Control device of continuous external heating reduction gas direct reduction iron comprehensive plant

Abstract

The invention discloses a control device of a continuous external heated integrated device for producing direct reduction iron through reduction gas. The control device comprises an industrial control center, as well as a bucket elevator, a belt conveyor, a feeding valve, a spiral discharging device, a combustion chamber thermometer, a rotary reversing motor, an air boaster, a gas boaster, an exhaust gas fan and a spray water pump which are connected with the industrial control center respectively and are controlled by the industrial control center to work. The control device integrates the electric appliances for the process of preheating, reduction, heating and cooling of direct reduction iron, and tail gas purification together for control, so that the process is controlled independently, the integral system process is coordinated, and automatic and continuous reduction production of large scale direct reduction iron.

Description

technical field [0001] The invention relates to the control technology of gas-based reduction iron, in particular to the control device of the continuous external heat reduction gas direct reduction iron comprehensive device. Background technique [0002] At present, the production of direct reduced iron (DRI) mainly includes coal-based method and gas-based method according to the use of different reducing agents. The gas-based method mainly uses natural gas or coal to produce reducing gas or replaces natural gas with coke oven gas (COG), converter gas and (or) blast furnace (BF) top gas as the reducing agent and heat source, and the coal-based method uses coal as the reducing agent agents and heat sources. There are many kinds of coal-based methods, but the low production efficiency, high investment and heavy pollution make the gas-based method the mainstream of direct reduction ironmaking. [0003] The traditional gas-based method takes the direct reduction process of th...

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Problems solved by technology

There are many kinds of coal-based methods, but the low production efficiency, high investment and heavy pollution make the gas-based method become the mainstream of direct reduction ironmaking

[0003]The traditional gas-based method takes the shaft furnace direct reduction process as the technical trend. With the development of the gas-based shaft furnace direct reduction technology, there are now many technical introductions in the literature. For example, the patent document CN102304599A introduces a method and device for producing direct reduced iron in a gas-based reduction shaft furnace. This document mainly separates H2 and Linde gas from the coke oven gas, and then mixes H2 with coal gas and heats it to form reduced iron. Gas, Linde gas is used as cooling gas. The disadvantage of this technology is that the heating of H2 mixed with coal gas needs to consume heat energy, and the production cost will increase; in addition, the patent literature on gas-based method, such as CN1896286B, introduces a self-produced iron ore coal pellet The method of producing direct reduction iron with reducing gas, using heated reducing gas to pass into the reduction shaft furnace, heating new iron ore coal pellets, generating new pyrolysis gas H2, CO and furnace top gas CO2, H2O, forming endogenous reduction Gas circulation production and use, the disadvantage of this technology is that the new pyrolysis gas H2, CO is actually easy to burn in the furnace body to generate CO2, H2O, and the H2 and CO obtained are very small, so it is difficult to achieve continuous, efficient, and large-scale reduction iron production

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