System device and method for desulfurization, denitrification and decarbonization of flue gas by ammonia process

Abstract

The invention provides a flue gas ammonia process desulfurization, denitrification and decarbonization system device and method, the system device comprises a desulfurization and denitrification tower, a decarbonization tower and an ammonia gas escape recovery tower which are connected in sequence along a flue gas flowing direction, so that NOx, SO2 and CO2 in flue gas respectively react with ammonia in absorption liquid to generate ammonium nitrate, ammonium sulfate and ammonium bicarbonate, and the ammonium nitrate, the ammonium sulfate and the ammonium bicarbonate are separated from the absorption liquid. The method can be used for producing ammonium salt compound fertilizer to realize resource utilization; the system device further comprises a crystallization tower, a pyrolyzer and a washing tower, liquid discharged from the liquid outlet of the decarburization tower can be crystallized to obtain ammonium bicarbonate, and then the ammonium bicarbonate is pyrolyzed and washed, so that ammonia gas can be recycled to obtain ammonia water for circulation, and CO2 can be obtained for industrial utilization. A crystallization mother solution generated by crystallization is used as a desulfurization and denitrification absorption solution to be introduced into a desulfurization and denitrification tower for desulfurization and denitrification treatment; the system device and the method provided by the invention not only can realize collaborative removal of various pollutants, but also can realize resource recycling.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to the technical field of flue gas ammonia desulfurization, denitrification and decarbonization, and in particular to a system device and method for flue gas ammonia desulfurization, denitration and decarburization. Background technique [0002] The development of my country's platform economy is in a critical period. It is necessary to focus on the long-term and take into account the current situation, make up for shortcomings, strengthen weaknesses, create an innovative environment, solve outstanding contradictions and problems, and promote the healthy and sustainable development of the platform economy. [0003] At present, flue gas decarbonization is mainly based on carbon capture, utilization and storage (CCUS) technology. The most commonly used carbon dioxide capture method is the chemical absorption method, which uses organic amines as absorbents to combine with...

AI Technical Summary

Problems solved by technology

However, the technical solution does not carry out resource treatment for the liquid and solid produced in the treatment, and the economic utilization performance is low

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