Exhaust gas waste heat recovery and purification integrated device

Abstract

The utility model discloses a kind of waste gas waste heat recovery and purification integrated device, including integrated tank, its inside is sequentially provided with air inlet pipe, spiral turbulent heat exchange mechanism, radial purification reaction mechanism, solution bucket, spraying mechanism and suction exhaust pipe from bottom to top. Spiral turbulent heat exchange mechanism includes center heat exchange column, grid ring, spiral heat exchange sheet, spiral water pipe and net cylinder, waste gas rotates ascending along spiral channel, realizes efficient heat exchange and primary dust removal. Radial purification reaction mechanism includes gas collection shell and annular radial purification block, its radial honeycomb hole structure effectively reduces airflow resistance, improves purification efficiency. Spraying mechanism can spray cooling water or liquid medicine, further purify waste gas and adjust temperature. The device compact structure, integrated waste heat recovery and multistage purification function, applicable to power plant and other waste gas treatment scene, with the advantages of small floor area, low energy consumption, good purification effect.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to an integrated device for waste gas waste heat recovery and purification. Background Technology

[0002] In thermal power plants and gas-fired combined cycle power plants, the exhaust gas from boilers or gas turbines carries a large amount of medium- and low-temperature waste heat and contains pollutants such as dust, sulfur oxides, and nitrogen oxides. Currently, the mainstream treatment method is to arrange waste heat recovery systems (such as economizers and low-pressure economizers) and pollutant purification systems (such as dust collectors, desulfurization towers, and denitrification devices) in series as independent units. This traditional approach has the following inherent drawbacks: First, the entire system is huge, occupies a lot of space, and each functional unit needs to be installed independently, resulting in complex piping connections and high costs. Secondly, as the exhaust gas flows through connecting pipes and various equipment, there are significant heat dissipation and pressure losses. To overcome system resistance, the energy consumption of the induced draft fan also increases. Utility Model Content

[0003] The purpose of this invention is to provide an integrated device for waste heat recovery and purification of exhaust gas, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an integrated device for waste heat recovery and purification of waste gas, comprising an integrated tank, wherein the interior of the integrated tank is provided with an air inlet pipe, a spiral turbulence heat exchange mechanism, a radial purification reaction mechanism, a solution tank, a spraying mechanism and a suction exhaust pipe from bottom to top; The spiral turbulence heat exchange mechanism includes a central heat exchange column, a baffle ring, spiral heat exchange plates, a spiral water pipe, and a mesh cylinder. The central heat exchange column is fixedly connected to the inner bottom of the integrated tank. The spiral water pipe is fixedly embedded in the outer surface of the central heat exchange column. The spiral heat exchange plates are fixedly connected to the outer surface of the spiral water pipe. The baffle ring is fixedly connected to the middle inner wall of the integrated tank, and the installation height of the baffle ring is the same as the top height of the central heat exchange column. The mesh cylinder is fixedly connected between the baffle ring and the inner bottom of the integrated tank, and the mesh cylinder abuts against the outer side of the spiral heat exchange plates. The upper end of the air inlet pipe corresponds to the spiral heat exchange plates. The radial purification reaction mechanism includes a gas collection shell and an annular radial purification block. The gas collection shell is fixedly connected to the upper surface of the baffle ring, and the annular radial purification block is fixedly installed in the inner cavity of the gas collection shell. An air inlet is opened at the lower end of the gas collection shell, which is connected to the input end of the annular radial purification block. Multiple exhaust holes are opened on the inner side of the gas collection shell, which are connected to the output end of the annular radial purification block. The spraying mechanism is located directly above the center of the gas collection shell.

[0005] Preferably, the lower inlet of the spiral water pipe extends to the outer side of the bottom of the integrated tank, and the upper outlet of the spiral water pipe extends to the outer side of the middle of the integrated tank. Preferably, the surface of the annular radial purification block is provided with a plurality of radial honeycomb holes, and the inner wall of the radial honeycomb holes is made of a porous adsorption material.

[0006] Preferably, the outer surface of the integrated tank is provided with a drain pipe extending to the bottom of the solution tank.

[0007] Preferably, a conical guide ring is fixedly connected to the inner wall of the gas collecting shell, and the outer surface of the conical guide ring corresponds to a plurality of exhaust holes.

[0008] Preferably, the spraying mechanism includes a liquid supply pipeline, multiple nozzles and a cross bracket. The cross bracket is fixedly connected to the inner wall of the gas collecting shell, the multiple nozzles are fixedly connected to the lower surface of the cross bracket, and the multiple nozzles are all fixedly connected to the liquid supply pipeline. The input end of the liquid supply pipeline extends through to the outside of the integrated tank.

[0009] Preferably, the inner bottom of the integrated tank is provided with a dust removal mechanism, which includes a rotating gear ring, a servo motor, a drive gear, a scraper, and a dust baffle. The rotating gear ring is rotatably connected to the inner wall of the integrated tank, the servo motor is fixedly connected to the inner wall of the integrated tank, the drive gear is fixedly connected to the rotating end of the servo motor, and the drive gear meshes with the rotating gear ring. The scraper is fixedly connected to the lower surface of the rotating gear ring and abuts against the inner bottom of the integrated tank. The dust baffle is fixedly connected to the lower surface of the baffle ring, and the lower end of the dust baffle extends to the inner side of the rotating gear ring.

[0010] Beneficial effects This utility model provides an integrated device for waste gas heat recovery and purification, which has the following beneficial effects: 1. This integrated waste gas heat recovery and purification device can enhance air-side turbulence, improve heat exchange efficiency, and reduce heat loss through a spiral turbulence heat exchange mechanism, while also achieving primary inertial dust removal.

[0011] 2. This integrated waste heat recovery and purification device for exhaust gas, by setting up a radial purification reaction mechanism and adopting a radial honeycomb hole design, shortens the airflow path and reduces the pressure drop, effectively reducing system resistance and lowering the energy consumption of the fan in the suction and exhaust pipe.

[0012] 3. This integrated waste gas heat recovery and purification device, through the setting of a spray mechanism, can precisely control the spray volume, realize waste gas temperature regulation and deep purification, and adapt to various working conditions.

[0013] 4. This integrated waste heat recovery and purification device features a highly integrated overall structure, reducing the footprint and piping connections, simplifying the system layout, and lowering construction and operating costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an integrated waste gas heat recovery and purification device proposed in this utility model. Figure 2 This is a cross-sectional structural diagram of an integrated waste gas heat recovery and purification device proposed in this utility model; Figure 3 This is a cross-sectional view of the radial purification reaction mechanism of an integrated waste gas waste heat recovery and purification device proposed in this utility model. Figure 4 This is a three-dimensional structural diagram of an annular radial purification block of an integrated waste gas waste heat recovery and purification device proposed in this utility model. Figure 5 This utility model proposes an integrated device for waste heat recovery and purification of waste gas. Figure 2 A schematic diagram of the enlarged structure of A.

[0015] In the diagram: 1. Integrated tank; 2. Air inlet pipe; 3. Spiral turbulence heat exchange mechanism; 4. Radial purification reaction mechanism; 5. Solution tank; 6. Spraying mechanism; 7. Suction and exhaust pipe; 8. Central heat exchange column; 9. Baffle ring; 10. Spiral heat exchange plate; 11. Spiral water pipe; 12. Mesh cylinder; 13. Gas collection shell; 14. Annular radial purification block; 15. Air inlet; 16. Exhaust port; 17. Water inlet; 18. Water outlet; 19. Radial honeycomb holes; 20. Sewage pipe; 21. Conical guide ring; 22. Liquid supply pipeline; 23. Spray head; 24. Cross bracket; 25. Rotating gear ring; 26. Servo motor; 27. Drive gear; 28. Scraper; 29. ​​Dust baffle. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0019] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] Please see Figure 1-5 This utility model provides a technical solution: an integrated device for waste heat recovery and purification of waste gas, including an integrated tank 1. The integrated tank 1 is provided with an air inlet pipe 2, a spiral turbulence heat exchange mechanism 3, a radial purification reaction mechanism 4, a solution tank 5, a spray mechanism 6 and a suction exhaust pipe 7 from bottom to top. The suction exhaust pipe 7 is provided with an induced draft fan inside.

[0021] The spiral turbulence heat exchange mechanism 3 includes a central heat exchange column 8, a baffle ring 9, a spiral heat exchange plate 10, a spiral water pipe 11, and a mesh cylinder 12. The central heat exchange column 8 is fixedly connected to the inner bottom of the integrated tank 1. The spiral water pipe 11 is fixedly embedded in the outer surface of the central heat exchange column 8. The spiral heat exchange plate 10 is fixedly connected to the outer surface of the spiral water pipe 11. The baffle ring 9 is fixedly connected to the middle inner wall of the integrated tank 1, and the installation height of the baffle ring 9 is the same as the top height of the central heat exchange column 8. The mesh cylinder 12 is fixedly connected between the baffle ring 9 and the inner bottom of the integrated tank 1, and the mesh cylinder 12 abuts against the outer side of the spiral heat exchange plate 10. The upper end of the air inlet pipe 2 corresponds to the spiral heat exchange plate 10. The radial purification reaction mechanism 4 includes a gas collecting shell 13 and an annular radial purification block 14. The gas collecting shell 13 is fixedly connected to the upper surface of the baffle ring 9. The annular radial purification block 14 is fixedly installed in the inner cavity of the gas collecting shell 13. An air inlet 15 is opened at the lower end of the gas collecting shell 13 and communicates with the input end of the annular radial purification block 14. Multiple exhaust holes 16 are opened on the inner side of the gas collecting shell 13 and communicate with the output end of the annular radial purification block 14. The solution tank 5 is fixedly connected to the spraying mechanism 6, which is located directly above the center of the gas collecting shell 13.

[0022] The air inlet pipe 2, spiral turbulence heat exchange mechanism 3, radial purification reaction mechanism 4, solution tank 5, spray mechanism 6, and suction and exhaust pipe 7 are all located inside the integrated tank 1. The overall structure is compact, which greatly reduces the floor space and pipe connections.

[0023] The lower end inlet 17 of the spiral water pipe 11 extends to the outer side of the bottom of the integrated tank 1, and the upper end outlet 18 of the spiral water pipe 11 extends to the outer side of the middle part of the integrated tank 1.

[0024] By pumping cold water into the system through inlet 17, the cold water rises along the spiral water pipe 11 and is finally discharged from outlet 18. A spiral channel is formed by setting up a central heat exchange column 8, spiral heat exchange plates 10, and a mesh cylinder 12. After the exhaust gas enters the channel through the inlet pipe 2, it is limited by the spiral heat exchange plates 10, which forces the exhaust gas to rotate upward along the spiral channel from the bottom of the integrated tank 1. The spiral channel greatly enhances the gas-side turbulence. The spiral heat exchange plates 10 and the central heat exchange column 8 absorb the heat from the exhaust gas, which heats the spiral water pipe 11, thereby heating the water inside the spiral water pipe 11. Finally, the hot water is discharged from outlet 18. The spiral heat exchange structure formed by the central heat exchange column 8, spiral heat exchange plates 10, and spiral water pipe 11 has a significantly higher heat transfer coefficient than traditional straight pipes or serpentine tube bundles, thus effectively reducing heat loss.

[0025] At the same time, the exhaust gas rotates and flows upward in the spiral channel. The centrifugal force of rotation can help to throw some of the larger dust particles in the exhaust gas toward the outer mesh cylinder 12. The larger dust particles will pass through the mesh holes of the mesh cylinder 12 and fall into the inner bottom of the integrated tank 1, thereby achieving primary inertial dust removal.

[0026] The annular radial purification block 14 has several radial honeycomb holes 19 on its surface. The inner walls of the radial honeycomb holes 19 are made of porous adsorption material. Compared with traditional bulk catalysts, this structure has an extremely high specific surface area and an extremely low pressure drop. It can also be used as an adsorbent carrier (such as supported activated carbon for mercury removal) or directly as a carrier for SCR denitrification catalysts and desulfurization catalysts. The exhaust gas has sufficient contact with the adsorption medium on the inner wall of the radial honeycomb holes 19, resulting in high reaction efficiency and thus achieving further purification of the exhaust gas.

[0027] Furthermore, the radial honeycomb holes 19 of the annular radial purification block 14 have a shorter airflow path and a larger flow cross-sectional area compared with the traditional axial flow, thus significantly reducing system resistance and limiting the energy consumption of the induced draft fan in the suction and exhaust pipe 7.

[0028] The outer surface of the integrated tank 1 is provided with a drain pipe 20 extending to the bottom of the solution tank 5. By setting the drain pipe 20 and connecting it to an external pump, the sewage in the solution tank 5 can be discharged.

[0029] A conical guide ring 21 is fixedly connected to the inner wall of the gas collection shell 13. The outer surface of the conical guide ring 21 corresponds to multiple exhaust holes 16. By setting the conical guide ring 21, the solution sprayed by the spraying mechanism 6 can be guided, so that the solution can flow accurately into the solution tank 5.

[0030] The spraying mechanism 6 includes a liquid supply pipe 22, multiple nozzles 23, and a cross bracket 24. The nozzles 23 are specifically atomizing nozzles. The cross bracket 24 is fixedly connected to the inner wall of the gas collection shell 13. The multiple nozzles 23 are fixedly connected to the lower surface of the cross bracket 24, and all the nozzles 23 are fixedly connected to the liquid supply pipe 22. The input end of the liquid supply pipe 22 extends to the outside of the integrated tank 1. By setting up the spraying mechanism 6, the liquid supply pipe 22 can provide solution to the multiple nozzles 23. The solution can be cooling water or a corresponding chemical solution (such as limestone slurry). By spraying through the multiple nozzles 23, the gas discharged from the exhaust port 16 can be further purified, washed, and cooled. The solution sprayed by the nozzles 23 can be collected by setting up a solution tank 5. The spray volume of the spraying mechanism 6 is easy to control, and the exhaust gas temperature can be precisely adjusted.

[0031] A dust removal mechanism is provided at the bottom of the integrated tank 1. The dust removal mechanism includes a rotating gear ring 25, a servo motor 26, a drive gear 27, a scraper 28, and a dust baffle 29. The rotating gear ring 25 is rotatably connected to the inner wall of the integrated tank 1. The servo motor 26 is fixedly connected to the inner wall of the integrated tank 1. The drive gear 27 is fixedly connected to the rotating end of the servo motor 26, and the drive gear 27 meshes with the rotating gear ring 25. The scraper 28 is fixedly connected to the lower surface of the rotating gear ring 25 and abuts against the bottom of the integrated tank 1. The dust baffle 29 is fixedly connected to the lower surface of the baffle ring 9, and the lower end of the dust baffle 29 extends into the rotating gear ring 25. On the side, by setting up a dust removal mechanism, the dust baffle 29 can limit the larger dust particles thrown out under the action of centrifugal force, thereby partially avoiding dust contamination of the rotating gear ring 25. The servo motor 26 can drive the drive gear 27 to rotate. The drive gear 27 and the rotating gear ring 25 mesh and drive the scraper 28 to rotate. In practical applications, a through hole needs to be opened in the inner bottom of the integrated tank 1. The through hole needs to be sealed with a plug. When it is necessary to clean the dust in the inner bottom of the integrated tank 1, the dust can be driven out through the through hole by the rotation of the scraper 28, thereby realizing the automatic cleaning of the integrated tank 1 itself.

[0032] Working Principle: During operation, exhaust gas enters the spiral turbulence heat exchange mechanism 3 through the inlet pipe 2, rotates and rises along the spiral channel, and exchanges heat with the spiral heat exchange plates 10 and the central heat exchange column 8 to achieve waste heat recovery. Simultaneously, under centrifugal force, some dust is thrown out and settles at the bottom of the integrated tank 1. The exhaust gas then enters the radial purification reaction mechanism 4, where it undergoes adsorption or catalytic reaction through the radial honeycomb holes 19 of the annular radial purification block 14 to remove pollutants. The purified gas is then sprayed and cooled by the spray mechanism 6 for further purification, and finally discharged through the suction exhaust pipe 7. The spray liquid is collected in the solution tank 5, and the dust at the bottom of the integrated tank 1 is periodically cleaned by the dust removal mechanism, achieving continuous and efficient exhaust gas treatment and waste heat utilization.

[0033] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated device for waste heat recovery and purification of exhaust gas, comprising an integrated tank (1), characterized in that: The interior of the integrated tank (1) is provided with an air inlet pipe (2), a spiral turbulence heat exchange mechanism (3), a radial purification reaction mechanism (4), a solution tank (5), a spraying mechanism (6), and a suction and exhaust pipe (7) from bottom to top. The spiral turbulence heat exchange mechanism (3) includes a central heat exchange column (8), a baffle ring (9), a spiral heat exchange plate (10), a spiral water pipe (11), and a mesh cylinder (12). The central heat exchange column (8) is fixedly connected to the inner bottom of the integrated tank (1). The spiral water pipe (11) is fixedly embedded in the outer surface of the central heat exchange column (8). The spiral heat exchange plate (10) is fixedly connected to the outer surface of the spiral water pipe (11). The baffle ring (9) is fixedly connected to the inner wall of the middle part of the integrated tank (1), and the installation height of the baffle ring (9) is the same as the top height of the central heat exchange column (8). The mesh cylinder (12) is fixedly connected between the baffle ring (9) and the inner bottom of the integrated tank (1), and the mesh cylinder (12) abuts against the outer side of the spiral heat exchange plate (10). The upper end of the air inlet pipe (2) corresponds to the spiral heat exchange plate (10). The radial purification reaction mechanism (4) includes a gas collection shell (13) and an annular radial purification block (14). The gas collection shell (13) is fixedly connected to the upper surface of the baffle ring (9). The annular radial purification block (14) is fixedly installed in the inner cavity of the gas collection shell (13). An air inlet (15) is opened at the lower end of the gas collection shell (13) and communicates with the input end of the annular radial purification block (14). Multiple exhaust holes (16) are opened on the inner side of the gas collection shell (13) and communicate with the output end of the annular radial purification block (14). The spraying mechanism (6) is located directly above the center of the gas collection shell (13).

2. The integrated waste heat recovery and purification device for exhaust gas according to claim 1, characterized in that: The lower end inlet (17) of the spiral water pipe (11) extends to the outer side of the bottom of the integrated tank (1), and the upper end outlet (18) of the spiral water pipe (11) extends to the outer side of the middle part of the integrated tank (1).

3. The integrated waste heat recovery and purification device for exhaust gas according to claim 1, characterized in that: The surface of the annular radial purification block (14) is provided with a number of radial honeycomb holes (19), and the inner wall of the radial honeycomb holes (19) is made of porous adsorption material.

4. The integrated waste heat recovery and purification device for exhaust gas according to claim 1, characterized in that: The outer surface of the integrated tank (1) is provided with a drain pipe (20) extending to the bottom of the solution tank (5).

5. The integrated waste heat recovery and purification device for exhaust gas according to claim 1, characterized in that: The inner wall of the gas collection shell (13) is fixedly connected to a conical guide ring (21), and the outer surface of the conical guide ring (21) corresponds to a plurality of exhaust holes (16).

6. The integrated waste heat recovery and purification device for exhaust gas according to claim 5, characterized in that: The spraying mechanism (6) includes a liquid supply pipeline (22), multiple nozzles (23) and a cross bracket (24). The cross bracket (24) is fixedly connected to the inner wall of the gas collection shell (13). The multiple nozzles (23) are fixedly connected to the lower surface of the cross bracket (24), and the multiple nozzles (23) are all fixedly connected to the liquid supply pipeline (22). The input end of the liquid supply pipeline (22) extends through to the outside of the integrated tank (1).

7. The integrated waste heat recovery and purification device for exhaust gas according to claim 1, characterized in that: The inner bottom of the integrated tank (1) is provided with a dust removal mechanism, which includes a rotating gear ring (25), a servo motor (26), a drive gear (27), a scraper (28), and a dust baffle (29). The rotating gear ring (25) is rotatably connected to the inner wall of the integrated tank (1), the servo motor (26) is fixedly connected to the inner wall of the integrated tank (1), the drive gear (27) is fixedly connected to the rotating end of the servo motor (26), and the drive gear (27) meshes with the rotating gear ring (25). The scraper (28) is fixedly connected to the lower surface of the rotating gear ring (25) and abuts against the inner bottom of the integrated tank (1). The dust baffle (29) is fixedly connected to the lower surface of the baffle ring (9), and the lower end of the dust baffle (29) extends to the inner side of the rotating gear ring (25).

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