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

Abstract

The application provides a coal-fired unit hydrogen-doped combustion system and method, which comprises a hydrogen-doped combustor, a hydrogen main pipeline unit, a flue gas temperature detection unit and a PLC control unit; the hydrogen-doped combustor is internally hollow to form a combustion chamber; a hydrogen passage, a combustion air passage, a mixer and a nozzle which are communicated with the combustion chamber are arranged on the side wall of the hydrogen-doped combustor, wherein the first inlet of the mixer is communicated with the combustion air passage, the second inlet of the mixer is communicated with the hydrogen passage, and the outlet of the mixer is communicated with the nozzle; the cooling air passage is annularly arranged outside the nozzle; hydrogen and combustion air are mixed in the mixer; the outlet of the hydrogen main pipeline unit is connected with the hydrogen passage; and part of the flue gas temperature detection unit extends into the combustion chamber. One technical effect of the application is that the carbon emission of the coal-fired unit can be effectively reduced, the combustion condition of the unit at low load can be stabilized, and the flexibility of the boiler can be increased.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal-fired units, and particularly relates to a hydrogen-doped combustion system and method for a coal-fired unit. BACKGROUND

[0002] Hydrogen energy is an important part of the future national energy system and an important carrier for realizing green and low-carbon transformation of energy terminals. Hydrogen energy is also a strategic emerging industry and a future industry development direction in China, and will play an important role in China's energy transformation. Developing green hydrogen and hydrogen energy industry has great strategic significance for China to cope with environmental challenges, realize low-carbon transformation, promote energy revolution, and ensure energy security, and will be an important means for China to achieve carbon peak and carbon neutrality. First, green hydrogen is a pure zero-carbon new energy, and its combustion only produces water, achieving zero carbon dioxide emission from the source. Second, green hydrogen can effectively consume unstable power such as wind power and photovoltaic power, as well as other surplus valley power, realize distributed hydrogen production and "hydrogen-electricity interaction", build a "distributed intelligent energy system", and undertake the task of "seasonal peak shaving", and realize hydrogen and electricity energy intelligent interconnection. The main difficulty currently restricting the development of green hydrogen industry is the difficulty of hydrogen storage and transportation. Direct hydrogen doping into the boiler after hydrogen production avoids the transportation and storage of hydrogen.

[0003] Due to the different combustion characteristics of hydrogen and coal powder, hydrogen has the characteristics of fast combustion speed and high flame temperature. There is no hydrogen-doped combustion system designed for coal-fired units at present. SUMMARY

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

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

[0006] The hydrogen-doped burner is located below the coal powder burner, and the inside of the hydrogen-doped burner is hollow to form a combustion chamber. A hydrogen passage, a combustion air passage, a cooling air passage, a mixer, and a spray head are arranged on the side wall of the hydrogen-doped burner and communicate with the combustion chamber. The first inlet of the mixer communicates with the combustion air passage, the second inlet of the mixer communicates with the hydrogen passage, the outlet of the mixer communicates with the spray head, and the opening of the spray head faces the combustion chamber. The cooling air passage is arranged outside the spray head. Hydrogen input from the hydrogen passage and combustion air input from the combustion air passage are mixed in the mixer and burned in the combustion chamber to form flue gas, and cooling air input from 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 with the hydrogen passage to send hydrogen into the combustion chamber;

[0008] Part 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 with the flue gas temperature detection unit 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, so as 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-doped burner is in a cylindrical shape; and a plurality of arrangement units are distributed along the circumferential direction of the hydrogen-doped burner.

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

[0013] Optionally, the hydrogen main pipeline unit comprises a hydrogen production and 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 with the hydrogen storage device, and the other end is connected with the hydrogen-doped burner.

[0014] The connecting pipeline is sequentially provided with the air compressor, the check valve and the flow regulating valve in the direction from close to the hydrogen production and storage device to far away from the hydrogen production and storage device; and the flow meter is arranged in the connecting pipeline and located between the flow regulating valve and the hydrogen-doped burner.

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

[0016] Optionally, the hydrogen production and storage device uses on-site photovoltaic power generation or wind power generation to produce and store hydrogen.

[0017] Optionally, the coal-fired unit hydrogen-doped combustion system further comprises an electromagnetic valve.

[0018] The electromagnetic valve is arranged in the connecting pipeline and located between the hydrogen production and storage device and the air compressor.

[0019] The electromagnetic valve is connected with the PLC control unit.

[0020] Optionally, the coal-fired unit hydrogen-doped combustion system further comprises a first pressure gauge and a second pressure gauge.

[0021] The first pressure gauge and the second pressure gauge are arranged on the connecting pipeline, and the first pressure gauge is located between the electromagnetic 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 with the PLC control unit respectively.

[0023] Optionally, the coal-fired unit hydrogen-doped combustion system further comprises a third pressure gauge.

[0024] The third pressure gauge is arranged on the connecting pipeline, and the third pressure gauge is located between the flow regulating valve and the flow meter.

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

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

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

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

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

[0030] The opening degree of the flow regulating valve of the hydrogen main pipeline unit is controlled by the PLC control unit, so that the hydrogen and the combustion air enter the hydrogen-doped combustor for mixing and combustion according to a preset ratio.

[0031] The flue gas temperature generated in the combustion chamber is detected by the flue gas temperature detection unit.

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

[0033] One technical effect of the present application is that:

[0034] In the embodiments of the present application, the coal-fired unit hydrogen-doped combustion system and method can effectively reduce the carbon emission of the coal-fired unit, stabilize the combustion condition of the unit at low load, and increase the flexibility of the boiler by hydrogen-doped combustion. Moreover, the coal-fired unit hydrogen-doped combustion system has the advantages of fast combustion speed and high flame temperature. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 Figure 1 is a structural schematic diagram of a hydrogen-doped combustion system of a coal-fired unit according to an embodiment of the present application.

[0036] Figure 2 Figure 2 is a structural schematic diagram of a hydrogen-doped burner of a hydrogen-doped combustion system of a coal-fired unit according to an embodiment of the present application.

[0037] In the figure: 1, hydrogen-doped 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, electromagnetic 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 the relative arrangement of the components and steps set forth in the embodiments, numerical expressions, and numerical values are not limiting to the scope of the present application unless specifically stated otherwise.

[0039] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. The embodiments described below are exemplary only, and are not intended to limit the present application in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of the present application.

[0040] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0041] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0042] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0043] According to the first aspect of the present application, referring to Figure 1 and Figure 2 , a coal-fired unit hydrogen-doped combustion system is provided, which can make hydrogen burn stably in the coal-fired furnace.

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

[0045] The hydrogen-doped burner 1 is located below the pulverized coal burner, and the hydrogen-doped burner 1 is internally hollow to form a combustion chamber 101; a hydrogen gas passage 102, a combustion air passage 103, a cooling air passage 104, a mixer 105 and a spray head 106 are arranged on the side wall of the hydrogen-doped burner 1 and communicate with the combustion chamber 101, wherein the first inlet of the mixer 105 communicates with the combustion air passage 103, the second inlet of the mixer 105 communicates with the hydrogen gas passage 102, the outlet of the mixer 105 communicates with the spray head 106, and the opening of the spray head 106 faces the combustion chamber 101; the cooling air passage 104 is annularly arranged outside the spray head 106; the combustion air passage 103 is annularly arranged outside the hydrogen gas passage 102 and blows air along the axial direction of the burner; the cooling air passage 104 is annularly arranged outside the combustion chamber 101; hydrogen gas input by the hydrogen gas passage 102 and combustion air input by the combustion air passage 103 are mixed in the mixer 105 and combusted in the combustion chamber to form flue gas, and cooling air input by 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 gas main pipeline unit is connected with the hydrogen gas passage 102 to input hydrogen gas into the combustion chamber 101.

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

[0048] The PLC control unit 4 is connected with the flue gas temperature detection unit 3 and is used to control the amount of cooling 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, the coal-fired unit hydrogen-doped combustion system and method can effectively reduce the carbon emission of the coal-fired unit, stabilize the combustion condition of the unit at low load and increase the flexibility of the boiler by means of hydrogen-doped combustion. Moreover, the coal-fired unit hydrogen-doped combustion system has the advantages of fast combustion speed and high flame temperature.

[0050] It should be noted that the temperature of hydrogen combustion is very high, and the temperature in the combustion chamber 101 can reach 2000-3000℃, so the cooling air passage 104 is arranged outside the hydrogen gas passage 102 and the combustion air passage 103, the temperature in the combustion chamber 101 is detected by the flue gas temperature detection unit 3, and the flow of cooling air of the cooling air passage 104 is controlled in real time to control the temperature of the flue gas after combustion to about 1500℃, and then the flue gas is sprayed 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-doped burner is in a cylindrical shape; and a plurality of arrangement units are distributed along the circumferential direction of the hydrogen-doped burner.

[0053] Optionally, the number of arrangement units is 6-8; the opening of the nozzle is perpendicular to the axis of the burner in the vertical direction, or forms an angle of 45° with the axis of the burner in the vertical direction and sprays into the combustion chamber, so that the hydrogen is better dispersed and mixed with the sprayed air, facilitating sufficient combustion.

[0054] Optionally, the inner surface of the combustion chamber 101 is paved with refractory material. This helps to ensure the safety of the hydrogen-doped burner 1 and avoid damage to the inner surface of the combustion chamber 101 during the hydrogen combustion process.

[0055] Optionally, the hydrogen main pipeline unit comprises a hydrogen production and storage device 21, an air compressor 22, a check valve 23 and 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-doped burner 1;

[0056] The connecting pipeline 26 is sequentially provided with the air compressor 22, the check valve 23 and the flow regulating valve 24 from the direction close to the hydrogen production and storage device 21 to the direction away from the hydrogen production and storage device 21; the flow meter 25 is arranged on the connecting pipeline 26 and located between the flow regulating valve 24 and the hydrogen-doped burner 1;

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

[0058] In the above embodiment, the hydrogen main pipeline unit helps to ensure the safe and stable delivery 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 on-site photovoltaic power generation or wind power generation to produce and store hydrogen. The hydrogen produced by the hydrogen production and storage device 21 can be directly used for combustion of the coal-fired boiler, or can be stored for future use. The hydrogen production and storage device 21 helps to make full use of unstable power.

[0060] Optionally, the coal-fired unit hydrogen-doped combustion system further comprises an electromagnetic valve 27;

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

[0062] The electromagnetic valve 27 is connected with 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 electromagnetic valve 27, which helps to deliver the hydrogen storage device 21 to the hydrogen-doped combustor 1 through the connecting pipeline 26, and the operation is simple.

[0064] Optionally, the coal-fired unit hydrogen-doped combustion system further comprises 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 on the connecting pipeline 26, and the first pressure gauge 281 is located between the electromagnetic 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 both arranged on the connecting pipeline 26, and the first pressure gauge 281 is located between the electromagnetic 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.

[0067] In the above embodiment, 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-doped combustion system further comprises a third pressure gauge 283.

[0069] The third pressure gauge 283 is arranged on 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 with 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 accurately measures the pressure at the outlet of the flow regulating valve 24.

[0072] Optionally, the flue gas temperature detection unit 3 is a thermocouple. This 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 1000-1500℃. The flue gas temperature is relatively low, which helps to ensure the stability of the operation of the boiler when the flue gas enters the boiler.

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

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

[0076] The opening of the flow regulating valve 24 of the hydrogen main pipeline unit is controlled by the PLC control unit 4, so that the hydrogen and the combustion air are mixed and combusted in the hydrogen-doped combustor 1 according to a preset ratio;

[0077] The flue gas temperature in the combustion chamber 101 is detected by the flue gas temperature detection unit 3;

[0078] If the flue gas temperature exceeds the preset range, the cooling air flow 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 the preset range.

[0079] In the above embodiment, the hydrogen-doped combustion method for the coal-fired unit is reasonable in design, and can effectively reduce the carbon emission of the coal-fired unit, stabilize the combustion condition of the unit at low load, and increase the flexibility of the boiler by hydrogen-doped combustion. Moreover, the hydrogen-doped combustion method for the coal-fired unit has the advantages of fast combustion speed and high flame temperature.

[0080] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present application, and these modifications and improvements are also considered to be within the protection scope of the present application.

Claims

1. A hydrogen-blended combustion system for a coal-fired power unit, characterized in that, Includes a hydrogen-blended burner, a main hydrogen 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 its interior is hollow, forming a combustion chamber. The sidewall of the hydrogen-blended burner is equipped with a hydrogen passage, a combustion air passage, a cooling air passage, a mixer, and a nozzle, all connected to the combustion chamber. The first inlet of the mixer is connected to the combustion air passage, the second inlet of the mixer is connected to the hydrogen passage, and the outlet of the mixer is connected to the nozzle. The nozzle's opening faces the combustion chamber. The cooling air passage is arranged around the outside of the nozzle. Hydrogen introduced through the hydrogen passage and combustion air introduced through the combustion air passage are mixed in the mixer and combusted in the combustion chamber to form flue gas. Cold air introduced through the cooling air passage is used to lower the temperature of the flue gas in the combustion chamber. The hydrogen passage, combustion air passage, cooling air passage, mixer, and nozzle constitute a single arrangement unit. The hydrogen-infused burner is cylindrical; the plurality of the arrangement units are spaced apart along the circumference of the hydrogen-infused burner. The outlet of the main hydrogen pipeline unit is connected to the hydrogen passage to deliver hydrogen into the combustion chamber. Part of the flue gas temperature detection unit extends into the combustion chamber to detect the flue gas temperature inside 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 through the cooling air passage according to the flue gas temperature value detected by the flue gas temperature detection unit, so as to maintain the flue gas temperature in the combustion chamber within a preset range.

2. The hydrogen-blended combustion system for coal-fired power units according to claim 1, characterized in that, The main hydrogen pipeline unit includes a hydrogen production and storage device, an air compressor, a check valve and a flow regulating valve, a flow meter and connecting pipelines; one end of the connecting pipeline is connected to the hydrogen storage device and the other end is connected to the hydrogen-blending burner. An air compressor, a check valve, and a flow regulating valve are sequentially arranged along the connecting pipeline from near the hydrogen production and storage device to away from the hydrogen production and storage device; a flow meter is installed in the connecting pipeline and is located between the flow regulating valve and the hydrogen-blended burner; The air compressor, check valve, flow regulating valve, and flow meter are all connected to the PLC control unit.

3. The hydrogen-blended combustion system for coal-fired power units according to claim 2, characterized in that, The hydrogen production and storage device uses photovoltaic power generation or wind power generation in the plant area to produce and store hydrogen.

4. The hydrogen-blended combustion system for coal-fired power units according to claim 3, characterized in that, It also includes solenoid valves; The solenoid valve is installed in the connecting pipeline and is located between the hydrogen production and storage device and the air compressor; The solenoid valve is connected to the PLC control unit.

5. The hydrogen-blended combustion system for coal-fired power units according to claim 4, characterized in that, It also includes a first pressure gauge and a second pressure gauge; Both the first pressure gauge and the second pressure gauge are installed in the connecting pipeline, with the first pressure gauge located between the solenoid valve and the air compressor, and the second pressure gauge located between the air compressor and the check valve. The first pressure gauge and the second pressure gauge are respectively connected to the PLC control unit.

6. The hydrogen-blended combustion system for coal-fired power units according to claim 5, characterized in that, It also includes a third pressure gauge; The third pressure gauge is installed in the connecting pipeline, and the third pressure gauge is located between the flow regulating valve and the flow meter; The third pressure gauge is connected to the PLC control unit.

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

8. The hydrogen-blended combustion system for coal-fired power units according to claim 1, characterized in that, The preset range is 1000℃-1500℃.

9. A method for hydrogen-blended combustion in a coal-fired power unit, characterized in that, The application to the hydrogen-blended combustion system of a coal-fired unit as described in any one of claims 1-8 includes the following steps: Hydrogen is sequentially transported to the combustion chamber via the main hydrogen pipeline unit and the hydrogen passage; simultaneously, combustion air is sequentially transported to the combustion chamber via the branch pipes led out from the secondary air duct of the coal-fired boiler and the combustion air passage, and cooling air is sequentially transported to the combustion chamber via the branch pipes led out from the primary air duct of the coal-fired boiler and the cooling air passage. The opening of the flow regulating valve of the hydrogen main pipeline unit is controlled by the PLC control unit, so that hydrogen and combustion air enter the hydrogen-blended burner for mixing and combustion in a preset ratio; The temperature of the flue gas generated in the combustion chamber is detected using a flue gas temperature detection unit. If the flue gas temperature exceeds the preset range, the cooling air flow rate in the cooling air passage is adjusted by the PLC control unit, and the flue gas temperature in the combustion chamber is adjusted by the cooling air to maintain the flue gas temperature in the combustion chamber within the preset range.

Images