Dry-process dust-removing and dechlorination combined device for blast furnace gas

Abstract

The invention discloses a dry-process dust-removing and dechlorination combined device for blast furnace gas. The device comprises a power generation device and a reducing valve group which are connected to the back of a blast furnace through a pipeline and connected with each other in parallel, and is characterized in that a grain bed dust remover before the power generation device and the reducing valve group is connected in series with the power generation device and the reducing valve group; and dechlorination grains, desulfuration grains and deamination grains are filled in the grain bed dust remover. The device can be used for conducting dust removing, dechlorination, desulfuration, deamination, moisture absorption, and recycling of residual heat and excess pressure on blast furnace gas effectively, and has the advantages as follows: the suitability on ingredient variation of blast furnace gas is high; problems of corrosion on equipment and pipelines and salification caused by dry-process dust removing are solved; and no corrosion-resistant measure is required in pipelines and equipment to follow-up users. The dust content of purified gas at the outlet of the device is 0 to 5 mg / Nm<3>; the chloride ion content in gas condensed water is smaller than 300 mg / L; and the pH value is 6 to 8.

Description

technical field [0001] The invention relates to a gas purification device. technical background [0002] The crude gas produced during blast furnace smelting contains dust and harmful media such as chlorine, sulfur, ammonia, etc. For the treatment of blast furnace gas, it is necessary to meet the requirements of dust removal accuracy (the dust content of purified gas is ≤5mg / Nm 3 ), and to remove chlorine, sulfur, ammonia and other harmful media in the gas, and to recycle the waste heat and pressure of the blast furnace gas as much as possible. [0003] At present, the dust removal methods for blast furnace gas at home and abroad are completed in two stages. The first stage uses inertial dust collectors for coarse dust removal, such as gravity dust collectors or cyclone dust collectors; the second stage mainly includes the following two types of fine dust removal methods: 1) wet Method: This method uses a circular seam scrubber to purify blast furnace gas. Old steel mills a...

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Problems solved by technology

[0003] At present, the dust removal methods for blast furnace gas at home and abroad are completed in two stages. The first stage uses inertial dust collectors for coarse dust removal, such as gravity dust collectors or cyclone dust collectors; the second stage mainly includes the following two types of fine dust removal methods: 1) wet Method: This method uses a circular seam scrubber to purify blast furnace gas. Old steel mills also use double-text scrubbers. Wet dust removal has the advantages of mature and reliable systems and low investment, but wet dust removal consumes a lot of water resources, making the blast furnace Gas temperature drops below 70°C, wasting waste heat resources of blast furnace gas

2) Dry bag dust removal: In response to the national policy requirements for energy conservation and environmental protection, a large number of domestic blast furnaces adopt dry dust removal technology. This technology has been relatively mature and has produced good energy-saving benefits. , sulfur, ammonia and other media, the new problems of compaction of bag filter, rapid corrosion of gas pipeline and auxiliary equipment, and salt accumulation have become prominent contradictions hindering the use of this technology

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