JP6042267B2 - Liquid fuel combustion equipment - Google Patents

Description

  The present invention relates to a liquid fuel combustion apparatus that burns a vaporized gas obtained by vaporizing liquid fuel with a vaporizer using a burner, and more particularly, to a device in which the vaporizer has a heat recovery unit that collects combustion heat from a flame.

  Conventionally, in this type of combustion apparatus, the vaporizer is heated by a heater at the start of combustion, and during combustion, the heat recovery unit heats the vaporizer with the combustion heat recovered from the flame, so that the liquid supplied to the vaporizer Some are configured to generate vaporized gas from fuel. The heat recovery part receives heat from the flame and is disposed so as to face the flame hole part of the burner. Various shapes of the burner have been proposed.

  For example, in Patent Document 1, a partition plate is provided at the upper portion of the mixing tube, and the partition plate is provided with an opening on the side opposite to the suction port of the mixing tube. In addition, a flame hole is formed on the inlet side of the mixing tube across the partition plate, so that the effective overall length of the mixing tube is extended by the distance between the opening end of the partition plate and the end of the burner on the non-nozzle side. Since it plays the same role as the thing, the length of the mixing tube can be shortened, and the combustion apparatus can be miniaturized.

  Further, in Patent Document 2, two flame hole networks having different sizes are provided in the above-described burner, and a flame sensor is disposed in the smaller flame hole network so as to function as a flame hole network for detecting the combustion state. ing.

Japanese Patent Laid-Open No. 06-331107 JP-A-11-006618

  However, since the temperature of the center part of the flame hole part rises due to the flame formed in the flame hole part during combustion, in the burner having a small aspect ratio of the flame hole part as in Patent Document 1, the center of the flame hole part is deformed. It becomes easy to do, and a problem will arise in durability. In addition, since the ratio of the length of the outer circumference to the flame hole area is small, the surface area of the formed flame is reduced, so that the contact area with the secondary air is also reduced, resulting in a longer flame length. .

  In addition, when a plurality of flame hole nets are provided as in Patent Document 2, it is necessary to transfer the flame between the flame hole nets, so that the interval between the flame hole nets cannot be made very wide. When the space between the flame holes becomes narrow, the flames coming out from both flame holes interfere with each other, so that the surface temperature between the flame hole networks rises significantly, and the combustion speed becomes faster than the ejection speed from the flame holes. . As a result, a flashback phenomenon is caused, which may cause deterioration of the combustion state and deterioration of the burner. In addition, there may be a slight difference in the combustion performance of each flamehole network, so the combustion state in the flamehole network for detection of the combustion state detected by the flame sensor and the combustion state in the other flamehole network It is also possible that the exact combustion state cannot be detected.

  An object of the present invention is to provide a liquid fuel combustion apparatus capable of effectively recovering heat while maintaining a stable combustion state.

The present invention is a liquid fuel combustion apparatus including a burner having a flame hole portion in which a flame is formed, and a vaporizer having a heat recovery portion for recovering combustion heat from the flame formed in the flame hole portion. The flame hole portion is composed of a flame forming flame hole portion, a heat recovery flame hole portion communicating with the flame forming flame hole portion and facing the heat recovery portion, and the heat recovery flame hole. The longitudinal direction of the part and the longitudinal direction of the flame forming flame hole part are formed substantially orthogonal to each other, and flame detection means for detecting a combustion state is provided around the flame forming flame hole part. A liquid fuel combustion apparatus characterized by the above.

In addition, the heat recovery section is configured such that the longitudinal direction is perpendicular to the direction in which the vaporized gas is ejected, and the longitudinal direction of the heat recovery section and the longitudinal direction of the heat recovery flame hole are the same direction a liquid fuel combustion apparatus according to claim 1 Symbol mounting characterized.

  By comprising as mentioned above, the heat | fever recovery from a combustion flame can be performed effectively, suppressing generation | occurrence | production of a backfire and maintaining the stable combustion state.

It is a side view which shows arrangement | positioning of the vaporizer | carburetor and burner in the Example of this invention. It is an exploded view of a burner. It is a top view which shows arrangement | positioning of the vaporizer | carburetor and burner in the Example of this invention. It is a figure which shows other embodiment of a flame hole part.

  Embodiments of the present invention that are considered to be suitable will be briefly described by showing the effects of the present invention.

  The present invention relates to a heat recovery type liquid fuel combustion apparatus for recovering combustion heat from a flame, wherein the flame forming flame hole part and the heat recovery flame hole part are connected to form a flame hole part, Flame detection means for detecting the combustion state is disposed in the flame hole.

  Since the flame forming flame hole and the heat recovery flame hole are integrally formed, there is no backfire because the flame does not interfere and cause an increase in the surface temperature between the flame hole networks as in the past. Is suppressed, and the combustion state can be kept good. Further, the flame detection means can accurately detect the combustion state by being arranged in the flame forming flame hole, that is, in the flame hole for main combustion.

  Moreover, the flame hole part was made into the shape which made the longitudinal direction of the flame hole part for heat recovery, and the longitudinal direction of the flame hole part for flame formation substantially orthogonal. Thereby, the ratio of the length of the outer periphery with respect to the area of a flame hole part becomes large, and a flame with a large surface area is formed. That is, since the contact area between the flame and the secondary air is increased, the flame is completely burned and the flame length can be shortened. Furthermore, since the flame detection device can be arranged on the longitudinal side of the flame forming flame hole portion, it is possible to increase the degree of freedom of arrangement, and it can be arranged away from the heat recovery portion, so that heat recovery is possible. The combustion state can be accurately detected without being influenced by the influence of the part on the flame.

  Further, the vaporizer and the burner were arranged so that the longitudinal direction of the heat recovery portion and the longitudinal direction of the heat recovery flame hole portion were the same direction. Thereby, since the whole area of a heat recovery part will be exposed to the flame hole part for heat recovery, heat can be recovered effectively from a flame.

  Hereinafter, a liquid fuel combustion apparatus as an embodiment of the present invention will be described with reference to the drawings. In the following description, X, Y, and Z shown in the figure are used to describe the direction in the positional relationship of the components as “width direction X”, “height direction Y”, and “depth direction Z”.

  FIG. 1 is a side view showing the arrangement of the carburetor 1 and the burner 2 in the combustion apparatus of the present invention, and FIG. 2 is an exploded view of the burner 2. The vaporizer 1 includes a vaporization chamber 10 that vaporizes liquid fuel to be vaporized gas, a heater 11 that heats the vaporization chamber 10, a nozzle portion 12 that ejects vaporized gas generated in the vaporization chamber 10 to the burner 2, and a nozzle portion. The plunger part 13 which opens and closes 12 and the heat recovery part 14 which recovers combustion heat from the flame formed by the burner 2 are provided.

  The burner 2 is inserted between the mixing tube 20 having one end opened to face the nozzle portion 12, the burner top 21 disposed on the upper portion of the mixing tube 20, and the mixing tube 20 and the burner top 21. The partition plate 22 is divided into upper and lower parts, and a partition plate opening 220 is formed on the partition plate 22 on the side opposite to the opening of the mixing tube 20.

  Further, the burner top 21 is provided with a flame hole portion 23 in which a flame is formed, and a crater network 24 for preventing backfire and making the flow of the mixed gas uniform. The flame hole portion 23 may be formed of a net material as shown in the figure, or may be a ceramic substrate provided with a large number of small holes.

  In the vicinity of the flame hole 23, an ignition means 3 for igniting the mixed gas ejected from the flame hole 23 and a flame detection means 4 for detecting the combustion state are provided.

  FIG. 3 is a plan view showing the arrangement of the vaporizer 1 and the burner 2. The flame hole portion 23 includes a heat recovery flame hole portion 231 provided at a position facing the heat recovery portion 14, and a flame formation flame hole portion 230 having one end communicating with the heat recovery flame hole portion 231. The heat recovery flame hole 231 and the flame forming flame hole 230 are integrally molded so that the longitudinal direction thereof is substantially orthogonal. In the present combustion apparatus, the flame hole for main combustion is the flame forming flame hole portion 230, and the heat recovery flame hole portion 231 is a flame hole whose main purpose is to heat the heat recovery portion 14.

  Moreover, since the ratio of the length of the outer periphery with respect to the area of the flame hole part 23 becomes large by making the flame hole part 23 into the above shapes, a flame with a large surface area is formed in the flame hole part 23. That is, since the contact area between the flame and the secondary air is increased, the flame is completely burned and the flame length can be shortened.

  The ignition means 3 and the flame detection means 4 are arranged at appropriate positions around the flame forming flame hole 230 so that the tip is exposed to the flame. Furthermore, since the ignition means 3 and the flame detection means 4 are arranged along the longitudinal direction of the flame forming flame hole portion 230, the distance that can be arranged becomes long and the degree of freedom of arrangement increases. Therefore, even if the place where the ignition means 3 and the flame detection means 4 can be arranged is limited due to the balance with other parts of the combustion apparatus, it can be flexibly dealt with.

  The flame holes 23 may be arranged so that the heat recovery flame holes 231 and the flame formation flame holes 230 communicate with each other and the longitudinal directions thereof are substantially orthogonal, as shown in FIG. In addition to a T shape, an L shape may be used as shown in FIG.

  Next, the operation of the liquid fuel combustion apparatus having the above configuration will be described.

  When the start of combustion is instructed, the heater 11 of the vaporizer 1 is first energized, and the heat generated by the heater 11 raises the temperature of the vaporization chamber 10. The temperature of the vaporizing chamber 10 is detected by a thermistor (not shown). When it is detected that the vaporizing chamber 10 has risen to a temperature at which the liquid fuel can be vaporized, an electromagnetic pump (not shown) is started and the liquid fuel enters the vaporizing chamber 10. To be supplied. The liquid fuel supplied to the vaporization chamber 10 is heated and vaporized to become vaporized gas.

  Then, the plunger part 13 is energized at the same time as the electromagnetic pump is started, and the nozzle part 12 is opened. Then, the vaporized gas generated in the vaporization chamber 10 is ejected from the nozzle portion 12 toward the mixing tube 20 of the burner 2.

  The vaporized gas ejected toward the mixing tube 20 takes in ambient air as primary air due to the ejector effect at the time of the ejection, passes through the partition plate opening 220 and flows into the burner top 21 from the mixing tube 20. During this time, the vaporized gas and the primary air are mixed to form a mixed gas, and this mixed gas is first ejected from the flame forming flame hole 230 located upstream of the flame hole 23 and igniting means. 3 is ignited to form a flame.

  Further, when the mixed gas is sequentially ejected from the upstream of the flame hole portion 23 and reaches the end of the flame forming flame hole portion 230, it is next ejected from the heat recovery flame hole portion 231, and also in the heat recovery flame hole portion 231. A flame is formed. When combustion is started in this manner, the heat recovery unit 14 is exposed to the flame formed by the heat recovery flame hole 231 to recover the combustion heat.

  Since the combustion state is monitored by the flame detection means 4 during combustion, it is necessary to accurately detect the flame state in order to keep the combustion state good.

  Since the heat recovery unit 14 is disposed above the heat recovery flame hole 231, the temperature of the flame decreases or the shape of the heat recovery unit 14 near the heat recovery flame hole 231 decreases when the flame touches the heat recovery unit 14. It will be deformed. Therefore, it is difficult to accurately detect the combustion state in the vicinity of the heat recovery unit 14, and it is desirable to detect the combustion state at a position as far from the heat recovery unit 14 as possible. According to the shape of the present embodiment, the flame detecting means 4 is arranged in the longitudinal direction of the flame forming flame hole portion 230, so that the flame detecting means 4 is arranged upstream of the flame forming flame hole portion 230. The combustion state can be detected at a position farther from the heat recovery unit 14 as the position is closer.

  Then, the combustion heat recovered from the flame by the heat recovery unit 14 is transferred to the vaporization chamber 10 to heat the vaporization chamber 10. The thermistor constantly detects the temperature of the vaporization chamber 10, the energization of the heater 11 is controlled so that the temperature of the vaporization chamber 10 becomes a temperature suitable for vaporization of the liquid fuel, and vaporization is performed by the heat recovered by the heat recovery unit 14. If the chamber 10 is sufficiently heated, the energization to the heater 11 is stopped. Thereby, the power consumption during combustion can be reduced.

  The heat recovery unit 14 of the vaporizer 1 of the present embodiment is formed by extrusion and has a shape that is long in the width direction X. And by arrange | positioning the vaporizer 1 and the burner 2 so that the width direction of the heat recovery part 14 and the longitudinal direction of the flame hole part 231 for heat recovery may correspond, the whole region of the heat recovery part 14 will be exposed to a flame. The heat from the flame can be effectively recovered.

  Note that the heat recovery capability of the vaporizer 1 can be increased or decreased by changing the length of the heat recovery unit 14 in the width direction. If the extrusion process is used, the heat recovery capacity can be adjusted by the extrusion length, so that it is possible to cope with the vaporizers 1 having different vaporization capacities with one extrusion mold, so that the production capacity of the vaporizer 1 is excellent. Demonstrate.

  Furthermore, since the heat recovery unit 14 is long in the width direction X and short in the depth direction Z, the length of the burner 2 in the depth direction Z can be shortened, and the entire depth of the combustion apparatus can be made compact. It can be configured.

DESCRIPTION OF SYMBOLS 1 Vaporizer 2 Burner 4 Flame detection means 14 Heat recovery part 23 Flame hole part 230 Flame formation flame hole part 231 Heat recovery flame hole part

Claims (2)

A liquid fuel combustion apparatus comprising: a burner having a flame hole portion in which a flame is formed; and a vaporizer having a heat recovery portion for recovering combustion heat from the flame formed in the flame hole portion. The part is composed of a flame forming flame hole, and a heat recovery flame hole communicating with the flame forming flame hole and facing the heat recovery part, and the longitudinal direction of the heat recovery flame hole And the longitudinal direction of the flame forming flame hole are formed substantially orthogonal to each other, and flame detecting means for detecting a combustion state is provided around the flame forming flame hole. Liquid fuel combustion device. The heat recovery part is configured so that the longitudinal direction is perpendicular to the direction of jetting the vaporized gas, and the longitudinal direction of the heat recovery part and the longitudinal direction of the heat recovery flame hole part are the same direction. liquid fuel combustion apparatus according to claim 1 Symbol mounting and.

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