Microwave vacuum pyrolysis of waste plastic and used cooking oil for simultaneous waste reduction and sustainable energy conversion: Recovery of cleaner liquid fuel and techno-economic analysis
Microwave vacuum pyrolysis of waste plastic and used cooking oil for simultaneous waste reduction and sustainable energy conversion: Recovery of cleaner liquid fuel and techno-economic analysis
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DOI：
10.1016/j.rser.2019.109359
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发表时间：
2019-11-01
影响因子：
15.9
通讯作者：
Tsang, Daniel C. W.
中科院分区：
文献类型：
--
作者：
Lam, Su Shiung;Wan Mahari, Wan Adibah;Tsang, Daniel C. W.
考察了微波真空热解与常规热解在废塑料和废食用油同时协同加工生产燃料产品方面的技术经济可行性，并进行了比较。该热解具有加热速度快（29℃/min）、裂解温度高（581℃）、时间短（20 min）、电能消耗低（0.38 kWh）等优点。微波真空热解与活性炭反应床相结合可制得84 wt%的液态油，含轻烃，热值（49 MJ/kg）高于柴油和汽油，因此作为燃料具有广阔的应用前景。活性炭反应床的使用在创造还原环境，防止氧化或氧化副产物的形成方面显示出有益的效果。废塑料与废食用油之间还存在正协同效应。通过这种热解方法获得的液态油具有低氧和低氮含量，不含硫，在燃烧过程中减少焦渣、形成污泥、腐蚀性、油质降解以及排放不需要的SOx和NOx等方面表现出“更清洁”的特性。技术经济分析表明，该热解方式生产成本低（0.25美元/升，而马来西亚的柴油价格为0.523美元/升）。我们的研究结果表明，微波真空热解在经济上是可行的，并且有望作为一种可持续的能量转换方法，提供改进的工艺特征和生产更清洁的液体燃料。
Microwave vacuum pyrolysis was examined and compared to conventional pyrolysis for its technical and economic feasibility in co-processing of waste plastic and used cooking oil simultaneously to generate fuel product. The pyrolysis demonstrated beneficial process features with respect to high heating rate (29 degrees C/min) to provide fast heating, high process temperature for extensive cracking (581 degrees C), short process time (20 min), and low electrical energy consumption (0.38 kWh). The combined use of microwave vacuum pyrolysis and activated carbon reaction bed produced up to 84 wt% yield of liquid oil, containing light hydrocarbons and higher heating value (49 MJ/kg) than diesel and gasoline, hence showing great promise for application as fuel. The use of activated carbon reaction bed showed beneficial effect in creating a reduction environment that prevented the oxidation or formation of oxygenated by-products. A positive synergistic effect between waste plastic and used cooking oil was also observed. The liquid oil obtained from this pyrolysis approach presented a low oxygen and nitrogen content, and free of sulphur, showing 'cleaner' properties with respect to reduced char residues, sludge formation, corrosiveness, degradation of oil quality, and emission of undesired SOx and NOx during its utilization in combustion process. The techno-economic analysis indicated that this pyrolysis approach showed low production cost (USD 0.25/L compared to USD 0.523/L of diesel price in Malaysia). Our results demonstrate that microwave vacuum pyrolysis is potentially economically feasible and show promise as a sustainable approach for energy conversion in providing improved process features and production of cleaner liquid fuel.