Dry method dedusting air supply method and dry method dedtusting air supply system

Abstract

The invention discloses a dry method dedusting air supply method and a dry method dedusting air supply system, and belongs to the technical field of dedusting. The method includes the following steps: confirming blast furnace air supply volume according to blast furnace volume and discharging capacity of a fourth blow off valve; opening the fourth blow off valve, supplying air for a blast furnace, then closing a second blow off valve, a third blow off valve and a first blow off valve in sequence, and enabling coal gas of an air supply initial stage to release heat through the fourth blow off valve so as to preheat a whole coal gas pipeline system; and opening a dry method deduster to conduct dedusting process. The dry method dedusting air supply system comprises the first blow off valve, the blast furnace, the second blow off valve, a gravity deduster, the third blow off valve, a temperature sensor, the dry method deduster and the fourth blow off valve. According to the dry method dedusting air supply method and the dry method dedusting air supply system, the problems that coexistence of the drying method and a wet method is great in investment, much in land occupation and the like are solved, quick air supply after blast furnace maintenance is achieved, blast furnace smelting process is strengthened, production efficiency is improved, coal gas diffusion is reduced, and environment pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of dust removal, in particular to a method and system for dry dust removal and air feeding. Background technique [0002] In recent years, with the increasing pressure of energy saving and emission reduction, dry dust removal technology has been gradually popularized in ironmaking blast furnaces, which has greatly reduced the fresh water consumption of blast furnaces. However, during the maintenance of blast furnace air supply, in order to prevent dew condensation and clogging of the dust removal bag of the dry system, the gas temperature at the top of the furnace must be above 120°C for gas supply operation. The dry dust removal system cannot be put into operation simultaneously with the blast furnace production, and generally needs to be sent The dry dedusting system can only be put into operation about 3-8 hours after the wind blows. During this period, the blast furnace gas is released from the relief va...

AI Technical Summary

Problems solved by technology

Although the coexistence of two systems can solve the problem of gas supply after the blast furnace overhaul, but an extra wet system will increase the investment. At the same time, the wet system occupies more land, which often affects the general layout of the blast furnace

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