摘要
文章建立了生物质热解挥发物冷凝特性参数测试系统,开展了木屑在热解温度分别为400,500,600℃下的热解挥发物冷凝特性研究。结果表明,在同一热解温度下表面换热系数均随x轴向距离的增加而减小,在入口段中,400℃生物质挥发物的表面换热系数高于500℃和600℃的实验值。对实验值进行模型拟合,Nusselt模型和f因子模型均不适用于木屑不同热解温度挥发物的冷凝特性的模拟。通过指数衰减曲线方程对实验值进行拟合,得出的方程能够较好模拟木屑热解挥发物冷凝特性,可为连续热解装备中生物油冷凝器的设计提供参考。
A condensation characteristics testing system of biomass pyrolysis volatiles was built. Pyrolysis volatiles of sawdust produced in 400 ℃,500 ℃ and 600 ℃ were tested in this system. As a result, surface heat transfer coefficients decrease with the increase of x axial distance in a same pyrolysis temperature. Surface heat transfer coefficients of volatiles in 400 ℃ are higher than the values of 500 ℃ and 600℃in 0.08-0.38 m. When using Nusselt theoretical model and f-factor model to simulate experimental datum, the results showed that both models are not suitable for the simulation. Exponential decay equations are built to fit experimental datum with better simulated effect. The equations could bring a reference for bio-oil condenser design of continuous pyrolysis apparatus.
出处
《可再生能源》
CAS
北大核心
2015年第11期1712-1716,共5页
Renewable Energy Resources
基金
科技部农业科技成果转化资金项目(2014GB2E000048)
土壤植物机器系统技术国家重点实验室开放课题(2014-SKL-07)
关键词
木屑热解
冷凝特性
换热系数
模型拟合
sawdust pyrolysis
condensation characteristics
heat transfer coefficient
model fitting
