A dust recycling system for enhanced availability of Corex

Abstract

The present invention provides a dust recycling system for directly smelting reduction iron making process, which is used for increasing efficiency. The dust recycling system to capture dust from reduction gas and inject the same back into the melter gasifier for dust burning in a smelting reduction iron making process comprising a hot gas cyclone (HGC), a low dust bin (LDB) in operative connection to said hot gas cyclone for continuous flow of the captured dust through a hot knife gate and valve vertical pipelines provided at an inclination ranging from 4 to 12; said low dust bin (LDB) further operatively connected through a vertical pipeline and an inlet to a high dust volume T-piece (TP) comprising of injector and diffuser means; and a melter gasifier having dust burner to burn the dust thus recycled into the melter gasifier through said T-piece. The above system is adapted to favour effective and jam free transportation of dust from the hot gas cyclone to the dust burner and thereby improve plant availability/efficiency.

Description

technical field [0001] The invention belongs to the field of metal smelting, and in particular relates to a dust recovery system for a direct smelting reduction ironmaking (Corex) process for improving efficiency. Background technique [0002] It is currently known to be used in conjunction with direct smelting reduction ironmaking (Corex) to complete the smelting reduction ironmaking process. Specifically, this smelting reduction ironmaking process basically comprises two reaction devices: i) a reduction shaft and ii) a melter gasifier. Highly reducing gas is produced in the melter-gasifier through the reaction between oxygen and iron, which is subjected to filling and coal addition. In the furnace chamber, the gas containing charged particles is fed into the shaft furnace to reduce the iron mixture to iron after repeated passage through dust separation cyclones. After the dust is separated, it is sent back to the melter-gasifier through the dust recovery system. [0003...

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Problems solved by technology

[0011] At the same time, it should be noted that the existing dust recovery system also faces the problem of leakage of water from the cooling system of the disc gate valve into the furnace

Some studies have even pointed out that in this type of system, the refractory materials in the high dust box and the low dust box are loosened due to thermal shock, which also leads to blockage of the dust recovery system in several places

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