Method and system for capturing CO2 by temperature-lowering absorption and low-voltage desorption

Abstract

The invention relates to a method and a system for acquiring CO2 by temperature-lowering absorption and low-voltage desorption, in particular to a method and a system for captauring CO2 by a method of absorption and desorption, which overcomes the defects of difficult control, large energy consumption of the warming voltage-varying desorption method adopted by power plants to capturing CO2 and the defects of toxic and hazardous gas generated during capturing CO2 by chemisorption method. The method comprises temperature reduction by flue gases, communicating absorption of a first absorption and desorption tower, communicating absorption of a second absorption and desorption tower, and electrified temperature-increasing desorption, purification and temperature reduction of the first the absorption and desorption tower, CO2 gas purging, electrified temperature-increasing desorption, purification and temperature reduction of the second absorption and desorption tower, and communicating absorption of the first the absorption and desorption tower during a next absorption and desorption circulating process. In the system, the first and the second absorption and desorption towers are connected with an alternating current power supply through a first switch and a second switch, and the alternating current power supply is connected with the first and the second absorption and desorption towers. In the utility model, a physical adsorption method is adopted, thereby avoiding the generation of other toxic and hazardous gases by chemical methods. The method and the system are used for capturing CO2 in flue gases in coal industry works and power plants.

Description

technical field [0001] The invention relates to a method for capturing CO by means of adsorption and desorption 2 methods and systems. Background technique [0002] CO 2 It is the most important greenhouse gas and the main cause of the greenhouse effect. while in CO 2 Among the sources, thermal power plants are an important source of CO 2 Concentrated emission sources, about 1 / 3 of the world's CO 2 are emitted from power plants. Therefore, controlling and mitigating CO in electricity production 2 The emissions are of great significance to solving the problems of global warming and greenhouse effect. Therefore, the control of CO in the flue gas of thermal power plants, especially coal-fired power plants 2 Emissions are an effective measure to slow down the greenhouse effect. [0003] The main components of flue gas produced by power plant combustion are N 2 , O 2 , CO 2 , SO 2 and NO X , the main components after flue gas desulfurization and denitrification are ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a low-temperature adsorption low-voltage electric desorption capture CO 2 A method and system to solve the problem of CO in some existing power plants 2 For desorption and capture, the method of temperature-swing desorption and pressure-swing desorption is adopted. Due to the need for variable pressure and temperature, it is not conducive to control, the energy consumption is large, and the control is relatively difficult, and the method of chemical adsorption is used to capture CO 2 It is bound to produce some toxic and harmful gases, causing secondary pollution to the atmosphere

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