Pneumatic trapping system and process for carbon dioxide (CO2) in smoke

Abstract

The invention relates to a pneumatic trapping system and process for carbon dioxide (CO2) in smoke. The pneumatic trapping process comprises the following steps that: (1) the smoke enters an absorption tower and is contacted with a serotonin solution in a counterflow manner so as to be absorbed under chemical reaction, the absorbed smoke upwards passes through a washing device, so that an absorbent contained in the smoke is cleaned out, and the smoke is discharged directly; (2) a solution which traps the CO2 is changed into rich liquor, the rich liquor flows to the bottom of the absorption tower and is conveyed to a barren and rich liquor heat exchanger through a rich liquor pump, and the rich liquor subjected to temperature raising enters a desorption tower; (3) the rich liquor is subjected to thermal desorption in the desorption tower to obtain regenerative gas rich in CO2 and solution steam, and the regenerative gas is subjected to heat exchange, condensation and gas and liquor separation to obtain a CO2 product; and (4) desorbed barren liquor is pumped into the barren and rich liquor heat exchanger and a barren liquor cooler by a barren liquor pump, and is reused after being cooled to temperature of an absorption reaction window. By adopting an efficient pneumatic decarbonization technology, the smoke and amine liquor can be contacted with each other fully, so the decarbonization efficiency is up to over 90 percent; and the system and the process are applicable to trapping of the CO2 in a large amount of smoke and can be applied to CO2 trapping devices with yearly output of 1,000,000 tons.

Description

technology field; [0001] The invention belongs to the technical field of environmental protection, and relates to the capture of carbon dioxide from flue gas of a coal-fired boiler, in particular to a pneumatic capture system and process of carbon dioxide from flue gas. Background technique; [0002] The "greenhouse effect" caused by greenhouse gases mainly carbon dioxide has attracted widespread attention and attention from mankind. The methods for industrial separation and recovery of carbon dioxide include chemical absorption method, low temperature distillation method, pressure swing adsorption method and membrane separation method, etc., and their combinations, while coal-fired boiler flue gas CO 2 The most important process of capture technology is chemical absorption. The current flue gas chemical absorption method captures CO 2 The main problems are that the one-time investment of equipment is large, the operating cost is high and the energy consumption is large. ...

AI Technical Summary

Problems solved by technology

The current flue gas chemical absorption method captures CO 2 The main problem is that the one-time investment of equipment is large, the operating cost is high and the energy consumption is large

[0003] Through searching, no published patent documents identical to the patent application of the present invention have been found

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