Technology for deeply removing and recycling SO2 in high-sulfur coal-fired power plant tail gas

Abstract

The invention relates to a technology for deeply removing and recycling SO2 in high-sulfur coal-fired power plant tail gas. Na2SO3 is used to absorb sulfur dioxide in smoke, so complete recycling of an absorbent is realized, and the recycling of sulfur dioxide and the production of high-added value products are also realized. The technology solves a series of problems of much salt-containing wastewater, easy obstruction and poor absorption effect of existing wet desulphurization, realizes the deep removal of sulfur dioxide (the sulfur dioxide content is reduced to below 35 mg / m<3>) and the high removal of solid particles (the solid particle content is reduced to below 5 ppm), and makes the carbon dioxide recovery rate reach 50-60%. Recovered SO2 is purified to make the purity meet the thionyl chloride production requirements, and is processed to obtain thionyl chloride with the purity of 99.6%.

Description

technical field [0001] The invention belongs to the field of chemical production technology, and specifically relates to the development of a technology for deep removal and resource utilization of sulfur dioxide in the tail gas of high-sulfur coal coal-fired power plants. Background technique [0002] Coal accounts for 60% of my country's energy consumption, SO 2 80% of China's pollution emissions come from burning coal. Therefore, under the background of green chemical industry, energy saving and environmental protection, it will become the top priority to achieve deep removal of sulfur dioxide in flue gas and realize resource utilization. Although my country's coal resources are abundant and most of them are low-sulfur coal, but coal is a non-renewable resource, and the mining and utilization of high-sulfur coal will inevitably come. [0003] Dai Wenjun, Ren Long 【1】 Research on the existing flue gas desulfurization technology shows that the desulfurization technology ...

AI Technical Summary

Problems solved by technology

[0006] ① The unit volume absorbent has a greater ability to absorb sulfur dioxide;

NH 3 It is an option, but it will not only produce atomization and cause secondary pollution during the absorption process, but also the sale of the by-product ammonium sulfate will become a problem, so it is economically unfeasible

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