Slag flushing water impurity interception device and waste heat efficiency improvement method

Abstract

The present application belongs to the technical field of blast furnace smelting, and discloses a slag flushing water impurity interception device and a waste heat efficiency improving method. The present application proposes the following scheme to solve the problems in the background technology, including a heat exchange tube shell, one end of the outer wall of the heat exchange tube shell is fixed with a first sealing pipe head through bolts, and the axis of the first sealing pipe head is connected with a water inlet pipe, the other end of the outer wall of the heat exchange tube shell is fixed with a second sealing pipe head through bolts, and the axis of the second sealing pipe head is connected with a drain pipe, one side of the inner wall of the heat exchange tube shell is connected with a liquid discharge pipe, and the other side of the inner wall of the heat exchange tube shell is connected with a liquid inlet pipe. The present application can realize uninterrupted filtration and cleaning by using a servo motor to drive the interception pipe to rotate continuously, thereby maintaining the normal operation of the interception device to the greatest extent, and the elastic cooperation of the impact of the telescopic cylinder and the compression spring can quickly vibrate and separate the particles that block the circular filter screen, thereby realizing self-cleaning treatment.

Description

Technical Field

[0001] This invention relates to the field of blast furnace smelting technology, and in particular to a device for intercepting impurities in slag flushing water and a method for improving waste heat efficiency. Background Technology

[0002] Blast furnace slag flushing water refers to the water injected into the blast furnace during the smelting process to control the temperature and slag flowability. Because this water comes into direct contact with the high-temperature slag, its composition becomes very complex. According to search results, the main components of blast furnace slag flushing water include silica, calcium oxide, aluminum oxide, magnesium oxide, and a small amount of iron oxide. In addition, blast furnace slag flushing water also contains a large amount of sulfate and chloride ions.

[0003] The presence of these components makes the properties of blast furnace slag flushing water very unique. For example, its pH value may be alkaline, and it may contain substances harmful to human health, such as phenols and cyanides. Therefore, in actual operation, these wastewaters need to be strictly treated and monitored to ensure that they do not have adverse effects on the environment and human health. Because blast furnace slag flushing water is in direct contact with the high temperatures inside the furnace, its temperature is relatively high. To improve energy utilization, heat exchange treatment of the slag flushing water is necessary. However, existing blast furnace slag flushing water heat exchangers still have some problems in use: Heat exchangers are prone to clogging. During the heat exchange process of existing blast furnace slag flushing water, a large number of solid particles are mixed in the flushing water. These solid particles enter the heat exchanger and easily clog the pores inside the heat exchanger. Over time, this can easily lead to blockage inside the heat exchanger, reducing heat exchange efficiency and even causing the heat exchanger to malfunction.

[0004] Poor heat exchange efficiency. Existing blast furnace slag flushing water heat exchangers have simple internal heat exchange structures, resulting in a small contact area for heat exchange components and a short heat exchange time, thus leading to poor overall heat exchange efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for intercepting impurities in flushing water and a method for improving waste heat efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A slag flushing water impurity interception device includes a heat exchange tube shell. A first sealing tube head is fixed to the outer wall of one end of the heat exchange tube shell by bolts, and a water inlet pipe is connected to the axis of the first sealing tube head. A second sealing tube head is fixed to the outer wall of the other end of the heat exchange tube shell by bolts, and a drain pipe is connected to the axis of the second sealing tube head. A liquid drain pipe is connected to one inner wall of the heat exchange tube shell, and a liquid inlet pipe is connected to the other inner wall of the heat exchange tube shell. An interception component is provided at the end of the liquid inlet pipe. The interception assembly includes an arc-shaped slag-blocking shell connected to the outer wall of the inlet pipe, and a connecting pipe connected to the inner wall of the other side of the arc-shaped slag-blocking shell. A mounting bracket is welded to the top outer wall of the inlet pipe, and a servo motor is fixed to the mounting bracket by bolts. An octagonal column is fixed to the output shaft of the servo motor, and a connecting rod is rotatably connected to each of the eight outer walls of the octagonal column. An interception pipe is welded to the outer wall of the connecting rod away from the octagonal column, and a circular filter screen is adhered to the inner wall of the interception pipe. An L-shaped fixing plate is welded to the outer wall of one end of the octagonal column, and a telescopic cylinder is fixed to the mounting bracket by screws. Both ends of the heat exchange tube shell are provided with annular positioning grooves, and the inner wall of the annular positioning groove is provided with a circular sealing plate. A spiral guide plate is inserted into the inner wall of the heat exchange tube shell, and the outer wall of the spiral guide plate is provided with equally spaced circular through holes. The spiral guide plate is provided with equally spaced spiral heat exchange tubes inside. A first magnet is fixed to the outer wall of the L-shaped fixing plate near the connecting rod, and a second magnet is fixed to the outer wall of the connecting rod near the L-shaped fixing plate. The first magnet and the second magnet have opposite magnetic properties. The outer wall of the other side of the octagonal column is welded with equally spaced diagonal bracing plates, and a compression spring is welded to the outer wall of the end of the diagonal bracing plates along the inclined direction. The diagonal bracing plates, compression springs and connecting rod are located in the same vertical plane. A temperature sensor is installed on the inner wall of the drain pipe, and electric heating wires are installed in a ring at equal intervals on the inner wall of the first sealing pipe head.

[0007] Preferably, the axis of the liquid inlet pipe and the axis of the connecting pipe are on the same straight line, and the top outer wall of the arc-shaped slag barrier shell is welded with symmetrically distributed arc-shaped overflow baffles.

[0008] Preferably, the height of the intercepting pipe is adapted to the width of the inner wall of the arc-shaped slag-blocking shell, and the radius of the intercepting pipe is adapted to the radius of the liquid inlet pipe.

[0009] Preferably, a rectangular sealing shell is connected to the outer wall of the top side of the connecting pipe, and an intercepting mesh plate is slidably inserted into the inner wall of the rectangular sealing shell, and a lifting handle is welded to the top outer wall of the intercepting mesh plate.

[0010] Preferably, the outer wall of the connecting pipe is fixed with an arc-shaped clamp by bolts, and a collection frame is welded to the top outer wall of the arc-shaped clamp.

[0011] Preferably, the servo motor, telescopic cylinder, temperature sensor, and electric heating wire are all connected to a PLC controller via signal lines, and the PLC controller is connected to an external power supply via wires.

[0012] A method for improving the efficiency of waste heat from slag flushing water includes the following steps: S1: First, assemble the impurity interception device and connect it to an external power source. After the power supply is complete, test run the impurity interception device. Once it is running normally, connect the connecting pipe to the external slag flushing water pipe. S2: After the connection is completed, the servo motor drives the intercepting tube to rotate. When the bottom intercepting tube slides into the inner wall of the arc-shaped slag-blocking shell and the axis of the intercepting tube is aligned with the axis of the connecting pipe, the circular filter screen will filter the slag-flush water and intercept the solid impurities inside the slag-flush water, thus completing a single filtration. S3: When the flushing water after the first filtration passes through the intercepting screen plate at the back, it will undergo a second filtration process to intercept solid particle impurities inside the flushing water. When the circular filter screen intercepts too many impurities and the mesh becomes clogged, the PLC controller controls the servo motor to drive it to rotate a certain angle. After the intercepting tube is rotated out, the telescopic cylinder is activated to impact the connecting rod. After the connecting rod hits the compression spring and vibrates, it will shake out the impurity particles inside the intercepting tube and collect them in the collection frame. S4: After the slag flushing water after double filtration enters the heat exchange tube shell, the spiral guide plate set inside the heat exchange tube shell will greatly increase the flow path of the high temperature slag flushing water. At this time, the cold water that needs to be heat exchanged enters the first sealed tube head from the water inlet pipe, passes through the spiral heat exchange tube and flows in the opposite direction to the high temperature slag flushing water, thereby completing the heat exchange and making efficient use of the waste heat of the slag flushing water. S5: After the hot water is discharged from the drain pipe after heat exchange, the temperature sensor will detect the water temperature. If the temperature is not high enough for reuse, the electric heating wire will be activated to reheat the hot water before it is discharged for reuse.

[0013] The beneficial effects of this invention are as follows: 1. The flushing water impurity interception device designed in this paper can effectively intercept and treat the particles inside the flushing water by setting an interception device at the inlet end of the flushing water and using a dual interception filtration method, thereby effectively extending the service life of the heat exchanger. In addition, the heat exchange tube shell is removable, which facilitates disassembly, cleaning and maintenance in the later stage. 2. The slag flushing water impurity interception device designed in this paper uses a servo motor to drive the interception tube to rotate continuously, thereby achieving uninterrupted filtration and cleaning, maintaining the normal operation of the interception device to the greatest extent, and using the impact of the telescopic cylinder and the elasticity of the compression spring to quickly vibrate and separate the particles that clog the circular filter screen, thus achieving self-cleaning. 3. The slag flushing water impurity interception device in this design allows the high-temperature slag flushing water to pass through the spiral guide plate during the heat exchange process, which can effectively extend the flow path and thus increase the heat exchange time. Furthermore, the cold water passing through the inside of the spiral heat exchange tube can not only extend the cold water flow heat exchange time but also greatly increase the contact area, thereby effectively improving the waste heat exchange efficiency. Combined with the feedback from the temperature sensor and the auxiliary heating of the electric heating wire, the loss of excess heat energy can be minimized, and the energy utilization can be maximized. Attached Figure Description

[0014] Figure 1 This is a front view of the overall structure of a slag flushing water impurity interception device proposed in this invention; Figure 2 This is a side view of the overall structure of a slag flushing water impurity interception device proposed in this invention; Figure 3 This is a schematic diagram of the internal disassembly structure of a slag flushing water impurity interception device proposed in this invention; Figure 4 This is a top view of the internal structure of a slag flushing water impurity interception device proposed in this invention; Figure 5 This is a schematic diagram of the spiral guide plate structure of a slag flushing water impurity interception device proposed in this invention; Figure 6 This is a schematic diagram of the interception component structure of a slag flushing water impurity interception device proposed in this invention; Figure 7 This is a side view of the interception component structure of a slag flushing water impurity interception device proposed in this invention.

[0015] In the diagram: 1. Heat exchanger tube shell; 2. Drain pipe; 3. Inlet pipe; 4. Arc-shaped slag trap shell; 5. Connecting pipe; 6. Arc-shaped overflow baffle; 7. Mounting bracket; 8. Servo motor; 9. Octagonal column base; 10. Connecting rod; 11. Interception pipe; 12. Circular filter screen; 13. L-shaped fixing plate; 14. First magnet; 15. Second magnet; 16. Telescopic cylinder; 17. Diagonal brace plate; 18. Compression spring; 19. Rectangular sealing shell; 20. Interception mesh plate; 21. Lifting handle; 22. Annular positioning groove; 23. Circular sealing plate; 24. Spiral heat exchanger tube; 25. Spiral guide plate; 26. Circular through hole; 27. First sealing tube head; 28. Inlet pipe; 29. ​​Second sealing tube head; 30. Drain pipe; 31. Temperature sensor; 32. Electric heating wire; 33. Arc-shaped clamp; 34. Collection frame. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] Example 1, referring to Figure 1-7 A device for intercepting impurities in flushing water and a method for improving waste heat efficiency include a heat exchange tube shell 1. A first sealing pipe head 27 is fixed to the outer wall of one end of the heat exchange tube shell 1 by bolts, and a water inlet pipe 28 is connected to the axis of the first sealing pipe head 27. A second sealing pipe head 29 is fixed to the outer wall of the other end of the heat exchange tube shell 1 by bolts, and a drain pipe 30 is connected to the axis of the second sealing pipe head 29. The axis of the liquid inlet pipe 3 and the axis of the connecting pipe 5 are on the same straight line. Symmetrically distributed arc-shaped overflow baffles 6 are welded to the top outer wall of the arc-shaped slag interception shell 4. One side of the heat exchange tube shell 1 is connected to a drain pipe 2, and the other side of the heat exchange tube shell 1 is connected to an inlet pipe 3. An interception component is provided at the end of the inlet pipe 3. The height of the interception pipe 11 is adapted to the width of the inner wall of the arc-shaped slag-blocking shell 4, and the radius of the interception pipe 11 is adapted to the radius of the inlet pipe 3. A rectangular sealing shell 19 is connected to the top side of the connecting pipe 5, and an interception mesh plate 20 is slidably inserted into the inner wall of the rectangular sealing shell 19. A lifting handle 21 is welded to the top outer wall of the interception mesh plate 20. The interception assembly includes an arc-shaped slag-blocking shell 4 connected to the outer wall of the liquid inlet pipe 3, and a connecting pipe 5 connected to the inner wall of the other side of the arc-shaped slag-blocking shell 4. A mounting bracket 7 is welded to the top outer wall of the liquid inlet pipe 3, and a servo motor 8 is fixed to the mounting bracket 7 by bolts. An octagonal column 9 is fixed to the output shaft of the servo motor 8, and a connecting rod 10 is rotatably connected to each of the eight outer walls of the octagonal column 9. A first magnet 14 is fixed to the outer wall of the L-shaped fixing plate 13 near the connecting rod 10, and a second magnet 15 is fixed to the outer wall of the connecting rod 10 near the L-shaped fixing plate 13. By setting an interception device at the inlet end of the flushing water, the particles inside the flushing water can be effectively intercepted and treated using a dual interception filtration method, thereby effectively extending the service life of the heat exchanger. In addition, the heat exchange tube shell 1 is removable, which facilitates disassembly, cleaning and maintenance in the later stage. The first magnet 14 and the second magnet 15 have opposite magnetic properties. The connecting rod 10 is welded with an intercepting tube 11 on the outer wall away from the octagonal column 9, and the inner wall of the intercepting tube 11 is glued with a circular filter screen 12. One end of the outer wall of the octagonal column 9 is welded with L-shaped fixing plates 13 distributed at equal intervals, and a telescopic cylinder 16 is fixed on the mounting frame 7 by screws. The outer wall of the other side of the octagonal column 9 is welded with equally spaced diagonal bracing plates 17, and the outer wall of the end of the diagonal bracing plate 17 is welded with a compression spring 18 along the inclined direction. The diagonal bracing plate 17, the compression spring 18 and the connecting rod 10 are located in the same vertical plane. By using the servo motor 8 to drive the interceptor tube 11 to rotate continuously, uninterrupted filtration and cleaning can be achieved, maximizing the normal operation of the interceptor device. Furthermore, by utilizing the impact of the telescopic cylinder 16 and the elasticity of the compression spring 18, the particles clogged by the circular filter screen 12 can be quickly vibrated and separated, achieving self-cleaning. Both ends of the heat exchange tube shell 1 are provided with annular positioning grooves 22, and the inner wall of the annular positioning grooves 22 is provided with circular sealing plates 23. The servo motor 8, telescopic cylinder 16, temperature sensor 31 and electric heating wire 32 are all connected to a PLC controller through signal lines, and the PLC controller is connected to an external power supply through wires. A spiral guide plate 25 is inserted into the inner wall of the heat exchange tube shell 1, and the outer wall of the spiral guide plate 25 is provided with equally spaced circular through holes 26. The spiral heat exchange tubes 24 are provided inside the spiral guide plate 25. A temperature sensor 31 is installed on the inner wall of the drain pipe 30, and an equally spaced electric heating wires 32 are installed in a ring on the inner wall of the first sealing pipe head 27. An arc-shaped clamp 33 is fixed to the outer wall of the connecting pipe 5 by bolts, and a collection frame 34 is welded to the top outer wall of the arc-shaped clamp 33.

[0018] Example 2, refer to Figure 1-7 A device for intercepting impurities in flushing water and a method for improving waste heat efficiency include a heat exchange tube shell 1. A first sealing pipe head 27 is fixed to the outer wall of one end of the heat exchange tube shell 1 by bolts, and a water inlet pipe 28 is connected to the axis of the first sealing pipe head 27. A second sealing pipe head 29 is fixed to the outer wall of the other end of the heat exchange tube shell 1 by bolts, and a drain pipe 30 is connected to the axis of the second sealing pipe head 29. The axis of the liquid inlet pipe 3 and the axis of the connecting pipe 5 are on the same straight line. Symmetrically distributed arc-shaped overflow baffles 6 are welded to the top outer wall of the arc-shaped slag interception shell 4. One side of the heat exchange tube shell 1 is connected to a drain pipe 2, and the other side of the heat exchange tube shell 1 is connected to an inlet pipe 3. An interception component is provided at the end of the inlet pipe 3. The height of the interception pipe 11 is adapted to the width of the inner wall of the arc-shaped slag-blocking shell 4, and the radius of the interception pipe 11 is adapted to the radius of the inlet pipe 3. A rectangular sealing shell 19 is connected to the top side of the connecting pipe 5, and an interception mesh plate 20 is slidably inserted into the inner wall of the rectangular sealing shell 19. A lifting handle 21 is welded to the top outer wall of the interception mesh plate 20. The interception assembly includes an arc-shaped slag-blocking shell 4 connected to the outer wall of the liquid inlet pipe 3, and a connecting pipe 5 connected to the inner wall of the other side of the arc-shaped slag-blocking shell 4. A mounting bracket 7 is welded to the top outer wall of the liquid inlet pipe 3, and a servo motor 8 is fixed to the mounting bracket 7 by bolts. An octagonal column 9 is fixed to the output shaft of the servo motor 8, and a connecting rod 10 is rotatably connected to each of the eight outer walls of the octagonal column 9. A first magnet 14 is fixed to the outer wall of the L-shaped fixing plate 13 near the connecting rod 10, and a second magnet 15 is fixed to the outer wall of the connecting rod 10 near the L-shaped fixing plate 13. The first magnet 14 and the second magnet 15 have opposite magnetic properties. The connecting rod 10 is welded with an intercepting tube 11 on the outer wall away from the octagonal column 9, and the inner wall of the intercepting tube 11 is glued with a circular filter screen 12. One end of the outer wall of the octagonal column 9 is welded with L-shaped fixing plates 13 distributed at equal intervals, and a telescopic cylinder 16 is fixed on the mounting frame 7 by screws. The outer wall of the other side of the octagonal column 9 is welded with equally spaced diagonal bracing plates 17, and the outer wall of the end of the diagonal bracing plate 17 is welded with a compression spring 18 along the inclined direction. The diagonal bracing plate 17, the compression spring 18 and the connecting rod 10 are located in the same vertical plane. During the heat exchange process, allowing the high-temperature flushing water to pass through the spiral guide plate 25 can effectively extend the flow path, thereby increasing the heat exchange time. Furthermore, allowing the cold water to pass through the inside of the spiral heat exchange tube 24 can not only extend the cold water flow heat exchange time but also greatly increase the contact area, thereby effectively improving the waste heat exchange efficiency. Combined with the feedback from the temperature sensor 31 and the auxiliary heating from the electric heating wire 32, the loss of excess heat energy can be minimized, maximizing energy utilization. Both ends of the heat exchange tube shell 1 are provided with annular positioning grooves 22, and the inner wall of the annular positioning grooves 22 is provided with circular sealing plates 23. The servo motor 8, telescopic cylinder 16, temperature sensor 31 and electric heating wire 32 are all connected to a PLC controller through signal lines, and the PLC controller is connected to an external power supply through wires. A spiral guide plate 25 is inserted into the inner wall of the heat exchange tube shell 1, and the outer wall of the spiral guide plate 25 is provided with equally spaced circular through holes 26. The spiral heat exchange tubes 24 are provided inside the spiral guide plate 25. A temperature sensor 31 is installed on the inner wall of the drain pipe 30, and an equally spaced electric heating wires 32 are installed in a ring on the inner wall of the first sealing pipe head 27. An arc-shaped clamp 33 is fixed to the outer wall of the connecting pipe 5 by bolts, and a collection frame 34 is welded to the top outer wall of the arc-shaped clamp 33.

[0019] A method for improving the efficiency of waste heat from slag flushing water includes the following steps: S1: First, assemble the impurity interception device and connect it to an external power source. After the power supply is complete, test run the impurity interception device. Once it is running normally, connect the connecting pipe 5 to the external slag flushing water pipe. S2: After the connection is completed, the servo motor 8 drives the intercepting pipe 11 to rotate. When the bottom intercepting pipe 11 slides into the inner wall of the arc-shaped slag-blocking shell 4 and the axis of the intercepting pipe 11 is aligned with the axis of the connecting pipe 5, the circular filter screen 12 will filter the slag-flush water and intercept the solid impurities inside the slag-flush water, thereby completing a single filtration. S3: When the flushing water after the first filtration passes through the intercepting screen plate 20, it will undergo a second filtration process to intercept solid particle impurities inside the flushing water. When the circular filter screen 12 intercepts too many impurities and the mesh is clogged, the PLC controller controls the servo motor 8 to drive it to rotate a certain angle. After the intercepting tube 11 is rotated out, the telescopic cylinder 16 is activated to impact the connecting rod 10. After the connecting rod 10 hits the compression spring 18 and vibrates, it will shake out the impurity particles inside the intercepting tube 11 and collect them in the collection frame 34. S4: After the slag flushing water after double filtration enters the heat exchange tube shell 1, the spiral guide plate 25 set inside the heat exchange tube shell 1 will greatly increase the flow path of the high temperature slag flushing water. At this time, the cold water that needs to be heat exchanged enters the first sealing tube head 27 from the water inlet pipe 28, passes through the spiral heat exchange tube 24 and flows in the opposite direction to the high temperature slag flushing water, thereby completing the heat exchange and making efficient use of the waste heat of the slag flushing water. S5: When the hot water after heat exchange is discharged from the drain pipe 30, the temperature sensor 31 will detect the water temperature. If the detected temperature is not high enough for reuse, the electric heating wire 32 will be activated to reheat the hot water before it is discharged for use. This can minimize the loss of electricity and ensure that the hot water after heat exchange meets the requirements of the next step, thus maximizing the use of energy.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for intercepting impurities in flushing water, comprising a heat exchange tube shell (1), characterized in that, One end of the heat exchange tube shell (1) is fixed with a first sealing tube head (27) by bolts, and the axial part of the first sealing tube head (27) is connected to a water inlet pipe (28). The other end of the heat exchange tube shell (1) is fixed with a second sealing tube head (29) by bolts, and the axial part of the second sealing tube head (29) is connected to a drain pipe (30). One side of the inner wall of the heat exchange tube shell (1) is connected to a drain pipe (2), and the other side of the inner wall of the heat exchange tube shell (1) is connected to a liquid inlet pipe (3). The end of the liquid inlet pipe (3) is provided with an interception component. The interception assembly includes an arc-shaped slag-blocking shell (4) connected to the outer wall of the inlet pipe (3), and a connecting pipe (5) connected to the inner wall of the other side of the arc-shaped slag-blocking shell (4). A mounting bracket (7) is welded to the top outer wall of the inlet pipe (3), and a servo motor (8) is fixed to the mounting bracket (7) by bolts. An octagonal column (9) is fixed to the output shaft of the servo motor (8), and a connecting rod (10) is rotatably connected to each of the eight outer walls of the octagonal column (9). An interception pipe (11) is welded to the outer wall of the connecting rod (10) away from the octagonal column (9), and a circular filter screen (12) is glued to the inner wall of the interception pipe (11). An L-shaped fixing plate (13) with equal spacing is welded to the outer wall of one end of the octagonal column (9), and a telescopic cylinder (16) is fixed to the mounting bracket (7) by screws. The outer walls of both ends of the heat exchange tube shell (1) are provided with annular positioning grooves (22), and the inner wall of the annular positioning grooves (22) is provided with a circular sealing plate (23). The inner wall of the heat exchange tube shell (1) is inserted with a spiral guide plate (25), and the outer wall of the spiral guide plate (25) is provided with equally spaced circular through holes (26). The spiral guide plate (25) is provided with equally spaced spiral heat exchange tubes (24) inside. The L-shaped fixing plate (13) has a first magnet (14) fixed on the outer wall of the side near the connecting rod (10), and the connecting rod (10) has a second magnet (15) fixed on the outer wall of the side near the L-shaped fixing plate (13). The first magnet (14) and the second magnet (15) have opposite magnetism. The other side of the octagonal column (9) has equidistantly distributed diagonal bracing plates (17) welded on the outer wall. The end of the diagonal bracing plate (17) has a compression spring (18) welded on the outer wall along the inclined direction. The diagonal bracing plate (17), the compression spring (18) and the connecting rod (10) are located in the same vertical plane. A temperature sensor (31) is installed on the inner wall of the drain pipe (30), and electric heating wires (32) are installed in a ring on the inner wall of the first sealing pipe head (27) at equal intervals.

2. The slag flushing water impurity interception device according to claim 1, characterized in that, The axis of the liquid inlet pipe (3) and the axis of the connecting pipe (5) are on the same straight line, and the top outer wall of the arc-shaped slag-blocking shell (4) is welded with symmetrically distributed arc-shaped overflow baffles (6).

3. The slag flushing water impurity interception device according to claim 1, characterized in that, The height of the intercepting pipe (11) is adapted to the width of the inner wall of the arc-shaped slag-blocking shell (4), and the radius of the intercepting pipe (11) is adapted to the radius of the liquid inlet pipe (3).

4. The slag flushing water impurity interception device according to claim 1, characterized in that, The top side of the connecting pipe (5) is connected to a rectangular sealing shell (19), and an intercepting mesh plate (20) is slidably inserted into the inner wall of the rectangular sealing shell (19). A lifting handle (21) is welded to the top outer wall of the intercepting mesh plate (20).

5. The slag flushing water impurity interception device according to claim 4, characterized in that, The outer wall of the connecting pipe (5) is fixed with an arc-shaped clamp (33) by bolts, and a collection frame (34) is welded to the top outer wall of the arc-shaped clamp (33).

6. The slag flushing water impurity interception device according to claim 1, characterized in that, The servo motor (8), telescopic cylinder (16), temperature sensor (31) and electric heating wire (32) are all connected to the PLC controller via signal lines, and the PLC controller is connected to an external power supply via wires.

7. A method for improving the efficiency of waste heat in slag flushing water, using the slag flushing water impurity interception device as described in claim 5, characterized in that, Includes the following steps: S1: First, assemble the impurity interception device and connect it to an external power source. After the power supply is completed, test run the impurity interception device. After it runs normally, connect the connecting pipe (5) to the external slag flushing water pipe. S2: After the connection is completed, the servo motor (8) is driven to rotate the interceptor pipe (11). When the bottom interceptor pipe (11) is slidably inserted into the inner wall of the arc-shaped slag-blocking shell (4), and the axis of the interceptor pipe (11) is aligned with the axis of the connecting pipe (5), the circular filter screen (12) will filter the slag flushing water and intercept the solid impurities inside the slag flushing water, thereby completing a single filtration. S3: When the flushing water after the first filtration passes through the intercepting mesh plate (20) at the rear, it will be filtered again to intercept the solid particles and impurities inside the flushing water. When the circular filter screen (12) intercepts too many impurities and the mesh is clogged, the PLC controller controls the servo motor (8) to drive it to rotate a certain angle, and after the intercepting tube (11) is rotated out, the telescopic cylinder (16) is activated to impact the connecting rod (10). After the connecting rod (10) hits the compression spring (18) and vibrates, it will shake out the impurity particles inside the intercepting tube (11) and collect them in the collection frame (34). S4: After the double-filtered slag flushing water enters the heat exchange tube shell (1), the spiral guide plate (25) set inside the heat exchange tube shell (1) will greatly increase the flow path of the high-temperature slag flushing water. At this time, the cold water that needs to be heat exchanged enters the first sealing tube head (27) from the water inlet pipe (28), passes through the spiral heat exchange tube (24) and flows in the opposite direction to the high-temperature slag flushing water, thereby completing the heat exchange and making efficient use of the waste heat of the slag flushing water. S5: When the hot water after heat exchange is discharged from the drain pipe (30), the temperature sensor (31) installed thereon will detect the water temperature. When the temperature is detected as not reaching the temperature for reuse, the electric heating wire (32) will be activated to reheat the hot water and then discharge it for reuse.

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