A water-ammonia flue gas desulfurization and dust removal process

Abstract

A water-ammonia flue gas desulfurization and dust removal process relates to the environmental protection treatment technology of sulfur-containing flue gas. The invention uses water as a desulfurizing agent to remove sulfur dioxide, sulfur trioxide and dust in a desulfurizing tower, uses ammonia as a neutralizing agent to carry out neutralization reaction, and carries out oxidation reaction with oxygen or air to obtain ammonium sulfate as a by-product. The neutralization reaction and oxidation reaction are carried out outside the tower, and the neutralization reactor and oxidation reactor used are tubular reactors. The invention has no contact between flue gas and ammonia, no aerosol generation, no ammonia escape, no scaling and wear on the internal parts and tower walls of the desulfurization tower, and no clogging of the nozzles, which can ensure long-term operation of the device. The invention has good desulfurization and dust removal effect, less device investment and low operation cost, and the obtained by-product ammonium sulfate is of good quality.

Description

technical field [0001] The invention relates to a wet flue gas desulfurization and dust removal technology, in particular to a wet desulfurization and dust removal technology using water as a desulfurizing agent and ammonia as a neutralizing agent. Background technique [0002] Wet desulfurization technology is currently the most widely used desulfurization technology at home and abroad. According to the type of desulfurizer, there are calcium method, sodium method, magnesium method, ammonia method and seawater method. Ammonia desulfurization is a high-efficiency, low-energy wet desulfurization method. It uses liquid ammonia, ammonia water and ammonium bicarbonate as desulfurizers to contact raw smoke to remove sulfur dioxide and sulfur trioxide. The biggest feature of the ammonia method is that sulfur dioxide can be used as a resource, and the pollutant sulfur dioxide can be converted into high-quality nitrogen fertilizer ammonium sulfate, which has a good market in my cou...

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Problems solved by technology

[0003] The existing ammonia technology generally has some technical difficulties, such as secondary pollution and ammonia loss caused by the escape of ammonia from the desulfurization tail gas; The problem of aerosol formed by becoming crystal seeds in water vapor; the clogging of the desulfurizing agent nozzle in the desulfurization tower, resulting in poor spraying, resulting in insufficient gas-liquid contact, resulting in a decrease in desulfurization effect, or the increase in operating costs caused by insufficient use of desulfurizing agent; desulfurization Scaling and wear of tower internals and tower walls; the problem that the entire system cannot run for a long period of time

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