Method for catching carbon dioxide in flue gas by active sodium carbonate and apparatus thereof

Abstract

The invention relates to a method for catching carbon dioxide in flue gas by active sodium carbonate and an apparatus thereof. The method comprises the following steps of: firstly, combining alkylol amine and CO2 into a zwitterions intermediate product with an alkylol amine activator-added sodium carbonate water solution as a CO2 absorbent; then carrying out hydration reaction to dissociate again for recycling; neutralizing H<+> generated in the hydration reaction with an alkaline ion CO3<2->; and combining HCO3<-> generated in the hydration reaction and the metallic ion Na<+> to separate gradually to finally obtain a sodium bicarbonate slurry. The sodium bicarbonate slurry is subjected to resolving and regeneration to obtain CO2 gas and a sodium carbonate solution. The CO2 gas is prepared into a liquid state through conventional treatment. The apparatus mainly comprises an absorbing tower, a tilted plate sedimentation tank, a regenerating tower, a cooler, a gas-liquid separator, a dryer, a compressor, a condenser, and the like which are connected through pipelines. The invention has the characteristics of simple process flow and apparatus combination, low investment and running cost and capability of being suitable for large flow rate and low concentration of the flue gas of the tail part of a power station boiler; and the expensive alkylol amine is replaced to prepare the liquid carbon dioxide with high purity.

Description

technical field [0001] The invention relates to the carbon dioxide emission reduction and resource utilization technology in power plant boiler flue gas, in particular to a method and equipment for capturing carbon dioxide in flue gas by activated sodium carbonate. Background technique [0002] Atmospheric greenhouse effect is one of the most important environmental problems facing mankind today. Among all greenhouse gases, CO 2 With high content in the atmosphere and long life, it contributes the most to the greenhouse effect, so CO 2 Emission reduction is an inevitable requirement for sustainable development. According to statistics, by the end of 2007 my country's CO 2 The emissions are 6.01 billion tons / year, ranking first in the world, of which 1623 strong emission sources (single-source emissions of CO 2 1 million tons / year or more) CO emissions 2 up to 3.9 billion tons / year, accounting for all CO 2 About 65% of emissions. Coal-fired power stations account for th...

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Problems solved by technology

The method and its equipment can fully adapt to the above-mentioned characteristics of the flue gas at the tail of the power plant boiler, overcome the defects of organic amine oxidation degradation, serious equipment corrosion, and high regeneration energy consumption, and produce high-purity liquid carbon dioxide at low cost and high efficiency

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