Multistage division regenerative carbon dioxide trapping system and technology

Abstract

The invention relates to a multistage division regenerative carbon dioxide trapping system. The system comprises an absorption tower, wherein rich liquor that flows out of the absorption tower is divided into two channels; a first pipeline is communicated with a rich liquor inlet formed in the upper part of a regeneration tower; a second pipeline is communicated with the rich liquor inlet of a rich and poor liquid heat exchanger; rich liquor that flows out of the rich and poor liquid heat exchanger is further divided into two channels; one channel is communicated with a rich liquor inlet formed in the central part of the regeneration tower; the other channel is communicated with the rich liquor inlet of a rich liquor reheater; the rich liquor outlet of the rich liquor reheater is communicated with the rich liquor inlet of a rich liquor flash tank; the rich liquor outlet formed in the bottom of the rich liquor flash tank is communicated with a rich liquor inlet formed in the lower part of the regeneration tower. According to the invention, the regeneration degree of the rich liquor can be increased and steam heat consumption needed during rich liquor regeneration can be reduced; in addition, steam condensates can be recycled in the lyophobic collecting box of main equipment to reduce the desalted water consumption of the trapping system.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and is especially suitable for low-concentration CO in flue gas produced by coal-fired boilers, gas turbines, and industrial furnaces. 2 capture, especially relates to a multi-stage split regeneration carbon dioxide capture system and process. Background technique [0002] The electric power and chemical industries need to consume a large amount of fossil raw materials such as coal and natural gas, and their use will bring CO 2 Mainly greenhouse gas emissions, the resulting climate change has become the focus of attention around the world. [0003] The flue gas carbon dioxide capture and recovery process based on alkaline alcohol amine absorption solvents has been mature in the chemical industry, and similar technologies have also been demonstrated in the power industry. The characteristic is that the regeneration of carbon dioxide in the solution needs to consume a large amount o...

AI Technical Summary

Problems solved by technology

[0003] The flue gas carbon dioxide capture and recovery process based on alkaline alcohol amine absorption solvents has been mature in the chemical industry, and similar technologies have also been demonstrated in the power industry. The characteristic is that the regeneration of carbon dioxide in the solution needs to consume a large amount of steam, resulting in high energy consumption of the system. The reason is that, for the existing carbon dioxide capture technology, in the process of regeneration of carbon dioxide, due to incomplete regeneration and low desorption degree, about One-third of the carbon dioxide has not been released and re-enters the absorption section, resulting in insufficient absorption capacity of the solution. To ensure the same capture output, it is necessary to increase the circulation flow of the solution, which will increase the consumption of regeneration steam and cause circulation pump work. At the same time, in the prior art, the steam only releases heat to the solution once through the heat exchanger, and the heat is not fully utilized, which is also one of the reasons for the high energy consumption of the system

Images