CO2 compressive liquidation adjustable compound system based on recovery of internal energy of power plant

Abstract

The invention discloses a CO2 compressive liquidation adjustable compound system based on recovery of internal energy of a power plant, and belongs to the technical field of energy and environments. The system comprises a three-way valve, liquid separating tanks, diverters, an expander, heat exchangers, compressor interstage heat exchangers, multiple stages of CO2 compressors, compressors, a condenser, mixers, a cold side evaporator, throttle valves, a generator set and CO2 booster pumps. The system comprises an adjustable CO2 compressive liquidation unit and an internal energy integrated system. Waste heat in multiple varieties and at multiple temperature levels is integrally used section by section at multiple stages, the CO2 flow is dynamically adjusted, a good effect is achieved for extracting at different temperature levels and coping with the generating capacity fluctuation, the system is highly integrated, nonreversible losses generated in the heat exchange process are reduced,the energy consumption of the system is obviously reduced, the energy utilization rate is remarkably increased, and the system can be widely applied to the field of carbon trapping and compressing.

Description

technical field [0001] The invention relates to a CO based on energy recovery inside the power plant 2 The invention relates to an adjustable composite system for compression liquefaction, which belongs to the technical field of energy and environment. Background technique [0002] At present, 80% of the world's energy consumption still comes from fossil fuels, among which thermal power plants are an important part of the greenhouse gas effect. Although renewable energy is on the rise, it cannot meet the needs of current economic and social development. Therefore, at the juncture of the transformation of the low-carbon economy, CCS (Carbon Capture and Storage) technology has become a breakthrough. CCS technology can effectively reduce carbon dioxide emissions from large-scale power plant sources. In the context of energy crisis and global warming, carbon supplementary power plants have become the general trend, and it is particularly important to improve the utilization ra...

AI Technical Summary

Problems solved by technology

Multi-stage compression is a relatively mature technical solution at present. Since the temperature between the stages of the compressor is not high, cooling water is used as the cold source. Although this method is simple in equipment and easy to operate, the energy consumption is too high

At present, there is a refrigeration cycle to reduce the power consumption of the compression process, but the energy consumption is still high, and the external ammonia cycle refrigeration must use rectification equipment, the structure is very complicated, and ammonia water is a working fluid that works at high temperatures. , so it is of little significance for internal energy recovery;

[0004] There is still no good solution to the waste heat waste between compressor stages and the need for additional cooling water

And the power plant CO 2 The capture is completely in a static state, and it is difficult to cope with fluctuations in power generation and CO 2 Dynamic adjustment of production and demand

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