Techno-economic assessment of blast furnace gas pre-combustion decarbonisation integrated with the power generation
Techno-economic assessment of blast furnace gas pre-combustion decarbonisation integrated with the power generation
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DOI：
10.1016/j.enconman.2022.115252
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发表时间：
2022-03
影响因子：
10.4
通讯作者：
Navid Khallaghi;S Z Abbas;G. Manzolini;E. De Coninck;V. Spallina
中科院分区：
文献类型：
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作者：
Navid Khallaghi;S Z Abbas;G. Manzolini;E. De Coninck;V. Spallina
针对钢铁工业利用高炉煤气（BFG）进行脱碳的问题，研究了用甲基二乙醇胺（MDEA）进行燃烧前碳捕集的技术经济可行性。水煤气变换（WGS）的捕集性能的实施的有效性进行了调查。从技术和经济角度考虑了发电厂与来自捕集装置的脱碳燃料的整合。白杨Plus®用于开发该工艺。技术经济分析结果表明，采用WGS后，CO2捕集效率从46.5%提高到83.8%，捕集成本从39.8欧元/t CO 2提高到44.3欧元/t CO 2。结合WGS的性能，对1）不同高炉煤气成分和2）不同碳捕集率（CCR）对捕集单元的影响进行了敏感性分析。结果表明，低热值高炉煤气从技术经济的角度来看不太实用，因为它使避免CO2捕集的一次比能耗从3.3 MJ LHV/kg C O2增加到3.8 MJ LHV/kg C O2。此外，较低的CCR使来自捕集单元的富H2气体的热能从266.8MW增加到269.6MW。从环境的观点来看，这种方案的技术经济优势并不明显，因为在较低的CCR下，CO2比排放量从51 kgCO 2/GJ LHV增加到70 kgCO 2/GJ LHV。完全集成的发电厂的捕获单元显示，37.52%（无WGS）和24.27%（与WGS）的效率是通过联合循环集成实现的。对于联合循环，WGS反应器的集成将使CO2比排放量从无WGS时的1391.5kgCO2/MWh降低到675.1kgCO2/MWh。
Aiming at the iron and steel industry decarbonisation with blast furnace gas (BFG) utilisation, a techno-economic feasibility of the pre-combustion carbon capture with methyl diethanolamine (MDEA) is evaluated herein. The effectiveness of water gas shift (WGS) implementation on the capture performance is also investigated. The integration of a power plant with decarbonised fuel from the capture unit is taken into account from both technical and economic perspectives. Aspen Plus® is used to develop the process. The results obtained from the techno-economic analysis showed that the WGS implementation increases the capture efficiency from 46.5% to 83.8%, with increased CO 2 capture cost from€ 39.8/t C O 2 to€ 44.3/t C O 2. The sensitivity analysis on the effect of 1) different BFG composition and 2) different carbon capture rate (CCR) on the capture unit integrated with WGS performance is performed. The obtained results revealed that BFG with a lower calorific value is less practical from a techno-economic point of view as it increases the specific primary energy consumption for CO 2 capture avoidance (S P E C C A) from 3.3 MJ LHV/kg C O 2 to 3.8 MJ LHV/kg C O 2. Moreover, the lower CCR increases the thermal energy of the H 2-rich gas from the capture unit from 266.8 MW to 269.6 MW. The techno-economic advantages of the based case do not results beneficial for na environment point of view since at lower CCR the specific CO 2 emissions increase from 51 kg C O 2/GJ LHV to 70 kg C O 2/GJ LHV. The fully integrated power plant to the capture unit reveals that the 37.52%(without WGS) and 24.27%(with WGS) efficiencies are achievable through the combined cycle integration. For the combined cycle, the integration of WGS reactor will reduce the CO 2 specific emission to 675.1 kg C O 2/M W h in comparison to 1391.5 kg C O 2/M W h for the case with no WGS.