Flue gas desulphurization and denitration reactant integrated supply method and apparatus

Abstract

An integrated supply method by using ammonia water as a desulphurization and denitration reactant contains the following steps of: 1) ammonia water evaporation: part of ammonia in inputted concentrated ammonia water is evaporated by controlling the temperature and pressure of an evaporator and other components are remained in the ammonia water; 2) gaseous ammonia storage and its use for denitration: a buffer tank is configured to store the gaseous ammonia generated from the ammonia water evaporation under a certain pressure so as to supply ammonia for a denitration apparatus and stabilize the operation of the evaporator; and 3) dilute ammonia water storage and its use for desulphurization: a dilute ammonia water groove is correspondingly configured to store the ammonia water, the concentration of which is reduced after the original ammonia water is evaporated into the gaseous ammonia, and the dilute ammonia water is used for flue gas desulphurization. The operation pressure and concentration of the evaporator are stabilized by extraction of the dilute ammonia water from the evaporator, and simultaneously ammonia water is stably supplied for the flue gas desulphurization apparatus. The inputted concentrated ammonia water is stored in a concentrated ammonia water groove and enters into the evaporator from the concentrated ammonia water groove. Ammonia is evaporated into a gas phase after being heated by a heater of the evaporator. The gaseous ammonia is used for denitration and the dilute ammonia water is used for desulphurization.

Description

technical field [0001] The present invention relates to an integrated supply process and device for desulfurization and denitrification reactants of coal-fired flue gas in the field of environmental protection. After treatment, it can be used as a reactant for desulfurization and denitrification to realize an integrated process with no residue and energy saving. Background technique [0002] my country is a developing country with coal as the main fuel, and the environmental pollution caused by coal combustion is becoming more and more serious. 2 , NO x very important. [0003] Due to the advantages of high desulfurization efficiency, no secondary pollution, low operating costs, and high device feasibility, ammonia flue gas desulfurization technology is more and more widely used in China. The reactants of ammonia desulfurization can be liquid ammonia, ammonia water, carbon Ammonium, urea and other alkaline substances containing ammonia. [0004] At present, flue gas deni...

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Problems solved by technology

Moreover, many chemical and fertilizer enterprises in China have by-product ammonia water. If the complete evaporation method commonly used abroad is used to evaporate all the ammonia water, not only will the energy be high, but also part of the impurities in the ammonia

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