CN-121993997-A - Cooling circulation system

CN121993997ACN 121993997 ACN121993997 ACN 121993997ACN-121993997-A

Abstract

The embodiment of the application provides a cooling circulation system, which comprises a rectifying tower and a heat exchange pipeline. The heat exchange pipeline comprises a first medium pipeline and a circulating pipeline, wherein the first medium pipeline is used for flowing a first medium, the circulating pipeline is used for flowing a second medium, the circulating pipeline comprises a liquid medium pipeline and a gaseous medium pipeline which are mutually communicated, the rectifying tower is arranged at the communication position of the outlet end of the liquid medium pipeline and the inlet end of the gaseous medium pipeline so as to exchange heat with the second medium in the liquid medium pipeline, and the second medium in the gaseous medium pipeline exchanges heat with the first medium in the first medium pipeline at the communication position of the outlet end of the gaseous medium pipeline and the inlet end of the liquid medium pipeline, wherein the liquefaction temperature of the second medium is higher than that of the first medium. The cooling circulation system provided by the embodiment of the application can reduce the risk of rectifying substances being converted into solids.

Inventors

ZENG JING
YE YIMING
HU SHILIN
QI XIN
CHU CHENGJIE
Ai Lisijia
RUAN HAO

Assignees

中国原子能科学研究院

Dates

Publication Date: 20260508
Application Date: 20260126

Claims (10)

1. A cooling circulation system, characterized by comprising: A rectifying tower; The heat exchange pipeline comprises a first medium pipeline and a circulating pipeline, wherein the first medium pipeline is used for flowing a first medium, the circulating pipeline is used for flowing a second medium, the circulating pipeline comprises a liquid medium pipeline and a gaseous medium pipeline which are mutually communicated, the rectifying tower is arranged at the communication position of the outlet end of the liquid medium pipeline and the inlet end of the gaseous medium pipeline so as to exchange heat with the second medium in the liquid medium pipeline, and the second medium in the gaseous medium pipeline exchanges heat with the first medium in the first medium pipeline at the communication position of the outlet end of the gaseous medium pipeline and the inlet end of the liquid medium pipeline, wherein the liquefaction temperature of the second medium is higher than that of the first medium.
2. The cooling circulation system of claim 1, wherein the cooling circulation system comprises a heat exchanger comprising a first inlet, a first outlet, a second inlet, and a second outlet; the first medium pipeline comprises a liquid supply pipeline and an air outlet pipeline, the liquid supply pipeline is communicated with the first inlet and used for supplying the first medium into the heat exchanger, and the air outlet pipeline is communicated with the first outlet and used for receiving the first medium flowing out of the first outlet; an outlet end of the gaseous medium line communicates with the second inlet for feeding the second medium into the heat exchanger, and an inlet end of the liquid medium line communicates with the second outlet for receiving the second medium flowing out of the second outlet.
3. A cooling circulation system according to claim 2, wherein the first inlet is located on the top side of the second inlet and the second outlet, and/or, The first outlet is located on a top side of the second inlet and the second outlet.
4. A cooling circulation system according to any one of claims 1-3, further comprising a buffer tank and a transfer pump, the buffer tank and the transfer pump being provided on the liquid medium line, and the transfer pump being located between the buffer tank and the rectifying column.
5. The cooling circulation system according to claim 4, wherein the circulation line further includes a liquid medium branch line, one end of the liquid medium branch line is connected to the liquid medium line between the transfer pump and the rectifying tower, the other end of the liquid medium branch line is connected to the buffer tank, and the control valve is provided on the liquid medium branch line.
6. A cooling circulation system according to any one of claims 1-3, characterized in that the cooling circulation system comprises a plurality of the rectifying towers, which are arranged in parallel in the circulation line.
7. The cooling circulation system of claim 2, further comprising a buffer tank and a liquefaction cold tank, the buffer tank being disposed on the liquid medium line, the heat exchanger and the buffer tank being located in the liquefaction cold tank, the rectifying column being located outside the liquefaction cold tank.
8. A cooling circuit according to any one of claims 1 to 3, further comprising a flow meter provided at the outlet end of the liquid medium line, and/or, The cooling circulation system further comprises a pressure monitoring device which is arranged at the outlet end of the liquid medium pipeline and/or, The cooling circulation system further comprises a temperature sensor, and the temperature sensor is arranged at the inlet end of the gaseous medium pipeline.
9. The cooling circulation system according to claim 4, wherein the heat exchange line further includes an air intake line having an outlet end in communication with the gaseous medium line and an outlet end for supplying the second medium, and a drain line in communication with the buffer tank.
10. A cooling circulation system according to any one of claims 1-3, wherein the first medium is nitrogen and the second medium is methane.

Description

Cooling circulation system Technical Field The application relates to the technical field of rectification, in particular to a cooling circulation system. Background High purity boron trifluoride (BF 3) is a widely used gas that is used primarily in the electronics industry as a P-type dopant source for silicon epitaxy, diffusion and ion implantation processes. The boron trifluoride can further separate very important 10BF 3 and 11BF 3 isotope gases, and is widely used in the nuclear industry field and the semiconductor industry. The difficulty of industrial production of the B-10 isotope is great. The cryogenic rectification column is the site for cryogenic rectification separation of boron-10 isotopes. Each low-temperature rectifying tower consists of three parts, namely a condensing section, a rectifying section and a reboiling section. The condensing section is positioned at the top of the rectifying tower and is composed of a condenser, and the condensing section mainly has the function of condensing boron trifluoride vapor rising in the rectifying tower into liquid for reflux. The low-temperature rectification of boron-10 isotope separation requires that the refrigerating system can accurately provide refrigerating power with different temperatures and different cold capacities in a temperature region of 163K to 173K in a condensing section, the temperature of the top of the tower is controlled, and the cold capacity required by condensing rising boron trifluoride steam in a rectifying tower is met. However, the cooling medium in the related art easily converts boron trifluoride into a solid, which causes not only an increase in consumption of the cooling medium but also difficulty in normal operation of the cryogenic rectification column. Disclosure of Invention It is therefore a primary object of embodiments of the present application to provide a cooling circulation system capable of reducing the risk of rectifying substances being converted into solids. In order to achieve the above object, the technical solution of the embodiment of the present application is as follows: The embodiment of the application provides a cooling circulation system, which comprises: A rectifying tower; The heat exchange pipeline comprises a first medium pipeline and a circulating pipeline, wherein the first medium pipeline is used for flowing a first medium, the circulating pipeline is used for flowing a second medium, the circulating pipeline comprises a liquid medium pipeline and a gaseous medium pipeline which are mutually communicated, the rectifying tower is arranged at the communication position of the outlet end of the liquid medium pipeline and the inlet end of the gaseous medium pipeline so as to exchange heat with the second medium in the liquid medium pipeline, and the second medium in the gaseous medium pipeline exchanges heat with the first medium in the first medium pipeline at the communication position of the outlet end of the gaseous medium pipeline and the inlet end of the liquid medium pipeline, wherein the liquefaction temperature of the second medium is higher than that of the first medium. In one embodiment, the cooling circulation system includes a heat exchanger including a first inlet, a first outlet, a second inlet, and a second outlet; the first medium pipeline comprises a liquid supply pipeline and an air outlet pipeline, the liquid supply pipeline is communicated with the first inlet and used for supplying the first medium into the heat exchanger, and the air outlet pipeline is communicated with the first outlet and used for receiving the first medium flowing out of the first outlet; an outlet end of the gaseous medium line communicates with the second inlet for feeding the second medium into the heat exchanger, and an inlet end of the liquid medium line communicates with the second outlet for receiving the second medium flowing out of the second outlet. In one embodiment, the first inlet is located on the top side of the second inlet and the second outlet, and/or, The first outlet is located on a top side of the second inlet and the second outlet. In one embodiment, the cooling circulation system further comprises a buffer tank and a transfer pump, the buffer tank and the transfer pump are disposed on the liquid medium line, and the transfer pump is located between the buffer tank and the rectifying tower. In one embodiment, the circulation pipeline further comprises a liquid medium branch, the cooling circulation system comprises a control valve, one end of the liquid medium branch is communicated with the liquid medium pipeline between the delivery pump and the rectifying tower, the other end of the liquid medium branch is communicated with the buffer tank, and the control valve is arranged on the liquid medium branch. In one embodiment, the cooling circulation system comprises a plurality of rectifying towers, and the rectifying towers are arranged in parallel in the circulation pipeline