System and method for synchronously recovering carbon dioxide and nitrogen in flue gas by chemical method and PSA (Pressure Swing Adsorption) method

Abstract

The invention belongs to the technical field of recycovering of boiler flue gas, and particularly relates to a system and method for synchronously recovering carbon dioxide and nitrogen in flue gas through a chemical method and a PSA method. The system for synchronously recovering the carbon dioxide and the nitrogen in the flue gas by the chemical method and the PSA method comprises a carbon dioxide chemical method recovery system, a carbon dioxide refining and liquefying system and a nitrogen PSA concentration and purification system; and the carbon dioxide chemical recovery system comprises a carbon dioxide absorption tower, a carbon dioxide regeneration tower, a heat exchanger and a first cooler. The system for synchronously recovering the carbon dioxide and the nitrogen in the flue gas by the chemical method and the PSA method has a good recovery effect on the carbon dioxide and the nitrogen, and can effectively save energy.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of boiler flue gas, and in particular relates to a system and method for synchronously recovering carbon dioxide and nitrogen in flue gas by a chemical method and a PSA method. Background technique [0002] The greenhouse effect and extreme weather caused by carbon dioxide emissions have seriously affected the global climate. Over the past year, the energy resources of many countries have been in emergency for many times. It is urgent to reduce or recover carbon dioxide and reduce production energy consumption. The sources of carbon dioxide mainly include the combustion of fossil fuels (coal, oil, natural gas), the production and processing of coal and oil, and the daily production and life of human beings. The capture and reuse of carbon dioxide and nitrogen from the flue gas of coal-fired boilers is an important measure to achieve the double carbon goal, which not only further...

AI Technical Summary

Problems solved by technology

The system can capture carbon dioxide and nitrogen to the greatest extent, and the product purity is high, but there are problems such as inflexible equipment operation, high energy consumption and low recovery rate of carbon dioxide

When the nitrogen output of the latter stage is reduced or no capture is performed, the pressure compression value of the former stage is too high, and the power consumption is large

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