LIFE CYCLE ASSESSMENT AND TECHNO-ECONOMIC ANALYSIS OF PRODUCING AMMONIA BY ALGAL BIOMASS GASIFICATION
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摘要: 生物质气化制氨是缓解能源紧张、实现可持续发展的重要途径之一。为探究藻类生物质气化制氨过程的环保性和经济性,采用生命周期评价(life cycle assessment,LCA)和技术经济分析方法,对超临界水气化、等离子体气化制氢、化学链空气分离和深冷空气分离制氮,以及Haber-Bosch(H-B)工艺合成氨组合成的4种制氨工艺路线分别进行能源消耗、环境影响和经济性分析。结果表明:4种制氨工艺路线中,超临界水气化制氢、深冷空气分离制氮和H-B工艺合成氨组合的工艺路线环境影响最小,其总环境影响负荷值为36001.9 mPET2010(milli-person equivalent,毫人当量)。虽然等离子体气化技术需对湿微藻进行干燥预处理,但是其生产单吨液氨的成本仍低于超临界水气化技术。其中,等离子体气化制氢、化学链空气分离制氮和H-B工艺合成氨的工艺路线经济成本最低,其单吨液氨的成本为5891.67元。与传统制氨工艺相比,利用微藻气化制氨更具环保性,但仍需进一步改进设备,提高工艺的氨产量,降低制氨成本。Abstract: Producing ammonia by biomass gasification is one of the important ways to alleviate energy shortage and achieve sustainable development. In order to explore the environmental and economic performance of ammonia production by algal biomass gasification, this paper used life cycle assessment (LCA) and techno-economic analysis methods to analyze the energy consumption, environmental impacts and economic performance of four ammonia production routes, including supercritical water gasification and plasma gasification to produce hydrogen, chemical chain air separation and cryogenic air separation to produce nitrogen, and Haber-Bosch (H-B) process to produce ammonia. The results showed that in terms of the total environmental impacts, the best eco-friendly route was supercritical water gasification to produce hydrogen & deep-cooled air separation to produce nitrogen & H-B process to produce ammonia, of which the total environmental impacts potential was 36001.9 mPE. Although plasma gasification required pre-drying of the material, but the production cost of liquid ammonia per ton when adopting plasma gasification was lower than adopting supercritical water gasification. The most economic route was plasma gasification to produce hydrogen & chemical chain air separation to produce nitrogen & H-B process to produce ammonia, of which the production cost of liquid ammonia per ton was 5891.67 CNY. The process of microalgae gasification to produce ammonia was more eco-friendly than the traditional ammonia production processes, but it is still necessary to improve the equipment and technology to increase the ammonia yield and reduce the production cost.
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