Gas totally-drying purifying dust-collecting process of blast-furnace

Abstract

The invention is about the blast furnace gas oven-dry decontamination dedusting technology. The dust-laden gas enter the gravity dust separator firstly, then enter the every dedusting subsystem pipes through the main pipe, next to enter the every bag-type dust collector to remove the dust precisely, then the cleaning gas enter the system purified gas pipe to enter the supplying purified gas pipe net through the dry-type turbine or the reducing valve. The bag-type dust collector system includes at least more than three dedusting subsystems which include at least more than five dedusting boxes, and the shutoff device is installed in the gas pipe. The invention achieves the blast furnace gas oven-dry bag-type dedusting, so it can increase the gas latent heat and the electric power generation ratio.

Description

【Technical field】 [0001] The invention relates to a blast furnace gas full-dry purification and dust removal process capable of improving the reliability of system operation and realizing full-dry bag dust removal. 【Background technique】 [0002] Glossary: ​​TRT: Blast furnace gas residual pressure recovery turbine generator set [0003] At present, there are two methods of dedusting blast furnace gas: one is dry dedusting of blast furnace gas, and the other is wet dedusting of blast furnace gas. Because dry dedusting of blast furnace gas has obvious energy-saving advantages compared with wet dedusting, it has become the current large-scale blast furnace dedusting method. The development direction of gas purification. [0004] Blast furnace gas bag dust removal process belongs to dry dust removal. This method mainly has the following problems: many process pipelines, pipeline compensators, control valves, dust collectors and other single equipment, resulting in high system ...

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Problems solved by technology

[0004] Blast furnace gas bag dust removal process belongs to dry dust removal. This method mainly has the following problems: many process pipelines, pipeline compensators, control valves, dust collectors and other single equipment, resulting in high system failure rate, poor system reliability, single unit Equipment failure treatment requires system shutdown, which affects blast furnace production; due to the large number of single equipment and high failure rate of this method, it is only suitable for 2000m 3 Blast furnace gas dedusting below level is currently only used for 1800m2 at home and abroad 3 The following blast furnace gas dedusting

[0005] Existing 2000m 3 Blast furnace gas dedusting above the first grade mainly adopts wet dedusting or dry bag dedusting plus humidification dedusting (mutual backup), wet dedusting is not conducive to energy saving, and is not conducive to environmental protection; dry dedusting bag plus humidification dedusting, large investment, not conducive to energy saving, It is also not conducive to staffing and operation, and it is not economical to operate

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