Preparation method of wet desulphurization absorbent for flue gas from coal fired boiler

Abstract

The invention discloses a preparation method of a wet desulphurization absorbent for flue gas from a coal fired boiler. The method comprises the following steps: (1) selecting fly ash from combustion of low sulfur coal, selecting limestone powder and screening the fly ash and limestone powder respectively; (2) weighing the limestone powder according to a calcium sulfur molar ratio of 0.7-1.1; (3) weighing fly ash according to a mass ratio of fly ash to limestone being 0.5-1; (4) determining weight of water in the desulphurization absorbent, according to a volume flow of the flue gas from the coal fired boiler and a weight to volume ratio of liquid to gas being 101-161 g / m<3>; (5) adding fly ash into water, stirring uniformly and carrying out hydration treatment; and (6) adding limestone powder into the fly ash slurry treated with hydration treatment and stirring uniformly to obtain the desulphurization absorbent. The desulphurization absorbent can effectively increase desulphurization efficiency of a wet method flue gas desulphurization system and substantially reduce operating cost of the system.

Description

technical field [0001] The invention relates to the field of flue gas desulfurization, in particular to a method for preparing a wet desulfurization absorbent for coal-fired boiler flue gas. The desulfurization absorbent is suitable for flue gas desulfurization of large coal-fired power plant boilers. Background technique [0002] Soot-type air pollution is the main form of air pollution in my country where coal is the main energy source. The main pollutant of soot-type air pollution is SO 2 , currently, by SO 2 The air pollution caused has become an important factor restricting the sustainable development of my country's national economy and society. 2 The emission of air pollution has become the most urgent task in the field of air pollution control in my country. [0003] Wet flue gas desulfurization technology uses liquid desulfurization absorbent to desulfurize SO in flue gas 2 For chemical absorption technology, the entire desulfurization system is located at the b...

AI Technical Summary

Problems solved by technology

At present, the wet flue gas desulfurization technology developed in the world can be divided into limestone washing method, double alkali method, Wellman-Lord method, magnesium oxide method and ammonia method according to the material composition of the desulfurization absorbent. Each flue gas desulfurization technology has its own advantages and disadvantages, but there are also problems such as scaling, corrosion, huge investment, large power consumption, and high operating costs to varying degrees.