METHOD FOR CARBON DIOXIDE GAS CAPTURE FROM SMOKE GAS OF A POWER PLANT AND INSTALLATION FOR ITS IMPLEMENTATION

摘要

1. A method of collecting carbon dioxide from the flue gas of a power plant, comprising the steps of: 1) providing an organic amine and an ionic liquid in a molar ratio (1-1.1): 1, mixing an organic amine, an ionic liquid and water to obtain an aqueous solution of a composite absorbent, having a concentration of 20-40% by weight; using an aqueous solution of a composite absorbent containing organic amine and an ionic liquid as a CO absorbent, uniformly spraying an aqueous solution of a composite absorbent in flue gas from the rear of the boiler power plants after dust removal and desulfurization, allowing the flue gas to move upward for full contact with the aqueous solution of the composite absorbent sprayed down, and allowing the CO gas to react with the composite absorbent, resulting in CO absorption and a solution rich in A · CO and B · is formed CO, in which A is an organic amine, and B is an ionic liquid; regulation of the liquid-gas ratio from 5 to 25 l / m, the reaction temperature from 40 ° C to 55 ° C, and the reaction pressure from 0.01 to 10 atm (1.01-1013 kPa); 2) allowing the solution to be rich A · CO and B · CO, settle and become transparent under the action of self-aggregation with the formation of various layers of liquid, including the lower layer, which is a mixed solution rich in A · CO and B · CO, and the upper layer, which is an aqueous solution of a composite absorbent; separating the bottom layer to obtain a mixed solution rich in A · CO and B · CO; performing heat exchange on the separated mixed solution rich in A · CO and B · CO to allow CO gas dissolved or absorbed in the aqueous solution of the composite