Blast furnace coal gas full-dry purification system and process flow thereof

Abstract

The invention belongs to the field of the metallurgy industry, and relates to a blast furnace coal gas full-dry purification system and a process flow of the blast furnace coal gas full-dry purification system. The blast furnace coal gas all-dry purification system comprises a blast furnace and a blast furnace waste coal gas purification system communicating with the blast furnace. The blast furnace waste coal gas purification system is connected to bag-type dust removers through waste coal gas pipelines. The bag-type dust removers are connected to parallel TRT systems and pressure reducing valve sets with silencers through net coal gas outlet master pipes and then communicate with a net coal gas pipe net. A net coal gas outlet of each bag-type dust remover is provided with an outlet net coal gas branch pipe blind plate valve. The outlet net coal gas branch pipe blind plate valves are provided with outlet branch pipelines and coal gas pressure relief branch pipes in parallel. Pressurerelief coal gas branch pipe butterfly valves are arranged on the coal gas pressure relief branch pipes. Outlet net coal gas branch pipe butterfly valves are arranged on coal gas outlet branch pipes. The coal gas pressure relief branch pipes are provided with a coal gas pressure relief master pipe in a collecting mode. The coal gas pressure relief master pipe communicates with the net coal gas pipenet. A dense-phase ash conveying technology is adopted. By means of the blast furnace coal gas full-dry purification system and the process flow of the blast furnace coal gas full-dry purification system, requirements of bag-type dust removal technology on the use of nitrogen are reduced, the abrasion of an ash conveying pipeline is reduced, and the operation cost is saved.

Description

technical field [0001] The invention belongs to the field of metallurgical industry, and relates to a blast furnace gas full-dry purification system and a process flow thereof. Background technique [0002] Compared with the original wet dust removal, the dry bag dust removal has the advantages of no water pollution, low energy consumption, and low operating costs; in response to the country's basic national policy of protecting the environment and saving resources, the old small blast furnaces are gradually eliminated, and new construction and expansion for Large and medium-sized blast furnaces; at the same time, the bag dust removal system is the first choice for blast furnace gas dust removal. The existing dry bag dust removal solution has a large nitrogen pulse back blowing nitrogen consumption, a large clean gas pressurization back blowing power consumption, and in special industries. There are problems such as unclean gas backflushing and bag compaction, large nitrogen...

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Problems solved by technology

[0002] Compared with the original wet dust removal, the dry bag dust removal has the advantages of no water pollution, low energy consumption, and low operating costs; in response to the country's basic national policy of protecting the environment and saving resources, the old small blast furnaces are gradually eliminated, and new construction and expansion for Large and medium-sized blast furnaces; at the same time, the bag dust removal system is the first choice for blast furnace gas dust removal. The existing dry bag dust removal solution has a large nitrogen pulse back blowing nitrogen consumption, a large clean gas pressurization back blowing power consumption, and in special industries. Problems such as unclean gas backflushing and bag compaction, large nitrogen consumption in dilute phase ash conveying, and serious wear and tear of ash conveying pipelines

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