一种用于液体二氧化碳生产的制冷系统

By introducing a two-stage condenser and a liquid ammonia circulation system into the production of liquid carbon dioxide, the utilization of cooling capacity is optimized, the problem of low condensation efficiency is solved, the efficient use of liquid ammonia and the recovery of waste heat are realized, and the production cost is reduced.

CN224517160UActive Publication Date: 2026-07-17SICHUAN QINGYUAN ENVIRONMENTAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SICHUAN QINGYUAN ENVIRONMENTAL TECHNOLOGY CO LTD
Filing Date
2025-09-04
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In current liquid carbon dioxide production, condensation efficiency is limited, resulting in excessively high heat exchange load on the first-stage condenser, excessive consumption of liquid ammonia, and underutilization of the liquid ammonia's refrigeration capacity.

Method used

A two-stage condenser and liquid ammonia circulation system are adopted. After being pre-cooled by the precooler, carbon dioxide enters the first-stage condenser. The liquid carbon dioxide condensed in the second-stage condenser is used as the pre-cooling medium. Combined with the liquid ammonia subcooler and the gaseous ammonia purification and liquefaction system, the liquid ammonia circulation and waste heat recovery are optimized, thereby improving the utilization rate of cooling capacity and the refrigeration efficiency of liquid ammonia.

Benefits of technology

The heat exchange load of the first-stage condenser was reduced, the cooling capacity utilization rate was improved, the liquid ammonia consumption was reduced, the full utilization of the liquid ammonia refrigeration capacity was ensured, and the efficient recovery of waste heat was achieved.

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Abstract

本实用新型涉及液体二氧化碳生产技术领域，公开了一种用于液体二氧化碳生产的制冷系统，包括二氧化碳处理系统、液氨循环系统、气氨净化液化系统、余热回收系统，所述二氧化碳处理系统由精馏塔、预冷器、一级冷凝器、二级冷凝器、二氧化碳尾气处理装置组成，所述精馏塔的出气管与预冷器的进气管连通，所述预冷器的出气管与一级冷凝器的第一进气管连通，将气相的二氧化碳先通入到精馏塔内，经过初步精馏后依次通入到预冷器、一级冷凝器、二级冷凝器内，气相二氧化碳经过预冷器预冷后，整体温度降低，使得在进入一级冷凝器内进行初步冷凝时，降温温差较大，进而降低了一级冷凝器的换热负荷。
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Claims

1. A refrigeration system for liquid carbon dioxide production, comprising a carbon dioxide treatment system (1), a liquid ammonia circulation system (2), a gaseous ammonia purification liquefaction system (3), a waste heat recovery system (4), characterized in that: The carbon dioxide treatment system (1) consists of a distillation column (101), a precooler (102), a primary condenser (103), a secondary condenser (104), and a carbon dioxide tail gas treatment device (105). The outlet pipe of the distillation column (101) is connected to the inlet pipe of the precooler (102). The outlet pipe of the precooler (102) is connected to the first inlet pipe of the primary condenser (103). The first outlet pipe of the primary condenser (103) is connected to the second inlet pipe of the secondary condenser (104). The first outlet pipe of the secondary condenser (104) is connected to the first inlet pipe of the carbon dioxide tail gas treatment device (105). The first liquid outlet pipe of the secondary condenser (104) is connected to the reflux pipe of the distillation column (101). The second liquid outlet pipe of the secondary condenser (104) is connected to the liquid inlet pipe of the precooler (102). The liquid outlet pipe of the precooler (102) is connected to the liquid phase carbon dioxide temporary storage tank.

2. A refrigeration system for the production of liquid carbon dioxide according to claim 1, characterized in that: The liquid ammonia circulation system (2) consists of a liquid ammonia storage tank (201) and a liquid ammonia subcooler (202). The top of the liquid ammonia storage tank (201) is provided with a pipe for replenishing liquid ammonia. The first liquid outlet pipe of the liquid ammonia storage tank (201) is connected to the first liquid inlet pipe of the liquid ammonia subcooler (202). The second liquid outlet pipe of the liquid ammonia storage tank (201) is connected to the second liquid inlet pipe of the secondary condenser (104). The first liquid outlet pipe of the liquid ammonia subcooler (202) is connected to the second liquid inlet pipe of the secondary condenser (104).

3. A refrigeration system for the production of liquid carbon dioxide according to claim 2, characterized in that: The second liquid outlet pipe of the primary condenser (103) is connected to the second liquid inlet pipe of the secondary condenser (104), the second liquid outlet pipe of the secondary condenser (104) is connected to the second liquid inlet pipe of the liquid ammonia subcooler (202), and the second liquid outlet pipe of the liquid ammonia subcooler (202) is connected to the liquid inlet pipe of the liquid ammonia storage tank (201).

4. A refrigeration system for the production of liquid carbon dioxide according to claim 3, characterized in that: The ammonia purification and liquefaction system (3) includes a primary buffer separator (301), a secondary buffer separator (302), an oil separator (303), a two-stage ammonia compressor (304), and a heat exchanger (305). The second outlet pipe of the secondary condenser (104) is connected to the first inlet pipe of the primary buffer separator (301), the first outlet pipe of the primary buffer separator (301) is connected to the first inlet pipe of the oil separator (303), and the first output pipe of the oil separator (303) is connected to the first input pipe of the two-stage ammonia compressor (304).

5. A refrigeration system for the production of liquid carbon dioxide as claimed in claim 4, characterized in that: The second outlet pipe of the primary condenser (103) is connected to the first inlet pipe of the secondary buffer separator (302), the second outlet pipe of the secondary buffer separator (302) is connected to the second inlet pipe of the two-stage ammonia compressor (304), the second output pipe of the two-stage ammonia compressor (304) is connected to the second output pipe of the oil separator (303), and the second output pipe of the oil separator (303) is connected to the second input pipe of the two-stage ammonia compressor (304).

6. A refrigeration system for the production of liquid carbon dioxide as set forth in claim 5, characterized in that: The second outlet pipe of the two-stage ammonia compressor (304) is connected to the waste heat recovery system (4). The waste heat recovery system (4) includes a waste heat recovery unit (401). The inlet pipe of the waste heat recovery unit (401) is connected to the second outlet pipe of the two-stage ammonia compressor (304). The outlet pipe of the waste heat recovery unit (401) is connected to the inlet pipe of the heat exchanger (305). The outlet pipe of the heat exchanger (305) is connected to the inlet pipe of the evaporator condenser (306). The liquid outlet pipe of the evaporator condenser (306) is connected to the inlet pipe of the liquid ammonia storage tank (201).

7. A refrigeration system for the production of liquid carbon dioxide according to claim 6, characterized in that: The waste heat recovery unit (401) is connected to a factory heat medium input pipe (402) and a factory heat medium output pipe (403).

8. A refrigeration system for the production of liquid carbon dioxide according to claim 7, characterized in that: Valves are installed at the pipe connections of the waste heat recovery unit (401), distillation column (101), precooler (102), primary condenser (103), secondary condenser (104), carbon dioxide tail gas treatment device (105), liquid ammonia storage tank (201), liquid ammonia subcooler (202), primary buffer separator (301), secondary buffer separator (302), oil separator (303), two-stage ammonia compressor (304), heat exchanger (305), and evaporator condenser (306).