JP3606501B2 - Gas combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a burner device for gasifying or burning gas fuel or liquid fuel, and relates to a technique for achieving high load combustion, improving heat utilization efficiency and improving the atmospheric environment, and obtaining versatility. Is.
[0002]
[Prior art]
Conventionally, this kind of gas burner is completely mixed with 40 to 70% of the amount of air necessary for burning the gas as the primary air and mixed with the fuel gas, and is brought into contact with the surrounding air, that is, the secondary air when burned in the burner flame opening. A so-called Bunsen-type combustion burner having a combustion form has been generally used. A burner for all primary air combustion in which all air necessary for combustion is previously mixed with fuel gas, and this mixed gas is sent to the flame opening of the burner for combustion is also well known. In addition, it is compulsory by the so-called red fire type burner that burns only by the air around the flame without using any primary air, or the semi-Bunsen type burner and blower that burns between the Bunsen type and the red fire type. There are also blast burners that cause high-load combustion. In these known burners, there are restrictions on the shape of the flame opening, and there are certain design conditions for the size of the combustion part and the exhaust passage form for complete combustion of the gas. In many cases, it is difficult to effectively provide combustion heat to a heat transfer section shape.
[0003]
In recent years, the need to improve the atmosphere environment and save energy has increased, and in gas combustion equipment such as water heaters, the use of all primary air combustion burners and the so-called light and shade to change the amount of air to fuel for each part of the burner Although research on combustion systems has been conducted and some of them have been put into practical use and the effect on the purpose is recognized, on the other hand, all of them only cause loss of versatility in the form of the burner or cause high costs.
[0004]
[Problems to be solved by the invention]
In the present invention, since the conventional burner has the above-mentioned problems, it solves those drawbacks, realizes high-load combustion applicable to various forms of the object to be heated, and uses the heat efficiently. It is an object of the present invention to provide a technique for improving generality and reducing atmospheric environmental pollutants such as nitrogen oxides in combustion exhaust gas and obtaining versatility.
[0005]
Therefore, in the all-primary-air combustion burner in which all the air necessary for combustion is mixed with the fuel gas in advance, and this mixed gas is sent to the flame outlet of the burner and burned, the exhausted completely burned can be achieved with a relatively simple configuration. An object of the present invention is to develop a technique for achieving the above object by setting the arrangement of the jet outlets in accordance with the shape of the heat transfer portion of the object to be heated.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 is a so-called forced combustion type all-primary air premixed combustion in which all the air necessary for gas combustion is mixed and the mixed gas is supplied to the burner using a blower and burned. In the burner, the burner's flame mouth has a number of small holes or slits or a combination of small holes and slits, and the high-temperature combustion exhaust completely burned at the flame mouth has a substantially constant distance from the surface of the object to be heated. It is configured to be discharged to the outside air through a bag-like exhaust reservoir provided with a number of jets that collide almost at right angles, and the burner flame is horizontal or downward from the horizontal when exiting the flame outlet The burner part is configured so that the total area of the outlets provided in the exhaust reservoir is set to be smaller than the total area of the flame port forming the burner flame , and for exhausting the exhaust The pressure in the exhaust pool Also is for a gas combustion apparatus, wherein a mixed gas was constructed as pressure pumping tube supplied to the burner is increased.
[0007]
According to the second aspect of the present invention, when the water vapor in the exhaust gas condensed on the surface of the object to be heated becomes water droplets and drops into the bag-shaped exhaust reservoir through the ejection port, this water is temporarily removed from the lower portion of the exhaust reservoir. The gas combustion apparatus according to claim 1, wherein a water storage part for storing the gas in a gas generator and evaporating it at the time of combustion of the burner is provided at a position below the flame opening of the burner.
[0008]
According to a third aspect of the present invention, in order to prevent the bag-like exhaust reservoir from being ignited explosively in the exhaust reservoir and damaging the device when an ignition delay to the burner occurs, a part of the exhaust reservoir is provided. The gas combustion apparatus according to claim 1 or 2, wherein an opening is provided and a damper for closing the opening is pressed against the opening from the outside of the exhaust reservoir by a spring. belongs to.
[0009]
In the invention of claim 4, when the water vapor in the exhaust gas condensed on the surface of the object to be heated becomes water droplets and drops into the bag-shaped exhaust reservoir through the jet nozzle, the water does not have to pass through the jet nozzle or the burner. Evaporation object using capillary action such as unglazed or high-density fiber is attached so that one side is in contact with the outside air and the opening provided in a part of the exhaust reservoir is closed so that it can be released to the outside air. The gas combustion apparatus according to claims 1, 2, and 3 is characterized.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, in the figure showing one embodiment of the present invention, the combustion gas is supplied from the gas introduction pipe 1 via the mechanism 2 that controls the pressure and supply amount of the gas. Is supplied by a gas supply pipe 4 to the suction side of a blower 3 for mixing and pressure-feeding, and mixed with air necessary and sufficient for combustion by the blower, passes through a pressure-feed pipe 5 for mixed gas, and passes through a distributed rectifier 6. It reaches burner 7.
The distributed rectifier, which improves the distribution of the mixed gas and controls the rectification action, is usually composed of a metal plate or a metal mesh having a large number of small holes, and is designed in a most desirable form depending on conditions such as the shape of the burner part and the flow velocity of the mixed gas. The size and distribution of the small holes are set so as to help prevent the burner from being backfired, and it is connected to the mixed gas pressure feed pipe 5 in heat transfer or through this to obtain a heat dissipation effect. It is also effective for prevention.
[0011]
In the burner 7, the gas mixture is ignited by the igniter 8, but since the ratio of air to fuel gas in the gas mixture is previously controlled by the electronic control device 9 so that the flame is shortened, the short flame that completes the combustion in a short time And the generation of harmful nitrogen oxides is suppressed.
The high-temperature combustion exhaust gas completely burned by the burner is provided with the above-described combustion exhaust gas at a substantially constant interval with respect to the shape of the heat absorption surface 10 of the object to be heated (in the embodiment shown in the figure, the heat exchange part of the hot water boiler). Are discharged from the exhaust passage 13 to the outside air through the spout 11 from a bag-like exhaust sump 12 provided with a large number of spouts 11 that collide substantially at right angles.
Since the combustion exhaust is already after complete combustion, the distance between the endothermic surface and the jet outlet can be made extremely short, and the combustion calorific value of the gas can be controlled and reduced from the maximum. Heat can be effectively transferred to the object to be heated.
[0012]
As described above, the jet outlet 11 has a form in which high-temperature exhaust collides with the heat-absorbing surface of the object to be heated in a needle shape, so that the heat-insulating boundary thin film of air existing on the heat-transfer surface is destroyed. Provides strong heat transfer performance. Furthermore, since it is easy to design the outer shape of the bag-like exhaust reservoir 12 according to the shape of the heat absorbing surface, it is possible to obtain heat transfer that is highly effective over a wide range of the heat absorbing surface.
[0013]
Ejection speed of the hot exhaust from the jet outlet must be a sufficient speed the destruction of heat-insulating boundary film of air above, therefore the pressure in the exhaust reservoir 12 is set so as to meet that purpose, injection If the total area of the outlet is large, it is necessary to correspondingly increase the pressure in the exhaust pool, which causes a problem in the combustion of the burner. Therefore, the total area of the outlet is at least the total of the nozzles that form the burner flame. The pressure should be set to be smaller than the area, and in order to continue good combustion, the pressure in the pumping pipe for pumping the mixed gas is set higher than the pressure in the exhaust reservoir.
[0014]
It should be noted that the flame formed by the burner 7 is horizontally or downwardly directed to be horizontal in order to eliminate the possibility of condensed water in the exhaust gas adhering to the heat absorbing surface of the object to be heated dripping and closing the flame opening. The angle of the surface 7 is set.
[0015]
In the figure, 14 is a sensor for a flame misfire safety device, 15 is a sensor for detecting the state of combustion exhaust and controlling the mixing ratio of air and fuel to a desired ratio, and 16 is for detecting the hot water temperature in the hot water boiler body 17. These sensors are for controlling the amount of gas and the amount of blown air via the electronic control unit 9.
[0016]
According to the invention of claim 2, the water reservoir 18 is provided at a position below the flame outlet of the burner at a part of the bottom of the exhaust reservoir 12, and condensation of water vapor in the exhaust adhering to the heat absorption surface of the heated object is performed. In order to avoid the influence on the burner when water enters the exhaust reservoir 12 through the jet port 11, a configuration is provided in which the water is once retained in the water storage section and evaporated by the combustion hot air from the burner.
[0017]
According to the invention of claim 3, the opening 19 is provided in a part of the exhaust reservoir 12, and the damper 20 that hermetically closes the opening is pressed against the opening 19 from the outside of the exhaust reservoir by the spring. If the ignition delay to the burner occurs and it is ignited explosively, the damper 20 is opened and the pressure is released to prevent the exhaust reservoir and other components from being damaged.
[0018]
According to the invention of claim 4, when condensed water of water vapor in the exhaust adhering to the heat absorption surface of the object to be heated enters the exhaust reservoir 12 through the jet outlet 11, this water is naturally evaporated. An evaporating object 22 using capillarity such as unglazed or high-density fiber is installed in a state in which the opening 21 is closed in such a manner that one side is in contact with the outside air in an opening 21 provided in a part of the reservoir. The structure characterized by this is provided.
[0019]
In the drawings showing the embodiment, reference numeral 23 indicates a state of high-temperature exhaust gas ejected from the outlet 11, reference numeral 24 indicates a water supply pipe to the hot water boiler, and reference numeral 25 indicates a hot water discharge pipe. Further, 26 and 27 are heat insulating materials for preventing the heat release of the exhaust reservoir, but there are cases where they are attached to the outer surface of the exhaust reservoir, unlike the figure. Reference numeral 28 denotes the state of the flame formed by the burner.
[0020]
Since the present invention relates to the treatment of fuel gas and exhaust as described above, the present invention is not limited to the form shown in the embodiments. For example, the object to be heated may be gas, oil, or a solid object. It can also be applied to gas equipment where the shape of objects changes slightly. In the case of a stove, it is possible to reduce the gap between the endothermic surface of the object to be heated and the jet part of the high-temperature exhaust, which is one of the features of the present invention. There is also an effect that the space height to the object to be heated can be saved.
[0021]
【The invention's effect】
The present invention is implemented in the form as described above, and has the effects described below.
[0022]
Fuel gas and air necessary and sufficient for combustion are mixed in advance, the combustion of the burner is electronically controlled to the most desirable state, and forced combustion is performed using a blower, so that high-load combustion is realized. In addition, short flame combustion of the burner is maintained by electronic control of the air-fuel ratio, and the time for the flame and combustion exhaust to come into contact with air is shortened, so that generation of harmful nitrogen oxides can be suppressed.
[0023]
In addition to setting the position of the hot exhaust outlet for effective heat transfer with respect to the various heat transfer surface forms of the object to be heated, the jet speed and form of the hot exhaust also suit the purpose. Compared to the conventional method of heating directly with a burner, heat transfer can be greatly improved, heat utilization efficiency is increased, energy saving effect is achieved, and the total carbon dioxide generation effect is suppressed. .
[0024]
Since the apparatus can be designed to be relatively compact and the shape of the heat exchanger for the object to be heated can be simplified, it can be manufactured in a wide range of applications and at a relatively low cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment in which a combustion apparatus of the present invention is used for heating a hot water boiler.
2 is a plan view of an AA cross section in the configuration of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gas introduction pipe 2 Mechanism which controls gas pressure and supply amount 3 Blower 4 Gas supply pipe 5 Pressure feed pipe 6 Distribution rectifier 7 Burner 8 Igniter 9 Electronic control device 10 Endothermic surface 11 of heated object 11 Outlet 12 Exhaust reservoir 13 Exhaust Passage 20 Damper 22 Evaporating object 23 High-temperature exhaust ejection state 26, 27 Insulation 28 State of flame formed by burner

Claims (1)

In a so-called forced-combustion all-primary-air premixed combustion burner that mixes all of the air required for gas combustion and supplies the gas mixture to the burner using a blower and burns it, the burner flame outlet has a number of small holes or slits or small holes The high-temperature combustion exhaust that has been completely burned at the flame port has a number of spouts that collide almost at right angles with the surface of the object to be heated. was through the reservoir bag-like exhaust a structure that is released to the outside air, the burner flame is upon exiting the burner ports constitute the burner portion so as to form downwardly from the horizontal, or horizontal, the reservoir exhaust The total area of the provided jet outlet is set to be smaller than the total area of the flame mouth forming the flame of the burner, and the mixed gas is supplied to the burner rather than the pressure in the exhaust reservoir for ejecting the exhaust gas. Pressure in the pumping pipe Gas combustion apparatus, characterized by being configured so increases.

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