A method and apparatus for cracking and burning pure ammonia with brown gas

Abstract

The present application relates to the technical field of cracking combustion, and discloses a device and method for cracking and combusting ammonia by using brown gas. The device uses the heat and high-temperature water vapor generated after the combustion of brown gas to replace traditional electric heating, plasma heating and other methods for cracking ammonia, thereby solving the problems of difficult ignition, low combustion intensity, high nitrogen oxide emission and the like of ammonia fuel. The method comprises the following steps: step 1, ammonia gas and brown gas are input into the same chamber, the brown gas is ignited in the chamber to form high-temperature water vapor, the ammonia gas input into the chamber is heated and decomposed, and the ammonia gas is cracked to form a mixed gas of hydrogen and nitrogen in the environment of the high-temperature water vapor, wherein the mixed gas contains part of uncracked ammonia gas; and step 2, a nozzle is formed at the outlet of the chamber, the mixed gas is sprayed out from the nozzle, the mixed gas is ignited, and the combustion of hydrogen and ammonia is completed. The method can use relatively simple reaction equipment to decompose ammonia gas and combust the decomposed ammonia gas. The present application further discloses a device for cracking and combusting pure ammonia by using brown gas.

Description

Technical Field

[0001] This invention relates to the field of pyrolysis combustion technology, and in particular to a method and apparatus for controlling the pyrolysis combustion of pure ammonia with Brown gas. Background Technology

[0002] Driven by the global pursuit of carbon neutrality, the development of green and renewable energy sources to replace traditional fossil fuels is urgently needed. Hydrogen is considered one of the most promising renewable fuels, but technological challenges related to its storage and transportation remain unresolved. Ammonia (NH3), as a hydrogen-rich, carbon-free clean fuel, has gradually attracted widespread attention due to its high energy density, high octane number, and ease of storage and transportation. It is an important means for my country to develop hydrogen storage and has significant research and development value in fields such as power transmission and thermal power generation.

[0003] However, ammonia has poor chemical reactivity, and its combustion is prone to problems such as unstable flame, low efficiency, and even flameout. Furthermore, due to its nitrogen content, the level of nitrogen oxides emitted during combustion is significantly higher. Compared to conventional hydrocarbon fuels, pure ammonia has a lower laminar combustion rate and calorific value, requires higher energy for ignition, and has a narrower flammability limit, making its combustion more difficult.

[0004] Ammonia catalytic cracking refers to the decomposition of ammonia gas using the presence of hydrogen atoms in the gas, through a catalyst or specific conditions, to obtain hydrogen and nitrogen. This reduces the ignition difficulty of ammonia, increases combustion intensity, and reduces nitrogen oxide emissions. In existing technologies, the cracking temperature of ammonia is typically above 800℃. Secondly, the reaction needs to be carried out under a certain pressure, usually between 1-10 atm. Finally, the cracking requires the action of a catalyst. This type of cracking typically involves complex equipment and is difficult to control. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a method for the decomposition and combustion of pure ammonia using Brown gas. This method utilizes relatively simple reaction equipment to crack ammonia and then combusts the resulting hydrogen. This invention also proposes an apparatus for the cracking and combustion of pure ammonia using Brown gas.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In the first technical solution, a method for cracking and burning pure ammonia with Brown gas includes the following steps:

[0008] Step 1: Ammonia and Brown gas are introduced into the same chamber of the burner. Brown gas is ignited in the chamber of the burner to form high-temperature water vapor. The output end of ammonia is placed above the Brown gas combustion flame to fully mix ammonia and high-temperature water vapor. Ammonia is decomposed in the high-temperature water vapor environment to form a mixture of hydrogen and nitrogen, which contains some undecomposed ammonia.

[0009] Step 2: Ignite the mixed gas at the output end of the burner to complete the full combustion of hydrogen.

[0010] In the second technical solution, an apparatus for cracking and combusting pure ammonia with Brown gas includes:

[0011] The burner body has a chamber, and the top of the burner body has a gaseous fuel outlet that communicates with the internal chamber;

[0012] Brown gas inlet pipe, located at the lower end inside the burner body, is used to continuously supply Brown gas into the burner body;

[0013] The ammonia inlet pipe is located on the side wall of the burner body and is used to continuously supply ammonia into the burner body.

[0014] In the second technical solution, as a preferred embodiment, the burner body is a venturi tube with a closed bottom.

[0015] In the second technical solution, preferably, the Venturi tube is vertically arranged, the lower end of the Venturi tube is closed, the middle part of the Venturi tube is a narrowing section, the lower end of the Venturi tube is closed, the Brown gas input pipe is arranged below the narrowing section and at the closed lower end of the Venturi tube, and the ammonia gas input pipe is arranged below the narrowing section.

[0016] In the second technical solution, preferably, the Brown gas input pipe is equipped with a first flow control valve, and the ammonia gas input pipe is equipped with a second flow control valve.

[0017] In the second technical solution, preferably, the apparatus for cracking and burning pure ammonia with Brown gas further includes an auxiliary fuel supply device, wherein the auxiliary fuel includes...

[0018] An auxiliary fuel container, which contains liquid auxiliary fuel;

[0019] The connecting pipe has its first end located at the bottom of the auxiliary fuel container and its second end located at the open end of the top of the venturi tube. A shut-off valve is installed on the connecting pipe.

[0020] In the second technical solution, as a preferred embodiment, the second end of the connecting pipe is provided with a nozzle, the nozzle is a semi-annular tubular structure, the axis of the circle where the nozzle is located coincides with the axis of the venturi tube, and the projection of the inner annular surface of the nozzle coincides with the inner wall of the upper opening of the venturi tube, and the inner wall of the nozzle is provided with a plurality of spray holes.

[0021] In the second technical solution, preferably, the nozzles on the nozzle are arranged in a ring at equal intervals; the diameter of the nozzle near the end is larger than the diameter of the nozzle in the middle.

[0022] In the second technical solution, preferably, a gas distribution rotary head is provided at the output end of the Brown gas input pipe, and a manifold is provided at the ammonia input pipe;

[0023] One end of the gas distribution rotary head is rotatably connected to the output end of the Brown gas input pipe via a bearing. A through hole is provided at one end of the gas distribution rotary head, and a bearing is installed on the inner wall of the through hole. The inner ring of the bearing is fixedly connected to the gas distribution rotary head, and the outer ring of the bearing is connected to the inner wall of the through hole in the main body of the rotary head. A gas distribution pipe is provided inside the gas distribution rotary head.

[0024] The air distribution pipes inside the main body of the rotating head are arranged in a curved, unidirectional deflection pattern.

[0025] The main ammonia input pipe is horizontally positioned, and the ammonia input pipe also includes manifolds on the upper and lower sides. One end of the manifold is connected to the main ammonia input pipe, and the other end of the manifold is connected to the side wall of the burner body. The extension lines of the delivery ends of the manifolds on both sides and the main ammonia input pipe all face the gas distribution pipe.

[0026] In the second technical solution, as a preferred embodiment, the method of using the apparatus for the cracking and combustion of pure ammonia with Brown gas is as follows:

[0027] State 1, Conventional Combustion: Brown gas is introduced into the lower chamber of the Venturi tube through the Brown gas inlet pipe and ignited. After complete combustion, the Brown gas forms high-temperature steam. Ammonia is introduced into the lower chamber of the Venturi tube through the ammonia inlet pipe. The ammonia is decomposed into hydrogen in the high-temperature steam environment. After being accelerated through the narrow section of the Venturi tube, the hydrogen flows out through the upper opening of the Venturi tube and is ignited at the upper opening of the Venturi tube.

[0028] State 2, Flame State Adjustment: Based on State 1, the first flow control valve and the second flow control valve are adjusted synchronously and proportionally. By adjusting the Brown gas input and ammonia input, the speed and flow rate of hydrogen discharged from the Venturi tube are adjusted to change the flame temperature.

[0029] State 3, Enhanced Combustion State: Open the shut-off valve in the auxiliary fuel supply device. The gas flow rate at the upper opening of the venturi tube is relatively high. The auxiliary fuel in the auxiliary fuel container is drawn out through the connecting pipe and fully mixed with the gas discharged from the upper opening of the venturi tube. When the gas is ignited at the upper end of the venturi tube, it assists in ignition to form an enhanced combustion state.

[0030] The beneficial effects of using this invention are:

[0031] This control method utilizes the high-temperature steam generated by the combustion of Brown's gas to introduce ammonia into the high-temperature steam. The ammonia is then decomposed in the high-temperature steam environment to form hydrogen and nitrogen. The mixture of hydrogen, nitrogen, and undecomposed ammonia is then ignited to form a combustion flame. Its calorific value includes the calorific value of the complete combustion of Brown's gas and the calorific value of the hydrogen after combustion. This method can utilize the environment created by the combustion of Brown's gas to decompose ammonia and can make full use of the calorific value of ammonia and Brown's gas.

[0032] The present invention also provides a control device that can realize the above method. The device can also automatically guide the auxiliary fuel supply device to deliver liquid auxiliary fuel as needed through the gas acceleration effect of the venturi tube, thereby realizing a variety of combustion states. Attached Figure Description

[0033] Figure 1 This is a flowchart of the control method for the cracking and combustion of pure ammonia using Brown gas according to the present invention.

[0034] Figure 2 This is a simplified schematic diagram of the control device for the cracking and combustion of pure ammonia by Brown gas according to the present invention.

[0035] Figure 3 This is a schematic diagram of the control device for the cracking and combustion of pure ammonia by Brown gas according to the present invention.

[0036] Figure 4 Figure 3 A schematic diagram of the nozzle.

[0037] Figure 5 This is a schematic diagram of the nozzle opening after the inner annular surface of the nozzle is expanded.

[0038] Figure 6 This is a schematic diagram of the manifold and gas distribution rotary head in the control device for the cracking and combustion of pure ammonia with Brown gas according to the present invention.

[0039] Figure 7 This is a cross-sectional view of the gas distribution rotary head in the control device for the cracking and combustion of pure ammonia with Brown gas according to the present invention.

[0040] Figure 8 This is a schematic diagram of the gas distribution pipe in the control device for the cracking and combustion of pure ammonia by Brown gas according to the present invention.

[0041] Figure 9 This is a diagram illustrating the effect of the control device for the cracking and combustion of pure ammonia using Brown gas according to the present invention.

[0042] The reference numerals in the figures include:

[0043] 10-Burner body, 11-Brown gas inlet pipe, 111-First flow control valve, 112-Gas distribution rotary head, 1121-Rotary head body, 1122-Gas distribution pipe, 1123-Bearing, 12-Ammonia inlet pipe, 121-Second flow control valve, 122-Manifold, 13-Gas fuel outlet, 20-Auxiliary fuel container, 21-Connecting pipe, 22-Injector nozzle, 221-Injector port, 23-Stop valve, 30-Temperature sensor. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this technical solution clearer, the following detailed description, in conjunction with specific embodiments, further illustrates this technical solution. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this technical solution.

[0045] Example 1

[0046] like Figure 1 As shown in the figure, this embodiment proposes a method for the cracking and combustion of pure ammonia with Brown gas, including the following steps:

[0047] Step 1: Ammonia and Brown gas are introduced into the same chamber of the burner. Brown gas is ignited in the burner chamber to form high-temperature steam. The output end of the ammonia is placed above the Brown gas combustion flame to ensure that the ammonia and high-temperature steam are fully mixed. The ammonia is decomposed in the high-temperature steam environment to form a mixture of hydrogen and nitrogen, which contains some undecomposed ammonia. Step 2: The mixture is ignited at the output end of the burner to complete the full combustion of hydrogen.

[0048] This control method utilizes the high-temperature steam generated by the combustion of Brown's gas to introduce ammonia into the high-temperature steam. The ammonia is then decomposed in the high-temperature steam environment to form hydrogen and nitrogen. The mixture of hydrogen, nitrogen, and the decomposed ammonia is then output and ignited to form a combustion flame. Its calorific value includes the calorific value of the complete combustion of Brown's gas and the calorific value of the hydrogen after combustion. This method can utilize the environment created by the combustion of Brown's gas to decompose ammonia and can make full use of the calorific value of ammonia and Brown's gas.

[0049] Example 2

[0050] like Figures 2-5As shown, this embodiment proposes an apparatus for the cracking and combustion of pure ammonia with Brown gas. This apparatus can perform the method of cracking and combustion of pure ammonia with Brown gas in Embodiment 1. Furthermore, based on the method of cracking and combustion of pure ammonia with Brown gas in Embodiment 1, the structure of each apparatus is further optimized to achieve the effect of multiple combustion states.

[0051] Specifically, such as Figure 2 As shown, the apparatus for cracking and burning pure ammonia with Brown gas includes a burner body 10, which has a chamber and a gas fuel outlet 13 communicating with the internal chamber at the top of the burner body 10; a Brown gas inlet pipe 11, which is located at the lower end inside the burner body 10, for continuously inputting Brown gas into the burner body 10; and an ammonia inlet pipe 12, which is located on the side wall of the burner body 10, for continuously inputting ammonia into the burner body 10.

[0052] In this embodiment, the burner body 10 is a closed container. A gaseous fuel outlet 13 is located at the top of the container, a Brown gas inlet pipe 11 is located at the bottom, and two ammonia inlet pipes 12 are located in the middle. When Brown gas is introduced into the burner body 10 through the Brown gas inlet pipe 11, it is ignited by an ignition device to form the first flame. Continuous Brown gas input creates a high-temperature steam environment inside the burner body 10. Ammonia is continuously introduced into the burner body 10 through the ammonia inlet pipes 12. Approximately 80% of the ammonia is decomposed into hydrogen and oxygen in the high-temperature steam environment. The mixed gas inside the burner body 10 (including hydrogen, nitrogen, and undecomposed ammonia) is discharged through the gaseous fuel outlet 13. An ignition device is located at the gas outlet end of the gaseous fuel outlet 13, igniting the hydrogen to form the second flame.

[0053] Example 3

[0054] This embodiment is a variation based on the above embodiment 2. The apparatus for pyrolyzing and burning pure ammonia with Brown gas in this embodiment can provide a variety of combustion states of the second flame.

[0055] like Figure 3 As shown, in this embodiment, the burner body 10 is a venturi tube with a closed bottom. The main function of the venturi tube is to accelerate the mixed gas (including hydrogen, nitrogen and uncracked ammonia) and make it quickly discharged through the upper end of the venturi tube.

[0056] In this embodiment, the venturi tube is vertically arranged, with its lower end closed and a narrowing section in the middle. The Brown gas inlet pipe 11 is located below the narrowing section and at the closed lower end of the venturi tube, while the ammonia inlet pipe 12 is also located below the narrowing section. Therefore, the cavity below the narrowing section of the venturi tube is the primary combustion cavity, containing both the flame formed by Brown gas combustion and high-temperature water vapor. To achieve the effect of changing the temperature of the second flame, the Brown gas inlet pipe 11 is equipped with a first flow control valve 111, and the ammonia inlet pipe 12 is equipped with a second flow control valve 121.

[0057] As a preferred embodiment, the apparatus for pyrolyzing and burning pure ammonia with Brown gas further includes an auxiliary fuel supply device, the auxiliary fuel including an auxiliary fuel container 20 containing liquid auxiliary fuel; a connecting pipe 21, the first end of which is located at the bottom of the auxiliary fuel container 20, and the second end of which is located at the open end of the top of the venturi tube, and a shut-off valve 23 is provided on the connecting pipe 21.

[0058] When the mixed gas exits from the open top of the Venturi tube, its flow rate is achieved by three parts: first, the Brown gas inlet pipe 11 and the ammonia inlet pipe 12 supply gas, pushing out the mixed gas at the front; second, the molar volume of hydrogen and nitrogen formed after ammonia cracking is 2-3 times larger than that of ammonia; and third, it is achieved through the acceleration effect of the Venturi tube. Therefore, the mixed gas exiting from the open top of the Venturi tube has a relatively high velocity. Due to the high velocity of the mixed gas, a large negative pressure is formed at the second end of the connecting pipe 21. Under the premise of no power and the shut-off valve 23 being open, the fuel in the auxiliary fuel container 20 will be continuously drawn out and rapidly atomized. The auxiliary fuel mixes into the mixed gas exiting the Venturi tube and is fully burned at the second flame.

[0059] like Figure 4 As shown, to accelerate the extraction of auxiliary fuel, a nozzle 22 is provided at the second end of the connecting pipe. The nozzle 22 is a semi-annular tubular structure, with the axis of the circle containing the nozzle 22 coinciding with the axis of the venturi tube. Furthermore, the projection of the inner annular surface of the nozzle 22 coincides with the inner wall of the upper opening of the venturi tube. Several nozzle orifices 221 are formed on the inner wall of the nozzle 22. Multiple nozzle orifices 221 can extract more auxiliary fuel compared to a single tubular nozzle orifice 221. Alternatively, with the same auxiliary fuel flow rate, reducing the diameter of the nozzle orifices 221 can improve the atomization effect of the auxiliary fuel.

[0060] like Figure 5As shown, due to the placement of the temperature sensor 30, the nozzle 22 has a semi-annular structure, with the nozzle openings 221 on the nozzle 22 arranged in a ring at equal intervals. The diameter of the nozzle openings 221 near the end of the nozzle 22 is larger than the diameter of the nozzle openings 221 in the middle of the nozzle 22, to prevent more auxiliary fuel from being sprayed towards the nozzle openings 221 of the temperature sensor 30, thus avoiding interference with the burner body 10.

[0061] like Figure 6 As shown, in this embodiment, in order to further and fully mix the various gases and avoid the formation of concentration differences inside the burner body 10, a gas distribution rotary head 112 is provided at the output end of the Brown gas input pipe 11, and a manifold 122 is provided at the ammonia gas input pipe 12.

[0062] like Figure 7 As shown, in this embodiment, the Brown gas input pipe 11 is a rigid pipe, such as a nylon pipe. One end of the gas distribution rotary head 112 is rotatably connected to the output end of the Brown gas input pipe 11 via a bearing 1123. A through hole is provided at one end of the gas distribution rotary head 112, and the bearing 1123 is installed on the inner wall of the through hole. The inner ring of the bearing 1123 is fixedly connected to the gas distribution rotary head 112, and the outer ring of the bearing 1123 is connected to the inner wall of the through hole in the rotary head body 1121.

[0063] like Figure 8 As shown, the air distribution pipe 1122 inside the rotating head body 1121 is arranged in a curved, unidirectional deflection pattern, combined with... Figure 6 As shown, the air distribution pipes 1122 inside the rotating head body 1121 are arranged in two staggered rows. Therefore, during the process of Brown gas being supplied from the Brown gas input pipe 11 to the rotating head body 1121, the rotating head body 1121 rotates spontaneously because the gas ejected from the air distribution pipes 1122 forms a reaction force.

[0064] like Figure 9 As shown, in this embodiment, the main pipe of the ammonia input pipe 12 is horizontally arranged. The ammonia input pipe 12 also includes manifolds 122 arranged on both the upper and lower sides. One end of the manifold 122 is connected to the main pipe of the ammonia input pipe 12, and the other end is connected to the side wall of the burner body 10. The manifold 122 is preferably a curved pipe, and the extension lines of the delivery ends of both manifolds 122 and the main pipe of the ammonia input pipe 12 are all directed towards the gas distribution pipe 1122. Therefore, when the ammonia input pipe 12 delivers ammonia into the burner body 10, the manifolds 122 on both sides strongly convect and impact the ammonia and the Brown gas released by the rotating head body 1121, ensuring thorough mixing of the ammonia and Brown gas. This does not affect the flow rate, eliminates the need for a separate gas mixing stirring device, and ensures uniform gas distribution. The Brown gas released by the gas distribution rotating head 112 can also fully disperse the ammonia, ultimately achieving thorough mixing of the ammonia and Brown gas.

[0065] Example 4

[0066] This embodiment describes the method of using the apparatus for cracking and burning pure ammonia with Brown gas in Embodiment 3 above, as detailed below:

[0067] State 1, conventional combustion: Brown gas is introduced into the lower chamber of the Venturi tube through Brown gas inlet pipe 11 and ignited. After complete combustion, the Brown gas forms high-temperature water vapor. Ammonia is introduced into the lower chamber of the Venturi tube through ammonia inlet pipe 12. The ammonia is decomposed into hydrogen in the high-temperature water vapor environment. After being accelerated through the narrow section of the Venturi tube, the hydrogen flows out through the upper opening of the Venturi tube and is ignited at the upper opening of the Venturi tube.

[0068] State 2, Flame State Adjustment: Based on State 1, the first flow control valve 111 and the second flow control valve 121 are adjusted synchronously and proportionally. By adjusting the Brown gas input and ammonia input, the speed and flow rate of hydrogen discharged from the Venturi tube are adjusted to achieve the effect of changing the flame temperature.

[0069] State 3, Enhanced Combustion State: When the shut-off valve 23 in the auxiliary fuel supply device is opened, the gas flow rate at the upper opening of the venturi tube is relatively high. The auxiliary fuel in the auxiliary fuel container 20 is drawn out through the connecting pipe 21 and fully mixed with the gas discharged from the upper opening of the venturi tube. When the gas is ignited at the upper end of the venturi tube, it assists in ignition to form an enhanced combustion state.

[0070] The above content is only a preferred embodiment of the present invention. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the ideas of the present invention. As long as these changes do not depart from the concept of the present invention, they all fall within the protection scope of this patent.

Claims

1. A method for the cracking and combustion of pure ammonia with Brown gas, characterized by and The steps are as follows: Step 1: In the combustion chamber of the burner, the Brown gas is ignited to generate heat and produce high-temperature water vapor; ammonia is introduced into the Brown gas combustion chamber to fully mix the ammonia and the high-temperature water vapor. The ammonia is decomposed in the atmosphere of high-temperature water vapor to form a mixture of hydrogen and nitrogen, which contains some undecomposed ammonia. Step 2: Ignite the mixed gas at the output end of the burner to complete the full combustion of hydrogen and ammonia.

2. An apparatus for the cracking and combustion of pure ammonia with Brown gas, characterized in that: include The burner body has a chamber, and the top of the burner body has a gaseous fuel outlet that communicates with the internal chamber; Brown gas inlet pipe, located at the lower end inside the burner body, is used to continuously supply Brown gas into the burner body; The ammonia inlet pipe is located on the side wall of the burner body and is used to continuously supply ammonia into the burner body.

3. The apparatus for cracking and combusting pure ammonia with Brown gas according to claim 2, characterized in that: The burner body is a venturi tube with a closed bottom.

4. The apparatus for cracking and combusting pure ammonia with Brown gas according to claim 3, characterized in that: The Venturi tube is vertically installed with its lower end closed. The middle section of the Venturi tube is a narrowing section. The Brown gas inlet pipe is located below the narrowing section and at the closed lower end of the Venturi tube. The ammonia gas inlet pipe is located below the narrowing section.

5. The apparatus for cracking and combusting pure ammonia with Brown gas according to claim 4, characterized in that: The Brown gas inlet pipe is equipped with a first flow control valve, and the ammonia inlet pipe is equipped with a second flow control valve.

6. The apparatus for cracking and combusting pure ammonia with Brown gas according to claim 5, characterized in that: The apparatus for cracking and burning pure ammonia with Brown gas also includes an auxiliary fuel supply device, wherein the auxiliary fuel comprises: An auxiliary fuel container, which contains liquid auxiliary fuel; The connecting pipe has its first end located at the bottom of the auxiliary fuel container and its second end located at the open end of the top of the venturi tube. A shut-off valve is installed on the connecting pipe.

7. The apparatus for cracking and combusting pure ammonia with Brown gas according to claim 6, characterized in that: The second end of the connecting pipe is provided with a nozzle, which is a semi-circular tubular structure. The axis of the circle containing the nozzle coincides with the axis of the venturi tube, and the projection of the inner ring surface of the nozzle coincides with the inner wall of the upper opening of the venturi tube. The inner wall of the nozzle has a plurality of spray holes.

8. The apparatus for cracking and combusting pure ammonia with Brown gas according to claim 7, characterized in that: The nozzle has nozzles arranged in a ring at equal intervals; the diameter of the nozzle near the end is larger than the diameter of the nozzle in the middle.

9. The apparatus for cracking and combusting pure ammonia with Brown gas according to claim 2, characterized in that: A gas distribution rotary head is installed at the output end of the Brown gas input pipe, and a manifold is installed at the ammonia input pipe. One end of the gas distribution rotary head is rotatably connected to the output end of the Brown gas input pipe via a bearing. A through hole is provided at one end of the gas distribution rotary head, and a bearing is installed on the inner wall of the through hole. The inner ring of the bearing is fixedly connected to the gas distribution rotary head, and the outer ring of the bearing is connected to the inner wall of the through hole in the main body of the rotary head. A gas distribution pipe is provided inside the gas distribution rotary head. The air distribution pipes inside the main body of the rotating head are arranged in a curved, unidirectional deflection pattern. The main ammonia input pipe is horizontally positioned, and the ammonia input pipe also includes manifolds on the upper and lower sides. One end of the manifold is connected to the main ammonia input pipe, and the other end of the manifold is connected to the side wall of the burner body. The extension lines of the delivery ends of the manifolds on both sides and the main ammonia input pipe all face the gas distribution pipe.

10. The apparatus for cracking and combusting pure ammonia with Brown gas according to any one of claims 6-9, characterized in that: The apparatus for cracking and burning pure ammonia with Brown gas is used as follows: State 1, Conventional Combustion: Brown gas is introduced into the lower chamber of the Venturi tube through the Brown gas inlet pipe and ignited. After complete combustion, the Brown gas forms high-temperature steam. Ammonia is introduced into the lower chamber of the Venturi tube through the ammonia inlet pipe. The ammonia is decomposed in the high-temperature steam environment to form hydrogen and nitrogen. After being accelerated through the narrow section of the Venturi tube, the hydrogen flows out through the upper opening of the Venturi tube and is ignited at the upper opening of the Venturi tube. State 2, Flame State Adjustment: Based on State 1, the first flow control valve and the second flow control valve are adjusted synchronously and proportionally. By adjusting the Brown gas input and ammonia input, the speed and flow rate of hydrogen discharged from the Venturi tube are adjusted to change the flame temperature. State 3, Enhanced Combustion State: Open the shut-off valve in the auxiliary fuel supply device. The gas flow rate at the upper opening of the venturi tube is relatively high. The auxiliary fuel in the auxiliary fuel container is drawn out through the connecting pipe and fully mixed with the gas discharged from the upper opening of the venturi tube. When the gas is ignited at the upper end of the venturi tube, it assists in ignition to form an enhanced combustion state.

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