Hot water recycling device for thermal power plant

Abstract

The invention belongs to the technical field of power plant hot water recycling, and discloses a hot water recycling device for a thermal power plant, which comprises a recycling tank, the upper surface of the recycling tank is provided with a water pumping mechanism, the inner cavity of the recycling tank is provided with a condensation cavity, a water storage cavity and a drainage cavity from top to bottom, and the condensation cavity is internally provided with a condensation mechanism. Through cooperation of the water storage mechanism, the limiting mechanism and the water pumping mechanism, when enough water is stored in a water storage space formed by the bottom plate, the top plate and the side plates, the floating plate gets close to the top plate under the action of buoyancy, then the inserting plate is inserted into the shell to abut against the limiting switch, and the limiting switch transmits a signal to the controller; and the controller controls the first water pump to pump water in the water storage mechanism into the circulating water tank, so that excessive water stored in the water storage mechanism is avoided, the load of the water storage mechanism is reduced, and the overall service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of hot water recovery in power plants, and in particular relates to a hot water recovery and reuse device for thermal power plants. Background Art

[0002] As the demand for electricity grew, people began to propose the idea of ​​establishing an electricity production center. With the development of motor manufacturing technology, the expansion of the application scope of electric energy, and the rapid growth of production demand for electricity, power plants came into being.

[0003] The condensation heat of the power plant is discharged into the atmosphere through the cooling tower or air cooling island, resulting in huge heat energy loss, making the energy utilization efficiency of the thermal power plant low, not only causing a large amount of energy and water waste, but also seriously polluting the atmosphere;

[0004] In the prior art, the Chinese utility model with publication number: CN213578815U discloses a waste heat recovery device for a power plant, including an air intake pipe and an air box that are interconnected, and also a water tank located at the lower side of the air box, wherein a plurality of support bars are fixed in the water tank, a filter screen is slidably placed on the upper side of the support bar, a sealing plate is fixed at one end of the filter screen, and the sealing plate is fixed to the outer wall of the water tank by bolts, and a water pump is provided on the outer side of the air box, a cold water inlet pipe is installed at the water inlet of the water pump, and a cold water outlet pipe is installed at the water outlet of the water pump. The waste heat recovery device of this scheme directly heats the cold water in the heating coil into hot water by inputting water vapor into the air box, and then discharges the hot water to the water point for use, so that the water vapor can be used more efficiently, and at the same time, the liquefied water generated by the water vapor can still be heated again after being gathered in the water tank, so as to be better used.

[0005] In the process of converting steam into distilled water, the recovery device of the above technical solution is prone to excessive collection of distilled water inside the recovery device, which leads to excessive water in the water tank during the steam recovery process, affecting the recovery efficiency.

[0006] To this end, we propose a hot water recovery and reuse device for thermal power plants to solve the problems existing in the prior art, so as to facilitate the recovery and utilization of the waste heat of hot steam in heating cold water, and collect the condensed water generated by condensing hot steam with cold water, thereby improving the recovery efficiency of hot steam and avoiding excessive pressure in the collection device caused by excessive condensed water, reducing the load in the collection device and prolonging the service life of the hot water recovery device. Summary of the invention

[0007] The object of the present invention is to provide a hot water recovery and reuse device for a thermal power plant, so as to solve the problem raised in the above background technology that in the process of converting steam into distilled water in the recovery device of the prior art, excessive distilled water is easily collected inside the recovery device, thereby causing excessive water in the water tank during the steam recovery process, affecting the recovery efficiency.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A hot water recovery and reuse device for a thermal power plant comprises a recovery tank, the upper surface of the recovery tank is provided with a pumping mechanism, the inner cavity of the recovery tank is provided with a condensation chamber, a water storage chamber and a drainage chamber from top to bottom, the condensation chamber is provided with a condensation mechanism, the water storage chamber is provided with a water storage mechanism, and the drainage chamber is provided with a filtering mechanism;

[0010] The water storage mechanism comprises a bottom plate, a side plate and a top plate, wherein the bottom plate is fixedly connected to the lower end of one side of the side plate, the top plate is fixedly connected to the upper end of one side of the side plate, a limit mechanism is arranged directly below the top plate, one end of the upper surface of the top plate is fixedly connected to a shell, and a limit switch is arranged at the top of the inner cavity of the shell;

[0011] The limit mechanism comprises a floating plate, one end of the upper surface of the floating plate is fixedly connected with a plug plate, and the plug plate is arranged directly below the limit switch;

[0012] The pumping mechanism comprises a first water pump fixedly connected to the upper surface of the recovery tank, and the water inlet end of the first water pump is connected to a pumping pipe, and the water inlet end of the pumping pipe is arranged above the bottom plate.

[0013] Preferably, four groups of perforated tubes are inserted into the lower surface of the top plate, the upper ends of the four groups of perforated tubes are connected to the condensation chamber, two groups of slide grooves are symmetrically opened on the outer sides of the four groups of perforated tubes, and the vertical cross-section of the inner cavity of the perforated tube is conical.

[0014] Preferably, the upper surface of the floating plate is provided with guide holes for sliding and plugging four groups of perforated catheters, and the upper ends of the guide holes are fixedly connected to two groups of connecting blocks, and the opposite sides of each two groups of connecting blocks are fixedly connected to a floating ball, and the floating ball is arranged in the inner cavity of the perforated catheter.

[0015] Preferably, the upper surface of the floating plate is provided with a plurality of water leakage holes, two sets of reset springs are symmetrically arranged on the top of the inner cavity of the shell, and the lower surface of the top plate is provided with a rectangular through hole near one end of the side plate for sliding insertion of the plug plate.

[0016] Preferably, three groups of fixed blocks are welded to one end of the outer side of the recovery tank, and a circulating water tank is fixedly connected to one side of the three groups of fixed blocks. A controller is provided on the upper surface of the circulating water tank, and a liquid level sensor is provided in the inner cavity of the circulating water tank. The controller is electrically connected to the liquid level sensor and the limit switch respectively.

[0017] Preferably, the condensing mechanism comprises a plurality of groups of coils, and the plurality of groups of coils are arranged at equal intervals in the condensing chamber, and two adjacent groups of coils are connected by a connecting pipe, and the water inlet end of the coil of the lower layer passes through a recovery tank and is connected to a first conduit, and the water outlet end of the coil of the upper layer passes through the recovery tank and is connected to a second conduit.

[0018] Preferably, the condensation mechanism also includes a second water pump arranged at the bottom of the inner cavity of the circulating water tank, the water outlet end of the second water pump is connected to one end of the first conduit, the water outlet end of the first water pump is connected to a drain pipe, one end of the drain pipe is connected to the circulating water tank, and an electromagnetic valve is installed on the water outlet pipe of the circulating water tank.

[0019] Preferably, the filtering mechanism includes a filter plate arranged in the drainage chamber, the middle part of the upper surface of the filter plate is rotatably connected to a second bevel gear, the lower end of the second bevel gear is fixedly connected to a scraper rod, the upper surface of the scraper rod is slidably connected to the lower surface of the filter plate, and the filter plate is fixedly connected to the lower end of the inner wall of the recovery tank.

[0020] Preferably, the filtering mechanism also includes a motor installed at the lower end of the outer side of the recovery tank, the output shaft of the motor is transmission-connected to a rotating shaft, one end of the rotating shaft passes through the recovery tank and is rotationally connected to a bearing seat, the bearing seat is fixedly connected to the inner wall of the recovery tank, and a first bevel gear is fixedly connected to the middle part of the outer side of the rotating shaft, and the first bevel gear is meshed with the second bevel gear.

[0021] Preferably, the lower end of the recovery tank is connected to a steam inlet pipe, and a check plate is fixedly connected to the inner wall of the recovery tank. The check plate is arranged in an "L" shape, and the short plate of the check plate is arranged parallel to the side plate, and the lower end of the short plate of the check plate is arranged at one-fifth of the height of the side plate.

[0022] The hot water recovery and reuse device for a thermal power plant proposed by the present invention has the following advantages compared with the prior art:

[0023] 1. The cooperation between the water storage mechanism, the limit mechanism and the pumping mechanism of the present invention is that when enough water is stored in the water storage space formed by the bottom plate, the top plate and the side plate, the floating plate approaches the top plate under the action of buoyancy, so that the plug plate is inserted into the shell and hits the limit switch. The limit switch transmits a signal to the controller, and the controller controls the first water pump to pump the water in the water storage mechanism into the circulating water tank, thereby avoiding excessive water storage in the water storage mechanism, thereby reducing the load of the water storage mechanism and improving the overall service life;

[0024] 2. The cooperation between the condensing mechanism, the circulating water tank and the pumping mechanism of the present invention increases the contact area with water vapor through multiple groups of coils, so that the condensed water droplets on the surface of the coils drop, and the water condensed from the water vapor is pumped to the circulating water tank through the pumping mechanism, and then pumped into the coils under the action of the second water pump to exchange heat with the water vapor, so as to recycle the condensed water of the water vapor and improve the utilization rate;

[0025] 3. The cooperation between the filter mechanism and the check plate of the present invention is that the motor drives the rotating shaft to drive the first bevel gear to engage the second bevel gear and then drives the scraper rod to scrape off the dirt attached to the lower surface of the filter plate, and the water vapor enters the condensation chamber through the gap between the check plate and the side plate to exchange heat with the water in the coil and condense. The check plate can avoid backflow caused by excessive water storage, thereby increasing the overall service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the recovery tank of the present invention;

[0028] Figure 3 It is a schematic diagram of the water storage mechanism structure of the present invention;

[0029] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0030] Figure 5 It is a schematic diagram of the structure of the filtering mechanism of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the limiting mechanism of the present invention;

[0032] Figure 7 It is a schematic diagram of the condensation mechanism structure of the present invention.

[0033] In the figure: 1, recovery tank; 2, circulating water tank; 3, steam inlet pipe; 4, filter mechanism; 41, filter plate; 42, motor; 43, rotating shaft; 44, first bevel gear; 45, second bevel gear; 46, scraper rod; 47, bearing seat; 5, water storage mechanism; 51, bottom plate; 52, side plate; 53, top plate; 54, perforated conduit; 55, slide groove; 56, housing; 57, limit switch; 58, reset spring; 6, limit mechanism; 61, floating plate; 62, Insert plate; 63, guide hole; 64, leaking hole; 65, float; 66, connecting block; 7, pumping mechanism; 71, first water pump; 72, pumping pipe; 73, drain pipe; 8, condensing mechanism; 81, second water pump; 82, first conduit; 83, coil; 84, connecting pipe; 85, second conduit; 9, controller; 10, liquid level sensor; 11, solenoid valve; 12, fixing block; 13, water storage chamber; 14, drainage chamber; 15, condensing chamber; 16, check plate. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] The present invention provides Figure 1-7 A hot water recovery and reuse device for a thermal power plant is shown, comprising a recovery tank 1, a pumping mechanism 7 is arranged on the upper surface of the recovery tank 1, a condensation chamber 15, a water storage chamber 13 and a drainage chamber 14 are arranged in the inner cavity of the recovery tank 1 from top to bottom, a condensation mechanism 8 is arranged in the condensation chamber 15, a water storage mechanism 5 is arranged in the water storage chamber 13, and a filtering mechanism 4 is arranged in the drainage chamber 14.

[0036] The water storage mechanism 5 includes a bottom plate 51, a side plate 52 and a top plate 53. The bottom plate 51 is fixedly connected to the lower end of one side of the side plate 52, and the top plate 53 is fixedly connected to the upper end of one side of the side plate 52. A limit mechanism 6 is arranged directly below the top plate 53. A shell 56 is fixedly connected to one end of the upper surface of the top plate 53, and a limit switch 57 is arranged at the top of the inner cavity of the shell 56.

[0037] The limit mechanism 6 includes a floating plate 61 , and an inserting plate 62 is fixedly connected to one end of the upper surface of the floating plate 61 . The inserting plate 62 is arranged directly below the limit switch 57 .

[0038] The pumping mechanism 7 includes a first water pump 71 fixedly connected to the upper surface of the recovery tank 1 , and the water inlet end of the first water pump 71 is connected to a pumping pipe 72 , and the water inlet end of the pumping pipe 72 is arranged above the bottom plate 51 .

[0039] Four groups of perforated tubes 54 are plugged into the lower surface of the top plate 53, and the upper ends of the four groups of perforated tubes 54 are all connected to the condensation chamber 15. Two groups of slide grooves 55 are symmetrically opened on the outer sides of the four groups of perforated tubes 54. The vertical cross-section of the inner cavity of the perforated tubes 54 is set in a conical shape. The four groups of perforated tubes 54 are used to limit the floating plate 61 when it is raised or lowered, so as to ensure that the plug plate 62 can be inserted into the shell 56, thereby facilitating the limit switch 57 to start the first water pump 71. At the same time, the perforated tubes 54 facilitate the condensate to flow into the water storage mechanism 5.

[0040] The upper surface of the float plate 61 is provided with guide holes 63 for sliding and plugging four groups of perforated conduits 54, and the upper ends of the guide holes 63 are fixedly connected with two groups of connecting blocks 66, and the opposite sides of each two groups of connecting blocks 66 are fixedly connected with a float 65, and the float 65 is arranged in the inner cavity of the perforated conduit 54. The float 65 improves the floating performance of the float plate 61, thereby improving the accuracy of detecting the water level in the water storage mechanism 5. At the same time, the connecting block 66 ensures that the float 65 and the float plate 61 are integrated, so that when the float 65 blocks the perforated conduit 54, the float plate 61 is in the highest position, the inner diameter of the upper end of the perforated conduit 54 is smaller than the inner diameter of the lower end, and the diameter of the float 65 is smaller than the inner diameter of the lower end of the perforated conduit 54, and the diameter of the float 65 is larger than the inner diameter of the upper end of the perforated conduit 54, which is convenient for blocking the perforated conduit 54.

[0041] A plurality of water leakage holes 64 are provided on the upper surface of the floating plate 61, two sets of return springs 58 are symmetrically arranged on the top of the inner cavity of the shell 56, and a rectangular through hole for sliding and plugging the plug plate 62 is provided on the lower surface of the top plate 53 near one end of the side plate 52. The water leakage holes 64 facilitate the floating plate 61 to float up, thereby ensuring that the water storage mechanism 5 collects condensed water.

[0042] Three groups of fixed blocks 12 are welded to one end of the outer side of the recovery tank 1, and a circulating water tank 2 is fixedly connected to one side of the three groups of fixed blocks 12. A controller 9 is provided on the upper surface of the circulating water tank 2, and a liquid level sensor 10 is provided in the inner cavity of the circulating water tank 2. The controller 9 is electrically connected to the liquid level sensor 10 and the limit switch 57 respectively. The circulating water tank 2 and the recovery tank 1 are integrated through the fixed block 12, so as to facilitate the continuous water supply to the condensing mechanism 8 and save water resources. The water level in the circulating water tank 2 is monitored by the liquid level sensor 10. When the water level is too high, the liquid level sensor 10 transmits a signal to the solenoid valve 11. After the solenoid valve 11 is opened, a certain amount of water is discharged to avoid excessive water accumulation in the circulating water tank 2.

[0043] The condensing mechanism 8 includes a plurality of groups of coils 83, which are arranged at equal intervals in the condensing chamber 15. Two adjacent groups of coils 83 are connected by a connecting pipe 84. The water inlet end of the lower coil 83 passes through the recovery tank 1 and is connected to a first conduit 82. The water outlet end of the upper coil 83 passes through the recovery tank 1 and is connected to a second conduit 85. The contact area between steam and condensed water is increased by the plurality of groups of coils 83, thereby improving the efficiency of condensing steam into water droplets. The condensed water after absorbing the heat energy of steam is heated and recycled through the second conduit 85, thereby reducing the waste of water resources.

[0044] The condensation mechanism 8 also includes a second water pump 81 arranged at the bottom of the inner cavity of the circulating water tank 2. The water outlet end of the second water pump 81 is connected to one end of the first conduit 82. The water outlet end of the first water pump 71 is connected to a drain pipe 73. One end of the drain pipe 73 is connected to the circulating water tank 2. An electromagnetic valve 11 is installed on the water outlet pipe of the circulating water tank 2. The steam condensate is pumped to the condensation chamber 15 through the second water pump 81 to exchange heat with the steam, thereby circulating water, reducing resource waste, and improving the hot water recovery efficiency of the thermal power plant.

[0045] The filtering mechanism 4 includes a filter plate 41 arranged in the drainage chamber 14, and a second bevel gear 45 is rotatably connected to the middle of the upper surface of the filter plate 41, and a scraper rod 46 is fixedly connected to the lower end of the second bevel gear 45. The upper surface of the scraper rod 46 is slidably connected to the lower surface of the filter plate 41. The filter plate 41 is fixedly connected to the lower end of the inner wall of the recovery tank 1. The filter plate 41 reduces the impurities in the steam from entering the condensation chamber 15, thereby ensuring the purity of the condensed water.

[0046] The filtering mechanism 4 also includes a motor 42 installed at the lower end of the outer side of the recovery tank 1. The output shaft of the motor 42 is connected to the rotating shaft 43. One end of the rotating shaft 43 passes through the recovery tank 1 and is rotatably connected to a bearing seat 47. The bearing seat 47 is fixedly connected to the inner wall of the recovery tank 1. A first bevel gear 44 is fixedly connected to the middle part of the outer side of the rotating shaft 43. The first bevel gear 44 is meshed with the second bevel gear 45. The rotating shaft 43 is driven by the motor 42 to drive the first bevel gear 44 to mesh with the second bevel gear 45, so that the scraper rod 46 scrapes off impurities on the lower surface of the filter plate 41 to maintain the steam pass rate of the filter plate 41.

[0047] The lower end of the recovery tank 1 is connected to the steam inlet pipe 3, and a check plate 16 is fixedly connected to the inner wall of the recovery tank 1. The check plate 16 is arranged in an "L" shape, and the short plate of the check plate 16 is arranged parallel to the side plate 52. The lower end of the short plate of the check plate 16 is arranged at one-fifth of the height of the side plate 52. The check plate 16 prevents condensed water from flowing back to the drainage chamber 14 when the floating plate 61 floats to the highest point, thereby ensuring the continuous use of the device.

[0048] When in use, the water vapor generated by thermal power generation is passed into the recovery tank 1 through the steam inlet pipe 3, and the impurities in the steam are filtered through the filtering mechanism 4, so that the steam enters the condensation chamber 15 through the gap between the side plate 52 and the check plate 16, and the second water pump 81 guides the condensed water in the circulating water tank 2 into the coil 83 through the first conduit 82, so that the condensed water and the steam are heat exchanged, and the steam is condensed on the outer wall of the coil 83 and then drips on the top plate 53, and the dripping water drops flow into the water storage mechanism 5 through the perforated conduit 54 for collection. When the collected water increases, the floating plate 61 floats up due to the buoyancy of the water, and is blocked when it floats to the top of the perforated conduit 54 through the float ball 65 to prevent water from continuously entering the water storage mechanism 5 In the water storage mechanism 5, excess water is temporarily stored above the top plate 53, and the check plate 16 is used to prevent water from flowing back into the drainage chamber 14. When the float plate 61 rises to the highest point, the plug plate 62 contacts the limit switch 57 in the shell 56. The limit switch 57 transmits a signal to the controller 9. The controller 9 controls the first water pump 71 to start, and then the water in the water storage mechanism 5 is pumped into the circulating water tank 2 through the water inlet pipe through the drain pipe 73 to provide water for the second water pump 81. After the water in the water storage mechanism 5 is reduced, the float plate 61 is separated from the top plate 53 under the action of the reset spring 58, so that the condensed water of water vapor is collected again, so as to avoid excessive backflow of condensed water in the water storage mechanism 5, reduce the water storage load, and thus improve the overall service life of the device.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hot water recovery and reuse device for a thermal power plant, comprising a recovery tank (1), characterized in that: The upper surface of the recovery tank (1) is provided with a pumping mechanism (7); the inner cavity of the recovery tank (1) is provided with a condensation chamber (15), a water storage chamber (13) and a drainage chamber (14) from top to bottom; the condensation chamber (15) is provided with a condensation mechanism (8); the water storage chamber (13) is provided with a water storage mechanism (5); and the drainage chamber (14) is provided with a filtering mechanism (4); The water storage mechanism (5) comprises a bottom plate (51), a side plate (52) and a top plate (53); the bottom plate (51) is fixedly connected to a lower end of one side of the side plate (52); the top plate (53) is fixedly connected to an upper end of one side of the side plate (52); a limit mechanism (6) is arranged directly below the top plate (53); a housing (56) is fixedly connected to one end of the upper surface of the top plate (53); and a limit switch (57) is arranged at the top of the inner cavity of the housing (56); The limit mechanism (6) comprises a floating plate (61), one end of the upper surface of the floating plate (61) is fixedly connected to a plug plate (62), and the plug plate (62) is arranged directly below the limit switch (57); The pumping mechanism (7) comprises a first water pump (71) fixedly connected to the upper surface of the recovery tank (1), and the water inlet end of the first water pump (71) is connected to a pumping pipe (72), and the water inlet end of the pumping pipe (72) is arranged above the bottom plate (51).

2. The hot water recovery and reuse device for a thermal power plant according to claim 1, characterized in that: Four groups of perforated conduits (54) are plugged into the lower surface of the top plate (53); the upper ends of the four groups of perforated conduits (54) are connected to the condensation chamber (15); two groups of slide grooves (55) are symmetrically provided on the outer sides of the four groups of perforated conduits (54); and the vertical cross-section of the inner cavity of the perforated conduits (54) is conical.

3. The hot water recovery and reuse device for a thermal power plant according to claim 2, characterized in that: The upper surface of the floating plate (61) is provided with guide holes (63) for sliding and plugging four groups of perforated conduits (54), and the upper ends of the guide holes (63) are fixedly connected with two groups of connection blocks (66), and the opposite sides of each two groups of connection blocks (66) are fixedly connected with a floating ball (65), and the floating ball (65) is arranged in the inner cavity of the perforated conduit (54).

4. The hot water recovery and reuse device for a thermal power plant according to claim 3, characterized in that: The upper surface of the floating plate (61) is provided with a plurality of water leakage holes (64), the inner top of the shell (56) is symmetrically provided with two groups of return springs (58), and the lower surface of the top plate (53) is provided with a rectangular through hole near one end of the side plate (52) for sliding insertion of the plug plate (62).

5. The hot water recovery and reuse device for a thermal power plant according to claim 1, characterized in that: Three groups of fixing blocks (12) are welded to one end of the outer side of the recovery tank (1), and one side of the three groups of fixing blocks (12) is fixedly connected to a circulating water tank (2), a controller (9) is arranged on the upper surface of the circulating water tank (2), a liquid level sensor (10) is arranged in the inner cavity of the circulating water tank (2), and the controller (9) is electrically connected to the liquid level sensor (10) and the limit switch (57) respectively.

6. The hot water recovery and reuse device for a thermal power plant according to claim 1, characterized in that: The condensing mechanism (8) comprises a plurality of groups of coils (83), wherein the plurality of groups of coils (83) are arranged at equal intervals in the condensing chamber (15), and two adjacent groups of coils (83) are connected to a connecting pipe (84), the water inlet end of the coils (83) at the lower layer passes through the recovery tank (1) and is connected to a first conduit (82), and the water outlet end of the coils (83) at the upper layer passes through the recovery tank (1) and is connected to a second conduit (85).

7. The hot water recovery and reuse device for a thermal power plant according to claim 6, characterized in that: The condensing mechanism (8) also includes a second water pump (81) arranged at the bottom of the inner cavity of the circulating water tank (2), the water outlet end of the second water pump (81) is connected to one end of the first conduit (82), the water outlet end of the first water pump (71) is connected to a drain pipe (73), one end of the drain pipe (73) is connected to the circulating water tank (2), and a solenoid valve (11) is installed on the water outlet pipe of the circulating water tank (2).

8. The hot water recovery and reuse device for a thermal power plant according to claim 1, characterized in that: The filtering mechanism (4) comprises a filtering plate (41) arranged in the drainage chamber (14); a second bevel gear (45) is rotatably connected to the middle of the upper surface of the filtering plate (41); a scraper rod (46) is fixedly connected to the lower end of the second bevel gear (45); the upper surface of the scraper rod (46) is slidably connected to the lower surface of the filtering plate (41); and the filtering plate (41) is fixedly connected to the lower end of the inner wall of the recovery tank (1).

9. The hot water recovery and reuse device for a thermal power plant according to claim 8, characterized in that: The filtering mechanism (4) further comprises a motor (42) mounted at the lower end of the outer side of the recovery tank (1); the output shaft of the motor (42) is drivingly connected to a rotating shaft (43); one end of the rotating shaft (43) passes through the recovery tank (1) and is rotatably connected to a bearing seat (47); the bearing seat (47) is fixedly connected to the inner wall of the recovery tank (1); a first bevel gear (44) is fixedly connected to the middle part of the outer side of the rotating shaft (43); the first bevel gear (44) is meshed with a second bevel gear (45).

10. The hot water recovery and reuse device for a thermal power plant according to claim 1, characterized in that: The lower end of the recovery tank (1) is connected to a steam inlet pipe (3), and a check plate (16) is fixedly connected to the inner wall of the recovery tank (1). The check plate (16) is arranged in an "L" shape, and the short plate of the check plate (16) is arranged in parallel with the side plate (52), and the lower end of the short plate of the check plate (16) is arranged at one fifth of the height of the side plate (52).

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