Kunming University of Science and Technology, 68 Wenchang Road, 121 Blvd., Kunming, Yunnan 650093, China.
University of Minnesota, 1390 Eckles Ave, St. Paul, MN 55108, USA.
Bioresour Technol. 2018 May;256:295-301. doi: 10.1016/j.biortech.2018.02.034. Epub 2018 Feb 8.
A continuous fast microwave-assisted pyrolysis system was designed, fabricated, and tested with sewage sludge. The system is equipped with continuous biomass feeding, mixing of biomass and microwave absorbent, and separated catalyst upgrading. The effect of the sludge pyrolysis temperature (450, 500, 550, and 600 °C) on the products yield, distribution and potentially energy recovery were investigated. The physical, chemical, and energetic properties of the raw sewage sludge and bio-oil, char and gas products obtained were analyzed using elemental analyzer, GC-MS, Micro-GC, SEM and ICP-OES. While the maximum bio-oil yield of 41.39 wt% was obtained at pyrolysis temperature of 550 °C, the optimal pyrolysis temperature for maximum overall energy recovery was 500 °C. The absence of carrier gas in the process may be responsible for the high HHV of gas products. This work could provide technical support for microwave-assisted system scale-up and sewage sludge utilization.
设计、制造并测试了一种连续快速微波辅助热解系统，以处理污水污泥。该系统配备了连续的生物质进料、生物质和微波吸收剂的混合以及分离催化剂升级功能。研究了污泥热解温度（450、500、550 和 600°C）对产物产率、分布和潜在能量回收的影响。采用元素分析仪、GC-MS、Micro-GC、SEM 和 ICP-OES 对原始污水污泥以及在该温度下获得的生物油、焦和气体产物的物理、化学和能量特性进行了分析。在 550°C 的热解温度下获得了 41.39wt%的最大生物油产率，而获得最大总能量回收的最佳热解温度为 500°C。该过程中没有载气的存在可能是导致气体产物高热值（HHV）的原因。这项工作可为微波辅助系统的放大和污水污泥的利用提供技术支持。
