零排放是一种高效的废水回用技术,是解决水资源短缺和煤化工废水排放污染的关键。零排放的应用虽然可以增加回用水,减少水污染,但其成本和能耗都很高。煤制烯烃废水处理包括生化处理、膜处理和蒸发结晶工艺。对不同机组的环境影响进行...零排放是一种高效的废水回用技术,是解决水资源短缺和煤化工废水排放污染的关键。零排放的应用虽然可以增加回用水,减少水污染,但其成本和能耗都很高。煤制烯烃废水处理包括生化处理、膜处理和蒸发结晶工艺。对不同机组的环境影响进行了分析。使用五种环境影响和两种人类健康影响来评估零排放系统的环境性能。例如,零排放系统的全球变暖潜力为1401.316 kg CO_(2-eq)。此外,进一步的经济分析包括水的平均成本和生命周期成本。水的平均成本为2.65$/t,生命周期成本的外部成本为7.68%。研究的重点在于设计煤制烯烃废水的整个零排放工艺,这将显著提高零排放系统的经济和环境性能。展开更多
The coal water slurry(CWS) prepared from low rank coals(LRC),such as lignite or subbituminous coals always has a higher viscosity and poor fluidity while the solid concentration is smaller than high rank coal water sl...The coal water slurry(CWS) prepared from low rank coals(LRC),such as lignite or subbituminous coals always has a higher viscosity and poor fluidity while the solid concentration is smaller than high rank coal water slurry.The reason is there are larger inherent moisture and oxygen composition in LRC.Under high temperature and high pressure conditions,LRC was upgraded in hot water in a short time period of an hour.The heating value of LRC was also increased in such a process,and the physical and chemical characteristics of LRC changed meanwhile to improve its slurry ability which meant a higher solid concentration with a lower viscosity.The results showed that after hot water treatments,the maximum solid concentration of Xiaolongtan CWS increased from 44.6% to 64.55%,while that of MIP CWS increased from 39.71% to 64.61%.The improvement of LRC slurry ability depended much on the final temperature of hot water treatments.The mechanism was explained by the chemical analysis of oxygen-containing groups and the measurement of contact angle between coal surface and water.展开更多
文摘零排放是一种高效的废水回用技术,是解决水资源短缺和煤化工废水排放污染的关键。零排放的应用虽然可以增加回用水,减少水污染,但其成本和能耗都很高。煤制烯烃废水处理包括生化处理、膜处理和蒸发结晶工艺。对不同机组的环境影响进行了分析。使用五种环境影响和两种人类健康影响来评估零排放系统的环境性能。例如,零排放系统的全球变暖潜力为1401.316 kg CO_(2-eq)。此外,进一步的经济分析包括水的平均成本和生命周期成本。水的平均成本为2.65$/t,生命周期成本的外部成本为7.68%。研究的重点在于设计煤制烯烃废水的整个零排放工艺,这将显著提高零排放系统的经济和环境性能。
文摘The coal water slurry(CWS) prepared from low rank coals(LRC),such as lignite or subbituminous coals always has a higher viscosity and poor fluidity while the solid concentration is smaller than high rank coal water slurry.The reason is there are larger inherent moisture and oxygen composition in LRC.Under high temperature and high pressure conditions,LRC was upgraded in hot water in a short time period of an hour.The heating value of LRC was also increased in such a process,and the physical and chemical characteristics of LRC changed meanwhile to improve its slurry ability which meant a higher solid concentration with a lower viscosity.The results showed that after hot water treatments,the maximum solid concentration of Xiaolongtan CWS increased from 44.6% to 64.55%,while that of MIP CWS increased from 39.71% to 64.61%.The improvement of LRC slurry ability depended much on the final temperature of hot water treatments.The mechanism was explained by the chemical analysis of oxygen-containing groups and the measurement of contact angle between coal surface and water.
