Purifying technique for roof gas of COREX melting reducing furnace

Abstract

The present invention belongs to the operation technical field, discloses an ironmaking furnace coal gas purification technology and especially relates to a technology of purifying the furnace top coal gas of a COREX smelting reduction furnace. The present invention aims at that the furnace top coal gas containing dust which is produced by the COREX smelting reduction furnace during the process of ironmaking is processed for removing partial dust by a primary dust remover; dry dust removing and purifying technology is used to purify coal gas; the coal gas after purification is processed for energy recovery by a TRT device or pressure reduction by a by-pass valve set and is put into a low pressure clean coal gas pipe net through a coal gas cooler for other users to use. The present invention reduces the use of cyclic water at the maximum, reduces the energy consumption and the production cost for reducing and ironmaking and at the same time keeps the quite high temperature of reducing and ironmaking coal gas, which is in favor of matching with the TRT to use the residual heat of coal gas to increase electricity generation and furthermore to improve the economic benefit.

Description

technical field [0001] The invention belongs to the technical field of operation and discloses a process for purifying ironmaking furnace gas, in particular to a process for purifying furnace top gas of a COREX smelting reduction furnace. technical background [0002] The new COREX smelting reduction process avoids the coking and sintering process of the blast furnace process and greatly reduces environmental pollution. The COREX smelting reduction ironmaking technology has been successfully applied to industrial production and is one of the cutting-edge technologies in contemporary steel production. During the production process of COREX smelting reduction furnace, a large amount of coal gas is output from the top of the furnace. The gas purification process directly affects the economic benefits of COREX smelting reduction ironmaking production, and is the key to whether COREX smelting reduction ironmaking technology can be widely popularized and applied. So far, the top g...

AI Technical Summary

Problems solved by technology

So far, the top gas purification system of COREX smelting reduction furnace at home and abroad has adopted a wet dust removal system, and the circulating water consumption is quite large, resulting in a large circulating water treatment system and high power consumption

This is one of the reasons why the energy consumption per ton of iron in COREX smelting reduction furnace ironmaking is higher than that of conventional blast furnaces, which seriously restricts the development and application of COREX smelting reduction ironmaking technology

In addition, wet dedusting leads to a sharp drop in the top gas temperature, and a large amount of gas sensible heat is wasted, which greatly reduces the power generation capacity of the gas residual pressure turbine power generation unit (TRT), which is not conducive to energy saving and consumption reduction

Images