CN217604077U - Methanol pyrolysis hydrogen production low-nitrogen burner capable of reducing flame temperature - Google Patents

Abstract

The utility model discloses a methanol pyrolysis hydrogen production low-nitrogen burner capable of reducing flame temperature, which comprises a combustion main cylinder body, wherein a mixed gas chamber is communicated with a combustion chamber; combustion-supporting air is introduced into the mixed gas chamber; an expansion chamber is arranged in the mixed gas chamber, the expansion chamber is respectively communicated with an exhaust port of a vacuum generator through a pipeline, an air supply port of the vacuum generator is communicated with a compressed combustion-supporting air supply source, and a negative pressure port of the vacuum generator is correspondingly arranged at the position of a flue gas outlet; a plurality of U-shaped tubes are arranged in the methanol atomization annular chamber, and the left ends of the U-shaped tubes are communicated with a methanol balancer; a plurality of methanol pyrolysis tubes and a combustible gas annular tube are arranged in the combustion chamber; the combustion chamber is internally provided with an atomized methanol nozzle and an ignition device, and the atomized methanol nozzle and a methanol balancer are connected with a methanol storage through a transmission pipe. The utility model provides a pair of methanol pyrolysis hydrogen production low-nitrogen combustor that can reduce flame temperature can reduce nitrogen oxide's formation.

Description

Methanol pyrolysis hydrogen production low-nitrogen burner capable of reducing flame temperature

Technical Field

The utility model relates to a methyl alcohol combustion apparatus technical field especially relates to a low nitrogen combustor of methyl alcohol pyrolysis hydrogen manufacturing that can reduce flame temperature.

Background

The alcohol-hydrogen fuel is environment-friendly and green energy and does not contain sulfur (CO, HC and NO) _x PM) and combustion products are mainly water vapor and trace nitrogen oxides, residue-free residual liquid, the pollutant emission is lower than that of fuels such as natural gas, diesel oil and the like, and the cleanness is considered to be second to the clean energy of hydrogen.

The high-temperature cracking of the methanol can generate combustible gas of hydrogen and carbon monoxide, and the combustion heat value of the combustible gas is higher than that of the direct combustion of the methanol. Combustible gas and combustion-supporting air are mixed and then directly combusted, and a large amount of nitrogen oxides are easily generated due to high flame temperature. The nitrogen oxides pollute the atmosphere and the environment, so a low-nitrogen combustor for preparing hydrogen by cracking methanol at high temperature needs to be designed to reduce the generation of the nitrogen oxides. The method utilizes the combined action of two modes of flue gas recirculation and staged combustion to reduce the generation of nitrogen oxides.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a methanol pyrolysis hydrogen production low-nitrogen burner that can reduce flame temperature.

In order to realize the purpose, the utility model adopts the following technical scheme:

a methanol pyrolysis hydrogen production low-nitrogen burner capable of reducing flame temperature comprises a combustion main cylinder; the combustion main cylinder is internally divided into a left middle mixed gas chamber, a left outer methanol atomization annular chamber and a right combustion chamber by a partition plate;

the mixed gas chamber is communicated with the combustion chamber; combustion-supporting air is introduced into the mixed gas chamber; an expansion chamber is arranged at the left end in the mixed gas chamber, the right outlet end of the expansion chamber is communicated with the inside of the mixed gas chamber, a plurality of left inlet ends of the expansion chambers are respectively communicated with an exhaust port of a vacuum generator through pipelines, a gas supply port of the vacuum generator is communicated with a compressed combustion-supporting air supply source, and a negative pressure port of the vacuum generator is correspondingly arranged at the outlet position of the right outer wall of the combustion main cylinder;

a plurality of U-shaped pipes are arranged in the methanol atomization annular chamber, the right ends of the U-shaped pipes are communicated with the combustion chamber, the left ends of the U-shaped pipes are respectively communicated with a methanol balancer, and each methanol balancer is connected with a methanol storage through a transmission pipe;

a plurality of methanol pyrolysis tubes and a combustible gas annular tube are arranged in the combustion chamber; one pipe orifice of each methanol pyrolysis pipe is communicated and connected with the left end pipe orifice of the U-shaped pipe, and the other pipe orifice of each methanol pyrolysis pipe is communicated and connected with the inlet end of the combustible gas annular pipe; the left outer wall of the combustible gas annular pipe is attached to the right outer wall of the mixed gas chamber, the combustible gas annular pipe comprises a hollow combustible gas inner annular pipe, a hollow combustible gas outer annular pipe and a plurality of hollow arc-shaped connecting channels, a plurality of arc-shaped connecting channels are arranged between the combustible gas inner annular pipe and the combustible gas outer annular pipe, and through holes which are communicated with one another are formed among the combustible gas inner annular pipe, the combustible gas outer annular pipe and the plurality of arc-shaped connecting channels; a mixed gas outer outlet is reserved among the arc-shaped connecting channels, a mixed gas outer outlet channel is arranged on the inner wall of each mixed gas outer outlet, a mixed gas inner outlet is formed in the center hole of the combustible gas inner ring-shaped pipe, a mixed gas inner outlet channel is arranged on the inner wall of the mixed gas inner outlet, and the mixed gas outer outlet channel and the mixed gas inner outlet channel are communicated with the mixed gas chamber; a plurality of combustible gas inner nozzles communicated with the interior of the combustible gas inner annular tube are arranged on the right outer wall of the combustible gas outer annular tube in the circumferential direction, and are positioned on the outer side of the mixed gas inner outlet channel; one side that the left end was equipped with atomizing methyl alcohol nozzle and atomizing methyl alcohol nozzle in the combustion chamber is equipped with ignition, atomizing methyl alcohol nozzle, ignition all are located the right-hand member of combustible gas ring pipe, atomizing methyl alcohol nozzle is connected with the methyl alcohol memory through transmission pipe.

Preferably, the two side ends of the right outer wall of the combustion main cylinder body are provided with flue gas collectors; the gas inlet pipe end of the flue gas collector is correspondingly arranged at the outlet position of the right outer wall of the combustion main cylinder, and the gas outlet pipe end of the flue gas collector is correspondingly arranged at the position of the negative pressure port of the vacuum generator.

Preferably, a gas cooling device is arranged on the pipeline.

Preferably, each of the methanol balancers has an inverted L-shaped structure.

Preferably, a fan is arranged in the mixed gas chamber; and the transmission pipe, the pipeline and the air inlet pipe of the flue gas collector are respectively provided with a driving pump.

Preferably, the middle part of the mixed gas chamber is conical; the conical middle part of the mixed gas chamber is provided with a plurality of blades at intervals along the inner conical surface.

Preferably, the number of the methanol pyrolysis tubes is 4, and each methanol pyrolysis tube is U-shaped; the U-shaped tube has 4.

Preferably, a plurality of heat insulation plates are arranged on the inner wall of the combustion chamber, and are uniformly distributed outside the methanol pyrolysis tube in the circumferential direction; the surface of each heat insulation plate facing the center of the combustion chamber is subjected to mirror surface treatment.

Preferably, a heat insulation material layer is arranged in the partition plate.

Preferably, the outer cylinder surface of the combustion main cylinder is provided with a temperature and flame collecting and observing port in a penetrating manner, and the temperature and flame collecting and observing port is right opposite to the positions inside the combustible gas body, between the outer nozzle and the ignition device.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) Flue gas recirculation is designed: after the flue gas is mixed with the combustion-supporting air, a part of heat can be taken away by using the inert gas in the flue gas, the oxygen content of the combustion-supporting air is reduced, and the flame temperature is reduced;

(2) Staged combustion is designed: combustible gas ejected from the inner nozzle 20 and the outer nozzle 21 of the combustible gas and combustion air initially flow in a laminar flow state, and at the moment, the combustible gas and the combustion air are only partially mixed at a layering part; the combustible gas sprayed out from the inner nozzle 20 of the combustible gas is firstly burnt, and at the moment, partial oxygen is consumed to form primary combustion; the combustible gas sprayed out of the combustible gas outer nozzle 21 is ignited by primary combustion to form secondary combustion; combustible gas unburnt in the first-stage combustion and the second-stage combustion is completely combusted after being mixed in the rear section, and three-stage combustion is formed; the staged combustion realizes a batch combustion mode, and reduces the combustion speed and the oxygen content, thereby reducing the flame temperature.

Drawings

FIG. 1 is a schematic view of the overall three-dimensional structure of the present invention;

fig. 2 is an overall left side view of the present invention;

FIG. 3 isbase:Sub>A sectional view taken along line A-A in FIG. 2;

fig. 4 is an overall right side view of the present invention;

FIG. 5 is an overall front view of the present invention;

FIG. 6 is a sectional view taken along line B-B of FIG. 5;

FIG. 7 is a front cross-sectional view of the present invention with the fan and drive pump and vanes integrally installed;

FIG. 8 is a schematic view of the internal structure of the present invention;

fig. 9 is a schematic view of the internal structure of the present invention;

fig. 10 is a schematic view of the internal structure of the present invention;

fig. 11 is a right side view of fig. 10.

In the figure: 1. burning the main barrel; 2. a mixed gas chamber; 3. a methanol atomization annular chamber; 4. a combustion chamber; 5. a U-shaped tube; 6. a partition plate; 7. a layer of thermal insulation material; 8. an expansion chamber; 9. a pipeline; 10. a gas cooling device; 11. a vacuum generator; 12. a flue gas collector; 14. a methanol balancer; 15. a conveying pipe; 16. a methanol pyrolysis tube; 17. a combustible gas annular tube; 171. an inner annular combustible gas pipe; 172. a combustible gas external annular tube; 173. an arc-shaped connecting channel; 18. a mixed gas outer outlet channel; 19. an outlet passage in the mixed gas; 20. an inner combustible gas nozzle; 21. a combustible gas outer spout; 22. an atomized methanol nozzle; 23. an ignition device; 24. a methanol storage; 25. a fan; 26. driving the pump; 27. a blade; 28. a heat insulation plate; 29. temperature and flame collection observation port.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in fig. 1-11, a low-nitrogen burner for producing hydrogen by methanol pyrolysis capable of reducing flame temperature comprises a combustion main cylinder 1; the combustion main cylinder body 1 is internally divided into a left middle mixed gas chamber 2, a left outer methanol atomization annular chamber 3 and a right combustion chamber 4 by a partition plate 6. A layer 7 of insulating material is provided within the baffle 6.

The mixed gas chamber 2 is communicated with the combustion chamber 4; combustion-supporting air is introduced into the mixed gas chamber 2; the middle part of the mixed gas chamber 2 is conical; the conical middle portion of the gas mixture chamber 2 is provided with a plurality of vanes 27 at intervals along its inner conical surface. The left end is equipped with expansion chamber 8 in the mist room 2, the right exit end and the inside intercommunication of mist room 2 of expansion chamber 8, the gas vent intercommunication of pipeline 9 and vacuum generator 11 is passed through respectively to the left entry end of a plurality of expansion chamber 8, be equipped with gas cooling device 10 on the pipeline 9, vacuum generator 11's air supply port and compressed combustion-supporting air supply source intercommunication, vacuum generator 11's negative pressure port corresponds the outlet duct end position of locating flue gas collector 12, the both sides end of the right outer wall of the total barrel of burning 1 is equipped with flue gas collector 12, the inlet pipe end of flue gas collector 12 corresponds the right outer wall exit position of locating the total barrel of burning 1. The gas cooling device 10 arranged on the pipeline 9 plays a role in cooling the flue gas to normal temperature.

The right ends of 4U-shaped pipes 5,4 in the methanol atomization annular chamber 3 are communicated with the combustion chamber 4, the left ends of the 4U-shaped pipes 5 are communicated with methanol balancers 14, each methanol balancer 14 is of an inverted L-shaped structure, and each methanol balancer 14 is connected with a methanol storage 24 through a transmission pipe 15.

4 methanol pyrolysis tubes 16 and a combustible gas annular tube 17 are arranged in the combustion chamber 4; each methanol pyrolysis tube 16 is U-shaped, one orifice of each methanol pyrolysis tube 16 is communicated and connected with the left end orifice of the U-shaped tube 5, and the other orifice is communicated and connected with the inlet end of the combustible gas annular tube 17.

The left outer wall of the combustible gas annular pipe 17 is attached to the right end outer wall of the mixed gas chamber 2, the combustible gas annular pipe 17 comprises a hollow combustible gas inner annular pipe 171, a hollow combustible gas outer annular pipe 172 and a plurality of hollow arc connecting channels 173, a plurality of arc connecting channels 173 are arranged between the combustible gas inner annular pipe 171 and the combustible gas outer annular pipe 172, and through holes communicated with each other are formed between the combustible gas inner annular pipe 171, the combustible gas outer annular pipe 172 and the arc connecting channels 173.

The outer outlets of the mixed gas are reserved among the arc-shaped connecting channels 173, the inner wall of each outer outlet of the mixed gas is provided with an outer outlet channel 18 of the mixed gas, the central hole of the inner ring-shaped pipe 171 of the combustible gas forms an inner outlet of the mixed gas, the inner wall of the inner outlet of the mixed gas is provided with an inner outlet channel 19 of the mixed gas, and the outer outlet channel 18 of the mixed gas and the inner outlet channel 19 of the mixed gas are communicated with the mixed gas chamber 2.

The outer wall of the right side of the inner annular tube 171 of the combustible gas is provided with a plurality of inner combustible gas spouts 20 communicated with the inner portion of the inner annular tube 171 of the combustible gas and a plurality of inner combustible gas spouts 20 are positioned at the outer side of the outer outlet channel 19 of the mixed gas, and the outer wall of the right side of the outer annular tube 172 of the combustible gas is provided with a plurality of outer combustible gas spouts 21 communicated with the inner portion of the outer annular tube 172 of the combustible gas and a plurality of outer combustible gas spouts 21 are positioned at the outer side of the outer outlet channel 18 of the mixed gas.

The left end in the combustion chamber 4 is provided with an atomized methanol nozzle 22, one side of the atomized methanol nozzle 22 is provided with an ignition device 23, the atomized methanol nozzle 22 and the ignition device 23 are both positioned at the right end of the combustible gas annular pipe 17, and the atomized methanol nozzle 22 is connected with a methanol storage 24 through a transmission pipe 15.

A plurality of heat insulation plates 28 are arranged on the inner wall of the combustion chamber 4, and the heat insulation plates 28 are uniformly distributed outside the methanol pyrolysis tube 16 in an annular direction; the face of each heat shield 28 facing the center of the combustion chamber 4 is mirror finished.

A fan 25 is arranged in the mixed gas chamber 2; the transmission pipe 15, the pipeline 9 and the air inlet pipe of the flue gas collector 12 are all provided with a driving pump 26.

The outer cylinder surface of the combustion main cylinder 1 is provided with a temperature and flame acquisition observation port 29 in a penetrating way, and the temperature and flame acquisition observation port 29 is right opposite to the positions in the combustible gas and between the outer nozzle and the ignition device 23.

The utility model discloses a theory of operation does:

compressed combustion-supporting air enters the vacuum generator 11 through the air supply port, the vacuum generator 11 generates negative pressure at the negative pressure port, the negative pressure generated by the negative pressure port sucks flue gas and mixes the flue gas with the compressed combustion-supporting air to enter the pipeline 9, and the flue gas and the air are mixed for the first time; the volume of the mixed gas of the flue gas enters the expansion chamber 8 and expands, and the pressure is reduced, at the moment, the flue gas and the air are mixed for the second time, and the air is introduced into the mixed gas chamber 2; then the mixed gas of the flue gas enters the mixed gas chamber 2 through an outlet, and the space is larger, so that the flue gas and the air are mixed for the third time; mixing the flue gas and the air uniformly after the three times of mixing; as the mixed gas continuously enters the mixed gas chamber 2, a stable flow is formed and then flows through a mixed gas inner outlet channel 19 and a mixed gas outer outlet channel 18 formed by the combustible gas annular pipe 17; blades 27 are arranged on the inner conical surface of the mixed gas chamber 2, and the helical blades rotate combustion air in the mixed gas chamber 2 to further accelerate mixing;

starting a driving pump 26 to enable methanol in a methanol storage 24 to flow into an atomized methanol nozzle 22 through a transmission pipe 15, atomizing the methanol by the atomized methanol nozzle 22 and mixing the atomized methanol with a mixed gas of third flue gas and air, simultaneously starting an ignition device 23 to ignite the mixture of the methanol, the flue gas and the air, and starting the heat of the methanol combustion to heat the methanol pyrolysis pipe 16 and the combustion chamber 4; the inner wall of the combustion chamber 4 is provided with the heat insulation plate 28, the surface of the heat insulation plate 28 facing the center is subjected to mirror surface treatment, so that the heat loss can be reduced as much as possible, meanwhile, the mirror surface can reflect heat back and forth in the combustion chamber 4 and heat the methanol pyrolysis tube 16 back and forth from all directions, and the methanol pyrolysis tube 16 is heated more uniformly and temperature rise is quicker;

the fan 25, the driving pump 26 and the ignition device 23 can be electrically connected with a controller and controlled to start through the controller, the controller can be arranged outside the combustion main cylinder 1, and wire passing holes for the fan 25, the driving pump 26 and the ignition device 23 are formed in each plate and wall in the combustion main cylinder 1;

starting the driving pump 26 to make the liquid methanol in the methanol storage 24 flow into the methanol balancer 14 at a low flow rate and a low flow rate through the transmission pipe 15 (the transmission pipe 15 may be provided with a flow regulating valve), and then enter the methanol pyrolysis pipe 16 through the U-shaped pipe 5; because the methanol has low flow velocity and low flow rate, the methanol does not enter the methanol pyrolysis tube 16 in a spraying mode, but slowly flows in the methanol pyrolysis tube 16 along the wall surface with small flow rate, which is to ensure that the methanol is quickly heated to over 800 ℃, and combustible gas hydrogen (H) generated by methanol pyrolysis can be generated at the moment ₂ ) And carbon monoxide (CO) up to 99%, which if the temperature rise is slow, produces carbon dioxide (CO) that is not conducive to combustion ₂ ) And water (H) ₂ O) and the like, which lowers the utilization rate of methanol; the combustible gas generated by cracking enters the combustible gas annular pipe 17 and is sprayed out through the combustible gas inner nozzle 20 and the combustible gas outer nozzle 21;

after the methanol is cracked into combustible gas, the pressure in the methanol pyrolysis tube 16 is increased, the methanol on the right side of the U-shaped tube 5 flows to the left side to increase the liquid level in the methanol balancer 14, meanwhile, the methanol in the methanol storage 24 continuously flows into the methanol balancer 14 to continuously increase the liquid level, the methanol on the left side of the U-shaped tube 5 flows to the right side due to the increase of the liquid level, and the methanol gradually reach dynamic balance, so that the structure can prevent the methanol from flowing back to the methanol storage 24 and is not influenced by the pressure in the methanol pyrolysis tube 16;

when the temperature and flame collection observation port 29 collects that the combustible gas at the combustible gas annular pipe 17 is burnt normally, the atomized methanol nozzle 22 is closed to stop the burning of methanol, and the temperature of the combustible gas at the combustible gas annular pipe 17 is switched to be used for heating the methanol pyrolysis pipe 16.

The scheme reduces the flame temperature to reduce the generation of nitrogen oxides, and combines the following two modes:

(1) Flue gas recirculation: after the flue gas is mixed with the combustion-supporting air, a part of heat can be taken away by using the inert gas in the flue gas, the oxygen content of the combustion-supporting air is reduced, and the flame temperature is reduced;

(2) Staged combustion is set: combustible gas ejected from the inner nozzle 20 and the outer nozzle 21 of the combustible gas and combustion air initially flow in a laminar flow state, and at the moment, the combustible gas and the combustion air are only partially mixed at a layering part; the combustible gas sprayed out from the inner nozzle 20 of the combustible gas is firstly burnt, and at the moment, partial oxygen is consumed to form primary combustion; the combustible gas sprayed out of the combustible gas outer nozzle 21 is ignited by primary combustion to form secondary combustion; combustible gas unburnt in the first-stage combustion and the second-stage combustion is completely combusted after being mixed in the rear section, and three-stage combustion is formed; staged combustion achieves batch combustion mode (not too much amount per combustion), reduces combustion speed and oxygen content, and thus lowers flame temperature, as schematically shown in fig. 7 (dashed arrow).

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims (10)

1. A methanol pyrolysis hydrogen production low-nitrogen burner capable of reducing flame temperature comprises a combustion main cylinder body (1); the device is characterized in that the interior of the combustion main cylinder body (1) is divided into a left middle mixed gas chamber (2), a left outer methanol atomization annular chamber (3) and a right combustion chamber (4) by a partition plate (6);

the mixed gas chamber (2) is communicated with the combustion chamber (4); combustion-supporting air is introduced into the mixed gas chamber (2); an expansion chamber (8) is arranged at the left end in the mixed gas chamber (2), the right outlet end of the expansion chamber (8) is communicated with the inside of the mixed gas chamber (2), a plurality of left inlet ends of the expansion chamber (8) are respectively communicated with an exhaust port of a vacuum generator (11) through pipelines (9), a gas supply port of the vacuum generator (11) is communicated with a compressed combustion-supporting air supply source, and a negative pressure port of the vacuum generator (11) is correspondingly arranged at the outlet position of the right outer wall of the combustion main cylinder body (1);

a plurality of U-shaped pipes (5) are arranged in the methanol atomization annular chamber (3), the right ends of the U-shaped pipes (5) are communicated with the combustion chamber (4), the left ends of the U-shaped pipes (5) are respectively communicated with a methanol balancer (14), and each methanol balancer (14) is connected with a methanol storage (24) through a transmission pipe (15);

a plurality of methanol pyrolysis tubes (16) and a combustible gas annular tube (17) are arranged in the combustion chamber (4); one pipe orifice of each methanol pyrolysis pipe (16) is communicated and connected with the left end pipe orifice of the U-shaped pipe (5), and the other pipe orifice is communicated and connected with the inlet end of the combustible gas annular pipe (17); the left outer wall of the combustible gas annular pipe (17) is connected with the right outer wall of the mixed gas chamber (2) in an attached mode, the combustible gas annular pipe (17) comprises a hollow combustible gas inner annular pipe (171), a hollow combustible gas outer annular pipe (172) and a plurality of hollow arc-shaped connecting channels (173), a plurality of arc-shaped connecting channels (173) are arranged between the combustible gas inner annular pipe (171) and the combustible gas outer annular pipe (172), and mutually communicated through holes are formed among the combustible gas inner annular pipe (171), the combustible gas outer annular pipe (172) and the arc-shaped connecting channels (173); a mixed gas outer outlet is reserved among the arc-shaped connecting channels (173), a mixed gas outer outlet channel (18) is arranged on the inner wall of each mixed gas outer outlet, a mixed gas inner outlet is formed in the center hole of the combustible gas inner annular tube (171), a mixed gas inner outlet channel (19) is arranged on the inner wall of the mixed gas inner outlet, and the mixed gas outer outlet channel (18) and the mixed gas inner outlet channel (19) are communicated with the mixed gas chamber (2); a plurality of combustible gas inner nozzles (20) communicated with the inside of the combustible gas inner annular tube (171) are axially arranged on the right outer wall of the combustible gas inner annular tube (171), the plurality of combustible gas inner nozzles (20) are positioned on the outer side of the mixed gas inner outlet channel (19), a plurality of combustible gas outer nozzles (21) communicated with the inside of the combustible gas outer annular tube (172) are axially arranged on the right outer wall of the combustible gas outer annular tube (172), and the plurality of combustible gas outer nozzles (21) are positioned on the outer side of the mixed gas outer outlet channel (18); one side that the left end was equipped with atomizing methyl alcohol nozzle (22) and atomizing methyl alcohol nozzle (22) in combustion chamber (4) is equipped with ignition (23), atomizing methyl alcohol nozzle (22), ignition (23) all are located the right-hand member of combustible gas ring pipe (17), atomizing methyl alcohol nozzle (22) are connected with methyl alcohol memory (24) through transmission pipe (15).

2. The low-nitrogen burner for preparing hydrogen by pyrolyzing methanol and capable of reducing flame temperature according to claim 1, wherein a flue gas collector (12) is arranged at two side ends of the right outer wall of the combustion main cylinder (1); the inlet pipe end of the flue gas collector (12) is correspondingly arranged at the outlet position of the right outer wall of the combustion main cylinder body (1), and the outlet pipe end of the flue gas collector (12) is correspondingly arranged at the position of a negative pressure port of the vacuum generator (11).

3. The low-nitrogen burner for producing hydrogen by pyrolysis of methanol capable of reducing flame temperature according to claim 2, characterized in that the pipeline (9) is provided with a gas cooling device (10).

4. The low-nitrogen burner for hydrogen production by methanol pyrolysis capable of reducing flame temperature as claimed in claim 3, wherein each methanol balancer (14) is of an inverted L-shaped structure.

5. The low-nitrogen burner for hydrogen production through methanol pyrolysis capable of reducing flame temperature according to claim 4, characterized in that a fan (25) is arranged inside the mixed gas chamber (2); and the transmission pipe (15), the pipeline (9) and the air inlet pipe of the flue gas collector (12) are respectively provided with a driving pump (26).

6. The low-nitrogen burner for hydrogen production by methanol pyrolysis capable of reducing flame temperature according to claim 4, characterized in that the middle part of the mixed gas chamber (2) is conical; the conical middle part of the mixed gas chamber (2) is provided with a plurality of blades (27) at intervals along the inner conical surface.

7. The low-nitrogen burner for hydrogen production by methanol pyrolysis capable of reducing flame temperature as claimed in claim 4, characterized in that the number of the methanol pyrolysis tubes (16) is 4, and each methanol pyrolysis tube (16) is U-shaped; the U-shaped tubes (5) have 4.

8. The low-nitrogen burner capable of reducing the flame temperature and producing hydrogen through high-temperature methanol cracking is characterized in that a plurality of heat insulation plates (28) are arranged on the inner wall of the combustion chamber (4), and the heat insulation plates (28) are uniformly distributed outside the high-temperature methanol cracking pipe (16) in the circumferential direction; the surface of each heat insulation plate (28) facing the center of the combustion chamber (4) is mirror-processed.

9. The low-nitrogen burner for hydrogen production through methanol pyrolysis capable of reducing flame temperature according to claim 4, characterized in that the partition board (6) is provided with a heat insulation material layer (7).

10. The low-nitrogen burner capable of reducing the flame temperature and producing hydrogen through high-temperature methanol cracking as claimed in claim 4, wherein a temperature and flame collection observation port (29) is formed in the outer cylinder surface of the combustion main cylinder (1) in a penetrating manner, and the temperature and flame collection observation port (29) is right opposite to the position between the inner and outer nozzles of the combustible gas and the ignition device (23).

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