采用现场工程试验方法对德士古水煤浆气化炉协同处置煤液化残渣(CLR)过程中多环芳烃(PAHs)的排放特征及环境风险进行了系统研究,通过对空白工况(不混磨CLR制浆)和协同处置工况(混磨15％CLR制浆)下,气化炉内温度、压力与合成气组分变化及所有排放节点固态液态气态排放物中16种PAHs含量及毒性当量浓度分析,评估CLR协同处置过程中PAHs的环境风险及该技术的可行性.结果表明:德士古水煤浆气化炉协同处置15％液化残渣过程对气化炉自身产气量及压力无显著影响,炉内温度升高5～11℃,对H2和CO的产生具有促进作用;协同处置过程造成部分气态排放产物和液态排放物中PAHs含量增加,但增幅很小,且毒性当量浓度也远低于标准限值,新增环境风险很小;协同处置过程使固态排放产物中PAHs含量显著增加,但总毒性当量浓度依然较低,固态产物中PAHs的排放风险在可接受的范围内.%Field tests were conducted to research the emission characteristics and environmental risks of polycyclic aromatic hydrocarbons (PAHs) during co-processing of coal liquefaction residue (CLR) in Texaco coal-water slurry gasifier.Comparing the differences between blank condition (without mixing CLR in the slurry) and test condition (15％ CLR were mixed into the slurry),the changes of temperature,pressure and syngas composition in the gasifier were recorded,the toxicity equivalent concentration of 16 kinds of PAHs in all the solid,liquid and gas emissions were analyzed to evaluate the feasibility and environmental risks during the co-processing of CLR in Texaco coal-water slurry gasifier.Results showed that during the co-processing process,there had little impact on the pressure and syngas output of the gasifier,but made an increase of 5～11℃ of the temperature and promoted the formation of H2 and CO;the concentration of PAHs in part of the gas emission and liquid emission increased a little,but the toxicity equivalent concentration was still far lower than the standard limitation,has low environmental risk;the concentration of PAHs in solid emission products increased significantly,but the total toxicity equivalent concentration was also low,the environmental risk was in the acceptable range.
展开▼
