A mixed combustion system including a plasma generating device with ammonia gas as a carrier gas and an ammonia-coal mixed combustion method

Abstract

The application provides a plasma mixed combustion system with ammonia as carrier wind, comprising a plasma generating device, an ammonia pipeline connected with the plasma generating device, and a combustion device associated with the plasma generating device; the combustion device is provided with a pulverized coal wind inlet; and the outlet of the plasma generating device is located in a pulverized coal wind channel in the combustion device. The application fuses the plasma generating device with ammonia coal, uses ammonia as carrier wind, uses the electric arc of the plasma generating device to ionize ammonia into plasma, forms a high-temperature jet, directly ignites ammonia, and realizes good mixed combustion effect of ammonia and fossil fuel. The application uses ammonia as carrier wind of the plasma generating device, which can ignite pulverized coal as an ignition source, and can also use the high-temperature jet formed by ionized ammonia itself to ignite ammonia, so that ammonia has dual characteristics of ignition and fuel, and stable and complete combustion of ammonia is maintained.

Description

Technical Field

[0001] This invention belongs to the field of ammonia combustion power generation technology, and relates to a plasma co-combustion system and ammonia-coal co-combustion method using ammonia as a carrier air. In particular, it relates to a co-combustion system and ammonia-coal co-combustion method including a plasma generating device using ammonia as a carrier air. Background Technology

[0002] To ensure the sustainable development of the ecological environment, research on technologies that use renewable resources to replace traditional fossil fuels to achieve carbon reduction and zero-carbon combustion power generation is in high demand. Ammonia, with its combustible properties, has been shown to be a clean fuel for use in thermal power plants. Its complete combustion produces no pollution and can be obtained from renewable resources. Compared to traditional fossil fuels, ammonia fuel has lower emissions; however, ammonia combustion also presents technical challenges. Due to its relatively low laminar combustion rate and calorific value, ammonia is difficult to stably ignite and completely combust, and it is also necessary to ensure the safe combustion of its combustion products, CO2 and NO. x Low emissions, etc. Currently, the implementation of ammonia-blended combustion in the thermal power sector is still in its early stages.

[0003] Existing ammonia blending combustion technologies generally employ a preheating and swirl process involving pulverized coal or hydrocarbon fuels mixed with ammonia to increase the proportion of ammonia blended and reduce nitrogen oxide emissions. For example, patent 202110585729.X discloses a pulverized coal and ammonia blended fuel preheating and combustion system and method, which generates pyrolysis gas from pulverized coal through a cyclone gasification pyrolysis furnace and mixes it with ammonia gas to reduce nitrogen oxides, thereby achieving low NOx emissions from ammonia. x Stable combustion. Alternatively, a preheating component combined with ultrasound can be used on ammonia fuel to preheat it for easier combustion, and ultrasonic stimulation can ensure more thorough mixing, thereby achieving stable combustion of ammonia and reducing NO. x For emission purposes, such as the ultrasonic synergistic control preheating ammonia combustion method and system disclosed in patent 202111450342.X, which combines fuel preheating to enhance combustion with ultrasonically excited flame to reduce NO. x Emissions are coupled by combining a preheating and ultrasonic components to preheat ammonia fuel before ignition, thus addressing the low flammability of ammonia. This achieves stable combustion of ammonia at a preheated temperature of 320℃ and reduces NO. x It emits emissions while simultaneously increasing flame speed and temperature.

[0004] However, there is currently no mature ammonia-coal co-combustion technology available domestically or internationally. To achieve carbon emission reduction targets for coal-fired boilers, co-combusting zero-carbon fuel ammonia with pulverized coal presents challenges. Because ammonia is difficult to ignite and has a low flame propagation speed, ensuring stable combustion and complete burnout is challenging. While the aforementioned ultrasonic-controlled preheating ammonia combustion method allows for adjustment of the ammonia blending ratio as needed, reducing nitrogen oxide production through chemical reactions and thus achieving stable high-proportion ammonia blending, directly mixing ammonia and coal at the pipeline level carries the risk of uneven and incomplete mixing. Furthermore, insufficient oxygen and temperature, essential conditions for ammonia combustion, can easily lead to decreased combustion efficiency.

[0005] Therefore, finding a more suitable method for ammonia-coal co-combustion, further improving the ammonia blending ratio and combustion stability, and making it more conducive to industrial promotion and application, has become one of the urgent problems to be solved by many front-line researchers in the industry. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a plasma co-combustion system and a method for ammonia-coal co-combustion using ammonia as the carrier air, particularly a co-combustion system including a plasma generator with ammonia as the carrier air. The present invention utilizes the electric arc generated by the plasma generator to ionize ammonia and form a high-temperature jet, directly igniting ammonia and pulverized coal. This solves the problem of ammonia's difficulty in ignition during ammonia co-combustion in coal-fired boilers, and maintains stable ammonia combustion using a continuous high-temperature jet, thus solving the environmental problems caused by incomplete ammonia combustion. This provides a new technical route for ammonia-coal co-combustion.

[0007] This invention provides a plasma co-combustion system using ammonia as a carrier gas, comprising:

[0008] Plasma generator;

[0009] Ammonia gas pipeline connected to the plasma generator;

[0010] Combustion device associated with the plasma generator;

[0011] The combustion device is equipped with a pulverized coal airflow inlet;

[0012] The plasma generator outlet is located in the pulverized coal airflow channel within the combustion device.

[0013] Preferably, the ammonia gas pipeline is connected to the carrier air inlet of the plasma generator.

[0014] Preferably, the orientation of the plasma generator outlet is consistent with the flow direction of the pulverized coal air in the pulverized coal airflow channel.

[0015] 4. The plasma co-combustion system according to claim 1, wherein the plasma co-combustion system further includes a cooling water system;

[0016] The inlet and outlet pipes of the cooling water system are respectively connected to the plasma generator.

[0017] Preferably, the plasma co-combustion system further includes a control power supply;

[0018] The control power supply is connected to the plasma generator.

[0019] Preferably, the combustion device is a combustion device with an internal combustion structure;

[0020] The combustion device contains a flow of pulverized coal air.

[0021] Preferably, the plasma generator and the combustion device are arranged coaxially;

[0022] The combustion device also has one or more stages of combustion chambers inside.

[0023] The present invention also provides a method for co-firing ammonia and coal, comprising the following steps:

[0024] 1) Ammonia gas is used as a carrier working medium and introduced into a plasma generator. The plasma is ionized by the electric arc of the plasma generator to form a high-temperature ammonia plasma torch.

[0025] 2) Ammonia-coal co-combustion is carried out by using a high-temperature ammonia plasma torch to ignite the coal powder gas flow in the combustion device.

[0026] Preferably, the pressure of the ammonia gas is 5–300 kPa;

[0027] The flow rate of the ammonia gas is 10-200 m³ / h. 3 / h;

[0028] The current of the plasma generator is 50-500A.

[0029] Preferably, the temperature of the high-temperature ammonia plasma torch is 1000–10000 K;

[0030] The mass content of pulverized coal in the pulverized coal gas flow is 0.05–0.65 kg / kg;

[0031] The flow rate of the pulverized coal gas stream is 1000–50000 m³ / s. 3 / h;

[0032] The temperature of the flame in the ammonia-coal co-fired combustion is 700–2000℃.

[0033] This invention provides a plasma co-combustion system using ammonia as the carrier air, comprising a plasma generator; an ammonia pipeline connected to the plasma generator; a combustion device associated with the plasma generator; the combustion device having a pulverized coal air inlet; and the plasma generator outlet located in the pulverized coal air flow channel within the combustion device. Compared with existing technologies, this invention creatively integrates the plasma generator with ammonia-coal combustion. Unlike traditional plasma generators that typically use air as the carrier air, ionizing the air to form a high-temperature plasma torch for ignition, this invention uses ammonia as the carrier air instead of the traditional air carrier air. The plasma generator uses an electric arc to ionize the ammonia into plasma, forming a high-temperature jet that directly ignites the ammonia, achieving excellent co-combustion results between ammonia and fossil fuels. This is a novel ammonia-co-combustion technology.

[0034] This invention provides a co-combustion system and a method for ammonia-coal co-combustion, comprising a plasma generator using ammonia as the carrier gas. The plasma generator ionizes ammonia with an electric arc, forming a high-temperature jet that directly ignites the ammonia and pulverized coal. The aim is to solve the problem of ammonia's difficulty in ignition during co-combustion in coal-fired boilers, and to maintain stable ammonia combustion using a continuous high-temperature jet, thus addressing environmental issues caused by incomplete ammonia combustion and providing a new technical approach for ammonia-coal co-combustion.

[0035] This invention uses ammonia as the carrier gas of the plasma generator. It can be used as an ignition source to ignite pulverized coal, and can also ignite ammonia using the high-temperature jet formed by the ionization of ammonia itself. This gives ammonia both ignition and fuel properties, and maintains stable and complete combustion of ammonia. It solves the problems of ammonia being difficult to ignite, unstable combustion, and incomplete combustion. It is a simple and efficient method to achieve good co-firing of ammonia and coal.

[0036] Experimental results show that the plasma co-combustion system and process using ammonia as a carrier gas provided by this invention, with the plasma generator current set to 200-300A and the ammonia flow rate 100-160m³, is effective. 3 / h, the pulverized coal flow rate is 10000~30000m³ / h. 3 When the coal powder content in the gas flow is 0.15-0.50 kg / kg, the high-temperature jet generated by the plasma generator ionizing ammonia ignites the coal powder and ammonia itself, achieving the effect of ammonia-coal co-combustion. The temperature of the co-combustion flame is 700-2000℃, and the combustion effect is good. Attached Figure Description

[0037] Figure 1 This is a simplified structural diagram of the plasma co-combustion system using ammonia as a carrier gas, provided by the present invention. Detailed Implementation

[0038] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention and not for limiting the claims of the present invention.

[0039] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0040] The purity of the raw materials used in this invention is not particularly limited. Preferred raw materials are industrial-grade pure or of the purity commonly used in the field of ammonia-coal co-combustion.

[0041] All terms and abbreviations used in this invention are conventional terms and abbreviations in the field. Each term and abbreviation is clear and distinct in its relevant application area, and those skilled in the art can understand it clearly, accurately, and uniquely based on the terms and abbreviations.

[0042] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0043] There are no particular restrictions on the purity of any of the raw materials used in this invention, but industrial-grade pure materials are preferred.

[0044] This invention provides a plasma co-combustion system using ammonia as a carrier gas, comprising:

[0045] Plasma generator;

[0046] Ammonia gas pipeline connected to the plasma generator;

[0047] Combustion device associated with the plasma generator;

[0048] The combustion device is equipped with a pulverized coal airflow inlet;

[0049] The plasma generator outlet is located in the pulverized coal airflow channel within the combustion device.

[0050] In this invention, the ammonia pipeline is preferably connected to the carrier air inlet of the plasma generator.

[0051] In this invention, the orientation of the plasma generator outlet is preferably consistent with the flow direction of the pulverized coal air in the pulverized coal airflow channel.

[0052] In this invention, the plasma co-combustion system preferably includes a cooling water system.

[0053] In this invention, the inlet and outlet pipes of the cooling water system are preferably connected to the plasma generator, respectively.

[0054] In this invention, the plasma co-combustion system preferably includes a control power supply.

[0055] In this invention, the control power supply is preferably connected to the plasma generator.

[0056] In this invention, the combustion device is preferably a combustion device with an internal combustion structure.

[0057] In this invention, the combustion device preferably has a coal powder airflow circulating inside it.

[0058] In this invention, the plasma generating device is preferably arranged coaxially with the combustion device.

[0059] In this invention, the combustion device preferably also has one or more stages of combustion chambers arranged inside.

[0060] To complete and refine the overall technical solution and better ensure the combustion performance and stability of the ammonia-coal co-combustion system, the aforementioned co-combustion system, including a plasma generator with ammonia as the carrier gas, can have the following structure:

[0061] A co-combustion system and a method for co-combustion of ammonia and coal, comprising a plasma generator and a combustion device.

[0062] The plasma generator uses ammonia as a carrier gas and utilizes the electric arc generated by the device to ionize the ammonia into plasma, forming a high-temperature ammonia plasma torch, which is used to ignite the coal powder gas flow in the combustion device to achieve a highly efficient ammonia-coal co-firing method.

[0063] This invention uses ammonia as the carrier gas in a plasma generator. The high temperature and active substances of the plasma disrupt the molecular structure of ammonia, causing it to decompose and form highly reactive and flammable substances such as hydrogen ions and hydrogen gas. Compared to ammonia, this significantly improves combustion efficiency and burnout characteristics.

[0064] Specifically, the plasma generating device includes an electric arc generating device, and cooling water pipes, ammonia pipes, and a control power supply connected thereto.

[0065] Specifically, the combustion device has an internal combustion structure with pulverized coal airflow flowing inside.

[0066] Specifically, the plasma generator and the combustion device are arranged coaxially.

[0067] Specifically, when burning inferior coal, the combustion device can be equipped with one or more combustion chambers.

[0068] Specifically, in the aforementioned apparatus and method, the plasma generating device is not limited; it can be any device that generates an electric arc from the cathode and anode to ionize ammonia gas into plasma, thereby forming a high-temperature jet.

[0069] This invention provides a novel plasma generating device that significantly improves the utilization rate of ammonia. In the device and method, ammonia serves both as a carrier gas to ignite pulverized coal and as fuel to achieve mixed combustion with pulverized coal.

[0070] See Figure 1 , Figure 1 This is a simplified structural diagram of the plasma co-combustion system using ammonia as a carrier gas provided by the present invention. In the diagram, 1-plasma generator, 2-cooling water pipeline, 3-ammonia pipeline, 4-control power supply, 5-combustion device, and 6-air-powder gas flow inlet.

[0071] The plasma generator 1 is installed inside the combustion device 5. The plasma generator is connected to the cooling water pipeline 2, the ammonia pipeline 3 and the control power supply 4. The cooling water is divided into inlet and return water. The pulverized coal is sent into the combustion device 5 through the air-coal gas inlet 6.

[0072] like Figure 1 As shown, the plasma generator 1 is connected to a cooling water pipe 2, an ammonia gas pipe 3, and a control power supply 4. After the control power supply 4 is turned on and the current is set, an electric arc is formed between the cathode and anode in the plasma generator. Simultaneously, ammonia gas, as a carrier gas, is sent into the plasma generator through the ammonia gas pipe 3. When the ammonia gas passes through the electric arc in the device, it is ionized into plasma, forming a high-temperature jet that is sprayed from the outlet of the plasma generator into the combustion device 5. Pulverized coal enters the combustion device through the air-coal gas inlet 6 and flows towards the outlet in the direction indicated by the arrow. When it passes through the outlet of the plasma generator, it is ignited by the high-temperature jet along with the ammonia gas, achieving mixed combustion of ammonia gas and pulverized coal. Cooling water is supplied through the cooling water pipe 2 to cool the cathode and anode in the plasma generator that generate the high-temperature electric arc, thereby achieving cooling, extending the service life of the anode and cathode, and maintaining the long-term stable operation of the generator.

[0073] This invention provides a method for co-combustion of ammonia and coal, comprising the following steps:

[0074] 1) Ammonia gas is used as a carrier working medium and introduced into a plasma generator. The plasma is ionized by the electric arc of the plasma generator to form a high-temperature ammonia plasma torch.

[0075] 2) Ammonia-coal co-combustion is carried out by using a high-temperature ammonia plasma torch to ignite the coal powder gas flow in the combustion device.

[0076] The present invention first introduces ammonia gas as a carrier working medium into a plasma generator, and the plasma is ionized into plasma by the electric arc of the plasma generator to form a high-temperature ammonia plasma torch.

[0077] In this invention, in step 1), no other carrier working medium such as air is required; only ammonia is used as the carrier air or carrier working medium. That is, the carrier working medium in this invention is only ammonia.

[0078] In this invention, the pressure of the ammonia gas is preferably 5 to 300 kPa, more preferably 50 to 250 kPa, and even more preferably 100 to 200 kPa.

[0079] In this invention, the flow rate of the ammonia gas is preferably 10-200 m³ / h. 3 / h, more preferably 50-160m 3 / h, more preferably 90-120m 3 / h.

[0080] In this invention, the current of the plasma generator is preferably 50-500A, more preferably 100-400A, and even more preferably 200-300A.

[0081] In this invention, the temperature of the high-temperature ammonia plasma torch is preferably 1000-10000K, more preferably 3000-8000K, and even more preferably 5000-6000K.

[0082] Finally, this invention utilizes a high-temperature ammonia plasma torch to ignite the coal powder gas flow within the combustion device for ammonia-coal co-combustion.

[0083] In this invention, the mass content of pulverized coal in the pulverized coal gas flow is preferably 0.05-0.65 kg / kg, more preferably 0.15-0.55 kg / kg, and even more preferably 0.25-0.45 kg / kg.

[0084] In this invention, the flow rate of the pulverized coal gas flow is preferably 1000–50000 m³ / s. 3 / h, more preferably 5000~40000m 3 / h, more preferably 15000~30000m 3 / h.

[0085] In this invention, the temperature of the flame in the ammonia-coal co-fired combustion is preferably 700-2000℃, more preferably 1000-1700℃, and even more preferably 1300-1400℃.

[0086] The above content provides a co-combustion system and a method for co-combustion of ammonia and coal, including a plasma generator with ammonia as the carrier air. This invention integrates the plasma generator with ammonia and coal. Compared to traditional plasma generators that typically use air as the carrier air, ionizing the air to form a high-temperature plasma torch for ignition, this invention uses ammonia as the carrier air instead of the traditional air carrier air. The ammonia is ionized by the electric arc generated by the plasma generator, forming a high-temperature jet that directly ignites the ammonia, achieving a good co-combustion effect between ammonia and fossil fuels. This is a novel ammonia-co-combustion technology.

[0087] This invention provides a co-combustion system and a method for ammonia-coal co-combustion, comprising a plasma generator using ammonia as the carrier gas. The plasma generator ionizes ammonia with an electric arc, forming a high-temperature jet that directly ignites the ammonia and pulverized coal. The aim is to solve the problem of ammonia's difficulty in ignition during co-combustion in coal-fired boilers, and to maintain stable ammonia combustion using a continuous high-temperature jet, thus addressing environmental issues caused by incomplete ammonia combustion and providing a new technical approach for ammonia-coal co-combustion.

[0088] This invention uses ammonia as the carrier gas of the plasma generator. It can be used as an ignition source to ignite pulverized coal, and can also ignite ammonia using the high-temperature jet formed by the ionization of ammonia itself. This gives ammonia both ignition and fuel properties, and maintains stable and complete combustion of ammonia. It solves the problems of ammonia being difficult to ignite, unstable combustion, and incomplete combustion. It is a simple and efficient method to achieve good co-firing of ammonia and coal.

[0089] Experimental results show that the plasma co-combustion system and process using ammonia as a carrier gas provided by this invention, with the plasma generator current set to 200-300A and the ammonia flow rate 100-160m³, is effective. 3 / h, the pulverized coal flow rate is 10000~30000m³ / h. 3 When the coal powder content in the gas flow is 0.15-0.50 kg / kg, the high-temperature jet generated by the plasma generator ionizing ammonia ignites the coal powder and ammonia itself, achieving the effect of ammonia-coal co-combustion. The temperature of the co-combustion flame is 700-2000℃, and the combustion effect is good.

[0090] To further illustrate the present invention, the following describes in detail, with reference to embodiments, a plasma co-combustion system and ammonia-coal co-combustion method using ammonia as a carrier gas provided by the present invention. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures, only to further illustrate the features and advantages of the present invention, and not to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0091] Example 1

[0092] like Figure 1 As shown, the plasma generator 1 is connected to a cooling water pipe 2, an ammonia gas pipe 3, and a control power supply 4. After the control power supply 4 is turned on and the current is set to 200-300A, an electric arc is formed between the cathode and anode in the plasma generator. At the same time, ammonia gas, as a carrier gas, is introduced into the plasma generator through the ammonia gas pipe 3 at a flow rate of 100-160 m³ / h. 3 / h, ammonia gas is ionized into plasma by the electric arc as it passes through the device, forming a high-temperature jet that is injected into the combustion device 5 from the plasma generator outlet. Pulverized coal enters the combustion device through the air-coal gas inlet 6 and flows towards the outlet in the direction indicated by the arrow, with an inlet flow rate of 10,000–30,000 m³ / h. 3 At a rate of / h, the pulverized coal gas stream, upon passing through the plasma generator outlet, is simultaneously ignited by a high-temperature jet along with ammonia gas. The temperature of the high-temperature ammonia plasma torch is 1000–10000K, which can rapidly ignite the pulverized coal particles and the incoming ammonia gas. The temperature of the ammonia-coal co-combustion flame can reach 700–2000℃, which is highly advantageous for achieving mixed combustion and complete burnout of ammonia and pulverized coal. Cooling water is supplied through cooling water pipe 2 to cool the cathode and anode within the plasma generator that generate the high-temperature electric arc, thereby achieving temperature reduction, extending the service life of the anode and cathode, and maintaining the long-term stable operation of the generator.

[0093] Using ammonia as the carrier gas in a plasma generator allows for the direct ignition of ammonia by a high-temperature jet while maintaining its stable combustion. It also ignites the coal powder gas flow in the combustion device, combining the characteristics of ignition and ensuring complete combustion of ammonia. This approach improves the combustion efficiency of both coal powder and ammonia, reduces ammonia escape, and is a simple and efficient method for achieving ammonia-coal co-firing.

[0094] The foregoing has provided a detailed description of a co-combustion system and ammonia-coal co-combustion method for a plasma generator using ammonia as a carrier gas, provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the textual description of the claims, or if they include equivalent structural elements that are not substantially different from the textual description of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A plasma co-combustion system using ammonia as a carrier gas, characterized in that, include: Plasma generator; Ammonia gas pipeline connected to the plasma generator; Combustion device associated with the plasma generator; The combustion device is equipped with a pulverized coal airflow inlet; The plasma generator outlet is located in the pulverized coal airflow channel within the combustion device; The ammonia gas pipeline is connected to the carrier air inlet of the plasma generator; The orientation of the plasma generator outlet is consistent with the flow direction of the pulverized coal air in the pulverized coal airflow channel. The combustion device is a combustion device with an internal combustion structure; The combustion device contains a coal powder airflow. The plasma generator is arranged coaxially with the combustion device; The combustion device also has one or more stages of combustion chambers inside.

2. The plasma co-combustion system according to claim 1, characterized in that, The plasma co-combustion system also includes a cooling water system.

3. The plasma co-combustion system according to claim 2, characterized in that, The inlet and outlet pipes of the cooling water system are respectively connected to the plasma generator.

4. The plasma co-combustion system according to claim 1, characterized in that, The plasma co-combustion system also includes a control power supply.

5. The plasma co-combustion system according to claim 4, characterized in that, The control power supply is connected to the plasma generator.

6. A method for ammonia-coal co-combustion using a plasma co-combustion system as described in any one of claims 1 to 5, characterized in that, Includes the following steps: 1) Ammonia gas is used as a carrier working medium and introduced into the plasma generator. The plasma is ionized into plasma by the electric arc of the plasma generator to form a high-temperature ammonia plasma torch. 2) Ammonia-coal co-combustion is carried out by using a high-temperature ammonia plasma torch to ignite the coal powder gas flow in the combustion device.

7. The ammonia-coal co-combustion method according to claim 6, characterized in that, The pressure of the ammonia gas is 5~300 kPa.

8. The ammonia-coal co-combustion method according to claim 6, characterized in that, The flow rate of the ammonia gas is 10~200m³. 3 / h.

9. The ammonia-coal co-combustion method according to claim 6, characterized in that, The current of the plasma generator is 50~500A.

10. The ammonia-coal co-fired method according to claim 6, characterized in that, The temperature of the high-temperature ammonia plasma torch is 1000~10000K; The mass content of pulverized coal in the pulverized coal gas flow is 0.05~0.65 kg / kg; The flow rate of the pulverized coal gas stream is 1000~50000 m³ / h. 3 / h; The temperature of the flame in the ammonia-coal co-fired combustion is 700~2000℃.

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