CN107576123A - Low-temperature circulating system - Google Patents

Abstract

The low-temperature circulation system provided by the present invention includes a refrigeration cycle module, a load-cooling cycle module and a control module, and the load-cooling cycle module includes: a first booster tank, a first valve, a second valve, a third valve, and a fourth valve , a first heat exchanger, a fifth valve, a second heat exchanger, and a second pressurized tank; the refrigeration cycle module is connected to the first heat exchanger through the fifth valve; the control module is connected to The first pressurized tank, the second pressurized tank, the first valve, the second valve, the third valve, and the fourth valve, the low-temperature circulation system provided by the present invention, the control module controls the pressurized tank by The pressure of the first booster tank and the second booster tank realizes the circulating flow of the brine between the first booster tank and the second booster tank. By adjusting different brines, -60 The low-temperature refrigeration cycle in the temperature range below ℃, the low-temperature cycle system provided by the present invention can avoid the unreliable low-flow low-temperature cycle pump in this temperature range, and the cooling cycle has no moving parts, and has the characteristics of energy saving and stable operation.

Description

A low temperature circulation system

technical field

The invention relates to the technical field of refrigeration and energy saving, in particular to a low-temperature circulation system.

Background technique

In the fields of scientific research, medical treatment and industrial production, there is often a demand for refrigeration through brine. For example, in some low-temperature operations, it is often necessary to perform local low-temperature treatment on organs or tissues (even up to -60~-100°C). A technical solution that requires a cooling cycle. However, the reality is that in the temperature range below -60°C, there is a lack of reliable, commercial small-flow circulating pumps, and it is difficult to miniaturize the submersible pumps and plunger pumps commonly used in the field of natural gas liquefaction. For this reason, there is an urgent need to develop a reliable new cooling cycle refrigeration system.

Contents of the invention

In view of this, it is necessary to provide a low-temperature circulation system without a pump to address the defects in the prior art.

To achieve the above object, the present invention adopts the following technical solutions:

A low temperature circulation system,

It includes a refrigeration cycle module, a load-cooling cycle module and a control module; the load-cooling cycle module includes: a first pressurized tank, a first valve, a second valve, a third valve, a fourth valve, a first heat exchanger, a second Five valves, a second heat exchanger, and a second booster tank; the refrigeration cycle module is connected to the first heat exchanger through the fifth valve; the control module is connected to the first booster tank, The second booster tank, the first valve, the second valve, the third valve, and the fourth valve; wherein:

The brine passes through the liquid outlet of the first pressurized tank, passes through the first valve, enters the inlet of the first flow passage of the brine of the first heat exchanger, and then passes through the first flow passage of the first heat exchanger The outlet enters the brine inlet of the second heat exchanger through the third valve, and then enters the brine outlet of the second heat exchanger through the fourth valve into the brine of the first heat exchanger. The brine second flow channel inlet, and then through the brine second flow channel outlet of the first heat exchanger, enter the liquid inlet of the second booster tank through the second valve;

The liquid outlet of the first booster tank is also a liquid inlet, and the liquid outlet of the second booster tank is also a liquid inlet.

In some preferred embodiments, the refrigeration cycle module is one of liquid nitrogen evaporative refrigeration, gas throttling refrigeration, Stirling refrigeration and pulse tube refrigeration.

In some preferred embodiments, the pipeline of the refrigeration cycle module flows from the tube side of the first heat exchanger, and the first flow path of the brine flows from the tube side of the first heat exchanger Flow, the second channel of brine flows from the tube side of the first heat exchanger.

In some preferred embodiments, the piping of the refrigeration cycle module flows from the shell side of the first heat exchanger, the first flow path of the brine and the second flow path of the brine Flow from the tube side of the first heat exchanger.

In some preferred embodiments, the pipeline of the refrigeration cycle module flows from the tube side of the first heat exchanger, and the first flow path of the brine flows from the tube side of the first heat exchanger Flow, the second channel of brine flows from the tube side of the first heat exchanger.

In some preferred embodiments, the refrigeration cycle module includes a liquid nitrogen tank and an environmental unit connected to the liquid nitrogen tank, and the environmental unit is composed of several refrigeration valves and resistance elements connected in series with the refrigeration valves in parallel , the environmental unit is connected to the first heat exchanger through the fifth valve.

In some preferred embodiments, the first heat exchanger is filled with cold storage material, and the cold storage material is a phase change cold storage material or a non-phase change cold storage material, and the phase change cold storage material has a freezing point at the The solid-liquid phase change material in the temperature-requiring area, and the non-phase-change cold storage material is a stainless steel plate or an aluminum plate.

In some preferred embodiments, the first pressurized tank and the second pressurized tank have the same structure, and the first pressurized tank and the second pressurized tank are pressurized with helium.

In some preferred embodiments, the control module is connected to the helium inlet valves of the first booster tank and the second booster tank, and the control module controls the first booster tank and the second booster tank The boost tank pressure enables the brine to circulate between the first boost tank and the second boost tank.

In some preferred embodiments, the brine is at least one of ethanol, methane, ethane and propane.

The present invention adopts the advantage of above-mentioned technical scheme to be:

The low-temperature circulation system provided by the present invention includes a refrigeration cycle module, a load-cooling cycle module and a control module, and the load-cooling cycle module includes: a first pressurized tank, a first valve, a second valve, a third valve, and a fourth valve , a first heat exchanger, a fifth valve, a second heat exchanger, and a second pressurized tank; the refrigeration cycle module is connected to the first heat exchanger through the fifth valve; the control module is connected to The first pressurized tank, the second pressurized tank, the first valve, the second valve, the third valve, and the fourth valve, the low-temperature circulation system provided by the present invention, the control module controls the pressurized tank by The pressure of the first booster tank and the second booster tank realizes the circulating flow of the brine between the first booster tank and the second booster tank. By adjusting different brines, -60 For the low-temperature refrigeration cycle in the temperature range below ℃, the low-temperature cycle system provided by the invention can avoid the unreliable low-flow low-flow low-temperature cycle pump in this temperature range. At the same time, the cooling cycle has no moving parts, and has the characteristics of energy saving and stable operation.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a low-temperature circulation system provided by an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the first heat exchanger (HX1) provided by a preferred embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the first heat exchanger (HX1) provided by another preferred embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a refrigeration cycle module provided by a preferred embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to FIG. 1 , the low-temperature cycle system 10 provided by the present invention includes a refrigeration cycle module 100 , a refrigerated cycle module (C) 200 and a control module (R) 300 . The load cooling cycle module 200 includes: a first pressurized tank (PV1) 211, a first valve (V1) 212, a second valve (V2) 213, a third valve (V3) 214, and a fourth valve (V4) 215 , the first heat exchanger (HX1) 216, the fifth valve (V5) 217, the second heat exchanger (HX2) 218, and the second booster tank (PV2) 219. The refrigeration cycle module 100 is connected to the first heat exchanger (HX1) 216 through the fifth valve (V5) 217 . The control module 300 is connected to the first boost tank (PV1) 211, the second boost tank (PV2) 219, the first valve (V1) 212, the second valve (V2) 213, the third valve (V3 ) 214, the fourth valve (V4) 215.

Specifically, the brine enters the brine first channel inlet of the first heat exchanger through the liquid outlet of the first booster tank through the first valve, and then passes through the first flow channel inlet of the first heat exchanger. The outlet of the first flow channel enters the brine inlet of the second heat exchanger through the third valve, and then enters the first heat exchanger through the fourth valve through the brine outlet of the second heat exchanger. The inlet of the second flow path of the brine of the heat exchanger, and then through the outlet of the second flow path of the brine of the first heat exchanger, enter the liquid inlet of the second booster tank through the second valve;

Specifically, the brine enters the brine first channel of the first heat exchanger (HX1) 216 through the liquid outlet of the first booster tank (PV1) 211 through the first valve (V1) 212 inlet, and then through the outlet of the first channel of the first heat exchanger (HX1) 216 to enter the brine inlet of the second heat exchanger (HX2) 218 through the third valve (V3) 214, and then through The brine outlet of the second heat exchanger (HX2) 218 enters the brine second channel inlet of the first heat exchanger (HX1) 216 through the fourth valve (V4) 215, and then passes through The outlet of the brine second flow path of the first heat exchanger (HX1) 216 enters the liquid inlet of the second booster tank (PV2) 219 through the second valve (V2) 213 .

It can be understood that the liquid outlet of the first booster tank (PV1) 211 is also a liquid inlet, and the liquid outlet of the second booster tank (PV2) 219 is also a liquid inlet.

It can be understood that the brine is a pure substance or a mixture that does not produce solids in the use temperature range, specifically at least one of ethanol, methane, ethane, and propane. It can be understood that, in practice, the above-mentioned brine is not limited to the above-mentioned brine, and those skilled in the art can also select other suitable brine according to the target temperature of the low temperature.

Please refer to FIG. 1 again, which shows a schematic structural diagram of the first heat exchanger ( HX1 ) 216 provided by a preferred embodiment of the present invention.

Specifically, the pipeline of the refrigeration cycle module 100 flows from the tube side of the first heat exchanger (HX1) 216, and the first channel of the brine flows from the first heat exchanger (HX1) 216 The tube side of the brine flows, and the second channel of the brine flows from the tube side of the first heat exchanger (HX1) 216.

Please refer to FIG. 2 , which is a schematic structural diagram of the first heat exchanger ( HX1 ) 216 provided in another preferred embodiment of the present invention.

Specifically, the pipeline of the refrigeration cycle module 100 flows from the shell side of the first heat exchanger (HX1) 216, and the first flow path of the brine and the second flow path of the brine flow from The tube side of the first heat exchanger (HX1) 216 flows.

Please refer to FIG. 3 , which is a schematic structural diagram of the first heat exchanger ( HX1 ) 216 provided in another preferred embodiment of the present invention.

The pipeline of the refrigeration cycle module 100 flows from the tube side of the first heat exchanger (HX1) 216, and the first flow channel of the brine flows from the tube side of the first heat exchanger (HX1) 216 The second channel of the brine flows from the tube side of the first heat exchanger (HX1) 216.

It can be understood that the first heat exchanger (HX1) 216 provided in FIG. 1, FIG. 2 and FIG. The cold storage material is a solid-liquid phase change material whose freezing point is in the required temperature range, and the non-phase change cold storage material is a stainless steel plate or an aluminum plate.

In some preferred embodiments, the refrigeration cycle module 100 is one of liquid nitrogen evaporative refrigeration, gas throttling refrigeration, Stirling refrigeration and pulse tube refrigeration.

Please refer to FIG. 4 , which is a schematic structural diagram of a refrigeration cycle module 100 provided in a preferred embodiment of the present invention. It can be understood that a specific structural form in which the refrigeration cycle module 100 is liquid nitrogen evaporative refrigeration is given here.

Wherein, the refrigeration cycle module 100 includes a liquid nitrogen tank 110 and an environmental unit 120 connected to the liquid nitrogen tank 110, the environmental unit 120 is composed of several refrigeration valves 121 and resistance elements 122 connected in series with the refrigeration valves 121 in parallel to form a As a result, the environmental unit 120 is connected to the first heat exchanger (HX1) 216 through the fifth valve (V5) 217 .

In some preferred embodiments, the structure of the first booster tank (PV1) 211 and the second booster tank (PV2) 219 is the same, and the first booster tank (PV1) 211 and the second booster tank (PV1) 211 Pressure tank (PV2) 219 adopts helium gas pressurization method.

Specifically, the control module 300 is connected to the helium inlet valves of the first pressurized tank and the second pressurized tank, as well as the first valve (V1) 212, the second valve (V2) 213, the third valve ( V3) 214, fourth valve (V4) 215, the control module 300 controls the pressure of the first pressurized tank (PV1) 211 and the second pressurized tank (PV2) 219 to realize the brine in the The circulating flow between the first pressurized tank (PV1) 211 and the second pressurized tank (PV2) 219.

The working mode of the cryogenic circulation system 10 provided by the present invention can be divided into the following two stages.

First stage: the control module 300 controls the first valve (V1) 212, the second valve (V2), the third valve (V3) 214, and the fourth valve (V4) 215 to open the first pressurized tank (PV1 ) 211 is pressurized to 0.3MPa by helium, the helium in the second pressurization tank (PV2) 219 is pressurized to 0.2MPa, and the refrigeration cycle module 100 cools the brine (methane or a mixture of methane) to -180°C , because there is a pressure difference between the two pressurized tanks, the flow between the two pressurized tanks is realized, and when the first pressurized tank (PV1) 211 liquid remains 10%, the second-stage control is started.

In the second stage, the opening of the first valve (V1) 212, the second valve (V2), the third valve (V3) 214, and the fourth valve (V4) 215, the first pressurized tank (PV1) 211 passes helium The pressure is adjusted to 0.2MPa, the helium in the second booster tank (PV2) 219 is boosted to 0.3MPa, and the refrigeration cycle module 100 cools the brine (methane or a mixture of methane) to -180°C. There is a pressure differential between the tanks, enabling flow between the two pressurized tanks. When 10% of the liquid in the second pressurized tank PV1 remains, the first-stage control is restarted, and the cycle repeats like this.

Of course, the low-temperature circulation system of the present invention can also have various transformations and modifications, and is not limited to the specific structure of the above-mentioned embodiment. In a word, the protection scope of the present invention shall include those transformations, substitutions and modifications obvious to those skilled in the art.

Claims (9)

1. A low-temperature cycle system, characterized in that it includes a refrigeration cycle module, a load-cooling cycle module and a control module; the load-cooling cycle module includes: a first pressurized tank, a first valve, a second valve, and a third valve , the fourth valve, the first heat exchanger, the fifth valve, the second heat exchanger and the second pressurized tank; the refrigeration cycle module is connected to the first heat exchanger through the fifth valve; the The control module is connected to the first pressurized tank, the second pressurized tank, the first valve, the second valve, the third valve, and the fourth valve; wherein: The brine passes through the liquid outlet of the first pressurized tank, passes through the first valve, enters the inlet of the first flow passage of the brine of the first heat exchanger, and then passes through the first flow passage of the first heat exchanger The outlet enters the brine inlet of the second heat exchanger through the third valve, and then enters the brine outlet of the second heat exchanger through the fourth valve into the brine of the first heat exchanger. The brine second flow channel inlet, and then through the brine second flow channel outlet of the first heat exchanger, enter the liquid inlet of the second booster tank through the second valve; The liquid outlet of the first booster tank is also a liquid inlet, and the liquid outlet of the second booster tank is also a liquid inlet. 2. The low-temperature cycle system according to claim 1, wherein the refrigeration cycle module is one of liquid nitrogen evaporative refrigeration, gas throttling refrigeration, Stirling refrigeration and pulse tube refrigeration. 3. The low-temperature cycle system according to claim 2, wherein the pipeline of the refrigeration cycle module flows from the tube side of the first heat exchanger, and the first flow path of the brine flows from the tube side of the first heat exchanger. The tube side of the first heat exchanger flows, and the second channel of brine flows from the tube side of the first heat exchanger. 4. The low-temperature cycle system according to claim 2, wherein the pipeline of the refrigeration cycle module flows from the shell side of the first heat exchanger, and the first flow path of the brine and the The second channel of brine flows from the tube side of the first heat exchanger. 5. The low-temperature cycle system according to claim 2, wherein the pipeline of the refrigeration cycle module flows from the tube side of the first heat exchanger, and the first flow path of the brine flows from the tube side of the first heat exchanger. The tube side of the first heat exchanger flows, and the second channel of brine flows from the tube side of the first heat exchanger. 6. The low-temperature cycle system according to claim 3, 4, or 5, wherein the refrigeration cycle module includes a liquid nitrogen tank and an environmental unit connected to the liquid nitrogen tank, and the environmental unit is composed of several refrigeration valves and The resistance element connected in series with the cooling valve is connected in parallel, and the environmental unit is connected to the first heat exchanger through the fifth valve. 7. The low-temperature circulation system according to claim 1, wherein the first heat exchanger is filled with cold storage material, and the cold storage material is a phase change cold storage material or a non-phase change cold storage material, and the cold storage material is a phase change cold storage material. The phase-change cold storage material is a solid-liquid phase-change material whose freezing point is in a required temperature range, and the non-phase-change cold storage material is a stainless steel plate or an aluminum plate. 8. The cryogenic circulation system according to claim 1, wherein the first booster tank and the second booster tank have the same structure, and the first booster tank and the second booster tank use helium supercharging mode. 9. The low-temperature cycle system according to claim 8, wherein the control module realizes the pressure of the brine in the first pressurization tank by controlling the pressure of the first pressurization tank and the second pressurization tank. Circulation flow between the tank and the second pressurized tank.