Biomass oxygen-enriched circulating combustion anti-coking heat exchange device

Abstract

The present application relates to the technical field of boiler anti-coking, and discloses a biomass oxygen-enriched circulating combustion anti-coking heat exchange device, which comprises a heat exchange device main body, a first belt pulley rotatably connected to the top of the heat exchange device main body, a fan blade roller fixedly connected to the bottom of the first belt pulley and penetrating through the top of the heat exchange device main body, a disturbance fan blade fixedly connected to the outside of the fan blade roller, a heat exchange pipe fixedly connected to the inside of the heat exchange device main body, a liquid pipe communicated with the input end of the heat exchange pipe, and a biomass furnace body communicated with one side of the heat exchange device main body. The fan blade roller drives the disturbance fan blade to rotate as a whole, and the heat exchange pipe is externally wound, so that the heat exchange pipe structure is optimized and the circulating flue gas disturbance is designed, the alkali metal coking deposition is inhibited from the flow field and structure level, the boiler heat exchange efficiency is stabilized, and the flue gas coking outside the heat exchange pipe is reduced, thereby solving the problem that the heat exchange device main body is affected by flue gas, leading to alkali metal coking deposition and affecting the boiler heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of boiler anti-coking technology, specifically to a biomass oxygen-enriched circulating combustion anti-coking heat exchange device. Background Technology

[0002] The heat exchange device in a biomass boiler is the core component that transfers the heat generated by the combustion of biomass fuel to water, steam, or air. It efficiently transfers the heat from the high-temperature flue gas released by combustion to the heat transport medium through the metal wall, reducing the exhaust temperature and thermal pollution. Some heat exchange structures work in conjunction with dust removal and denitrification devices, which also helps with subsequent flue gas purification.

[0003] Existing biomass oxygen-enriched circulating combustion anti-coking heat exchange devices are based on the heat transfer process of metal walls. They utilize the temperature difference between high-temperature flue gas and low-temperature medium, and use three methods—heat conduction, convection, and heat radiation—to efficiently transfer heat from the flue gas side to the medium side, thereby achieving thermal energy conversion.

[0004] The inventors of this application discovered in their research that the core defect of the above-mentioned prior art is that in the biomass oxygen-enriched circulating combustion anti-coking heat exchange device, some ash produced after fuel combustion melts at high temperature and, along with the flow of flue gas, sticks to the relatively cold heat exchange tubes, and then cools and hardens, accumulating into hard coke. Summary of the Invention

[0005] This invention provides a biomass oxygen-enriched circulating combustion anti-coking heat exchange device, which solves the problem of fuel material melting at high temperature and coking accompanied by flue gas flow, and achieves the effect of reducing coking by flue gas disturbance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a biomass oxygen-enriched circulating combustion anti-coking heat exchange device, comprising a heat exchange device body, a first pulley rotatably connected to the top of the heat exchange device body, a fan roller fixedly connected to the bottom of the first pulley penetrating the top of the heat exchange device body, a disturbance fan blade fixedly connected to the outside of the fan roller, a heat exchange tube fixedly connected inside the heat exchange device body, a liquid pipe connected to the input end of the heat exchange tube, a biomass furnace body connected to one side of the heat exchange device body, a connecting bolt connected to one side of the biomass furnace body via an external thread of the heat exchange device body, a furnace body plate fixedly connected inside the biomass furnace body, a connecting pipe connected to the outside of the heat exchange device body, a filter tower connected to one end of the connecting pipe, a return pipe connected to the output end of the filter tower, and a return pipe connected to one side of the biomass furnace body.

[0007] By adopting the above technical solutions, the industry pain points of heat exchange failure and insufficient carbon capture adaptability caused by coking during biomass fuel combustion are addressed. A dedicated heat exchange device is designed based on the core architecture of circulating combustion. The oxygen-enriched and nitrogen-free combustion method is used to achieve low nitrogen emissions and high-concentration carbon dioxide production, which matches the subsequent carbon capture and fixation requirements. Through the optimization of heat exchange tube structure and the design of circulating flue gas disturbance, alkali metal coking deposition is suppressed from the flow field and structural levels, thereby stabilizing the boiler heat exchange efficiency.

[0008] Preferably, a desiccant removal body is fixedly connected to the bottom of the fan roller, an arc-shaped block is fixedly connected to the outside of the desiccant removal body, a hollow rod is slidably connected inside the arc-shaped block, and a pull plate is fixedly connected to the outside of the hollow rod.

[0009] Preferably, the hollow rod has an inner sliding groove inside, and a sliding block is slidably connected to the outside of the hollow rod.

[0010] Preferably, both ends of the hollow rod are fixedly connected to tension springs through the internal connections of the bow-shaped block and the sliding block. The internal connections of the bow-shaped block and the sliding block are both fixedly connected to built-in rods, and the external connections of the built-in rods are slidably connected to the internal connections of the hollow rod.

[0011] Preferably, a fixing block is fixedly connected to one side of the sliding block, and a decoking hammer is fixedly connected inside the fixing block.

[0012] Preferably, a second limiting base is fixedly connected inside the biomass furnace body, and a transmission rod is rotatably connected inside the second limiting base.

[0013] Preferably, one end of the transmission rod is fixedly connected to a flow fan blade, and the other end of the transmission rod is fixedly connected to a second bevel gear through one side of the biomass furnace body.

[0014] Preferably, a first limiting base is fixedly connected to the outside of the biomass furnace body, and a linkage rod is rotatably connected inside the first limiting base. A first bevel gear is fixedly connected to the bottom of the linkage rod, and the bottom of the first bevel gear meshes with the outside of a second bevel gear.

[0015] Preferably, a second pulley is fixedly connected to the top of the linkage rod, and a belt body is externally connected to the second pulley through the external transmission of the first pulley.

[0016] Preferably, a nozzle is installed on one side of the biomass furnace body, one end of the nozzle is connected to a carbon powder tube, and one end of the carbon powder tube is connected to a connector.

[0017] By adopting the above technical solution, the kinetic energy of flue gas is fully utilized, the waste temperature of flue gas is recycled, the alkali metal coking deposits are broken up, the alkali metal coking deposits are reduced, the impact of coking on the boiler heat exchange efficiency is reduced, and the problem of inconvenient cleaning of alkali metal coking adhering to the outside of the heat exchange tubes is solved.

[0018] This invention provides a biomass oxygen-enriched circulating combustion anti-coking heat exchange device. It has the following beneficial effects: 1. This invention, by setting up a heat exchange device body and setting up a fan roller to drive the overall rotation of the disturbance fan blades, and setting up an externally connected heat exchange tube, optimizes the heat exchange tube structure and the circulating flue gas disturbance design, suppresses alkali metal coking and deposition from the flow field and structural levels, stabilizes the boiler heat exchange efficiency, and thus reduces the coking of flue gas on the outside of the heat exchange tube. This solves the problem that the heat exchange device body is affected by flue gas, resulting in alkali metal coking and deposition, which affects the boiler heat exchange efficiency.

[0019] 2. This invention sets up a decoking body and a decoking hammer, and utilizes a spring structure and a hollow rod so that the rotation of the disturbance fan blades causes the decoking hammer to slightly impact the heat exchange tube, causing the alkali metal coke attached to the heat exchange tube to break and fall off, reducing the adhesion of alkali metal coke to the outside of the heat exchange tube, and solving the problem of inconvenient cleaning of alkali metal coke attached to the outside of the heat exchange tube.

[0020] 3. By setting up a flow fan blade, the flue gas flows along the internal cavity of the biomass furnace, driving the flow fan blade and transmission rod to rotate as a whole. This causes the second bevel gear to drive the linkage rod and the second pulley to rotate as a whole. The main body of the belt drives the fan blade roller to rotate, thereby utilizing the kinetic energy of the flue gas inside the biomass furnace and solving the problem of insufficient utilization of the fluid kinetic energy of the flue gas inside the biomass furnace, which leads to energy waste. Attached Figure Description

[0021] Figure 1 This is an overall perspective view of the present invention; Figure 2 This is a rear view of the present invention; Figure 3 This is a cross-sectional view of the biomass furnace body of the present invention; Figure 4 This is a cross-sectional view of the main body of the heat exchange device of the present invention; Figure 5 This is a schematic diagram of the fan blade roller of the present invention; Figure 6 This is a schematic diagram of the descaling body of the present invention; Figure 7 This is an enlarged view of point A in the present invention; Figure 8 This is an enlarged view of section B of the present invention; Figure 9 This is an enlarged view of point C in the present invention.

[0022] The components include: 1. Biomass furnace body; 2. Nozzle; 3. Carbon powder pipe; 4. Connector; 5. Filter tower; 6. Return pipe; 7. Heat exchanger body; 8. Connecting bolt; 9. Liquid pipe; 10. Connecting pipe; 11. Furnace body plate; 12. Heat exchanger tube; 13. First pulley; 14. Fan roller; 15. Disturbing fan blade; 16. Decoking body; 17. Bow-shaped block; 18. Sliding block; 19. Fixing block; 20. First limiting base; 21. Linkage rod; 22. Second pulley; 23. Belt body; 24. First bevel gear; 25. Second bevel gear; 26. Second limiting base; 27. Transmission rod; 28. Flow fan blade; 29. ​​Internal rod; 30. Tension spring; 31. Pull plate; 32. Hollow rod; 33. Inner sliding groove; 34. Decoking hammer. Detailed Implementation

[0023] 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.

[0024] Please see the appendix Figure 1 -Appendix Figure 9 This invention provides a biomass oxygen-enriched circulating combustion anti-coking heat exchange device, comprising a heat exchange device body 7, a first pulley 13 rotatably connected to the top of the heat exchange device body 7, a fan roller 14 fixedly connected to the bottom of the first pulley 13 through the top of the heat exchange device body 7, a disturbance fan 15 fixedly connected to the outside of the fan roller 14, a heat exchange tube 12 fixedly connected inside the heat exchange device body 7, a liquid pipe 9 connected to the input end of the heat exchange tube 12, a biomass furnace body 1 connected to one side of the heat exchange device body 7, a connecting bolt 8 threadedly connected to one side of the biomass furnace body 1 through the outside of the heat exchange device body 7, a furnace plate 11 fixedly connected inside the biomass furnace body 1, a connecting pipe 10 connected to the outside of the heat exchange device body 7, a filter tower 5 connected to one end of the connecting pipe 10, a return pipe 6 connected to the output end of the filter tower 5, and one end of the return pipe 6 connected to one side of the biomass furnace body 1.

[0025] Specifically, after the fuel inside the biomass furnace body 1 is consumed, the hot flue gas will enter the interior of the heat exchange device body 7 along the furnace plate 11. At the same time, the heat exchange tube 12 is connected to the heat transport medium through the liquid pipe 9, so that the heat transport medium flows into the interior of the heat exchange tube 12. Meanwhile, the hot flue gas will exchange heat through the metal heat exchange tube 12. Then, the flue gas flows into the interior of the filter tower 5 for flue gas filtration. Finally, the flue gas with residual heat is reinjected into the interior of the biomass furnace body 1 through the return pipe 6 for repeated heating. The fan roller 14 can rotate inside the heat exchanger body 7, and cause the turbulent fan 15 to drive the flue gas flow upward, so that the flue gas is in a turbulent state, reducing the contact between the hot-melted fuel portion and the heat exchange tube 12, suppressing alkali metal coking deposition from the flow field and structural level, and reducing the coking of flue gas outside the heat exchange tube 12.

[0026] Please see the appendix Figure 6 and attached Figure 9 The bottom of the fan roller 14 is fixedly connected to a desiccant body 16, the outside of the desiccant body 16 is fixedly connected to an arc-shaped block 17, the inside of the arc-shaped block 17 is slidably connected to a hollow rod 32, and the outside of the hollow rod 32 is fixedly connected to a pull plate 31. The hollow rod 32 has an inner groove 33 inside, and a sliding block 18 is slidably connected to the outside of the hollow rod 32. The two ends of the hollow rod 32 are fixedly connected to the tension springs 30 through the bow-shaped block 17 and the sliding block 18. The bow-shaped block 17 and the sliding block 18 are both fixedly connected to the interior rods 29. The exterior of the interior rods 29 are slidably connected to the interior of the hollow rod 32. A fixing block 19 is fixedly connected to one side of the sliding block 18, and a decoking hammer 34 is fixedly connected inside the fixing block 19.

[0027] Specifically, during the rotation of the fan roller 14, the decoking body 16 will rotate as a whole, and the decoking hammer 34 will be affected by centrifugal force, causing the sliding block 18 to slide as a whole, so that the hollow rod 32 slides outside the built-in rod 29, while pulling the tension spring 30 into a stretched state. During this process, the decoking hammer 34 will intermittently and slightly hammer the coking part attached to the outer wall of the heat exchange tube 12, causing the coking part on the outer wall of the heat exchange tube 12 to break and peel off.

[0028] Please see the appendix Figure 1 , Figure 7 and attached Figure 8 The biomass furnace body 1 is fixedly connected to a second limiting base 26, and the second limiting base 26 is rotatably connected to a transmission rod 27. One end of the transmission rod 27 is fixedly connected to a flow fan blade 28, and the other end of the transmission rod 27 is fixedly connected to a second bevel gear 25 through one side of the biomass furnace body 1. A first limiting base 20 is fixedly connected to the outside of the biomass furnace body 1. A linkage rod 21 is rotatably connected inside the first limiting base 20. A first bevel gear 24 is fixedly connected to the bottom of the linkage rod 21. The bottom of the first bevel gear 24 meshes with the outside of the second bevel gear 25. The top of the linkage rod 21 is fixedly connected to the second pulley 22, and the outside of the second pulley 22 is connected to the belt body 23 through the outside of the first pulley 13; A nozzle 2 is installed on one side of the biomass furnace body 1. One end of the nozzle 2 is connected to a carbon powder tube 3, and one end of the carbon powder tube 3 is connected to a connector 4.

[0029] Specifically, the connector 4 connects to the carbon powder conveying structure, so that the carbon powder enters the nozzle 2 along the carbon powder pipe 3 and rises, thereby causing the carbon powder fuel to burn inside the biomass furnace body 1. During the combustion process, the furnace body plate 11 directly blocks the flame, and the flue gas flows along one side of the furnace body plate 11. During the flow of flue gas, when the flue gas passes through the connection between the biomass furnace body 1 and the heat exchange device body 7, the kinetic energy of the flue gas flow will cause the flow fan blade 28 to rotate as a whole. In this process, the second limiting base 26 plays the role of assisting the rotation of the transmission rod 27 and the second bevel gear 25. At the same time, the first bevel gear 24 drives the linkage rod 21 to rotate, and cooperates with the first pulley 13 and the second pulley 22 with toothed structure. The first pulley 13 drives the fan blade roller 14 to rotate.

[0030] Workflow: After the nozzle 2 sprays carbon powder into the biomass furnace body 1, it is burned. Combined with an oxygen-enriched, nitrogen-free combustion method, it achieves low nitrogen emissions and high-concentration carbon dioxide production. The generated flue gas flows upward inside the biomass furnace body 1, causing the flow fan 28 to rotate. At this time, the transmission rod 27 rotates inside the second limiting base 26, driving the second bevel gear 25 to rotate. The linkage rod 21 is limited to rotate inside the first limiting base 20, and the first bevel gear 24 meshes with the second bevel gear 25. This rotation of the flow fan 28 causes the linkage rod 21 and the second pulley 22 to rotate. Because the first pulley 13 and the second pulley 22 have toothed grooves, the belt body 23 uses these grooves to mesh with the outside of the first pulley 13 and the second pulley 22. Therefore, the rotation of the second pulley 22 causes the belt body to rotate. After the body 23 performs transmission motion, it drives the first pulley 13 and the fan roller 14 to rotate. After the turbulent fan 15 rotates, an upward airflow is generated inside the heat exchanger body 7, causing the flue gas to be in a turbulent state inside the heat exchanger body 7. The heat will be exchanged with the heat exchange medium inside the metal tube wall of the heat exchange tube 12. Then the flue gas will enter the filter tower 5 along the connecting pipe 10 for filtration. The residual heat will then flow back into the biomass furnace body 1 for heating via the return pipe 6. During the rotation of the fan roller 14, the decoking body 16 will rotate as a whole. The decoking hammer 34 is affected by centrifugal force, which drives the sliding block 18 to slide outside the hollow rod 32. The tension spring 30 will be stretched, which will reset the decoking hammer 34. The built-in rod 29 will play an auxiliary limiting role. The decoking hammer 34 will break the coke after intermittently hammering the outside of the heat exchange tube 12.

[0031] 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 anti-coking heat exchange device, comprising a heat exchange device body (7), characterized in that, The top of the heat exchanger body (7) is rotatably connected to a first pulley (13). The bottom of the first pulley (13) passes through the top of the heat exchanger body (7) and is fixedly connected to a fan roller (14). The outside of the fan roller (14) is fixedly connected to a disturbance fan blade (15). The inside of the heat exchanger body (7) is fixedly connected to a heat exchange tube (12). The input end of the heat exchange tube (12) is connected to a liquid pipe (9). One side of the heat exchanger body (7) is connected to a biomass furnace body (1). One side of the biomass furnace body (1) is connected to a connecting bolt (8) through the external thread of the heat exchanger body (7). The inside of the biomass furnace body (1) is fixedly connected to a furnace plate (11). The outside of the heat exchanger body (7) is connected to a connecting pipe (10). One end of the connecting pipe (10) is connected to a filter tower (5). The output end of the filter tower (5) is connected to a return pipe (6). One end of the return pipe (6) is connected to one side of the biomass furnace body (1).

2. The biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 1, characterized in that, The bottom of the fan blade roller (14) is fixedly connected to a desiccant body (16), the outside of the desiccant body (16) is fixedly connected to an arc-shaped block (17), the inside of the arc-shaped block (17) is slidably connected to a hollow rod (32), and the outside of the hollow rod (32) is fixedly connected to a pull plate (31).

3. The biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 2, characterized in that, The hollow rod (32) has an inner groove (33) inside, and a sliding block (18) is slidably connected to the outside of the hollow rod (32).

4. The biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 3, characterized in that, The two ends of the hollow rod (32) are fixedly connected to tension springs (30) through the inside of the bow-shaped block (17) and the sliding block (18). The inside of the bow-shaped block (17) and the sliding block (18) are both fixedly connected to built-in rods (29). The outside of the built-in rods (29) are slidably connected to the inside of the hollow rod (32).

5. The biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 3, characterized in that, A fixing block (19) is fixedly connected to one side of the sliding block (18), and a decoking hammer (34) is fixedly connected inside the fixing block (19).

6. The biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 1, characterized in that, The biomass furnace body (1) is fixedly connected to a second limiting base (26), and a transmission rod (27) is rotatably connected to the inside of the second limiting base (26).

7. The biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 6, characterized in that, One end of the transmission rod (27) is fixedly connected to a flow fan blade (28), and the other end of the transmission rod (27) is fixedly connected to a second bevel gear (25) through one side of the biomass furnace body (1).

8. The biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 7, characterized in that, The biomass furnace body (1) is fixedly connected to a first limiting base (20) on the outside. The first limiting base (20) is rotatably connected to a linkage rod (21) inside. The bottom of the linkage rod (21) is fixedly connected to a first bevel gear (24). The bottom of the first bevel gear (24) meshes with the outside of a second bevel gear (25).

9. A biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 8, characterized in that, The top of the linkage rod (21) is fixedly connected to a second pulley (22), and the outside of the second pulley (22) is connected to a belt body (23) through the outside of the first pulley (13).

10. A biomass oxygen-enriched circulating combustion anti-coking heat exchange device according to claim 1, characterized in that, A nozzle (2) is installed on one side of the biomass furnace body (1), one end of the nozzle (2) is connected to a carbon powder tube (3), and one end of the carbon powder tube (3) is connected to a connector (4).

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