Blast furnace gas dust removing device and technique by dry method

Abstract

The invention relates to a blast furnace gas dry cloth-bag dust-removing device and technology, belonging to the metallurgy environmental protection dust removing technical field. The blast furnace gas dry cloth-bag dust-removing device and technology mainly comprise devices such as a dust-removing filtering device, an ash-clearing device, a dust-unloading and transporting device, an automatic control device, a gas dispersion device, and technologies such as large filtering wind speed, nitrogen or pure coal gas pulse current back-blowing and ash-clearing, pneumatic unloading and transporting ash and backup for nitrogen and pure coal gas, wherein, coal gas is filtered and purified by a filtering bag, the ash is back-blown by nitrogen or pure coal gas pulse current so as to control the resistance of the dust remover, thereby the filtering bag has the ideal dust removing effect, which is a dry dust-removing purification system having the advantages of high dust-removing efficiency, low dust content of the pure coal gas, low energy consumption of the dust-removing system, high heat efficiency of the pure coal gas and high automation degree; the filtering bag with over-long specification and a biserial pulse back-blowing system are adopted to meet the requirements of the dust-removing system upon a large filtering area and an excellent back-blowing efficiency; a crude gas bleeding valve group is increased to ensure that the coal gas with overproof temperature can not enter to a case of the dust remover, which protects the cloth-bag, controls effectively the high furnace roof pressure and operates the system more safer; the whole course waterless operation is realized so as to prevent the possibility of water containing coal gas dust to paste the filtering bag, thereby having the characteristics of less occupied area, short technology process, strong ability of clearing the ash, simple equipment and low labor intensity.

Description

1. Technical field: [0001] The invention belongs to the field of metallurgical environmental protection dust removal, and relates to a bag dust removal device and process 2. Background technology: [0002] With the development of the economy and the advancement of science and technology, the demand for steel at home and abroad is increasing. Now, my country has become the world's largest steel producer; energy saving, cost reduction, efficiency improvement, environmental protection, and pollution reduction It has become the goal pursued by my country's metallurgical industry. In the past, blast furnace gas, which was discharged as waste gas, has been fully and widely used as an important energy source. Especially since the 1990s, with the expansion of the use of blast furnace gas , the requirements for the purity of blast furnace gas are getting higher and higher. [0003] Baotou Steel is an important iron and steel production base in my country. Its 4# blast furnace was put ...

AI Technical Summary

Problems solved by technology

[0006]In order to overcome the problems of high energy consumption, high water content of net gas, low thermal efficiency of gas, low output of blast furnace gas residual pressure power generation facilities and net gas content in blast furnace gas wet purification system The present invention provides a dry dust removal and purification system with high dust removal efficiency, low dust content in clean gas, low energy consumption of the dust removal system, high thermal efficiency of clean gas, and high degree of automation.

Images