Waste heat driven S-CO2 power cycle operation method and system

By combining gas-liquid interactive injection with a heat pump chiller, the safety and efficiency issues of CO2 charging and recovery in the S-CO2 power cycle system are solved, enabling the system to quickly adjust and operate efficiently under varying conditions, reducing working fluid waste and environmental pollution.

CN119982135BActive Publication Date: 2026-06-02CHINA THREE GORGES CORPORATION +2
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Patent Information

Application Number
CN202411304575.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-19
Publication Date
2026-06-02
Estimated Expiration
2044-09-19

AI Technical Summary

Technical Problem

Existing S-CO2 power cycle systems have safety and efficiency issues during CO2 charging and recovery, especially under variable load operation and ambient temperature fluctuations. The problems of how to quickly adjust the working fluid flow and prevent the CO2 at the compressor inlet from liquefying have not been effectively solved.

Method used

CO2 is injected via gas-liquid interaction, and combined with heat pump chiller and cooling water flow regulation, the system temperature and pressure can be rapidly regulated; valves are installed in the waste heat pipeline to control the CO2 flow, and the heat pump chiller is used to maintain a constant compressor inlet pressure; when the system is shut down, the working fluid is safely recovered through separator and CO2 Dewar tank.

Benefits of technology

It enables rapid system response under varying operating conditions, prevents CO2 at the compressor inlet from liquefying, improves CO2 recovery and utilization rate, and reduces working fluid waste and environmental pollution risks.

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Abstract

The application provides an operation method of a waste heat driven S-CO2 power cycle system, belongs to the field of waste heat utilization and power generation, and comprises the following steps: CO2 charging, charging of the system working medium to a storage tank through an injection pipeline; system starting, variable condition operation, environmental temperature being lower than normal working temperature, adjustment of cooling water flow, separation of liquid CO2 at the output port of a cooler to the storage tank, opening of a waste heat valve of a waste heat pipeline when load increase is needed, increase of CO2 flow, closing of the waste heat valve of the waste heat pipeline when load decrease is needed, decrease of the CO2 flow, and constant keeping of the first compressor inlet pressure by storage tank accompanying cooling. When the environmental temperature is low, the cooling water flow is adjusted, and then the system temperature, pressure and flow are rapidly adjusted, so that the compressor inlet CO2 is effectively prevented from being in a liquid state, and rapid response of the system under variable conditions is realized.
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