Power plant waste heat recovery device

Abstract

The utility model belongs to the technical field of power plant waste heat recovery, and particularly relates to a power plant waste heat recovery device which comprises a foot stool, a dust removal box is installed on the foot stool, an air inlet pipe is installed on the side wall of the dust removal box, a fixing plate is installed on the inner wall of the dust removal box, and a rotating plate penetrates through the fixing plate. The rotating plate is rotationally connected with the fixed plate through a bearing, a filter bag is fixedly mounted in a mounting hole of the rotating plate, the outer wall of the rotating plate is fixedly sleeved with a first gear, a motor is mounted on the inner wall of the dust removal box through a machine base, and in the process that flue gas enters the dust removal box from the gas inlet pipe, a second gear pushes the first gear to rotate; the first gear drives the rotating plate to rotate, and the rotating plate drives the six groups of filter bags on the rotating plate to rotate, so that the position movement of the six groups of filter bags is realized, flue gas is prevented from being fixedly jetted to a certain filter bag when entering the dust removal box, the filter bags are prevented from being easily damaged for a long time, the protection property of the filter bags is improved, and the impurity removal effect is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery in power plants, in particular to a waste heat recovery device in power plants. Background Art

[0002] Waste heat includes waste heat from high-temperature exhaust gas, waste heat from cooling medium, waste heat from waste steam and waste water, waste heat from high-temperature products and slag, waste heat from chemical reactions, and waste heat from combustible waste gas, waste liquid, and waste materials. Currently, the types of materials burned in power plants are relatively complex, and generally a large amount of flue gas will be generated. In the process of recovering waste heat from flue gas, a waste heat recovery device is required.

[0003] A Chinese patent with publication number CN213930876U discloses a waste heat recovery device for a power plant, including a combustion furnace, a heat exchanger and a heat user. A heating pipe is arranged in the side wall of the combustion furnace, a boiler drum is arranged at the upper end of the combustion furnace, the boiler drum is connected to the heating pipe, the boiler drum is connected to the steam-water heat exchanger through a steam pipe network, the steam-water heat exchanger is connected to the heat exchanger through a primary pipe network, the combustion furnace is connected to a flue gas pipe, the flue gas pipe is connected to a desulfurization and dust removal tower, a flue gas heater is arranged on the flue gas pipe, a secondary network return pipe passes through the flue gas heater, the heating pipe absorbs the temperature of the combustion furnace and turns into water vapor, the water vapor in the boiler drum completes the heat exchange between the steam-water heat exchanger and the heat exchanger through the steam pipe network and the primary pipe network, thereby improving the utilization rate of thermal energy, the high-temperature flue gas in the flue pipe is passed into the flue gas heater to heat the water in the secondary network return pipe after releasing the heat, thereby improving the utilization rate of energy and ensuring the temperature of the hot water when it reaches the heat user.

[0004] In the process of recovering waste heat from flue gas, the existing waste heat recovery device of a power plant needs to remove impurities from the flue gas. Since the impurity removal structure is a fixed structure, it is easy to cause damage to the impurity removal structure over a long period of time, resulting in poor impurity removal effect. Therefore, a waste heat recovery device for a power plant is proposed to address the above problem. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art and solve the problems existing in the prior art, the utility model proposes a waste heat recovery device for a power plant.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a waste heat recovery device for a power plant described in the utility model comprises a tripod, a dust removal box is installed on the tripod, an ash hopper is fixedly installed on the bottom side of the dust removal box, an exhaust pipe is connected to the top side of the ash hopper, an electromagnetic valve is installed on the exhaust pipe, a control panel is installed on the dust removal box, the electromagnetic valve is connected to the control panel through an internal circuit, an air intake pipe is installed on the side wall of the dust removal box, a fixed plate is installed on the inner wall of the dust removal box, a rotating plate passes through the fixed plate, the rotating plate is rotatably connected to the fixed plate through a bearing, six groups of mounting holes are opened on the rotating plate, and the mounting holes of the rotating plate are fixed with the rotating plate. A filter bag is fixedly installed, a first gear is fixedly sleeved on the outer wall of the rotating plate, a motor is installed on the inner wall of the dust removal box through a machine base, and a second gear is fixedly installed on the output shaft of the motor, the second gear and the first gear are meshed with each other, and in the process of smoke entering the dust removal box from the air intake pipe, the motor operates to drive the second gear to rotate, the second gear pushes the first gear to rotate, the first gear drives the rotating plate to rotate, and the rotating plate drives the six groups of filter bags thereon to rotate, thereby realizing the position movement of the six groups of filter bags, avoiding fixed spraying of a certain filter bag when smoke enters the dust removal box, which is easy to cause damage to the filter bag for a long time, improving the protection of the filter bag, and beneficial to improving the impurity removal effect.

[0007] Preferably, an air bag is fixedly mounted on the outer wall of the dust removal box, an air duct is connected to the air bag, a pulse valve is installed on the air duct, a pulse controller is fixedly mounted on the outer wall of the dust removal box, the pulse controller is connected to the pulse valve through an internal circuit, an air plate is fixedly mounted on the top plate of the dust removal box, six groups of injection pipes are installed on the air plate, dust particles are trapped on the inner side of the filter bag, as time goes by, more and more dust accumulates on the surface of the filter bag, a command is issued through the control panel to close the solenoid valve, the exhaust pipe is closed, and the flue gas is stopped from being filtered, then the pulse controller sends a signal to the pulse valve, the pulse valve allows the high-pressure reverse airflow to be sent into the air plate and ejected from the injection pipe, causing the filter bag to expand and shake rapidly, causing the dust attached to the outside of the filter bag to fall off, thereby achieving the purpose of cleaning, which is beneficial to improving the cleaning efficiency of the filter bag.

[0008] Preferably, a heat exchange box is connected to the other side of the exhaust pipe, a support frame is installed on the bottom side of the heat exchange box, a heat exchange pipe is fixedly installed inside the heat exchange box, a first delivery pipe is connected to the heat exchange pipe, a circulating pump is installed on the first delivery pipe, a heat exchanger is connected to the other end of the first delivery pipe, a second delivery pipe is connected to the heat exchanger, a water tank is connected to the other end of the second delivery pipe, a third delivery pipe is connected to the other end of the water tank, and the other end of the third delivery pipe is connected to the heat exchange pipe, the heat exchanger and the water tank are installed on the support frame, and the dust-containing smoke enters the dust removal box from the air intake pipe, and some larger dust particles are inert The dust particles will fall into the ash hopper through the action of the air or naturally settle, while the smaller dust particles will enter the filter bag with the air flow and be filtered by the filter bag. Then the pure flue gas will enter the heat exchange box from the exhaust pipe. The flue gas will exchange heat with the exchange fluid in the heat exchange tube. The heat of the flue gas will enter the exchange fluid. Then the heat exchange fluid in the heat exchange tube will be led into the heat exchanger through the action of the circulating pump. The heat exchanger will use the heat energy of the exchange fluid to realize the utilization of the waste heat of the power plant. Then the cooled exchange fluid will enter the water tank and then enter the heat exchange tube from the water tank to exchange heat with the flue gas again, thus realizing the circulation of the exchange fluid and the waste heat recovery, which is beneficial to improving the waste heat recovery efficiency.

[0009] The utility model is beneficial in that:

[0010] 1. In the process of smoke entering the dust removal box from the air inlet pipe, the utility model operates the motor to drive the second gear to rotate, the second gear pushes the first gear to rotate, the first gear drives the rotating plate to rotate, and the rotating plate drives the six groups of filter bags thereon to rotate, thereby realizing the position movement of the six groups of filter bags, avoiding fixed spraying of a certain filter bag when smoke enters the dust removal box, which is easy to cause damage to the filter bag for a long time, thereby improving the protection of the filter bag and facilitating improving the impurity removal effect; by intercepting dust particles on the inner side of the filter bag, as time goes by, more and more dust accumulates on the surface of the filter bag, and a command is issued through the control panel to close the solenoid valve, so that the exhaust pipe is closed and the smoke is stopped from filtering. Subsequently, the pulse controller sends a signal to the pulse valve, and the pulse valve allows the high-pressure reverse airflow to be sent into the air plate and sprayed out from the injection pipe, so that the filter bag expands and shakes rapidly, causing the dust attached to the outside of the filter bag to fall off, thereby achieving the purpose of cleaning, which is beneficial to improving the cleaning efficiency of the filter bag.

[0011] 2. The utility model allows dust-containing flue gas to enter the dust removal box from the air inlet pipe, and some larger dust particles fall into the ash hopper due to inertia or natural sedimentation, while smaller dust particles enter the filter bag with the airflow and are filtered by the filter bag. Then, the pure flue gas enters the heat exchange box from the exhaust pipe, and the flue gas exchanges heat with the exchange liquid in the heat exchange tube, and the heat of the flue gas enters the exchange liquid. Then, through the action of the circulating pump, the heat exchange liquid in the heat exchange tube is guided into the heat exchanger, and the heat exchanger uses the thermal energy of the exchange liquid, thereby realizing the utilization of the waste heat of the power plant. Then, the cooled exchange liquid enters the water tank, and then enters the heat exchange tube from the water tank to exchange heat with the flue gas again, thereby realizing the circulation of the exchange liquid and the waste heat recovery, which is beneficial to improving the waste heat recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 It is a schematic diagram of a three-dimensional structure from a first-person perspective;

[0014] Figure 2 It is a schematic diagram of the three-dimensional structure of the dust removal structure;

[0015] Figure 3 It is a schematic diagram of the three-dimensional structure of the dust cleaning structure;

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the heat exchange box.

[0017] In the figure: 1. tripod; 2. dust removal box; 3. ash hopper; 4. exhaust pipe; 5. solenoid valve; 6. control panel; 7. air inlet pipe; 8. fixed plate; 9. rotating plate; 10. filter bag; 11. first gear; 12. motor; 13. second gear; 14. air bag; 15. air guide pipe; 16. pulse valve; 17. pulse controller; 18. air plate; 19. injection pipe; 20. heat exchange box; 21. support frame; 22. heat exchange pipe; 23. first delivery pipe; 24. circulation pump; 25. heat exchanger; 26. second delivery pipe; 27. water tank; 28. third delivery pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-4As shown, a waste heat recovery device for a power plant includes a tripod 1, a dust removal box 2 is installed on the tripod 1, an ash hopper 3 is fixedly installed on the bottom side of the dust removal box 2, an exhaust pipe 4 is connected to the top side of the ash hopper 3, an electromagnetic valve 5 is installed on the exhaust pipe 4, a control panel 6 is installed on the dust removal box 2, the electromagnetic valve 5 is connected to the control panel 6 through an internal circuit, an air intake pipe 7 is installed on the side wall of the dust removal box 2, a fixed plate 8 is installed on the inner wall of the dust removal box 2, a rotating plate 9 is penetrated through the fixed plate 8, the rotating plate 9 is rotatably connected to the fixed plate 8 through a bearing, six groups of mounting holes are opened on the rotating plate 9, filter bags 10 are fixedly installed in the mounting holes of the rotating plate 9, a first gear 11 is fixedly sleeved on the outer wall of the rotating plate 9, and the inner wall of the dust removal box 2 is mounted on the base through the base. A motor 12 is installed, and a second gear 13 is fixedly installed on the output shaft of the motor 12, and the second gear 13 is meshed with the first gear 11. An air bag 14 is fixedly installed on the outer wall of the dust removal box 2, and an air guide pipe 15 is connected to the air bag 14, and a pulse valve 16 is installed on the air guide pipe 15. A pulse controller 17 is fixedly installed on the outer wall of the dust removal box 2, and the pulse controller 17 is connected to the pulse valve 16 through an internal circuit. An air plate 18 is fixedly installed on the top plate of the dust removal box 2, and six groups of injection pipes 19 are installed on the air plate 18. A heat exchange box 20 is connected to the other side of the exhaust pipe 4, and a support frame 21 is installed on the bottom side of the heat exchange box 20. A heat exchange tube 22 is fixedly installed inside the heat exchange box 20, and the heat exchange tube 22 is connected There is a first delivery pipe 23, a circulating pump 24 is installed on the first delivery pipe 23, the other end of the first delivery pipe 23 is connected to a heat exchanger 25, the heat exchanger 25 is connected to a second delivery pipe 26, the other end of the second delivery pipe 26 is connected to a water tank 27, the other end of the water tank 27 is connected to a third delivery pipe 28, the other end of the third delivery pipe 28 is connected to the heat exchange pipe 22, and the heat exchanger 25 and the water tank 27 are installed on the support frame 21; when working, the existing power plant waste heat recovery device needs to remove impurities from the flue gas during the process of recovering the waste heat of the flue gas. Since the impurity removal structure is a fixed structure, it is easy to cause the impurity removal structure to be damaged for a long time, resulting in poor impurity removal effect. The dust-containing flue gas enters the dust removal box 2 from the air inlet pipe 7, Some larger dust particles fall into the ash hopper 3 due to inertia or natural sedimentation, while smaller dust particles enter the filter bag 10 with the air flow and are filtered by the filter bag 10; then the pure flue gas enters the heat exchange box 20 from the exhaust pipe 4, and the flue gas exchanges heat with the exchange liquid in the heat exchange tube 22, and the heat of the flue gas enters the exchange liquid. Then, through the action of the circulating pump 24, the heat exchange liquid in the heat exchange tube 22 is guided into the heat exchanger 25, and the heat exchanger 25 uses the heat energy of the exchange liquid, realizing the utilization of the waste heat of the power plant. Then, the cooled exchange liquid enters the water tank 27, and then enters the heat exchange tube 22 from the water tank 27 to exchange heat with the flue gas again, realizing the circulation of the exchange liquid and the recovery of waste heat;Dust particles are trapped inside the filter bag 10. As time goes by, more and more dust accumulates on the surface of the filter bag 10. A command is issued through the control panel 6 to close the solenoid valve 5, so that the exhaust pipe 4 is closed and the flue gas is stopped from filtering. Subsequently, the pulse controller 17 sends a signal to the pulse valve 16. The model of the pulse controller 17 is AM-P02. The pulse valve 16 allows the high-pressure reverse airflow to be sent into the air plate 18 and ejected from the injection pipe 19, so that the filter bag 10 expands and shakes rapidly, causing the dust attached to the outside of the filter bag 10 to fall off, and then To achieve the purpose of dust removal; when the smoke enters the dust removal box 2 from the air intake pipe 7, the motor 12 is operated to drive the second gear 13 to rotate, the second gear 13 drives the first gear 11 to rotate, the first gear 11 drives the rotating plate 9 to rotate, and the rotating plate 9 drives the six groups of filter bags 10 thereon to rotate, so as to achieve the position movement of the six groups of filter bags 10, avoid fixed spraying of a certain filter bag 10 when the smoke enters the dust removal box 2, and easily damage the filter bag 10 for a long time, thereby improving the protection of the filter bag 10 and improving the impurity removal effect. ;

[0020] Working principle: In the process of recovering waste heat from flue gas, the existing waste heat recovery device of a power plant needs to remove impurities from the flue gas. Since the impurity removal structure is a fixed structure, it is easy to cause damage to the impurity removal structure over a long period of time, resulting in poor impurity removal effect. The dust-containing flue gas enters the dust removal box 2 from the air inlet pipe 7. Some larger dust particles fall into the ash hopper 3 due to inertia or natural sedimentation, while smaller dust particles enter the filter bag 10 with the air flow and are filtered by the filter bag 10; then the pure flue gas enters the heat exchange box 20 from the exhaust pipe 4, and the flue gas The heat exchange is carried out with the exchange liquid in the heat exchange tube 22, and the heat of the flue gas enters into the exchange liquid. Then, through the action of the circulating pump 24, the heat exchange liquid in the heat exchange tube 22 is led into the heat exchanger 25. The heat exchanger 25 uses the heat energy of the exchange liquid, realizing the utilization of the waste heat of the power plant. Then, the cooled exchange liquid enters into the water tank 27, and then enters into the heat exchange tube 22 from the water tank 27 to exchange heat with the flue gas again, realizing the circulation of the exchange liquid and realizing the waste heat recovery. On the inner side of the filter bag 10, the dust particles are Interception, as time goes by, more and more dust accumulates on the surface of the filter bag 10, and a command is issued through the control panel 6 to close the solenoid valve 5, so that the exhaust pipe 4 is closed and the flue gas is stopped from filtering. Subsequently, the pulse controller 17 sends a signal to the pulse valve 16. The model of the pulse controller 17 is AM-P02. The pulse valve 16 allows the high-pressure reverse airflow to be sent into the air plate 18 and sprayed out from the injection pipe 19, so that the filter bag 10 expands and shakes rapidly, so that the dust attached to the outside of the filter bag 10 falls off, thereby achieving the purpose of cleaning; in the process of the flue gas entering the dust removal box 2 from the air intake pipe 7, the motor 12 is operated to drive the second gear 13 to rotate, the second gear 13 drives the first gear 11 to rotate, the first gear 11 drives the rotating plate 9 to rotate, and the rotating plate 9 drives the six groups of filter bags 10 thereon to rotate, so as to realize the position movement of the six groups of filter bags 10, avoid fixed spraying of a certain filter bag 10 when the flue gas enters the dust removal box 2, and easily damage the filter bag 10 for a long time, improve the protection of the filter bag 10, and help to improve the impurity removal effect.

[0021] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A waste heat recovery device for a power plant, characterized in that : comprising a tripod (1), a dust removal box (2) is installed on the tripod (1), a dust hopper (3) is fixedly installed on the bottom side of the dust removal box (2), an exhaust pipe (4) is connected to the top side of the ash hopper (3), an electromagnetic valve (5) is installed on the exhaust pipe (4), a control panel (6) is installed on the dust removal box (2), the electromagnetic valve (5) is connected to the control panel (6) through an internal circuit, an air intake pipe (7) is installed on the side wall of the dust removal box (2), a fixing plate (8) is installed on the inner wall of the dust removal box (2), and the fixing plate (8) is installed on the inner wall of the dust removal box (2). ) is penetrated by a rotating plate (9), the rotating plate (9) is rotatably connected to the fixed plate (8) through a bearing, the rotating plate (9) is provided with six groups of mounting holes, a filter bag (10) is fixedly installed in the mounting holes of the rotating plate (9), a first gear (11) is fixedly sleeved on the outer wall of the rotating plate (9), a motor (12) is installed on the inner wall of the dust removal box (2) through a machine base, a second gear (13) is fixedly installed on the output shaft of the motor (12), and the second gear (13) is meshed with the first gear (11).

2. A power plant waste heat recovery device according to claim 1, characterized in that: An air bag (14) is fixedly mounted on the outer wall of the dust removal box (2), an air guide pipe (15) is connected to the air bag (14), and a pulse valve (16) is mounted on the air guide pipe (15).

3. The power plant waste heat recovery device according to claim 1, characterized in that: A pulse controller (17) is fixedly mounted on the outer wall of the dust removal box (2), and the pulse controller (17) is connected to the pulse valve (16) via an internal circuit.

4. The power plant waste heat recovery device according to claim 1, characterized in that: An air plate (18) is fixedly mounted on the top plate of the dust removal box (2), and six groups of injection pipes (19) are mounted on the air plate (18).

5. The power plant waste heat recovery device according to claim 1, characterized in that: The other side of the exhaust pipe (4) is connected to a heat exchange box (20), a support frame (21) is installed on the bottom side of the heat exchange box (20), and a heat exchange pipe (22) is fixedly installed inside the heat exchange box (20).

6. A power plant waste heat recovery device according to claim 5, characterized in that: The heat exchange tube (22) is connected to a first delivery tube (23), a circulation pump (24) is installed on the first delivery tube (23), the other end of the first delivery tube (23) is connected to a heat exchanger (25), the heat exchanger (25) is connected to a second delivery tube (26), the other end of the second delivery tube (26) is connected to a water tank (27), the other end of the water tank (27) is connected to a third delivery tube (28), the other end of the third delivery tube (28) is connected to the heat exchange tube (22), and the heat exchanger (25) and the water tank (27) are installed on a support frame (21).

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