Simultaneous desulfuration and denitration technique by wet flue gas method

Abstract

The invention provides a process which carries out desulfurization and denitration at the same time by a smoke wet-method; the smoke to be purified enters an absorbing reactor and is sufficiently contacted with absorbent containing alkali desulfurizer (such as one out of lime, limestone, Na alkali or alkali wastewater), urea and strong oxidant, and the SO2 and NOx in the smoke can be purified at the same time. When the process of the invention is adopted to purify the smoke, more than 90% of desulfurization and 50-95% of denitration efficiency can be achieved. The process of the invention realizes the desulfurization and denitration at the same time on the basis of alkali desulfurizer wet-method desulfurization process widely adopted at present; furthermore, the absorbent has wide source and low cost; the dosage of the strong oxidant is small, and the desulfurization and denitration efficiency is high so as to generate larger environmental benefits with less investment.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a flue gas wet simultaneous desulfurization and denitrification process. Background technique [0002] my country's air pollution is very serious, especially in economically developed areas, the frequency of acid rain is still increasing, and there is a tendency to change from sulfuric acid to sulfuric acid compound type, nitrogen oxides may replace sulfur oxides as the main source of acid rain, so flue gas At the same time, desulfurization and denitrification are very urgent. Regarding flue gas desulfurization and denitrification technology, extensive research and large-scale engineering practice have been carried out at home and abroad, but most of the technologies currently used are equipped with desulfurization and denitrification devices in the boiler tail flue gas section. The system is complex and resistant, the investment and operation costs are ...

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Problems solved by technology

Wet flue gas simultaneous desulfurization and denitrification process has been studied in China. The applicant of this patent has studied urea / additive simultaneous desulfurization and denitrification (Chinese patent application authorization announcement number CN 1192814C, CN 1139422C). Later, someone studied urea / strong oxidant simultaneous desulfurization and denitrification And urea / alkaline earth metal desulfurization and denitrification processes simultaneously, these processes do not consider the connection with the absorbent used in the existing wet desulfurization process, the desulfurization and denitrification processes will consume more expensive urea, and the operating costs are higher

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