Technological method of removing hydrogen chloride through powder injection of blast furnace gas pipeline and device of removing hydrogen chloride through powder injection of blast furnace gas pipeline

Abstract

The invention discloses a technological method of removing hydrogen chloride through powder injection of a blast furnace gas pipeline and a device of removing hydrogen chloride through powder injection of the blast furnace gas pipeline. The device utilizing the technology of adopting blast furnace gas pipeline powder injection to remove hydrogen chloride adopts the dry type blast furnace gas injecting dechloridation technology to remove hydrogen chloride; a dechlorination agent bag-type dust collector hopper, a pulverizer and a draught fan are sequentially mounted on a pipeline behind a dry process coarse dust remover and in front of the bag-type dust collector of the existing device; and the condition of blast furnace gas in an outlet pipeline of the dry process coarse dust remover is set; through grinding, the dechlorination agent obtains a larger specific surface area, and the ground dechlorination agent is directly injected in the blast furnace gas pipeline for dechloridation reaction through the powder injection manner. With adoption of the technical scheme, the one-time investment is less, the occupied area is small, and the system is simple in operation and convenient to maintain. The technology can effectively improve the contact uniformity and sufficiency of the dechlorination agent and blast furnace gas, improves the dry process dechlorination effect, is low in heat loss of blast furnace gas and does not affect later application of TRT.

Description

technical field [0001] The invention relates to the technical field of blast furnace gas purification, in particular to a process and a device for removing hydrogen chloride by powder spraying in a blast furnace gas pipeline. Background technique [0002] In recent years, domestic iron and steel enterprises have generally adopted dry-type bag filter technology for blast furnace gas, which has brought great economic and social benefits. However, with the continuous accumulation of production experience, it has been found that when the blast furnace gas adopts full dry bag dust removal, because the gas contains ammonia, chlorine, sulfur and other impurities, the blast furnace gas residual pressure turbine power generation unit (Blast Furnace Top Gas Recovery Turbine Unit) , hereinafter referred to as TRT), pipeline system and auxiliary equipment, there are a lot of salt accumulation and corrosion problems, which have brought huge economic losses to the enterprise, and also gre...

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Problems solved by technology

[0006] Most of the existing blast furnace gas fixed-bed dechlorination technologies have the following problems: 1. The on-site blast furnace gas purification equipment is compact, and there is no extra space on site to install additional dry-type acid removal adsorption towers; 2. Several types of acid removal adsorption towers are put into use. 3. There will be a lot of dust at the outlet of the dechlorination tower, and a filter device must be added; 4. The dechlorination agent is consumable, and it must be replaced after it penetrates. The dechlorination tower At least two units must be installed to ensure continuous production. Disassembling and assembling the dechlorination agent consumes manpower and material resources, which greatly increases the operation and maintenance cost of the device; secondary pollution to the environment

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