A process for directly reducing pellets with methanol

Abstract

The invention discloses a technique for directly reducing pellet ore by means of methanol. The technique for directly reducing the pellet ore by means of the methanol comprises the steps that the impedance change in the reduction process is tested by means of an in-situ impedance detecting system, and heating evaporation is conducted on methanol liquid; then methanol gas is mixed with hydrogen and nitrogen, and the gas mixture is introduced into an atmosphere reaction furnace at the temperature of 750-900 DEG C; the methanol is decomposed into reductive active gas at the high temperature, and the reduction reaction of the pellet ore is conducted through the reductive active gas, the hydrogen and the nitrogen jointly; and then wires connected to the two ends of a pellet are connected with an electrochemical detection device, and the impedance change of the pellet is monitored in real time after the gas mixture is introduced. According to the technique, the in-situ impedance detecting system is utilized and can be well coupled with an electrochemical testing system, and thus safety and reliability are achieved; the hydrogen produced by a hydrogen generator is used as a hydrogen source, so that environmental friendliness is achieved, and efficient utilization of energy resources can be achieved. In addition, the methanol is used for replacing part of the hydrogen, so that the cost is reduced, operation is easy, the technique is simple, the gas utilization rate is high, and the practical value in industrial production is quite high.

Description

technical field [0001] The invention relates to a methanol reduction process for iron ore pellets, in particular to a process for reducing pellets with a mixture of methanol and hydrogen. Background technique [0002] In recent years, with the rapid development of the iron and steel industry, the total energy consumption of the iron and steel industry, the emission of greenhouse gases and various pollutants, and the increasing scarcity of iron ore and coke resources have attracted more and more attention from all walks of life. In the process of economic development, promoting the development of new theories, new methods, new technologies, new processes, new materials and new equipment for energy conservation and emission reduction has become the general trend and inevitable choice of the steel industry. As a non-blast furnace ironmaking process, the direct reduction process of pellets is an important process in modern ironmaking technology. The gas-based direct reduction i...

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Problems solved by technology

[0007] One of the purposes of the present invention is to provide a direct reduction process for reducing pellets with hydrogen, using part of methanol instead of hydrogen to achieve low-carbon reduction, so as to solve the shortcomings of the existing pellet direct reduction process, which can not only reduce costs, It has good economy; the second purpose is to use in-situ electrochemical impedance detection in the reduction process, which can not only combine electrochemistry with non-blast furnace ironmaking, but also reflect the change of pellet impedance in time. The operation process is simple and the practical value is great.

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