School of Chemical and Environmental Engineering, China University of Mining and Technology ( Beiing) Shanxi
Provincial Guoxin Energy Development Group Co.，Ltd. ENN Coal Gasification Mining Co. , Ltd.

为对煤层气化过程中生成的典型污染物多环芳烃(PAHs)进行有效控制,采用模拟固定床气化炉研究了内蒙古乌兰察布褐煤在煤焦-水蒸气气化条件下PAHs的生成及分布规律。结果表明,煤焦-水蒸气气化低温煤气中的PAHs以3环芳烃为主,含量最高的为苊和二氢苊。气化温度由900℃上升至1 000℃,PAHs生成总量由73.19 mg/kg降至9.40 mg/kg,降幅达90%;进一步升高温度至1 100℃,PAHs生成总量有所上升。水蒸气流量由0.17 mol/min增至0.61 mol/min,PAHs的生成总量整体呈现先升高后降低的趋势。水蒸气流量为0.39 mol/min时,PAHs生成量最大,为73.19mg/kg,为最小生成量的1.5倍。维持气化温度在1 000~1 100℃,可有效降低PAHs的生成。增加水蒸气用量,低温煤气中的PAHs含量降低,此时须加强对煤气冷凝水中PAHs的处理。

In order to control effectively typical pollutants polycyclic aromatic hydrocarbons ( PAHs) generated in underground coal gasification ( UCG) process, the experiment was carried out to study the generation and distribution laws of PAHs in the process of steam-coal char gasification by simulated fixed-bed gasifier with ligni te from Ulanqab, Inner Mongolia. The results showed that the 3-ring PAHs dominated in the cooled gas, the acenaphthylene and acenaphthene content were the highes t. As the gasification temperature increased from 900。C to 1 000。C, the total yield of PAHs decreased from 73. 19 mg 1 kg to 9. 40 mg 1 kg, namely a reduction by nearl y 90%. However, further increasing of temperature to 1 100 °C caused the total amount of PAHs increment. As the flow rate of steam increased from0. 17 mol 1 min to 0.61 mol/ min, the total yield of PAHs increased firstly and then decreased. When the steam flow rate was 0. 39 mol 1 min, the yield of PAHs reached the maximum val ue 73. 19 mg 1 kg, which was 1. 5 times of the minimum. The yield of PAHs could decrease when the temperature ranged from 1 000~ 1 100 °C. With the flow rate of st eam increased, PAHs yield decreased in cooled gas, so the PAHs in condensate water should be treated more intensively.

国家高技术研究发展计划(863计划)资助项目(2011AA050105)；教育部“大学生创新试验计划”资助项目(110301g)；中央高校科研业务费专项基金资助项目(2009QH13)；教育部新世纪人才支持计划资助项目(NCET-10-0773)；