非焦煤炼铁工艺及装备的未来(2)——气基直接还原炼铁工艺及装备的前景研究(下)

Future of Process and Equipment on Non-coking Coal Ironmaking(2)——Prospect study on process and equipment for gas-based direct reduction ironmaking( Ⅱ)

气基直接还原工艺中以MIDREX法和HYL法为首的竖炉法占据主要地位,本文承接上篇,分析了HYL-Ⅲ与Energiron工艺的操作流程和工艺特点,并与MIDREX工艺做对比:HYL以水蒸气裂化天然气产生的75%以上氢气的还原气,带来工艺上的重大变革,可以提升反应温度、放宽原料硫含量的要求,还原气的利用率和反应速率得以大幅提高,一举多得。但其高压操作的特性,增加了投资和维护成本。HYL/Energiron运用了气动输送技术,高级自动化技术,CO2吸收技术等提升工艺的可靠性和环境友好性。

MIDREX process and HYL process occupied the main position in the DRI market. This article follows closely the previous one, and introduces the operation process and technological characteristics of HYL-Ⅲ process and Energiron process, and compares HYL-Ⅲ process with MIDREX process. The HYL process crack nature gas by steam to produce reducing gas including more than 75% H2, in a process of significant change, can promote the reduction reaction temperature, loosen the sulphur content of raw materials, and raise the utilization rate of the reducing gas and the reaction rate. However, its characteristics of high-pressure operation increase the investment and maintenance costs. The HYL/Energiron process use several new techniques the reliability of the process and environmental friendliness, such as the pneumatic conveying technology, advanced automation technology, CO2 absorption technology.