Heat exchange box set used in thermal power plant and cleaning method

Abstract

The invention discloses a heat exchange box set used in a thermal power plant and a cleaning method, and relates to the technical field of thermal power plant heat exchange. Comprising a cylindrical shell, and the upper end and the lower end of the cylindrical shell are fixedly connected with the inner wall of the heat exchange water tank; a supporting rod is mounted in the cylindrical shell; a scraping rod frame is installed on the supporting rod, and the scraping rod frame and the supporting rod are each provided with a built-in cavity and communicate with each other. A liquid outlet hole is formed in the scraping rod frame; a bottom plate is arranged at the bottom of the heat exchange cylinder, and a second drain outlet is formed in the bottom plate; a first drain outlet is formed in the inner bottom side of the heat exchange water tank, and the size of the first drain outlet is larger than that of the second drain outlet; an electromagnetic valve is mounted at the second drain outlet; and a cleaning assembly. The device has the advantages that scale removal can be carried out on the heat exchange cylinder without disassembly in the continuous heat exchange process, and it is guaranteed that circulating water can be continuously filtered.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange in thermal power plants, and in particular to a heat exchange box group used in thermal power plants and a cleaning method thereof. Background Art

[0002] The heat exchange system in the heat exchange station of a thermal power plant is its core component, which is mainly responsible for the transfer and conversion of heat energy to ensure that heat energy is effectively transferred from the heat source to the area or building that needs heating. At present, the thermal system of the heat exchange station consists of a primary water supply and return system, a secondary water supply and return system, a water replenishment system, and a heat metering system. The various parts are interrelated and interact with each other. The heat source enters the heat exchanger through the primary water supply pipeline to provide heat. After sufficient heat exchange, the hot water is cooled and then flows back to the heat source through the primary return pipe. The low-temperature water in the secondary water supply pipe is fully heated in the heat exchanger and enters the heat user through the secondary return pipe. After the user obtains the heat, the circulating pump pumps the water back to the secondary water inlet pipeline and then enters the heat exchanger, and the heat is circulated to supply heat to the user. The heat source water tank supplies hot water to the heat exchange water tank, and the user water tank supplies cold water to the heat exchange water tank.

[0003] During the heat exchange cycle, it is necessary to use a dirt remover to filter the circulating water in the water pipe. The common filtering method is to filter through a filter. After long-term use, a lot of debris will accumulate on the surface of the filter, which can easily affect the filtering effect of the filter and reduce the heat exchange effect of the water during the circulation process. In the crossover part of the heat exchange temperature in the heat exchange water tank, the sudden rise or fall of temperature can easily cause some minerals to precipitate and produce scale.

[0004] Conventional scale cleaning workers usually need to disassemble various parts of the heat exchange device, and then use various agents and tools to clean the inside of the heat exchange device. This operation not only increases the workload of the workers, but also reduces the efficiency of the heat exchange device. To this end, we provide a heat exchange box group and cleaning method for thermal power plants to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art and to provide a heat exchange box group and a cleaning method for use in a thermal power plant, which can remove scale from the heat exchange cylinder without disassembly during continuous heat exchange, thereby ensuring that the circulating water can be continuously filtered.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a heat exchange box group used in a thermal power plant, comprising:

[0007] A heat source water tank, wherein the heat source water tank is suitable for storing hot water;

[0008] A user water tank, which is used to supply water to users and is filled with cold water;

[0009] A heat exchange water tank, wherein a heat exchange cylinder is installed in the middle of the heat exchange water tank and is connected to the heat source water tank and the user water tank on both sides through water pipes;

[0010] A filter assembly, the filter assembly is installed in the water exchange tank;

[0011] The heat exchange cylinder comprises a cylindrical shell, the upper and lower ends of which are fixedly connected to the inner wall of the water exchange tank; a support rod is installed in the cylindrical shell; a scraper frame is installed on the support rod, and the scraper frame and the support rod are both provided with built-in cavities and are connected; liquid outlet holes are provided on the scraper frame, and are distributed on both sides of the scraper frame surface; a bottom plate is provided at the bottom of the heat exchange cylinder, and a second sewage outlet is provided on the bottom plate; the upper end of the support rod is connected to the water exchange tank through a connecting bearing, and the lower end is connected to the bottom plate through a connecting bearing; a first sewage outlet is provided on the bottom side of the water exchange tank, and the size of the first sewage outlet is larger than that of the second sewage outlet; an electromagnetic valve is installed at the second sewage outlet;

[0012] The cleaning assembly comprises a top box, the bottom of which is communicated with the built-in cavity of the support rod; and a cleaning piece is installed in the support rod, and the cleaning piece is suitable for driving the liquid outlet hole of the cleaning scraper frame.

[0013] In a further technical solution, the scraper frame includes an upper inclined plate, a side scraper, a vertical rod and a bottom plate, the upper inclined plate is inclined downward, and the bottom is connected to the top of the vertical rod; the vertical rod is provided with multiple groups, and liquid outlet holes are provided on both sides of the vertical rod; the bottom of the vertical rod is connected to the bottom plate; the upper and lower ends of the side scraper are respectively connected to the ends of the upper inclined plate and the bottom plate, and are suitable for friction with the inner wall of the heat exchange cylinder;

[0014] Slag pushing plates are arranged on both sides of the bottom plate, and the slag pushing plates are arranged in an arc shape with the arc center arranged downward.

[0015] In a further technical solution, the cleaning member includes a built-in long rod, the bottom of the top box is provided with a stepped opening, and a movable plate is movably connected in the stepped opening, the movable plate is movably connected in the stepped opening and is suitable for opening and closing the top box and the built-in cavity of the support rod;

[0016] A cleaning sleeve is sleeved on the outer side of the vertical rod, and the end of the cleaning sleeve extends into the built-in cavity of the support rod and is connected to the built-in long rod.

[0017] In a further technical solution, a sliding hole is provided in the cleaning sleeve, and a brush head is arranged in the sliding hole, and the brush head is suitable for cleaning the liquid outlet hole; a filter is installed in the liquid outlet hole, and the filter is connected to the scraper rod frame; a connecting part is provided at the end of the cleaning sleeve, and sliding plates are installed at the upper and lower ends of the connecting part, a sliding groove is provided in the support rod, and the sliding plate is suitable for sliding in the sliding groove.

[0018] In a further technical solution, the filter assembly includes a support frame fixed to the inner wall of the water exchange tank and a filter plate clamped on the surface of the support frame, and the filter assembly is fixed inside the water exchange tank by a fixing assembly;

[0019] A slider 1 is fixed to the lower surface of the filter plate, a first slide groove is provided on the surface of the support frame, and the slider 1 moves in the first slide groove. The slider 1 and the first slide groove of the filter plate move on the surface of the support frame. There are two sliders 1 and two first slide grooves, which are symmetrically arranged on the lower surface of the filter plate. A movable groove corresponding to the filter plate is provided on the surface of the processing box, and the movable groove is "H" shaped.

[0020] In a further technical solution, a second placement groove is opened inside the heat exchange cylinder, and a first placement groove is opened on the surface of the water exchange tank. The first placement groove is connected to the second placement groove. An electromagnet is installed inside the second placement groove. The electromagnet is "U" shaped, and the N and S poles of the electromagnet are gradually flipped. The side scraper is made of magnet.

[0021] In a further technical solution, it also includes a fixing component, which includes a knob arranged on the surface of the processing box, a transmission compartment is opened inside the processing box, a threaded rod is fixed to the lower end of the knob, the lower end of the threaded rod is rotatably passed through the transmission compartment, a threaded tube is threadedly connected to the surface of the threaded rod, a pushing block is fixed to the lower end of the threaded tube, a telescopic groove is opened on the surface of the support frame, the telescopic groove is connected to the transmission compartment, a first limit rod is arranged below the push block, and the first limit rod is arranged in the telescopic groove.

[0022] In a further technical solution, a first slot is provided on the surface of the filter plate, one end of the first limit rod is clamped in the first slot, the first limit rod and the push block are perpendicular to each other, a transverse spring is also sleeved on the surface of the first limit rod, a slider 2 is fixed to the side of the threaded tube, a second slot is provided on the surface of the transmission bin, the slider 2 moves in the second slot, the threaded tube moves in the transmission bin through a knob, a threaded rod, a slider 2 and a second slot, there are two of the slider 2 and the second slot, and they are symmetrically arranged on both sides of the threaded tube.

[0023] In a further technical solution, the heat exchange water tank is respectively provided with a heat source water inlet, a heat source water return inlet, a user water inlet and a user water return inlet on both sides, and the heat source water inlet and the heat source water return inlet are located on the same side, and the user water inlet and the user water return inlet are located on the same side; the heat source water tank is respectively connected with the heat source water inlet and the heat source water return inlet through water pipes; the user water tank is respectively connected with the user water inlet and the user water return inlet through water pipes.

[0024] A method for cleaning a heat exchanger group in a thermal power plant comprises the following steps:

[0025] A. Stop the water pipes connecting the heat source water tank, the user water tank and the heat exchange water tank, open the top tank, and fill the top tank with a cleaning agent for removing dirt; fill the heat exchange water tank with more than 8% of mixed water;

[0026] B. An electric push rod is installed on the top of the top box, and the output end extends into the top box and is connected to the built-in long rod; after adding the cleaning agent, open the electric push rod;

[0027] The electric push rod drives the built-in long rod upward, and the movable plate opens, so that the cleaning agent enters the support rod; the cleaning agent is filled in the built-in cavity of the support rod, flows into the scraper frame, and flows out through the liquid outlet hole;

[0028] C. The electric push rod is driven up and down reciprocatingly, driving the cleaning sleeve at the bottom of the built-in long rod to move up and down along the vertical rod, so that the cleaning sleeve can clean multiple groups of liquid outlet holes;

[0029] D. By controlling the N and S poles of the electromagnet, the side scraper is attracted to each other, driving the side scraper to rotate. When the side scraper rotates to the side of the electromagnet, the magnetic pole of the electromagnet is adjusted to make it repel each other with the side scraper, pushing the side scraper to rotate, thereby realizing the circular motion of the side scraper, and then scraping the inner wall of the heat exchange cylinder. At the same time, the scraped scale falls on the bottom plate, and the bottom plate does not rotate with the support rod, and is pushed by the slag pusher to circle into the first and second sewage outlets;

[0030] E. Repeat steps AD to ensure the cleaning effect; then open the solenoid valve to discharge the cleaned scale and sewage; fill with hot water for flushing, then detect the residual concentration, and complete the cleaning after meeting the standard.

[0031] Compared with the prior art, the beneficial effects are:

[0032] 1. The present invention controls the magnetic poles of the electromagnet so that the scraper frame can scrape the inner wall of the heat exchange tube, and the slag pusher plate at the bottom can push the scale that falls on the bottom plate into the second sewage outlet. When the first sewage outlet is connected to the second sewage outlet, the scale falls into the electromagnetic valve, thereby realizing centralized cleaning of the scale, reducing the workload of the staff and improving the efficiency of the heat exchange device. At the same time, the electromagnet can construct a magnetic field in the heat exchange tube, so that the impurities in the heat exchange tube are charged, and finally generate a potential to become a polar substance, which can further prevent the calcium and magnesium ions in the water from adhering to the inner wall of the heat exchange tube to generate scale.

[0033] 2. The filter assembly of the present invention can replace the filter plate during the circulation heat exchange process, which can effectively remove the debris accumulated on the filter net and maintain a good filtering effect. This helps to improve the water circulation efficiency, reduce the interference with the heat exchange process, and also reduce the wear of the water pump and heat exchanger by the debris, extend the service life of the equipment, and reduce the maintenance cost. At the same time, the filter plate can be replaced without affecting the normal operation of the system, avoiding production losses and time waste caused by downtime.

[0034] 3. The scraper frame, support rod and top box in the present invention are connected and use a movable plate as a switch to achieve intermittent connection. When the gap is connected, reciprocating up and down driving is achieved to clean the liquid outlet holes on the vertical rod; the stability of the liquid outlet is ensured, and dynamic or static cleaning of scale in the heat exchange cylinder is achieved, which has the advantage of centralized cleaning without disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0036] Figure 2 It is a front view cross-sectional structural schematic diagram of the present invention;

[0037] Figure 3 for Figure 2 A magnified view of part A;

[0038] Figure 4 A schematic top view of the cleaning sleeve of the present invention;

[0039] Figure 5 It is a structural schematic diagram of the filter assembly in the left cross-sectional view of the present invention;

[0040] Figure 6 It is a partial cross-sectional view of the heat exchange tube in the present invention;

[0041] Figure 7 It is a schematic diagram of the connection between the bottom plate and the slag pusher plate of the present invention;

[0042] Figure 8 It is a partial cross-sectional view of the heat source water tank of the present invention;

[0043] Fig. 9 Detailed structural diagram of the filter plate in the present invention;

[0044] Fig.10 for Figure 5 Enlarged view of part B.

[0045] In the figure:

[0046] 1. Heat source water tank; 11. Heat source water inlet; 12. Heat source water return outlet; 13. Transmission compartment; 14. First placement tank; 15. First sewage outlet; 16. User water inlet; 17. User water return outlet;

[0047] 2. User water tank; 3. Hot water exchange tank; 4. Water pipe;

[0048] 5. Cleaning assembly; 51. Top box; 52. Built-in long rod; 53. Movable plate; 54. Cleaning sleeve; 55. Brush head; 56. Sliding plate; 57. Electric push rod;

[0049] 6. Filter assembly; 61. Support frame; 62. Filter plate; 63. Slider 1; 64. Telescopic slot; 65. First slot;

[0050] 7. Fixing assembly; 71. Knob; 72. Threaded rod; 73. Threaded tube; 74. Push block; 75. First limiting rod; 76. Transverse spring; 77. Slider 2;

[0051] 8. heat exchange cylinder; 81. support rod; 82. scraper rod frame; 83. bottom plate; 84. second placement slot; 86. second sewage outlet; 87. electromagnetic valve; 88. slag pusher plate; 821. liquid outlet; 822. upper inclined plate; 823. lateral scraper; 824. vertical rod; 825. bottom plate; 811. sliding slot;

[0052] 11. Electromagnet. DETAILED DESCRIPTION

[0053] The following will be combined with the 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, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] Example 1

[0055] like Figure 1-4As shown, an implementation scheme of the present invention is a heat exchanger group used in a thermal power plant, including a heat source water tank 1, wherein the heat source water tank 1 is suitable for storing hot water; a user water tank 2, wherein the user water tank 2 is used to supply users and is filled with cold water; the heat source water tank and the user water tank may include independent heat source water inlet pipes and heat source water outlet pipes, which are connected to different sources by branch pipes to achieve stable hot water filling in the heat source water tank.

[0056] A heat exchange water tank 3, wherein a heat exchange cylinder 8 is installed in the middle of the heat exchange water tank 3, and is connected to the heat source water tank 1 and the user water tank 2 on both sides by installing water pipes 4; a filter assembly 6, wherein the filter assembly 6 is installed in the heat exchange water tank 3; the heat exchange cylinder 8 comprises a cylindrical shell, wherein the upper and lower ends of the cylindrical shell are fixedly connected to the inner wall of the heat exchange water tank 3; a support rod 81 is installed in the cylindrical shell; a scraper rod frame 82 is installed on the support rod 81, and the scraper rod frame 82 and the support rod 81 are both provided with built-in cavities and are connected; The scraper frame 82 is provided with liquid outlet holes 821, which are distributed on both sides of the scraper frame 82 surface; the bottom of the heat exchange cylinder is provided with a bottom plate 83, and the bottom plate 83 is provided with a second sewage outlet 86; the upper end of the support rod 81 is connected to the heat exchange water tank 3 through a connecting bearing, and the lower end is connected to the bottom plate 83 through a connecting bearing; the bottom side of the heat exchange water tank 3 is provided with a first sewage outlet 15, and the size of the first sewage outlet 15 is larger than the size of the second sewage outlet 86; the second sewage outlet 86 is installed with an electromagnetic valve 87;

[0057] The cleaning assembly 5 includes a top box 51, the bottom of which is connected to the inner cavity of the support rod 81; and a cleaning member is installed in the support rod 81, and the cleaning member is suitable for driving the liquid outlet 821 of the cleaning scraper frame 82. Figure 2 and Figure 3 As shown, the scraper frame 82 includes an upper inclined plate 822, a side scraper 823, a vertical rod 824 and a bottom plate 825. The upper inclined plate 822 is inclined downward, and the bottom is connected to the top of the vertical rod 824; the vertical rod 824 is provided with multiple groups, and liquid outlet holes 821 are provided on both sides of the vertical rod 824; the bottom of the vertical rod 824 is connected to the bottom plate 825; the upper and lower ends of the side scraper 823 are respectively connected to the ends of the upper inclined plate 822 and the bottom plate 825, and are suitable for friction with the inner wall of the heat exchange cylinder;

[0058] Slag pushing plates 88 are disposed on both sides of the bottom plate 825 , and the slag pushing plates 88 are disposed in an arc shape with the arc center disposed downward.

[0059] The cleaning member includes a built-in long rod 52, a step opening is provided at the bottom of the top box 51, and a movable plate 53 is movably connected in the step opening, and the movable plate 53 is movably connected in the step opening and is suitable for opening and closing the top box 51 and the built-in cavity of the support rod 81;

[0060] The outer side of the vertical rod 824 is sleeved with a cleaning sleeve 54 , and the end of the cleaning sleeve 54 extends into the built-in cavity of the support rod 81 and is connected to the built-in long rod 52 .

[0061] A sliding hole is provided in the cleaning sleeve 54, and a brush head 55 is arranged in the sliding hole, and the brush head 55 is suitable for cleaning the liquid outlet hole 821; a filter is installed in the liquid outlet hole 821, and the filter is connected to the scraper frame 82; a connecting part is provided at the end of the cleaning sleeve 54, and sliding plates 56 are installed at the upper and lower ends of the connecting part, a sliding groove 811 is provided in the support rod 81, and the sliding plate 56 is suitable for sliding in the sliding groove 811.

[0062] The heat exchange water tank 3 is respectively provided with a heat source water inlet 11, a heat source water return port 12, a user water inlet 16 and a user water return port 17 on both sides, and the heat source water inlet 11 and the heat source water return port 12 are located on the same side, and the user water inlet 16 and the user water return port 17 are located on the same side; the heat source water tank 1 is respectively connected with the heat source water inlet 11 and the heat source water return port 12 through the water pipe 4; the user water tank 2 is respectively connected with the user water inlet 16 and the user water return port 17 through the water pipe 4.

[0063] The scraper frame, support rod and top box in the present invention are connected and use a movable plate as a switch to achieve intermittent connection. When the gap is connected, reciprocating up and down driving is achieved to clean the liquid outlet hole on the vertical rod; the stability of the liquid outlet is ensured, and dynamic or static cleaning of scale in the heat exchange cylinder is achieved, which has the advantages of centralized cleaning and no need for disassembly.

[0064] Example 2

[0065] like Figure 5-10 As shown, it is another embodiment of the present invention. On the basis of Example 1, the filter assembly 6 includes a support frame 61 fixed to the inner wall of the hot water exchange tank 3 and a filter plate 62 clamped on the surface of the support frame 61. The filter assembly 6 is fixed inside the hot water exchange tank 3 by a fixing assembly 7;

[0066] like Fig. 9 As shown, a slider 63 is fixed to the lower surface of the filter plate 62, a first slide groove is provided on the surface of the support frame 61, and the slider 63 moves in the first slide groove. The slider 63 and the first slide groove of the filter plate 62 move on the surface of the support frame 61. There are two sliders 63 and two first slide grooves, which are symmetrically arranged on the lower surface of the filter plate 62. A movable groove corresponding to the filter plate 62 is provided on the surface of the processing box 1, and the movable groove is "H" shaped.

[0067] like Figure 6As shown, a second placement groove 84 is opened inside the heat exchange tube 8, and a first placement groove 14 is opened on the surface of the water exchange water tank 3. The first placement groove 14 is connected to the second placement groove 84. An electromagnet 11 is installed inside the second placement groove 84. The electromagnet 11 is "U"-shaped, and the N and S poles of the electromagnet 11 are gradually flipped. The material of the side scraper 823 is magnet.

[0068] It also includes a fixing component 7, which includes a knob 71 arranged on the surface of the processing box 1, a transmission bin 13 is opened inside the processing box 1, a threaded rod 72 is fixed to the lower end of the knob 71, the lower end of the threaded rod 72 is rotatably passed through the transmission bin 13, a threaded tube 73 is threadedly connected to the surface of the threaded rod 72, a push block 74 is fixed to the lower end of the threaded tube 73, a telescopic slot 64 is opened on the surface of the support frame 61, the telescopic slot 64 is connected to the transmission bin 13, a first limit rod 75 is arranged below the push block 74, and the first limit rod 75 is arranged in the telescopic slot 64.

[0069] like Fig.10 As shown, a first slot 65 is provided on the surface of the filter plate 62, one end of the first limiting rod 75 is clamped in the first slot 65, the first limiting rod 75 and the pushing block 74 are perpendicular to each other, a transverse spring 76 is also sleeved on the surface of the first limiting rod 75, a second slider 77 is fixed to the side of the threaded tube 73, a second slide groove is provided on the surface of the transmission bin 13, the second slider 77 moves in the second slide groove, the threaded tube 73 moves in the transmission bin 13 through the knob 71, the threaded rod 72, the second slider 77 and the second slide groove, there are two of the second slider 77 and the second slide groove, and they are symmetrically arranged on both sides of the threaded tube 73.

[0070] A method for cleaning a heat exchanger group in a thermal power plant comprises the following steps:

[0071] A. Stop the connection between the heat source water tank 1 and the user water tank 2 and the water pipe 4 of the heat exchange water tank 3, open the top tank 51, and fill the top tank 51 with a cleaning agent for removing dirt; fill the heat exchange water tank 3 with more than 8% of mixed water;

[0072] B. An electric push rod 57 is installed on the top of the top box 51, and the output end extends into the top box 51 and is connected to the built-in long rod 52; after adding the cleaning agent, open the electric push rod 57;

[0073] The electric push rod 57 drives the built-in long rod 52 upward, and the movable plate 53 opens, so that the cleaning agent enters the support rod 81; the cleaning agent is filled in the built-in cavity of the support rod 81, and flows into the scraper frame 82, and flows out through the liquid outlet 821;

[0074] C. The electric push rod 57 is driven up and down reciprocatingly, driving the cleaning sleeve 54 at the bottom end of the built-in long rod 52 to move up and down along the vertical rod 824, so that the cleaning sleeve 54 cleans multiple groups of liquid outlet holes 821;

[0075] D. By controlling the N and S poles of the electromagnet 11, the side scraper 823 is attracted to each other, driving the side scraper 823 to rotate. When the side scraper 823 rotates to the side of the electromagnet 11, the magnetic poles of the electromagnet 11 are adjusted to make it repel each other with the side scraper 823, thereby pushing the side scraper 823 to rotate, thereby realizing the circular motion of the side scraper 823, and then scraping the inner wall of the heat exchange cylinder 8. At the same time, the scraped scale falls on the bottom plate 83, and the bottom plate 83 does not rotate with the support rod 81, but rotates with the push plate 88 to go around in a circle and enter the first sewage outlet and the second sewage outlet;

[0076] E. Repeat steps AD to ensure the cleaning effect; then open the electromagnetic valve 87 to discharge the cleaned scale sewage; fill with hot water for flushing, then detect the residual concentration, and after meeting the standard, the cleaning is completed.

[0077] The present invention controls the magnetic poles of the electromagnet so that the scraper frame can scrape the inner wall of the heat exchange tube, and the slag pushing plate at the bottom can push the scale dropped on the bottom plate into the second sewage outlet. When the first sewage outlet is connected to the second sewage outlet, the scale falls into the electromagnetic valve, thereby realizing centralized cleaning of the scale, reducing the workload of the staff and improving the efficiency of the heat exchange device. At the same time, the electromagnet can construct a magnetic field in the heat exchange tube, so that the impurities in the heat exchange tube are charged, and finally the potential is generated to become a polar substance, which can further prevent the calcium and magnesium ions in the water from adhering to the inner wall of the heat exchange tube to generate scale.

[0078] The filter assembly of the present invention can replace the filter plate during the circulation heat exchange process, effectively remove the debris accumulated on the filter net, and maintain a good filtering effect. This helps to improve the water circulation efficiency, reduce the interference with the heat exchange process, and also reduce the wear of the debris on the water pump and the heat exchanger, extend the service life of the equipment, and reduce the maintenance cost. At the same time, the filter plate can be replaced without affecting the normal operation of the system, avoiding production losses and time waste caused by downtime.

[0079] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A heat exchanger group used in a thermal power plant, characterized in that: include: A heat source water tank (1), wherein the heat source water tank (1) is suitable for storing hot water; A user water tank (2), the user water tank (2) is used to supply water to users and is filled with cold water; A heat exchange water tank (3), wherein a heat exchange cylinder (8) is installed in the middle of the heat exchange water tank (3), and is connected to the heat source water tank (1) and the user water tank (2) on both sides respectively through the installation of water pipes (4); A filter assembly (6), the filter assembly (6) is installed in the water exchange tank (3); The heat exchange tube (8) comprises a cylindrical shell, the upper and lower ends of which are fixedly connected to the inner wall of the heat exchange water tank (3); a support rod (81) is installed in the cylindrical shell; a scraper frame (82) is installed on the support rod (81), and the scraper frame (82) and the support rod (81) are both provided with built-in cavities and are connected; the scraper frame (82) is provided with liquid outlet holes (821) distributed on both sides of the surface of the scraper frame (82); the bottom of the heat exchange tube is provided with A bottom plate (83) is provided, and a second sewage outlet (86) is provided on the bottom plate (83); the upper end of the support rod (81) is connected to the heat exchange water tank (3) through a connecting bearing, and the lower end is connected to the bottom plate (83) through a connecting bearing; a first sewage outlet (15) is provided on the inner bottom side of the heat exchange water tank (3), and the size of the first sewage outlet (15) is larger than the size of the second sewage outlet (86); an electromagnetic valve (87) is installed at the second sewage outlet (86); A cleaning assembly (5), the cleaning assembly (5) comprising a top box (51), the bottom of the top box (51) being in communication with the built-in cavity of the support rod (81); and a cleaning piece being installed in the support rod (81), the cleaning piece being suitable for driving the liquid outlet hole (821) of the cleaning scraper frame (82).

2. A heat exchange box group for use in a thermal power plant according to claim 1, characterized in that: The scraper frame (82) comprises an upper inclined plate (822), a side scraper (823), a vertical rod (824) and a bottom plate (825); the upper inclined plate (822) is inclined downward, and the bottom is connected to the top of the vertical rod (824); the vertical rod (824) is provided with multiple groups, and liquid outlet holes (821) are provided on both sides of the vertical rod (824); the bottom of the vertical rod (824) is connected to the bottom plate (825); the upper and lower ends of the side scraper (823) are respectively connected to the ends of the upper inclined plate (822) and the bottom plate (825), and are suitable for friction with the inner wall of the heat exchange cylinder; Slag pushing plates (88) are arranged on both sides of the bottom plate (825), and the slag pushing plates (88) are arranged in an arc shape with the arc center arranged downward.

3. The heat exchange box group used in a thermal power plant according to claim 1, characterized in that: The cleaning member comprises a built-in long rod (52), the bottom of the top box (51) is provided with a stepped opening, and a movable plate (53) is movably connected in the stepped opening, and the movable plate (53) is movably connected in the stepped opening and is suitable for opening and closing the built-in cavity of the top box (51) and the support rod (81); A cleaning sleeve (54) is sleeved on the outer side of the vertical rod (824), and the end of the cleaning sleeve (54) extends into the built-in cavity of the support rod (81) and is connected to the built-in long rod (52).

4. The heat exchange box group used in a thermal power plant according to claim 1, characterized in that: A sliding hole is provided in the cleaning sleeve (54), and a brush head (55) is arranged in the sliding hole, and the brush head (55) is suitable for cleaning the liquid outlet hole (821); a filter screen is installed in the liquid outlet hole (821), and the filter screen is connected to the scraper frame (82); a connecting part is provided at the end of the cleaning sleeve (54), and sliding plates (56) are installed at the upper and lower ends of the connecting part; a sliding groove (811) is provided in the support rod (81), and the sliding plate (56) is suitable for sliding in the sliding groove (811).

5. A heat exchange box group for use in a thermal power plant according to claim 4, characterized in that: The filter assembly (6) comprises a support frame (61) fixed to the inner wall of the water exchange tank (3) and a filter plate (62) clamped on the surface of the support frame (61); the filter assembly (6) is fixed inside the water exchange tank (3) via a fixing assembly (7); A slider 1 (63) is fixed on the lower surface of the filter plate (62); a first slide groove is provided on the surface of the support frame (61); the slider 1 (63) moves in the first slide groove; the slider 1 (63) of the filter plate (62) and the first slide groove move on the surface of the support frame (61); there are two sliders 1 (63) and two first slide grooves, which are symmetrically arranged on the lower surface of the filter plate (62); a movable groove corresponding to the filter plate (62) is provided on the surface of the processing box (1), and the movable groove is "H" shaped.

6. The heat exchange box group used in a thermal power plant according to claim 5, characterized in that: A second placement groove (84) is provided inside the heat exchange tube (8), a first placement groove (14) is provided on the surface of the heat exchange water tank (3), the first placement groove (14) is connected to the second placement groove (84), an electromagnet (11) is installed inside the second placement groove (84), the electromagnet (11) is "U"-shaped, the N and S poles of the electromagnet (11) are gradually turned over, and the material of the lateral scraper (823) is a magnet.

7. The heat exchange box group used in a thermal power plant according to claim 1, characterized in that: The invention also comprises a fixing assembly (7), wherein the fixing assembly (7) comprises a knob (71) arranged on the surface of the processing box (1), a transmission bin (13) is provided inside the processing box (1), a threaded rod (72) is fixed at the lower end of the knob (71), the lower end of the threaded rod (72) is rotatably inserted into the transmission bin (13), a threaded tube (73) is threadedly connected to the surface of the threaded rod (72), a pushing block (74) is fixed at the lower end of the threaded tube (73), a telescopic groove (64) is provided on the surface of the support frame (61), the telescopic groove (64) is connected to the transmission bin (13), a first limiting rod (75) is provided below the pushing block (74), and the first limiting rod (75) is provided in the telescopic groove (64).

8. The heat exchange box group used in a thermal power plant according to claim 4, characterized in that: The filter plate (62) is provided with a first slot (65) on its surface, one end of the first limiting rod (75) is clamped in the first slot (65), the first limiting rod (75) and the pushing block (74) are perpendicular to each other, the surface of the first limiting rod (75) is also sleeved with a transverse spring (76), a second slide block (77) is fixed to the side of the threaded tube (73), a second slide block (77) is provided on the surface of the transmission bin (13), the second slide block (77) moves in the second slide block, the threaded tube (73) moves in the transmission bin (13) through the knob (71), the threaded rod (72), the second slide block (77) and the second slide block, there are two of the second slide block (77) and the second slide block, and they are symmetrically arranged on both sides of the threaded tube (73).

9. The heat exchange box group used in a thermal power plant according to claim 1, characterized in that: The heat exchange water tank (3) is provided with a heat source water inlet (11), a heat source water return port (12), a user water inlet (16) and a user water return port (17) on both sides, and the heat source water inlet (11) and the heat source water return port (12) are located on the same side, and the user water inlet (16) and the user water return port (17) are located on the same side; the heat source water tank (1) is connected to the heat source water inlet (11) and the heat source water return port (12) through a water pipe (4); and the user water tank (2) is connected to the user water inlet (16) and the user water return port (17) through a water pipe (4).

10. A method for cleaning a heat exchanger group in a thermal power plant according to claim 9, characterized in that: The following steps are involved: A. Suspend the connection between the heat source water tank (1) and the user water tank (2) and the water pipe (4) of the heat exchange water tank (3), open the top box (51), and fill the top box (51) with a cleaning agent for removing dirt; fill the heat exchange water tank (3) with more than 8% of the remaining mixed water; B. An electric push rod (57) is installed on the top of the top box (51), and the output end extends into the top box (51) and is connected to the built-in long rod (52); after adding the cleaning agent, the electric push rod (57) is opened; The electric push rod (57) drives the built-in long rod (52) upward, and the movable plate (53) opens, so that the cleaning agent enters the support rod (81); the cleaning agent is filled in the built-in cavity of the support rod (81), flows into the scraper frame (82), and flows out through the liquid outlet (821); C. The electric push rod (57) is driven up and down reciprocatingly, driving the cleaning sleeve (54) at the bottom end of the built-in long rod (52) to move up and down along the vertical rod (824), so that the cleaning sleeve (54) cleans multiple groups of liquid outlet holes (821); D. By controlling the N and S poles of the electromagnet (11), the side scraper (823) is attracted to each other, and the side scraper (823) is driven to rotate. When the side scraper (823) rotates to the side of the electromagnet (11), the magnetic pole of the electromagnet (11) is adjusted so that the side scraper (823) and the side scraper (823) are repelled by the same pole, and the side scraper (823) is driven to rotate, thereby realizing the circular motion of the side scraper (823), and then scraping the inner wall of the heat exchange cylinder (8). At the same time, the scraped scale falls on the bottom plate (83) (83), and the bottom plate (83) (83) does not rotate with the support rod (81), but is pushed by the slag pushing plate (88) to circle and enter the first sewage outlet and the second sewage outlet; E. Repeat steps AD to ensure the cleaning effect; then open the electromagnetic valve (87) to discharge the cleaned scale sewage; fill with hot water for flushing, then detect the residual concentration, and after the standard is met, the cleaning is completed.

Images