An option considered for reducing carbon emissions in the iron/steel industry is the use of Top-gas recycle blast furnace (TGR-BF), which captures CO₂ from the blast furnace gas (BFG) and recycles the remaining CO and H₂ back to the blast furnace (BF). This study suggests four different designs of CO₂ capture processes suitable for the TGR-BF application: Amine scrubbing, membrane separation, and a hybrid between the amine scrubbing and the membrane separation with and without heat recovery. In particular, the hybrid-with-heat-recovery design recovers the combustion heat of the impurities (e.g., CO and H₂) in the captured CO₂ stream. The four alternative processes are simulated and evaluated on the basis of multiple criteria including operating cost, capital cost, rate of CO₂ avoided, and CO₂ avoidance cost with various electricity sources. Furthermore, sensitivity analysis is performed by perturbing the utility prices. Among the four alternatives, the hybrid-with-heat-recovery design is shown to give the best performance with the avoidance cost of $30.4/ton_CO2, outperforming the mature technologies.

在钢铁工业中考虑减少碳排放的一种选择是使用顶部气体再循环高炉（TGR-BF），该气体从高炉气体（BFG）中捕集CO ₂并将剩余的CO和H ₂再循环回去到高炉（BF）。这项研究提出了适用于TGR-BF应用的四种不同的CO ₂捕集工艺设计：胺洗涤，膜分离以及胺洗涤和膜分离（有无热回收）之间的混合。特别地，热回收混合设计可回收捕获的CO _2中杂质（例如，CO和H ₂）的燃烧热。溪流。在多种标准的基础上模拟和评估了这四个替代过程，包括运营成本，资本成本，避免的CO ₂比率以及使用各种电源的避免CO _2的成本。此外，通过扰动公用事业价格来进行敏感性分析。在这四种备选方案中，混合动力与热回收所示的设计给30.4 $ /吨避免成本的最佳性能_CO2，跑赢成熟的技术。