CO2 trapping system on basis of thermal steam compression and spraying temperature regulation

Abstract

The invention relates to a CO2 trapping system on the basis of thermal steam compression and spraying temperature regulation. The system is characterized in that one-step or multistage thermal steam compression is adopted; overheated or saturated steam is used as working steam; after condensed water 13 is processed by a flash evaporation heater 30, flash evaporated water vapor enters a thermal steam compressor to be compressed to have steam parameters required by a solution scalder; and the temperature of the steam is regulated by adopting a condensed water reflux spraying mode. According to the system, the high energy grade of the overheated steam is sufficiently utilized, the overheated steam is used as the working steam of the thermal steam compressor and low-grade heat energy generated in the production process of the CO2 trapping system is recycled, so that the energy consumption of the system is greatly reduced and the thermal pollution to the environment is reduced.

Description

technical field [0001] The core of the present invention is to propose a CO based on thermal vapor compression and spray temperature adjustment 2 Capture system, mainly used to reduce chemical absorption CO 2 Energy consumption of the capture system. Background technique [0002] figure 1 In order to use chemical absorption method for power plant flue gas CO 2 The capture system diagram, the main working process is: the flue gas 1 after the desulfurization of the power plant is sent to the absorption tower 2 by the induced draft fan after the flow is adjusted, and a part of the CO 2 Absorbed by the absorbent, the tail gas 3 is discharged into the atmosphere from the top of the tower. Absorb CO 2 The final rich liquid 4 is sent from the bottom of the absorption tower to the lean-rich liquid heat exchanger 5 through the rich liquid pump, and the CO after heat recovery 2 The rich liquid 6 is sent to the regeneration tower 7 for desorption. desorbed CO 2 After the gas 14...

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Problems solved by technology

[0004] In summary, in the existing power plant flue gas CO 2 In the capture system, the high-temperature, high-pressure superheated steam is mixed with the temperature-reduced and decompressed water to obtain the medium-pressure steam required by the process, which causes the loss of available energy, and the high-grade energy of the superheated steam is not effectively utilized; the heating steam is condensed in the solution boiler The condensed water has not been rationally utilized; the heat released by the lean liquid cooler 23 and the regeneration gas cooler 15 has not been recycled, and such an energy utilization system is not conducive to the reduction of system energy consumption

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