Metallic oxide high-efficiency reduction system and method

Abstract

The invention provides a metallic oxide high-efficiency reduction system and method. The metallic oxide high-efficiency reduction system comprises a combustion chamber, a heat accumulator, a reductionchamber, a flue, a material bearing breathable platform, a reducing gas purification device and first flue gas switches. The combustion chamber is arranged above the reduction chamber and communicates with the reduction chamber. The heat accumulator is arranged between the combustion chamber and the reduction chamber. The heat accumulator is of a breathable structure. The lower end of the reduction chamber communicates with the flue. The first flue gas switches are arranged between the reduction chamber and the flue. The material bearing breathable platform is arranged in the reduction chamber. The bottom of the material bearing breathable platform is provided with a breathable partition board. A suction opening pipeline of the reducing gas purification device communicates with the bottomof the material bearing breathable platform. According to the technical scheme of the metallic oxide high-efficiency reduction system and method provided by the invention, the heating step and the reduction step are separated; reducing gas is heated through the heat accumulator, so that the reducing gas reacting with a heating material also becomes high-temperature gas. Accordingly, the reducingeffect of the material is improved, and the product quality is improved.

Description

technical field [0001] The invention relates to a metal oxide high-efficiency reduction system, which belongs to the technical field of iron ore reduction. The invention also relates to a method for efficiently reducing metal oxides. Background technique [0002] Since the idea of ​​direct reduction technology was proposed at the end of the 18th century, it began to develop in the 1960s. A total of dozens of processes have been proposed so far, and there are two types of processes based on the reducing agent used: gas-based and coal-based. From the perspective of the development of direct reduction, whether it is the actual output or production capacity of direct reduction, the gas-based direct reduction method has always been dominant (about 80%), and the coal-based direct reduction method accounts for about 20%. Gas-based processes are mainly concentrated in areas rich in natural gas resources such as Iran, Saudi Arabia, Mexico and Russia. For other regions with abundan...

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Problems solved by technology

The main problems encountered in this process are: the heating of the rotary hearth furnace depends entirely on radiation heat transfer, the combustion flame and combustion exhaust gas cannot contact the material layer of carbon-containing pellets at all, the heat supply and the reduction potential guarantee become a pair of contradictions, and the product metal The conversion rate is not high (70% to 80%); the equipment is similar to the annular heating furnace, the structure is complex, and the operating cost is high; the production control requirements are high, and the production stability (product quality, equipment operation) has not reached people's expected level

my country uses coal as the main energy source, and focuses on coal-based direct reduction processes, including rotary kilns, rotary hearth furnaces and tunnel kilns, but none of them have achieved good breakthroughs and development

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