生物质气化燃气低位热值影响因素的试验研究

Experimental Study of the Factors Influencing the Low Heating Value of a Biomass Gasified Fuel Gas

针对生物质气化燃气的低位热值受气化温度、蒸汽与生物质质量配比(简称质量配比)及当量比等多种因素影响,且这些因素又相互作用的实际情况,采用正交设计的试验方法研究上述3个主控因素对生物质气化燃气低位热值影响的敏感程度,再用极差分析和方差分析方法对试验结果进行分析,得到影响燃气低位热值的显著性关系以及因素组合的最佳水平。试验结果表明:在试验条件范围内,各因素及其交互作用对热值影响的主次顺序为:当量比>气化温度>质量配比>质量配比与当量比的交互作用>气化温度与质量配比的交互作用>气化温度与当量比的交互作用,其中当量比、气化温度、质量配比对燃气低位热值的影响特别显著。交互作用分析获得生物质气化制取燃气的优化方案:气化温度750℃,质量配比0.75,当量比0.25,在该条件下燃气的低位热值最高(6.530 MJ/m3)。

In the light of the fact that the low heating value of a biomass gasified fuel gas is influenced by multiple factors,such as gasification temperature,steam / biomass mass ratio( referred to as mass ratio for short) and equivalent ratio etc. and these factors are interacted,the orthogonally designed test method was used to study the sensitivity extent of the three dominant factors influencing the low heating value of the biomass gasified fuel gas and the test results were analyzed by using the range and variance analytic method to obtain the significance relationship influencing the lower heating value of the fuel gas and the optimum factor combination level. The test results show that in the range of the test conditions,the priority order of various factors and their interaction influencing the lower heating value is as follows: equivalent ratio > gasification temperature > mass ratio > interaction of the mass ratio and equivalent ratio > interaction of the gasification temperature and equivalent ratio,among them,equivalent ratio,gasification temperature and mass ratio have a particularly remarkable influence on the lower heating value of the fuel gas. The version optimized for preparing the fuel gas from the gasification of biomass through an analysis of the interaction is given as follows: gasification temperature 750 ℃,mass ratio 0. 75 and equivalent ratio 0. 25. Under such conditions,the lower heating value of the fuel gas will be the highest( 6. 530 MJ / m3).