Heat recovery system for continuous extrusion process

Abstract

The invention discloses a heat recovery system for a continuous extrusion process, belongs to the technical field of continuous extrusion production, and aims to solve the problem of energy waste of an existing continuous extrusion process. Comprising a preheating system and a cooling system; the cooling system comprises a cooling water tank, the cooling water tank is connected with a cooling device through a first cooling water supply pipe, the extrusion device is connected with the first cooling water supply pipe through a second cooling water supply pipe, the cooling device is connected with the cooling water tank through a first cooling water return pipe, and the extrusion device is connected with the cooling water tank through a second cooling water return pipe. The preheating system comprises a first radiator, the water return end of the cooling system is sequentially connected with a second radiator, the first radiator and a cooling water tank, the first radiator is located in the preheating water tank, and the second radiator is located in the preheating device; the heat of extrusion and cooling procedures in continuous extrusion production is transferred to other procedures needing to be heated, so that the heat demand gradient of the procedures needing to be heated is reduced, and the energy consumption is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous extrusion production, and in particular relates to a continuous extrusion process heat recovery system. Background Art

[0002] The continuous extrusion process can combine the cladding material and the coated material together by extrusion, and is currently the main production process for producing bimetallic cladding materials such as copper clad steel.

[0003] When the coating material is produced by the continuous extrusion process, the desired product can be formed after the extruded coating material is crystallized and cooled. At the same time, a large amount of heat is generated during the extrusion process. Currently, the heat generated by continuous extrusion is generally taken away by cooling equipment and discharged to the outside, resulting in energy waste. Summary of the invention

[0004] The purpose of the present invention is to provide a continuous extrusion process heat recovery system to solve the problem of energy waste in the existing continuous extrusion process. The technical solution adopted by the present invention is as follows:

[0005] It includes a continuous extrusion system and a heat recovery system, wherein the continuous extrusion system includes an unwinding device, a shot blasting device, a cleaning and drying device, a preheating device, an induction heating device, an extrusion device, a cooling device, a traction device and a winding device which are connected in sequence, and the heat recovery system includes a cleaning system, a preheating system and a cooling system;

[0006] The cooling system includes a cooling water tank, a heat exchanger and a refrigerator, the cooling water tank is connected to the heat medium inlet of the heat exchanger through a first circulation pump, the heat medium outlet of the heat exchanger is connected to the cooling device through a first cooling water supply pipe, the extrusion device is connected to the first cooling water supply pipe through a second cooling water supply pipe, the cooling device is connected to the water inlet end of the cooling main return pipe through the first cooling water return pipe, the extrusion device is connected to the first cooling water return pipe through the second cooling water return pipe, and the water outlet end of the cooling main return pipe is connected to the cooling water tank;

[0007] The preheating system comprises a second radiator and a first radiator, one end of the preheating water supply pipe is connected to the water outlet end of the first cooling water return pipe, and the other end of the preheating water supply pipe is connected to the second radiator, the intermediate connecting pipe, the first radiator, the preheating water return pipe and the cooling water tank in sequence, the first radiator is in the preheating water tank, and the second radiator is in the preheating device;

[0008] The cleaning system includes a heating water tank, a spray device is provided on the top of the cleaning and drying device, the heating water tank is connected to the spray device through a high-temperature water supply pipe, a third circulation pump is provided on the high-temperature water supply pipe, the cleaning and drying device is connected to the preheating water tank through a high-temperature water return pipe, the preheating water tank is connected to the heating water tank through a fourth circulation pump, a heater is provided in the heating water tank, a first electric valve is provided on the preheating water supply pipe, a second electric valve is provided on the cooling main return pipe, and the first electric valve and the second electric valve are electrically connected to the PLC respectively.

[0009] Furthermore, the freezer is provided with an air-cooling fan.

[0010] Furthermore, a temperature transmitter is provided on the first cooling water supply pipe, and the temperature transmitter is electrically connected to the refrigerator.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention combines a cleaning system, a preheating system and a cooling system to transfer the heat of the extrusion and cooling processes in the continuous extrusion production to other processes that need to be heated, so that the heat demand gradient of the processes that need to be heated is reduced, and energy consumption is reduced. The circulating cooling water is refrigerated after releasing heat, so as to achieve the purpose of saving energy consumption. Energy consumption is saved on the basis of the original process, heat waste is minimized, the method is simple and feasible, and the investment in other equipment can be reduced, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the connection between the present invention and a continuous extrusion system.

[0015] In the figure, 1. cooling water tank, 2. first circulation pump, 3. air cooling fan, 4. refrigerator, 5. heat exchanger, 6. temperature transmitter, 7. first cooling water supply pipe, 8. first cooling water return pipe, 9. second cooling water supply pipe, 10. second cooling water return pipe, 11. second radiator, 12. high temperature water supply pipe, 13. spray device, 14. high temperature water return pipe, 15. heating water tank, 16. heater, 17. fourth circulation pump, 18. preheating water tank, 19. second circulation Circular pump, 20. Third circulating pump, 21. Intermediate connecting pipe, 22. First radiator, 23. Preheating water supply pipe, 24. First electric valve, 25. Cooling main return pipe, 26. Second electric valve, 27. Unwinding device, 28. Shot blasting device, 29. Cleaning and drying device, 30. Preheating device, 31. Induction heating device, 32. Extrusion device, 33. Cooling device, 34. Traction device, 35. Rewinding device, 36. Drive control, 37. Touch screen, 38. Preheating return pipe. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0017] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0019] Example: Figure 1 , Figure 2 As shown, it includes a continuous extrusion system and a heat recovery system, the continuous extrusion system includes an unwinding device 27, a shot blasting device 28, a cleaning and drying device 29, a preheating device 30, an induction heating device 31, an extrusion device 32, a cooling device 33, a traction device 34 and a winding device 35 which are connected in sequence, and the heat recovery system includes a cleaning system, a preheating system and a cooling system;

[0020] The cooling system includes a cooling water tank 1, a heat exchanger 5 and a refrigerator 4. The cooling water tank 1 is connected to the heat medium inlet of the heat exchanger 5 through the first circulation pump 2. The heat medium outlet of the heat exchanger 5 is connected to the cooling device 33 through the first cooling water supply pipe 7. The extrusion device 32 is connected to the first cooling water supply pipe 7 through the second cooling water supply pipe 9. The cooling device 33 is connected to the water inlet end of the cooling main return pipe 25 through the first cooling water return pipe 8. The extrusion device 32 is connected to the first cooling water return pipe 8 through the second cooling water return pipe 10. The water outlet end of the cooling main return pipe 25 is connected to the cooling water tank 1;

[0021] The preheating system includes a second radiator 11 and a first radiator 22, one end of a preheating water supply pipe 23 is connected to the water outlet end of the first cooling water return pipe 8, and the other end of the preheating water supply pipe 23 is connected to the second radiator 11, the intermediate connecting pipe 21, the first radiator 22, the preheating water return pipe 38 and the cooling water tank 1 in sequence, the first radiator 22 is in the preheating water tank 18, and the second radiator 11 is in the preheating device 30;

[0022] The cleaning system includes a heating water tank 15, a spray device 13 is provided on the top of the cleaning and drying device 29, the heating water tank 15 is connected to the spray device 13 through a high-temperature water supply pipe 12, a third circulation pump 20 is provided on the high-temperature water supply pipe 12, the cleaning and drying device 29 is connected to a preheating water tank 18 through a high-temperature water return pipe 14, the preheating water tank 18 is connected to the heating water tank 15 through a fourth circulation pump 17, a heater 16 is provided in the heating water tank 15, a first electric valve 24 is provided on the preheating water supply pipe 23, a second electric valve 26 is provided on the cooling main return pipe 25, and the first electric valve 24 and the second electric valve 26 are electrically connected to the PLC respectively.

[0023] The refrigerator 4 is provided with a cooling fan 3 .

[0024] The temperature transmitter 6 is on the first cooling water supply pipe 7, and the temperature transmitter 6 is electrically connected to the refrigerator 4. The temperature transmitter 6 transmits the collected temperature data back to the refrigerator 4. The refrigerator 4 determines the working state according to the water temperature. The refrigerator 4 starts when the medium temperature in the first cooling water supply pipe 7 is greater than 30°C, and the refrigerator 4 stops when the medium temperature in the first cooling water supply pipe 7 is less than 30°C.

[0025] Figure 1 In the figure, the solid line represents the cooling system, the dotted line represents the preheating system, and the dotted line represents the cleaning system. The present invention is a system based on the extrusion process to realize heat source recovery, energy saving and carbon reduction. The bimetallic extrusion process is a bimetallic cladding technology realized by unwinding, shot blasting, cleaning, heating, extrusion, cooling, pulling and winding of the substrate. The first circulating pump 2 is used to pump the circulating cooling water in the cooling water tank 1 as a coolant into the extrusion device 32 and the cooling device 33 respectively to take away the heat generated during the continuous extrusion process. The return water temperature of the extrusion device 32 and the cooling device 33 is measured by the temperature sensor. If the temperature is lower than 30°C, the PLC controls the second electric valve 26 to open and the first electric valve 24 to close, and the cooling water directly returns to the cooling water tank 1. If the return water temperature of the extrusion device 32 and the cooling device 33 is higher than 30°C, the PLC controls the first electric valve 24 to open and the second electric valve 26 to close. The cooling water returns to the cooling water tank 1 after releasing heat through the preheating system. The refrigerator 4 cools the circulating cooling water through the heat exchanger 5.

[0026] Generally speaking, the return water temperature of the circulating cooling water of the extrusion device 32 and the cooling device 33 can reach 50°C-60°C, which can basically meet the preheating temperature requirement of the preheating device 30 for the steel core. After the circulating cooling water releases heat to the preheating device 30 through the second radiator 11, the temperature drops to 40°C-50°C, and can still be used to preheat the washing water for the cleaning and drying device 29. After the circulating cooling water releases heat to the washing water in the preheating water tank 18 through the first radiator 22, the temperature can basically drop to below 30°C, meeting the return water temperature of the circulating cooling water and returning to the cooling water tank 1.

[0027] The fourth circulation pump 17 pumps the preheated cleaning water in the preheating water tank 18 to the heating water tank 15. The heater 16 in the heating water tank 15 heats the cleaning water to the required temperature. The third circulation pump 20 pumps the high-temperature cleaning water into the cleaning and drying device 29 to clean and dry the metal material. The high-temperature cleaning water after heat release flows back to the preheating water tank 18 through the high-temperature water return pipe 14.

[0028] The present invention combines a cleaning system, a preheating system and a cooling system to transfer the heat of the extrusion and cooling processes in the continuous extrusion production to other processes that need to be heated, so that the heat demand gradient of the processes that need to be heated is reduced, and energy consumption is reduced. The circulating cooling water is refrigerated after releasing heat, so as to achieve the purpose of saving energy consumption. Energy consumption is saved on the basis of the original process, heat waste is minimized, the method is simple and feasible, and the investment in other equipment can be reduced, saving costs.

[0029] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A continuous extrusion process heat recovery system, comprising a continuous extrusion system and a heat recovery system, wherein the continuous extrusion system comprises an unwinding device (27), a shot blasting device (28), a cleaning and drying device (29), a preheating device (30), an induction heating device (31), an extrusion device (32), a cooling device (33), a traction device (34) and a winding device (35) connected in sequence, characterized in that: The heat recovery system includes a cleaning system, a preheating system and a cooling system; The cooling system comprises a cooling water tank (1), a heat exchanger (5) and a refrigerator (4); the cooling water tank (1) is connected to the heat medium inlet of the heat exchanger (5) through a first circulation pump (2); the heat medium outlet of the heat exchanger (5) is connected to the cooling device (33) through a first cooling water supply pipe (7); the extrusion device (32) is connected to the first cooling water supply pipe (7) through a second cooling water supply pipe (9); the cooling device (33) is connected to the water inlet end of the low-temperature return pipe (25) through a first cooling water return pipe (8); the extrusion device (32) is connected to the first cooling water return pipe (8) through a second cooling water return pipe (10); and the water outlet end of the low-temperature return pipe (25) is connected to the cooling water tank (1); The preheating system comprises a second radiator (11) and a first radiator (22); one end of a preheating water supply pipe (23) is connected to a water outlet end of a first cooling water return pipe (8); the other end of the preheating water supply pipe (23) is connected in sequence to the second radiator (11), the intermediate connecting pipe (21), the first radiator (22), the preheating water return pipe (38) and the cooling water tank (1); the first radiator (22) is located in the preheating water tank (18), and the second radiator (11) is located in the preheating device (30); The cleaning system comprises a heating water tank (15), a spray device (13) is arranged on the top of the cleaning and drying device (29), the heating water tank (15) is connected to the spray device (13) through a high-temperature water supply pipe (12), a third circulation pump (20) is arranged on the high-temperature water supply pipe (12), the cleaning and drying device (29) is connected to a preheating water tank (18) through a high-temperature water return pipe (14), the preheating water tank (18) is connected to the heating water tank (15) through a fourth circulation pump (17), a heater (16) is arranged in the heating water tank (15), a first electric valve (24) is arranged on the preheating water supply pipe (23), a second electric valve (26) is arranged on the low-temperature return pipe (25), and the first electric valve (24) and the second electric valve (26) are respectively electrically connected to a PLC.

2. A continuous extrusion process heat recovery system according to claim 1, characterized in that: The refrigerator (4) is provided with an air-cooling fan (3).

3. A continuous extrusion process heat recovery system according to claim 2, characterized in that: A temperature transmitter (6) is provided on the first cooling water supply pipe (7), and the temperature transmitter (6) is electrically connected to the refrigerator (4).

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