Flue gas recirculation device for biomass power generation

Abstract

The utility model discloses a flue gas recirculation device for biomass power generation, which belongs to the technical field of biomass power generation and comprises a bottom plate, two supports are arranged at the top of the bottom plate, a main boiler is fixedly sleeved on one support, an auxiliary boiler is fixedly sleeved on the other support, and a boiler cover is mounted at the top of the main boiler in a threaded manner. According to the device, biomass materials are ignited and combusted through the main boiler, fuel gas generated by combustion enters the treatment box from the smoke outlet pipe, the filter pipe and the smoke guide pipe, nitric oxide in smoke is removed through alkali liquor in an inner cavity of the treatment box, and the quality of follow-up smoke recirculation combustion is guaranteed; and in addition, the smoke in the treatment box is pumped into the auxiliary boiler through the induced draft fan and the smoke return pipe to be combusted again, the influence of the smoke on biomass combustion in the main boiler in the smoke recycling process is avoided, and the practicability of the smoke recycling device for biomass power generation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of biomass power generation, in particular to a flue gas recirculation device for biomass power generation. Background Art

[0002] Biomass power generation utilizes the biomass energy of biomass. It is a form of renewable energy generation, encompassing direct combustion of agricultural and forestry waste, gasification of agricultural and forestry waste, waste incineration, landfill gas, and biogas. Biomass boilers utilize renewable energy to generate electricity. Flue gas recirculation is the process by which a portion of the flue gas produced by combustion is mixed with an oxidant and then recombined into combustion.

[0003] After searching, the utility model patent with announcement number CN214198636U discloses a flue gas recirculation device for biomass power generation, including a support, a boiler, a smoke outlet, a feed inlet, a first pipe, a gas flow control valve, a burner, a second pipe, an induced draft fan, a third pipe, and a partition. The boiler is welded on the support, the smoke outlet is arranged on the upper surface of the boiler, the feed inlet is arranged next to the smoke outlet, the smoke outlet is connected to the first pipe, the first pipe is connected to the burner inlet, the gas flow control valve is installed on the first pipe, the burner outlet is connected to the second pipe, the second pipe is connected to the air inlet of the induced draft fan, the induced draft fan outlet is connected to the third pipe, the third pipe is connected to the boiler, and the partition is installed in the furnace of the boiler. This patent reduces the concentration of nitrogen oxides in the flue gas through the flue gas recirculation device, saves energy, increases efficiency, and is green, environmentally friendly and pollution-free.

[0004] However, the above patent still has the following shortcomings: the combustion gas guided back to the boiler through the third pipe will have less heat than the biomass combustion in the boiler. When the flue gas is directly guided back to the biomass combustion boiler for re-combustion, it will affect the heat generated by the original biomass combustion in the boiler. At the same time, the flue gas will be circulated multiple times subsequently, which will cause some flue gas that can no longer be burned to be guided back to the boiler, affecting the working quality of biomass power generation; in addition, the smoke dust in the flue gas is not processed when the flue gas is discharged. The smoke dust adheres to the inner wall of the pipe and affects the subsequent discharge of the flue gas. For this reason, we propose a flue gas recycling device for biomass power generation. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a flue gas recirculation device for biomass power generation.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A flue gas recirculation device for biomass power generation comprises a base plate, two supports are provided on the top of the base plate, a main boiler is fixedly sleeved on one of the supports, an auxiliary boiler is fixedly sleeved on the other support, a furnace cover is threadedly installed on the top of the main boiler, a smoke outlet pipe is fixedly sleeved on the middle part of the furnace cover, a treatment box is fixedly connected to the top surface of the base plate, a smoke guide pipe is fixedly sleeved on the top of the treatment box, a filtering mechanism is provided between the smoke guide pipe and the smoke outlet pipe, a spraying mechanism is provided on the side of the treatment box, an induced draft fan is fixedly installed on the top surface of the treatment box, the input end of the induced draft fan extends to the inner cavity of the treatment box, the output end of the induced draft fan is fixedly connected to the return smoke pipe, the end of the return smoke pipe is fixedly sleeved on the inner cavity of the auxiliary boiler, and a feeding port is provided on the top of the furnace cover.

[0008] As a preferred solution of the present invention, the filtering mechanism includes a filter tube fixedly sleeved between the smoke outlet pipe and the smoke guide pipe, two ash boxes are provided at the bottom of the filter tube, a coarse filter is fixedly sleeved in the inner cavity of the filter tube, the end face of the coarse filter is flush with the inner wall of one ash box, a fine filter is fixedly sleeved in the inner cavity of the filter tube, the end face of the fine filter is flush with the inner wall of another ash box, the coarse filter and the fine filter are rotatably connected to a transmission shaft, the end of the transmission shaft is fixedly connected to a wind wheel, and the side of the transmission shaft is fixedly connected to two scrapers, and the side faces of the two scrapers are respectively in contact with the end faces of the coarse filter and the fine filter.

[0009] As a preferred solution of the present invention, the spraying mechanism includes a water pump fixedly mounted on the side of the treatment box, the input end of the water pump extends to the inner cavity of the treatment box, the output end of the water pump is fixedly connected to a liquid guide tube, the end of the liquid guide tube is fixedly sleeved to the inner cavity of the treatment box and fixedly sleeved with a spray box, and a plurality of spray holes are provided on the bottom surface of the spray box.

[0010] As a preferred solution of the present invention, a threaded plug is threadedly mounted on the top surface of the processing box, and the bottom end of the threaded plug extends to the inner cavity of the processing box.

[0011] As a preferred solution of the present invention, a drain valve is fixedly installed on the side of the processing box, and the end of the drain valve extends to the bottom of the inner cavity of the processing box.

[0012] As a preferred solution of the present invention, sealing doors are hingedly connected to the outer sides of the two ash collection boxes.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] (1) In the present invention, the main boiler is used to ignite and burn the biomass material, and the combustion gas enters the treatment box through the smoke outlet pipe, the filter pipe, and the smoke guide pipe. The alkaline solution in the inner cavity of the treatment box is used to remove nitrogen oxides in the flue gas to ensure the quality of subsequent flue gas recycling combustion. In addition, the flue gas in the treatment box is drawn into the auxiliary boiler through the induced draft fan and the return smoke pipe for re-combustion, thereby avoiding the impact of the flue gas on the biomass combustion in the main boiler during the flue gas recycling process.

[0015] (2) In the present invention, the coarse filter and the fine filter in the filter tube are used to filter the smoke dust in the smoke, thereby realizing the function of cleaning the smoke dust in the smoke. In addition, the filtered smoke drives the wind wheel to rotate, and the wind wheel drives the transmission shaft and the scraper to rotate, and the scraper is used to scrape the filter surface of the coarse filter and the fine filter, thereby cleaning the smoke dust filtered by the filter surface of the coarse filter and the fine filter, and causing the smoke dust to fall into the inner cavity of the ash box for collection, thereby avoiding clogging of the coarse filter and the fine filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the auxiliary boiler of the utility model;

[0018] Figure 3 This is a schematic cross-sectional view of the processing box of the utility model;

[0019] Figure 4 It is a cross-sectional schematic diagram of the filter tube of the present invention.

[0020] Description of the numbers in the figure:

[0021] 1. Bottom plate; 2. Support; 3. Main boiler; 4. Auxiliary boiler; 5. Furnace cover; 6. Smoke outlet pipe; 7. Filter mechanism; 8. Treatment box; 9. Smoke guide pipe; 10. Spray mechanism; 11. Induced draft fan; 12. Smoke return pipe; 13. Drain valve; 14. Threaded plug; 15. Feeding port; 16. Filter pipe; 17. Ash collection box; 18. Sealing door; 19. Coarse filter; 20. Fine filter; 21. Drive shaft; 22. Scraper; 23. Wind wheel; 24. Water pump; 25. Liquid guide pipe; 26. Spray box; 27. Spray hole. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0025] Example:

[0026] See also Figure 1-4 A flue gas recirculation device for biomass power generation includes a base plate 1, two supports 2 are provided on the top of the base plate 1, a main boiler 3 is fixedly sleeved on one support 2, and an auxiliary boiler 4 is fixedly sleeved on the other support 2, a furnace cover 5 is threadedly installed on the top of the main boiler 3, a smoke outlet pipe 6 is fixedly sleeved in the middle of the furnace cover 5, a treatment box 8 is fixedly connected to the top surface of the base plate 1, a smoke guide pipe 9 is fixedly sleeved on the top of the treatment box 8, a filtering mechanism 7 is provided between the smoke guide pipe 9 and the smoke outlet pipe 6, a spraying mechanism 10 is provided on the side of the treatment box 8, an induced draft fan 11 is fixedly installed on the top surface of the treatment box 8, the input end of the induced draft fan 11 extends to the inner cavity of the treatment box 8, the output end of the induced draft fan 11 is fixedly connected to the return smoke pipe 12, the end of the return smoke pipe 12 is fixedly sleeved to the inner cavity of the auxiliary boiler 4, and a feeding port 15 is provided on the top of the furnace cover 5.

[0027] In this embodiment, biomass material is added into the main boiler 3 through the feeding port 15 .

[0028] For details, please refer to Figure 1 and Figure 4 The filtering mechanism 7 includes a filter tube 16 fixedly sleeved between the smoke outlet pipe 6 and the smoke guide pipe 9. Two ash boxes 17 are provided at the bottom of the filter tube 16. A coarse filter screen 19 is fixedly sleeved in the inner cavity of the filter tube 16. The end face of the coarse filter screen 19 is flush with the inner wall of one ash box 17. A fine filter screen 20 is fixedly sleeved in the inner cavity of the filter tube 16. The end face of the fine filter screen 20 is flush with the inner wall of another ash box 17. The coarse filter screen 19 and the fine filter screen 20 are rotatably connected to the transmission shaft 21. The end of the transmission shaft 21 is fixedly connected to a wind wheel 23. Two scrapers 22 are fixedly connected to the side of the transmission shaft 21. The sides of the two scrapers 22 are respectively in contact with the end faces of the coarse filter screen 19 and the fine filter screen 20.

[0029] In this embodiment, the filter holes of the coarse filter 19 are larger than the filter holes of the fine filter 20. The coarse filter 19 is used to filter a larger volume of smoke and dust, and the fine filter 20 is used to filter a smaller volume of smoke and dust.

[0030] For details, please refer to Figure 1 and Figure 3 The spraying mechanism 10 includes a water pump 24 fixedly mounted on the side of the treatment box 8. The input end of the water pump 24 extends to the inner cavity of the treatment box 8. The output end of the water pump 24 is fixedly connected to a liquid guide tube 25. The end of the liquid guide tube 25 is fixedly sleeved to the inner cavity of the treatment box 8 and fixedly sleeved with a spray box 26. A plurality of spray holes 27 are provided on the bottom surface of the spray box 26.

[0031] In this embodiment, the alkali solution in the treatment box 8 is pumped into the spray box 26 by the water pump 24, and the alkali solution in the spray box 26 is sprayed through the spray holes 27 to contact the flue gas, thereby cleaning the nitrogen oxides in the flue gas.

[0032] For details, please refer to Figure 2 A threaded plug 14 is threadedly installed on the top surface of the processing box 8, and the bottom end of the threaded plug 14 extends to the inner cavity of the processing box 8.

[0033] In this embodiment, the threaded plug 14 is removed and an alkaline solution for absorbing nitrogen oxides, such as a sodium hydroxide solution or a calcium hydroxide solution, is injected into the inner cavity of the threaded plug 14 .

[0034] For details, please refer to Figure 3 A drain valve 13 is fixedly installed on the side of the processing box 8, and the end of the drain valve 13 extends to the bottom of the inner cavity of the processing box 8.

[0035] In this embodiment, the alkaline liquid in the inner cavity of the treatment box 8 is discharged through the drain valve 13, such as sodium hydroxide solution and calcium hydroxide solution.

[0036] For details, please refer to Figure 4The outer sides of the two ash collecting boxes 17 are respectively hinged with sealing doors 18.

[0037] In this embodiment, the smoke and dust collected in the inner cavity of the ash box 17 is processed by opening the sealing door 18 .

[0038] Working principle: When in use, first add biomass material to the main boiler 3 from the feeding port 15, ignite the biomass material to generate heat for subsequent power generation, and the flue gas generated by the combustion of biomass is discharged from the smoke outlet pipe 6, and the flue gas enters the filter tube 16, and then the coarse filter 19 and the fine filter 20 in the inner cavity of the filter tube 16 are used to filter the smoke in the smoke, and the filtered smoke drives the wind wheel 23 to rotate, and the wind wheel 23 drives the transmission shaft 21 and the scraper 22 to rotate, and the scraper 22 is used to scrape the filter surface of the coarse filter 19 and the fine filter 20, so as to clean up the smoke and dust filtered by the filter surface of the coarse filter 19 and the fine filter 20, and The smoke is allowed to fall into the inner cavity of the ash box 17 and be collected. The filtered smoke is then introduced into the inner cavity of the treatment box 8 through the smoke guide pipe 9. The water pump 24 is started to draw the alkali liquid at the bottom of the inner cavity of the treatment box 8 from the liquid guide pipe 25 to the inner cavity of the spray box 26. In addition, the alkali liquid in the spray box 26 is sprayed out from the spray hole 27 and contacts the smoke in the inner cavity of the treatment box 8. The alkali liquid is used to remove the nitrogen oxides in the smoke. Finally, the induced draft fan 11 is started to draw the smoke from the inner cavity of the treatment box 8, and the return smoke pipe 12 introduces the smoke into the auxiliary boiler 4, and the smoke is re-ignited in the auxiliary boiler 4 so that the energy in the smoke is released again and the energy is used to generate electricity.

[0039] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and improved ideas of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flue gas recirculation device for biomass power generation, comprising a bottom plate (1), characterized in that: Two supports (2) are provided on the top of the bottom plate (1), a main boiler (3) is fixedly sleeved on one of the supports (2), and an auxiliary boiler (4) is fixedly sleeved on the other support (2), a furnace cover (5) is threadedly mounted on the top of the main boiler (3), a smoke outlet pipe (6) is fixedly sleeved in the middle of the furnace cover (5), a processing box (8) is fixedly connected to the top surface of the bottom plate (1), a smoke guide pipe (9) is fixedly sleeved on the top of the processing box (8), and the smoke guide pipe (9) and the outlet pipe (6) are fixedly sleeved. A filtering mechanism (7) is provided between the smoke pipes (6), a spraying mechanism (10) is provided on the side of the treatment box (8), an induced draft fan (11) is fixedly installed on the top surface of the treatment box (8), the input end of the induced draft fan (11) extends to the inner cavity of the treatment box (8), the output end of the induced draft fan (11) is fixedly connected to a return smoke pipe (12), the end of the return smoke pipe (12) is fixedly sleeved to the inner cavity of the auxiliary boiler (4), and a feeding port (15) is provided on the top of the furnace cover (5).

2. The flue gas recirculation device for biomass power generation according to claim 1, characterized in that: The filtering mechanism (7) comprises a filter tube (16) fixedly sleeved between the smoke outlet pipe (6) and the smoke guide pipe (9), two ash boxes (17) are provided at the bottom of the filter tube (16), a coarse filter (19) is fixedly sleeved in the inner cavity of the filter tube (16), the end surface of the coarse filter (19) is flush with the inner wall of one ash box (17), a fine filter (20) is fixedly sleeved in the inner cavity of the filter tube (16), the end surface of the fine filter (20) is flush with the inner wall of the other ash box (17), a transmission shaft (21) is rotatably connected to the coarse filter (19) and the fine filter (20), the end of the transmission shaft (21) is fixedly connected to a wind wheel (23), and two scrapers (22) are fixedly connected to the side of the transmission shaft (21), and the side surfaces of the two scrapers (22) are respectively in contact with the end surfaces of the coarse filter (19) and the fine filter (20).

3. The flue gas recirculation device for biomass power generation according to claim 1, characterized in that: The spraying mechanism (10) comprises a water pump (24) fixedly mounted on the side of the treatment box (8), the input end of the water pump (24) extending into the inner cavity of the treatment box (8), the output end of the water pump (24) fixedly connected to a liquid guide tube (25), the end of the liquid guide tube (25) fixedly sleeved into the inner cavity of the treatment box (8) and fixedly sleeved with a spray box (26), the bottom surface of the spray box (26) being provided with a plurality of spray holes (27).

4. The flue gas recirculation device for biomass power generation according to claim 1, characterized in that: A threaded plug (14) is threadedly mounted on the top surface of the processing box (8), and the bottom end of the threaded plug (14) extends to the inner cavity of the processing box (8).

5. The flue gas recirculation device for biomass power generation according to claim 1, characterized in that: A drain valve (13) is fixedly mounted on the side of the processing box (8), and the end of the drain valve (13) extends to the bottom of the inner cavity of the processing box (8).

6. The flue gas recirculation device for biomass power generation according to claim 2, characterized in that: The outer sides of the two ash collecting boxes (17) are respectively hinged with sealing doors (18).

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