A mixture transcritical cycle waste heat recovery system and method

By adopting a mixture transcritical circulation system in the supercritical CO2 Breton cycle, the problems of inability to recover low temperature heat and working fluid separation in traditional systems are solved, and more efficient heat recovery and system stability are achieved.

CN112901295BActive Publication Date: 2025-03-18XIAN THERMAL POWER RES INST CO LTD
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Patent Information

Application Number
CN202110347234.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-03-31
Publication Date
2025-03-18
Estimated Expiration
2041-03-31

AI Technical Summary

Technical Problem

The traditional supercritical CO2 Breton cycle has the problem of low-temperature heat recovery in waste heat recovery, and the mixture of CO2 and H2O is easily separated in the system, affecting cycle stability and equipment safety.

Method used

The mixture transcritical circulation system is used to exchange heat through high-temperature turbine and heat rebator, and H2O and CO2 are separated by gas-liquid separator, and compress and boost respectively to ensure that the state changes of the working fluid in different parts meet the supercritical conditions.

Benefits of technology

It effectively recycles more heat, improves the thermal power conversion efficiency of the system, reduces the equipment volume, improves the safety and stability of the equipment, and expands the application range of the system.

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Abstract

The present invention discloses a mixture transcritical cycle waste heat recovery system and method, the system includes a high-temperature turbine, a high-temperature regenerator, a medium-temperature regenerator, a gas-liquid separator, a liquid pump, a low-temperature regenerator, a precooler, a main compressor, a low-temperature flue gas heater, a medium-temperature flue gas heater, a low-temperature turbine, and a high-temperature flue gas heater connected in sequence. In the system, a mixture of H2O and C2O is used as a working fluid, the working fluid is in a supercritical mixed state at the high-temperature part, and part of the H2O will be separated from CO2 at the low-temperature part. CO2 is compressed and pressurized by a compressor, and H2O is pressurized by a water pump. The system uses a water pump to replace the recompressor in the traditional CO2 Brayton cycle. The power consumption of compressed liquid is much smaller than that of the recompressor, and the temperature of high-pressure water is also increased, solving the problem of mismatch between the heat absorption of the low-temperature working fluid and the heat release of the heat source. At the same time, it avoids the phenomenon of liquid carrying during gas compression and vaporization during liquid compression. The safety and stability of the equipment are improved.
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