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Theoretical Evaluation on Merits of the Processes of Gas-Based Shaft Furnace with Top Gas Recycling

机译：炉顶煤气循环气基竖炉工艺优点的理论评价

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摘要

To achieve the solution to inadequate utilization of chemical potential of the reducing gas in gas-based shaft furnace, the different innovative processes with top gas recycling and oxygen blowing are established and the energy efficiency and CO2 emission of each process are numerically analyzed through a validated process model based on the conservations of mass and heat. The results show that in the proposed TGR1, TGR2, and TGR3 cases, the demand of the fresh hot reducing gas decreases by 63.77, 57.13, and 55.85%, respectively, meanwhile the requirement of the corresponding sensible heat shows the same tendency. However, the consumption of energy in each process increases by 14.04, 17.17, and 24.65%, respectively, because of the additional cost of the gas reforming and preheating. The emission of CO2 for TGR1 decreases by 15.35% while the one for TGR2 and TGR3 increases by 0.16 and 3.15%, respectively. Therefore, the proposed top gas recycling technology for the gas-based shaft furnace process cannot lower the consumption of energy from the whole process view. In the case with oxygen blowing of 4.49Nm(3) tDRI(-1), the gas consumption decreases by 8.54% and the reduction potential of top gas decreases by 13.74%. Additionally, oxygen blowing process can essentially reduce both the CO2 emission and energy consumption.
机译：为解决气基竖炉中还原气化学势利用率不充分的问题，建立了采用顶气再循环和吹氧的不同创新工艺，并通过验证对每个工艺的能效和CO2排放进行了数值分析。基于质量和热量守恒的过程模型。结果表明，在建议的TGR1，TGR2和TGR3情况下，新鲜热还原气的需求量分别减少了63.77％，57.13％和55.85％，而相应的显热需求量却呈现出相同的趋势。但是，由于气体重整和预热的额外成本，每个过程中的能源消耗分别增加了14.04、17.17和24.65％。 TGR1的二氧化碳排放量减少了15.35％，而TGR2和TGR3的二氧化碳排放量分别增加了0.16和3.15％。因此，从整个工艺角度来看，为气基竖炉工艺提出的顶级气体再循环技术不能降低能耗。在吹氧为4.49Nm（3）tDRI（-1）的情况下，气体消耗量减少了8.54％，顶部气体的还原电位减少了13.74％。另外，吹氧过程可以实质上减少CO2排放和能耗。

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