A blast furnace gas bag type dust removal device

Abstract

The invention discloses a bag type dust collection device blast-furnace gas. The bag type dust collection device comprises an upper box body and a lower box body which are separated by a separation net. An air inlet is formed in one side of the lower box body, and an ash bucket is arranged below the lower box body. A gravitational dust collector connected with the air inlet is arranged in the lower box body, and the gas outlet of the gravitational dust collector is connected with a cooler. An air outlet and an access door are arranged at the top of the upper box body, and a filtering device is arranged inside the upper box body. The bag type dust collection device has the advantages that filter bags are horizontally and obliquely arranged, the horizontal inclination angle of the filter bags is 30-45 degrees, the surfaces of the filter bags are coated with super-hydrophobic coating, so that the gas filtering effect is improved by the filter bags adopting the structure, settled dust particles on the surfaces of the filter bags can directly slip off from the surfaces of the filter bags without a dust removing device, the service life of the filter bags is prolonged, and the surfaces of the filter bags are prevented from being blocked by the settled dust particles; the bore diameters of the filter bags arranged from bottom to top sequentially decrease in, so that the filter bags can intercept particles with different particle sizes, a filtering effect is improved, and the purified blast-furnace gas can meet the national environmental protection emission standards.

Description

technical field [0001] The invention relates to the field of bag-type dedusting devices, in particular to a blast furnace gas bag-type dedusting device. Background technique [0002] During the smelting process, the blast furnace produces a large amount of high-temperature raw gas containing CO and dust, and its calorific value is generally 2000-3100 kcal / m 3 , which belongs to low calorific value gas, has become an important secondary energy source for iron and steel enterprises just like converter gas. If it is not treated and recycled, it will pollute the environment, endanger physical and mental health and waste energy. Most of the existing blast furnaces use nutrient-rich coal injection and humidified blast to strengthen smelting. The gas contains more water. The blast furnace blowers are specially designed with high power and high pressure. However, when the furnace condition fluctuates due to fluctuations in the composition and quality of the furnace charge, the blas...

AI Technical Summary

Problems solved by technology

However, when the furnace condition fluctuates due to fluctuations in the composition and quality of the furnace charge, the blast furnace gas flow rate, pressure, and dust concentration will change greatly, which will affect the purification effect of the blast furnace gas.

Due to the existence of the above problems, the blast furnace gas purified by the dust removal device cannot meet the national environmental protection emission standards

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