Hydrogen-doped combustion system and method for coal-fired unit

Abstract

The invention provides a hydrogen-doped combustion system and method for a coal-fired unit. The system comprises a hydrogen-doped combustor, a hydrogen main pipeline unit, a flue gas temperature detection unit and a PLC control unit. The interior of the hydrogen-doped combustor is hollow to form a combustion chamber; a hydrogen passage, a combustion air passage, a mixer and a spray head which are communicated with a combustion chamber are arranged on the side wall of the hydrogen-doped combustor, a first inlet of the mixer is communicated with the combustion air passage, a second inlet of the mixer is communicated with the hydrogen passage, and an outlet of the mixer is communicated with the spray head; the cooling air passage is annularly arranged on the outer side of the spray head; hydrogen and combustion air are mixed in the mixer; an outlet of the hydrogen main pipeline unit is connected with the hydrogen passage; and a part of the flue gas temperature detection unit extends into the combustion chamber. The method has the technical effects that the carbon emission of the coal-fired unit can be effectively reduced, the combustion condition of the unit under low load is stabilized, and the flexibility of the boiler is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal-fired units, and in particular relates to a hydrogen-blended combustion system and method for a coal-fired unit. Background Art

[0002] Hydrogen energy is an important part of the future national energy system and an important carrier for energy users to achieve green and low-carbon transformation. Hydrogen energy is also a key development direction of my country's strategic emerging industries and future industries, and will play an important role in my country's energy transformation. The development of green hydrogen and hydrogen energy industries is of great strategic significance for my country to cope with environmental challenges, achieve low-carbon transformation, promote energy revolution, and ensure energy security. It will be an important means for my country to achieve carbon peak and carbon neutrality. First of all, green hydrogen is a pure zero-carbon new energy. When it burns, it only produces water, achieving zero carbon dioxide emissions from the source. Secondly, green hydrogen can effectively absorb unstable electricity such as wind power and photovoltaic power generation, as well as other surplus trough electricity, realize distributed hydrogen production and "hydrogen-electricity interaction", build a "distributed smart energy system", undertake the important task of "seasonal peak-shaving power generation", and realize the intelligent interconnection of hydrogen-electricity energy. The main difficulty restricting the development of the green hydrogen industry at present is the difficulty in storing and transporting hydrogen. After hydrogen production, it is directly mixed and burned in the boiler, avoiding the transportation and storage of hydrogen.

[0003] Since the combustion characteristics of hydrogen are different from those of pulverized coal, it has the characteristics of fast combustion speed and high flame temperature. Hydrogen is introduced into the boiler furnace for combustion. Currently, there is no hydrogen-blended combustion system designed for coal-fired units. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and provide a new technical solution for a hydrogen-blended combustion system and method for a coal-fired unit.

[0005] According to a first aspect of the present invention, there is provided a hydrogen-blended combustion system for a coal-fired unit, comprising a hydrogen-blended burner, a hydrogen main pipeline unit, a flue gas temperature detection unit and a PLC control unit;

[0006] The hydrogen-blended burner is located below the pulverized coal burner, and the interior of the hydrogen-blended burner is hollow to form a combustion chamber; a hydrogen passage, a combustion air passage, a cooling air passage, a mixer and a nozzle connected to the combustion chamber are provided on the side wall of the hydrogen-blended burner, wherein a first inlet of the mixer is connected to the combustion air passage, a second inlet of the mixer is connected to the hydrogen passage, an outlet of the mixer is connected to the nozzle, and an opening of the nozzle faces the combustion chamber; the cooling air passage is arranged in a ring on the outside of the nozzle; the hydrogen input by the hydrogen passage and the combustion air input by the combustion air passage are mixed in the mixer and burnt in the combustion chamber to form flue gas, and the cold air input by the cooling air passage is used to reduce the temperature of the flue gas in the combustion chamber;

[0007] The outlet of the hydrogen main pipeline unit is connected to the hydrogen passage to deliver hydrogen into the combustion chamber;

[0008] A portion of the flue gas temperature detection unit extends into the combustion chamber to detect the flue gas temperature in the combustion chamber;

[0009] The PLC control unit is connected to the flue gas temperature detection unit and is used to control the amount of cold air input by the cooling air passage according to the flue gas temperature value detected by the flue gas temperature detection unit to maintain the flue gas temperature in the combustion chamber within a preset range.

[0010] Optionally, the hydrogen passage, the combustion air passage, the cooling air passage, the mixer and the nozzle constitute an arrangement unit;

[0011] The hydrogen-mixing burner is cylindrical; a plurality of the arrangement units are distributed at intervals along the circumferential direction of the hydrogen-mixing burner.

[0012] Optionally, the inner surface of the combustion chamber is paved with refractory material.

[0013] Optionally, the hydrogen main pipeline unit includes a hydrogen production storage device, an air compressor, a check valve and a flow regulating valve, a flow meter and a connecting pipeline; one end of the connecting pipeline is connected to the hydrogen storage device, and the other end is connected to the hydrogen blending burner;

[0014] The connecting pipeline is provided with an air compressor, a check valve and a flow regulating valve in sequence along the direction from close to the hydrogen production storage device to far away from the hydrogen production storage device; the flow meter is provided in the connecting pipeline and is located between the flow regulating valve and the hydrogen blending burner;

[0015] The air compressor, the check valve, the flow regulating valve and the flow meter are all connected to the PLC control unit.

[0016] Optionally, the hydrogen production and storage device produces and stores hydrogen by photovoltaic power generation or wind power generation in the factory.

[0017] Optionally, the hydrogen-blended combustion system of the coal-fired unit further includes a solenoid valve;

[0018] The solenoid valve is arranged on the connecting pipeline and is located between the hydrogen production storage device and the air compressor;

[0019] The solenoid valve is connected to the PLC control unit.

[0020] Optionally, the hydrogen blending combustion system of the coal-fired unit further includes a first pressure gauge and a second pressure gauge;

[0021] The first pressure gauge and the second pressure gauge are both arranged in the connecting pipeline, and the first pressure gauge is located between the solenoid valve and the air compressor, and the second pressure gauge is located between the air compressor and the check valve;

[0022] The first pressure gauge and the second pressure gauge are connected to the PLC control unit respectively.

[0023] Optionally, the hydrogen blending combustion system of the coal-fired unit further includes a third pressure gauge;

[0024] The third pressure gauges are all arranged in the connecting pipeline, and the third pressure gauges are located between the flow regulating valve and the flow meter;

[0025] The third pressure gauge is connected to the PLC control unit.

[0026] Optionally, the flue gas temperature detection unit is a thermocouple.

[0027] Optionally, the preset range is 1000°C-1500°C.

[0028] According to a second aspect of the present invention, there is provided a method for hydrogen-blended combustion of a coal-fired unit, comprising the following steps:

[0029] The hydrogen is sequentially transported to the combustion chamber through the hydrogen main line unit and the hydrogen passage; at the same time, the combustion air is sequentially transported to the combustion chamber through the branch pipes led out of the secondary air duct of the coal-fired boiler and the combustion air passage, and the cooling air is sequentially transported to the combustion chamber through the branch pipes led out of the primary air duct of the coal-fired boiler and the cooling air passage;

[0030] The PLC control unit controls the opening of the flow regulating valve of the hydrogen main line unit, so that hydrogen and combustion air enter the hydrogen blending burner for mixing and combustion according to the preset ratio;

[0031] A flue gas temperature detection unit is used to detect the flue gas temperature generated in the combustion chamber;

[0032] If the flue gas temperature exceeds a preset range, the cooling air flow rate of the cooling air passage is adjusted through the PLC control unit, and the flue gas temperature in the combustion chamber is adjusted through the cooling air to maintain the flue gas temperature in the combustion chamber within the preset range.

[0033] A technical effect of the present invention is:

[0034] In the embodiment of the present application, the coal-fired unit hydrogen-blended combustion system and method can effectively reduce the carbon emissions of the coal-fired unit, stabilize the combustion conditions of the unit at low load, and increase the flexibility of the boiler through hydrogen-blended combustion. Moreover, the coal-fired unit hydrogen-blended combustion system has the advantages of fast combustion speed and high flame temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a hydrogen-blended combustion system for a coal-fired unit according to an embodiment of the present invention;

[0036] Figure 2 The present invention is a schematic structural diagram of a hydrogen-blended burner in a hydrogen-blended combustion system for a coal-fired unit according to an embodiment of the present invention.

[0037] In the figure: 1. hydrogen-blended burner; 101. combustion chamber; 102. hydrogen passage; 103. combustion air passage; 104. cooling air passage; 105. mixer; 106. nozzle; 21. hydrogen storage device; 22. air compressor; 23. check valve; 24. flow regulating valve; 25. flow meter; 26. connecting pipeline; 27. solenoid valve; 281. first pressure gauge; 282. second pressure gauge; 283. third pressure gauge; 3. flue gas temperature detection unit; 4. PLC control unit. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0039] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0040] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] According to a first aspect of the present invention, see Figure 1 and Figure 2 , provides a hydrogen-blended combustion system for a coal-fired unit, which can enable hydrogen to burn stably in a coal-fired furnace.

[0044] Specifically, the hydrogen-blended combustion system of the coal-fired unit comprises a hydrogen-blended burner 1, a hydrogen main pipeline unit, a flue gas temperature detection unit 3 and a PLC control unit 4;

[0045] The hydrogen-blended burner 1 is located below the pulverized coal burner, and the interior of the hydrogen-blended burner 1 is hollow to form a combustion chamber 101; the side wall of the hydrogen-blended burner 1 is provided with a hydrogen passage 102, a combustion air passage 103, a cooling air passage 104, a mixer 105 and a nozzle 106 connected to the combustion chamber 101, wherein a first inlet of the mixer 105 is connected to the combustion air passage 103, a second inlet of the mixer 105 is connected to the hydrogen passage 102, an outlet of the mixer 105 is connected to the nozzle 106, and the nozzle 106 is connected to the combustion air passage 103. The opening faces the combustion chamber 101; the cooling air passage 104 is arranged in a circle on the outside of the nozzle 106; the combustion air passage 103 is arranged in a circle on the outside of the hydrogen passage 102 and supplies air along the axial direction of the burner; the cooling air passage 104 is arranged in a circle on the outside of the combustion chamber 101; the hydrogen input from the hydrogen passage 102 and the combustion air input from the combustion air passage 103 are mixed in the mixer 105 and burn in the combustion chamber to form flue gas, and the cold air input from the cooling air passage 104 is used to reduce the temperature of the flue gas in the combustion chamber 101;

[0046] The outlet of the hydrogen main pipeline unit is connected to the hydrogen passage 102 to deliver hydrogen into the combustion chamber 101;

[0047] Part of the flue gas temperature detection unit 3 extends into the combustion chamber 101 to detect the flue gas temperature in the combustion chamber 101;

[0048] The PLC control unit 4 is connected to the flue gas temperature detection unit 3 and is used to control the amount of cold air input by the cooling air passage 104 according to the flue gas temperature value detected by the flue gas temperature detection unit 3 to maintain the flue gas temperature in the combustion chamber 101 within a preset range.

[0049] In the embodiment of the present application, the coal-fired unit hydrogen-blended combustion system and method can effectively reduce the carbon emissions of the coal-fired unit, stabilize the combustion conditions of the unit at low load, and increase the flexibility of the boiler through hydrogen-blended combustion. Moreover, the coal-fired unit hydrogen-blended combustion system has the advantages of fast combustion speed and high flame temperature.

[0050] It should be noted that since the temperature of hydrogen combustion is very high, reaching 2000-3000°C in the combustion chamber 101, a cooling air passage 104 is arranged on the outside of the hydrogen passage 102 and the combustion air passage 103, and the temperature in the combustion chamber 101 is detected by the flue gas temperature detection unit 3 and the cooling air flow rate of the cooling air passage 104 is controlled in real time to control the temperature of the flue gas after combustion at about 1500°C and then spray it into the furnace, thereby better ensuring the stability and safety of the boiler operation.

[0051] Optionally, the hydrogen passage 102, the combustion air passage 103, the cooling air passage 104, the mixer 105 and the nozzle constitute an arrangement unit;

[0052] The hydrogen-mixing burner is cylindrical; a plurality of the arrangement units are distributed at intervals along the circumferential direction of the hydrogen-mixing burner.

[0053] Exemplarily, the number of arrangement units is 6-8, and the opening of the nozzle is perpendicular to the vertical axis of the burner, or forms a 45° angle with the vertical axis of the burner and sprays toward the combustion chamber, so that the hydrogen can be better dispersed and better mixed with the injected air to facilitate complete combustion.

[0054] Optionally, the inner surface of the combustion chamber 101 is paved with refractory material, which helps to ensure the safety of the hydrogen-blended burner 1 and prevent the combustion process of hydrogen from damaging the inner surface of the combustion chamber 101 .

[0055] Optionally, the hydrogen main pipeline unit includes a hydrogen production storage device 21, an air compressor 22, a check valve 23, a flow regulating valve 24, a flow meter 25 and a connecting pipeline 26; one end of the connecting pipeline 26 is connected to the hydrogen storage device 21, and the other end is connected to the hydrogen blending burner 1;

[0056] The connecting pipeline 26 is provided with an air compressor 22, a check valve 23 and a flow regulating valve 24 in sequence from close to the hydrogen production storage device 21 to far away from the hydrogen production storage device 21; the flow meter 25 is provided in the connecting pipeline 26 and is located between the flow regulating valve 24 and the hydrogen blending burner 1;

[0057] The air compressor 22 , the check valve 23 , the flow regulating valve 24 and the flow meter 25 are all connected to the PLC control unit 4 .

[0058] In the above embodiment, the hydrogen main line unit helps to ensure safe and stable transportation of hydrogen, thereby helping to ensure the safety and stability of the hydrogen combustion process.

[0059] Optionally, the hydrogen production and storage device 21 uses photovoltaic power generation or wind power generation in the plant area to prepare and store hydrogen. The hydrogen produced by the hydrogen production and storage device 21 can be directly used for combustion in coal-fired boilers, or it can be stored for emergency use. The hydrogen production and storage device 21 helps to make full use of unstable electricity.

[0060] Optionally, the hydrogen-blended combustion system of the coal-fired unit further includes a solenoid valve 27;

[0061] The solenoid valve 27 is disposed on the connecting pipeline 26 and is located between the hydrogen production storage device 21 and the air compressor 22;

[0062] The solenoid valve 27 is connected to the PLC control unit 4 .

[0063] In the above embodiment, the PLC control unit 4 controls the opening or closing of the connecting pipeline 26 through the solenoid valve 27, which helps to transport the hydrogen production storage device 21 to the hydrogen blending burner 1 through the connecting pipeline 26, and the operation is simple.

[0064] Optionally, the coal-fired unit hydrogen blending combustion system further includes a first pressure gauge 281 and a second pressure gauge 282;

[0065] The first pressure gauge 281 and the second pressure gauge 282 are both arranged in the connecting pipeline 26, and the first pressure gauge 281 is located between the solenoid valve 27 and the air compressor 22, and the second pressure gauge 282 is located between the air compressor 22 and the check valve 23; that is, the first pressure gauge 281 is located at the inlet of the air compressor 22, and the second pressure gauge 282 is located at the outlet of the air compressor 22;

[0066] The first pressure gauge 281 and the second pressure gauge 282 are connected to the PLC control unit 4 respectively.

[0067] In the above-mentioned implementation manner, the first pressure gauge 281 and the second pressure gauge 282 respectively detect the pressure at the inlet and outlet of the air compressor 22 , which helps to ensure the stability of the operation of the air compressor 22 .

[0068] Optionally, the coal-fired unit hydrogen blending combustion system further includes a third pressure gauge 283;

[0069] The third pressure gauge 283 is disposed in the connecting pipeline 26 , and the third pressure gauge 283 is located between the flow regulating valve 24 and the flow meter 25 ;

[0070] The third pressure gauge 283 is connected to the PLC control unit 4 .

[0071] In the above embodiment, the third pressure gauge 283 is located upstream of the flow meter 25 , so that the third pressure gauge 283 can accurately measure the pressure at the outlet of the flow control valve 24 .

[0072] Optionally, the flue gas temperature detection unit 3 is a thermocouple, which helps the flue gas temperature detection unit 3 to accurately and conveniently detect the flue gas temperature in the combustion chamber 101 .

[0073] Optionally, the preset range is 1000° C.-1500° C. A lower flue gas temperature helps to ensure better stability of boiler operation when the flue gas enters the boiler.

[0074] According to a second aspect of the present invention, there is provided a method for hydrogen-blended combustion of a coal-fired unit, comprising the following steps:

[0075] Hydrogen is sequentially transported to the combustion chamber 101 through the hydrogen main pipeline unit and the hydrogen passage 102; at the same time, combustion air is sequentially transported to the combustion chamber 101 through the branch pipeline led out of the secondary air duct of the coal-fired boiler and the combustion air passage 103, and cooling air is sequentially transported to the combustion chamber 101 through the branch pipeline led out of the primary air duct of the coal-fired boiler and the cooling air passage 104;

[0076] The PLC control unit 4 controls the opening of the flow regulating valve 24 of the hydrogen main line unit, so that the hydrogen and the combustion air enter the hydrogen blending burner 1 according to a preset ratio for mixing and combustion;

[0077] The flue gas temperature detection unit 3 is used to detect the flue gas temperature generated in the combustion chamber 101;

[0078] If the flue gas temperature exceeds a preset range, the cooling air flow rate of the cooling air passage 104 is adjusted by the PLC control unit 4, and the flue gas temperature in the combustion chamber 101 is adjusted by the cooling air to maintain the flue gas temperature in the combustion chamber 101 within a preset range.

[0079] In the above embodiment, the hydrogen-blended combustion method of the coal-fired unit is reasonably designed. Through hydrogen-blended combustion, it can effectively reduce the carbon emissions of the coal-fired unit, stabilize the combustion conditions of the unit at low load, and increase the flexibility of the boiler. Moreover, the hydrogen-blended combustion method of the coal-fired unit has the advantages of fast combustion speed and high flame temperature.

[0080] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A hydrogen-blended combustion system for a coal-fired unit, characterized in that: It includes a hydrogen blending burner, a hydrogen main pipeline unit, a flue gas temperature detection unit and a PLC control unit; The hydrogen-blended burner is located below the pulverized coal burner, and the interior of the hydrogen-blended burner is hollow to form a combustion chamber; a hydrogen passage, a combustion air passage, a cooling air passage, a mixer and a nozzle connected to the combustion chamber are provided on the side wall of the hydrogen-blended burner, wherein a first inlet of the mixer is connected to the combustion air passage, a second inlet of the mixer is connected to the hydrogen passage, an outlet of the mixer is connected to the nozzle, and an opening of the nozzle faces the combustion chamber; the cooling air passage is arranged in a ring on the outside of the nozzle; the hydrogen input by the hydrogen passage and the combustion air input by the combustion air passage are mixed in the mixer and burnt in the combustion chamber to form flue gas, and the cold air input by the cooling air passage is used to reduce the temperature of the flue gas in the combustion chamber; The outlet of the hydrogen main pipeline unit is connected to the hydrogen passage to deliver hydrogen into the combustion chamber; A portion of the flue gas temperature detection unit extends into the combustion chamber to detect the flue gas temperature in the combustion chamber; The PLC control unit is connected to the flue gas temperature detection unit and is used to control the amount of cold air input by the cooling air passage according to the flue gas temperature value detected by the flue gas temperature detection unit to maintain the flue gas temperature in the combustion chamber within a preset range.

2. The hydrogen-blended combustion system for coal-fired units according to claim 1, characterized in that: The hydrogen passage, combustion air passage, cooling air passage, mixer and nozzle constitute an arrangement unit; The hydrogen-mixing burner is cylindrical; a plurality of the arrangement units are distributed at intervals along the circumferential direction of the hydrogen-mixing burner.

3. The hydrogen-blended combustion system for coal-fired units according to claim 1, characterized in that: The hydrogen main pipeline unit includes a hydrogen production storage device, an air compressor, a check valve and a flow regulating valve, a flow meter and a connecting pipeline; one end of the connecting pipeline is connected to the hydrogen storage device, and the other end is connected to the hydrogen blending burner; The connecting pipeline is provided with an air compressor, a check valve and a flow regulating valve in sequence along the direction from close to the hydrogen production storage device to far away from the hydrogen production storage device; the flow meter is provided in the connecting pipeline and is located between the flow regulating valve and the hydrogen blending burner; The air compressor, the check valve, the flow regulating valve and the flow meter are all connected to the PLC control unit.

4. The hydrogen-blended combustion system for coal-fired units according to claim 3, characterized in that: The hydrogen production and storage device prepares and stores hydrogen by photovoltaic power generation or wind power generation in the factory area.

5. The hydrogen-blended combustion system for coal-fired units according to claim 4, characterized in that: Also includes a solenoid valve; The solenoid valve is arranged on the connecting pipeline and is located between the hydrogen production storage device and the air compressor; The solenoid valve is connected to the PLC control unit.

6. The hydrogen-blended combustion system for coal-fired units according to claim 5, characterized in that: Also included is a first pressure gauge and a second pressure gauge; The first pressure gauge and the second pressure gauge are both arranged in the connecting pipeline, and the first pressure gauge is located between the solenoid valve and the air compressor, and the second pressure gauge is located between the air compressor and the check valve; The first pressure gauge and the second pressure gauge are connected to the PLC control unit respectively.

7. The hydrogen-blended combustion system for coal-fired units according to claim 6, characterized in that: Also included is a third pressure gauge; The third pressure gauges are all arranged in the connecting pipeline, and the third pressure gauges are located between the flow regulating valve and the flow meter; The third pressure gauge is connected to the PLC control unit.

8. The hydrogen-blended combustion system for coal-fired units according to claim 1, characterized in that: The flue gas temperature detection unit is a thermocouple.

9. The hydrogen-blended combustion system for coal-fired units according to claim 1, characterized in that: The preset range is 1000°C-1500°C.

10. A method for hydrogen-blended combustion of a coal-fired unit, characterized in that: The steps include: The hydrogen is sequentially transported to the combustion chamber through the hydrogen main line unit and the hydrogen passage; at the same time, the combustion air is sequentially transported to the combustion chamber through the branch pipes led out of the secondary air duct of the coal-fired boiler and the combustion air passage, and the cooling air is sequentially transported to the combustion chamber through the branch pipes led out of the primary air duct of the coal-fired boiler and the cooling air passage; The PLC control unit controls the opening of the flow regulating valve of the hydrogen main line unit, so that hydrogen and combustion air enter the hydrogen blending burner for mixing and combustion according to the preset ratio; A flue gas temperature detection unit is used to detect the flue gas temperature generated in the combustion chamber; If the flue gas temperature exceeds a preset range, the cooling air flow rate of the cooling air passage is adjusted through the PLC control unit, and the flue gas temperature in the combustion chamber is adjusted through the cooling air to maintain the flue gas temperature in the combustion chamber within the preset range.

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