Tail gas desulfurization and denitrification waste heat recovery device

Abstract

The utility model discloses a tail gas desulfurization and denitrification waste heat recovery device which comprises a box body, a gas inlet and a gas outlet are formed in the box body, the gas inlet and the gas outlet are oppositely located in the side face of the box body, a heat exchange assembly is arranged in the box body, and the heat exchange assembly comprises a first liquid separation cavity, a second liquid separation cavity and a plurality of heat exchange pipes. One end of the heat exchange pipe is communicated with the first liquid separation cavity, the other end of the heat exchange pipe is communicated with the second liquid separation cavity, a liquid outlet pipe is arranged on the first liquid separation cavity, a liquid inlet pipe is arranged on the second liquid separation cavity, the liquid outlet pipe and the liquid inlet pipe penetrate through the box body and are rotationally connected with the box body, and a plurality of fins are arranged on the heat exchange pipe. The fins are parallel to the communicating direction of the air inlet and the air outlet, a driving mechanism is arranged outside the box body, and the driving mechanism drives the heat exchange assembly to rotate. According to the utility model, the efficient recovery of waste heat is realized, dust among the fins can be centrifugally and quickly cleaned, and the long-term normal operation of equipment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field, especially a tail gas desulfurization and denitrification waste heat recovery device. BACKGROUND

[0002] The tail gas discharged by the kiln of the power plant contains a large amount of acidic gases such as sulfur dioxide and nitrogen oxide, and must be discharged into the atmosphere after desulfurization and denitrification. The temperature of the desulfurization and denitrification catalytic reaction treatment is 280-420℃, resulting in very high temperature of the discharged tail gas. Direct discharge seriously wastes heat energy, and waste heat recovery treatment must be carried out.

[0003] Patent 201921762511.1 discloses a staggered finned tube waste heat recovery device. By providing multiple fins on multiple waterway pipes, the flue gas is in full contact with the finned tube assembly, achieving efficient heat transfer and waste heat recovery. In order to improve the heat transfer efficiency, the fins are usually closely arranged. Since the recovery device does not have the function of cleaning dust, a large amount of dust and fine materials in the tail gas will adhere to the fins, hindering heat transfer and airflow movement, and long-term operation will greatly reduce the waste heat recovery efficiency. SUMMARY

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a tail gas desulfurization and denitrification waste heat recovery device to solve the problem of dust adhering to the fins and hindering heat transfer and affecting waste heat recovery during long-term operation.

[0005] The utility model discloses a tail gas desulfurization and denitrification waste heat recovery device, which comprises a box body, an air inlet and an air outlet are arranged on the box body, the air inlet and the air outlet are located on the side of the box body, a heat exchange assembly is arranged in the box body, the heat exchange assembly comprises a first liquid separation chamber, a second liquid separation chamber and a plurality of heat exchange pipes, one end of the heat exchange pipe is communicated with the first liquid separation chamber, the other end of the heat exchange pipe is respectively communicated with the second liquid separation chamber, a liquid outlet pipe is arranged on the first liquid separation chamber, a liquid inlet pipe is arranged on the second liquid separation chamber, the liquid outlet pipe and the liquid inlet pipe respectively pass through the box body, and the two are respectively rotatably connected with the box body, a plurality of fins are arranged on the heat exchange pipe, the fins are parallel to the direction of the air inlet and the air outlet, a driving mechanism is arranged outside the box body, and the driving mechanism drives the heat exchange assembly to rotate.

[0006] Further, the driving mechanism comprises a first gear, a second gear and a motor, the first gear is sleeved on the liquid outlet pipe, the motor is fixedly connected to the box body, the output end of the motor is fixedly connected to the second gear, and the first gear is meshingly connected with the second gear.

[0007] Further, the fins are annular structures, and the fins on two adjacent heat exchange pipes are partially overlapped to form a single-layer heat transfer surface, and the adjacent fins are arranged in parallel to form a plurality of single-layer heat transfer surfaces.

[0008] Further, the middle part of the first liquid separation cavity is provided with an opening, the liquid outlet pipe is a cylindrical structure with an annular liquid passage, the liquid outlet pipe is provided with a liquid delivery pipe and a sealing plate, the sealing plate is rotationally connected to the inner wall of the liquid outlet pipe, the bottom end of the liquid delivery pipe penetrates through the sealing plate and extends to between the heat exchange pipes, a plurality of liquid injection branch pipes are arranged on the liquid delivery pipe and respectively extend to between the fins, a cover is arranged on the liquid outlet pipe, the cover is rotationally and sealingly connected to the liquid outlet pipe, and a liquid outlet is arranged on the cover and communicates with the liquid passage in the liquid outlet pipe.

[0009] Further, a bearing seat is arranged between the second liquid separation cavity and the box body, the bearing seat is an annular structure, and the bearing seat comprises an upper ring, balls and a lower ring, the lower surface of the upper ring and the upper surface of the lower ring are provided with corresponding annular grooves, the balls are filled in the annular grooves, and the bottom of the second liquid separation cavity abuts against the upper ring.

[0010] The utility model has the advantages that the first liquid separation cavity, the heat exchange pipe with fins and the second liquid separation cavity form a heat exchange assembly, the motor drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the liquid outlet pipe to rotate, the liquid outlet pipe drives the heat exchange assembly to rotate as a whole, dust adhered between the fins is thrown out by centrifugal force, the problem of reduced waste heat recovery efficiency caused by dust adhered to the fins is avoided, and normal operation of the waste heat recovery device is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a sectional view structure schematic diagram of the utility model embodiment;

[0012] Figure 2 is Figure 1 the A point amplification schematic diagram of ;

[0013] Figure 3 is Figure 1 the B point amplification schematic diagram of ;

[0014] In the drawing, 1, the box body;2, the air inlet;3, the air outlet;4, the supporting leg;5, the first liquid separation cavity;6, the heat exchange pipe;7, the second liquid separation cavity;8, the liquid outlet pipe;9, the liquid inlet pipe;10, the fin;11, the first gear;12, the second gear;13, the motor;14, the opening;15, the sealing plate;16, the cover;17, the liquid outlet;18, the liquid delivery pipe;19, the liquid injection branch pipe;20, the bearing seat;21, the upper ring;22, the ball;23, the lower ring. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0017] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0018] As Figure 1As shown, a waste heat recovery device for flue gas desulfurization and denitrification includes a rectangular box 1. An air inlet 2 is opened on the left side of the box 1, and an air outlet 3 is opened on the right side of the box 1. The air inlet 2 and the air outlet 3 are horizontally opposite each other on the sides of the box 1. A heat exchange assembly is installed inside the box 1, and a drive mechanism is installed on the upper part of the box 1. The heat exchange assembly includes a first liquid distribution chamber 5, a second liquid distribution chamber 7, and multiple heat exchange tubes 6. The first liquid distribution chamber 5 and the second liquid distribution chamber 7 are both circular plate structures with internal cavities. A circular opening 14 is provided in the center of the first liquid distribution chamber 5. The heat exchange tubes 6 are evenly spaced and form an annular cylindrical structure, with the space formed in the center vertically corresponding to the opening 14. One end of the heat pipe 6 is connected to the first liquid distribution chamber 5, and the other end of the heat exchange pipe 6 is connected to the second liquid distribution chamber 7. An outlet pipe 8 is installed on the first liquid distribution chamber 5. The outlet pipe 8 is a double-walled sandwich cylindrical structure with an internal annular liquid passage. One end of the outlet pipe 8 is connected to the first liquid distribution chamber 5, and the other end of the outlet pipe 8 passes through the housing 1 and is rotatably sealed to the housing 1. A cover 16 is installed on the outlet pipe 8. The cover 16 is a circular structure. A groove is provided on the lower surface of the cover 16. The outlet pipe 8 is stuck in the groove. The cover 16 is rotatably sealed to the outlet pipe 8. An outlet 17 is opened on the cover 16. The outlet 17 is connected to the cavity of the double-walled sandwich inside the outlet pipe 8.

[0019] The drive mechanism includes a first gear 11, a second gear 12, and a motor 13. The first gear 11 is mounted on the liquid outlet pipe 8. The motor 13 is fixed to the housing 1 by a support frame structure. The output end of the motor 13 is fixedly connected to the rotating shaft of the second gear 12. The first gear 11 and the second gear 12 are meshed together.

[0020] like Figure 2 As shown, multiple fins 10 are installed on the heat exchange tube 6. The fins 10 are distributed on the heat exchange tube 6 from top to bottom. The fins 10 have a ring structure and are formed by stacking C-shaped fins end to end to form a ring. The left and right adjacent fins 10 are partially stacked to form a single-layer heat transfer surface. The upper and lower adjacent fins 10 are arranged in parallel to form multiple single-layer heat transfer surfaces. The fins 10 are arranged horizontally so that they are parallel to the left and right flow direction of the exhaust gas.

[0021] An infusion pipe 18 and a sealing plate 15 are installed inside the outlet pipe 8. The sealing plate 15 has a T-shaped cross-section and is fitted together with a circular annular plate welded to the middle of the inner wall of the outlet pipe 8. The sealing plate 15 is rotatably connected to the circular annular plate. The bottom end of the infusion pipe 18 passes through the sealing plate 15 and extends to the heat exchange pipes 6. Multiple spray branches 19 are provided on the infusion pipe 18. The spray branches 19 extend to the fins 10 respectively. The multiple spray branches 19 and multiple fins 10 are arranged alternately in an upper and lower manner. Each spray branch 19 sprays water onto a single heat transfer surface.

[0022] A bearing seat 20 is installed between the second liquid separation chamber 7 and the housing 1 for support and to reduce rotational resistance, such as Figure 3As shown, the bearing seat 20 is a ring structure, the bearing seat 20 includes the upper ring 21, the ball 22, the lower ring 23, the upper ring 21 lower surface and the lower ring 23 upper surface correspondingly set the circular groove, a plurality of balls 22 fill in the circular groove, the upper ring 21 and the lower ring 23 between through the ball 22 is rolled friction, the second sub-cavity 7 upper vertical installation liquid inlet pipe 9, liquid inlet pipe 9 is located in the center of the second sub-cavity 7, liquid inlet pipe 9 passes through the box 1, and liquid inlet pipe 9 and the box 1 between rotating seal connection, the second sub-cavity 7 bottom and the upper ring 21 abut, the bearing seat 20 with liquid inlet pipe 9 as the rotating center supports the heat exchange assembly.

[0023] The utility model discloses a working principle: tail gas flows horizontally through the gas inlet 2 to the gas outlet 3, personnel passes through the liquid inlet pipe 9 and imports the heat exchange fluid into the heat exchange assembly, and the heat exchange fluid passes through the annular liquid passage inside the second sub-cavity 7, the heat exchange pipe 6, the first sub-cavity 5, the liquid outlet 8 and the liquid outlet 17 from bottom to top in turn and is discharged, and the plurality of fins 10 on the heat exchange pipe 6 can accelerate the heat transfer efficiency, the gap between the fin 10 is less, and the dust in the tail gas can be adhered to the fin 10, and personnel starts the motor 13 regularly, and the motor 13 drives the liquid outlet pipe 8 to rotate through the meshing of the first gear 11 and the second gear 12, and the liquid outlet pipe 8 drives the first sub-cavity 5, the heat exchange pipe 6, the fin 10, the second sub-cavity 7 and the liquid inlet pipe 9 to rotate, and the dust adhered to the fin 10 is thrown out from the inside of the fin 10 under the action of centrifugal force, so that the quick cleaning function of the fin 10 is realized; part of the adhered dust is difficult to be directly thrown out, and after the waste heat recovery is paused, water is sprayed between the fins 10 through the liquid delivery pipe 18 and the liquid spray branch pipe 19, the water flow is uniformly distributed under the action of rotation and is thrown out to the periphery, and the dust can be quickly cleaned by using water; the fin 10 is usually made of iron or aluminum, and expands under the heat, so that the whole fin 10 is cut into a ring structure and is stacked, so that the fin 10 is prevented from being bent due to excessive expansion under the heat, and the air flow conduction and the adhered dust are affected; the bearing seat 20 is installed between the heat exchange assembly and the box 1, so that the heat exchange assembly can be stably supported, and the friction between the heat exchange assembly and the box 1 is reduced.

[0024] Although the utility model has carried out the detailed explanation to the foregoing embodiment, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A tail gas desulfurization and denitrification waste heat recovery device, characterized in that: The utility model provides a heat exchange device, including box (1), be provided with air inlet (2) and air outlet (3) on the box (1), air inlet (2) and air outlet (3) are opposite and located on the side of box (1), be provided with heat exchange subassembly in the box (1), and the heat exchange subassembly includes first sub -cavity (5), second sub -cavity (7), a plurality of heat exchange pipe (6), one end of heat exchange pipe (6) is communicated first sub -cavity (5), and the other end of heat exchange pipe (6) is communicated second sub -cavity (7) respectively, be provided with liquid outlet pipe (8) on first sub -cavity (5), be provided with liquid inlet pipe (9) on second sub -cavity (7), liquid outlet pipe (8) and liquid inlet pipe (9) respectively pass through the box (1), and both are rotatably connected between the box (1), be provided with a plurality of fins (10) on heat exchange pipe (6), the fin (10) is parallel to the direction of air inlet (2), air outlet (3) and is communicated, be provided with drive mechanism outside the box (1), and the drive mechanism drives heat exchange subassembly rotation.

2. The tail gas desulfurization and denitrification waste heat recovery device according to claim 1, characterized in that: The drive mechanism includes first gear (11), second gear (12), motor (13), the first gear (11) is sleeved on the liquid outlet pipe (8), the motor (13) is fixedly connected on the box (1), and the output end of motor (13) is fixedly connected second gear (12), and the first gear (11) is engagedly connected with second gear (12).

3. The tail gas desulfurization and denitrification waste heat recovery device according to claim 1, characterized in that: The fin (10) is annular structure, and the fins (10) between adjacent two heat exchange pipes (6) are partially stacked to form a single layer heat transfer surface, and the fins (10) are arranged in parallel to form a plurality of single layer heat transfer surfaces.

4. The tail gas desulfurization and denitrification waste heat recovery device according to claim 3, characterized in that: The middle part of the first sub -cavity (5) is provided with an opening (14), the liquid outlet pipe (8) is a double -walled sandwich cylindrical structure with an annular liquid passage inside, the liquid outlet pipe (8) is provided with a liquid delivery pipe (18) and a sealing plate (15), the sealing plate (15) is sleeved between the liquid outlet pipe (8) and rotatably connected with the inner wall of the liquid outlet pipe (8), the bottom end of the liquid delivery pipe (18) passes through the sealing plate (15) and extends to between a plurality of heat exchange pipes (6), a plurality of liquid injection branch pipes (19) are provided on the liquid delivery pipe (18), a plurality of liquid injection branch pipes (19) and a plurality of fins (10) are arranged in an up-down alternating manner, the liquid outlet pipe (8) is provided with a cover (16), the cover (16) is rotatably sealed with the liquid outlet pipe (8), the cover (16) is provided with a liquid outlet (17), and the liquid outlet (17) is communicated with the cavity of the double -walled sandwich of the liquid outlet pipe (8).

5. The tail gas desulfurization and denitrification waste heat recovery device according to claim 1, characterized in that: The second liquid separation cavity (7) and the box body (1) are provided with a bearing seat (20), the bearing seat (20) is a ring structure, the bearing seat (20) comprises an upper ring (21), a ball (22) and a lower ring (23), the lower surface of the upper ring (21) and the upper surface of the lower ring (23) are provided with a circular annular groove in correspondence, the ball (22) is filled in the circular annular groove, and the bottom of the second liquid separation cavity (7) abuts against the upper ring (21).

Images