摘要
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一水蒸气气化条件下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1000℃，PAHs生成总量由73．19mg／kg降至9．40mg／kg，降幅达90％；进一步升高温度至1100℃，PAHs生成总量有所上升。水蒸气流量由0．17mol／rain增至0．61mol／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0．39mol／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l000～1100℃，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 （ P AHs） generated in underground coal gasification （ UCG） process, the experiment was carried out to study the generation and distribution laws of P AHs in the process of steam -coal char gasification by simulated fixed-bed gasifier with lignite from Ulanqab, Inner Mongolia. The results showed that the 3-ring P AHs dominated in the cooled gas, the acenaphthylene and acenaphthene content were the highest.As the gasification temperature increased from 900 ℃ to 1 000 ℃ ,the total yield of PAHs decreased from 73.19 mg/kg to 9.40 mg/kg,namely a reduction by nearly 90%.However,further increasing of temperature to 1 100℃ caused the total amount of PAHs increment.As the flow rate of steam increased from 0.17 moVmin to 0.61 moVmin,the total yield of PAHs increased firstly and then decreased. When the steam flow rate was 0.39 moVmin,the yield of P AHs reached the maximum value 73.19 mg/kg, which was 1. 5 times of the minimum. The yield of P AHs could decrease when the temperature ranged from 1 000 - 1 100 ℃. With the flow rate of steam increased, P AHs yield decreased in cooled gas, so the P AHs in condensate water should be treated more intensively.
出处
《煤炭科学技术》
CAS
北大核心
2014年第3期108-112,116,共6页
Coal Science and Technology
基金
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)
关键词
煤炭地下气化
多环芳烃
水蒸气气化
冷凝水
低温煤气
underground coal gasification
polycyclic aromatic hydrocarbons （ P AHs）
steam gasification
condensate water
cooled gas
