A honeycomb matrix plate type ultra-low nitrogen gas burner

Abstract

The application discloses a honeycomb matrix plate type ultra-low nitrogen gas burner, which comprises a burner head, a gas pipeline connected with the burner head and an air channel connected with the burner head; the burner head comprises a gas bin and an air bin, one end of the air bin is connected with the air channel, one end of the gas bin is connected with the gas pipeline, and a distribution cover is arranged on the burning end of the burner head and connected with the gas bin and the air bin; a combustion nozzle and an ignition port are arranged on the distribution cover, the combustion nozzle is distributed in a honeycomb shape on the distribution cover, and the ignition port is at least provided with two and is staggered with the combustion nozzle; the honeycomb matrix plate type ultra-low nitrogen gas burner can realize multi-point combustion, multi-point cross ignition and low nitrogen emission.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of burners, and particularly relates to a honeycomb matrix plate type ultra-low nitrogen gas burner. BACKGROUND

[0002] The basic structure of the prior art gas burner includes a burner head, a combustion nozzle opened on the burner head, and an inner cavity of the burner head connected with a gas supply pipe. The burner head is provided with various combustion nozzles to form variously configured burner heads.

[0003] In order to achieve sufficient combustion of fuel, the existing burner concentrates combustion in a high-temperature zone, and the flame temperature is high at the combustion position. Such combustion condition is prone to generate NO X With the improvement of environmental protection consciousness and the improvement of emission standards in China, the burner needs to reduce the emission of NO X Therefore, it is an urgent problem to design a burner with low NO X emission.

[0004] In order to solve this problem, a completely premixed combustion appears in the prior art, in which the gas and air are premixed and then sprayed out through the burner nozzle for combustion. Such burner has fast combustion speed, and the combustible mixture is rapidly combusted after being sprayed out of the burner nozzle. The combustion speed is fast, and the amount of excess air used by the gas is less because the air has been premixed with the gas. The combustion high-temperature zone is relatively concentrated, and the combustion temperature is higher than that of the flame combustion. However, in the prior art, because the gas and air need to be premixed, the preheating temperature cannot be too high, and in principle cannot be higher than the ignition temperature of the combustible mixture, which may cause backfire and explosion. The fast combustion speed and the high and concentrated combustion temperature of the premixed burner are prone to cause backfire and explosion.

[0005] In addition, the premixed combustion has fast combustion speed, and the hydrocarbons in the gas cannot be decomposed in time, so that there are fewer free carbon particles in the flame. The flue gas recirculation zone cannot be formed, so that the blackness of the flame is smaller than that of the flame combustion, the flame radiation ability is weaker, the flame path is shorter, and the flame only occupies a part of the flame path. During the combustion process, cold air from the surrounding is easily sucked in to cause combustion interruption. Therefore, the stability of the flame is poor.

[0006] Therefore, it is very important to provide a burner which has sufficient combustion, stable combustion, low nitrogen emission and small damage to the combustion nozzle. SUMMARY

[0007] The present application aims to overcome the shortcomings of the prior art, and provides a honeycomb matrix plate type ultra-low nitrogen gas burner with multi-point combustion, multi-point intersection ignition and low nitrogen emission.

[0008] To achieve the above object, the application discloses a honeycomb matrix plate type ultra-low nitrogen gas burner, which comprises a burner head, a gas pipeline connected with the burner head, and an air channel connected with the burner head.

[0009] Further, the combustion nozzle comprises a combustion nozzle shell which is installed on the distribution cover plate, the combustion nozzle shell is provided with a gas injection hole and an air injection port near one side of the distribution cover plate, and a premixing chamber for gas and air is reserved on the other side of the combustion nozzle shell.

[0010] The premixing chamber for gas and air is reserved on the other side of the combustion nozzle shell which deviates from the distribution cover plate and the air injection port and the gas injection hole.

[0011] Further, the combustion nozzle shell is a hollow cylinder, the inner wall of which is circular, the gas injection hole and the air injection port are arranged in the inner cavity of the combustion nozzle shell, the air injection port is selected as a cyclone tooth, the cyclone tooth is composed of a plurality of cyclone gears, the cyclone gears are distributed in a clockwise direction, and the cyclone gears are circularly distributed on the inner wall of the combustion nozzle shell.

[0012] Further, a through hole is reserved in the center of the air injection port, one end of the through hole is connected with the gas pipeline, and the other end of the through hole is connected with the gas injection hole.

[0013] Further, the gas injection hole comprises a plurality of elongated jet nozzles, the elongated jet nozzles extend from the direction of the gas pipeline on the inner side to the direction of the air injection port on the outer side, are similar to the divergence from the inside to the outside in the form of a spiral, and the spiral rotation direction is reverse, the elongated jet nozzles are perpendicular to the injection direction of the cyclone gears, the elongated jet nozzles are distributed in a counterclockwise direction, gas is sprayed from the elongated jet nozzles, the gas swirling direction of the elongated jet nozzles is the same as the direction of the elongated jet nozzles, and the gas is sprayed in a counterclockwise direction.

[0014] Further, the gas is blown out from each elongated jet nozzle, and is blown out in a thin strip shape from the direction of the air outlet of the gas guide pipe to the outside; the gas wind direction is opposite to the air blowing direction, and is blown out from the inside of the cavity of the burner nozzle shell to the direction of the inner wall of the burner nozzle shell, and the gas of each elongated jet nozzle is blown out simultaneously, forming a rotational flow wind blown out from each angle of the center of the cavity of the burner nozzle shell to the inner wall direction, which is fully mixed with the air rotational flow wind blown in from the outside 360° angle to the center, forming a uniform combustible mixture for sufficient combustion.

[0015] Further, the burner nozzles are distributed in multiple layers in a circular ring shape, the burner nozzles on each circular ring are distributed in a concentric circle shape, and the spacing of the inner layer burner nozzles is smaller than the spacing of the outer layer burner nozzles.

[0016] Further, the burner nozzles are uniformly distributed on each circular ring.

[0017] Compared with the prior art, the beneficial effects of the present application include: the present application effectively controls the generation of NO X by premixing combustion and multi-point combustion structure, and improves the stability of premixing combustion, and improves the ignition success rate, and the burner of the present application can effectively improve the heat energy utilization rate of the gas. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a rear view of the burner of the present application;

[0019] Figure 2 is a front view of the burner of the present application;

[0020] Figure 3 is a sectional view of the burner of the present application;

[0021] Figure 4 is a sectional view of the burner nozzle of the present application;

[0022] Figure 5 is a top view of the burner nozzle of the present application;

[0023] In the figure: ignition mechanism 1; air pipe 2; observation hole 3; burner nozzle 4; burner nozzle shell 405; gas injection hole 404; air outlet 402; premixing chamber 406; cyclone gear 4002; elongated jet nozzle 4004; flame monitoring hole 5; self-recovery explosion-proof door 6; gas bin 7; air bin 8; air passage 9; gas passage 10; distribution cover plate 11; rear cover 12; gas guide pipe 13.

[0024] SPECIFIC IMPLEMENTATION CASE

[0025] The present application will be further described below in combination with the drawings and examples.

[0026] AsFigures 1-5 The honeycomb matrix plate type ultra-low nitrogen gas burner of the present application comprises a burner head and a gas pipeline 10 and an air channel 9 connected to the burner head.

[0027] The combustion nozzles 4 are distributed in a honeycomb pattern on the distribution cover plate 11.

[0028] The combustion nozzles of the present application are distributed in a honeycomb pattern, the gas and air are mixed more completely, the excess oxygen is not more than 1.5, the combustion is multi-point, the temperature at the bottom of the combustion nozzle is much lower than the temperature of the barrel of a conventional burner, the concentrated combustion temperature is changed, the emission of NOX is reduced, at the same time, the temperature of the distribution cover plate 11 caused by multi-point combustion changes the damage to the distribution cover plate 11 caused by concentrated combustion, effectively prolonging the service life of the burner.

[0029] The combustion nozzle 4 comprises a combustion nozzle shell 405, the combustion nozzle shell 405 is installed on the distribution cover plate 11, the combustion nozzle shell 405 is provided with a gas injection hole 404 and an air injection port 402 close to one side of the distribution cover plate 11, the angle of the gas injection hole 404 is perpendicular to the angle of the air injection port 402, the gas and air are fully mixed in the combustion nozzle shell 405, the other side of the combustion nozzle shell 405 deviates from the distribution cover plate 11 and deviates from the air injection port 402 and the gas injection hole 404, and a premixing chamber 406 for gas and air is reserved, the premixing chamber 406 is used for the vertically mixed gas and air to pass out.

[0030] In the present application, the vertical intersection of the directions of the gas injection hole 404 and the air injection port 402 in the combustion nozzle shell 405 realizes the vertical collision of the gas and air, the outer combustion nozzle shell 405 blocks the continuous emission of the gas and air, the gas and air are turned back into the premixing chamber 406 for re-mixing, the vertical setting of the combustion injection hole 404 and the air injection port 402 realizes the first vertical mixing of the gas and air, and then the premixing chamber 406 in the combustion nozzle shell 405 realizes the secondary or multiple mixing of the gas and air, realizing the sufficient premixing of the gas and air.

[0031] In the present application, the combustion nozzle shell 405 is selected as a hollow cylinder, the inner wall of which is circular, the gas injection hole 404 and the air injection hole 402 are arranged in the inner cavity of the combustion nozzle shell 405, the air injection hole 402 is selected as a cyclone tooth, the cyclone tooth is composed of a plurality of cyclone gears 4002, each cyclone gear is distributed in the clockwise direction, and each cyclone gear is attached to the circularly distributed inner wall of the combustion nozzle shell 405; air is blown out of each cyclone gear, the wind direction is from the inner wall of the combustion nozzle shell 405 to the inner cavity, and the air of each cyclone gear is blown out at the same time, forming a rotational flow wind which is blown from each angle of the inner wall of the combustion nozzle shell 405 to the center of the cavity of the combustion nozzle shell 405, and is blown from the outer periphery 360° to the center on the inside.

[0032] The air injection hole 402 has a through hole in the center, one end of which is connected to the gas guide pipe 13, and the other end is connected to the gas injection hole 404.

[0033] The gas injection hole 404 includes a plurality of elongated jet nozzles 4004, which extend from the direction of the gas guide pipe 13 on the inside to the direction of the air injection hole 402 on the outside, in a spiral shape from the inside to the outside, and the spiral rotation direction is counterclockwise, the elongated jet nozzles 4004 are perpendicular to the injection direction of the cyclone gear 4002, each elongated jet nozzle is distributed in the counterclockwise direction, and gas is injected from each elongated jet nozzle, the rotational flow direction of the gas from each elongated jet nozzle is the same as the direction of the elongated jet nozzle, and the rotational flow is injected in the counterclockwise direction.

[0034] The gas is blown out of each elongated jet nozzle 4004, and is blown out in a thin strip shape from the direction of the gas guide pipe 13 to the direction of the air injection hole 402 on the outside; the gas wind direction is opposite to the air blowing direction, and the gas is blown from the inside of the cavity of the combustion nozzle shell 405 to the direction of the inner wall of the combustion nozzle shell 405, and the gas of each elongated jet nozzle 4004 is blown out at the same time, forming a rotational flow wind which is blown from each angle of the inner wall of the cavity of the combustion nozzle shell 405 to the center of the inner wall, and the rotational flow wind direction is opposite to the rotational flow wind direction of the air blown from the outer periphery 360° to the center on the inside, the rotational flow wind direction is opposite, and the gas blowing outward is on the inside, and the air blowing inward is on the outside, so that the gas and the air can be fully mixed to form a uniform combustible mixture, and achieve full combustion.

[0035] The combustion nozzle 4 in the application is oppositely arranged with the air nozzle 402 through the gas injection hole 404, and the gas swirl direction is opposite to the air swirl direction, so that the air and the gas are fully and uniformly mixed, the gas injection hole 404 is an inner cyclone of a cyclone tooth, and the arrangement direction of the separator is the same as the airflow rotation direction of the upstream cyclone separation unit, which is clockwise or counterclockwise. In the structure, the burner head is provided with a plurality of combustion nozzles 4 on the distribution cover plate 11, so that multi-point combustion of the burner is realized, on the one hand, the high-temperature damage caused by concentrated combustion of one combustion nozzle 4 is reduced, and on the other hand, the heat energy generated by combustion of each combustion nozzle is circulated and superimposed, so that the flame radiation capacity of the whole burner head is improved, the stability of the flame is improved, and the stability of combustion is enhanced.

[0036] The combination of multi-point combustion and premixed combustion of gas and air improves the stability of combustion on the basis that the gas sprayed from the combustion nozzle nozzle 401 is more fully combusted, further improves the utilization rate of gas, reduces the generation of nitrogen oxides, and avoids the defects of premixed combustion. The combustion nozzles 4 are distributed in multiple layers in the form of a circular ring, the combustion nozzles 4 on each circular ring are distributed in the form of concentric circles, and the spacing of the inner layer combustion nozzles 4 is smaller than that of the outer layer combustion nozzles.

[0037] In the application, the combustion nozzles 4 are distributed in the form of a circular ring, the spacing of the inner layer combustion nozzles 4 is smaller than that of the outer layer combustion nozzles, and the combustion nozzles 4 are distributed in the form of a radial from the inside to the outside. Such a structure makes the flame temperature gradually decrease from the inside to the outside of the distribution cover plate 11, causes the hot gas flow of the combustion nozzle 4 to flow out from the inside to the outside, and further improves the combustion stability of the combustion nozzle 4 on the outside.

[0038] The combustion nozzles on each circular ring are uniformly distributed, so that the hot gas flow of the combustion nozzle 4 flowing out from the inside to the outside is relatively uniform, and the requirement of stable airflow during combustion can be met.

[0039] In the application, the distribution cover plate 11 is provided with combustion nozzles 4 at each part, so that concentrated combustion on the distribution cover plate 11 is avoided, the temperature of each combustion nozzle is evenly distributed, and the generation of NOx due to concentrated combustion is avoided. X At the same time, the high temperature generated by concentrated combustion does not damage the distribution cover plate 11 as a fire cover plate or other burner head, and the service life of the burner joint is improved.

[0040] The rear end of the distribution cover plate 11 is provided with a rear cover 12, the rear cover 12 is connected with the distribution cover plate 11 to form a shell of the burner head, and a hollow cavity is formed in the inside, the air warehouse 8 is arranged on the side close to the distribution cover plate 11, the air passage 9 is communicated in the middle of the side facing the rear cover 12 to introduce air, and the gas passage 9 is communicated around the outer periphery of the air passage 9 to introduce gas.

[0041] The application forms the casing of the burner head by matching the distribution cover plate 11 and the rear cover 12, the distribution cover plate 11 is provided with a plurality of combustion nozzles 4, one side of the distribution cover plate 11 provides the fire cover for the combustion nozzles 4, and the other side directly contacts the air warehouse 8 to preheat the air and improve the combustion efficiency of the burner. Meanwhile, the gas warehouse 7 is spaced from the distribution cover plate 11 through the gas guide pipe 13 and the air warehouse 8, which improves the safety of the burner. The ignition ports are arranged between the annular rings and are distributed at different positions to form the multi-point cross distribution, in the application, the gas and air sprayed by the gas injection hole 404 and the air injection port 402 are sprayed at multiple angles with the combustion nozzle casing 405, and after spraying, the cross ignition is realized through the multiple ignition ports; the existing single-point ignition mode of the burner is changed, multiple ignition ports are arranged, the multi-point cross ignition is realized, and the ignition efficiency is improved.

[0042] In the application, the middle part of the burner head is provided with the self-recovery explosion-proof door 6, and the head of the whole burner is completely explosion-proof.

[0043] The burner head is also provided with the observation hole 3 and the flame monitoring hole 5, which facilitates the observation of the working condition of the burner.

[0044] Finally, it should be noted that the above enumeration is only the specific embodiment of the application. Apparently, the application is not limited to the above embodiment, and there are many variations. All the variations directly derived or thought from the disclosed content by the ordinary skilled in the art should be considered as the protection scope of the application.

Claims

1. A honeycomb matrix plate-type ultra-low NOx gas burner, comprising a burner head and a gas pipe communicating with the burner head, and an air passage communicating with the burner head; the burner head includes an air chamber and a gas chamber, one end of the air chamber communicating with the air passage, and one end of the gas chamber communicating with the gas pipe, characterized in that: A distribution plate cover is provided at the combustion end of the gas chamber and air chamber leading to the burner head. A burner nozzle and an ignition port are provided on the distribution plate cover. The burner nozzle connects the gas chamber and the air chamber. The burner nozzle is distributed in a honeycomb pattern on the distribution plate cover. At least two ignition ports are provided, which are staggered with the burner nozzle. The burner includes a burner housing, which is mounted on a distribution cover plate. The burner housing has a gas injection hole and an air nozzle on the side near the distribution cover plate. The other side of the burner housing has a premixing chamber for gas and air. The angle at which the gas is ejected from the gas injection hole is perpendicular to the angle at which the air is ejected from the air nozzle, so that the gas and air are fully mixed in the burner housing. The burner housing has a premixed chamber for gas and air reserved on the side opposite to the distribution cover plate and the air nozzle and gas nozzle, so as to realize secondary or multiple mixing between gas and air. The premixed chamber is used for the gas and air to be mixed vertically and then discharged. The burner nozzle is positioned opposite to the air nozzle via gas injection holes, and the gas swirl direction is opposite to the air swirl direction, achieving a thorough and uniform mixture of air and gas. The burners are distributed in multiple rings, with the burners on each ring arranged in concentric circles. The spacing between the inner burners is smaller than that between the outer burners. The flame temperature decreases gradually from the inside to the outside of the distribution cover, causing the hot airflow from the burners to flow out from the inside, which further improves the combustion stability of the outer burners.

2. The honeycomb matrix plate type ultra-low NOx gas burner as described in claim 1, characterized in that: The burner housing is a hollow cylinder with a circular inner wall. The gas injection holes and air injection holes are located inside the burner housing. The air injection hole is a cyclone tooth, which is composed of several cyclone gears. The cyclone gears are distributed in a clockwise direction and are arranged in a circular pattern against the inner wall of the burner housing. Air is blown out from each cyclone gear, with the airflow direction from the inner wall of the burner housing towards the inner cavity. The air from each cyclone tooth blows out simultaneously, forming a swirling airflow that blows from all angles of the inner wall of the burner housing towards the center of the cavity of the burner housing, creating a 360° swirling airflow from the outer periphery towards its center.

3. The honeycomb matrix plate type ultra-low nitrogen gas burner as described in claim 1, characterized in that: A through hole is reserved in the center of the air nozzle, one end of which is connected to the gas conduit and the other end is connected to the gas nozzle.

4. The honeycomb matrix plate type ultra-low NOx gas burner as described in claim 2, characterized in that: The gas nozzle includes several elongated jet nozzles that extend from the inner gas conduit towards the outer air nozzle, forming a spiral-like outward divergence. The spiral rotation direction is reversed. The elongated jet nozzles are perpendicular to the nozzle direction of the cyclone gear. Each elongated jet nozzle is distributed counterclockwise, and gas is ejected from each elongated jet nozzle. The swirling direction of the gas in each elongated jet nozzle is the same as the direction of the elongated jet nozzle, and it is ejected in a counterclockwise swirling direction.

5. The honeycomb matrix plate type ultra-low nitrogen gas burner as described in claim 4, characterized in that: The gas is blown out from each of the elongated jet nozzles, forming a thin strip that flows outward from the gas duct towards the air nozzle. The gas flow direction is opposite to the air flow direction, blowing from the inside of the burner housing cavity towards the inner wall of the burner housing. The gas from each of the elongated jet nozzles blows out simultaneously, forming a swirling airflow that blows from the center of the burner housing cavity towards the inner wall at various angles. This swirling airflow mixes fully with the swirling airflow that blows inward from the outer periphery at a 360° angle towards the center, forming a uniform combustible mixture for complete combustion.

6. The honeycomb matrix plate type ultra-low NOx gas burner as described in claim 1, characterized in that: The mouthpieces are evenly distributed on each ring.

7. The honeycomb matrix plate-type ultra-low NOx gas burner according to any one of claims 1-3, 5, and 6, characterized in that: A rear cover is provided at the rear end of the distribution cover plate. The rear cover is connected to the distribution cover plate to form a hollow cavity. An air chamber is provided on the side of the hollow cavity near the distribution cover plate. Air is introduced into the air chamber through an air channel in the middle of the side facing the rear cover, and gas is introduced into the air chamber through a gas channel around the outer periphery of the air channel.

8. The honeycomb matrix plate-type ultra-low NOx gas burner according to any one of claims 1-3, 5, and 6, characterized in that: The ignition ports are located between the rings and are distributed in different positions to form a multi-point cross distribution; Alternatively, a self-resetting explosion-proof door may be provided in the middle of the burner head; Alternatively, an observation port may be provided at the burner head; Alternatively, the burner head may also be provided with a flame monitoring port.

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