高炉喷吹不同富氢介质节能减排潜能的分析与比较

doi:10.13228/j.boyuan.issn0449-749x.20230312

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Abstract At present, China′s iron and steel enterprises are still based on the long process process of blast furnace-converter, and the Hydrogen enrichment operation of blast furnace is one of the important directions in the development of hydrogen metallurgy in China. There are many kinds of hydrogen rich medium and injection mode, so it is very important to select the hydrogen rich process of blast furnace reasonably and effectively. In order to determine the appropriate hydrogen enrichment process, the concept of "carbon consumption-carbon emission-coke ratio-raceway adiabatic flame temperature operating window" is proposed based on the Rist operating line tool with hydrogen and combined with the calculation of the overall and regional heat balance of blast furnaces. The energy saving and emission reduction effects of blast furnace injection of coke oven gas, natural gas and hydrogen at normal temperature and preheating conditions are compared and analyzed. The results show that coke ratio,raceway adiabatic flame temperature, carbon consumption and CO₂emission all increase with the increase of hydrogen rich medium injection, but the effect of oxygen enrichment rate on these indexes is opposite. In the case of blast furnace without coal injection, the hydrogen rich medium injection technology can reduce carbon consumption and carbon emission, but the coke ratio is still high. By comparing the operation window area size of different hydrogen-rich processes, it is concluded that blast furnace coal powder injection(PCI) + pure hydrogen in blast furnace has higher energy saving and emission reduction. The maximum injection volume and limiting link of different hydrogen-rich technology can be intuitively obtained from the operation window. The results show that the maximum injection amounts of BF PCI + natural gas, BF PCI + coke oven gas and BF PCI + H₂are 128, 359 and 500 m³/t respectively, and the energy saving and emission reduction rate of blast furnace coal injection + 950 ℃ preheating hydrogen is increased by about 20% compared with normal temperature conditions.

Key words： hydrogen-rich medium blast furnace injection restrictive link energy conservation and emission reduction operating window

Received: 09 June 2023

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