Dry dust collection method and apparatus for blast furnace gas

Abstract

A blast furnace gas dry type dust collection method, a paralleled gas drying equipment is provided after the gravity dust collector and before the cloth bag dust remover in the blast furnace gas dry type dust collection system as a constituent part of the blast furnace gas dry type dust collection system, and a temperature sensor is provided on the export of the gravity dust collector; when the system export (the blast furnace) generates low-temperature raw coal gas, the humidity is usually relatively high, before the cloth bag dust remover performs dust exhaustion, the gas from the export of the gravity dust collector passes through the paralleled gas drying equipment, the gas drying equipment firstly performs dehumidification processing to the raw coal gas to remove the water in the raw coal gas, and then enters into the cloth bag dust remover for dust exhaustion; when the temperature of the blast furnace raw coal gas is in a normal range, the blast furnace raw coal gas enters the gravity dust collector through a raw gas pipeline to perform coarse dust exhaustion, and then directly enters the cloth bag dust remover for dust exhaustion, the clean gas after dust exhaustion enter in the pressure reducing valve through a clean gas pipeline for pressure reduction, and finally loads in a gas holder through the clean gas pipeline.

Description

technical field [0001] The invention belongs to the technical field of dedusting, and in particular relates to a new blast furnace gas dry dedusting process with a dehumidification device, including a dedusting method and device. Background technique [0002] The existing blast furnace gas dry dedusting process is mainly composed of raw gas pipelines, gravity dust collectors, bag filter, pressure reducing valve group, clean gas pipelines and vent chimneys. Among them, the bag filter, which plays the main role of dust removal, treats the gas temperature between 90°C and 250°C. If the gas temperature is too low, the filter bag will condense and the dust will stick together, which will not only increase the damage of the filter bag, but also cause difficulties in ash unloading and transportation, directly affecting the normal operation of the dust removal system. In order to make the bag filter operate normally, the gas with too low temperature is never allowed to enter the ba...

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Problems solved by technology

[0003] The object of the present invention is: in order to enable the dust removal system to process low-temperature gas, avoid environmental pollution, and recover more energy. The task of the present invention is to provide a new technology and special device for blast furnace gas dry dust removal with a gas dehumidification device. It solves the problem that the existing blast furnace gas dry dust removal process cannot handle low-temperature gas but can only be released

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