Biomass oxygen-enriched circulating combustion power generation boiler device adapted to carbon capture

Abstract

This invention relates to the field of power generation boilers and discloses a biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture. The device includes a biomass boiler body with a fluid tank inside and a concentration sensor installed inside. By setting up an oxygen-enriched combustion aid pipe, an external supply of a nitrogen-free mixture of oxygen and carbon dioxide is delivered to the biomass boiler body through the oxygen-enriched combustion aid pipe. Combined with closed-loop regulation by a flow control valve and a concentration sensor, the oxygen concentration in the furnace is stably locked at approximately 30%. Through precise control of the nitrogen-free combustion aid medium and synergistic regulation of anti-coking, the generation of nitrogen oxides is suppressed at the combustion source, and the concentration of carbon dioxide in the flue gas is significantly increased to adapt to carbon capture. Simultaneously, the impact of alkali metal coking on the boiler's heat exchange efficiency is effectively suppressed, ensuring clean, efficient, and stable operation of biomass combustion power generation, and reducing carbon capture costs and equipment maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of power generation boiler technology, specifically to a biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture. Background Technology

[0002] A combustion power generation boiler is a core piece of equipment that converts the chemical energy of fuel into thermal energy through combustion, and then uses the thermal energy to heat water to generate high-temperature and high-pressure steam, which drives a steam turbine to generate electricity. It plays a vital role in thermal power plants and is the first link in energy conversion.

[0003] A biomass combustion boiler is disclosed in publication number CN116398874B. The biomass combustion boiler includes a burner and a boiler connected in sequence. The burner has a flame-spraying pipe communicating with the boiler. A water jacket is fitted around the burner, and the water jacket has an inlet and an outlet. The boiler includes a first end mold, a second end mold, multiple furnace body modules, a widening support, an inlet pipe, and an outlet pipe. The multiple furnace body modules are located between the first end mold and the second end mold. Each furnace body module has a serpentine first water channel and a flame channel penetrating the furnace body module along its thickness direction. The flame channels on adjacent furnace body modules are staggered vertically. The widening support is located between the first end mold and the furnace body modules, between adjacent furnace body modules, and between the furnace body module and the second end mold. The biomass combustion boiler provided by this invention reduces heating time and improves heat exchange efficiency.

[0004] The inventors of this application discovered in their research that the core defect of the aforementioned prior art is that biomass combustion boilers typically supplement oxygen by injecting air, which causes the inside of the biomass combustion boiler to be filled with nitrogen, producing nitrogen oxides and alkali metal coking, thus affecting the heat exchange efficiency of the biomass combustion boiler. Summary of the Invention

[0005] This invention provides a biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture, which solves the problem of nitrogen oxides and alkali metal coking affecting heat exchange efficiency and achieves the effect of suppressing nitrogen oxide generation from the combustion source.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture, comprising a biomass boiler body, a fluid tank inside the biomass boiler body, a concentration sensor installed inside the biomass boiler body, a connecting flange pipe connected to the outside of the biomass boiler body, a flow control valve connected to one end of the connecting flange pipe, an oxygen-enriched combustion-supporting pipe connected to the input end of the flow control valve, a flue gas pipe connected to one side of the biomass boiler body, a flue gas cooler installed at one end of the flue gas pipe, a boiler tube connected to the output end of the flue gas cooler, a filter tower installed at one end of the boiler tube, a gas valve installed at the bottom of the filter tower, a return pipe connected to the output end of the gas valve, a return pipe connected to one side of the biomass boiler body, a heating pipe fixedly connected to the top of the biomass boiler body, a steam pipe connected to the top of the heating pipe, and a nozzle installed outside the biomass boiler body, with a carbon powder pipe connected to the input end of the nozzle.

[0007] By adopting the above technical solutions, the generation of nitrogen oxides can be effectively reduced, the impact of alkali metals on the heat exchange efficiency of biomass combustion boilers can be reduced, and the operational stability of biomass combustion power generation can be improved.

[0008] Preferably, one end of the connecting flange pipe penetrates the outside of the biomass boiler body and is connected to a heat-resistant gas pipe, the top of the heat-resistant gas pipe is connected to a control pipe, the outside of the control pipe is connected to a gas pipe, and an auxiliary frame is fixedly connected inside the control pipe.

[0009] Preferably, the auxiliary frame has an inner sliding rod slidably connected inside, and a limit block is fixedly connected to the bottom of the inner sliding rod.

[0010] Preferably, a rubber piston is fixedly connected to the top of the inner slide rod, and a tension spring is fixedly connected to the bottom of the rubber piston through the top of the auxiliary frame.

[0011] By adopting the above technical solution, the mixed gas of oxygen and carbon dioxide without nitrogen can flow freely inside the control tube, while the control tube can be sealed when the gas stops flowing, effectively preventing the flue gas from flowing back along the control tube.

[0012] Preferably, the outside of the return pipe is connected to a return filter body, and a filter element groove is formed on the top of the return filter body.

[0013] Preferably, a snap-fit ​​body is fixedly connected to the top of the return filter body, the top of the snap-fit ​​body is provided with a sliding groove, and a guide rod is fixedly connected inside the snap-fit ​​body.

[0014] Preferably, a sliding block is slidably connected to the outside of the guide rod, the sliding block is slidably connected to the inside of the locking body, a push block is fixedly connected to the top of the sliding block, and a limit spring is fixedly connected to one side of the sliding block through the inside of the locking body.

[0015] Preferably, a telescopic rod is fixedly connected inside the recirculation filter body, a top block is fixedly connected to the top of the telescopic rod, the top block is slidably connected to the outside of the recirculation filter body, and a release spring is fixedly connected to the bottom of the top block inside the recirculation filter body.

[0016] Preferably, a clamping plate is inserted inside the reflux filter body, and a filter element is abutted inside the clamping plate.

[0017] Preferably, a plug-in block is inserted into the outside of the clamping plate, the bottom of the plug-in block has a plug-in groove, and the top of the plug-in block has a limit groove.

[0018] By adopting the above technical solution, the filter can effectively filter the dust inside the flue gas in the return pipe, thereby preventing the dust from re-entering the biomass boiler body and making the filter element easy to disassemble and replace.

[0019] This invention provides a biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture. It has the following beneficial effects: 1. This invention, by setting up an oxygen-enriched combustion-supporting pipe, allows the external supply to deliver a mixture of nitrogen-free oxygen and carbon dioxide gas to the biomass boiler body through the oxygen-enriched combustion-supporting pipe. With the closed-loop regulation of the flow control valve and concentration sensor, the oxygen concentration in the furnace is stably locked at about 30%. Through the precise control of the nitrogen-free combustion-supporting medium and the synergistic regulation of anti-coking, it achieves the suppression of nitrogen oxide generation from the combustion source, significantly increases the carbon dioxide concentration in the flue gas to adapt to carbon capture, and effectively suppresses the impact of alkali metal coking on the boiler heat exchange efficiency. This ensures the clean, efficient, and stable operation of biomass combustion power generation, and reduces carbon capture costs and equipment operation and maintenance costs.

[0020] 2. This invention, by setting up a control tube, allows the high pressure of the nitrogen-free oxygen and carbon dioxide mixture entering the control tube to lift the rubber piston and stretch the tension spring. As the rubber piston rises, the gas pipe connects to the control tube, allowing the nitrogen-free oxygen and carbon dioxide mixture to smoothly enter the biomass boiler body. Furthermore, when there is no gas inside the control tube, the rubber piston resets, closing the gas pipe connection. This effectively prevents boiler flue gas from entering the connecting flange pipe, solving the problem of flue gas easily flowing back along the pipeline.

[0021] 3. By setting up a filter element, the present invention enables the filter element to filter the flue gas. Furthermore, by setting up a release structure and a snap-fit ​​structure, the insert block and clamping plate can easily install the filter element into the interior of the flue gas filter body, and also allow the filter element to be easily released, thus facilitating filter element replacement and solving the problem of filter element being inconvenient to disassemble, replace and install. Attached Figure Description

[0022] Figure 1 This is an overall perspective view of the present invention; Figure 2 This is a cross-sectional view of the biomass boiler body of the present invention; Figure 3 This is a schematic diagram of the heating element of the present invention; Figure 4 This is an exploded view of the recirculation filter body of the present invention; Figure 5 This is a schematic diagram of the recirculation filter body of the present invention; Figure 6 This is a cross-sectional view of the sliding block of the present invention; Figure 7 This is a schematic diagram of the top block of the present invention; Figure 8 This is an enlarged view of point A in the present invention; Figure 9 This is an enlarged view of section B of the present invention; Figure 10 This is an enlarged view of point C in the present invention.

[0023] The components include: 1. Biomass boiler body; 2. Steam pipe; 3. Carbon powder pipe; 4. Flue gas cooler; 5. Boiler tube; 6. Filter tower; 7. Gas valve; 8. Return pipe; 9. Nozzle; 10. Flue gas tank; 11. Concentration sensor; 12. Heating pipe; 13. Heat-resistant gas pipe; 14. Control pipe; 15. Flue gas pipe; 16. Return filter body; 17. Connecting block; 18. Connecting groove; 19. Limiting groove; 20. Clamping plate; 21. Filter element; 22. Snap-fit ​​body; 23. Slide groove; 24. Filter element groove; 25. Guide rod; 26. Limiting spring; 27. Sliding block; 28. Push block; 29. ​​Telescopic rod; 30. Release spring; 31. Top block; 32. Flow control valve; 33. Oxygen-enriched combustion tube; 34. Gas tube; 35. Auxiliary frame; 36. Inner slide rod; 37. Limiting block; 38. Tension spring; 39. Rubber piston; 40. Connecting flange tube. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see the appendix Figure 1 - Appendix Figure 10 This invention provides a biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture, including a biomass boiler body 1. A fluid tank 10 is provided inside the biomass boiler body 1. A concentration sensor 11 is installed inside the biomass boiler body 1. A connecting flange pipe 40 is connected to the outside of the biomass boiler body 1. One end of the connecting flange pipe 40 is connected to a flow control valve 32. The input end of the flow control valve 32 is connected to an oxygen-enriched combustion aid pipe 33. A flue gas pipe 15 is connected to one side of the biomass boiler body 1. A flue gas cooler 4 is installed at one end of the flue gas pipe 15. The output end of the flue gas cooler 4 is connected to a boiler tube 5. A filter tower 6 is installed at one end of the boiler tube 5. A gas valve 7 is installed at the bottom of the filter tower 6. The output end of the gas valve 7 is connected to a return pipe 8. One end of the return pipe 8 is connected to one side of the biomass boiler body 1. A heating pipe 12 is fixedly connected to the top of the biomass boiler body 1. A steam pipe 2 is connected to the top of the heating pipe 12. A nozzle 9 is installed outside the biomass boiler body 1. The input end of the nozzle 9 is connected to a carbon powder pipe 3.

[0026] Specifically, a mixture of nitrogen-free oxygen and carbon dioxide enters the biomass boiler body 1 through the oxygen-enriched combustion pipe 33. With the closed-loop control of the flow control valve 32 and the concentration sensor 11, the oxygen concentration inside the biomass boiler body 1 is stably locked at about 30%. The return pipe 8 addresses the problem of alkali metal slagging in biomass by optimizing the circulating combustion process, returning the low-temperature circulating flue gas to the burner nozzle 9 inlet to dilute the heat load. At the same time, the large-volume radiant structure and flue flow layout of the biomass boiler body 1 are improved. High-temperature steam drives the power generation unit to operate, and high-concentration CO2 flue gas is directly connected to the carbon capture system inside the filter tower 6.

[0027] Please see the appendix Figure 2 and attached Figure 10 One end of the connecting flange pipe 40 passes through the outside of the biomass boiler body 1 and is connected to a heat-resistant gas pipe 13. The top of the heat-resistant gas pipe 13 is connected to a control pipe 14. The outside of the control pipe 14 is connected to a gas pipe 34. An auxiliary frame 35 is fixedly connected inside the control pipe 14. An inner slide rod 36 is slidably connected inside the auxiliary frame 35. A limit block 37 is fixedly connected to the bottom of the inner slide rod 36. A rubber piston 39 is fixedly connected to the top of the inner slide rod 36. A tension spring 38 is fixedly connected to the bottom of the rubber piston 39 through the top of the auxiliary frame 35.

[0028] Specifically, during the process of the nitrogen-free oxygen and carbon dioxide mixture entering the biomass boiler body 1 through the oxygen-enriched combustion pipe 33, the gas pressure inside the control pipe 14 decreases, causing the gas pressure on one side of the bottom of the rubber piston 39 to rise. At this time, the rubber piston 39 rises under the influence of gas pressure, the inner slide rod 36 slides inside the auxiliary frame 35, and the tension spring 38 is stretched. At this time, the control pipe 14 is connected to the gas pipe 34, and the nitrogen-free oxygen and carbon dioxide mixture smoothly enters the biomass boiler body 1. Similarly, when the control pipe 14 is no longer filled with gas, the rubber piston 39 seals on one side of the gas pipe 34, effectively preventing flue gas backflow.

[0029] Please see the appendix Figure 2 , Figure 4 , Figure 5 , Figure 6 and attached Figure 7 The return pipe 8 is externally connected to a return filter body 16. A filter element groove 24 is formed at the top of the return filter body 16. A snap-fit ​​body 22 is fixedly connected to the top of the return filter body 16. A sliding groove 23 is formed at the top of the snap-fit ​​body 22. A guide rod 25 is fixedly connected inside the snap-fit ​​body 22. A sliding block 27 is slidably connected to the outside of the guide rod 25. The sliding block 27 is slidably connected to the inside of the snap-fit ​​body 22. A push block 28 is fixedly connected to the top of the sliding block 27. One side of the sliding block 27 is fixedly connected to the inside of the snap-fit ​​body 22. A limiting spring 26 is provided. A telescopic rod 29 is fixedly connected inside the return filter body 16. A top block 31 is fixedly connected to the top of the telescopic rod 29. The top block 31 is slidably connected to the outside of the return filter body 16. A release spring 30 is fixedly connected to the bottom of the top block 31 through the inside of the return filter body 16. A clamping plate 20 is inserted inside the return filter body 16. A filter core 21 is abutted inside the clamping plate 20. An insertion block 17 is inserted outside the clamping plate 20. An insertion groove 18 is opened at the bottom of the insertion block 17. A limiting groove 19 is opened at the top of the insertion block 17.

[0030] Specifically, after clamping the filter element 21, the clamp 20 can be inserted into the bottom of the plug-in block 17 for fixation. Then, the clamp 20 and the plug-in block 17 are inserted into the filter element groove 24. The plug-in block 17 abuts against the top of the top block 31. The telescopic rod 29 and the release spring 30 are compressed and abut against the inclined edge of the top of the sliding block 27, causing the sliding block 27 to retract into the clamping body 22. The sliding block 27 slides outside the guide rod 25. The limiting spring 26 is compressed until the plug-in block 17 is installed. Then, the sliding block 27 resets and clamps against both sides of the limiting groove 19, further limiting the filter element 21. Similarly, by actively pressing the push block 28 and the sliding block 27, the top block 31 can lift the plug-in block 17.

[0031] Working Principle: A mixture of nitrogen-free oxygen and carbon dioxide enters the biomass boiler body 1 through the oxygen-enriched combustion pipe 33. With the closed-loop control of the flow control valve 32 and concentration sensor 11, the oxygen concentration inside the biomass boiler body 1 is stably locked at approximately 30%. The return pipe 8 addresses the issue of alkali metal slagging in biomass by optimizing the circulating combustion process, returning low-temperature circulating flue gas to the burner nozzle 9 inlet to dilute the heat load. Simultaneously, the large-volume radiant structure and flue gas flow layout of the biomass boiler body 1 are improved. High-temperature steam drives the power generation unit, and high-concentration CO2 flue gas directly connects to the carbon capture system inside the filter tower 6. During the process of the nitrogen-free oxygen and carbon dioxide mixture entering the biomass boiler body 1 through the oxygen-enriched combustion pipe 33, the air pressure inside the control pipe 14 decreases, causing the air pressure on one side of the bottom of the rubber piston 39 to rise. At this time, the rubber piston 39 rises under the influence of air pressure, the inner sliding rod 36 slides inside the auxiliary frame 35, and the tension spring 38 is stretched. At this time, the control pipe 1... 4. Connected to gas pipe 34, a mixture of oxygen and carbon dioxide without nitrogen smoothly enters the biomass boiler body 1. Similarly, when the control pipe 14 is no longer filled with gas, the rubber piston 39 seals one side of the gas pipe 34, effectively preventing flue gas backflow. After clamping the filter element 21, the clamp 20 can be inserted into the bottom of the plug-in block 17 for fixation. Then, the clamp 20 and the plug-in block 17 are inserted into the filter element groove 24, with the plug-in block 17 abutting against the top of the top block 31. The retracting rod 29 and the release spring 30 are compressed and abut against the inclined edge of the top of the sliding block 27, causing the sliding block 27 to retract into the interior of the locking body 22. The sliding block 27 slides outside the guide rod 25, and the limiting spring 26 is compressed until the plug-in block 17 is installed. Then the sliding block 27 resets and locks into both sides of the limiting groove 19, further limiting the filter core 21. Similarly, by actively pressing the push block 28 and the sliding block 27, the top block 31 can lift the plug-in block 17.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture, comprising a biomass boiler body (1), characterized in that, The biomass boiler body (1) has a fluid tank (10) inside, a concentration sensor (11) is installed inside the biomass boiler body (1), a connecting flange pipe (40) is connected to the outside of the biomass boiler body (1), a flow control valve (32) is connected to one end of the connecting flange pipe (40), an oxygen-enriched combustion pipe (33) is connected to the input end of the flow control valve (32), a flue gas pipe (15) is connected to one side of the biomass boiler body (1), a flue gas cooler (4) is installed at one end of the flue gas pipe (15), and the output of the flue gas cooler (4) is... A boiler tube (5) is connected to one end of the boiler tube (5). A filter tower (6) is installed at one end of the boiler tube (5). A gas valve (7) is installed at the bottom of the filter tower (6). A return pipe (8) is connected to the output end of the gas valve (7). One end of the return pipe (8) is connected to one side of the biomass boiler body (1). A heating pipe (12) is fixedly connected to the top of the biomass boiler body (1). A steam pipe (2) is connected to the top of the heating pipe (12). A nozzle (9) is installed on the outside of the biomass boiler body (1). A carbon powder pipe (3) is connected to the input end of the nozzle (9).

2. The biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 1, characterized in that, One end of the connecting flange pipe (40) passes through the outside of the biomass boiler body (1) and is connected to a heat-resistant gas pipe (13). The top of the heat-resistant gas pipe (13) is connected to a control pipe (14). The outside of the control pipe (14) is connected to a gas pipe (34). An auxiliary frame (35) is fixedly connected inside the control pipe (14).

3. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 2, characterized in that, The auxiliary frame (35) has an inner slide rod (36) slidably connected inside, and a limit block (37) is fixedly connected to the bottom of the inner slide rod (36).

4. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 3, characterized in that, A rubber piston (39) is fixedly connected to the top of the inner slide rod (36), and a tension spring (38) is fixedly connected to the bottom of the rubber piston (39) through the top of the auxiliary frame (35).

5. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 1, characterized in that, The outside of the return pipe (8) is connected to the return filter body (16), and the top of the return filter body (16) is provided with a filter element groove (24).

6. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 5, characterized in that, The top of the return filter body (16) is fixedly connected to a snap-fit ​​body (22), the top of the snap-fit ​​body (22) is provided with a sliding groove (23), and the inside of the snap-fit ​​body (22) is fixedly connected to a guide rod (25).

7. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 6, characterized in that, The guide rod (25) is slidably connected to a sliding block (27), which is slidably connected to the inside of the locking body (22). A push block (28) is fixedly connected to the top of the sliding block (27), and a limit spring (26) is fixedly connected to one side of the sliding block (27) through the inside of the locking body (22).

8. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 5, characterized in that, The recirculation filter body (16) is internally fixedly connected to a telescopic rod (29), the top of the telescopic rod (29) is fixedly connected to a top block (31), the top block (31) is externally slidably connected to the inside of the recirculation filter body (16), and the bottom of the top block (31) is fixedly connected to a release spring (30) through the inside of the recirculation filter body (16).

9. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 5, characterized in that, A clamping plate (20) is inserted inside the reflux filter body (16), and a filter element (21) is abutted inside the clamping plate (20).

10. A biomass oxygen-enriched circulating combustion power generation boiler device adapted for carbon capture according to claim 9, characterized in that, The clamping plate (20) is connected to a plug-in block (17), the bottom of the plug-in block (17) is provided with a plug-in groove (18), and the top of the plug-in block (17) is provided with a limiting groove (19).

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