Carbon dioxide mixed capturing and microalgae carbon fixation coupling technology for coal-fired power plant flue gas

Abstract

The invention discloses a carbon dioxide mixed capturing and microalgae carbon fixation coupling technology for coal-fired power plant flue gas. The technology comprises a carbon dioxide mixed capturing process and a microalgae carbon fixation process; through adjustment of the CO2 capturing rate of a mixed capturing system, control of the CO2 concentration in retentate gas is achieved, and the unit capturing cost and the energy consumption of the mixed capturing system are reduced; liquefied natural gas is used for providing low-temperature energy for the mixed capturing system, and during natural gas combustion, gas and air produced in a microalgae carbon fixation link are used as an oxygen source and generated waste heat provides heat for the microalgae carbon fixation process; the microalgae carbon fixation process uses flue gas produced after the combustion of the retentate gas and the natural gas in the mixed capturing technological process as a carbon source, the breeding cost and the breeding difficulty of a high-concentration carbon dioxide resisting algae variety are reduced, the application scope of the microalgae variety is broadened, the unit treatment cost of trace amounts of harmful impurities in the flue gas is reduced, and processed lipid and algae powder products can improve the economic efficiency of the technology.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide capture, in particular to a coal-fired power plant flue gas carbon dioxide mixed capture coupled microalgae carbon fixation process. Background technique [0002] Since the industrial revolution, with the burning of fossil fuels, the concentration of carbon dioxide in the atmosphere has risen rapidly, and the greenhouse effect has become increasingly serious. The Intergovernmental Panel on Climate Change (IPCC) of the United Nations pointed out that the average concentration of carbon dioxide in the atmosphere on the earth's surface is currently higher than 400ppm. In the total warming effect of greenhouse gases, carbon dioxide contributes about 63%. Reducing carbon dioxide emissions is conducive to improving and slowing down the greenhouse effect. According to relevant reports from the International Energy Agency (IEA), in order to achieve the goal of 2 degrees Celsius warming, the world n...

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Problems solved by technology

[0008] Existing membrane materials cannot meet the target requirements of single-stage membrane modules to achieve a capture rate of 90% and a purity of 95% of carbon dioxide in the flue gas of coal-fired power plants; When the capture rate is between 80% and 90%, the unit capture cost increases significantly with the increase of the capture rate.

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