Yaqub Zainab T, Oboirien Bilainu O
Department of Chemical Engineering Technology, University of Johannesburg, Auckland Park 2006, South Africa.
ACS Omega. 2020 Aug 24;5(35):22420-22429. doi: 10.1021/acsomega.0c02880. eCollection 2020 Sep 8.
Chemical looping combustion (CLC) is a novel carbon capture and storage technology that can be used in the proper disposal of municipal solid waste when used as a solid fuel. In this study, the results of the CLC of paper, plastics, and paper/plastic blends were compared with CLC of South African coal using Chemcad software. The simulation was done for two different CLC processes, namely, chemical looping oxygen uncoupling (CLOU) and in situ gasification CLC (IG-CLC). The results demonstrated that coal at 66% had a lower CO yield than paper (86%) but a higher yield than all the plastic samples in CLOU (3356%) and an equal CO yield in paper and all plastic samples in IG-CLC. Furthermore, coal had a lower CO gas yield than all the optimum blends (72-85%) for CLOU and an equal yield with the entire paper/plastic blend in IG-CLC. On combustion efficiency, coal has a lower combustion efficiency at 80% than paper and polyvinyl chloride (PVC) at 90 and 96%, respectively, but a higher efficiency than other plastic samples that are between 30 and 70% in CLOU while in IG-CLC, it had a lower efficiency than paper, PVC, and polyethylene terephthalate and higher efficiency than high-density polyethylene, low-density polyethylene, polypropylene, and polystyrene. For paper/plastic blends, coal has higher combustion efficiency than all the paper/plastic blends in both CLOU and IG-CLC processes except for the paper/PVC where the combustion efficiency was higher than coal.
化学链燃烧（CLC）是一种新型的碳捕获与封存技术，当用作固体燃料时，可用于城市固体废物的妥善处置。在本研究中，使用Chemcad软件将纸张、塑料以及纸/塑混合物的化学链燃烧结果与南非煤的化学链燃烧结果进行了比较。针对两种不同的化学链燃烧过程进行了模拟，即化学链氧解耦（CLOU）和原位气化化学链燃烧（IG-CLC）。结果表明，在CLOU中，66%的煤的CO产率低于纸张（86%），但高于所有塑料样品（33 - 56%），在IG-CLC中，纸张和所有塑料样品的CO产率相等。此外，在CLOU中，煤的CO气体产率低于所有最佳混合物（72 - 85%），在IG-CLC中，煤与整个纸/塑混合物的产率相等。关于燃烧效率，煤在80%时的燃烧效率低于纸张和聚氯乙烯（PVC），纸张和PVC的燃烧效率分别为90%和96%，但在CLOU中，煤的燃烧效率高于其他燃烧效率在30%至70%之间的塑料样品，而在IG-CLC中，煤的燃烧效率低于纸张、PVC和聚对苯二甲酸乙二酯，高于高密度聚乙烯、低密度聚乙烯、聚丙烯和聚苯乙烯。对于纸/塑混合物，在CLOU和IG-CLC过程中，除了纸/PVC混合物的燃烧效率高于煤外，煤的燃烧效率高于所有纸/塑混合物。
