污水污泥热解过程的能量平衡与反应热分析

依据能量守恒定律,通过分析污水污泥热解过程的能量利用、耗散和回收情况,提出了污泥热解制取三相产物处理系统的能量平衡模型,分析计算了污泥热解反应热,并利用回收率和耗能比对热解处理系统的耗能状况进行了评价.结果表明:能量利用过程中总存在能源的耗散,减少能耗的主要方式是尽可能提高产物的能值、降低热消耗和废弃的能量;在不同的热解工况下,热量损失的差别明显,热解停留时间长、升温速率慢、热解温度高均会导致输入能量和热损失增大;能耗评价也验证了热解技术能够回收更多的能量,可以获得更大的能耗比.

Analysis on Energy Balance and Reaction Heat of Sewage Sludge Pyrolysis Process

Based on analysis of energy utilization,consumption and recovery in the process of sewage sludge pyrolysis according to the law of energy conservation,an energy balance model was proposed for the process of producing three-phase products from sewage sludge pyrolysis,with which the reaction heat of sewage sludge pyrolysis was calculated,while the energy balance of different pyrolysis processes evaluated by considering both the energy recovery and energy consumption rate.Results show that energy loss is unavoidable during utilization;the way to save energy is to raise the heat value of pyrolysis products and simultaneously reduce heat loss and abandoned energy;different pyrolysis conditions result in different heat loss;long retention time,low heating rate,and high pyrolysis temperature will lead to increased input energy and heat loss.Energy consumption evaluation proves the pyrolysis technology to be effective in recovering more energy and raising energy consumption rate.