Natural gas hydrogen-doped symmetrical built-in premixing water-cooling combustion gas-fired boiler

Abstract

The invention discloses a natural gas hydrogen-doped symmetrical built-in premixing water-cooling combustion gas-fired boiler which comprises a built-in premixing mechanism arranged on the front side in a boiler body, a combustion chamber arranged in the boiler body, a combustion heat exchange mechanism arranged in the combustion chamber, a steam box arranged on the boiler body, and a water cooling mechanism arranged on the steam box, a water tank is arranged below the boiler body, an exhaust flue is arranged on the rear side of the boiler body, waste heat recovery pipes are symmetrically distributed in the exhaust flue, a purification box is arranged at an outlet of the exhaust flue, and an exhaust port is formed in the purification box. The expanded gas outlet is matched with the stirring mechanism and the stepped diffusion pore plate, so that natural gas and hydrogen are fully and uniformly premixed and then synchronously enter the combustion chamber with air to be combusted, combustion is more sufficient, flames are more uniform due to the coaxial double-pipe structure, meanwhile, tempering can be avoided, and the combustor is safer and more reliable; during exhausting, combustion waste gas is subjected to water purification, and nitrogen oxides in the combustion waste gas are effectively removed.

Description

Technical Field

[0001] The present invention relates to the technical field of gas boilers, and particularly to a natural gas hydrogen-doped symmetrically internally premixed water-cooled combustion gas boiler. Background Art

[0002] With the transformation of the global energy structure and the increasingly strict environmental protection requirements, the combustion mode of traditional fossil fuels faces huge challenges; as an important heat energy supply device, gas boilers play an important role in industrial production and daily life; however, traditional gas boilers still have many deficiencies in terms of combustion efficiency, emission control, and energy utilization.

[0003] In recent years, hydrogen energy, as a clean and efficient energy carrier, has received extensive attention; mixing hydrogen into natural gas for combustion can not only improve combustion efficiency but also significantly reduce carbon emissions; however, the combustion characteristics of hydrogen are quite different from those of natural gas, and direct hydrogen-doped combustion easily leads to problems such as unstable combustion and increased nitrogen oxide (NOx) emissions.

[0004] In addition, most existing gas boiler burners adopt external premixing or non-premixing combustion methods, which have problems such as large air flow disturbance and poor mixing uniformity. The produced mixed gas has limitations in terms of combustion uniformity, flame stability, and pollutant control, and one-way combustion has the problem of uneven heating. Therefore, the present invention proposes a natural gas hydrogen-doped symmetrically internally premixed water-cooled combustion gas boiler to solve the problems existing in the prior art. Summary of the Invention

[0005] In view of the above problems, the object of the present invention is to propose a natural gas hydrogen-doped symmetrically internally premixed water-cooled combustion gas boiler. This natural gas hydrogen-doped symmetrically internally premixed water-cooled combustion gas boiler enables the full and uniform premixing of natural gas and hydrogen through an enlarged gas outlet in cooperation with a stirring mechanism and a stepped diffusion orifice plate, and then synchronously enters the combustion chamber for combustion with air, making the combustion more complete. Moreover, the coaxial double-tube structure makes the flame more uniform, and at the same time, flashback can be avoided, making it safer and more reliable. When exhausting, the combustion waste gas is purified by passing through water, effectively removing nitrogen oxides in the combustion waste gas.

[0006] To achieve the object of the present invention, the present invention is realized through the following technical solutions: A natural gas hydrogen-doped symmetric built-in premixed water-cooled combustion gas boiler, comprising a boiler body, a built-in premixing mechanism, a connecting gas chamber, a combustion chamber, a combustion heat exchange mechanism, a steam box, a water tank and an exhaust mechanism. An built-in premixing mechanism is arranged on the front side inside the boiler body, a combustion chamber is arranged inside the boiler body, the built-in premixing mechanism and the combustion chamber are connected through the connecting gas chamber, a combustion heat exchange mechanism is arranged inside the combustion chamber for generating hot water steam, a steam box is arranged on the boiler body, and a water tank is arranged under the boiler body for water inlet and storage. The exhaust mechanism includes an exhaust flue, a waste heat recovery pipe, a purification box and an exhaust port. An exhaust flue is arranged on the rear side of the boiler body, and the exhaust flue is in an inverted U-shaped structure. Waste heat recovery pipes are symmetrically distributed inside the exhaust flue, and the waste heat recovery pipes are arranged at both sections of the inverted U-shaped exhaust flue. A purification box is arranged at the outlet of the exhaust flue, and an exhaust port is arranged on the purification box.

[0007] Further improvement lies in that: The built-in premixing mechanism includes a premixing chamber, an air inlet, a buffer orifice plate, a vortex air outlet, a stirring mechanism and a stepped diffusion orifice plate. A premixing chamber is arranged on the front side inside the boiler body, air inlets are symmetrically arranged on both sides of the premixing chamber, buffer orifice plates are symmetrically arranged inside the premixing chamber on the inner sides of the air inlets, and vortex air outlets are symmetrically distributed inside the premixing chamber on the inner sides of the buffer orifice plates, so that the incoming gas generates a vortex and the opposite arrangement structure can disperse hydrogen and natural gas in opposite directions to achieve efficient mixing. A stirring mechanism is arranged inside the premixing chamber, and a stepped diffusion orifice plate is arranged at the rear side inside the premixing chamber. The stepped diffusion orifice plate is a double-layer plate structure, the aperture decreases, and the holes on the plate are staggeredly distributed. The rear side of the stepped diffusion orifice plate is communicated with the connecting gas chamber.

[0008] Further improvement lies in that: The stirring mechanism includes a rotating shaft, stirring blades and a driving motor. Rotating shafts are symmetrically arranged inside the premixing chamber, stirring blades are symmetrically distributed at one end of the rotating shaft close to the stepped diffusion orifice plate, a driving motor is arranged outside the premixing chamber, the output end of the driving motor is in gear meshing transmission with the rotating shaft, and through holes are evenly distributed on the stirring blades, which can further stir the mixed gas.

[0009] Further improvement lies in that: Gas concentration sensors are arranged on the side of the buffer orifice plate close to the air inlet. The gas concentration sensors include a hydrogen concentration sensor and a natural gas concentration sensor, and an electric control valve is arranged on the air inlet.

[0010] A further improvement lies in that: the combustion heat exchange mechanism includes a mixed combustion mechanism, an integrated heat exchanger, heat exchange fins, a hot water channel, a superheated water channel and a superheated water pipe. A mixed combustion mechanism is arranged on the connecting air chamber and the side plate of the combustion chamber. An integrated heat exchanger is symmetrically arranged between the steam box and the water tank in the combustion chamber. Heat exchange fins are arranged on the outer side of the integrated heat exchanger. The heat exchange fins on the adjacent surfaces of multiple groups of integrated heat exchangers are distributed with an upper and lower staggered gap, improving the heat absorption efficiency. A hot water channel and a superheated water channel are arranged in the integrated heat exchanger. The hot water channel communicates with the steam box and the water tank. Superheated water pipes are arranged in the steam box and the water tank. The superheated water channel communicates with the superheated water pipes, and the superheated water pipes are connected to an external heat exchange medium.

[0011] A further improvement lies in that: the mixed combustion mechanism includes a mixed gas outlet pipe, an air pipe, an air injection port, an air pump and an ignition needle. Two groups of connecting air chambers are symmetrically arranged on both sides inside the boiler body. Mixed gas outlet pipes are symmetrically distributed on the connecting air chamber and the side plate of the combustion chamber. Air pipes are symmetrically distributed in the connecting air chamber. Air injection ports are distributed on the air pipes. The air injection ports and the mixed gas outlet pipes are distributed with a coaxial gap. The coaxial double-pipe structure can avoid backfire. An air pump is arranged on the front side of the boiler body. The air pump is connected to the air pipe to provide oxygen for the combustion of the mixed gas ejected from the mixed gas outlet pipe. Ignition needles are symmetrically arranged on the upper and lower sides of the inner side plates of the connecting air chambers on both sides in the combustion chamber.

[0012] A further improvement lies in that: a water passing port is arranged in the purification box. The water passing port communicates with the outlet of the exhaust flue. A stirring rotating shaft is rotatably arranged in the purification box. Stirring orifice plates are symmetrically distributed on the stirring rotating shaft. A stirring motor is arranged above the purification box. The output end of the stirring motor is connected to the stirring rotating shaft for transmission, driving the stirring orifice plates to rotate, cutting the combustion waste gas to make it fully contact and react with the internal neutralization reaction liquid. An air extraction fan is arranged inside the exhaust port. A neutralization reaction liquid is contained in the purification box to neutralize and react with the nitrogen oxides in the combustion waste gas.

[0013] A further improvement lies in that: a water inlet is arranged on one side of the water tank. A main controller is arranged on the rear side of the boiler body for the control and adjustment of the whole device. A pressure sensor is also arranged inside the steam box for detecting the internal steam pressure.

[0014] The beneficial effects of the present invention are as follows: through the enlarged air outlet in cooperation with the stirring mechanism and the stepped diffusion orifice plate, the natural gas and hydrogen are fully and evenly pre-mixed, and then enter the combustion chamber for combustion synchronously with the air, making the combustion more complete. And the coaxial double-pipe structure makes the flame more uniform, and at the same time can avoid backfire, being safer and more reliable. When exhausting, the combustion waste gas is purified by passing water, effectively removing the nitrogen oxides in the combustion waste gas, being more environmentally friendly;

[0015] Through the symmetric combustion structure and the arrangement of heat exchange fins on the integrated heat exchanger structure, the heat distribution and heat exchange are made more uniform, avoiding the problem of uneven heat exchange caused by unidirectional jet combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the front view of the present invention.

[0017] Figure 2 This is the sectional structure diagram of the front view premixing chamber of the present invention.

[0018] Figure 3 This is the sectional structure diagram of the side view exhaust mechanism of the present invention.

[0019] Figure 4 This is the sectional structure diagram of the side view combustion chamber of the present invention.

[0020] Figure 5 This is the sectional structure diagram of the top view of the present invention.

[0021] Figure 6 This is the sectional structure diagram of the front view integrated heat exchanger of the present invention.

[0022] Figure 7 This is the sectional structure diagram of the top view of the integrated heat exchanger of the present invention.

[0023] Wherein: 1. Boiler body; 2. Connecting air chamber; 3. Combustion chamber; 4. Steam box; 5. Water tank; 6. Exhaust flue; 7. Waste heat recovery pipe; 8. Purification box; 9. Exhaust port; 10. Premixing chamber; 11. Intake port; 12. Buffer orifice plate; 13. Vortex air outlet; 14. Step diffusion orifice plate; 15. Rotating shaft; 16. Stirring blade; 17. Driving motor; 18. Gas concentration sensor; 19. Electric control valve; 20. Integrated heat exchanger; 21. Heat exchange fin; 22. Heat exchange water channel; 23. Superheated water channel; 24. Superheated water pipe; 25. Mixed gas outlet pipe; 26. Air pipe; 27. Gas injection port; 28. Air pump; 29. Ignition needle; 30. Water passing port; 31. Stirring rotating shaft; 32. Stirring orifice plate; 33. Stirring motor; 34. Exhaust fan; 35. Water inlet; 36. Main controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to deepen the understanding of the present invention, the following will further elaborate on the present invention in combination with embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation to the protection scope of the present invention.

[0025] According to Figures 1-7As shown in the figure, this embodiment provides a natural gas hydrogen-doped symmetric built-in premixed water-cooled combustion gas boiler, which includes a boiler body 1, a built-in premixing mechanism, a connecting air chamber 2, a combustion chamber 3, a combustion heat exchange mechanism, a steam box 4, a water tank 5 and an exhaust mechanism. A built-in premixing mechanism is arranged on the front side inside the boiler body 1, a combustion chamber 3 is arranged inside the boiler body 1, the built-in premixing mechanism is connected to the combustion chamber 3 through the connecting air chamber 2, and a combustion heat exchange mechanism is arranged inside the combustion chamber 3 for generating hot water steam. A steam box 4 is arranged on the boiler body 1, and a water tank 5 is arranged below the boiler body 1 for water inlet and storage. The exhaust mechanism includes an exhaust flue 6, a waste heat recovery pipe 7, a purification box 8 and an exhaust port 9. The exhaust flue 6 is arranged on the rear side of the boiler body 1, and the exhaust flue is in an inverted U-shaped structure. The waste heat recovery pipes 7 are symmetrically distributed inside the exhaust flue 6, and the waste heat recovery pipes are arranged at both sections of the inverted U-shaped exhaust flue. A purification box 8 is arranged at the outlet of the exhaust flue 6, and an exhaust port 9 is arranged on the purification box 8 to purify the combustion exhaust gas.

[0026] The built-in premixing mechanism includes a premixing chamber 10, an air inlet 11, a buffer orifice plate 12, a vortex air outlet 13, a stirring mechanism and a stepped diffusion orifice plate 14. The premixing chamber 10 is arranged on the front side inside the boiler body 1, and air inlets 11 are symmetrically arranged on both sides of the premixing chamber 10 for inlet of hydrogen and natural gas. Buffer orifice plates 12 are symmetrically arranged inside the premixing chamber 10 on the inner sides of the air inlets 11 to buffer the flow rate of the incoming gas. Vortex air outlets 13 are symmetrically distributed inside the premixing chamber 10 on the inner sides of the buffer orifice plates 12, so that the incoming gas generates a vortex and the opposite arrangement structure can disperse hydrogen and natural gas in opposite directions to achieve efficient mixing. A stirring mechanism is arranged inside the premixing chamber 10 to further improve the mixing effect. A stepped diffusion orifice plate 14 is arranged at the rear side inside the premixing chamber 10. The stepped diffusion orifice plate is a double-layer plate structure with decreasing aperture and the holes on the plate are staggered. The rear side of the stepped diffusion orifice plate 14 is communicated with the connecting air chamber 2 to send the mixed hydrogen-doped natural gas to the combustion chamber for combustion.

[0027] The stirring mechanism includes a rotating shaft 15, stirring blades 16 and a driving motor 17. Rotating shafts 15 are symmetrically arranged inside the premixing chamber 10. Stirring blades 16 are symmetrically distributed at one end of the rotating shafts 15 close to the stepped diffusion orifice plate 14. A driving motor 17 is arranged outside the premixing chamber 10, and the output end of the driving motor 17 is in gear meshing transmission with the rotating shaft 15. Through holes are evenly distributed on the stirring blades 16, which can further stir the mixed gas and improve the mixing uniformity.

[0028] A gas concentration sensor 18 is provided on one side of the buffer orifice plate 12 near the air inlet 11. The gas concentration sensor 18 includes a hydrogen concentration sensor and a natural gas concentration sensor. An electrically controlled valve 19 is provided on the air inlet 11. Since the concentrations of hydrogen and natural gas will fluctuate, the concentrations of hydrogen and natural gas are monitored respectively during intake, and processed by the main controller described later. The electrically controlled valve is controlled according to the set mixing concentration ratio of hydrogen and natural gas to adjust the intake flow rates of hydrogen and natural gas, so as to achieve precise control of the mixing concentration ratio of hydrogen-enriched natural gas.

[0029] The combustion heat exchange mechanism includes a mixed combustion mechanism, an integrated heat exchanger 20, heat exchange fins 21, a heat exchange water channel 22, a superheated water channel 23, and a superheated water pipe 24. A mixed combustion mechanism is provided on the side plate of the combustion chamber 3 connecting the air storage chamber 2. An integrated heat exchanger 20 is symmetrically arranged between the steam box 4 and the water tank 5 in the combustion chamber 3. Heat exchange fins 21 are arranged on the outside of the integrated heat exchanger 20. The heat exchange fins on the adjacent surfaces of multiple groups of integrated heat exchangers are distributed with upper and lower staggered gaps to improve the heat absorption efficiency. A heat exchange water channel 22 and a superheated water channel 23 are arranged in the integrated heat exchanger 20. The heat exchange water channel 22 connects the steam box 4 and the water tank 5. Superheated water pipes 24 are arranged in the steam box 4 and the water tank 5. The superheated water channel 23 is connected to the superheated water pipe 24. The superheated water pipe is connected to an external heat exchange medium and is started when the inside of the combustion chamber is overheated to protect the internal structure of the combustion chamber.

[0030] The mixed combustion mechanism includes a mixed gas outlet pipe 25, an air pipe 26, an air injection port 27, an air pump 28, and an ignition needle 29. Two groups are symmetrically arranged connecting the air storage chamber 2 and are distributed on both sides inside the boiler body. Mixed gas outlet pipes 25 are symmetrically distributed on the side plate of the combustion chamber 3 connecting the air storage chamber 2. Air pipes 26 are symmetrically distributed in the air storage chamber 2. Air injection ports 27 are distributed on the air pipe 26. The air injection ports 27 and the mixed gas outlet pipes 25 are distributed with coaxial gaps. The coaxial double-pipe structure can avoid backfire. An air pump 28 is provided on the front side of the boiler body 1. The air pump 28 is connected to the air pipe 26 to provide oxygen for the combustion of the mixed gas ejected from the mixed gas outlet pipe. Ignition needles 29 are symmetrically arranged on both sides inside the combustion chamber 3 at the upper and lower sides of the inner side plate of the air storage chamber 2.

[0031] A water inlet 30 is provided in the purification box 8. The water inlet 30 is connected to the outlet of the exhaust flue 6. A stirring rotating shaft 31 is rotatably arranged in the purification box 8. Stirring orifice plates 32 are symmetrically distributed on the stirring rotating shaft 31. A stirring motor 33 is provided above the purification box 8. The output end of the stirring motor 33 is connected to the stirring rotating shaft 31 for transmission to drive the stirring orifice plate to rotate, cut the combustion waste gas so that it fully contacts and reacts with the internal neutralization reaction liquid. An exhaust fan 34 is arranged inside the exhaust port 9. The purification box 8 is filled with a neutralization reaction liquid to neutralize the nitrogen oxides in the combustion waste gas and completely remove the nitrogen oxide pollution in the discharged waste gas.

[0032] One side of the water tank 5 is provided with a water inlet 35, and a main controller 36 is provided at the rear side of the boiler body 1 for controlling and adjusting the whole device. A pressure sensor is also built in the steam box 4 for detecting the internal steam pressure.

[0033] When the natural gas hydrogen-doped symmetrically internally premixed water-cooled combustion gas boiler is in use, natural gas and hydrogen are respectively connected to the premixing chamber through the air inlets first. Then, the two gases are mixed in multiple stages through the structure in the premixing chamber to make them fully and evenly mixed. The mixed gas then enters the communicating gas chamber. The air pump is started to pump in the filtered air and spray it out from the air injection port. At the same time, the mixed gas is sprayed out from the mixed gas outlet pipe. The ignition needle is started to ignite. All the mixed gas outlet pipes spray out the mixed gas for combustion. The integrated heat exchanger in the combustion chamber fully absorbs heat to generate steam and enters the steam box. The combustion exhaust gas is recovered for waste heat and purified through the exhaust mechanism and then discharged to remove the pollution of nitrogen oxides in the exhaust gas.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler, characterized in that: The invention comprises a boiler body (1), a built-in premixing mechanism, a connecting air bin (2), a combustion chamber (3), a combustion heat exchange mechanism, a steam box (4), a water tank (5) and an exhaust mechanism. The front side of the boiler body (1) is provided with a built-in premixing mechanism. The boiler body (1) is provided with a combustion chamber (3). The built-in premixing mechanism and the combustion chamber (3) are connected via a connecting air bin (2). The combustion chamber (3) is provided with a combustion heat exchange mechanism. The boiler body (1) is provided with a steam box (4). The boiler body (1) is provided with a water tank (5) below. The exhaust mechanism comprises an exhaust flue (6), a waste heat recovery pipe (7), a purification box (8) and an exhaust port (9). The rear side of the boiler body (1) is provided with an exhaust flue (6). The waste heat recovery pipes (7) are symmetrically distributed in the exhaust flue (6). The outlet of the exhaust flue (6) is provided with a purification box (8). The purification box (8) is provided with an exhaust port (9).

2. A natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler according to claim 1, characterized in that: The built-in premixing mechanism comprises a premixing chamber (10), an air inlet (11), a buffer orifice plate (12), a vortex air outlet (13), a stirring mechanism and a stepped diffusion orifice plate (14); the premixing chamber (10) is provided at the front side of the boiler body (1); the air inlet (11) is symmetrically provided on both sides of the premixing chamber (10); the buffer orifice plate (12) is symmetrically provided in the premixing chamber (10) inside the air inlet (11); the vortex air outlet (13) is symmetrically distributed in the premixing chamber (10) inside the buffer orifice plate (12); the stirring mechanism is provided in the premixing chamber (10); the stepped diffusion orifice plate (14) is provided at the rear side of the premixing chamber (10); the rear side of the stepped diffusion orifice plate (14) is connected to the connecting air chamber (2).

3. A natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler according to claim 2, characterized in that: The stirring mechanism comprises a rotating shaft (15), a stirring blade (16) and a driving motor (17); the rotating shaft (15) is symmetrically arranged in the premixing chamber (10); the stirring blades (16) are symmetrically distributed on one end of the rotating shaft (15) close to the stepped diffusion orifice plate (14); the driving motor (17) is arranged outside the premixing chamber (10); the output end of the driving motor (17) is gear-engaged with the rotating shaft (15); and the stirring blades (16) are evenly distributed with through holes.

4. A natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler according to claim 2, characterized in that: A gas concentration sensor (18) is provided on the buffer orifice plate (12) on the side close to the air inlet (11), the gas concentration sensor (18) comprising a hydrogen concentration sensor and a natural gas concentration sensor, and an electric control valve (19) is provided on the air inlet (11).

5. A natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler according to claim 1, characterized in that: The combustion heat exchange mechanism comprises a mixed combustion mechanism, an integrated heat exchanger (20), a heat exchange plate (21), a hot water exchange channel (22), a superheated water channel (23) and a superheated water pipe (24). The mixed combustion mechanism is provided on the side plate connecting the gas chamber (2) and the combustion chamber (3). The integrated heat exchanger (20) is symmetrically provided between the steam box (4) and the water tank (5) in the combustion chamber (3). The outer side of the integrated heat exchanger (20) is provided with a heat exchange channel (22) and a superheated water channel (23). The hot water exchange channel (22) connects the steam box (4) and the water tank (5). The steam box (4) and the water tank (5) are provided with a superheated water pipe (24). The superheated water channel (23) is connected with the superheated water pipe (24).

6. A natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler according to claim 5, characterized in that: The mixed combustion mechanism comprises a mixed gas outlet pipe (25), an air pipe (26), an air injection port (27), an air pump (28) and an ignition needle (29); the communicating gas chamber (2) is symmetrically provided with two groups; the mixed gas outlet pipe (25) is symmetrically distributed on the communicating gas chamber (2) and the side plate of the combustion chamber (3); the air pipe (26) is symmetrically distributed in the communicating gas chamber (2); the air injection port (27) is distributed on the air pipe (26); the air injection port (27) and the mixed gas outlet pipe (25) are coaxially spaced; the front side of the boiler body (1) is provided with an air pump (28); the air pump (28) is connected to the air pipe (26); and ignition needles (29) are symmetrically provided on the upper and lower sides of the inner side plate of the communicating gas chamber (2) on both sides in the combustion chamber (3).

7. A natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler according to claim 1, characterized in that: The purification box (8) is provided with a water outlet (30), the water outlet (30) is communicated with the outlet of the exhaust flue (6), the purification box (8) is provided with a stirring shaft (31), the stirring shaft (31) is symmetrically provided with stirring orifice plates (32), a stirring motor (33) is provided above the purification box (8), the output end of the stirring motor (33) is connected to the stirring shaft (31) for transmission, an exhaust fan (34) is provided inside the exhaust port (9), and the purification box (8) is filled with a neutralization reaction liquid.

8. The natural gas hydrogen-blended symmetrical built-in premixed water-cooled combustion gas boiler according to claim 1, characterized in that: A water inlet (35) is provided on one side of the water tank (5), a main controller (36) is provided on the rear side of the boiler body (1), and a pressure sensor is also built into the steam box (4).

Images