Process cooling water system

Abstract

The utility model relates to a process cooling water system, and belongs to the technical field of water chilling units. The process cooling water system comprises a process cooling water return main pipe, a process cooling water supply main pipe, a first heat exchanger, a direct cooling unit and a cooling tower, and the cooling tower comprises a cooling tower water inlet main pipe and a cooling tower water outlet main pipe. The hot water side of the first heat exchanger and the hot water side of the direct cooling unit are respectively connected in parallel between the process cooling water return main pipe and the process cooling water supply main pipe through branch pipes; the cold water side of the first heat exchanger and the cold water side of the direct cooling unit are connected between the cooling tower water inlet main pipe and the cooling tower water outlet main pipe in parallel through branch pipes. According to the process cooling water system, the cooling loops of the process cooling water can be switched according to the external environment temperatures in different seasons, and the preparation cost of the process cooling water is reduced.

Description

Technical Field

[0001] This application relates to the field of cooling unit technology, and more specifically, to a process cooling water system. Background Technology

[0002] With the rapid development of automation, the requirements for ambient temperature in workshop equipment are becoming increasingly stringent. Operating workshop equipment within a set temperature range provides a favorable production environment, ensures product quality, and extends the equipment's lifespan. Process cooling water systems (PCW) provide circulating cooling water to the workshop's process equipment, promptly removing the heat generated and maintaining the equipment's temperature within a preset range.

[0003] Existing process cooling water systems primarily rely on chilled water at a constant temperature as the source to produce process cooling water. This process cooling water enters the workshop, absorbs heat to increase its temperature, leaves the workshop, is cooled by chilled water, and then recirculates back into the workshop. However, for regions with significant temperature differences between summer and winter, the production cost of process cooling water is relatively high. Utility Model Content

[0004] Therefore, this application proposes a process cooling water system that switches the cooling circuit of the process cooling water according to the external ambient temperature in different seasons, thereby reducing the preparation cost of process cooling water.

[0005] Some embodiments of the process cooling water system of this application include a process cooling water return main, a process cooling water supply main, a first heat exchanger, a direct-cooling unit, and a cooling tower. The cooling tower includes a cooling tower inlet main and a cooling tower outlet main, which are respectively connected to the inlet and outlet of the cooling tower. The hot water sides of the first heat exchanger and the direct-cooling unit are respectively connected in parallel between the process cooling water return main and the process cooling water supply main through branch pipes. The cold water sides of the first heat exchanger and the direct-cooling unit are respectively connected in parallel between the cooling tower inlet main and the cooling tower outlet main through branch pipes.

[0006] Optionally, the process cooling water return main is connected to the hot-side inlet of the first heat exchanger via a first branch pipe, and the process cooling water supply main is connected to the hot-side outlet of the first heat exchanger via a second branch pipe.

[0007] Optionally, the direct cooling unit includes a condenser and an evaporator. The process cooling water return main is connected to the inlet of the evaporator via a third branch pipe. The process cooling water supply main is connected to the outlet of the evaporator via a fourth branch pipe. The cooling tower inlet main is connected to the inlet of the condenser via a fifth branch pipe. The cooling tower outlet main is connected to the outlet of the condenser via a sixth branch pipe. The process cooling water return main, the first branch pipe, and the third branch pipe are connected by a first proportioning valve.

[0008] Optionally, the cooling tower inlet main pipe is connected to the cold side outlet of the first heat exchanger via a seventh branch pipe, the cooling tower outlet main pipe is connected to the cold side inlet of the first heat exchanger via an eighth branch pipe, and the cooling tower outlet main pipe, the sixth branch pipe, and the eighth branch pipe are connected via a second proportioning valve.

[0009] Optionally, the process cooling water system further includes a second heat exchanger, the hot water side of which is connected between the process cooling water return main and the process cooling water supply main via a branch pipe, and the cold water side of which is connected to an external constant temperature cold water supply circuit.

[0010] Optionally, the process cooling water return main is connected to the hot-side inlet of the second heat exchanger via a ninth branch pipe, the process cooling water supply main is connected to the hot-side outlet of the second heat exchanger via a tenth branch pipe, and the ninth branch pipe is connected to the process cooling water return main via a third proportioning valve.

[0011] Optionally, a first horizontal centrifugal pump is installed on the process cooling water return main.

[0012] Optionally, a bag filter is installed on the process cooling water return main.

[0013] Optionally, a second horizontal centrifugal pump is installed on the cooling tower inlet main.

[0014] Optionally, the process cooling water system further includes a control device. The process cooling water supply main has a preset required temperature T1 and an external ambient temperature of T2. When T1-T2>8℃, the control device is configured to control the cooling tower to supply cooling water to the cold water side of the first heat exchanger.

[0015] Compared with existing technologies, this solution has the following advantages:

[0016] The process cooling water system of this application embodiment includes a first heat exchanger and a direct cooling unit arranged in parallel, and both use cooling towers to supply cooling water to their cold water side. Under the condition that the preset temperature of the process cooling water supply main remains unchanged, the first heat exchanger or the direct cooling unit can be flexibly selected to cool the process cooling water according to the external ambient temperature, or the first heat exchanger or the direct cooling unit can be used simultaneously to cool the process cooling water. The load ratio of the two can be adjusted according to the demand, thereby reducing the preparation cost of process cooling water.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A process schematic diagram of the process cooling water system provided in the embodiments of this application;

[0020] Figure 2 A process flow diagram of the process cooling water system provided in the embodiments of this application.

[0021] Icons: 100 - Process cooling water system; 110 - Process cooling water return main; 111 - First branch pipe; 112 - Third branch pipe; 113 - Ninth branch pipe; 114 - First horizontal centrifugal pump; 115 - Bag filter; 116 - Water tank; 120 - Process cooling water supply main; 121 - Second branch pipe; 122 - Fourth branch pipe; 123 - Tenth branch pipe; 130 - First heat exchanger; 140 - Direct cooling unit; 141 - Condenser; 142 - Evaporator; 150 - Cooling tower; 151 - Cooling tower inlet main; 1511 - Fifth branch pipe; 1512 - Seventh branch pipe; 1513 - Second horizontal centrifugal pump; 152 - Cooling tower outlet main; 1521 - Sixth branch pipe; 1522 - Eighth branch pipe; 160 - Second heat exchanger; 171 - First proportioning valve; 172 - Second proportioning valve; 173 - Third proportioning valve; 181 - Constant temperature cold water supply main; 182 - Constant temperature cold water return main. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] like Figure 1 As shown, the process cooling water system 100 of some embodiments of this application includes a process cooling water return main pipe 110, a process cooling water supply main pipe 120, a first heat exchanger 130, a direct cooling unit 140, and a cooling tower 150. The cooling tower 150 includes a cooling tower inlet main pipe 151 and a cooling tower outlet main pipe 152, which are respectively connected to the inlet and outlet of the cooling tower 150. The hot water sides of the first heat exchanger 130 and the direct cooling unit 140 are respectively connected in parallel between the process cooling water return main pipe 110 and the process cooling water supply main pipe 120 through branch pipes. The cold water sides of the first heat exchanger 130 and the direct cooling unit 140 are respectively connected in parallel between the cooling tower inlet main pipe 151 and the cooling tower outlet main pipe 152 through branch pipes.

[0025] The process cooling water return main 110 is connected from the process cooling water outlet of the workshop, and the process cooling water supply main 120 sends the cooled process cooling water to the process cooling water inlet of the workshop, circulating to cool the workshop equipment and environment, and maintaining the workshop equipment and environment within the preset temperature range.

[0026] The hot water side of the first heat exchanger 130 and the direct cooling unit 140 refers to the inlet and outlet of the channel for the high-temperature cooling water after the process cooling water has passed through the workshop heat exchange, i.e., the hot side inlet and hot side outlet; the cold water side of the first heat exchanger 130 and the direct cooling unit 140 refers to the inlet and outlet of the low-temperature cooling water used to cool the high-temperature cooling water, i.e., the cold side inlet and cold side outlet.

[0027] The process cooling water system 100 of this application embodiment includes a first heat exchanger 130 and a direct cooling unit 140 arranged in parallel, and both are supplied with cooling water by a cooling tower 150. When the preset temperature T1 of the process cooling water supply main 120 remains unchanged, the first heat exchanger 130 or the direct cooling unit 140 can be flexibly selected to cool the process cooling water according to the external ambient temperature T2, or the first heat exchanger 130 or the direct cooling unit 140 can be used to cool the process cooling water at the same time. The load ratio of the two can be adjusted according to the demand, thereby reducing the preparation cost of process cooling water.

[0028] The process cooling water return main 110 is connected to the hot-side inlet of the first heat exchanger 130 via the first branch 111, and the process cooling water supply main 120 is connected to the hot-side outlet of the first heat exchanger 130 via the second branch 121.

[0029] The first heat exchanger 130 can be a plate heat exchanger or a shell-and-tube heat exchanger.

[0030] With this configuration, the hot water side of the first heat exchanger 130 can be connected to the process cooling water return main 110 and the process cooling water supply main 120, respectively.

[0031] The direct cooling unit 140 includes a condenser 141 and an evaporator 142. The process cooling water return main pipe 110 is connected to the inlet of the evaporator 142 via the third branch pipe 112. The process cooling water supply main pipe 120 is connected to the outlet of the evaporator 142 via the fourth branch pipe 122. The cooling tower inlet main pipe 151 is connected to the inlet of the condenser 141 via the fifth branch pipe 1511. The cooling tower outlet main pipe 152 is connected to the outlet of the condenser 141 via the sixth branch pipe 1521. The process cooling water return main pipe 110, the first branch pipe 111 and the third branch pipe 112 are connected by the first proportioning valve 171.

[0032] As a direct-cooling ice machine, the 140 direct-cooling unit has high refrigeration efficiency and can produce process cooling water with the same outlet water temperature even when the cold-side water source temperature is high.

[0033] The flow ratio of the first branch pipe 111 and the third branch pipe 112 can be adjusted by the first proportioning valve 171, thereby adjusting the load ratio of the first heat exchanger 130 and the direct cooling unit 140. When the external environment is low, the first heat exchanger 130 can be used in conjunction with the cooling tower 150 to produce process cooling water, thereby reducing operating power and reducing the cost of process cooling water production.

[0034] The cooling tower inlet main pipe 151 is connected to the cold side outlet of the first heat exchanger 130 through the seventh branch pipe 1512, and the cooling tower outlet main pipe 152 is connected to the cold side inlet of the first heat exchanger 130 through the eighth branch pipe 1522. The cooling tower outlet main pipe 152, the sixth branch pipe 1521 and the eighth branch pipe 1522 are connected through the second proportioning valve 172.

[0035] The flow ratio of the sixth branch pipe 1521 and the eighth branch pipe 1522 can be adjusted by the second proportioning valve 172, thereby adjusting the supply ratio of cooling water to the first heat exchanger 130 and the direct cooling unit 140, so that the water supply on the cooling tower 150 side matches the load on its workshop side.

[0036] In some embodiments of this application, the process cooling water system 100 further includes a second heat exchanger 160. The hot water side of the second heat exchanger 160 is connected between the process cooling water return main pipe 110 and the process cooling water supply main pipe 120 via a branch pipe, and the cold water side of the second heat exchanger 160 is connected to an external constant temperature cold water supply circuit.

[0037] The second heat exchanger 160 is a plate heat exchanger. The external constant temperature cold water supply circuit includes a constant temperature cold water supply main pipe 181 and a constant temperature cold water return main pipe 182. The cold side inlet of the second heat exchanger 160 is connected to the constant temperature cold water supply main pipe 181, and the cold side outlet is connected to the constant temperature cold water return main pipe 182.

[0038] For example, the external constant temperature cold water supply circuit can be a heating, ventilation and air conditioning (HVAC) water supply circuit, or a cold water supply circuit prepared by other equipment.

[0039] This configuration allows the use of external constant-temperature cold water as a cold source to prepare process cooling water, which is unaffected by the temperature of the external environment and has good stability.

[0040] It is understandable that the number of the first heat exchanger 130, the direct cooling unit 140, and the second heat exchanger 160 can be one or more, and all can be set in parallel. Depending on the needs, only one or more of them can be used to jointly produce process cooling water, thereby reducing power consumption.

[0041] The process cooling water return main 110 is connected to the hot side inlet of the second heat exchanger 160 through the ninth branch 113. The process cooling water supply main 120 is connected to the hot side outlet of the second heat exchanger 160 through the tenth branch 123. The ninth branch 113 is connected to the process cooling water return main 110 through the third proportioning valve 173.

[0042] The flow ratio between the ninth branch pipe 113 and the process cooling water return main pipe 110 can be adjusted by the third proportioning valve 173, thereby adjusting the load ratio of the second heat exchanger 160. When the external ambient temperature is low, the load of the second heat exchanger 160 is reduced, while the load of the first heat exchanger 130 and the direct cooling unit 140 is increased, thereby reducing the demand for external constant temperature cold water supply and thus reducing the preparation cost of process cooling water.

[0043] A first horizontal centrifugal pump 114 is installed on the process cooling water return main 110 to provide sufficient head for the process cooling water in the process cooling water return main 110, so that it enters each heat exchanger at a preset pressure and flow rate.

[0044] A bag filter 115 is installed on the process cooling water return main pipe 110 to filter impurities in the process cooling water, preventing impurities from entering each heat exchanger and reducing the heat exchange efficiency and service life of each heat exchanger.

[0045] A second horizontal centrifugal pump 1513 is installed on the cooling tower inlet water main 151 to provide sufficient head for the cooling water in the cooling tower inlet water main 151, so that it enters the cooling tower 150 for spray cooling at a preset pressure and flow rate.

[0046] like Figure 2 As shown, the first horizontal centrifugal pump 114, the bag filter 115, and the second horizontal centrifugal pump 1513 can all be configured as multiple units connected in parallel to improve the reliability of the entire system.

[0047] like Figure 2 As shown, a water tank 116 is also connected to the process cooling water return main pipe 110.

[0048] The process cooling water system 100 also includes a control device. The process cooling water supply main 120 has a preset required temperature T1 and an external ambient temperature T2. When T1-T2>8℃, the control device is configured to control the cooling tower 150 to supply cooling water to the cold water side of the first heat exchanger 130.

[0049] The control device is connected to each distribution valve via signal. By controlling the distribution ratio of each distribution valve, the load ratio of each heat exchanger, as well as the operation and shutdown of each heat exchanger, are controlled.

[0050] The working principle of the process cooling water system 100 is as follows:

[0051] When T1-T2>8℃, that is, the external ambient temperature T2 is significantly lower than the preset required temperature T1 of the process cooling water supply main 120, for example in winter, the cooling tower 150 is used in conjunction with the first heat exchanger 130 to prepare process cooling water. The direct cooling unit 140 and the second heat exchanger 160 can be shut down, or they can assist in the preparation of process cooling water when the first heat exchanger 130 is at full load.

[0052] When 0≤T1-T2≤8℃, that is, the external ambient temperature T2 is slightly lower than the preset required temperature T1 of the process cooling water supply main 120, such as in spring and autumn, the cooling tower 150 is used in conjunction with the direct cooling unit 140 to prepare process cooling water. The first heat exchanger 130 and the second heat exchanger 160 can be shut down, or they can assist in the preparation of process cooling water when the direct cooling unit 140 is at full load.

[0053] When T1 < T2, that is, the external ambient temperature T2 is higher than the preset required temperature T1 of the process cooling water supply main 120, for example in summer, the conventional direct cooling unit 140 and the second heat exchanger 160 are used to prepare process cooling water, and the first heat exchanger 130 is shut down.

[0054] The process cooling water system 100 of this application embodiment adds a first heat exchanger 130 and a direct cooling unit 140 arranged in parallel, and both use a cooling tower 150 as the cold-side water source. On the one hand, the cooling tower 150 can be used to provide the cold-side water source when the external ambient temperature T2 is low. On the other hand, the direct cooling unit 140 has a high cooling efficiency and can produce process cooling water at the same temperature when the cold-side water source temperature is high, reducing the demand for the original external constant temperature cold water. Since the cooling loop of the process cooling water is switched according to the external ambient temperature in different seasons, the production cost of process cooling water is reduced.

[0055] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A process cooling water system (100), characterized by, The system comprises a process cooling water return main (110), a process cooling water supply main (120), a first heat exchanger (130), a direct cooling unit (140), and a cooling tower (150) comprising a cooling tower water inlet main (151) and a cooling tower water outlet main (152) connected to the water inlet and outlet of the cooling tower (150) respectively, the hot water sides of the first heat exchanger (130) and the direct cooling unit (140) are connected in parallel between the process cooling water return main (110) and the process cooling water supply main (120) through branch pipes, and the cold water sides of the first heat exchanger (130) and the direct cooling unit (140) are connected in parallel between the cooling tower water inlet main (151) and the cooling tower water outlet main (152) through branch pipes.

2. The process cooling water system (100) according to claim 1, characterized in that The process cooling water return main (110) is connected to the hot side water inlet of the first heat exchanger (130) through a first branch pipe (111), and the process cooling water supply main (120) is connected to the hot side water outlet of the first heat exchanger (130) through a second branch pipe (121).

3. The process cooling water system (100) according to claim 2, characterized in that The direct cooling unit (140) comprises a condenser (141) and an evaporator (142), the process cooling water return main (110) is connected to the water inlet of the evaporator (142) through a third branch pipe (112), the process cooling water supply main (120) is connected to the water outlet of the evaporator (142) through a fourth branch pipe (122), the cooling tower water inlet main (151) is connected to the water inlet of the condenser (141) through a fifth branch pipe (1511), the cooling tower water outlet main (152) is connected to the water outlet of the condenser (141) through a sixth branch pipe (1521), and the process cooling water return main (110), the first branch pipe (111), and the third branch pipe (112) are connected through a first proportioning valve (171).

4. The process cooling water system (100) according to claim 3, characterized in that The cooling tower water inlet main (151) is connected to the cold side water outlet of the first heat exchanger (130) through a seventh branch pipe (1512), the cooling tower water outlet main (152) is connected to the cold side water inlet of the first heat exchanger (130) through an eighth branch pipe (1522), and the cooling tower water outlet main (152), the sixth branch pipe (1521), and the eighth branch pipe (1522) are connected through a second proportioning valve (172).

5. The process cooling water system (100) of claim 1, wherein, The system further comprises a second heat exchanger (160), the hot water side of the second heat exchanger (160) is connected between the process cooling water return main (110) and the process cooling water supply main (120) through a branch pipe, and the cold water side of the second heat exchanger (160) is connected to an external constant temperature cold water supply circuit.

6. The process cooling water system (100) according to claim 5, characterized in that The process cooling water return main (110) is connected with the hot side water inlet of the second heat exchanger (160) through a ninth branch pipe (113), and a process cooling water supply main (120) is connected with the hot side water outlet of the second heat exchanger (160) through a tenth branch pipe (123), and the ninth branch pipe (113) is connected to the process cooling water return main (110) through a third proportioning valve (173).

7. The process cooling water system (100) of claim 1, wherein, A first horizontal centrifugal pump (114) is arranged on the process cooling water return main (110).

8. The process cooling water system (100) of claim 1, wherein, A bag filter (115) is arranged on the process cooling water return main (110).

9. The process cooling water system (100) of claim 1, wherein, A second horizontal centrifugal pump (1513) is arranged on the cooling tower water inlet main (151).

10. The process cooling water system (100) of claim 1, wherein, Further comprising a control device, the process cooling water supply main (120) has a preset required temperature T1, and the external ambient temperature is T2, when T1-T2>8℃, the control device is configured to control the cooling tower (150) to provide cooling water to the cold water side of the first heat exchanger (130).

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