Low energy consumption flue gas wet desulphurization process

Abstract

The invention provides a low energy consumption flue gas wet desulphurization process. A desulphurizing tower is adopted as a sulphur dioxide absorber, flue gas after primary dust removal reacted with cleaning solution containing alkaline absorbing agent in reverse washing cycle to remove sulphur dioxide in the flue gas, meanwhile part of circulating water (determined according to desulphurization product amount) is extracted and enters into a flue gas crystallizing evaporator to be evaporated before the desulphurization tower, and temperature of the flue gas is reduced while desulphurization product is separated out by crystallization. The process of the invention utilizes flue gas crystallizing evaporator to evaporate desulphurization product, thus substituting desulphurization product dehydration equipment; flue gas waste heat is effective utilized and substitutes energy consumption in dehydration of desulphurization product, water consumption in dehydration process is reduced, thus being applicable to flue gas sulphur dioxide removal by adopting calcium series or ammonia series (liquid ammonia, ammonia water, ammonium acid carbonate) desulphurizing agent; and operation energy consumption is low, thus having good economic benefit and social benefit.

Description

technical field [0001] The invention relates to flue gas desulfurization technology, in particular to a flue gas wet desulfurization process that can be applied to industrial sites and effectively reduces investment and operation energy consumption. Background technique [0002] my country is a country with a coal-based energy structure. A large amount of fossil fuels are used for domestic heating and industrial production. With the continuous growth of coal consumption, a large amount of carbon dioxide and sulfur dioxide are emitted. The carbon dioxide in the atmosphere causes the greenhouse effect. It warms the climate and constitutes a long-term hazard; the accumulation of sulfur dioxide will form acid rain, which will endanger the normal survival and life of surface animals and plants. Seeking a flue gas desulfurization technology with low investment and low energy consumption is a long-term pursuit of people, which is in line with people's goal of pursuing a low-carbon l...

AI Technical Summary

Problems solved by technology

At the same time, the dehydration of desulfurization products requires new equipment investment, and the dehydration process will increase the water consumption again. At the same time, accompanied by the consumption of a large amount of mechanical energy or heat energy, the whole process consumes a lot of energy and water. The technology is not easy to promote and use in a large area

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