Refrigeration station system and process cooling water system cold and heat coupling system

Abstract

The utility model relates to a cold and hot coupling system of a refrigeration station system and a process cooling water system. The cold and hot coupling system structurally comprises the refrigeration station system, an intermediate heat exchanger and the process cooling water system which are sequentially connected through pipelines. The utility model has the advantages that: 1) the problems of energy consumption increase and idle cooling capacity of the cooling tower caused by the adoption of a temperature difference bypass when the cooling water temperature of the refrigerating system is too low in transition seasons and winter are solved; the gradient utilization of the low-temperature cooling capacity of the low-temperature cooling water is realized through heat exchange between the intermediate heat exchanger and the process cooling water; 2) the intermediate heat exchanger cooling system is connected in series with the cooling water pipeline of the refrigerating system, the operation of the intermediate heat exchanger cooling system does not influence the original refrigerating system, and meanwhile, due to the existence of the intermediate heat exchanger cooling system, the stability of the water inlet temperature of the unit is better guaranteed; and (3) in practical application, the proportion of electric refrigeration cooling adopted by a process cooling water system can be effectively reduced in transition seasons and winter, the electric refrigeration cost is greatly reduced, and the energy consumption of a factory area is saved.

Description

Technical Field

[0001] This utility model relates to a cooling station thermal coupling system, specifically a system for efficient thermal coupling between a cooling station system and a process cooling water system suitable for year-round operation in industrial production scenarios. Background Technology

[0002] Industrial production requires numerous public basic energy supply systems, among which refrigeration and air conditioning systems are one of the main energy-consuming systems in factories. In the semiconductor and new energy fields, refrigeration and air conditioning systems may even need to operate year-round. Furthermore, in these fields, many process production equipment requires constant cooling to ensure their normal and safe operation; therefore, factory energy systems often include PCW (process cooling water) systems to cool the production equipment.

[0003] In most parts of my country, during the transitional seasons or winter, the outlet water temperature of the air conditioning cooling towers, i.e., the inlet water temperature of the chiller units, decreases as outdoor temperatures drop. While lower cooling water temperatures are beneficial for improving the chiller unit's refrigeration efficiency, the minimum pressure difference between the two components within the unit limits the cooling water temperature. Once this temperature drops to a certain level, it becomes necessary to maintain the cooling water above the specified temperature through temperature bypass or even heating. While these constant water temperature control methods are employed for the safe operation of the refrigeration unit, they incur additional pump consumption for the circulating pump or other heating energy consumption during actual operation.

[0004] The temperature of process cooling water is generally between 15-22℃. Because the heat generated by process equipment is stable and continuous, process cooling water often needs to operate year-round for continuous cooling. In actual process design, a medium-temperature chilled water system is often used to provide the required cooling capacity through plate heat exchangers or heat exchange units. However, the output of medium-temperature chilled water also requires electricity to produce.

[0005] In the above scenario, the cooling tower of the refrigeration system has sufficient heat dissipation capacity during the transition season and winter. Therefore, it is necessary to use temperature difference bypass or other heat sources to maintain the temperature of the cooling water. However, the process cooling water still needs to be refrigerated at this time. The two complement each other in terms of time and space. On the one hand, the cooling capacity of the refrigeration station is excessive, and on the other hand, the process cooling water still needs to consume electricity for refrigeration. Utility Model Content

[0006] This utility model proposes a cold and heat coupling system for a refrigeration station system and a process cooling water system, which aims to overcome the above-mentioned shortcomings of the existing technology and reduce energy consumption while meeting temperature regulation requirements.

[0007] The technical solution of this utility model is a cold and heat coupling system of a refrigeration station system and a process cooling water system, the structure of which includes a refrigeration station system, an intermediate heat exchanger and a process cooling water system connected in sequence by pipelines.

[0008] The refrigeration station system includes a cooling tower, a cooling circulation pump set, and a chiller unit. The cooling tower inlet is connected to the chiller unit outlet via a pipeline, and the cooling tower outlet is connected to the cooling circulation pump set inlet via a pipeline. The cooling circulation pump set outlet is connected to the inlet of one side of the intermediate heat exchanger and the chiller unit inlet via pipelines equipped with electric valves A and B, respectively. The pipeline between the cooling tower outlet and the cooling circulation pump set inlet is a bypass between the cooling tower inlet and the chiller unit outlet. The pipeline between the outlet of one side of the intermediate heat exchanger and the chiller unit inlet is a bypass between electric valve B and the chiller unit inlet.

[0009] The process cooling water system includes a process heat exchanger and a process cooling water circulation pump set. The outlet on one side of the intermediate heat exchanger is connected to the inlet on the other side of the process heat exchanger via a pipe equipped with an electric valve E. The outlet on the other side of the process heat exchanger is connected to the inlet of the process cooling water circulation pump set via a pipe. The outlet of the process cooling water circulation pump set is connected to the process intermediate temperature cooling water supply end via a pipe. The process intermediate temperature cooling water return end is bypassed by a pipe equipped with an electric valve C between the outlet on the other side of the intermediate heat exchanger and the inlet on the other side of the process heat exchanger. The inlet on the other side of the intermediate heat exchanger is bypassed by a pipe equipped with an electric valve D between the electric valve C and the process intermediate temperature cooling water return end. The inlet and outlet on one side of the process heat exchanger are respectively connected to the HVAC chilled water manifold via pipes.

[0010] Preferably, the outlet of the cooling circulation pump set is equipped with a temperature sensor A, and the inlet and outlet of the intermediate heat exchanger are equipped with temperature sensors B.

[0011] The advantages of this utility model are: 1) It solves the problem of increased energy consumption and idle cooling capacity of the cooling tower caused by using temperature difference bypass when the cooling water temperature is too low during the transition season and winter; by using the heat exchange between the intermediate heat exchanger and the process cooling water, the low-temperature cooling capacity of the low-temperature cooling water can be utilized in stages.

[0012] 2) The intermediate heat exchanger cooling system is connected in series with the cooling water pipeline of the refrigeration system. The operation of the intermediate heat exchanger cooling system will not have any impact on the original refrigeration system. At the same time, due to the existence of the intermediate heat exchanger cooling system, the stability of the unit's inlet water temperature is more guaranteed.

[0013] 3) In practical applications, it can effectively reduce the proportion of process cooling water systems using electric cooling during transitional seasons and winter, significantly reducing electric cooling costs and saving energy consumption in the plant area. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the thermal coupling system of the refrigeration station system and the process cooling water system of this utility model.

[0015] In the diagram, 1 is the refrigeration station system, 11 is the cooling tower, 12 is the cooling circulation pump set, 13 is the chiller unit, 2 is the process cooling water system (PCW), 21 is the process heat exchanger, 22 is the process cooling water circulation pump set, 3 is the intermediate heat exchanger, 41 is temperature sensor A, 42 is temperature sensor B, 51 is electric valve A, 52 is electric valve B, 53 is electric valve C, 54 is electric valve D, 55 is electric valve E, 61 is the process intermediate temperature cooling water supply end, 62 is the process intermediate temperature cooling water return end, 63 is the HVAC chilled water manifold, and AK are the first to eleventh connection points. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to embodiments and specific implementation methods.

[0017] like Figure 1 As shown, a cooling station system and a process cooling water system are coupled in a cold and heat system. The structure includes a cooling station system 1, an intermediate heat exchanger 3 and a process cooling water system 2 connected in sequence by pipes.

[0018] The refrigeration station system 1 includes a cooling tower 11, a cooling circulation pump set 12, and a chiller unit 13. The inlet of the cooling tower 11 is connected to the outlet of the chiller unit 13 via a pipe. The outlet of the cooling tower 11 is connected to the inlet of the cooling circulation pump set 12 via a pipe. The outlet of the cooling circulation pump set 12 is equipped with a temperature sensor A 41. The outlet of the cooling circulation pump set 12 is connected to the inlet of one side of the intermediate heat exchanger 3 and the inlet of the chiller unit 13 via pipes equipped with electric valves A 51 and B 52, respectively. The pipe between the outlet of the cooling tower 11 and the inlet of the cooling circulation pump set 12 is a bypass pipe between the inlet of the cooling tower 11 and the outlet of the chiller unit 13. The outlet of one side of the intermediate heat exchanger is connected to the pipe between the inlet of the chiller unit 13 and the electric valve B 52 via a bypass pipe.

[0019] The process cooling water system 2 includes a process heat exchanger 21 and a process cooling water circulation pump set 22. The outlet on one side of the intermediate heat exchanger 3 is connected to the inlet on the other side of the process heat exchanger 21 through a pipe with an electric valve E 55. The outlet on the other side of the process heat exchanger 21 is connected to the inlet of the process cooling water circulation pump set 22 through a pipe. The outlet of the process cooling water circulation pump set 22 is connected to the process intermediate temperature cooling water supply end 61 through a pipe. The process intermediate temperature cooling water return end 62 is bypassed by a pipe with an electric valve C 53 between the outlet on the other side of the intermediate heat exchanger 3 and the inlet on the other side of the process heat exchanger 21. The inlet on the other side of the intermediate heat exchanger 3 is bypassed by a pipe with an electric valve D 54 between the electric valve C 53 and the process intermediate temperature cooling water return end 62. The outlet and inlet on one side of the process heat exchanger 21 are respectively connected to the HVAC chilled water manifold 63 through pipes.

[0020] Specifically, in the refrigeration station system 1, the cooling circulation pump group 12 is used in two and has one standby, and the chiller unit 13 is set in two. A temperature difference bypass structure is provided between the cooling water supply and return pipelines. Due to the limitation of the minimum cooling water inlet temperature of the chiller unit, the circulating water temperature at the first connection point A must be ≥19℃.

[0021] In the process cooling water system 2, there are two sets of process heat exchangers 21 and two pumps in the process cooling water circulation pump set 22. It also includes auxiliary valve components. One side of the process heat exchanger 21 is medium-temperature chilled water with a supply and return water temperature of 15℃ / 20℃, and the other side has a supply and return temperature of 16℃ / 21℃.

[0022] The temperature sensor 41 is set up to facilitate monitoring of changes in the outlet water temperature of cooling tower 11. The electric valves 51 and 52 are set up to regulate the water flow through the intermediate heat exchanger 3. When the outlet water temperature of cooling tower 11 is lower than the set value, electric valve 52 is closed or partially closed, and electric valve 51 is opened. At this time, the low-temperature cooling water returning from cooling tower 11 is pumped by cooling circulation pump group 12, and part of the cooling water enters the intermediate heat exchanger 3. After heat exchange, it returns to the cooling pipe after electric valve 52 and then flows into chiller unit 13 to continue heat exchange.

[0023] On the process cooling water usage side, the C electric valve 53 and D electric valve 54 corresponding to one set of process heat exchangers 21 are closed and opened respectively. At this time, the process cooling water returning from the end (process intermediate temperature cooling water return end 62) passes through the second connection point B, the fifth connection point E (or the third connection point C, the fourth connection point D), the corresponding D electric valve 54, the intermediate heat exchanger 3, the E electric valve 55, and then through the sixth connection point F (or the seventh connection point G), the corresponding process heat exchanger 21, and the process cooling water circulation pump group 22, and is supplied to the end (process intermediate temperature cooling water supply end 61).

[0024] The specific installation location of the electric valve is as follows:

[0025] Electric valve 51 has its inlet connected to the tenth connection point J on the pipeline, and its outlet connected to the low-temperature side inlet of intermediate heat exchanger 3; the low-temperature side outlet of intermediate heat exchanger 3 is connected to the eleventh connection point K on the cooling water pipeline.

[0026] Electric valve 52 is located between the tenth connection point J and the eleventh connection point K. The inlet is connected to the tenth connection point J, and the outlet is connected to the eleventh connection point K.

[0027] The inlet pipe of the intermediate heat exchanger 3 on the process cooling water side is connected to the outlet of the two D electric valves 54, and the outlet pipe is connected to the sixth connection point F and the seventh connection point G on the inlet pipe of the original process heat exchanger 21.

[0028] Two C electric valves 53 are located on the inlet pipes of the cooling side of the two process heat exchangers 21 respectively. The inlet of one C electric valve 53 is connected to the fifth connection point E, and the outlet is connected to the process heat exchanger 3. The inlet of the other C electric valve 53 is connected to the fourth connection point D, and the outlet is connected to the process heat exchanger 3.

[0029] One electric valve 54 has its inlet connected to the fifth connection point E and its outlet connected to the process cooling water inlet of the intermediate heat exchanger 3; another electric valve 54 has its inlet connected to the fourth connection point D and its outlet connected together with the outlet of the first electric valve 54 to the process cooling water inlet of the intermediate heat exchanger 3.

[0030] Temperature sensors 42 (B) are installed at both the low-temperature and high-temperature inlet and outlet of the intermediate heat exchanger 3 to monitor the temperature of the low-temperature cooling water and the process cooling water.

[0031] During operation, when the outlet water temperature of cooling tower 11 in the refrigeration station is below 18℃ (temperature adjustable), the intermediate heat exchanger 3 heat exchange system is activated, using the low-temperature outlet water from cooling tower 11 to cool the 21℃ process cooling water. When the outlet water temperature of cooling tower 11 is above 18℃, the refrigeration system and the process cooling tower water system operate independently.

[0032] The intermediate heat exchanger 3 uses 15°C low-temperature water on the cooling side to cool the 21°C return water on the process side. After the heat exchange, the temperature on the cooling side rises to 20°C and enters the chiller unit 13. The temperature of the circulating water on the process side drops to 16°C and is sent to the end of use.

[0033] All of the components described above are existing technologies, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A thermal coupling system for a refrigeration station system and a process cooling water system, characterized in that, The system includes a refrigeration station system (1), an intermediate heat exchanger (3), and a process cooling water system (2) connected sequentially by pipes. The refrigeration station system (1) includes a cooling tower (11), a cooling circulation pump group (12), and a chiller unit (13). The inlet of the cooling tower (11) is connected to the outlet of the chiller unit (13) via a pipe. The outlet of the cooling tower (11) is connected to the inlet of the cooling circulation pump group (12) via a pipe. The outlet of the cooling circulation pump group (12) is connected to the inlet of one side of the intermediate heat exchanger (3) and the inlet of the chiller unit (13) via pipes equipped with electric valves A (51) and B (52), respectively. The pipe between the outlet of the cooling tower (11) and the inlet of the cooling circulation pump group (12) bypasses the pipe between the inlet of the cooling tower (11) and the outlet of the chiller unit (13). The outlet of one side of the intermediate heat exchanger bypasses the pipe between the electric valve B (52) and the inlet of the chiller unit (13). The process cooling water system (2) The intermediate heat exchanger (3) includes a process heat exchanger (21) and a process cooling water circulation pump group (22). The outlet on the other side of the intermediate heat exchanger (3) is connected to the inlet on the other side of the process heat exchanger (21) through a pipe with an electric valve E (55). The outlet on the other side of the process heat exchanger (21) is connected to the inlet of the process cooling water circulation pump group (22) through a pipe. The outlet of the process cooling water circulation pump group (22) is connected to the process intermediate temperature cooling water supply end (61) through a pipe. The process intermediate temperature cooling water return end (62) is connected to the pipe between the outlet on the other side of the intermediate heat exchanger (3) and the inlet on the other side of the process heat exchanger (21) through a pipe with an electric valve C (53). The inlet on the other side of the intermediate heat exchanger (3) is connected to the pipe between the electric valve C (53) and the process intermediate temperature cooling water return end (62) through a pipe with an electric valve D (54). The outlet and inlet on one side of the process heat exchanger (21) are connected to the HVAC chilled water manifold (63) through pipes.

2. The cooling station system and process cooling water system thermal coupling system as described in claim 1, characterized in that, The outlet of the cooling circulation pump group (12) is equipped with a temperature sensor A (41), and the inlet and outlet of the intermediate heat exchanger (3) are equipped with temperature sensors B (42).

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