Combined two-stage flue gas desulfurization and dust-eliminating process

Abstract

The invention refers to a compound double-grade smoke desulfurizing and dust eliminating process which can desulfurize sulfur and eliminate dust effectively. It is made up of the first, the second and the third parts: the first part is ceramics multi-pipe dust catcher or electrostatic dust catcher, it carries on the first grade dust eliminating, it eliminates 90-99% dust in the smoke; the second part is venturi drying and absorbing tower, the sulfur in smoke reacts with desulfurizing liquid and is absorbed, realizes the first grade desulfurizing; the third part is bag desulfurizing and dust catcher, it eliminates the resultant in desulfurizing reaction and carries on secondary dust eliminating to the tiny particles in smoke.

Description

Technical field: [0001] The invention relates to a composite two-stage flue gas desulfurization and dust removal purification process suitable for coal-fired furnaces and high-dense phase flue gas containing dust and sulfur. Background technique: [0002] The current flue gas desulfurization and dust removal process is divided into wet method and dry method. Calcium substances are mostly used as desulfurizers. The wet flue gas desulfurization and dust removal process is to remove dust and purify the flue gas first, and then the flue gas containing sulfur dioxide performs mass transfer and heat exchange with the alkaline aqueous solution containing calcium hydroxide in the absorption tower to remove sulfur dioxide in the flue gas. The wet flue gas desulfurization and dust removal process includes a circulating water system, a sewage concentration system, an ash-water separation system, a moisture-containing product treatment system, and a desulfurizer preparation system. Th...

AI Technical Summary

Problems solved by technology

Because the dry flue gas desulfurization and dust removal process belongs to the mass transfer between solid powder particles and gaseous flue gas, the efficiency of mass transfer and absorption is low

At the same time, when the solid powder desulfurizer reacts with the sulfur dioxide in the flue gas, the surface of the powder particles is first adsorbed and saturated, which increases the resistance of the reaction between the inner core of the powder particle and the sulfur dioxide, so that the solid powder desulfurizer cannot completely react with the sulfur dioxide in the flue gas. respond adequately

Even if the technical measures of repeated use of desulfurization agent are adopted, the utilization rate of desulfurization agent can only be partially improved, but the desulfurization efficiency cannot be improved

Therefore, the current dry flue gas desulfurization and dust removal process has low desulfurization efficiency and large calcium-sulfur ratio, which increases the consumption of desulfurizer and increases the operating cost

At the same time, the nozzle pipeline system wears a lot, and the maintenance workload increases

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