Device for recovering coal gas in equalizing and relieving process of furnace top of blast furnace

Abstract

The invention relates to a device for recovering coal gas in the equalizing and relieving process of a furnace top of a blast furnace and belongs to the technical field of the iron and steel industry. The device comprises a blast furnace weighing charging bucket, a equalizing and relieving pipeline connected with the charging bucket, a plurality of types of valves, a cyclone dust collector and a cloth bag dust collector connected in series behind the cyclone dust collector and is characterized in that an ejector is connected in series behind the cloth bag dust collector; crude gas which is equalized and relieved from the blast furnace weighing charging bucket enters the cyclone dust collector to carry out primary dust removal through the equalizing and relieving pipeline and then enters the cloth bag dust collector connected in series behind the cyclone dust collector to form clean gas; and under the action of the ejector, the clean gas is rapidly ejected and enters a clean gas pipe network, so that the rapid relief and recovery of the equalized and relieved coal gas in the weighing charging bucket are realized. The process is simple, is convenient to operate and has low operation and maintenance cost. Besides the economic benefits caused by the recovery of the coal gas, the coal gas and dust discharge can also be reduced so as to generate good social benefits; a conventional process is changed less; and the process is convenient to improve the existing conventional equalized and relieved coal gas system of the blast furnace.

Description

technical field [0001] The invention belongs to the technical field of iron and steel industry, and relates to a blast furnace top pressure equalization and release gas recovery device. Background technique [0002] The increasingly stringent environmental protection requirements and market situation in the steel industry require steel companies to save energy, reduce emissions, and reduce costs. At present, the blast furnace ironmaking process pollution emissions account for the majority of the entire iron and steel industry emissions, therefore, it is particularly necessary to reduce the ironmaking process emissions. [0003] At present, the traditional pressure equalization and release of blast furnace charging is to use semi-clean gas and nitrogen to equalize the pressure of the material tank to the pressure of the blast furnace top to realize the discharge into the blast furnace. When releasing, the raw gas in the material tank is passed through the cyclone After coars...

AI Technical Summary

Problems solved by technology

[0004] The current known new pressure-equalizing and diffused gas recovery process, or the recovery cost is too high, or can not achieve good gas recovery in industry, and cannot achieve both economic and environmental benefits at the same time

The application number is 201010209016.5, and the name is "gas recovery process and device in blast furnace charging and equalizing pressure release process". It discloses a technology for recovering the released gas into the net gas pipe network. Although the operation cost is low and the operation is simple, it mainly relies on Furnace top pressure is used as power to send clean gas into the gas pipe network. In actual use, it is difficult to achieve complete release of pressure-balanced diffused gas and effective recovery of clean gas.

Images