污泥热解工艺的连续式生产性研究

Production Scale Experimental Study on Sludge Pyrolysis Technology

基于现有污泥热解技术研究成果,对污泥热解工艺进行改进和扩大,开展污泥热解工艺生产规模试验研究。热解设备采用PLC自动控制电加热方式实现对热解反应温度的精确控制,采用调节绞龙转速的方式准确控制污泥在热解设备内的热解反应时间,使其能够在预定的工艺条件下热解为污泥炭和热解气。经验证可知,最优工艺条件是热解温度为900℃、热解反应时间为20 min,热解气最大流量可达819 m^3/h,主要成分为甲烷(16.31%)、氢气(28.38%)、一氧化碳(30.91%),可燃成分所占比例高,经净化后可作为燃料利用。经计算,热解气制备成本约为0.44元/kg,远低于传统燃气价格,该技术实现了污泥资源化处理与处置,综合效益可观。

Based on the existing research results of sludge pyrolysis, the pyrolysis process of sludge was improved, and production scale experiment of sludge pyrolysis process was carried out. PLC was utilized to control the electric heating in order to achieve precise control of the pyrolysis temperature, and the pyrolysis reaction time was controlled by the speed of the auger. The sludge could be pyrolyzed to the char and the pyrolysis gas under predetermined conditions. Under the optimal operation conditions, pyrolysis temperature of 900 ℃ and the pyrolysis reaction time of 20 min, the maximum flow rate of pyrolysis gas was up to 819 m^3/h, mainly composed of 16.31% methane, 28.38% hydrogen, 30.91% carbon monoxide and other gas impurity. The proportion of the combustible components was high which could be used as a fuel after purification. The preparation cost of pyrolysis gas was about 0.44 yuan/kg, cheaper than that of the traditional gas clearly. The technology realizes the sludge treatment and disposal with good comprehensive benefits.