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提出一种大量喷吹煤粉,并保持高置换比的高炉炼铁新工艺。其特点是风口用高浓度富氧鼓风促进大量煤粉燃烧,而炉顶煤气回收脱除CO_2后再循环喷入炉身,保证高炉间接还原。对新工艺的三个技术关键:煤粉燃烧、炉身间接还原及煤气净化技术进行了实验室研究及数学模拟试验,论证了新工艺在我国条件下技术上的可行性和经济上的合理性。结论为新工艺在燃料消耗、焦比、生产率及操作费用各方面均优于常规高炉。
Proposed a large number of pulverized coal injection, and maintain a high replacement ratio of blast furnace ironmaking new technology. The utility model is characterized in that the tuyere can promote the combustion of a large amount of pulverized coal with the high-concentration oxygen-enriched air blast, and the top gas recovery removes the CO_2 and then is injected into the shaft body to ensure indirect reduction in the blast furnace. The three key technologies of the new process are pulverized coal combustion, indirect reduction of furnace body and gas purification technology. The laboratory research and mathematical simulation test are carried out to demonstrate the technical feasibility and economic rationality of the new technology in our country . The conclusion is that the new process is superior to the conventional blast furnace in all aspects of fuel consumption, coke ratio, productivity and operating costs.