Mercado John Patrick, Ubando Aristotle T, Gonzaga Jeremias A, Naqvi Salman Raza
Department of Mechanical Engineering, De La Salle University, 2401 Taft Avenue, Manila, 0922, Philippines.
Department of Mechanical Engineering, De La Salle University, 2401 Taft Avenue, Manila, 0922, Philippines; Thermomechanical Analysis Laboratory, De La Salle University, Laguna Campus, LTI Spine Road, Laguna Blvd, Biñan, Laguna, 4024, Philippines; Center for Engineering and Sustainable Development Research, De La Salle University, 2401 Taft Avenue, Manila, 0922, Philippines.
Environ Res. 2023 Jan 15;217:114876. doi: 10.1016/j.envres.2022.114876. Epub 2022 Nov 23.
Chemical looping combustion (CLC) is a promising technology that generates energy while inherently separating carbon dioxide from air using oxygen carriers. This allows for an efficient and cost-effective means of carbon capture and storage. Current CLC systems use coal with metal oxides for combustion in the fuel reactor, thus, resulting in some environmental impacts. Recent life cycle assessment (LCA) of CLC studies have indicated the environmental impacts of conventional coal-based CLC, especially on the global warming potential. To mitigate these environmental impacts, this study proposes the use of a biomass-based CLC and evaluates its impacts using LCA. A case study in the Philippines is adopted where rice husks are used as biomass feedstock. A kilowatt-hour of electricity generated from the CLC plant is utilized as the functional unit. A relative comparison of environmental impacts was considered between the coal-based power plant, the coal-based CLC plant, and the biomass-based CLC plant. The single score results have shown that the biomass-based CLC has the least environmental impacts relative to the coal-based power plant and the coal-based CLC plant. However, it is noted that water consumption is the main drawback of utilizing rice husks as CLC biomass feedstock. The majority of the environmental impacts of the coal-based CLC and the coal-based power plant were derived from upstream processes such as coal mining and processing. With the use of rice husks as CLC biomass feedstock, net negative emissions were achieved.
化学链燃烧（CLC）是一项很有前景的技术，它在利用氧载体从空气中固有地分离二氧化碳的同时产生能量。这使得碳捕获和储存成为一种高效且经济高效的方式。当前的化学链燃烧系统在燃料反应堆中使用煤与金属氧化物进行燃烧，因此会产生一些环境影响。最近对化学链燃烧研究的生命周期评估（LCA）表明了传统煤基化学链燃烧的环境影响，尤其是对全球变暖潜能值的影响。为了减轻这些环境影响，本研究提出使用基于生物质的化学链燃烧，并使用生命周期评估来评估其影响。采用了菲律宾的一个案例研究，其中稻壳被用作生物质原料。以化学链燃烧发电厂产生的一千瓦时电力作为功能单位。考虑了煤基发电厂、煤基化学链燃烧发电厂和生物质基化学链燃烧发电厂之间环境影响的相对比较。单项评分结果表明，相对于煤基发电厂和煤基化学链燃烧发电厂，生物质基化学链燃烧对环境的影响最小。然而，需要注意的是，用水是将稻壳用作化学链燃烧生物质原料的主要缺点。煤基化学链燃烧和煤基发电厂的大部分环境影响来自上游过程，如煤炭开采和加工。通过使用稻壳作为化学链燃烧生物质原料，实现了净负排放。
