阅读说明：本技术 一种大温差低温冷却循环系统 (Large-temperature-difference low-temperature cooling circulation system ) 是由 程林 孙皓 谭江峰 薛米米 李仕黛 于 2019-11-29 设计创作，主要内容包括：本发明提供了一种大温差低温冷却循环系统,包括一次循环回路和二次循环回路,一次循环回路和二次循环回路通过中间换热器传递热量；一次循环回路包括第一用冷设备、第二用冷设备、第一缓冲罐、一次回路循环泵、二次回路流量计；二次循环回路包括第二缓冲罐、二次回路循环泵、低温离心式冷水机组；低温离心式冷水机组还连接冷机冷却水出水管和冷机冷却水进水管,冷机冷却水出水管上设置有冷机冷却水出水阀,冷机冷却水进水管上设置有冷机冷却水进水阀。本发明提供的一种大温差低温冷却循环系统,可有效解决低温离心式冷水机组无法直接提供15.5℃甚至更大的换热温差的难题,本系统设计简单、操作方便、稳定可靠、易于安装及清洁维护。(The invention provides a large-temperature-difference low-temperature cooling circulating system which comprises a primary circulating loop and a secondary circulating loop, wherein the primary circulating loop and the secondary circulating loop transfer heat through an intermediate heat exchanger; the primary circulation loop comprises first cooling equipment, second cooling equipment, a first buffer tank, a primary circulation pump and a secondary circulation flowmeter; the secondary circulation loop comprises a second buffer tank, a secondary loop circulating pump and a low-temperature centrifugal water chilling unit; the low-temperature centrifugal water chilling unit is also connected with a cold machine cooling water outlet pipe and a cold machine cooling water inlet pipe, a cold machine cooling water outlet valve is arranged on the cold machine cooling water outlet pipe, and a cold machine cooling water inlet valve is arranged on the cold machine cooling water inlet pipe. The large-temperature-difference low-temperature cooling circulation system provided by the invention can effectively solve the problem that a low-temperature centrifugal water chilling unit cannot directly provide a heat exchange temperature difference of 15.5 ℃ or even more, and has the advantages of simple design, convenience in operation, stability, reliability, easiness in installation, cleaning and maintenance.)

1. The large-temperature-difference low-temperature cooling circulating system is characterized by comprising a primary circulating loop and a secondary circulating loop, wherein the primary circulating loop and the secondary circulating loop transfer heat through an intermediate heat exchanger (13);

the primary circulation loop comprises first cooling equipment (25), second cooling equipment (27), a first buffer tank (22), a primary loop circulating pump (20) and a secondary loop flowmeter (29), wherein the first cooling equipment (25) is connected with the first buffer tank (22) through a first cooling equipment water outlet pipe (23), a first cooling equipment water outlet valve (24) is arranged on the first cooling equipment water outlet pipe (23), the first buffer tank (22) is connected with the primary loop circulating pump (20) through a primary loop circulating valve (21), the primary loop circulating pump (20) is connected with the intermediate heat exchanger (13) through an intermediate heat exchanger primary loop water inlet pipe (19), and an intermediate heat exchanger primary loop water inlet valve (18) is arranged on the intermediate heat exchanger primary loop water inlet pipe (19); the first cooling equipment (25) is connected with second cooling equipment (27) through a second cooling equipment water outlet pipe (26), the second cooling equipment (27) is connected with a secondary circuit flowmeter (29) through a second cooling equipment water inlet pipe (28), the secondary circuit flowmeter (29) is connected with the intermediate heat exchanger (13) through an intermediate heat exchanger primary circuit water outlet valve (30), the second cooling equipment water inlet pipe (28) is further connected with the first buffer tank (22) through a primary circuit adjusting pipe (31), and a primary circuit adjusting valve (32) is arranged on the primary circuit adjusting pipe (31);

the secondary circulation loop comprises a second buffer tank (10), a secondary loop circulating pump (8) and a low-temperature centrifugal water chiller unit (3), the second buffer tank (10) is connected with an intermediate heat exchanger (13) through an intermediate heat exchanger secondary loop water outlet pipe (11), an intermediate heat exchanger secondary loop water outlet valve (12) is arranged on the intermediate heat exchanger secondary loop water outlet pipe (11), the second buffer tank (10) is connected with the secondary loop circulating pump (8) through a secondary loop circulating valve (9), the secondary loop circulating pump (8) is connected with the low-temperature centrifugal water chiller unit (3) through a chilled water inlet pipe (7), a chilled water inlet valve (6) of the chiller is arranged on the chilled water inlet pipe (7), and the low-temperature centrifugal water chiller unit (3) is connected with the intermediate heat exchanger (13) through an intermediate heat exchanger secondary loop water inlet pipe (14), an intermediate heat exchanger secondary loop water inlet valve (15) is arranged on the intermediate heat exchanger secondary loop water inlet pipe (14), the intermediate heat exchanger secondary loop water inlet pipe (14) is also connected with the second buffer tank (10) through a secondary loop adjusting pipe (16), and a secondary loop adjusting valve (17) is arranged on the secondary loop adjusting pipe (16);

the low-temperature centrifugal water chilling unit (3) is further connected with a cold machine cooling water outlet pipe (5) and a cold machine cooling water inlet pipe (1), a cold machine cooling water outlet valve (4) is arranged on the cold machine cooling water outlet pipe (5), and a cold machine cooling water inlet valve (2) is arranged on the cold machine cooling water inlet pipe (1).

2. The large temperature difference cryogenic cooling circulation system according to claim 1, wherein the intermediate heat exchanger (3) is a large temperature difference intermediate heat exchanger, and the large temperature difference intermediate heat exchanger is a plate type heat exchange enhanced large temperature difference intermediate heat exchanger.

3. The large temperature difference cryogenic cooling circulation system according to claim 1, wherein the number of the primary circuit circulation pumps (20) is two, and when any one of the primary circuit circulation pumps (20) is in the use state, the other primary circuit circulation pump (20) is in the standby state.

4. The high temperature difference cryogenic cooling circulation system according to claim 1, wherein the number of the secondary circuit circulation pumps (8) is three, and when any two of the secondary circuit circulation pumps (8) are in use, the other secondary circuit circulation pump (8) is in standby.

5. The large temperature difference cryogenic cooling circulation system according to claim 1, wherein the temperature of the primary circulation loop is-4.5 ℃ to-20 ℃, and the temperature of the secondary circulation loop is-17 ℃ to-23 ℃.

6. The large temperature difference cryogenic cooling circulation system according to claim 1, wherein the primary loop regulating valve (32) and the secondary loop regulating valve (17) are self-regulating valves.

7. The large temperature difference cryogenic cooling circulation system according to claim 6, wherein the primary loop regulating valve (32) is used for automatically controlling and regulating the flow and the temperature of the primary circulation loop, and the secondary loop regulating valve (17) is used for automatically controlling and regulating the flow and the temperature of the secondary circulation loop.

8. The large-temperature-difference low-temperature cooling circulating system as claimed in claim 1, wherein the cold machine cooling water inlet pipe (1), the cold machine cooling water inlet valve (2), the cold machine cooling water outlet valve (4) and the cold machine cooling water outlet pipe (5) are used for reducing the heat of the low-temperature centrifugal water chilling unit (3).

Technical Field

The invention relates to a cooling circulation system, in particular to a large-temperature-difference low-temperature cooling circulation system.

Background

At present, low-temperature centrifugal water chilling units are generally adopted in petrochemical, pharmaceutical, food freezing and refrigerating and other industries at home and abroad to realize low-temperature cooling and environmental control of a process flow, and a low-temperature cooling circulation system is used as the most important link in the process flow and plays a vital role in the efficient and reliable aspects of system operation. In the related field with a low-temperature cooling circulation system, a process flow mode of comprehensively utilizing the temperature gradient of a cold source in series is usually adopted by a cooled unit or a tail end cold-using device, so that the heat exchange requirement of large temperature difference is provided for the whole low-temperature cooling circulation system. In the conventional low-temperature cooling circulation system, a plurality of low-temperature units can only be connected in series to run, so that the large-temperature-difference refrigeration and heat exchange of the whole system are realized in a mode of reducing the refrigeration temperature in series, or the difficult problem of large temperature difference is avoided in a mode of connecting a cooled unit or tail-end cold equipment in parallel in the system. At present, the two schemes have the phenomena of very high energy consumption and energy saving of the whole system, the overall development trend of current green energy saving cannot be completely met, and the energy consumption phenomena often occur in low-temperature cooling circulation systems in the fields of biological pharmacy, chemical process flows and the like, so that serious resource waste is caused.

Disclosure of Invention

The invention provides a large-temperature-difference low-temperature cooling circulation system which can effectively solve the problem that a low-temperature centrifugal water chilling unit cannot directly provide 15.5 ℃ or even larger heat exchange temperature difference because a first cooling device and a second cooling device can realize 15.5 ℃ or even larger heat exchange temperature difference when the low-temperature centrifugal water chilling unit keeps 5 ℃ or smaller temperature difference in the actual operation and adjustment of the large-temperature-difference low-temperature cooling system. The system has the advantages of simple design, convenient operation, stability, reliability, easy installation, cleaning and maintenance.

The invention adopts the following technical scheme:

a large-temperature-difference low-temperature cooling circulating system comprises a primary circulating loop and a secondary circulating loop, wherein heat is transferred between the primary circulating loop and the secondary circulating loop through an intermediate heat exchanger;

the primary circulation loop comprises first cooling equipment, second cooling equipment, a first buffer tank, a primary loop circulating pump and a secondary loop flowmeter, wherein the first cooling equipment is connected with the first buffer tank through a first cooling equipment water outlet pipe; the first cooling equipment is connected with second cooling equipment through a second cooling equipment water outlet pipe, the second cooling equipment is connected with a secondary loop flowmeter through a second cooling equipment water inlet pipe, the secondary loop flowmeter is connected with the intermediate heat exchanger through an intermediate heat exchanger primary loop water outlet valve, the second cooling equipment water inlet pipe is connected with the first buffer tank through a primary loop regulating pipe, and the primary loop regulating pipe is provided with a primary loop regulating valve;

the secondary circulation loop comprises a second buffer tank, a secondary loop circulating pump and a low-temperature centrifugal water chilling unit, the second buffer tank is connected with the intermediate heat exchanger through an intermediate heat exchanger secondary loop water outlet pipe, an intermediate heat exchanger secondary loop water outlet valve is arranged on the intermediate heat exchanger secondary loop water outlet pipe, the second buffer tank is connected with the secondary loop circulating pump through a secondary loop circulating valve, the secondary loop circulating pump is connected with the low-temperature centrifugal water chilling unit through a cold machine freezing water inlet pipe, a cold machine freezing water inlet valve is arranged on the cold machine freezing water inlet pipe, the low-temperature centrifugal water chilling unit is connected with the intermediate heat exchanger through an intermediate heat exchanger secondary loop water inlet pipe, an intermediate heat exchanger secondary loop water inlet valve is arranged on the intermediate heat exchanger secondary loop water inlet pipe, the intermediate heat exchanger secondary loop water inlet pipe is connected with the second buffer tank through, a secondary loop regulating valve is arranged on the secondary loop regulating pipe;

the low-temperature centrifugal water chilling unit is also connected with a cold machine cooling water outlet pipe and a cold machine cooling water inlet pipe, a cold machine cooling water outlet valve is arranged on the cold machine cooling water outlet pipe, and a cold machine cooling water inlet valve is arranged on the cold machine cooling water inlet pipe.

Further, the intermediate heat exchanger is a large-temperature-difference intermediate heat exchanger, and the large-temperature-difference intermediate heat exchanger is a plate-type enhanced heat exchange type large-temperature-difference intermediate heat exchanger.

Further, the number of the primary circuit circulating pumps is two, and when any one of the primary circuit circulating pumps is in a use state, the other primary circuit circulating pump is in a standby state.

Further, the number of the secondary circuit circulating pumps is three, and when any two secondary circuit circulating pumps are in a use state, the other secondary circuit circulating pump is in a standby state.

Further, the temperature of the primary circulation loop is-4.5 ℃ to-20 ℃, and the temperature of the secondary circulation loop is-17 ℃ to-23 ℃.

Further, the primary circuit regulating valve and the secondary circuit regulating valve are regulating valves capable of being automatically regulated.

Further, the primary loop regulating valve is used for automatically controlling and regulating the flow and the temperature of the primary circulation loop, and the secondary loop regulating valve is used for automatically controlling and regulating the flow and the temperature of the secondary circulation loop.

Furthermore, the cold machine cooling water inlet pipe, the cold machine cooling water inlet valve, the cold machine cooling water outlet valve and the cold machine cooling water outlet pipe are used for reducing the heat of the low-temperature centrifugal water chilling unit.

The invention has the beneficial effects that:

(1) the large-temperature-difference low-temperature cooling circulation system can effectively solve the problem that a low-temperature centrifugal water chilling unit cannot directly provide 15.5 ℃ or even larger heat exchange temperature difference because the first cooling equipment and the second cooling equipment have 15.5 ℃ or even larger heat exchange temperature difference when the low-temperature centrifugal water chilling unit keeps 5 ℃ or smaller temperature difference in the actual operation and adjustment of the large-temperature-difference low-temperature cooling system.

(2) The secondary circuit regulating valve and the primary circuit regulating valve are automatically regulated during operation, so that the large-scale temperature and flow regulating function of the system can be realized, and the flow and temperature operation of the system are more stable and reliable.

(3) Meanwhile, the system has a certain cold accumulation effect in the system operation by arranging the first buffer tank and the second buffer tank, so that the economical and energy-saving operation of the system is ensured.

(4) The system has the advantages of simple design, convenient operation, stability, reliability, easy installation, cleaning and maintenance.

Drawings

Fig. 1 is a schematic structural diagram of a large temperature difference cryogenic cooling circulation system according to the present invention.

In the attached drawing, a cold machine cooling water inlet pipe 1, a cold machine cooling water inlet valve 2, a low-temperature centrifugal cold water unit 3, a cold machine cooling water outlet valve 4, a cold machine cooling water outlet pipe 5, a cold machine cooling water inlet valve 6, a cold machine cooling water inlet pipe 7, a secondary loop circulating pump 8, a secondary loop circulating valve 9, a second buffer tank 10, an intermediate heat exchanger secondary loop water outlet pipe 11, an intermediate heat exchanger secondary loop water outlet valve 12, an intermediate heat exchanger 13, an intermediate heat exchanger secondary loop water inlet pipe 14, an intermediate heat exchanger secondary loop water inlet valve 15, a secondary loop adjusting pipe 16, a secondary loop adjusting valve 17, an intermediate heat exchanger primary loop water inlet valve 18, an intermediate heat exchanger primary loop water inlet pipe 19, a primary loop circulating pump 20, a primary loop 21, a first buffer tank 22, a first cold equipment water outlet pipe 23, a first cold equipment water outlet valve 24, a second cooling device water outlet pipe 26, a second cooling device 27, a second cooling device water inlet pipe 28, a secondary circuit flowmeter 29, an intermediate heat exchanger primary circuit water outlet valve 30, a primary circuit adjusting pipe 31 and a primary circuit adjusting valve 32.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The invention provides a scheme of a large-temperature-difference low-temperature cooling circulation system by combining the actual operation and adjustment characteristics of the large-temperature-difference low-temperature cooling system.

As shown in fig. 1, the present invention provides a large temperature difference cryogenic cooling circulation system, which comprises a primary circulation loop and a secondary circulation loop, wherein the primary circulation loop and the secondary circulation loop transfer heat through an intermediate heat exchanger 13, and the intermediate heat exchanger 3 is a plate-type heat-exchange-enhanced large temperature difference intermediate heat exchanger.

The temperature of the primary circulation loop is-4.5 ℃ to-20 ℃, and the primary circulation loop comprises a first cooling device 25, a second cooling device 27, a first buffer tank 22, a primary loop circulating pump 20 and a secondary loop flowmeter 29; the number of primary circuit circulation pumps 20 is two, and when one of the primary circuit circulation pumps 20 is in the use state, the other primary circuit circulation pump 20 is in the standby state. The first cooling equipment 25 is connected with a first buffer tank 22 through a first cooling equipment water outlet pipe 23, a first cooling equipment water outlet valve 24 is arranged on the first cooling equipment water outlet pipe 23, the first buffer tank 22 is connected with a primary loop circulating pump 20 through a primary loop circulating valve 21, the primary loop circulating pump 20 is connected with an intermediate heat exchanger 13 through an intermediate heat exchanger primary loop water inlet pipe 19, and an intermediate heat exchanger primary loop water inlet valve 18 is arranged on the intermediate heat exchanger primary loop water inlet pipe 19; the first cooling equipment 25 is connected with second cooling equipment 27 through a second cooling equipment water outlet pipe 26, the second cooling equipment 27 is connected with a secondary loop flowmeter 29 through a second cooling equipment water inlet pipe 28, the secondary loop flowmeter 29 is connected with the intermediate heat exchanger 13 through an intermediate heat exchanger primary loop water outlet valve 30, the second cooling equipment water inlet pipe 28 is further connected with the first buffer tank 22 through a primary loop adjusting pipe 31, a primary loop adjusting valve 32 is arranged on the primary loop adjusting pipe 31, the primary loop adjusting valve 32 is an automatically adjusting valve, and the primary loop adjusting valve 32 is used for automatically controlling and adjusting the flow and the temperature of the primary loop.

The temperature of the secondary circulation loop is-17 ℃ to-23 ℃, and the secondary circulation loop comprises a second buffer tank 10, a secondary loop circulating pump 8 and a low-temperature centrifugal water chilling unit 3; the number of the secondary circuit circulation pumps 8 is three, and when any two of the secondary circuit circulation pumps 8 are in use, the other secondary circuit circulation pump 8 is in a standby state. The second buffer tank 10 is connected with an intermediate heat exchanger 13 through an intermediate heat exchanger secondary loop water outlet pipe 11, an intermediate heat exchanger secondary loop water outlet valve 12 is arranged on the intermediate heat exchanger secondary loop water outlet pipe 11, the second buffer tank 10 is connected with a secondary loop circulating pump 8 through a secondary loop circulating valve 9, the secondary loop circulating pump 8 is connected with a low-temperature centrifugal water chiller 3 through a cold machine chilled water inlet pipe 7, a cold machine chilled water inlet valve 6 is arranged on the cold machine chilled water inlet pipe 7, the low-temperature centrifugal water chiller 3 is connected with the intermediate heat exchanger 13 through an intermediate heat exchanger secondary loop water inlet pipe 14, an intermediate heat exchanger secondary loop water inlet valve 15 is arranged on the intermediate heat exchanger secondary loop water inlet pipe 14, the intermediate heat exchanger secondary loop water inlet pipe 14 is connected with the second buffer tank 10 through a secondary loop adjusting pipe 16, and a secondary loop adjusting valve 17 is arranged on the, the secondary loop regulating valve 17 is an automatic regulating valve, and the secondary loop regulating valve 17 is used for automatically controlling and regulating the flow and the temperature of the secondary loop.

The low-temperature centrifugal water chilling unit 3 is also connected with a cold machine cooling water outlet pipe 5 and a cold machine cooling water inlet pipe 1, a cold machine cooling water outlet valve 4 is arranged on the cold machine cooling water outlet pipe 5, and a cold machine cooling water inlet valve 2 is arranged on the cold machine cooling water inlet pipe 1; the cold machine cooling water inlet pipe 1, the cold machine cooling water inlet valve 2, the cold machine cooling water outlet valve 4 and the cold machine cooling water outlet pipe 5 are used for reducing the heat of the low-temperature centrifugal cold water unit 3.

In the invention, the primary circulation loop and the secondary circulation loop are two independent low-temperature heat exchange systems. The secondary loop regulating pipe 16 and the secondary loop regulating valve 17, and the primary loop regulating pipe 31 and the primary loop regulating valve 32 respectively realize the respective flow and temperature regulating functions of the two systems in an automatic control and regulation mode in the operation process. The cold machine cooling water inlet pipe 1, the cold machine cooling water inlet valve 2, the cold machine cooling water outlet valve 4 and the cold machine cooling water outlet pipe 5 are mainly connected with a cooling system so as to take away the heat of the condenser of the low-temperature centrifugal water chilling unit 3, and the overall cooling of the system is realized.

The large-temperature-difference low-temperature cooling circulation system can effectively solve the problem that a low-temperature centrifugal water chilling unit cannot directly provide 15.5 ℃ or even larger heat exchange temperature difference because the first cooling equipment and the second cooling equipment have 15.5 ℃ or even larger heat exchange temperature difference when the low-temperature centrifugal water chilling unit keeps 5 ℃ or smaller temperature difference in the actual operation and adjustment of the large-temperature-difference low-temperature cooling system. The secondary circuit regulating valve and the primary circuit regulating valve are automatically regulated during operation, so that the large-scale temperature and flow regulating function of the system can be realized, and the flow and temperature operation of the system are more stable and reliable. Meanwhile, the system has a certain cold accumulation effect in the system operation by arranging the first buffer tank and the second buffer tank, so that the economical and energy-saving operation of the system is ensured. The system has the advantages of simple design, convenient operation, stability, reliability, easy installation, cleaning and maintenance.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.