贵州高灰熔点煤气化特性研究

STUDY ON GASIFICATION CHARACTERISTICS OF GUIZHOU COAL WITH HIGH FUSION TEMPERATURE

选取贵州典型高灰熔点煤种老矿中煤,在柱塞流反应器中进行气化特性研究,在未反应碳缩核模型以及动力-扩散模型两种气化反应动力学模型的基础上,建立了相应的一维柱塞流气化小室模型.结果表明,当反应温度从1 200℃上升至1 500℃时,CO2的体积分数下降约15%,CO的体积分数上升约16%,H2的体积分数上升约2%,碳转化率上升约20%;在相同温度下,水煤浆浓度增加5%,CO的体积分数约增加3%,H2的体积分数约增加0.5%,碳转化率下降约1.5%,气化模型计算结果与实验结果吻合较好.同时建议在实际气化炉运行过程中,应提高水煤浆浓度,以保证碳转化率同时尽量提高合成气有效成分.

Study on gasification characteristics of typical coal in Guizhou Province with high ash fusion temperature is carried out during plug flow. A corresponding gasification model which is based on the shrinking core model and the dynamic-diffusion model has been built in accordartce with the boundary conditions of the experimental gasifier. The result shows that when the temperature increased form 1 200 ℃ to 1 500 ℃, the volume fraction of CO2 decreases by 15%, the volume fraction of CO increases by 16%, the volume fraction of H2 increases by 2%, the carbon conversion increases by 20% ; at the same temperature, when the concentration of coal slurry increases by 5 %, the volume fraction of CO increases by 3 %, the concentration of H2 increases by 0.5 %, the carbon conversion decreases by 1.5 %. The calculated result is corresponding to the experiment result well. It is suggested that the concentration of coal slurry should be improved as high as possible, so that there will be more effective components of syngas.