Flue gas decarbonization system and flue gas decarbonization method for two-step regeneration of carbon dioxide

Abstract

The invention discloses a flue gas decarbonization system and a flue gas decarbonization method for two-step regeneration of carbon dioxide. The flue gas decarbonization system is formed by coupling an alkylol amine and methanol mixed solution adsorption system with a two-step carbon dioxide regeneration system, wherein when the two-step carbon dioxide regeneration system works, two steps of removing methanol before regeneration and regenerating alkylol amine carbonate are carried out. In the step of removing methanol before regeneration, flue gas waste heat is utilized to provide a heat source to remove the methanol in rich liquor after adsorption; the regeneration process only aims at the alkylol amine carbonate; the energy consumption of sensible heat and evaporation heat are avoided; and the steam consumption of the thermal regeneration process is reduced. Two regeneration towers alternately implement removal of the methanol and regeneration of the alkylol amine carbonate by two sets of valve equipment, so that the continuous operation of a trapping system is ensured. According to the invention, both the flue gas waste heat and the condensation heat of methanol steam are utilized, the temperature of the regenerated carbon dioxide is reduced, the flue gas decarbonization of a power plant is efficiently implemented, and the flue gas decarbonization system and the flue gas decarbonization method for two-step regeneration of carbon dioxide have the characteristics of cleanness, high efficiency, energy saving, high decarbonization rate and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide emission reduction in flue gas, and relates to a flue gas decarbonization system with two-step regeneration of carbon dioxide and a method thereof. Background technique [0002] With the rapid development of the global economy, the demand for energy consumption has become prominent, and the resulting environmental problems such as the greenhouse effect are posing great challenges to the sustainable development of human beings. Carrying out basic and applied research on efficient flue gas purification technology from concentrated emission sources is of great practical significance for effectively reducing carbon dioxide emissions into the atmosphere, protecting the living environment of human beings, and promoting sustainable development. Reducing CO2 emissions from concentrated emission point sources such as power plants is the most effective way to reduce emissions. [0003] At present, t...

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Problems solved by technology

The disadvantage is that according to the experimental results at this stage, the process of preparing the adsorbent is complicated, the cost of the metal oxide used is high, and the efficiency of the adsorbent in adsorbing carbon dioxide is about 20% to 30% lower than that of the chemical absorption method.

[0009] Due to the above defects, the existing power plant flue gas purification systems still have a lot of room for development in terms of system design, energy saving, and environmental protection, and have not yet been able to effectively achieve the goals of energy saving and low cost.

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