Gasification of landfill leachate in supercritical water: Effects on hydrogen yield and tar formation
Gasification of landfill leachate in supercritical water: Effects on hydrogen yield and tar formation
复制标题
超临界水中垃圾渗滤液的气化：对氢气产量和焦油形成的影响
DOI：
10.1016/j.ijhydene.2018.09.020
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发表时间：
2018-12
影响因子：
7.2
通讯作者：
Li Aimin
中科院分区：
文献类型：
--
作者：
Gong Yanmeng;Lu Jiaang;Jiang Weili;Liu Shuyang;Wang Wei;Li Aimin
在316不锈钢间歇式反应器中，对垃圾渗滤液进行了超临界水气化实验.考察了温度、压力、反应时间和氧化系数对污染物去除率和气化特性的影响。为了视觉上观察焦油和炭的形成，还使用毛细管石英反应器。结果表明，CO2、H2和CH4是最丰富的气体产物。温度对气化过程有明显的影响。升高温度可显著提高H2产率（GYH2）和TOC去除率（TRE）。当反应时间大于300 s时，H2、CH4和CO2的产率随反应时间的延长而增加，而CO、C2H4和C2H6的产率随反应时间的延长而降低。焦油和焦炭的形成是明显的毛细管石英反应器的内表面上。添加少量氧化剂可提高H2和CH4产率，减少焦油和焦炭的生成。在500 °C、25 MPa、600 s和0.2 OC条件下，GYH 2的最大值为231.3 mmol L− 1，是无氧化剂时的2.4倍。
Landfill leachate was gasified in supercritical water (SCW) in a batch reactor made of 316 SS. The effects of temperature, pressure, reaction time and oxidation coefficient (OC) on the pollutant removal efficiencies and gasification characteristics were investigated. To observe the formation of tar and char visually, a capillary quartz reactor was also used. Results indicated that CO2, H2and CH4were the most abundant gaseous products. Temperature has an appreciable effect on the gasification process. Increasing temperature enhanced the H2yield (GYH2) and TOC removal efficiency (TRE) significantly. Although the influence of reaction time on the fractions of gaseous products was negligible at time above 300 s, the yields of H2, CH4, and CO2increased with reaction time whereas the CO, C2H4and C2H6yields decreased. Tar and char formation was evident on the interior surface of capillary quartz reactor. Adding a little oxidant could increase H2and CH4yields and decrease tar and char formation. GYH2reached up to the maximum of 231.3 mmol L−1leachate at 500 °C, 25 MPa, 600 s and 0.2 OC, which was 2.4 times of that without oxidant.
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