A recirculating cooling system

Abstract

This application discloses a circulating cooling system, relating to the field of chemical equipment technology. The circulating cooling system of this application includes a water tank assembly and a controller. The water tank assembly has an outlet and a return outlet, and at least one circulating pipe connects the outlet and the return outlet. A primary cooling module and a secondary cooling module are installed on the circulating pipe, arranged at intervals along the direction from the outlet to the return outlet. In this circulating cooling system, the circulating water in the water tank assembly can flow sequentially to the primary and secondary cooling modules, completing multi-stage circulating cooling. This effectively improves the utilization rate of the circulating water, thereby reducing the flow rate of the circulating water while ensuring the cooling effect, thus reducing water waste.

Description

Technical Field

[0001] This application relates to the field of chemical equipment, and in particular to a circulating cooling system. Background Technology

[0002] In the production fields of petrochemicals, fertilizers, and fine chemicals, the chemical reactions and gas compression processes in reactors release a large amount of heat. At this time, a circulating water system is needed to cool down the reaction equipment to ensure the normal operation of the equipment and the quality of the products produced.

[0003] Most existing circulating water systems operate on a single-pass cooling model, resulting in insufficient utilization of the circulating water and low cooling efficiency. To improve cooling efficiency, the circulating water system needs to maintain a large flow rate to continuously cool the reaction equipment. However, a large flow rate leads to water waste and increases the company's water costs. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this application provides a circulating cooling system that can improve the utilization rate of circulating water and reduce the waste of water resources.

[0005] The circulating cooling system provided in this application adopts the following technical solution:

[0006] A circulating cooling system includes a water tank assembly and a controller. The water tank assembly has an outlet and a return outlet. At least one circulating pipe connects the outlet and the return outlet. A primary cooling module and a secondary cooling module are provided on the circulating pipe. The primary cooling module and the secondary cooling module are arranged at intervals along the direction from the outlet to the return outlet.

[0007] By adopting the above technical solution, the circulating water in the water tank component can flow sequentially to the primary cooling module and the secondary cooling module to complete multi-stage circulating cooling, which effectively improves the utilization rate of circulating water. This allows for a reduction in the flow rate of circulating water while ensuring the cooling effect, thereby reducing the waste of water resources.

[0008] In one specific implementation scheme, there are two circulation pipes, which are connected in parallel.

[0009] By adopting the above technical solution, the two circulation pipes can cool the reaction equipment in different areas respectively, effectively improving the application range of the circulation cooling system.

[0010] In one specific implementation scheme, the circulation pipe includes an outlet pipe connected to the outlet and a return pipe connected to the return outlet. The primary cooling module and the secondary cooling module are connected in series between the outlet pipe and the return pipe. A first flow meter, a first thermometer and a first pressure gauge are provided on the outlet pipe, and a second flow meter, a second thermometer and a second pressure gauge are provided on the return pipe.

[0011] By adopting the above technical solution, the first flow meter, the first thermometer, and the first pressure gauge can detect the circulating water in the outlet pipe, the second flow meter, the second thermometer, and the second pressure gauge can detect the circulating water in the return pipe, and the controller can adjust the parameters of the circulating water according to the detection results to improve the circulating cooling effect of the circulating water.

[0012] In one specific implementation scheme, an intermediate pipeline connects the primary cooling module and the secondary cooling module. The circulating cooling system further includes a first regulating pipe with its two ends connected to the outlet pipe and the intermediate pipeline, a first regulating valve disposed on the first regulating pipe, a second regulating pipe with its two ends connected to the return pipe and the intermediate pipeline, and a second regulating valve disposed on the second regulating pipe.

[0013] By adopting the above technical solution, the controller can adjust the circulating water flow rate in the primary cooling module and the secondary cooling module by controlling the opening and closing of the first regulating valve and the second regulating valve, so that the circulating water flow rate can match the reaction process of the reaction equipment, thereby further reducing the waste of water resources.

[0014] In one specific implementation scheme, a third flow meter is also provided at one end of the water outlet pipe near the first-stage cooling module, and a third pressure gauge and a fourth flow meter are sequentially provided on the intermediate pipe along the direction near the second-stage cooling module.

[0015] By adopting the above technical solution, the third flow meter, the third pressure gauge and the fourth flow meter can detect the circulating water entering the first-stage cooling module and the second-stage cooling module. The controller can control the opening and closing of the first regulating valve and the second regulating valve according to the detection results, so as to achieve precise adjustment of the circulating water flow in the first-stage cooling module and the second-stage cooling module.

[0016] In one specific implementation scheme, multiple first connecting pipes are connected between the water outlet pipe and the water outlet. The multiple first connecting pipes are arranged in parallel with each other, and each of the first connecting pipes is equipped with a first circulation pump.

[0017] By adopting the above technical solution, the controller can adjust the number of first circulation pumps to be turned on according to the flow rate of circulating water in the primary and secondary cooling modules, thereby effectively saving the overall energy consumption of the system.

[0018] In one specific implementation, the circulating cooling system further includes a first cooling pipe with its two ends connected to the secondary cooling module and the return water pipeline, a first cooling module disposed on the first cooling pipe, and a third thermometer.

[0019] By adopting the above technical solution, the first cooling module can cool the circulating water output from the secondary cooling module, so as to prevent the circulating water with excessive temperature from flowing back to the water tank component and affecting the subsequent circulating cooling process.

[0020] In one specific implementation scheme, the circulating cooling system further includes multiple processing pipes connected at both ends to the return water pipeline and the water tank assembly, and a water treatment module disposed on the processing pipes, wherein the multiple processing pipes are arranged in parallel with each other.

[0021] By adopting the above technical solution, the returned circulating water can flow into the water treatment module through the treatment pipe for treatment, which effectively improves the cleanliness of the circulating water and prevents the circulating water from contaminating the reaction equipment.

[0022] In one specific implementation scheme, the water tank assembly includes a water tank body and a plurality of second cooling modules disposed on the water tank body. Each of the second cooling modules is connected to the return water pipeline by a second cooling pipe. A third regulating valve is disposed on the second cooling pipe, and the plurality of second cooling pipes are arranged in parallel with each other.

[0023] By adopting the above technical solution, the returned circulating water can flow into the second cooling module through the second cooling pipe to complete further cooling, so that the circulating water flowing into the water tank body can be directly circulated and cooled.

[0024] In one specific implementation scheme, a fourth regulating valve is also provided at the end of the return water pipeline near the return water inlet.

[0025] By adopting the above technical solution, when the outside temperature is too low, the controller can open the fourth regulating valve, and the circulating water can flow directly into the water tank body through the return water pipe to reduce heat loss and prevent the circulating water temperature from being too low and affecting the reaction equipment.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] The circulating water in the water tank component can flow sequentially to the primary cooling module and the secondary cooling module to perform multi-stage circulating cooling of the reaction equipment, which effectively improves the utilization rate of circulating water. This allows the flow rate of circulating water to be reduced while ensuring the cooling effect, thereby reducing the waste of water resources. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the circulating cooling system according to an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Water tank assembly; 1a. Outlet; 1b. Return outlet; 1c. Water tank body; 1d. Second cooling module; 2. Circulation pipe; 2a. Outlet pipe; 2b. Return pipe; 2c. Intermediate pipe; 3. Primary cooling module; 4. Secondary cooling module; 5. First flow meter; 6. First thermometer; 7. First pressure gauge; 8. Second flow meter; 9. Second thermometer; 10. Second pressure gauge; 11. First regulating pipe; 12. First regulating valve; 13. Second regulating pipe; 14. Second regulating valve; 15. Third flow meter; 6. Third pressure gauge; 17. Fourth flow meter; 18. First connecting pipe; 19. First circulating pump; 20. First cooling pipe; 21. First cooling module; 22. Third thermometer; 23. Processing pipe; 24. Water treatment module; 25. Second cooling pipe; 26. Third regulating valve; 27. Fourth regulating valve; 28. Second connecting pipe; 29. ​​Second circulating pump; 30. Temperature alarm; 31. Vibration alarm; 32. Oil level alarm; 33. Water inlet pipe; 34. Fifth flow meter; 35. Fifth regulating valve; 36. Liquid level gauge. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] See Figure 1 As shown, a circulating cooling system includes a water tank assembly 1 and a controller (not shown). The water tank assembly 1 has an outlet 1a and a return outlet 1b, connected by two circulating pipes 2. Each circulating pipe 2 is equipped with a primary cooling module 3 and a secondary cooling module 4, which are arranged at intervals along the direction from the outlet 1a to the return outlet 1b. The controller can be a programmable logic controller (PLC), a distributed control system (DCS), or other existing control equipment. The controller enables the system to operate stably and accurately, thereby improving the yield of the reaction products. The primary cooling module 3 and the secondary cooling module 4 can be cooling equipment such as heat exchangers and condensers, which are existing technologies.

[0033] In this way, the circulating water in the water tank component 1 can flow sequentially to the primary cooling module 3 and the secondary cooling module 4 to complete multi-stage circulating cooling, effectively improving the utilization rate of circulating water. This allows for a reduction in the flow rate of circulating water while ensuring the cooling effect, thereby reducing the waste of water resources.

[0034] In this embodiment, two circulation pipes 2 are connected in parallel. Based on the installation height of the reaction equipment, the area where the reaction equipment is located is divided into a high-pressure zone and a low-pressure zone. The two parallel circulation pipes 2 pass through the high-pressure zone and the low-pressure zone respectively, circulating water to cool the reaction equipment in both zones. Based on the cooling effect and circulating water flow requirements of the reaction equipment, the area where the reaction equipment is located is divided into a primary cooling zone and a secondary cooling zone. A primary cooling module 3 is installed in the primary cooling zone, and a secondary cooling module 4 is installed in the secondary cooling zone. Circulating water flows sequentially through the primary cooling zone and the secondary cooling zone, and then circulates through the primary cooling module 3 and the secondary cooling module 4 to cool the reaction equipment in both zones.

[0035] In this embodiment, the circulation pipe 2 includes an outlet pipe 2a connected to the outlet 1a and a return pipe 2b connected to the return outlet 1b. The primary cooling module 3 and the secondary cooling module 4 are connected in series between the outlet pipe 2a and the return pipe 2b. The outlet pipe 2a is equipped with a first flow meter 5, a first thermometer 6 and a first pressure gauge 7. The return pipe 2b is equipped with a second flow meter 8, a second thermometer 9 and a second pressure gauge 10. The first flow meter 5, the first thermometer 6, the first pressure gauge 7, the second flow meter 8, the second thermometer 9 and the second pressure gauge 10 are all electrically connected to the controller.

[0036] The first flow meter 5, the first thermometer 6, and the first pressure gauge 7 are used to detect the circulating water in the outlet pipe 2a, so as to feed back the flow rate, temperature, and pressure data of the circulating water in the outlet pipe 2a to the controller; the second flow meter 8, the second thermometer 9, and the second pressure gauge 10 are used to detect the circulating water in the return pipe 2b, so as to feed back the flow rate, temperature, and pressure data of the circulating water in the return pipe 2b to the controller; the controller can adjust the parameters of the circulating water according to the detection results to improve the circulating cooling effect of the circulating water.

[0037] In this embodiment, an intermediate pipe 2c connects the primary cooling module 3 and the secondary cooling module 4. The circulating cooling system also includes a first regulating pipe 11 connected to the outlet pipe 2a and the intermediate pipe 2c at both ends, a first regulating valve 12 disposed on the first regulating pipe 11, a second regulating pipe 13 connected to the return pipe 2b and the intermediate pipe 2c at both ends, and a second regulating valve 14 disposed on the second regulating pipe 13. Both the first regulating valve 12 and the second regulating valve 14 are electrically connected to the controller.

[0038] A third flow meter 15 is installed at one end of the outlet pipe 2a near the primary cooling module 3. The third flow meter 15 is located between the first regulating pipe 11 and the primary cooling module 3. A third pressure gauge 16 and a fourth flow meter 17 are sequentially installed on the intermediate pipe 2c, along the direction near the secondary cooling module 4. The fourth flow meter 17 is located between the second regulating pipe 13 and the secondary cooling module 4. All three flow meters are electrically connected to the controller. The third flow meter 15 is used to detect the flow rate of the circulating water entering the primary cooling module 3. The third pressure gauge 16 is used to detect the pressure of the circulating water output from the primary cooling module 3. The fourth flow meter 17 is used to detect the flow rate of the circulating water entering the secondary cooling module 4. The controller can adjust the opening of the first regulating valve 12 and the second regulating valve 14 based on the detection results to adjust the flow rate of the circulating water in the primary cooling module 3 and the secondary cooling module 4, ensuring that the flow rate of the circulating water matches the reaction process of the reaction equipment, thereby further reducing water waste.

[0039] Specifically, if the pressure value of the third pressure gauge 16 is lower than the set value, the controller will automatically analyze the variation range of the third flow meter 15 and the fourth flow meter 17 to determine whether the flow rate in the first-stage cooling module 3 is smaller or the flow rate in the second-stage cooling module 4 is larger, thereby determining whether it is necessary to increase the opening of the first regulating valve 12 or decrease the opening of the second regulating valve 14; conversely, if the pressure value of the third pressure gauge 16 is higher than the set value, the controller will automatically analyze the variation range of the third flow meter 15 and the fourth flow meter 17 to determine whether the flow rate in the first-stage cooling module 3 is larger or the flow rate in the second-stage cooling module 4 is smaller, thereby determining whether it is necessary to decrease the opening of the first regulating valve 12 or increase the opening of the second regulating valve 14.

[0040] In this embodiment, three first connecting pipes 18 are connected between the water outlet pipe 2a and the water outlet 1a in the low-pressure zone. The three first connecting pipes 18 are arranged in parallel, and each first connecting pipe 18 is equipped with a first circulating pump 19. One of the three first circulating pumps 19 is a variable frequency pump, and the other two are fixed frequency pumps. All three first circulating pumps 19 are electrically connected to the controller. The variable frequency pump is the main pump, and the fixed frequency pumps are auxiliary pumps. The controller can adjust the number of fixed frequency pumps that are turned on according to the flow rate of circulating water in the primary cooling module 3 and the secondary cooling module 4 in the low-pressure zone, so that the circulating cooling system can always operate stably within the energy-saving range, thereby effectively saving the overall energy consumption of the system.

[0041] Specifically, when the output of the variable frequency pump reaches near full load, the controller automatically starts a fixed frequency pump and the variable frequency pump automatically reduces its output; when the output of the variable frequency pump approaches zero power, the controller automatically stops a fixed frequency pump and the variable frequency pump automatically increases its output.

[0042] In this embodiment, two second connecting pipes 28 connect the water outlet pipe 2a passing through the high-pressure zone and the water outlet pipe 2a passing through the low-pressure zone. The two second connecting pipes 28 are arranged in parallel, and each second connecting pipe 28 is equipped with a second circulation pump 29. The second circulation pump 29 is a variable frequency pump, and both second circulation pumps 29 are electrically connected to the controller. The three first circulation pumps 19 are used to pump the circulating water to the low-pressure zone, and the two second circulation pumps 29 are used to pump the circulating water to the high-pressure zone.

[0043] In this embodiment, the circulating cooling system further includes a first cooling pipe 20 connected at both ends to the secondary cooling module 4 and the return water pipe 2b, a first cooling module 21 mounted on the first cooling pipe 20, and a third thermometer 22. The first cooling module 21 is an air condenser. Due to limitations in the reaction process, the circulating water output from the secondary cooling module 4 may experience excessively high temperatures. The first cooling module 21 cools the circulating water output from the secondary cooling module 4 to prevent excessively hot circulating water from directly flowing back to the water tank assembly 1 and affecting the subsequent circulating cooling process.

[0044] In this embodiment, two treatment pipes 23 are also installed on the return water pipeline 2b passing through the low-pressure zone. These two treatment pipes 23 are connected in parallel, and both ends of each treatment pipe 23 are connected to the return water pipeline 2b and the water tank assembly 1, respectively. One treatment pipe 23 is equipped with an electrochemical processor, and the other treatment pipe 23 is equipped with a bypass processor. The electrochemical processor and the bypass processor are arranged along the direction from the return water pipeline 2b to the return water inlet 1b. Both the electrochemical processor and the bypass processor are existing technologies. The returned circulating water can pass through the electrochemical processor and the bypass processor respectively. Both can treat the circulating water to improve its cleanliness and prevent it from contaminating the reaction equipment.

[0045] In this embodiment, the water tank assembly 1 includes a water tank body 1c and four second cooling modules 1d disposed on the water tank body 1c. The water outlet 1a and the water return outlet 1b are respectively opened at both ends of the water tank body 1c. Each second cooling module 1d is connected to the water return pipe 2b by a second cooling pipe 25. A third regulating valve 26 is provided on the second cooling pipe 25. The four second cooling pipes 25 are arranged in parallel with each other. All four third regulating valves 26 are electrically connected to the controller.

[0046] The four second cooling modules 1d include two water-driven cooling towers and two electric cooling towers. Water-driven cooling towers are equipped with water-driven fans, and electric cooling towers are equipped with electric fans. Each electric fan has a temperature alarm 30, a vibration alarm 31, and an oil level alarm 32. A return water pipe 2b through the low-pressure zone connects one of the water-driven cooling towers and one of the electric cooling towers, and a return water pipe 2b through the high-pressure zone connects the other water-driven cooling tower and the other electric cooling tower. The water-driven and electric cooling towers are arranged along the direction closest to the return water inlet 1b. When the circulating water flows back from the return water pipe 2b to the water tank body 1c, a second thermometer 9 detects the return water temperature. The controller controls the opening and closing of the two third regulating valves 26 based on the detection result. The circulating water preferentially enters the water-driven cooling towers for cooling, and the remaining circulating water enters the electric cooling towers for cooling, allowing the circulating water flowing into the water tank body 1c to circulate again. Furthermore, the combination of water-driven and electric fans effectively saves energy.

[0047] In this embodiment, a fourth regulating valve 27 is also provided at one end of the return water pipe 2b near the return water port 1b. The fourth regulating valve 27 is electrically connected to the controller. When the outside temperature is too low, the controller can open the fourth regulating valve 27, and the circulating water can flow directly into the water tank body 1c through the return water pipe 2b to reduce heat loss and prevent the circulating water temperature from being too low and affecting the reaction equipment.

[0048] In this embodiment, the water tank body 1c is also connected to an inlet pipe 33, the end of which is connected to an external water source, which can be a tap water pipe. A fifth flow meter 34 and a fifth regulating valve 35 are installed on the inlet pipe 33. A level gauge 36 is also installed on the water tank body 1c. The controller is electrically connected to the fifth flow meter 34, the fifth regulating valve 35, and the level gauge 36. When the level gauge 36 shows that the liquid level in the water tank body 1c is lower than the set value, the controller opens the fifth regulating valve 35, and the inlet pipe 33 replenishes water into the water tank body 1c. When the level gauge 36 shows that the liquid level in the water tank body 1c reaches the set value, the controller closes the fifth regulating valve 35.

[0049] The implementation principle of a circulating cooling system according to an embodiment of this application is as follows:

[0050] Water is added to the water tank body 1c through the inlet pipe 33 to the set liquid level. Then the first circulation pump 19 and the second circulation pump 29 are turned on. The circulating water in the water tank body 1c enters the first-level cooling module 3 and the second-level cooling module 4 through the outlet pipe 2a and cools the reaction equipment through the first-level cooling module 3 and the second-level cooling module 4.

[0051] After being output from the secondary cooling module 4, the circulating water enters the first cooling module 21 through the first cooling pipe 20 for cooling.

[0052] After cooling, the circulating water passes through the return water pipe 2b and then reaches the treatment pipe 23. Subsequently, the circulating water enters the water treatment module 24 for treatment through the treatment pipe 23.

[0053] The treated circulating water enters the second cooling module 1d, where it is cooled down before returning to the main water tank 1c.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A recirculating cooling system comprising a water tank assembly (1) having a water outlet (1a) and a return water inlet (1b) and a controller, characterised in that: At least one circulation pipe (2) connects the outlet (1a) and the return outlet (1b). A primary cooling module (3) and a secondary cooling module (4) are provided on the circulation pipe (2). The primary cooling module (3) and the secondary cooling module (4) are arranged at intervals along the direction from the outlet (1a) to the return outlet (1b).

2. A recirculating cooling system according to claim 1, wherein: There are two circulation pipes (2), and the two circulation pipes (2) are connected in parallel.

3. A recirculating cooling system according to claim 1 or 2, wherein: The circulation pipe (2) includes an outlet pipe (2a) connected to the outlet (1a) and a return pipe (2b) connected to the return outlet (1b). The primary cooling module (3) and the secondary cooling module (4) are connected in series between the outlet pipe (2a) and the return pipe (2b). The outlet pipe (2a) is equipped with a first flow meter (5), a first thermometer (6) and a first pressure gauge (7). The return pipe (2b) is equipped with a second flow meter (8), a second thermometer (9) and a second pressure gauge (10).

4. A recirculating cooling system according to claim 3, wherein: The primary cooling module (3) and the secondary cooling module (4) are connected by an intermediate pipe (2c). The circulating cooling system also includes a first regulating pipe (11) with its two ends connected to the outlet pipe (2a) and the intermediate pipe (2c) respectively, a first regulating valve (12) provided on the first regulating pipe (11), a second regulating pipe (13) with its two ends connected to the return pipe (2b) and the intermediate pipe (2c) respectively, and a second regulating valve (14) provided on the second regulating pipe (13).

5. A recirculating cooling system according to claim 4, wherein: A third flow meter (15) is also provided at one end of the water outlet pipe (2a) near the first-stage cooling module (3), and a third pressure gauge (16) and a fourth flow meter (17) are sequentially provided on the intermediate pipe (2c) along the direction near the second-stage cooling module (4).

6. A recirculating cooling system according to claim 3, wherein: The water outlet pipe (2a) and the water outlet (1a) are also connected by multiple first connecting pipes (18), which are arranged in parallel with each other, and each of the first connecting pipes (18) is equipped with a first circulating pump (19).

7. A recirculating cooling system according to claim 3, wherein: The circulating cooling system also includes a first cooling pipe (20) connected at both ends to the secondary cooling module (4) and the return water pipe (2b), a first cooling module (21) disposed on the first cooling pipe (20), and a third thermometer (22).

8. A recirculating cooling system according to claim 3, wherein: The circulating cooling system also includes multiple processing pipes (23) that are connected at both ends to the return water pipe (2b) and the water tank assembly (1), respectively, and a water treatment module (24) installed on the processing pipes (23). The multiple processing pipes (23) are arranged in parallel with each other.

9. A recirculating cooling system according to claim 3, wherein: The water tank assembly (1) includes a water tank body (1c) and a plurality of second cooling modules (1d) disposed on the water tank body (1c). Each of the second cooling modules (1d) is connected to the return water pipe (2b) by a second cooling pipe (25). A third regulating valve (26) is provided on the second cooling pipe (25). The plurality of second cooling pipes (25) are arranged in parallel with each other.

10. A recirculating cooling system according to claim 3, wherein: A fourth regulating valve (27) is also provided at one end of the return water pipe (2b) near the return water inlet (1b).

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