玉米芯流化床快速热解制取生物油试验研究

EXPERIMENTAL RESEARCH ON CORNCOB FAST PYROLYSIS FOR BIO-OIL IN A FLUIDIZED BED REACTOR

本文在流化床上对玉米芯进行了快速热解制取生物油的试验研究。首先在非催化条件下考察了温度、气体流量、床高和物料粒径对热解产物产率的影响,得到了制取生物油的最优工况。在此工况下进行了催化热解试验,研究了FCC催化剂对热解产物产率和生物油品质的影响。结果表明,最优工况下生物油产率为56.8%。同未加催化剂相比,FCC催化剂的存在使得生物油中油组分和焦炭的产率降低,不凝结气体、水分和焦的产率增加。分级冷凝系统的应用较好的实现了重油、轻油和水的分离。对催化条件下第二级冷凝器收集的生物油分析表明,其油组分的氧含量和高位热值分别为13.64%和36.7 MJ/kg,具有很好的应用前景。

Corncob fast pyrolysis experiments for bio-oils are carried out in a fluidized bed reactor. The effects of temperature, gas flow rate, static bed height and particle size on pyrolysis product yields are studied and the optimal conditions for bio-oil yield are obtained. Catalytic fast pyrolysis experiments with FCC catalyst are conducted in the optimal conditions. The effects of the catalyst on pyrolysis product yields and the qualities of the liquid products are investigated. The results show that the bio-oil yield of 56.8% is obtained in the optimal pyrolysis conditions. The presence of the catalyst decreases the yields of char and the oil fraction of bio-oil and increased the yields of non-condensable gas, water and coke when compared with the non-catalytic tests. The application of the multi-stage condensation realized a good separation of the heavy oil, light oil and water. The oxygen content and higher heating value of the oil fraction of the bio-oil in the second condenser are 13.64% and 36.7 MJ/kg. It is indicated that the oil fraction had high qualities and promising application prospects.