A Flue Gas Carbon Dioxide Capture System Based on Two-Phase Absorbent

Abstract

The invention relates to a two-phase absorbent based carbon dioxide capturing system for flue gas. The system comprises a high-temperature absorption tower, a low-temperature absorption tower and a desorption tower, wherein a flue gas inlet is formed in the lower part of the high-temperature absorption tower, the flue gas is delivered to the lower part of the low-temperature absorption tower through a flue gas pipe at the top, and a first phase splitter is arranged at the bottom of the high-temperature absorption tower; a light phase in the first phase splitter is delivered to the upper part of the low-temperature absorption tower through a first absorbent pipe, and a heavy phase is delivered to the desorption tower through a first heavy phase pipe; an interstage cooler is arranged on thefirst absorbent pipe; a second phase splitter is arranged at the bottom of the low-temperature absorption tower, a light phase in the second phase splitter is delivered to the upper part of the high-temperature absorption tower through a second absorbent pipe, and a heavy phase is delivered to the desorption tower through a second heavy phase pipe. With adoption of the double-tower scheme, the carbon dioxide capturing system for the flue gas has the advantages that tower height is reduced and investing cost of the absorption towers is reduced accordingly.

Description

technical field [0001] The present invention relates to CO 2 The capture field specifically relates to a flue gas carbon dioxide capture system based on a two-phase absorbent. Background technique [0002] Global warming poses severe challenges to human survival and social development, and is a major environmental problem that needs to be resolved urgently. To deal with global climate change, the key is to reduce the emission of greenhouse gases, especially carbon dioxide. At the World Climate Conference held in 2009, the Chinese government solemnly promised that by 2020, CO emissions per unit of GDP would 2 Compared with 2005, it has dropped by 40-45%, which has brought great challenges to related industries in our country. In many CO 2 Among emission reduction technologies, chemical absorption has been applied in industry. [0003] In recent years, liquid-liquid two-phase absorbents have been proposed to absorb CO 2 After that, a liquid-liquid two-layer liquid phase ...

AI Technical Summary

Problems solved by technology

The heavy phase heats up in the lean-rich liquid heat exchanger, and the heavy phase CO 2 Load reduction, partial CO 2 Precipitation, resulting in a decrease in the heat transfer efficiency of the lean-rich liquid heat exchanger

CO 2 With water vapor flowing out from the top of the desorption tower, the traditional process uses a regeneration gas cooler for cooling and dehydration. This process increases the amount of cooling water and wastes CO 2 heat with water vapor

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