Method for absorbing and activating carbon dioxide in boiler flue gas and application of method

Abstract

The invention discloses a method for absorbing and activating carbon dioxide in boiler flue gas and application of the method. The method comprises the following steps of: 1, replacing cane juice through lime milk with the concentration of 8-15-degree Be for absorbing the carbon dioxide in boiler flue gas and generating by-products of a calcium carbonate solution in the decarbonization process in a two-stage spray packing absorption tower; 2, reacting phosphoric acid and one part of calcium carbonate solution, and generating a monocalcium phosphate solution and high-concentration carbon dioxide gas when the PH is controlled to be less than 3; 3, excessively injecting the high-concentration carbon dioxide gas into the calcium carbonate solution through an ejector, dissolving and activating the calcium carbonate into calcium bicarbonate solution, and controlling the PH to be less than 6; and 4, respectively filling the monocalcium phosphate solution and calcium bicarbonate solution generated in the decarburization and activation processes in the steps 2 and 3 into a storage box for later use. The method has the advantages of reducing the retention time of the cane juice in the carbon absorption process and saving the investment, along with high absorption rate and the like.

Description

technical field [0001] The invention relates to the technical field of boiler flue gas treatment and application, in particular to a method for absorbing and activating carbon dioxide of boiler flue gas and its application. Background technique [0002] Carbon dioxide is used as a clarifying agent for sugarcane juice because carbon dioxide reacts with milk of lime in sugarcane juice to form calcium carbonate, and a large number of new calcium carbonate particles have a large specific surface energy, which can absorb and remove some non-sugar impurities in sugarcane juice . Therefore, it is a large number of new calcium carbonate particles that really play a clarification role (and the other clarifiers sulfur dioxide and phosphoric acid in the sugar factory have similar effects, the purpose is to produce a large number of new calcium sulfite and calcium phosphate particles in the sugarcane juice, so as to adsorb and remove them. Non-sugar impurities in some sugarcane juice)....

AI Technical Summary

Problems solved by technology

As a result, the flue gas stays in the full-filled tank for a very short time, and the carbon dioxide absorption rate is about 5%. At the same time, a large amount of foam is generated, so that the full-filled tank often foams and stops production.