Technology for separating and recovering carbon dioxide from industrial tail gas

Abstract

The invention discloses a technology for separating and recovering carbon dioxide from industrial tail gas, which mainly adopts an energy high-integration means-heat pump rectification technology. The technology comprises the steps that the pretreated industrial tail gas enters the bottom of an absorption tower and is in countercurrent contact with the absorption liquid entering from the top of the absorption tower to obtain rich liquid; the rich liquid passes through a rich liquid pump and then is divided into two parts through a splitter, wherein the first part of the rich liquid enters from the top of a desorption tower by spraying, the second part of the rich liquid enters the desorption tower from the lower middle part of the desorption tower to be desorbed, and the desorbed carbon dioxide with a little water vapor is discharged from the top of the desorption tower; the barren liquid after the desorption exchanges heat with the first part of the rich liquid and then is cooled by a barren liquid cooler before entering the absorption tower from the top of the absorption tower to be recycled. Based on the traditional carbon dioxide trapping technology, the technology disclosed by the invention integrates the distribution desorption and heat pump rectification technology, effectively utilizes the latent heat of vapor at the top of the desorption tower, and greatly reduces the energy consumption in a system operation process; moreover, with simple flow and low operation cost, the technology also can obtain a high-purity carbon dioxide product so as to reduce the greenhouse gas emission.

Description

technical field [0001] The invention relates to industrial tail gas purification and carbon dioxide capture and recycling technologies, in particular to a process for separating and recovering carbon dioxide from industrial tail gas. Background technique [0002] With the increase of human industrial activities, a large amount of fossil fuels (oil, natural gas, coal) have been used, which has promoted the rapid development of the world economy, but has caused energy shortages and increasingly serious ecological and environmental problems. Energy is the lifeblood of the world's economic development, and fossil fuels play a dominant role in energy utilization. The burning of fossil fuels is currently the largest source of atmospheric environmental pollution and the largest source of carbon dioxide greenhouse gas emissions. Therefore, in order to control carbon dioxide emissions, carbon dioxide capture technology can be integrated into industrial production to capture and sepa...

AI Technical Summary

Problems solved by technology

Although the above process reduces the heat energy consumption to a certain extent, there are still problems such as high compression power consumption in steam recompression, multi-stage compression and other processes, and the overall operation energy consumption has not been reduced.

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