新型全混合式厨余垃圾生物干化工艺效能实证研究

Empirical study on the performance of the novel full-mixed kitchen waste biodrying

开发了一种新型连续进料全混合式厨余垃圾生物干化工艺,通过中试试验探究了该工艺运行效能及其对物料温度、含水率和热值的影响规律.结果表明,该工艺可显著缩短升温时间,维持物料>50℃的高温区段20h/d;在最佳运行条件(通风速率0.171m^(3)/(kg·h),最低控制温度45℃,干化周期7d)下,厨余垃圾含水率可降至(34.86±1.71)%,水分单位去除量达(716±23)kg水/t垃圾,运行能耗仅为77.91kW·h/t垃圾,低位热值高达(6681±119)kJ/kg,满足垃圾焚烧进炉要求,可有效实现厨余垃圾快速衍生燃料化.

The research developed a continuously full-mixed biodrying process of kitchen food waste.Impacts of the process performance on matrix’s temperature,moisture content and calorific values etc.were investigated at the pilot-scale.Results showed that it could not only significantly shorten start-up heating time,but also maintain high-temperature zone(>50℃)of the matrix temperature during the continuous operation of the biodrying for 20h/d.Under the optimal operation condition,such as ventilation volume of 0.171m^(3)/(kg·h),heating temperature of 45℃and retention time of 7d,the moisture content of kitchen food waste could be reduced to(34.86±1.71)%with a unit water removal rate of(716±23)kg water/t waste and energy consumption of 77.91kW·h/twaste.The low calorific value of its derived fuel reached up to(6681±119)kJ/kg,which fulfilled the requirement for waste incineration and could rapidly convert kitchen waste to feed for fuel.