Purification method of sulphur-containing flue-gas

Abstract

The invention relates to a purification method of sulfur-bearing flue gas, which belongs to the chemical field. The invention solves the technical problem of providing the purification method of sulfur-bearing flue gas with simple process steps. The purification method of sulfur-bearing flue gas comprises the following steps: a, a first dust removal is implemented to the sulfur-bearing flue gas through a cyclone dust collector; and b, the sulfur-bearing flue gas undergoing the first dust removal is filtered by a filter taking FeAl intermetallic compound porous material as a filtering element. Compared with the existing sulfur-bearing flue gas purification method, the invention eliminates the corresponding cooling equipment, shortens the process flow, improves the production efficiency, reduces the environmental pollution, lowers the production cost, and has broad application prospect.

Description

technical field [0001] The invention relates to a method for purifying sulfur-containing flue gas and belongs to the field of chemical industry. Background technique [0002] In my country's high-temperature industries, such as metallurgy, chemical and energy industries, industrial processes such as the separation and combustion of a large amount of petroleum gas, coke oven gas and coal gas, the calcination of sulfur-containing minerals, and the combustion of coal in thermal power plants will generate a large amount of high-temperature Sulfur-containing flue gas (mainly SO 2 and a series of oxide dust), the effective purification of this high-temperature flue gas containing sulfur dioxide has become a key technology to improve product quality, save energy, reduce production costs and reduce environmental pollution. [0003] At present, my country's non-ferrous metal smelters mainly use bag filters to separate solid and gas from this high-temperature sulfur-containing flue ga...

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Problems solved by technology

[0005] 1. The bag itself is not resistant to high temperature, so a pre-cooler must be used to cool the high-temperature sulfur-containing flue gas, which not only increases energy consumption, but also increases production costs;

[0006] 2. The filtering accuracy of the cloth bag is poor, and it cannot intercept the fine dust in the sulfur-containing flue gas. On the one hand, the valuable resources in the fine dust are wasted, which is not conducive to the recycling of valuable resources in the sulfur-containing flue gas; on the other hand , because a single bag filter cannot meet the quality requirements of the follow-up processing technology for sulfur-containing flue gas, therefore, it must be supplemented by a follow-up dust removal process, that is, further purification by means of dust removal such as Venturi dust collector and electrostatic precipitator, which brings The treatment of a large amount of waste water and the subsequent drying of sulfur-containing flue gas complicate the purification process, reduce production efficiency, and increase production costs

[0007] 3. The separation effect of the bag filter is unstable, and its filtration accuracy has a large attenuation range with the running time, and the service life is short. It needs to be replaced in about 3 to 6 months, which increases the filtration cost.

So far, there is no report on the application of this FeAl intermetallic compound porous material to directly filter sulfur-containing flue gas at high temperature

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