Blast furnace gas cloth bag dedusting process

Abstract

The invention provides a bag type dust removing technology for blast furnace gas, which has the process flow as follows: (A) waste blast furnace gas which flows out from a blast furnace is processed through rough dusting by a gravity dust collector and then become half-cleaned gas; (B) the half-cleaned gas obtained from the (B) passes through a temperature buffer device, the temperature disturbance of the half-cleaned gas is buffered, and then the half-cleaned gas enters into a bag filter; (C) after being processed through refined dust removing by the bag filter, the half-cleaned gas becomes clean gas, which becomes low-pressure and low-temperature clean gas provided with chloride ions through the power generation by a TRT device or a reducing valve set, and then the clean gas provided with the chloride ions enters into a chlorine removing device; dust collected by the bag filter is transferred to a large dust storehouse by a dense-phase dust conveying device; (D) the dust becomes clean gas after being dechlorinated by the chlorine removing device, and enters into a gas pipe network for being used by a user. The temperature disturbance of the gas which enters into a bag is buffered, thereby preventing the bag from burnout or preventing the bag from scorching caused by the caking; by adopting the dense-phase dust conveying manner, the bag type dust removing technology has the characteristics that the conveying capacity is big, the energy consumption is low, etc.

Description

technical field [0001] The invention relates to a gas purification process in blast furnace smelting production in the metallurgical industry, in particular to a blast furnace gas dry bag dust removal process with large furnace capacity and high top pressure. technical background [0002] Dry bag dust removal mostly uses various high-porosity woven fabrics or filter felts to capture dust particles in dust-laden gases. Diffusion and electrostatic attraction are captured to achieve the purpose of dust removal. The temperature potential of the gas is not lost, and it can be recovered in TRT residual pressure power generation. It has incomparable advantages over wet dust removal. It does not need to consume washing water, has no water pollution, and will not lose the latent heat of gas, so that the TRT in the subsequent process can generate more than 35% more electricity, and the benefits of energy saving and environmental protection are remarkable. [0003] However, in the act...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problems that the existing technology cannot effectively control the temperature of the gas entering the bag, the content of chloride ions in the gas is high and the dust removal process adopts dilute phase output, the invention provides a blast furnace gas bag dust removal process, which can buffer the temperature of the gas entering the bag Disturbance, removal of chlorine ions in the gas, and the dust removal process uses dense phase output

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