Process for backblowing and deashing through bag-type dust remover by blast furnace dry method

Abstract

The invention relates to a process for backblowing and deashing through a bag-type dust remover by a blast furnace dry method. The pure blast furnace gas after the dust removal by the bag-type dust remover is used as a gas source to perform backblowing on the bag-type dust remover; and before the backblowing, the pure blast furnace gas after the dust removal by the bag-type dust remover is further deashed by a filter, and then is subjected to steps of temperature reduction, pressurization, dehydration and pressure regulation to meet the requirement of gas required by the bag body backblowing and deashing. The dust removal method of the process reduces requirements on nitrogen in the bag-type dust removal technology, and avoids the problem of bag backblowing caused by unstable pressure andinsufficient supply of nitrogen. The process has pollution-free operation, applies temperature swing adsorption, saves energy, reduces emission, simultaneously reduces the consumption of the nitrogen, safely and effectively reduces the cost of a blast furnace gas bag in the operation, and can be mainly applied to the bag-type dust removal of the gas of a large-sized blast furnace.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a process for backflushing and dust cleaning of a dry bag filter in the field of large-scale blast furnace gas dedusting in the metallurgical industry. Background technique [0002] Building a conservation-oriented society and saving energy is a basic national policy of our country and a strategic policy for the iron and steel industry to achieve sustainable development. Therefore, low-cost and high-efficiency have increasingly become the most important tasks of iron and steel enterprises, and energy conservation and emission reduction and the development of circular economy have become the mainstream of the development of iron and steel enterprises. In order to achieve the above goals, many iron and steel enterprises have begun to phase out small blast furnaces with high energy consumption and high added value. At the same time, they have begun to accelerate the expansion and...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method of backflushing and cleaning the bag body with clean blast furnace gas after dust removal by the blast furnace bag filter, which can alleviate the shortage of nitrogen supply in the blast furnace furnace area of ​​some steel plants, The problem of unstable pressure, while reducing the operating cost of bag dust removal

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