Complete recovery system and method for iso-pressure blow-off gas at blast furnace top

Abstract

The invention discloses a complete recovery system for iso-pressure blow-off gas at blast furnace top. The complete recovery system comprises a furnace top charging bucket of a blast furnace, a cyclone dust collector, an ejector and a bag-type dust collector, wherein the furnace top charging bucket is communicated with the cyclone dust collector through a first pipe; an outlet of the first pipe iscommunicated with an inlet of a three-way joint; a first outlet of the three-way joint is communicated with a second pipe; the ejector and a forced recovery valve are arranged on the second pipe; anoutlet of the ejector is communicated with an inlet of the bag-type dust collector; an outlet of the bag-type dust collector is communicated with a purified gas pipe network; a natural recovery valveis arranged on a third pipe, and an outlet of the third pipe is communicated with an inlet valve of the bag-type dust collector; a second outlet of the three-way joint is communicated with a fourth pipe. The invention further discloses a complete recovery method for the iso-pressure blow-off gas at the blast furnace top. The complete recovery system and method for the iso-pressure blow-off gas atthe blast furnace top have the following beneficial effects: two recovery measures are taken correspondingly according to the change of pressure in the furnace top charging bucket, environmental pollution and resource waste caused by direct blow-off of iso-pressure gas into the atmosphere are avoided, and the requirements for energy saving, emission reduction and environmental production are met.

Description

technical field [0001] The invention belongs to the technical field of gas purification and recovery, and in particular relates to a system and method for full recovery of blast furnace top pressure-equalized and diffused gas. Background technique [0002] The gas released from the blast furnace bellless top tank contains a large amount of dust, CO and a small amount of H2, CH4 and other toxic and flammable mixed gases. It must be released directly into the atmosphere before each charging. It will cause serious pollution to the atmospheric environment, especially the blast furnace production area, and also waste part of the gas energy. [0003] During the normal production process of the blast furnace, the charging equipment on the top of the furnace periodically receives materials, equalizes pressure, discharges materials, and releases the equalized gas. Therefore, in the normal production process of the blast furnace, the equalized gas is released intermittently and period...

AI Technical Summary

Problems solved by technology

What this known technology adopts is wet dedusting, and needs to depressurize the gas through a dehydrator; however, the equipment is complicated, and the gas after treatment also has the defects of energy waste such as a significant drop in temperature and large water and electricity consumption.

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