forming recesses 22c and 32c are formed by cutting the end portions of the integrally formed air slit forming member 22 and the peripheral wall forming portions 22a and 32a of the gas slit forming member 32, respectively. At the same time, a plurality of uncut portions are formed in a state of being separated in the pipe circumferential direction. The uncut portion includes a partition wall 22k that divides the fluid flow paths of the air slit 22s and the gas slit 32s into a plurality of flow paths in a state where the air slit forming member 22 and the gas slit forming member 32 are combined. 32k.

  In other words, as shown in FIG. 5, the end of the peripheral wall forming portion 32a is continuous from the outer peripheral surface of the peripheral wall forming portion 32a of the gas slit forming member 32 to the inner surface of the peripheral wall. The slit forming recess 32c is formed by cutting. At this time, the width of the cutting portion is about 10 times or less than the cutting depth of the slit forming recess 32c of the gas slit 32s, and the interval between the adjacent cutting portions is about 2 mm or less, and is substantially orthogonal to the tube axis direction. The flow path is formed in the direction of the pipe, that is, in the pipe circumferential direction, and the plurality of partition walls 32k are separated from each other in the pipe axis direction. Further, both end portions of the partition wall 32k on the outer side of the peripheral wall and the inner side of the peripheral wall are formed with curved corners as shown in FIG. 5C in plan view, and on the inner side of the peripheral wall. The end is in a state of being retreated to the upstream side in the gas flow direction.

  In addition, as shown in FIG. 6, slits are formed at the end of the peripheral wall forming portion 22a in a state of being continuous from the outer wall surface of the peripheral wall forming portion 22a of the air slit forming member 22 to the inner surface of the peripheral wall. The recess 22c is formed by cutting. At this time, similarly to the gas slit forming member 32, the width of the cutting portion is about 10 times or less than the cutting depth of the slit forming recess 22c of the air slit 22s, and the interval between adjacent cutting portions is about 2 mm or The flow path is formed in a direction substantially perpendicular to the tube axis direction, that is, in the tube circumferential direction, and a plurality of partition walls 22k are separated from each other in the tube axis direction. In addition, both end portions of the partition wall 22k on the outer side of the peripheral wall and the inner side of the peripheral wall are formed with curved corners in plan view, and the end portion on the inner side of the peripheral wall is upstream in the gas flow direction. Retired.

In the present embodiment, the cutting depth of the slit forming recess 32c is about 1/3 of the interval between adjacent cutting portions, that is, the interval between adjacent partition walls 32k, and the cutting depth of the slit forming recess 22c. The distance is set to about 1/3 of the interval between adjacent cutting portions, that is, the interval between adjacent partition walls 22k.
The partition wall 22k or 32k rectifies the air or air-fuel mixture ejected from the air slit 22s or the gas slit 32s, and, as will be described later, partially cools the closed end and the open end of the fuel gas passage. When this is used for the air passage, the fuel gas and air are prevented from being mixed.

  The gas orifice 31 is formed in a plate shape as shown in FIG. The gas orifice 31 is arranged in the tube axis direction on the side of the peripheral wall forming portion 32a of the gas slit forming member 32 and is spaced from both ends of the gas orifice 31 in the tube axis direction and closer to the center portion. The three through-holes 31h are drilled at equal intervals so as to be.

The gas chamber 30 is provided with a gas introduction space, and two gas supply holes 30a and 30b are provided in the gas introduction space so as to be separated from each other in the tube axis direction. The gas chamber 30 is configured to be attachable to the gas slit forming member 32 in a state in which the gas orifice 31 is fitted.
Accordingly, the fuel gas introduced into the gas introduction space of the gas chamber 30 passes through the three through holes 31 h of the gas orifice 31, the surface on the outer peripheral wall side of the peripheral wall forming portion 32 a of the gas slit forming member 32, It will be introduced into the space 32v surrounded by the orifice 31 and the linear portion 22b of the air slit forming member 22. As described above, the through hole 31h is provided closer to the central portion of the gas orifice 31 in the tube axis direction, and the distribution of the fuel gas is intended to be a high concentration in the central portion of the combustion chamber N. doing.

  The air orifice 21 is formed in a plate shape as shown in FIG. Then, four through holes 21h are formed at equal intervals in the air orifice 21 on the side of the peripheral wall forming portion 22a of the air slit forming member 22 in a state of being aligned in the tube axis direction.

The air chamber 20 is provided with an air introduction space, and an air supply opening 20a is provided on a side surface side of the air introduction space. And the air chamber 20 is comprised so that attachment to the slit formation member 22 for air is possible in the state which the air orifice 21 fits.
Therefore, the air introduced into the gas introduction space of the air chamber 20 passes through the four through holes 21h provided in the air orifice 21 and is a surface on the outer peripheral wall side of the peripheral wall forming portion 22a of the air slit forming member 22. The air orifice 21 is introduced into the space 22v surrounded by the linear portion 32b of the gas slit forming member 32. As described above, the through holes 21h are provided so as to be evenly arranged in the tube axis direction of the air orifice 21, and the distribution of the amount of air to be ejected is uniform over the tube axis direction of the combustion chamber N. It becomes.

Hereinafter, the characteristic configuration of the one-end closed tubular flame burner according to the present invention will be described.
As shown in FIG. 4, on the linear portion 22b side of the air slit forming member 22 in the air orifice 21, a gas side through small hole 21b is positioned on the closed end side in the tube axis direction, and the gas side through large hole 21a. Is drilled so as to be located on the open end side in the tube axis direction. The air slit forming member 22 is provided with two through holes 22h spaced apart in the tube axis direction in the linear portion 22b. The through hole 22h is provided at a position communicating with the gas side through large hole 21a and the gas side through small hole 21b of the air orifice 21, respectively. The through hole 22h has a hole diameter that is substantially the same as or slightly larger than the hole diameters of the gas side through hole 21a and the gas side through hole 21b.

  Part of the air introduced into the air introduction space of the air chamber 20 passes through the gas side through hole 21b provided in the air orifice 21 and the through hole 22h provided in the air slit forming member 22, and the closed end of the space 32v. The air is further ejected to the open end side of the space 32v through the gas side through hole 21a provided in the air orifice 21 and the through hole 22h provided in the air slit forming member 22. The air introduced to the closed end side of the space 32v through the gas side through small hole 21b and the through hole 22h is mixed with the fuel gas supplied through the three through holes 31h of the gas orifice 31 in the space 32v. The air-fuel mixture is jetted in the tangential direction of the cylindrical combustion chamber N through the gas slit 32 s to the closed end of the combustion chamber N in the tube axis direction. Further, the air introduced to the open end side of the space 32v through the gas side through large holes 21a and 22h is mixed with the fuel gas supplied through the three through holes 31h of the gas orifice 31 in the space 32v. The air-fuel mixture is jetted in the tangential direction of the cylindrical combustion chamber N to the open end of the combustion chamber N in the tube axis direction through the gas slit 32s.

  In this way, in the one-end closed tubular flame burner 1 according to the present invention, as shown by A1 in FIG. 2, a part of the air introduced into the air introduction space of the air chamber 20 is removed from the gas side through small hole. 21b, through-hole 22h, space 32v, and gas slit 32s are introduced into the closed end of the combustion chamber N in the tube axis direction so that air is introduced into the closed end of the combustion chamber N in the tube axis direction. Yes. As a result, the vicinity of the inner surface of the closed end of the combustion chamber N is covered with air or a lean air-fuel mixture having a concentration equal to or lower than the combustion limit concentration, and a flame is generated at the closed end (near the end plate 40) of the one-end closed tubular flame burner 1. It will not be formed. Further, the introduced air is caused to flow downstream in the tube axis direction of the combustion chamber N as a whole, and the tubular flame is pushed downstream in the tube axis direction, and is formed at a certain distance from the inner surface of the end plate 40. . These effects can prevent deformation and burnout due to overheating of the end plate 40. Since no cooling structure is required on the wall of the end plate 40, a spark plug, a flame detection sensor, a viewing window and the like can be easily attached to the end plate 40 by a normal method, and the overall compact. This contributed to the construction of a simple burner.

  Then, when air is introduced into the closed end portion in the tube axis direction of the combustion chamber N, a configuration for ejecting air and fuel gas into the combustion chamber N is used, and the gas side through small hole 21b is formed in the air orifice 21. And the air slit forming member 22 is provided with a through hole 22h, air can be introduced into the closed end of the combustion chamber N in the tube axis direction. Further, the air introduced into the closed end in the tube axis direction in the combustion chamber N is mixed with the fuel gas in the space 32v and introduced into the combustion chamber N as an air-fuel mixture. The following lean mixture is introduced in the same direction as the swirl direction of swirl combustion.

  In the one-end closed type tubular flame burner 1 according to the present invention, as shown by A2 in FIG. 2, a part of the air introduced into the air introduction space of the air chamber 20 is changed into a gas side through large hole 21a, a through hole 22h, By introducing the opening 32h in the tube axis direction of the combustion chamber N through the space 32v and the gas slit 32s, the flow rate per unit area of the air introduced in the vicinity of the opening 50h in the tube axis direction of the combustion chamber N is reduced. The average air flow rate per unit area of air introduced into the combustion chamber on the closed end side in the tube axis direction is larger than that. In other words, the concentration of the air-fuel mixture introduced in the vicinity of the opening 50h in the tube axis direction of the combustion chamber N is set to be lower than the average air-fuel mixture concentration of the air-fuel mixture introduced into the combustion chamber N. That is.

  Accordingly, a flow rate larger than the flow rate of air or the like passing through the slit from the vicinity of the open end of the combustion chamber N, that is, the most downstream portion (or mixing with a concentration lower than the average mixture concentration of the mixture to be introduced into the combustion chamber N) By introducing gas, resistance can be applied to the flow in the tube axis direction on the opening 50h side, and the flame formation position can be moved upstream. Then, the flow of the air introduced into the vicinity of the inner surface of the end plate 40, that is, the downstream end in the tube axis direction, and the resistance to the downstream flow of the air in the tube axis direction in the vicinity of the opening 50 h of the front flange 50. Therefore, the flame can be stably formed at the intended position. Further, the air supplied to the combustion chamber N through the gas side through hole 21a is for cooling on the open end side (near the opening 50h of the front flange 50).

  Further, in the one-end closed tubular flame burner 1 according to the present invention, the inner diameter of the opening 50 h provided in the front flange 50 is smaller than the inner diameter of the combustion chamber N, that is, the area of the opening 50 h is a cross section of the combustion chamber N. It is configured to be smaller than the visual area. As shown in FIG. 2, the opening 50h has an inner diameter r1, and the combustion chamber N has an inner diameter r2, so that r1 / r2 is 0.8 to 0.9, that is, the opening 50h. Is configured to be 10% to 20% smaller than the inner diameter of the combustion chamber N.

  Thereby, a pressure loss increases with respect to the direction extruded from the opening part 50h of the combustion chamber N to a pipe-axis direction downstream. Accordingly, it is possible to prevent the flow in the tube axis direction added to the upstream side in the tube axis direction from flowing out of the combustion chamber N as it is, and to prevent the flame from being lifted. It is possible to prevent both deformation and burning due to overheating of the wall) and to form a stable tubular flame.

  When the front flange 50 is formed of metal or the like, as described above, the diameter of the opening 50h is reduced to increase the temperature of that portion, resulting in the risk of burning. The air supplied to the combustion chamber N after passing through is used for cooling on the open end side (in the vicinity of the opening 50h of the front flange 50), so that it is possible to obtain an effect of suppressing flame extrusion and to prevent overheating of the front flange 50 and the like. Measures can also be taken. Therefore, it is possible to prevent both deformation and burning due to overheating of the closed end (blocked wall) in the tube axis direction in the combustion chamber N and to form a stable tubular flame.

[Second Embodiment]
The second embodiment is an embodiment in which, in the first embodiment, a configuration for preventing overheating at the closed end in the tube axis direction of the combustion chamber N and performing control for suppressing combustion noise is added. It is a form. Based on FIGS. 7-9, it demonstrates centering around the structure to add, and since it is the same as that of the said 1st Embodiment about the other structure, the description is abbreviate | omitted. FIG. 7 is an assembled perspective view of the tubular flame burner in the second embodiment, similar to FIG. 4 of the first embodiment, and FIG. 8 is a second embodiment similar to FIG. 2 of the first embodiment. It is a longitudinal cross-sectional view of the tubular flame burner in a form, and FIG. 9 is a schematic diagram in the cross section which shows schematic structure of the tubular flame burner in 2nd Embodiment.

  In the first embodiment, as shown in FIGS. 5 and 6, in the air slit forming member 22, the opening formed by the slit forming recess 22 c becomes the air slit 22 s, and in the gas slit forming member 32, The opening formed by the slit forming recess 32c becomes the gas slit 32s. In the air slit forming member 22 and the gas slit forming member 32, the slit forming recess 22c is closer to the closed end in the tube axis direction of the combustion chamber N than the slit forming recess 32c (the lower side in FIGS. 5 and 6). It is extended and formed. As a result, as shown in FIG. 8, the upstream end of the air introduction range Pa that is eccentrically introduced into the combustion chamber N by the air slit 22s is eccentrically introduced into the combustion chamber N by the gas slit 32s. It is on the upstream side in the tube axis direction of the combustion chamber N (lower side in the Y direction in FIG. 8) than the upstream side end portion of the fuel gas introduction range Pg. Thereby, a part of the air introduced into the air introduction space of the air chamber 20 is not only passed through the gas side through hole 21b, the through hole 22h, the space 32v, and the gas slit 32s, but also through the through hole 21h, the space 22v, Even through the air slit 22s, it can be introduced into the closed end of the combustion chamber N in the tube axis direction.

  In the second embodiment, instead of the end plate 40 in the first embodiment, as shown in FIGS. 7 and 8, a first end plate 60 and a second end plate 61 are provided. The 1st end plate 60 is formed in the substantially rectangular shape by which the substantially circular penetration space 60a was formed in the center part. The first end plate 60 has an installation portion 60b for installing various members such as a thermocouple 62 or a spark plug or a flame detection sensor (not shown) in a state of protruding into the through space 60a. It is formed in an extended groove shape. The second end plate 61 is for closing the through space 60a of the first end plate 60, and a viewing window or the like is attached thereto. By installing the first end plate 60 and the second end plate 61 to which the thermocouple 62 is attached, a through space 60a of the first end plate 60 is formed at the closed end of the combustion chamber N in the tube axis direction. It is provided so as to protrude in the tube axis direction of the combustion chamber N in a state communicating with the combustion chamber N. The thermocouple 62 detects the temperature of the through space 60a, thereby measuring the temperature in the vicinity of the closed side end of the combustion chamber N in the tube axis direction.

  FIG. 10 shows the temperature near the closed end in the tube axis direction of the combustion chamber and the air when the flow rate of the fuel gas is constant and the rotational speed of the blower fan that supplies air to the combustion chamber is reduced. It is the experimental result which showed the change about ratio. Experiments 1 to 4 show the case where the flow rate of the fuel gas is constant at 11.4 (L / min) and the rotational speed of the blower fan is reduced. Experiments 5 to 8 show the case where the flow rate of the fuel gas is kept constant at 12 (L / min) and the rotational speed of the blower fan is reduced. Experiments 9 to 13 show a case where the flow rate of the fuel gas is kept constant at 11 (L / min) and the rotational speed of the blower fan is reduced.

According to the table of FIG. 10, in Experiments 1 to 12, the air ratio also decreases as the rotational speed of the blower fan decreases. However, in Experiment 12 and Experiment 13, since the rotation speed of the blower fan is the same, the flow rate of air supplied to the combustion chamber is essentially constant if the rotation speed of the blower fan is essentially the same. Since the flow rate of the fuel gas is constant, the air ratio is also a constant value. However, in Experiment 12 and Experiment 13, it can be seen that the air ratio is decreased.
On the other hand, when the temperature and the air ratio in the vicinity of the closed end in the tube axis direction of the combustion chamber are compared, in Experiments 1 to 3, Experiments 5 to 7, and Experiments 9 to 12, the temperature gradually increases. In addition, the air ratio is gradually decreasing. In Experiment 4, Experiment 8, and Experiment 13, the temperature increases rapidly and the air ratio also decreases abruptly. Thereby, it turns out that there is a strong correlation between the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber and the air ratio. When the flame in the combustion chamber is located close to the closed end in the tube axis direction, the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber rises rapidly, and combustion occurs. Oscillates (oscillates) and the combustion chamber pressure increases, resulting in a decrease in the air flow rate and a sudden decrease in the air ratio.

As described above, from the experimental results in the table of FIG. 10, when the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber rises rapidly, the flame formation position is in the tube axis direction of the combustion chamber. It was close to the closed side end, and for example, it was in a state that the flame seemed to be in contact with the closed side end by visual inspection. Conversely, when the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber does not increase rapidly, the position where the flame is formed is separated from the closed end in the tube axis direction of the combustion chamber (for example, In the direction of the tube axis of the combustion chamber, it was the open end side of the center of the combustion chamber).
Therefore, the temperature near the closed end of the combustion chamber N in the tube axis direction of the combustion chamber N is measured by the thermocouple 62, and the flame forming position is determined depending on whether or not the temperature is rising rapidly. In the direction close to the closed end or the position where the flame is formed is away from the closed end in the tube axis direction of the combustion chamber (for example, the combustion chamber in the tube axis direction of the combustion chamber). It is possible to determine whether or not it is in the state of being on the open end side with respect to the central portion.

  Therefore, in the second embodiment, as shown in FIG. 9, the air supply amount adjusting means 63, the fuel gas intermittent means 64, and the control means 65 are provided, and the thermocouple 62 is used in the direction of the tube axis of the combustion chamber N. The temperature in the vicinity of the closed side end of the combustion chamber N is measured, and if the measured temperature is equal to or higher than a preset temperature (corresponding to the third set temperature), the closed side end in the tube axis direction of the combustion chamber N When the amount of air introduced into the part is increased and the amount of air reaches the upper limit value, the supply of the fuel gas to the combustion chamber N is stopped to stop the combustion. Here, the set temperature (corresponding to the third set temperature) is determined to be a temperature at which it can be determined by experiments or the like that the flame in the combustion chamber is located close to the closed end in the tube axis direction. For example, it can be set to 500 to 600 ° C. Further, regarding the increase in the air amount, every time the temperature measured by the thermocouple 62 becomes equal to or higher than the set temperature, the air amount introduced into the closed side end portion in the tube axis direction of the combustion chamber N by a preset increase set amount. Try to increase.

  In this way, if the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber N is equal to or higher than a preset temperature, the amount of air introduced into the closed end in the tube axis direction of the combustion chamber N is reduced. By increasing the position, the flame forming position is separated from the closed end in the tube axis direction of the combustion chamber N (for example, the open end side of the center of the combustion chamber N in the tube axis direction of the combustion chamber N). It is possible to prevent overheating at the closed end of the combustion chamber N in the tube axis direction and to suppress combustion noise. Moreover, even if the amount of air introduced into the closed end of the combustion chamber N in the tube axis direction reaches the upper limit, and the increase in the amount of air cannot cope, the supply of fuel gas to the combustion chamber N is stopped. By stopping the combustion, it is possible to reliably prevent overheating at the closed end of the combustion chamber N in the tube axis direction and suppress combustion noise.

In the second embodiment, the air supply amount adjusting means 63 is configured to be able to adjust the supply amount of air supplied to the air chamber 20, for example, a blower fan or a supply pipe for supplying air to the air chamber 20. The air supply amount adjustment means 63 can be configured by a flow rate adjustment valve that can adjust the flow rate of air at. The control means 65 adjusts the rotational speed of the blower fan and the opening of the flow rate adjustment valve to increase the amount of air supplied to the air chamber 20, thereby closing the end of the combustion chamber N in the tube axis direction. In addition to the amount of air introduced into the combustion chamber N, the amount of air introduced into the entire combustion chamber N is also increased.
The fuel gas interrupting means 64 is configured to be able to intermittently supply the fuel gas supplied to the gas chamber 30. For example, the fuel gas interrupting means 64 is configured by an on-off valve that can open and close a supply pipe that supplies the fuel gas to the gas chamber 30. Can be configured. For example, when the rotational speed of the blower fan is adjusted to increase the amount of air supplied to the air chamber 20, when the rotational speed of the blower fan reaches the upper limit value, the combustion chamber N It is determined that the amount of air supplied to the closed end in the tube axis direction has reached the upper limit, and the combustion is stopped by closing the on-off valve and stopping the supply of fuel gas to the gas chamber 30 I am letting.

[Third Embodiment]
This third embodiment is another embodiment of the control for preventing overheating at the closed end in the tube axis direction of the combustion chamber N and suppressing combustion noise in the second embodiment. . Since other configurations are the same as those of the first and second embodiments, only different points of control will be described.

In the second embodiment, as shown in FIG. 9, the thermocouple 62 measures the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber N, and the measured temperature is set in advance. If the temperature is higher than the temperature, the amount of air introduced into the closed end of the combustion chamber N in the tube axis direction is increased, and when the amount of air reaches the upper limit, the supply of fuel gas to the combustion chamber N is stopped. Thus, the control for stopping the combustion is performed.
On the other hand, in the third embodiment, as shown in FIG. 11, the air supply amount adjusting means 63 and the control means 65 are provided, and the closed end in the tube axis direction of the combustion chamber N is provided by the thermocouple 62. The temperature in the vicinity of the section is measured, and control is performed to increase or decrease the amount of air introduced into the closed end in the tube axis direction of the combustion chamber N so that the measured temperature is within a preset setting range. It is configured as follows. Here, with respect to the set range, a position where the flame formation position is separated from the closed end in the tube axis direction of the combustion chamber (for example, an open end relative to the center portion of the combustion chamber in the tube axis direction of the combustion chamber) It can be set to a temperature range that can be determined as being in a state of being (side), for example, can be set to a range of 250 to 300 ° C.

  When the measured temperature measured by the thermocouple 62 is higher than the set range, the control means 65 increases the amount of air introduced into the closed end of the combustion chamber N in the tube axis direction, and measured by the thermocouple 62. When the measured temperature is lower than the set range, the operation of the air supply amount adjusting means 63 is controlled so as to reduce the amount of air introduced into the closed end of the combustion chamber N in the tube axis direction. As with the second embodiment, the air supply amount adjusting means 63 may be constituted by a blower fan or a flow rate adjusting valve that can adjust the flow rate of air in a supply pipe that supplies air to the air chamber 20. it can. The control means 65 adjusts the amount of air supplied to the air chamber 20 by adjusting the rotational speed of the blower fan and the opening of the flow rate adjusting valve, thereby supplying the closed end of the combustion chamber N in the tube axis direction. The amount of air introduced into the entire combustion chamber N as well as the amount of air to be adjusted is adjusted. In the third embodiment, the fuel gas intermittent means 64 can be omitted.

[Another embodiment]
Next, another embodiment of the tubular flame burner of the present invention will be described.
(A) In the first to third embodiments, in order to introduce air to the closed end side of the combustion chamber N, the gas-side through hole 20b is provided in the air orifice 21. Without being limited thereto, as shown in FIG. 12, in addition to the gas side through hole 20b, another through hole 21c may be provided on the closed end side of the four through holes 21h.
Moreover, it is good also as a structure which does not provide the gas side through-hole 20b of the air orifice 21, but provides the through-hole 21c.

(B) In the first to third embodiments, the air introduced into the closed end side in the tube axis direction of the combustion chamber N or the air introduced into the open end side is a gas slit in a state of being mixed with the fuel gas. However, the present invention is not limited to such a configuration, and the air slit 22s or the gas slit is provided on the closed end side in the tube axis direction in the combustion chamber N or on the open end side. An inlet that is independent of 32s may be provided, and a predetermined amount of air or a lean air-fuel mixture having a combustion limit concentration or less may be eccentrically introduced into the combustion chamber N therefrom.
Further, instead of the above configuration, an introduction hole is provided in the end plate 40 or the first end plate 60, and a predetermined amount of air or a lean mixture having a combustion limit concentration or less is passed through the introduction hole to the closed end side in the tube axis direction. It is also possible to introduce it toward.
Here, in the case where a lean air-fuel mixture having a combustion limit concentration or less is introduced into the closed end of the combustion chamber N in the tube axis direction, the closed side of the combustion chamber N in the tube axis direction is used in the second and third embodiments. Instead of the amount of air introduced into the end, the amount of lean air-fuel mixture introduced into the closed end of the combustion chamber N in the tube axis direction is adjusted.

(C) In the first to third embodiments, the air orifice 21 adjusts the ratio of the amount of air ejected from the air slit 22s and the gas slit 32s. For example, the air supply pipe is divided into three parts, that is, a combustion air supply pipe, a combustion chamber closing wall cooling air supply pipe, and a combustion chamber open end cooling air supply pipe. You may comprise so that combustion chamber obstruction | occlusion wall cooling air and combustion chamber open end cooling air may be supplied. For each air amount, the combustion air is less than the amount calculated from the set air ratio, the closed wall cooling air amount allows the flame to be formed at a position away from the wall, and the wall temperature to be below a predetermined value. The minimum amount to be maintained and the combustion chamber open end cooling air amount are set to a flow rate that is lower than the heat resistance temperature of the open end material and at the same time keeps the flame in a predetermined position. Since the overall air ratio of combustion is determined from these total flow rates, the amount of combustion air supplied through the combustion air supply pipe is determined from the air amount calculated from the set air ratio, at both ends of the combustion chamber N, that is, the combustion chamber blocking wall. The amount of air supplied from the cooling air supply pipe and the combustion chamber open end cooling air supply pipe is reduced.

(D) In the first to third embodiments, the air slit 22s and the gas slit 32s are configured to include the partition walls 22k and 32k that subdivide them, but the configuration is limited to such a configuration. However, it is possible to adopt a configuration without the partition walls 22k and 32k. At this time, an amount of air proportional to the gas side through large hole 21a and the gas side through small hole 21b in the air orifice 21 is supplied to the open end side and the closed end side of the gas slit 32s. As a result, the air-fuel mixture is diluted.

(E) In the first to third embodiments, air is introduced from the air slit 22s and the air-fuel mixture of the fuel gas and air is introduced into the combustion chamber N from the gas slit 32s separately to cause the swirl combustion. However, the present invention is not limited to such a configuration. For example, only the air-fuel mixture obtained by mixing air and fuel gas in advance may be eccentrically introduced into the combustion chamber N and swirled and burned. . In this case, the concentration of the air-fuel mixture introduced into the closed end portion in the tube axis direction in the combustion chamber N is set to the combustion limit concentration or less, and the concentration of the air-fuel mixture introduced in the vicinity of the opening 50h in the tube axis direction of the combustion chamber N Is set to be lower than the average mixture concentration introduced into the combustion chamber N.
Further, the present invention is not limited to the above-described configuration, and air, fuel gas, and a mixture thereof may be separately introduced into the combustion chamber N and swirled and burned. In this case, the configuration is such that air or a lean air-fuel mixture having a concentration equal to or lower than the combustion limit concentration is introduced into the closed end of the combustion chamber N in the tube axis direction. The flow rate per unit area of air introduced in the vicinity is made larger than the average air flow rate per unit area of air introduced into the combustion chamber N at the closed end side in the tube axis direction, or the combustion chamber N The concentration of the air-fuel mixture introduced near the opening 50h in the tube axis direction is set to be lower than the average air-fuel mixture concentration of the air-fuel mixture introduced into the combustion chamber N.

(F) In the first to third embodiments, the opening 50h of the front flange 50 is formed in a circular shape, but the opening 50h may be formed in a polygonal shape other than a circle. However, also in this case, each apex is positioned on the cylinder inner side of the peripheral wall of the combustion chamber N, and the area of the opening 50h is configured to be smaller than the area of the combustion chamber N in a sectional view as a whole. Shall.

(G) In the second embodiment, when the amount of air introduced into the closed end of the firing chamber N in the tube axis direction is increased, and when the amount of air reaches the upper limit, Although both the control of stopping the supply of the fuel gas and stopping the combustion are performed, it is also possible to perform only one of the controls.
That is, the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber N is measured by the thermocouple 62, and if the measured temperature is equal to or higher than a preset first set temperature, Control can be performed to increase the amount of air introduced to the closed end in the tube axis direction. Here, the first preset temperature can be the same temperature as the third preset temperature or a different temperature.
Alternatively, the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber N is measured by the thermocouple 62, and if the measured temperature is equal to or higher than a preset second set temperature, the combustion chamber N is returned to. It is also possible to perform control to stop the combustion by stopping the supply of the fuel gas. Here, about the 2nd preset temperature, it can be set as the same temperature as the above-mentioned 3rd preset temperature, or a different temperature.

(H) In the second and third embodiments, when performing control to increase the amount of air introduced into the closed side end of the combustion chamber N in the tube axis direction, the closed side end of the combustion chamber N in the tube axis direction In addition to increasing the amount of air introduced into the combustion chamber N, the amount of air introduced into the entire combustion chamber N is also increased, but it is also possible to increase only the amount of air introduced into the closed end of the combustion chamber N in the tube axis direction. it can.

(I) In the second and third embodiments, the thermocouple 62 measures the temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber N. However, instead of the thermocouple, a gas sensor ( For example, a CO ₂ sensor or an O ₂ sensor) can be applied.

The present invention effectively suppresses deformation and burnout due to overheating of the closed end wall in the one-end closed tubular flame burner, and contributes to a compact configuration of the burner. In addition, the flame formation position can be controlled, which is useful for stable operation.
According to the present invention, since the entire one-end closed tubular flame burner can be kept at a low temperature, it can be mounted in a compact manner while coexisting with electronic components inside the casing of the combustion equipment, and can be used for commercial and household combustion. It has high utility value for application to equipment.

20 Air chamber 20a Air supply opening 21 Air orifice 21a Gas side through hole 21b Gas side through hole 21h Through hole 22 Air slit forming member 22h Through hole 22s Air slit 32 Gas slit forming member 32s Gas slit 40 End plate 50 Front flange 50h Opening

Claims (8)

From the slit opened along the tube axis direction of the cylindrical combustion chamber whose one end is closed and the other end is opened toward the combustion chamber, the fuel gas and the air are supplied to the combustion chamber. A one-end closed tubular flame burner that swirls and burns an air-fuel mixture or a mixture of fuel gas and air and a mixture of fuel gas and air eccentrically,
It is configured to introduce air or a lean air-fuel mixture having a combustion limit concentration or less into the closed end portion in the tube axis direction in the combustion chamber ,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and when the measured temperature is equal to or higher than a preset first set temperature, the closed end in the tube axis direction of the combustion chamber One end closed type tubular flame burner configured to perform control to increase the amount of air introduced into the section or the amount of lean mixture below the combustion limit concentration . From the slit opened along the tube axis direction of the cylindrical combustion chamber whose one end is closed and the other end is opened toward the combustion chamber, the fuel gas and the air are supplied to the combustion chamber. A one-end closed tubular flame burner that swirls and burns an air-fuel mixture or a mixture of fuel gas and air and a mixture of fuel gas and air eccentrically,
It is configured to introduce air or a lean air-fuel mixture having a combustion limit concentration or less into the closed end portion in the tube axis direction in the combustion chamber,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and when the measured temperature is equal to or higher than a preset second set temperature, the supply of fuel gas to the combustion chamber is stopped. And a one-end closed tubular flame burner configured to perform control to stop combustion . From the slit opened along the tube axis direction of the cylindrical combustion chamber whose one end is closed and the other end is opened toward the combustion chamber, the fuel gas and the air are supplied to the combustion chamber. A one-end closed tubular flame burner that swirls and burns an air-fuel mixture or a mixture of fuel gas and air and a mixture of fuel gas and air eccentrically,
It is configured to introduce air or a lean air-fuel mixture having a combustion limit concentration or less into the closed end portion in the tube axis direction in the combustion chamber,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and when the measured temperature is equal to or higher than a preset third set temperature, the closed end in the tube axis direction of the combustion chamber When the amount of air or lean mixture below the combustion limit concentration is increased and the air amount or lean mixture reaches the upper limit, the supply of fuel gas to the combustion chamber is stopped. A one-end closed tubular flame burner configured to control to stop combustion . From the slit opened along the tube axis direction of the cylindrical combustion chamber whose one end is closed and the other end is opened toward the combustion chamber, the fuel gas and the air are supplied to the combustion chamber. A one-end closed tubular flame burner that swirls and burns an air-fuel mixture or a mixture of fuel gas and air and a mixture of fuel gas and air eccentrically,
It is configured to introduce air or a lean air-fuel mixture having a combustion limit concentration or less into the closed end portion in the tube axis direction in the combustion chamber,
The temperature in the vicinity of the closed end in the tube axis direction of the combustion chamber is measured, and the closed end in the tube axis direction of the combustion chamber is set so that the measured temperature is within a preset setting range. One-end closed tubular flame burner configured to increase or decrease the amount of air introduced into the fuel or the amount of lean air-fuel mixture below the combustion limit concentration . 5. The one-end closed tubular flame burner according to claim 1, wherein the air or the lean air-fuel mixture introduced into the closed end is introduced in the same direction as the swirl direction of the swirl combustion . The flow rate per unit area of the air introduced in the vicinity of the opening in the tube axis direction in the combustion chamber is an average air per unit area of the air introduced into the combustion chamber on the closed end side in the tube axis direction. It is set so that the concentration of the air-fuel mixture introduced in the vicinity of the opening in the tube axis direction in the combustion chamber is lower than the average air-fuel mixture concentration of the air-fuel mixture introduced into the combustion chamber. one end closed tubular flame burner according to any one of claims 1 to 5 are. The one-end closed tubular flame burner according to any one of claims 1 to 6 , wherein an area of the opening of the combustion chamber is smaller than an area in a sectional view of the combustion chamber . The upstream end portion of the air introduction range eccentrically introduced into the combustion chamber by the slit burns more than the upstream end portion of the fuel gas introduction range eccentrically introduced into the combustion chamber by the slit. The one-end closed tubular flame burner according to any one of claims 1 to 7 , which is set to be upstream of the chamber in the tube axis direction .

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