Coal-fired boiler hydrogen-oxygen synergistic reinforcement stable combustion system and stable combustion method

Abstract

The system comprises a coal-fired boiler power generation device, a new energy power generation device, a water electrolysis device and a storage device. The coal-fired boiler power generation device comprises a boiler, an oxygen-enriched burner and a hydrogen burner, wherein the oxygen-enriched burner and the hydrogen burner are arranged in a hearth of the boiler. The water electrolysis device is electrically connected with the coal-fired boiler power generation device and the new energy power generation device; the storage device comprises an oxygen storage tank and a hydrogen storage tank, the input end of the oxygen storage tank is connected with the oxygen output end of the water electrolysis device, and the output end of the oxygen storage tank is connected with the oxygen-enriched combustor; the input end of the hydrogen storage tank is connected with the hydrogen output end of the water electrolysis device, and the output end of the hydrogen storage tank is connected with the hydrogen combustor. The energy storage and peak regulation device has the advantages that the stable combustion capacity of a coal-fired boiler power generation device (particularly a boiler) is improved, and the energy storage and peak regulation capacity of a power plant is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and particularly to a hydrogen-oxygen collaborative enhanced stable combustion system and method for a coal-fired boiler. Background Art

[0002] Since China's energy structure is mainly based on fossil energy and due to the intermittency and instability of renewable energy, deep peak shaving of coal-fired units has become an important means to increase the absorption of renewable energy. To absorb more renewable energy, it will also become normal for large-capacity and high-parameter coal-fired power generation units to participate in deep peak shaving.

[0003] The existing coal-fired units generally have a minimum technical output of about 45%. For units burning lean coal, it will be even higher. To meet the requirement of 30%, the units must be flexibly retrofitted to improve the stable combustion ability of the units. In the existing solutions, the flexible retrofit generally starts from the transformation of the boiler burners, upgrading and replacing the pulverized coal burners with burners having stronger stable combustion ability, so as to improve the stable combustion ability of the boiler. However, the budget cost for upgrading and replacing the burners is relatively high and the construction period is relatively long, and it can generally only be completed during the major overhaul period.

[0004] Therefore, it is urgent for those skilled in the art to provide a hydrogen-oxygen collaborative enhanced stable combustion system and method for a coal-fired boiler to improve the stable combustion energy of the boiler and improve the peak shaving ability of the power plant units. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art, so as to provide a hydrogen-oxygen collaborative enhanced stable combustion system and method for a coal-fired boiler.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A hydrogen-oxygen collaborative enhanced stable combustion system for a coal-fired boiler includes a coal-fired boiler power generation device, a new energy power generation device, a water electrolysis device, and a storage device;

[0008] The coal-fired boiler power generation device includes a boiler, and an oxygen-enriched burner and a hydrogen burner disposed in the furnace of the boiler;

[0009] The water electrolysis device is electrically connected to both the coal-fired boiler power generation device and the new energy power generation device to electrolyze water to prepare oxygen and hydrogen by using the electric energy provided by the coal-fired boiler power generation device and / or the new energy power generation device;

[0010] The storage device includes an oxygen storage tank and a hydrogen storage tank,

[0011] The input end of the oxygen storage tank is connected to the oxygen output end of the water electrolysis device, and the output end is connected to the oxygen-enriched burner;

[0012] The input end of the hydrogen storage tank is connected to the hydrogen output end of the water electrolysis device, and the output end is connected to the hydrogen burner.

[0013] Preferably, the output end of the oxygen storage tank is connected to the oxy-fuel burner through an oxygen supply pipeline;

[0014] Along the direction from the oxygen storage tank to the oxy-fuel burner, an oxygen purification device, an oxygen concentration detector and an oxygen regulating valve are sequentially arranged on the oxygen supply pipeline.

[0015] Preferably, the oxy-fuel burner includes an upper-layer oxy-fuel burner and a lower-layer oxy-fuel burner;

[0016] The oxygen supply pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline;

[0017] The oxygen purification device and the oxygen concentration detector are both arranged on the main pipeline;

[0018] The oxygen regulating valve includes a first oxygen regulating valve and a second oxygen regulating valve. The first oxygen regulating valve is located on the first branch pipeline, and the second oxygen regulating valve is located on the second branch pipeline;

[0019] The upper-layer oxy-fuel burner and the lower-layer oxy-fuel burner are respectively connected to the output end of the main pipeline through the first branch pipeline and the second branch pipeline.

[0020] Preferably, the output end of the hydrogen storage tank is connected to the hydrogen burner through a hydrogen supply pipeline;

[0021] Along the direction from the hydrogen storage tank to the hydrogen burner, a hydrogen purification device, a hydrogen concentration detector and a hydrogen regulating valve are sequentially arranged on the hydrogen supply pipeline.

[0022] Preferably, the oxy-fuel burner includes an upper-layer oxy-fuel burner and a lower-layer oxy-fuel burner;

[0023] The coal-fired boiler power generation device further includes a hot secondary air box and a plurality of hot secondary air nozzle burners, and the hot secondary air nozzle burners are connected to the hot secondary air box;

[0024] Along the direction from the bottom to the top of the boiler, the hydrogen burner, one of the hot secondary air nozzle burners, the lower-layer oxy-fuel burner, one of the hot secondary air nozzle burners, the upper-layer oxy-fuel burner, and one of the hot secondary air nozzle burners are sequentially distributed.

[0025] Preferably, an electrode boiler and a heat supply first station are further included;

[0026] The coal-fired boiler power generation device further includes a steam turbine and a generator set. The steam output end of the generator set is connected to the input end of the electrode boiler, and the output end of the electrode boiler is connected to the heat supply primary station.

[0027] Preferably, the heat supply primary station is further connected to the steam output end of the boiler through a steam pipeline.

[0028] A stable combustion method based on the above coal-fired boiler hydrogen-oxygen synergistic enhanced stable combustion system includes the following steps:

[0029] Supply at least the excess power of the coal-fired boiler power generation device and / or the new energy power generation device to the water electrolysis device to prepare oxygen and hydrogen;

[0030] Store the hydrogen and the oxygen;

[0031] Supply the hydrogen and / or the oxygen to the oxygen-enriched burner and the hydrogen burner located in the furnace of the boiler.

[0032] Preferably, it further includes the following steps:

[0033] Before supplying oxygen to the oxygen-enriched burner, purify the oxygen and monitor its concentration;

[0034] Before supplying hydrogen to the hydrogen burner, purify the hydrogen and monitor its concentration.

[0035] Preferably, it further includes the following steps:

[0036] When the output of the coal-fired boiler power generation device is higher than the first preset load, turn on the hot secondary air nozzle burner;

[0037] When the output of the coal-fired boiler power generation device is lower than the second preset load, turn on the hydrogen burner and the lower-layer oxygen-enriched burner;

[0038] When the output of the coal-fired boiler power generation device is between the first preset load and the second preset load, turn on the upper-layer oxygen-enriched burner, the lower-layer oxygen-enriched burner and the hydrogen burner;

[0039] The first preset load is greater than the second preset load.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] A hydrogen-oxygen synergistic enhanced stable combustion system for a coal-fired boiler provided by the present invention, through the mutual cooperation of a coal-fired boiler power generation device, a new energy power generation device, and a water electrolysis device. On the one hand, it can make full use of the electric energy output by the new energy power generation device and avoid waste of energy. On the other hand, the hydrogen and oxygen generated by water electrolysis are respectively transported to the oxygen-enriched burner and hydrogen burner of the coal-fired boiler power generation device to assist combustion, which can improve the stable combustion ability of the coal-fired boiler power generation device (specifically its boiler) and reduce the minimum output of the unit. In addition, the coal-fired boiler power generation device and the storage device cooperate with each other, and the excess power output by the coal-fired boiler power generation device can be used for electrolyzing water to prepare hydrogen and oxygen, and realize the storage of hydrogen and oxygen, forming in-plant energy storage, which greatly improves the energy storage peak regulation ability of the power plant. Correspondingly, the stable combustion method based on the above hydrogen-oxygen synergistic enhanced stable combustion system of the present invention can reuse the electric energy output by the unit, ensure the stable combustion ability of the coal-fired boiler power generation device (specifically its boiler), and improve the energy storage peak regulation ability of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0043] Figure 1 It is a schematic structural diagram of one example of the present invention.

[0044] Figure 2 It is a flow block diagram of the system of the present invention.

[0045] Figure 3 For Figure 1 a connection schematic diagram of one example of the oxygen-enriched burner and the coal-fired boiler power generation device in

[0046] Description of the reference numerals:

[0047] 1. Coal-fired boiler power generation device; 10. Boiler; 11. Oxygen-enriched burner; 111. Upper oxygen-enriched burner; 112. Lower oxygen-enriched burner; 12. Hydrogen burner; 13. Hot secondary air box; 14. Hot secondary air nozzle burner; 141. First hot secondary air nozzle burner; 142. Second hot secondary air nozzle burner; 143. Third hot secondary air nozzle burner; 15. Steam turbine; 16. Generator set; 2. New energy power generation device; 21. Transformer; 22. Fan; 23. Photovoltaic; 3. Water electrolysis device; 4. Storage device; 41. Oxygen storage tank; 42. Hydrogen storage tank; 5. Oxygen supply pipeline; 500. Main pipeline; 501. First branch pipe; 502. Second branch pipe; 51. Oxygen purification equipment; 52. Oxygen concentration detection meter; 53. Oxygen regulating valve; 531. First oxygen regulating valve; 532. Second oxygen regulating valve; 6. Hydrogen supply pipeline; 61. Hydrogen purification equipment; 62. Hydrogen concentration detection meter; 63. Hydrogen regulating valve; 7. Electrode boiler; 8. Heat supply first station; 9. Steam pipeline. Detailed implementation manners

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0050] In the description of the present invention, 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] See Figures 1 to 3, an embodiment of the present invention provides a hydrogen-oxygen collaborative enhanced stable combustion system for a coal-fired boiler, including a coal-fired boiler power generation device 1, a new energy power generation device 2, a water electrolysis device 3, and a storage device 4; wherein, the coal-fired boiler power generation device 1 includes a boiler 10, an oxygen-enriched burner 11 and a hydrogen burner 12 arranged in the furnace of the boiler 10; the water electrolysis device 3 is electrically connected to both the coal-fired boiler power generation device 1 and the new energy power generation device 2 to electrolyze water using the electric energy provided by the coal-fired boiler power generation device 1 and / or the new energy power generation device 2 to prepare oxygen and hydrogen; the storage device 4 includes an oxygen storage tank 41 and a hydrogen storage tank 42, the input end of the oxygen storage tank 41 is connected to the oxygen output end of the water electrolysis device 3, and the output end is connected to the oxygen-enriched burner 11; the input end of the hydrogen storage tank 42 is connected to the hydrogen output end of the water electrolysis device 3, and the output end is connected to the hydrogen burner 12.

[0052] It is not difficult to understand that in the above solution, through the mutual cooperation of the coal-fired boiler power generation device 1, the new energy power generation device 2 and the water electrolysis device 3, on the one hand, the electric energy output by the new energy power generation device 2 can be fully utilized to avoid waste of energy; on the other hand, the hydrogen and oxygen generated by water electrolysis are respectively transported to the oxygen-enriched burner 11 and the hydrogen burner 12 of the coal-fired boiler power generation device 1 to assist combustion, which can improve the stable combustion ability of the coal-fired boiler power generation device 1 (specifically its boiler 10) and reduce the minimum output of the unit. In addition, the coal-fired boiler power generation device 1 and the storage device 4 cooperate with each other, and the excess electric energy output by the coal-fired boiler power generation device 1 can be used to electrolyze water to prepare hydrogen and oxygen, and realize the storage of hydrogen and oxygen, forming in-plant energy storage, which greatly improves the energy storage peak regulation ability of the power plant.

[0053] See Figure 1 and Figure 2 , in this embodiment, the new energy power generation device 2 includes a transformer 21, a fan 22 and a photovoltaic 23. The fan 22 converts wind energy into electric energy and is used for power grid connection (to the power grid) or for supplying electricity to the plant area. Similarly, the photovoltaic 23 converts light energy into electric energy and is used for power grid connection (to the power grid) or for supplying electricity to the plant area as plant electricity, and the electric energy generated by the new energy power generation device 2 is preferentially used for plant electricity, and the surplus electricity can be directly connected to the power grid through the transformer 21.

[0054] It should be noted that the electricity transmitted by the new energy power generation device 2 to the plant area can be used by the water electrolysis device 3 to electrolyze water, and then prepare hydrogen and oxygen. Of course, a part of the electric energy generated by the coal-fired boiler power generation device 1 can also be used by the water electrolysis device 3 to electrolyze water, and then prepare hydrogen and oxygen to achieve stable combustion of the boiler 10, for example, during the period when the electric energy supplied by the new energy power generation device 2 is insufficient at night. It is not difficult to understand that: the water electrolysis device 3 preferentially uses the electric energy of the new energy power generation device 2 to electrolyze water to produce hydrogen and oxygen, and when necessary, it can also use the electric energy of the coal-fired boiler power generation device 1 to electrolyze water to produce hydrogen and oxygen.

[0055] See Figure 1 and Figure 2 It further includes an electrode boiler 7 and a heat supply primary station 8; the coal-fired boiler power generation device 1 further includes a steam turbine 15 and a generator set 16. The steam output end of the generator set 16 is connected to the input end of the electrode boiler 7, and the output end of the electrode boiler 7 is connected to the heat supply primary station 8.

[0056] Furthermore, the heat supply primary station 8 is also connected to the steam output end of the boiler 10 through a steam pipeline 9.

[0057] It is not difficult to understand that when the grid-connected load is high, the electrode boiler 7 is in a hot standby state, and the steam required by the heat supply primary station 8 is directly supplied by the boiler 10; when the grid-connected load is low, the electrode boiler 7 operates by consuming the plant electricity of the unit (i.e., the electricity generated by the generator set 16) to generate steam, and the steam required by the heat supply primary station 8 is supplied by the electrode boiler 7. Thus, a thermoelectric decoupling mode can be realized to ensure the heat load supply under the condition of a very low grid-connected load of the unit, which can improve the unit output and greatly improve the peak shaving ability of the power plant unit.

[0058] See Figure 1 and Figure 2 The output end of the oxygen storage tank 41 is connected to the oxy-fuel burner 11 through an oxygen supply pipeline 5; along the direction from the oxygen storage tank 41 to the oxy-fuel burner 11, an oxygen purification device 51, an oxygen concentration detection meter 52 and an oxygen regulating valve 53 are sequentially arranged on the oxygen supply pipeline 5. Among them, the oxygen purification device 51 is used to purify the oxygen stored in the oxygen storage tank 41 and then supply it to the oxy-fuel burner 11, the oxygen concentration detection meter 52 is used to monitor the concentration of the supplied oxygen, and the oxygen regulating valve 53 can adopt a flow control valve, and thus can control the flow of the supplied oxygen.

[0059] Similarly, in order to supply hydrogen to the boiler 10 to achieve stable combustion, the output end of the hydrogen storage tank 42 is connected to the hydrogen burner 12 through a hydrogen supply pipeline 6; along the direction from the hydrogen storage tank 42 to the hydrogen burner 12, a hydrogen purification device 61, a hydrogen concentration detection meter 62 and a hydrogen regulating valve 63 are sequentially arranged on the hydrogen supply pipeline 6. Among them, the hydrogen purification device 61 is used to purify the oxygen stored in the hydrogen storage tank 42 and then supply it to the oxy-fuel burner 11, the hydrogen concentration detection meter 62 is used to monitor the concentration of the supplied hydrogen, and the hydrogen regulating valve 63 can also adopt a flow control valve, and thus can control the flow of the supplied hydrogen.

[0060] See Figure 3, in one of the embodiments, the oxy-fuel burner 11 includes an upper-layer oxy-fuel burner 111 and a lower-layer oxy-fuel burner 112; the oxygen supply pipeline 5 includes a main pipeline 500, a first branch pipe 501 and a second branch pipe 502; the oxygen purification equipment 51 and the oxygen concentration detector 52 are both arranged on the main pipeline 500; the oxygen control valves 53 include a first oxygen control valve 531 and a second oxygen control valve 532, the first oxygen control valve 531 is located on the first branch pipe 501, and the second oxygen control valve 532 is located on the second branch pipe 502; the upper-layer oxy-fuel burner 111 and the lower-layer oxy-fuel burner 112 are respectively connected to the output end of the main pipeline 500 through the first branch pipe 501 and the second branch pipe 502.

[0061] Furthermore, the coal-fired boiler power generation device 1 further includes a hot secondary air box 13 and a plurality of hot secondary air nozzle burners 14, and the hot secondary air nozzle burners 14 are connected to the hot secondary air box 13; along the upward direction of the boiler 10 from bottom to top, the hydrogen burner 12, one of the hot secondary air nozzle burners 14 (specifically the first hot secondary air nozzle burner 141), the lower-layer oxy-fuel burner 112, one of the hot secondary air nozzle burners 14 (specifically the second hot secondary air nozzle burner 142), the upper-layer oxy-fuel burner 111, and one of the hot secondary air nozzle burners 14 (specifically the third hot secondary air nozzle burner 143) are arranged in sequence.

[0062] Even further, the two layers of hot secondary air nozzle burners 14 at the lower end (i.e., the second hot secondary air nozzle burner 142 and the third hot secondary air nozzle burner 143) can be set as oxy-fuel type pulverized coal burners.

[0063] The present invention also provides a stable combustion method based on the above-mentioned coal-fired boiler hydrogen-oxygen synergistic enhanced stable combustion system, which specifically includes the following steps:

[0064] Supply at least the excess power of the coal-fired boiler power generation device 1 and / or the new energy power generation device 2 to the water electrolysis device 3 to prepare oxygen and hydrogen;

[0065] Store hydrogen and oxygen;

[0066] Supply hydrogen and / or oxygen to the oxy-fuel burner 11 and the hydrogen burner 12 located in the furnace of the boiler 10.

[0067] Furthermore, the stable combustion method provided in this embodiment further includes the following steps:

[0068] Before supplying oxygen to the oxy-fuel burner 11, purify the oxygen and monitor the concentration;

[0069] Before supplying hydrogen to the hydrogen burner 12, purify the hydrogen and monitor the concentration.

[0070] Furthermore, the stable combustion method provided by this embodiment further includes the following steps:

[0071] When the output of the coal-fired boiler power generation device 1 is higher than the first preset load, the hot secondary air nozzle burner 14 is turned on;

[0072] When the output of the coal-fired boiler power generation device 1 is lower than the second preset load, the hydrogen burner 12 and the lower-layer oxygen-enriched burner 112 are turned on;

[0073] When the output of the coal-fired boiler power generation device 1 is between the first preset load and the second preset load, the upper-layer oxygen-enriched burner 111, the lower-layer oxygen-enriched burner 112 and the hydrogen burner 12 are turned on;

[0074] The first preset load is greater than the second preset load.

[0075] Specifically, the first preset load can be set to 50% of the unit load, and the second preset load can be set to 35% of the unit load. Therefore, it can be understood that:

[0076] When the output of the coal-fired boiler power generation device 1 is relatively high (higher than 50% load, that is, above the first preset load), since the load of the boiler 10 is relatively high, there is no problem of difficult stable combustion. At this time, the oxygen-enriched burner 11 and the hydrogen burner 12 do not participate in the operation, and only the hot secondary air nozzle burner 14 needs to be turned on; when the output of the coal-fired boiler power generation device 1 is relatively low (50%-35% load, that is, between the first preset load and the second preset load), the hot secondary air nozzle burner 14 (i.e., the ordinary pulverized coal burner) exits, and the upper-layer oxygen-enriched burner 111, the lower-layer oxygen-enriched burner 112 and the hydrogen burner 12 are turned on for operation; when the output of the coal-fired boiler power generation device 1 is extremely low (below 35% load, that is, below the second preset load), only the lower-layer oxygen-enriched burner 112 and the hydrogen burner 12 are kept running. In addition, part of the electricity generated by the generator set 16 can be supplied to the water electrolysis device 3 according to the stable combustion situation of the boiler 10 for electrolyzing water, and the hydrogen and oxygen are temporarily stored in the oxygen storage tank 41 and the hydrogen storage tank 42 to form in-plant energy storage, improving the stable combustion of the boiler 10 and at the same time enhancing the energy storage peak regulation ability of the power plant.

[0077] The above-mentioned implementation manners are only the preferred implementation manners of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the protection scope required by the present invention.

Claims

1. A coal-fired boiler hydrogen-oxygen synergistic enhanced combustion stabilization system, characterized in that: It comprises a coal-fired boiler power generation device (1), a new energy power generation device (2), a water electrolysis device (3) and a storage device (4); The coal-fired boiler power generation device (1) comprises a boiler (10), and an oxygen-enriched burner (11) and a hydrogen burner (12) arranged in the furnace of the boiler (10); The water electrolysis device (3) is electrically connected to the coal-fired boiler power generation device (1) and the new energy power generation device (2) so as to utilize the electric energy provided by the coal-fired boiler power generation device (1) and / or the new energy power generation device (2) to electrolyze water to produce oxygen and hydrogen; The storage device (4) comprises an oxygen storage tank (41) and a hydrogen storage tank (42), The input end of the oxygen storage tank (41) is connected to the oxygen output end of the water electrolysis device (3), and the output end is connected to the oxygen-enriched burner (11); The input end of the hydrogen storage tank (42) is connected to the hydrogen output end of the water electrolysis device (3), and the output end is connected to the hydrogen burner (12).

2. A coal-fired boiler hydrogen-oxygen synergistic enhanced combustion stabilization system according to claim 1, characterized in that: The output end of the oxygen storage tank (41) is connected to the oxygen-enriched burner (11) via an oxygen supply pipeline (5); Along the direction from the oxygen storage tank (41) to the oxygen-enriched burner (11), the oxygen supply pipeline (5) is provided with oxygen purification equipment (51), an oxygen concentration detection meter (52) and an oxygen regulating valve (53) in sequence.

3. A coal-fired boiler hydrogen-oxygen synergistic enhanced combustion stabilization system according to claim 2, characterized in that: The oxygen-enriched burner (11) comprises an upper oxygen-enriched burner (111) and a lower oxygen-enriched burner (112); The oxygen supply pipeline (5) comprises a main pipeline (500), a first branch pipe (501) and a second branch pipe (502); The oxygen purification device (51) and the oxygen concentration detection meter (52) are both arranged on the main pipe (500); The oxygen regulating valve (53) comprises a first oxygen regulating valve (531) and a second oxygen regulating valve (532), wherein the first oxygen regulating valve (531) is located on the first branch pipe (501), and the second oxygen regulating valve (532) is located on the second branch pipe (502); The upper oxygen-enriched burner (111) and the lower oxygen-enriched burner (112) are connected to the output end of the main pipeline (500) through the first branch pipe (501) and the second branch pipe (502), respectively.

4. The hydrogen-oxygen synergistic enhanced combustion stabilization system for coal-fired boilers according to claim 1 is characterized in that: The output end of the hydrogen storage tank (42) is connected to the hydrogen burner (12) via a hydrogen supply pipeline (6); Along the direction from the hydrogen storage tank (42) to the hydrogen burner (12), the hydrogen supply pipeline (6) is provided with a hydrogen purification device (61), a hydrogen concentration detection meter (62) and a hydrogen regulating valve (63) in sequence.

5. The hydrogen-oxygen synergistic enhanced combustion stabilization system for coal-fired boilers according to claim 1 is characterized in that: The oxygen-enriched burner (11) comprises an upper oxygen-enriched burner (111) and a lower oxygen-enriched burner (112); The coal-fired boiler power generation device (1) further comprises a hot secondary air box (13) and a plurality of hot secondary air nozzle burners (14), wherein the hot secondary air nozzle burners (14) are connected to the hot secondary air box (13); Along the boiler (10) from bottom to top, the hydrogen burner (12), one of the hot secondary air nozzle burners (14), the lower oxygen-enriched burner (112), one of the hot secondary air nozzle burners (14), the upper oxygen-enriched burner (111), and one of the hot secondary air nozzle burners (14) are distributed in sequence.

6. A coal-fired boiler hydrogen-oxygen synergistic enhanced combustion stabilization system according to any one of claims 1 to 5, characterized in that: It also includes an electrode boiler (7) and a heating source station (8); The coal-fired boiler power generation device (1) also includes a steam turbine (15) and a generator set (16), wherein the steam output end of the generator set (16) is connected to the input end of the electrode boiler (7), and the output end of the electrode boiler (7) is connected to the heat supply head station (8).

7. A coal-fired boiler hydrogen-oxygen synergistic enhanced combustion stabilization system according to claim 6, characterized in that: The heating primary station (8) is also connected to the steam output end of the boiler (10) via a steam pipeline (9).

8. A combustion stabilization method based on a coal-fired boiler hydrogen-oxygen synergistic enhanced combustion stabilization system according to any one of claims 1 to 7, characterized in that: The following steps are involved: At least the excess electricity of the coal-fired boiler power generation device (1) and / or the new energy power generation device (2) is supplied to the water electrolysis device (3) to produce oxygen and hydrogen; storing the hydrogen and the oxygen; The hydrogen and / or the oxygen are supplied to an oxygen-enriched burner (11) and a hydrogen burner (12) located in the furnace of a boiler (10).

9. The combustion stabilization method according to claim 8, characterized in that: The following steps are also included: Purifying the oxygen and monitoring its concentration before supplying it to the oxygen-enriched burner (11); Before the hydrogen is supplied to the hydrogen burner (12), the hydrogen is purified and its concentration is monitored.

10. The combustion stabilization method according to claim 8, characterized in that: The following steps are also included: When the output of the coal-fired boiler power generation device (1) is higher than a first preset load, the hot secondary air nozzle burner (14) is turned on; When the output of the coal-fired boiler power generation device (1) is lower than a second preset load, the hydrogen burner (12) and the lower oxygen-enriched burner (112) are turned on; When the output of the coal-fired boiler power generation device (1) is between a first preset load and a second preset load, the upper oxygen-enriched burner (111), the lower oxygen-enriched burner (112) and the hydrogen burner (12) are turned on; The first preset load is greater than the second preset load.

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