Coal chemical industry carbon dioxide tail gas low-temperature trapping, purifying, liquefying and separating system and method

Abstract

The invention relates to a coal chemical industry carbon dioxide tail gas low-temperature trapping, purifying, liquefying and separating system and method. The system comprises a feed gas compressor, a reboiler, a first adsorption tower, a second adsorption tower, a regenerated gas heater, a heat exchanger, a high-pressure separator, a low-pressure separator, a condensing heat exchanger and a carbon dioxide rectifying tower. According to the system, low-concentration carbon dioxide tail gas generated by the coal chemical industry device is captured, purified, liquefied and separated through a low-temperature method to produce an industrial-grade standard carbon dioxide product, and the industrial-grade standard carbon dioxide product and hydrogen can be converted into methane through the methanation device, so that the recovery and comprehensive utilization of carbon dioxide are realized, greenhouse gases are reduced, and the production cost is reduced. The utilization rate of carbon dioxide resources is improved, and remarkable economic and social values are achieved.

Description

technical field [0001] The invention relates to the technical field of low-carbon energy and environmental protection, in particular to a system and method for low-temperature capture, purification, liquefaction and separation of carbon dioxide tail gas in coal chemical industry. Background technique [0002] carbon dioxide (CO 2 ) As a greenhouse gas, excessive emissions have caused continuous warming of the global environment. Gas-fired power plants, coal-fired power plants, and coal chemical plants emit a large amount of carbon dioxide tail gas every year, the main components of which are carbon dioxide, nitrogen, and a small amount of oxygen, carbon monoxide, and hydrogen. Carbon dioxide is an important chemical raw material. If the carbon dioxide in the tail gas can be captured, recycled and utilized, it will not only reduce the emission of greenhouse gases, but also improve the recycling of carbon resources. [0003] For the carbon dioxide tail gas produced by coal c...

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Problems solved by technology

[0003] For the carbon dioxide tail gas produced by coal chemical plants, the volume fraction of carbon dioxide components is 70%~90%, the volume fraction of nitrogen components is 10%~30%, CO+H 2 The volume fraction of components is about 1%, and there is currently no device for recycling and processing the carbon dioxide tail gas produced by coal chemical plants

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