Advanced Packed-Bed Ca-Cu Looping Process for the CO2 Capture From Steel Mill Off-Gases
Advanced Packed-Bed Ca-Cu Looping Process for the CO2 Capture From Steel Mill Off-Gases
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DOI：
10.3389/fenrg.2020.00146
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
J. Fernández;V. Spallina;J. C. Abanades
中科院分区：
文献类型：
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作者：
J. Fernández;V. Spallina;J. C. Abanades
提出了一种基于动态操作填料床反应器的新型Ca-Cu循环工艺，将高炉煤气转化为H2/N2和高浓度CO2，并伴有大量高温热量。该工艺的初步能量和质量平衡表明，如果在还原/煅烧阶段仅使用BFG作为还原性气体，则大约30%的BFG可以通过钙辅助水煤气转换（WGS）进行升级。使用其他炼钢厂废气，如焦炉气（COG）或碱性氧炉气（BOFG）或天然气再生CO2吸附剂，可以产生更高数量的H2/N2。这种脱碳的燃气可以用于现场发电或通过直接还原铁（DRI）工艺获得海绵铁，从而提高钢厂的整体产能。据计算，能源效率高于75%，在吸附剂再生阶段使用天然气作为燃料的情况下，达到88%左右的最大值。约1.5 MJLHV/kgCO2的低比能耗值和高于95%的CO2捕获效率支持了所提出的Ca-Cu循环工艺的进一步发展。
A novel configuration of the Ca-Cu looping process based on dynamically operated packed-bed reactors is proposed to convert blast furnace gas (BFG) into H2/N2 and highly concentrated CO2, accompanied by a large amount of high-temperature heat. Preliminary energy and mass balances of the process reveal that around 30% of the BFG can be upgraded via calcium assisted water gas shift (WGS) if only BFG is used as reducing gas in the reduction/calcination stage. A higher amount of H2/N2 can be produced by using other steel mill off gases, such as coke oven gas (COG) or basic oxygen furnace gas (BOFG), or natural gas in the regeneration of the CO2 sorbent. This decarbonized fuel gas could be used for onsite power generation or to obtain sponge iron by a Direct Reduced Iron (DRI) process, increasing the overall capacity of the steel plant. Energy efficiencies higher than 75% have been calculated, reaching maximum values around 88% in case of using natural as fuel gas for the sorbent regeneration stage. Low values for the specific energy consumption of around 1.5 MJLHV/kgCO2 and CO2 capture efficiencies higher than 95% support the further development of the proposed Ca-Cu looping process.