Flue gas circulation hydrogen-doped combustion peak shaving and flame stabilization system and method

Abstract

The embodiment of the present disclosure provides a flue gas circulation hydrogen-doped combustion peak shaving and combustion stabilizing system, comprising a boiler, an electrolytic water device, a flue gas-hydrogen gas mixer and a flue gas-hydrogen gas burner; the boiler is provided with the burner, the flue gas-hydrogen gas burner is arranged at the lowermost layer of the boiler; the electrolytic water device is powered by a power supply device, the anode outlet of the electrolytic water device is communicated with the combustion-supporting agent inlet of the burner, and the cathode outlet of the electrolytic water device is communicated with the hydrogen gas inlet of the flue gas-hydrogen gas mixer; the flue gas outlet of the boiler is communicated with the chimney inlet and the flue gas inlet of the flue gas-hydrogen gas mixer; and the mixing outlet of the flue gas-hydrogen gas mixer is communicated with the inlet of the flue gas-hydrogen gas burner. Through hydrogen-doped combustion and oxygen-enriched combustion, the system can make the boiler combustion stable, safe, reduce coal consumption and save cost when the unit deeply adjusts the peak.

Description

TECHNICAL FIELD

[0001] The embodiment of the present disclosure belongs to the technical field of coal power units, and particularly relates to a flue gas circulation hydrogen-doped combustion peak shaving and combustion stabilizing system and method. BACKGROUND

[0002] With the accelerated construction of the global energy internet proposed by the State Grid, new energy power generation such as wind power and solar power is connected to the grid on a large scale, but the unstable characteristics of the output make the peak-valley difference of the power load increase, and the grid peak shaving pressure increases. The current energy situation and power installation structure in China determine that coal power units will bear the main peak shaving task.

[0003] Generally speaking, the main way of coal power unit peak shaving operation is: low load operation, two-shift operation, less steam reactive operation and round stop peak shaving. Among them, the low load operation mode is to change the unit load to meet the system peak shaving needs. Most of the grid-connected coal power units in China are scheduled by the power grid. Generally, the unit peak shaving variable load range is 50% to 100% of the rated output of the unit. Most of the coal power units of 300 MW and above capacity level in service adopt low load operation mode to participate in peak shaving. Coal machine deep regulation has become the norm, but for supercritical and above parameter units, frequent deep regulation to 25% below load operation has a greater impact on unit safety, and long-term low load operation reduces the economy and even sacrifices the safety of the equipment.

[0004] Hydrogen energy is a secondary energy source that is abundant in resources, green and low-carbon, and widely used. As a green and clean energy carrier, hydrogen can be produced and used on a large scale, sustainably and at a reasonable price, which is an important development direction and has important significance for carbon emission reduction.

[0005] Hydrogen can be produced by reforming fossil energy, purifying industrial by-product gas, etc., or by electrolysis of water. The combination of hydrogen production by electrolysis of water and renewable energy generation technology can optimize China's energy structure and improve the safety of the entire energy system.

[0006] In view of the above problems, it is necessary to provide a flue gas circulation hydrogen-doped combustion peak shaving and combustion stabilizing system and method which is reasonable in design and effective in solving the above problems. SUMMARY

[0007] The embodiment of the present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a flue gas circulation hydrogen-doped combustion peak shaving and combustion stabilizing system and method.

[0008] An aspect of the embodiment of the present disclosure provides a flue gas circulation hydrogen-doped combustion peak shaving and combustion stabilizing system, comprising a boiler, an electrolytic water device, a flue gas-hydrogen gas mixer and a flue gas-hydrogen gas burner.

[0009] The boiler is provided with a burner, and the flue gas-hydrogen burner is arranged at the lowermost layer of the boiler.

[0010] The electrolytic water device is powered by a power supply device, the anode outlet of the electrolytic water device is connected to the combustion-supporting agent inlet of the burner, and the cathode outlet of the electrolytic water device is connected to the hydrogen inlet of the flue gas-hydrogen mixer.

[0011] The flue gas outlet of the boiler is connected to the chimney inlet and the flue gas inlet of the flue gas-hydrogen mixer.

[0012] The mixing outlet of the flue gas-hydrogen mixer is connected to the inlet of the flue gas-hydrogen burner.

[0013] Optionally, the system further comprises a generator and a steam turbine.

[0014] The inlet of the steam turbine is connected to the steam outlet of the boiler, and the outlet of the steam turbine is connected to the generator to drive the generator to generate electricity.

[0015] The power supply device comprises a plant power device, and when the electricity demand of the power grid is low or the boiler is at the lowest stable combustion load, the plant power device supplies part of the electricity generated by the generator to the electrolytic water device.

[0016] Optionally, the system further comprises an electricity peak shaving distribution switch connected to the generator.

[0017] Optionally, the power supply device further comprises a renewable energy power generation device.

[0018] In a normal load range, the renewable energy power generation device supplies power to the electrolytic water device.

[0019] Optionally, an oxygen delivery pipeline is connected between the anode outlet of the electrolytic water device and the inlet of the burner.

[0020] The oxygen delivery pipeline is sequentially provided with an oxygen storage device, an oxygen shut-off door, an oxygen compressor, an oxygen check valve, and an oxygen regulating valve; wherein

[0021] The inlet of the oxygen storage device is connected to the anode outlet of the electrolytic water device.

[0022] Optionally, a hydrogen delivery pipeline is connected between the cathode outlet of the electrolytic water device and the flue gas-hydrogen mixer.

[0023] The hydrogen delivery pipeline is sequentially provided with a hydrogen storage device, a hydrogen shut-off door, a hydrogen compressor, a hydrogen check valve, and a hydrogen regulating valve; wherein

[0024] The inlet of the hydrogen storage device is connected with the cathode outlet of the water electrolysis device.

[0025] Optionally, the system further comprises a flue gas main pipeline, a flue gas circulation pipeline and a flue gas exhaust pipeline;

[0026] The inlet of the flue gas main pipeline is connected with the flue gas outlet of the boiler, and an induced draft fan is arranged in the flue gas main pipeline;

[0027] The outlet of the flue gas main pipeline is connected with the inlet of the flue gas circulation pipeline and the inlet of the flue gas exhaust pipeline respectively;

[0028] The outlet of the flue gas exhaust pipeline is connected with the chimney, and a desulfurization tower is arranged in the flue gas exhaust pipeline;

[0029] The outlet of the flue gas circulation pipeline is connected with the flue gas inlet of the flue gas-hydrogen mixer.

[0030] Optionally, the flue gas circulation pipeline is sequentially arranged with a flue gas shutoff door, a flue gas regulating door and a flue gas check valve;

[0031] The outlet of the flue gas check valve is connected with the flue gas-hydrogen mixer.

[0032] Optionally, the lowermost layer of the boiler is provided with a plurality of flue gas-hydrogen burners.

[0033] Another aspect of the embodiment of the present disclosure provides a flue gas circulation hydrogen-doped combustion peak regulation and stable combustion method, which adopts the flue gas circulation hydrogen-doped combustion peak regulation and stable combustion system described above.

[0034] The flue gas circulation hydrogen-doped combustion peak regulation and stable combustion system and method of the embodiment of the present disclosure can reduce the carbon emission of the unit, stabilize the combustion condition of the coal-fired or gas-fired unit at low load, and increase the flexibility of the boiler by arranging the flue gas-hydrogen burner in the lowermost layer of the boiler, mixing the hydrogen prepared by the water electrolysis device with the flue gas in the flue gas-hydrogen mixer, and then delivering the hydrogen to the flue gas-hydrogen burner. In addition, the hydrogen can effectively reduce the risk of deflagration in an inert environment, and improve the safety of the system. The oxygen prepared by the water electrolysis device can be used as a combustion-supporting agent for the boiler burner to perform oxygen-enriched combustion. The oxygen and the powder feeding primary air are mixed and then delivered to the furnace for combustion, which can make the unit burn the coal with poor combustion quality, save costs, and further stabilize the combustion condition of the unit at low load. The flue gas circulation hydrogen-doped combustion peak regulation and stable combustion system can make the boiler combustion stable, safe, reduce coal consumption and save costs when the unit deeply regulates the peak load through hydrogen-doped combustion and oxygen-enriched combustion. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1This is a schematic diagram of the structure of a flue gas recirculation hydrogen-infused combustion peak-shaving and stable combustion system according to one embodiment of the present disclosure. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of the embodiments of this disclosure, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0037] like Figure 1 As shown, one aspect of this disclosure provides a flue gas recirculation hydrogen-blended combustion peak-shaving and stable combustion system, including a boiler 1, an electrolysis water device 2, a flue gas-hydrogen mixer 3, and a flue gas-hydrogen burner 4.

[0038] Boiler 1 is equipped with burner 5. Boiler 1 can be a coal-fired (gas-fired) boiler, and correspondingly, burner 5 can be a coal-fired (gas-fired) burner.

[0039] The flue gas-hydrogen burner 4 is located at the bottom of the boiler 1.

[0040] The water electrolysis device 2 is powered by a power supply device. The anode outlet of the water electrolysis device 2 is connected to the combustion aid inlet of the burner 5, and the cathode outlet of the water electrolysis device 2 is connected to the hydrogen inlet of the flue gas-hydrogen mixer 3.

[0041] The flue gas outlet of boiler 1 is connected to the inlet of chimney 6 and the flue gas inlet of flue gas-hydrogen mixer 3, respectively.

[0042] The mixing outlet of the flue gas-hydrogen mixer 3 is connected to the inlet of the flue gas-hydrogen burner 4.

[0043] Specifically, the hydrogen produced by the water electrolysis unit 2 is mixed with a portion of the flue gas generated by the boiler 1 in the flue gas-hydrogen mixer 3 according to a preset ratio to form hydrogen-blended flue gas. This hydrogen-blended flue gas then enters the flue gas-hydrogen burner 4, which is located at the bottom of a conventional coal or gas burner. The combustion chamber is entirely lined with refractory material. Because the combustion temperature of hydrogen is very high, reaching 2000℃~3000℃, the temperature of the flue gas after combustion can be controlled at around 1500℃ by adjusting the mixing ratio of hydrogen and flue gas before being injected into the furnace. By using hydrogen-blended flue gas for combustion, the unit's carbon emissions can be reduced, the combustion status of coal or gas-fired units can be stabilized at low loads, and the boiler's flexibility can be increased. The oxygen produced by the water electrolysis unit 2 is mixed with the pulverized primary air and then enters the burner 5 through the combustion aid inlet. This allows the unit to burn coal with lower quality, saving costs and further stabilizing the combustion status at low loads. The remaining flue gas generated by the boiler 1 is discharged through the chimney 6.

[0044] The flue gas circulation hydrogen-doped combustion peak shaving and combustion stabilizing system of the embodiment of the present disclosure is provided with a flue gas-hydrogen gas burner at the lowermost layer of the boiler, hydrogen gas prepared by the water electrolysis device is mixed with flue gas in a flue gas-hydrogen gas mixer and then delivered to the flue gas-hydrogen gas burner, and the flue gas-doped hydrogen combustion can reduce the carbon emission of the unit, stabilize the combustion condition of the coal-fired or gas-fired unit at low load, and increase the flexibility of the boiler. In addition, hydrogen gas can effectively reduce the risk of deflagration in an inert environment and improve the safety of the system. Oxygen gas prepared by the water electrolysis device can be used as a combustion-supporting agent of the boiler burner for oxygen-enriched combustion, the prepared oxygen gas is mixed with the powder feeding primary air and then delivered to the furnace for combustion, which can make the unit burn low-quality coal and save costs, and can further stabilize the combustion condition of the unit at low load. The flue gas circulation hydrogen-doped combustion peak shaving and combustion stabilizing system can make the boiler combustion stable, safe, reduce coal consumption and save costs when the unit is deeply peaking through hydrogen-doped combustion and oxygen-enriched combustion.

[0045] As shown in the example of FIG. 1, the system further comprises a steam turbine 7 and a generator 8, an inlet of the steam turbine 7 is connected with a steam outlet of the boiler 1, and an outlet of the steam turbine 7 is connected with the generator 8 to drive the generator 8 to generate electricity. Figure 1

[0046] The power supply device comprises a station service power supply device, and the station service power supply device supplies part of the electricity output by the generator 8 to the water electrolysis device 2 when the electricity consumption of the power grid is low or the dispatching load is lower than the minimum stable combustion load of the boiler.

[0047] As shown in the example of FIG. 1, the system further comprises a steam turbine 7 and a generator 8, an inlet of the steam turbine 7 is connected with a steam outlet of the boiler 1, and an outlet of the steam turbine 7 is connected with the generator 8 to drive the generator 8 to generate electricity. Figure 1

[0048] Specifically, when the electricity consumption of the power grid is low or the dispatching load is lower than the minimum stable combustion load of the boiler, the water electrolysis device is started, the electricity peak shaving and distribution switch 9 is turned on, and the station service power supply device supplies part of the electricity output by the generator 8 to the water electrolysis device 2 to start the water electrolysis device 2 to prepare hydrogen and oxygen, hydrogen mixed with flue gas is combusted, and oxygen assists the boiler to stabilize combustion. The electricity output by the generator 8 is used to prepare hydrogen by the water electrolysis device 2, thereby realizing the function of the thermal power unit to reduce the on-grid electricity and to peak at a larger power.

[0049] In the embodiment of the present disclosure, the electricity peak shaving and distribution switch and the station service power supply device can improve the peaking capacity of the unit. When the unit is deeply peaking, a certain proportion of electricity can be used to prepare hydrogen and oxygen by the water electrolysis device through the station service power supply device under the condition that the required load of the power grid is met, which can make the unit reduce the on-grid electricity at a larger power. Under this operating condition, the boiler does not need to convert between dry and wet states when deeply peaking, thereby increasing the flexibility and safety of the boiler. Meanwhile, the unit still operates at a larger power when deeply peaking, and the boiler operates relatively efficiently, which can effectively reduce the coal consumption.​​

[0050] As shown in Figure 1 The power supply device also includes a renewable energy power generation device, which supplies power to the water electrolysis device 2 within a normal load range. The renewable energy power generation device can be a power plant photovoltaic power generation device, a wind power generation device, or a valley-peak power generation device. The type of renewable energy power generation device is not limited in the embodiment and can be selected according to actual needs.

[0051] In the embodiment, the renewable energy power generation device is used to supply power to the water electrolysis device, which can further save coal and reduce costs.

[0052] As shown in Figure 1 The anode outlet of the water electrolysis device 2 is connected to the inlet of the combustor 5 of the boiler 10 via an oxygen delivery pipeline 10. The oxygen prepared by the water electrolysis device 2 can enter the combustor 5 of the boiler 1 via the oxygen delivery pipeline 10.

[0053] Further, the oxygen delivery pipeline 10 is sequentially connected with an oxygen storage device 11, an oxygen shut-off door 11a, an oxygen compressor 12, an oxygen check valve 13, and an oxygen regulating valve 14. The inlet of the oxygen storage device 11 is connected to the anode outlet of the water electrolysis device 2. In the system, the oxygen shut-off door 11a, the oxygen compressor 12, the oxygen check valve 13, and the oxygen regulating valve 14 are connected to the PLC control system or the power plant DCS.

[0054] Specifically, the oxygen prepared by the water electrolysis device 1 can be stored in the oxygen storage device 11. When oxygen needs to be supplied to the combustor 5 of the boiler 1, the oxygen compressor 12, the oxygen check valve 13, and the oxygen regulating valve 14 can be opened to deliver and regulate the flow of oxygen.

[0055] As shown in Figure 1 The cathode outlet of the water electrolysis device 2 is connected to the flue gas-hydrogen mixer 3 via a hydrogen delivery pipeline 15. The hydrogen prepared by the water electrolysis device 2 can be delivered to the flue gas-hydrogen mixer 3 via the hydrogen delivery pipeline 15.

[0056] Further, the hydrogen delivery pipeline 15 is sequentially connected with a hydrogen storage device 16, a hydrogen shut-off door 16a, a hydrogen compressor 17, a hydrogen check valve 18, and a hydrogen regulating valve 19. The inlet of the hydrogen storage device 16 is connected to the cathode outlet of the water electrolysis device 2. In the system, the hydrogen shut-off door 16a, the hydrogen compressor 17, the hydrogen check valve 18, and the hydrogen regulating valve 19 are connected to the PLC control system or the power plant DCS.

[0057] Specifically, the hydrogen gas prepared by the water electrolysis device 1 can be stored by the hydrogen gas storage device 16, and when it is needed to introduce hydrogen gas into the flue gas-hydrogen gas mixer 3, the hydrogen gas compressor 17, the hydrogen gas check valve 18 and the hydrogen gas regulating valve 19 can be opened to transport and regulate the flow of hydrogen gas.

[0058] As shown in the example, Figure 1 The system further includes a flue gas main pipeline 20, a flue gas circulation pipeline 21 and a flue gas discharge pipeline 22.

[0059] The inlet of the flue gas main pipeline 20 is connected with the flue gas outlet of the boiler 1, and an induced draft fan 23 is arranged in the flue gas main pipeline 20. The outlet of the flue gas main pipeline 20 is connected with the inlet of the flue gas circulation pipeline 21 and the inlet of the flue gas discharge pipeline 22 respectively. The outlet of the flue gas discharge pipeline 22 is connected with the chimney 6, and a desulfurization tower 24 is arranged in the flue gas discharge pipeline 22. The outlet of the flue gas circulation pipeline 21 is connected with the flue gas inlet of the flue gas-hydrogen gas mixer 3.

[0060] Specifically, the flue gas generated by the boiler 1 enters the flue gas main pipeline 20, and part of the flue gas is discharged into the flue gas discharge pipeline 22 by the output of the induced draft fan 23, and then discharged through the chimney 6 after being treated by the desulfurization tower 24 in the flue gas discharge pipeline 22. Part of the flue gas is discharged into the flue gas circulation pipeline 21 by the output of the induced draft fan 23, and then enters the flue gas-hydrogen gas mixer 3 through the flue gas circulation pipeline 21 for mixing with the hydrogen gas entering the flue gas-hydrogen gas mixer 3. That is, another part of the flue gas is transported through the flue gas circulation pipeline 21 to participate in the flue gas circulation of the system.

[0061] As an example, the flue gas circulation pipeline 21 is sequentially arranged with a flue gas shut-off door 25, a flue gas regulating door 26 and a flue gas check valve 27, and the outlet of the flue gas check valve 27 is connected with the flue gas-hydrogen gas mixer 3. The flue gas shut-off door 25, the flue gas regulating door 26 and the flue gas check valve 27 are used to control the transportation of the flue gas and the regulation of the flue gas flow.

[0062] It should be noted that in this embodiment, the flue gas-hydrogen gas mixer 3 can use compressed hydrogen gas to induce flue gas for mixing, which can effectively reduce the influence of the system on the output of the induced draft fan 23.

[0063] It should be noted that the lowermost layer of the boiler 1 is provided with multiple layers of flue gas-hydrogen gas burners 4. The number of flue gas-hydrogen gas burners 4 is not specifically limited in this embodiment, and can be selected according to the unit capacity.

[0064] Another aspect of the embodiment of the present disclosure provides a flue gas circulation hydrogen-doped combustion peak shaving and stable combustion method, which adopts the flue gas circulation hydrogen-doped combustion peak shaving and stable combustion system described above. The specific structural features of the flue gas circulation hydrogen-doped combustion peak shaving and stable combustion system have been described in detail above, and will not be repeated here.

[0065] In the method, the specific process of the smoke circulation hydrogen-doped combustion peak regulation and combustion stabilization method can be as follows.

[0066] In the normal load range, the renewable energy power generation device can be used to supply power to the water electrolysis device 2, and the hydrogen and oxygen produced by the water electrolysis device 2 can be respectively stored in the hydrogen storage device 16 and the oxygen storage device 11 for standby, or the oxygen can be used to assist the boiler in stable combustion, reduce the coal powder ignition point temperature, and improve the coal powder combustion rate and combustion scale, the hydrogen can be used to mix with the smoke circulation combustion, stabilize the combustion, and save the coal.

[0067] When the power grid electricity consumption is low or the dispatching load is lower than the minimum stable combustion load of the boiler, the water electrolysis device is started, the power peak regulation distribution switch 9 is opened, and part of the power output by the generator 8 is used to supply power to the water electrolysis device 2 by using the plant power device, the water electrolysis device 2 starts to electrolyze water to produce hydrogen and oxygen, the hydrogen mixes with the smoke for combustion, and the oxygen assists the boiler in stable combustion.

[0068] The smoke circulation hydrogen-doped combustion peak regulation and combustion stabilization method of the embodiment of the present disclosure can reduce the carbon emission of the unit, stabilize the combustion of the coal-fired or gas-fired unit at low load, and increase the flexibility of the boiler by using the smoke circulation hydrogen-doped combustion peak regulation and combustion stabilization system and the smoke hydrogen-doped combustion. In addition, the hydrogen can effectively reduce the risk of deflagration in an inert environment, and improve the safety of the system. By using the oxygen-enriched combustion, the coal with poor combustion quality can be burned, the cost can be saved, the combustion at low load of the unit can be further stabilized, the boiler can be stably and safely burned, the coal consumption can be reduced, and the cost can be saved when the unit is deeply regulated.

[0069] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the embodiments of the present disclosure, and the embodiments of the present disclosure are not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered as the protection scope of the embodiments of the present disclosure.

Claims

1. A flue gas circulation hydrogen-doped combustion peak shaving and flame stabilization system, characterized in that, The system comprises a boiler, an electrolytic water device, a flue gas-hydrogen mixer, and a flue gas-hydrogen burner. The boiler is provided with a burner, and the flue gas-hydrogen burner is arranged at the lowermost layer of the boiler. The electrolytic water device is powered by a power supply device, the anode outlet of the electrolytic water device is connected to the combustion-supporting agent inlet of the burner, and the cathode outlet of the electrolytic water device is connected to the hydrogen inlet of the flue gas-hydrogen mixer. The flue gas outlet of the boiler is connected to the chimney inlet and the flue gas inlet of the flue gas-hydrogen mixer. The mixing outlet of the flue gas-hydrogen mixer is connected to the inlet of the flue gas-hydrogen burner.

2. The system of claim 1, wherein, The system further comprises a generator and a steam turbine. The inlet of the steam turbine is connected to the steam outlet of the boiler, and the outlet of the steam turbine is connected to the generator to drive the generator to generate electricity. The power supply device comprises a station service device, which supplies part of the electricity generated by the generator to the electrolytic water device when the electricity demand of the power grid is low or the boiler is at the minimum stable combustion load.

3. The system of claim 2, wherein, The system further comprises an electricity peak shaving distribution switch connected to the generator.

4. The system according to any one of claims 1 to 3, characterized in that, The power supply device further comprises a renewable energy power generation device. Within the normal load range, the renewable energy power generation device supplies electricity to the electrolytic water device.

5. The system according to any one of claims 1 to 3, characterized in that, An oxygen delivery pipeline is connected between the anode outlet of the electrolytic water device and the inlet of the burner. An oxygen storage device, an oxygen shut-off door, an oxygen compressor, an oxygen check valve, and an oxygen regulating valve are sequentially arranged on the oxygen delivery pipeline. The inlet of the oxygen storage device is connected to the anode outlet of the electrolytic water device.

6. The system of any one of claims 1 to 3, wherein, A hydrogen delivery pipeline is connected between the cathode outlet of the electrolytic water device and the flue gas-hydrogen mixer. A hydrogen storage device, a hydrogen shut-off door, a hydrogen compressor, a hydrogen check valve, and a hydrogen regulating valve are sequentially arranged on the hydrogen delivery pipeline. The inlet of the hydrogen storage device is connected to the cathode outlet of the electrolytic water device.

7. The system of any one of claims 1 to 3, wherein, The system further comprises a flue gas main pipeline, a flue gas circulation pipeline, and a flue gas discharge pipeline. The inlet of the flue gas main pipeline is connected to the flue gas outlet of the boiler, and an induced draft fan is arranged on the flue gas main pipeline. The outlet of the flue gas main pipeline is connected to the inlet of the flue gas circulation pipeline and the inlet of the flue gas discharge pipeline. The outlet of the flue gas discharge pipeline is connected to the chimney, and a desulfurization tower is arranged on the flue gas discharge pipeline. The outlet of the flue gas circulation pipeline is connected to the flue gas inlet of the flue gas-hydrogen mixer.

8. The system of claim 7, wherein, A flue gas shut-off door, a flue gas regulating door, and a flue gas check valve are sequentially arranged on the flue gas circulation pipeline. The outlet of the flue gas check valve is connected to the flue gas-hydrogen mixer.

9. The system of any one of claims 1 to 3, wherein, The lowermost layer of the boiler is provided with multiple flue gas-hydrogen burners.

10. A method for flue gas recirculation hydrogen-doped combustion peak shaving and flame stabilization, characterized in that, The flue gas circulation hydrogen-doped combustion peak shaving and stable combustion system of any one of claims 1 to 9 is adopted.

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