热解温度对低阶煤热解性能影响研究

为获得高品质高产率热解油气,以榆林长焰煤为研究对象,采用1 kg/h外热式回转炉,研究不同热解温度下榆林长焰煤的产品产率、半焦强度及煤焦油品质。结果表明:随着热解温度的升高,榆林煤裂解程度加深,有机质剧烈分解,气体、液体产物不断析出,半焦产率下降,煤气产率增加;热解水量受温度影响不大,仅随温度升高略有增加。随热解温度升高,榆林煤热解半焦结构强度和半焦微孔均增大,温度越高,气孔结构越发达。煤焦油中脂肪族和芳香族含量与热解温度成正比,极性物含量与热解温度成反比。长焰煤适宜热解温度为600℃,此时煤焦油产率达到极大值8.66%,为格金焦油产率的79.5%;半焦结构强度在78%以上,煤焦油中脂肪族和芳香族含量在50%以上,极性物含量32.9%,族组成较为理想。

Influence of temperature on pyrolysis properties of low rank coal

In order to get high quality and yield coal tar,taking Yulin long flame coal as research object,the paper investigated the products yield,char strength and coal tar properties under different prolysis temperature using 1 kg/ h external heated rotary furnace.The results showed that,the rising temperature aggravated the pyrolysis,the gas and liquid products yield increased,the char yield decreased.With the rise of temperature,the yield of water yield increased slightly,the char structural strength and aperture also raised.The higher the tempera-ture,the better-developed pore structure.The aliphatic and aromatic content were proportional to the temperature,while the polar composi-tion was inversely proportional to the temperature.The optimum prolysis temperature was 600 ℃ for long flame coal,the maximum coal tar yield was 8.66%,which was 79.5% of Gray-King yield.The semi-coke strength was greater than 78% when the polar composition was 32. 9% and the aliphatic and aromatic content was more than 50%.