Pulverized coal combustion equipment based on comprehensive arrangement of multiple cooling modes

Abstract

The invention discloses pulverized coal combustion equipment based on comprehensive arrangement of multiple cooling modes, and belongs to the technical field of coal combustion, the pulverized coal combustion equipment comprises a plasma generation unit and a combustor unit, the plasma generation unit comprises a plasma generator and a plasma power supply, and the plasma generator is connected with the plasma power supply; the burner unit comprises a burner body and a burner elbow, the burner body is connected with the burner elbow, the end, away from the burner body, of the burner elbow is connected with a pulverized coal pipeline, and the outlet end of the burner body is connected with the boiler; and a plurality of plasma generators are arranged on the burner body. The temperature field of the plasma high-temperature jet flow and the spatial layout of the plasma high-temperature jet flow and the pulverized coal are combined and optimized, the power of the plasma generator is reduced by improving the heat energy utilization efficiency, and the combustion device is simple in system, low in energy consumption, low in operation and maintenance cost, wide in coal type application range and good in application prospect.

Description

Technical Field

[0001] This invention relates to the technical field of coal combustion, and in particular to a pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods. Background Technology

[0002] Currently, China has abundant coal resources, and coal-fired power plants play a vital role in the power supply. Although wind power, solar power, and other new energy power generation, as well as hydropower, currently account for 56.4% of my country's total installed power generation capacity, traditional pulverized coal combustion power generation remains the cornerstone of the overall energy supply, playing a crucial role in power supply and grid stability. Moreover, with the further development of new energy sources, a certain proportion of pulverized coal power plants will inevitably be built to offset the risks of instability in new energy sources. Therefore, for a considerable period of time, coal will remain an important power generation resource in my country, and coal combustion technology still needs to be continuously improved and upgraded.

[0003] Currently, pulverized coal power plant boilers, supplied via pulverized coal pipelines, employ two main ignition or combustion stabilization methods during startup, low-load operation, and grid peak shaving. One method utilizes oil guns, while the other uses plasma generators. The former consumes a large amount of fuel oil, but my country faces fuel oil shortages and excessive reliance on imports, resulting in high operating costs and significant vulnerability to international fuel oil supply. Furthermore, factors such as the atomization capacity of the oil gun, ignition temperature, and air distribution conditions can cause some unburned oil to form oil mist, which enters the flue gas and adheres to the electrode plates of the electrostatic precipitator, affecting the flue gas dust removal efficiency. Simultaneously, the oil-mist-laden flue gas forms foam upon contact with the desulfurizing agent, causing the desulfurizing agent level to be artificially high, resulting in insufficient desulfurization dosage and impacting the desulfurization effect.

[0004] While plasma generators overcome the shortcomings of oil guns, current plasma generators employ mechanical compression and magnetic contraction techniques. The arc plasma jet exhibits strong contractility, a small high-temperature zone with a large temperature gradient, and high jet rigidity. Within the burner's ignition zone, only a small amount of pulverized coal can be introduced into the high-temperature zone (>5000℃). The chemical and thermal energy of the plasma is not fully released and utilized, resulting in limited ignition capability. It is only suitable for easily combustible pulverized coal with high volatile matter (air-dried basis volatile matter Vd>20%). For boiler units containing lean coal, anthracite, and lignite—coal types that are difficult to ignite (accounting for 60%-70%)—the field of plasma ignition is essentially nonexistent.

[0005] For related technologies, please refer to the following: the mainstream plasma power plants still use the technologies disclosed in patents such as CN2429752Y and CN2521510Y for pulverized coal ignition, which employs a water-cooled air plasma generator axially inserted into the burner for pulverized coal ignition. This method has the following main drawbacks: First, the requirements for pulverized coal are too high, preventing its widespread application. Second, relying on a single plasma generator to convert electrical energy into heat energy to ignite pulverized coal results in high power of the plasma generator and the plasma jet flame running parallel to the pulverized coal, leading to insufficient mixing and low ignition efficiency. Third, plasma generators currently widely use circulating water to cool the electrode heads, which results in a complex heat exchange system, large heat loss, high investment and maintenance costs, and the risk of water leakage from the electrode heads flooding the pulverized coal pipelines or even the coal mill. Fourth, most plasma generators are currently arranged coaxially with the burner across the burner bend, resulting in a long and heavy generator body that is inconvenient for inspection and maintenance.

[0006] Patent CN201526986U discloses a device and method for igniting pulverized coal using a non-axially arranged electric arc. This device utilizes cross-distributed plasma transfer arc anodes and cathodes to form a high-temperature region that intersects with the pulverized coal. While this solves the problem of insufficient mixing between the plasma jet and the pulverized coal, it still has the following drawbacks: 1. The plasma transfer arc has poor stability and is unreliable in operation; Second, the high power required to maintain the operation of the transfer arc increases energy consumption. Third, the system is complex and has high maintenance costs.

[0007] In response to the aforementioned technologies, the applicant has found that the current deep peak shaving and large fluctuations in power generation load in coal-fired power plants place higher demands on ignition and stable combustion. Therefore, it is necessary to provide a more efficient plasma pulverized coal ignition device to expand the range of coal types that can be adapted, improve efficiency, save costs, reduce maintenance difficulty, and at the same time reduce energy consumption and carbon emissions. Summary of the Invention

[0008] This invention addresses the shortcomings of existing technologies by providing a pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods. Multiple plasma generators are arranged inside the combustion device, and their synergistic effect gives the plasma combustion system a strong combustion control capability, providing stable conditions for the ignition, peak shaving, and safe operation of pulverized coal boilers. By arranging multiple plasma generators on the burner, the spatial layout of the plasma flame and pulverized coal is optimized. This improves thermal efficiency, reduces plasma generator power, and lowers the electrode head heat load, laying the foundation for prioritizing non-liquid cooling methods such as air cooling. This simplifies the plasma ignition system, improves ignition efficiency, expands the applicability of pulverized coal, and reduces energy consumption and maintenance costs.

[0009] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A pulverized coal combustion device based on a combination of multiple cooling methods includes a plasma generating unit and a burner unit, which are interconnected. The plasma generating unit includes a plasma generator and a plasma power supply, which are interconnected. The burner unit includes a burner body and a burner elbow. The burner body and the burner elbow are connected to each other. The end of the burner elbow away from the burner body is connected to the pulverized coal pipeline, and the outlet end of the burner body is connected to the boiler. Several plasma generators are placed on the burner body.

[0010] Furthermore, the burner body includes a central combustion cylinder, an outer combustion cylinder, and a combustion shell. Several plasma generators are placed on the central combustion cylinder. The axial portions of the central combustion cylinder and the outer combustion cylinder overlap. There is a radial gap between the central combustion cylinder and the outer combustion cylinder. There are radial gaps between the central combustion cylinder and the outer combustion cylinder and the combustion shell, respectively. Part of the pulverized coal gas flow passes through the gaps.

[0011] Furthermore, the angle between the axis of the plasma generator and the axis of the burner body is in the range of 0° to 90°.

[0012] Furthermore, the plasma generators are arranged on the same cross section perpendicular to the axis of the burner body, or the plasma generators are distributed on different cross sections perpendicular to the axis of the burner body.

[0013] Furthermore, several of the plasma generators are placed on the burner bend and the central combustion cylinder.

[0014] Furthermore, the angle between the plasma generator and the vertical plane of the centerline of the straight section of the burner bend ranges from -60° to +60°.

[0015] Furthermore, it includes an auxiliary unit connected to the plasma generating unit, the auxiliary unit including a plasma medium gas supply assembly, a plasma electrode head cooling assembly, and a pipeline assembly.

[0016] Furthermore, it includes an intelligent monitoring unit, which is connected to the plasma generating unit, the burner unit, and the auxiliary unit respectively; The intelligent monitoring unit includes components for burner wall temperature detection, flame monitoring, and plasma generator operating status information acquisition, as well as a parameter display and operation adjustment platform that aggregates data to the DCS central control terminal. The intelligent monitoring unit monitors the operating status of the plasma generator and the ignition parameters of the burner body in real time, and turns one or more plasma generators on or off according to the operating conditions.

[0017] Furthermore, the cooling medium for the electrode head of the plasma generator is compressed air.

[0018] Furthermore, the outlet jet of the plasma generator is configured with different lengths and rigidities to enhance mixing with pulverized coal according to different arrangement methods.

[0019] In summary, compared with the prior art, the beneficial effects of the above technical solution are: 1. This invention arranges multiple plasma generators inside the combustion equipment. Through their synergistic effect, the plasma combustion system possesses extremely strong combustion control capabilities, providing stable conditions for the ignition, peak shaving, and safe operation of pulverized coal boilers. By arranging multiple plasma generators on the burner, the spatial layout of the plasma flame and pulverized coal is optimized. This improves thermal energy utilization efficiency, reduces plasma generator power, and lowers the electrode head heat load, laying the foundation for prioritizing non-liquid cooling methods such as air cooling. This simplifies the composition of the plasma ignition system, improves ignition efficiency, and consequently expands the applicability of pulverized coal, reducing energy consumption and maintenance costs.

[0020] 2. In this invention, multiple plasma generators are arranged on the burner body, optimizing the temperature field of the high-temperature plasma jet and its spatial arrangement with the pulverized coal. This reduces the power of the plasma generators by improving thermal efficiency. Multiple plasma generators are also arranged at the burner bend and on the central combustion cylinder of the burner body. The plasma generators at the burner bend activate the pulverized coal, improving its combustibility. Compressed air cooling is preferred for the plasma generators; however, water cooling can be used to further increase generator power and expand the range of pulverized coal adaptability. The combustion system is simple, consumes little energy, has low operating and maintenance costs, and is adaptable to a wide range of coal types, showing promising application prospects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of the present invention; Figure 2 This is a side view of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure in Embodiment 2 of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Plasma generation unit; 11. Plasma generator; 12. Plasma power supply; 2. Burner unit; 21. Burner body; 211. Central combustion tube; 212. Peripheral combustion tube; 213. Combustion shell; 22. Burner elbow; 3. Intelligent monitoring unit; 4. Auxiliary unit. Detailed Implementation

[0023] The principles and features of the present invention are described below with reference to all the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0024] This invention discloses a pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods.

[0025] Reference Figures 1-3 As shown, a pulverized coal combustion device based on a combination of multiple cooling methods includes a plasma generating unit 1 and a burner unit 2, which are interconnected. The plasma generating unit 1 includes a plasma generator 11 and a plasma power supply 12, which are interconnected. It also includes the plasma generator 11, the plasma power supply 12 (including control and communication components), and connecting accessories between the two.

[0026] The burner unit 2 includes a burner body 21 and a burner elbow 22. The burner body 21 and the burner elbow 22 are connected to each other. The end of the burner elbow 22 away from the burner body 21 is connected to the pulverized coal pipeline. The outlet end of the burner body 21 is connected to the boiler. Several plasma generators 11 are placed on the burner body 21.

[0027] The angle between the axes of the plasma generator 11 and the burner body 21 ranges from 0° to 90°.

[0028] The plasma generator 11 is arranged on the same cross section perpendicular to the axis of the burner body 21, or the plasma generator 11 is distributed on different cross sections perpendicular to the axis of the burner body 21.

[0029] The preferred cooling medium for the electrode head of the plasma generator 11 is compressed air. The outlet jet of the plasma generator 11 is configured with different lengths and rigidities to enhance mixing with pulverized coal according to different arrangement methods.

[0030] The burner body 21 includes a central combustion cylinder 211, an outer combustion cylinder 212, and a combustion shell 213. Several plasma generators 11 are placed on the central combustion cylinder 211. In this embodiment, the several plasma generators 11 can be located in front of or behind the central combustion cylinder 212. The axial portion of the central combustion cylinder 211 and the outer combustion cylinder 212 overlaps. There is a radial gap between the central combustion cylinder 211 and the outer combustion cylinder 212. There are radial gaps between the central combustion cylinder 211 and the outer combustion cylinder 212 and the combustion shell 213, respectively. Part of the pulverized coal gas flow passes through the gaps.

[0031] Furthermore, several plasma generators 11 are placed on the burner elbow 22 and the central combustion cylinder 211. The plasma generators 11 are placed on the straight section of the burner elbow 22 at the pulverized coal inlet end. The angle between the plasma generator 11 and the vertical plane of the centerline of the straight section of the burner elbow 22 ranges from -60° to +60°.

[0032] Multiple plasma generators 11 can be arranged on the burner body 21 or burner elbow 22. Depending on the properties of the pulverized coal or the output of the burner, multiple or various plasma generators 11 can be arranged on the burner body 21 or burner elbow 22.

[0033] The pulverized coal combustion equipment also includes an auxiliary unit 4, which is connected to the plasma generation unit 1. The auxiliary unit 4 includes a plasma medium gas supply assembly, a plasma electrode head cooling assembly, and a pipeline assembly. Depending on different operating conditions and the arrangement and number of plasma generators 11, air cooling is preferred for the electrode head cooling method, but other cooling methods are not excluded.

[0034] The pulverized coal combustion equipment also includes an intelligent monitoring unit 3, which is connected to the plasma generation unit 1, the burner unit 2 and the auxiliary unit 4 respectively. The intelligent monitoring unit 3 includes components for burner wall temperature detection, flame monitoring and plasma generator 11 operation status information acquisition, as well as a parameter display and operation adjustment platform that aggregates data to the DCS central control terminal. The intelligent monitoring unit 3 monitors the operation status of the plasma generator 11 and the ignition parameters of the burner body 21 in real time, and turns one or more plasma generators 11 on or off according to the operating conditions.

[0035] In this invention, the spatial arrangement of multiple plasma generators 11 creates a high-temperature environment within the central combustion chamber 211 of the burner through the combined plasma jets. Compared to currently used plasma burners, the combined plasma jets have a higher core temperature, a wider coverage area, and more thorough mixing with pulverized coal, thus improving combustion efficiency and reducing energy consumption. Simultaneously, the combination of multiple plasma generators 11 reduces the power of a single generator, decreases the heat load on the electrode head, and allows air cooling to meet electrode cooling requirements. This eliminates the need for a cooling water unit in traditional plasma ignition systems, avoiding heat loss due to cooling water. This not only greatly simplifies the system composition and reduces operating and maintenance costs but also improves plasma thermal energy utilization efficiency and reduces energy consumption. Therefore, this invention has promising application prospects.

[0036] The following are preferred, but not limiting, technical solutions of the present invention to achieve the technical objectives and effects of the present invention.

[0037] As a preferred technical solution of the present invention, the arrangement of multiple plasma generators 11 on the pulverized coal burner body 21 is such that the angle between their axes and the burner axis is in the range of 0° to 90°, but is not limited to this value.

[0038] As a preferred technical solution of the present invention, the number of plasma generators 11 on the burner body 21 is at least one, and can be one, two, three, four, five or six, but is not limited to the listed values.

[0039] As a preferred technical solution of the present invention, multiple plasma generators 11 are arranged on the pulverized coal burner body 21. In order to enhance the ignition effect, for pulverized coal of poor quality, multiple additional plasma generators 11 are stacked on the burner bend 22 and the central combustion cylinder 211, with the angle between their axis and the vertical plane of the burner bend 22 axis within the range of ±60°, but not limited to this value.

[0040] As a preferred technical solution of the present invention, the number of plasma generators 11 on the burner elbow 22 is at least 2, and can be 2, 3, 4, 5 or 6, but is not limited to the listed values.

[0041] As a preferred technical solution of the present invention, the plasma generator 11 electrode head is preferably cooled by air cooling technology, and the cooling medium can be, but is not limited to, gaseous substances such as compressed air.

[0042] As a preferred technical solution of the present invention, the plasma generator 11 outlet jet is provided with different lengths and rigidities, which can enhance the mixing with pulverized coal and improve combustion efficiency according to different arrangement methods.

[0043] As a preferred technical solution of the present invention, the plasma generators 11 are arranged on the central combustion cylinder 211 of the pulverized coal burner, or between the central combustion cylinder 211 and the outer combustion cylinder 212, or on the outer combustion cylinder 212. The number and installation angle of the plasma generators 11 are selected according to the characteristics of pulverized coal and the output of the burner.

[0044] As a preferred technical solution of the present invention, the intelligent monitoring unit 3 monitors the operating status of the plasma generator 11 and the ignition parameters of the burner in real time, and turns one or more plasma generators 11 on or off according to the operating conditions.

[0045] As a preferred embodiment of the present invention, the combustion shell 213, the central combustion cylinder 211 and the outer combustion cylinder 212 of the pulverized coal burner are coaxially arranged.

[0046] As a preferred technical solution of the present invention, the axial portions of the central combustion cylinder 211 and the outer combustion cylinder 212 overlap and are provided with a radial gap to facilitate the introduction of pulverized coal airflow and achieve stratified combustion.

[0047] As a preferred technical solution of the present invention, the central combustion cylinder 211, the outer combustion cylinder 212 and the combustion shell 213 are radially provided with gaps, through which part of the pulverized coal airflow passes to cool the inner wall of the pulverized coal burner and prevent the device from being damaged due to excessive temperature.

[0048] As a preferred embodiment of the present invention, the pulverized coal burner elbow 22 is connected to the pulverized coal pipeline.

[0049] As a preferred technical solution of the present invention, the outlet of the pulverized coal burner body 21 is connected to the furnace of the pulverized coal power plant boiler.

[0050] The following two examples illustrate this further: Example 1 Reference Figure 1 and Figure 2 As shown, a pulverized coal combustion device based on a combination of multiple cooling methods includes a plasma generation unit 1, a burner unit 2, an intelligent monitoring unit 3, and an auxiliary unit 4.

[0051] The plasma generating unit 1 includes a plasma generator 11 and a plasma power supply 12.

[0052] The burner unit 2 includes a burner body 21 and a burner elbow 22. The burner body 21 includes a central combustion cylinder 211, an outer combustion cylinder 212 and a combustion shell 213.

[0053] The plasma generator 11 is inserted into the central combustion tube 211 of the burner, and the angle between the axis of the plasma generator 11 and the center line of the burner body 21 is 90° (perpendicular).

[0054] There are 4 plasma generators 11.

[0055] The plasma generator 11 electrode head is cooled by compressed air.

[0056] The auxiliary unit 4 is connected to the plasma generator 11 via a pipeline, providing the medium gas and cooling gas required for operation.

[0057] The burner body 21 is connected to the pulverized coal pipeline via the burner elbow 22.

[0058] The implementation principle of Example 1 is as follows: The aforementioned pulverized coal combustion equipment is used for igniting lignite or low-quality coal, with low-quality coal having a volatile matter content (Vdaf) of approximately 15%. Four plasma generators 11, each with a power of 20kW, are arranged in the central combustion chamber 211 of the burner body 21. The plasma jets generated by the four plasma generators 11 converge within the central combustion chamber 211, forming a high-temperature flow field. The flow field has a high central temperature and a large high-temperature coverage area, and it intersects perpendicularly with the pulverized coal entering the central combustion chamber 211, ensuring thorough mixing. Therefore, it can ignite the pulverized coal in the central combustion chamber 211, and subsequently ignite the pulverized coal in the outer chambers. Compared to the 120-160kW plasma generators 11 currently required for igniting lignite, the power is reduced by more than 50%, and the cooling water system is eliminated, further reducing operating and maintenance costs, resulting in significant energy savings and efficiency improvements. Currently, there is no mature technology for igniting low-quality coal using plasma ignition schemes, and oil guns are still used for ignition or stable combustion. This embodiment can ignite low-quality coal with a Vdaf content of about 15%, making it possible for the coal-fired power plant to save oil or operate without oil. Furthermore, by adjusting the number of plasma generators 11 or the power of a single plasma generator 11, the coal type adaptability and operational stability of the plasma combustion device can be greatly improved.

[0059] Example 2 Reference Figure 3 As shown, a pulverized coal combustion device based on a combination of multiple cooling methods includes a plasma generation unit 1, a burner unit 2, an intelligent monitoring unit 3, and an auxiliary unit 4.

[0060] The plasma generating unit 1 includes a plasma generator 11 and a plasma power supply 12.

[0061] The burner unit 2 includes a burner body 21 and a burner elbow 22. The burner body 21 includes a central combustion cylinder 211, an outer combustion cylinder 212 and a combustion shell 213.

[0062] The plasma generator 11 is inserted into the straight section of the pulverized coal inlet of the burner elbow 22. The angle between the axis of the plasma generator 11 and the center line of the straight section of the pulverized coal inlet of the burner elbow 22 is 90° (perpendicular). There are 4 units in total.

[0063] The plasma generator 11 is inserted into the central combustion tube 211 of the burner body 21. The angle between the axis of the plasma generator 11 and the center line of the burner body 21 is 90° (vertical). There are 4 units.

[0064] The plasma generator 11 arranged on the burner elbow is a pulverized coal activation generator, which generates highly chemically active and high-energy substances to mix with pulverized coal to excite pulverized coal molecules and improve their combustion reaction properties before entering the burner body 21.

[0065] The plasma generator 11 arranged on the burner body is a pulverized coal ignition generator, which generates high temperature to ignite the pulverized coal.

[0066] The electrode head of the plasma generator 11 is cooled by compressed air.

[0067] The auxiliary unit 4 is connected to the plasma generator 11 via a pipeline, providing the medium gas and cooling gas required for operation.

[0068] The burner body 21 is connected to the pulverized coal pipeline via the burner elbow 22.

[0069] The implementation principle of Example 2 is as follows: The aforementioned pulverized coal combustion equipment is used for igniting low-quality coal with a volatile matter content (Vdaf) < 15%. Four activation plasma generators 11, each with a power of 5kW, are arranged at the burner bend 22; four ignition plasma generators 11, each with a power of 20kW, are arranged in the central combustion chamber 211 of the burner body 21. The four activation generators pre-treat the pulverized coal, stimulating its chemical activity and making it easier to ignite. The plasma jets generated by the four ignition generators converge in the central combustion chamber 211 to form a high-temperature flow field, igniting the pulverized coal in the central combustion chamber 211, and subsequently igniting the pulverized coal in the outer combustion chamber 212. Currently, there is no mature technology for plasma ignition of low-quality coal; oil guns are still used for ignition or stable combustion. This embodiment can ignite low-quality coal with a Vdaf content of approximately 15%, providing the possibility for oil-saving or oil-free operation of this coal-fired power plant. Furthermore, by adjusting the number of plasma generators 11 or the power of a single plasma generator 11, the coal type adaptability and operational stability of the plasma combustion device can be improved.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pulverized coal combustion device based on a combination of multiple cooling methods, comprising a plasma generating unit (1) and a burner unit (2), wherein the plasma generating unit (1) and the burner unit (2) are interconnected, characterized in that: The plasma generating unit (1) includes a plasma generator (11) and a plasma power supply (12), and the plasma generator (11) and the plasma power supply (12) are connected to each other. The burner unit (2) includes a burner body (21) and a burner elbow (22). The burner body (21) and the burner elbow (22) are connected to each other. The end of the burner elbow (22) away from the burner body (21) is connected to the pulverized coal pipeline. The outlet end of the burner body (21) is connected to the boiler. Several plasma generators (11) are placed on the burner body (21).

2. The pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 1, characterized in that: The burner body (21) includes a central combustion cylinder (211), an outer combustion cylinder (212), and a combustion shell (213). Several plasma generators (11) are placed on the central combustion cylinder (211). The axial portions of the central combustion cylinder (211) and the outer combustion cylinder (212) overlap. There are radial gaps between the central combustion cylinder (211) and the outer combustion cylinder (212). There are radial gaps between the central combustion cylinder (211) and the outer combustion cylinder (212) and the combustion shell (213), respectively. Part of the pulverized coal gas flow passes through the gaps.

3. The pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 1, characterized in that: The angle between the axes of the plasma generator (11) and the burner body (21) is in the range of 0° to 90°.

4. A pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 1, characterized in that: The plasma generator (11) is arranged on the same cross section perpendicular to the axis of the burner body (21), or the plasma generator (11) is distributed on different cross sections perpendicular to the axis of the burner body (21).

5. A pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 2, characterized in that: Several of the plasma generators (11) are placed on the burner bend (22) and the central combustion tube (211).

6. A pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 5, characterized in that: The angle between the plasma generator (11) and the vertical plane of the center line of the straight section of the burner bend (22) is in the range of -60° to +60°.

7. A pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 1, characterized in that: It includes an auxiliary unit (4), which is connected to the plasma generating unit (1). The auxiliary unit (4) includes a plasma medium gas supply assembly, a plasma electrode head cooling assembly, and a pipeline assembly.

8. A pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 7, characterized in that: It includes an intelligent monitoring unit (3), which is connected to the plasma generating unit (1), the burner unit (2) and the auxiliary unit (4) respectively; The intelligent monitoring unit (3) includes components for burner wall temperature detection, flame monitoring and plasma generator (11) operation status information acquisition, as well as a parameter display and operation adjustment platform that aggregates data to the DCS central control terminal. The intelligent monitoring unit (3) monitors the operation status of the plasma generator (11) and the ignition parameters of the burner body (21) in real time, and turns on or off one or more plasma generators (11) according to the working conditions.

9. A pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 1, characterized in that: The electrode head cooling medium of the plasma generator (11) is compressed air or water.

10. A pulverized coal combustion device based on a comprehensive arrangement of multiple cooling methods according to claim 1, characterized in that: The plasma generator (11) has different lengths and rigidities in its outlet jet, which enhances the mixing with pulverized coal according to different arrangement methods.

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