Device for capturing smoke and recovering carbon dioxide at low energy consumption and gas recovery process

Abstract

The invention discloses a device for capturing smoke and recovering carbon dioxide at low energy consumption and a gas recovery process. The device comprises an absorption tower, a desorption tower, arich solution pump, a vacuum flasher, a gas stripping desorption device, a desorption tower top gas heat recovery device and an absorbent concentration regulation device, a barren solution pump is connected on the side surface of the top end of the absorption tower through a first barren solution pipe and is connected with the vacuum flasher through a second barren solution pipe, the desorption tower is connected with the rich solution pump through the desorption tower top gas heat recovery device, and the absorbent concentration regulation device is connected between the desorption tower topgas heat recovery device and the second barren solution pipe. The recovery process is as follows: a solvent absorbs the carbon dioxide in the smoke, a rich solution heater uses a regenerated gas to heat the absorbent, then the absorbent enters the desorption tower, a hot barren solution is flashed in vacuum after being mixed, the flash gas enters the desorption tower to implement gas stripping, and the carbon dioxide is desorbed. The device reduces the number of heat exchangers, the heat is thoroughly recovered, the problem that a barren and rich solution heat exchanger is often blocked and needs to be cleaned is solved, the heat utilization ratio is high, and the equipment investment is low.

Description

technical field [0001] The invention relates to the technical field of energy saving and emission reduction, in particular to a device for collecting and recovering carbon dioxide from flue gas with low energy consumption and a gas recovery process. Background technique [0002] Carbon dioxide in the atmosphere is the main component of the global warming effect. Coal-fired power plants are the largest source of carbon dioxide pollution. The capture and utilization of carbon dioxide in coal-fired power plants is a long-term and important task. [0003] Carbon dioxide capture and storage technology CCS technology is currently the only effective solution that can significantly reduce carbon dioxide emissions from fossil fuel power generation, and is widely considered to be one of the important technologies for coping with global climate change and controlling greenhouse gas emissions. [0004] The flue gas of coal-fired power plants has the characteristics of low carbon dioxide...

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Problems solved by technology

[0013] The purpose of the present invention is to provide a low-energy-consumption flue gas capture and recovery device for carbon dioxide and a technical solution for a gas recovery process aimed at the deficiencies in the prior art. carbon dioxide, reducing the number of heat exchangers, heat recovery is thorough, avoiding the problem of frequent blockage and cleaning of poor-rich liquid heat exchangers, high heat utilization rate, eliminating the need for reboilers, and less investment in equipment

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