生物质下吸式气化炉热解气化试验研究

Experimental Study of the Pyrolytic Gasification of a Biomass Downdraft Type Gasifier

以生物质下吸式气化炉为研究对象,采用水稻秸秆颗粒为原料,通过试验研究分析气化炉内温度分布变化,氧化区温度对产物燃气组分、燃气热值、产气量和产气效率的影响。结果表明:随着氧化区温度由500℃上升到800℃,H_2含量上升了12.23%,CH_4含量上升了98%,可燃气体总含量由15%上升至34%。燃气热值随温度升高呈线性规律升高,800℃时气体热值达到最大值6.76 MJ/Nm^3之后略有下降,热值的高低主要受CH_4含量高低的影响。气化炉工作稳定后,气化效率为71.64%-76.64%,对生物质颗粒这种密度大、热值高的燃料具有良好的适应性,气化性能较为理想。

With a biomass downdraft type gasifier serving as the object of study and the rice stalk particles as the raw material,through an experimental study,analyzed were changes in the temperature distribution inside the gasifier and the influence of the gasification temperature on the fuel gas constituents of the products,fuel gas heating value,gas pro-duction capacity and efficiency. It has been found that the temperature in the oxidation zone increases from 500 ℃to 800 ℃,the hydrogen content increases by 12. 23%,the CH4 content increases by 98% and the total fuel gas content increases from 15% to 34%. The heating value of the fuel gas will increase according to a linear law with an increase of the temperature. When the temperature is 800 ℃,the heating value of the fuel gas will slightly decrease after attaining its maximum value of 6. 76 MJ / Nm3. The magnitude of the heating value is mainly influenced by the magnitude of the CH4 content. After the operation of the gasifier has been stable,the gasification efficiency will be in a range from 71. 64% to 76. 64%,thus enjoying a good adaptability to the fuels having big densities and high heating values such as biomass particles and attaining relatively ideal gasification performance.