Numerical simulation has been carried out to investigate the major factors affecting the time of composite regeneration due to coupling cerium-based additive and microwave for diesel particulate f3ilter(DPF). Effect o...Numerical simulation has been carried out to investigate the major factors affecting the time of composite regeneration due to coupling cerium-based additive and microwave for diesel particulate f3ilter(DPF). Effect on the composite regeneration time from various factors such as mass flow rate of exhaust gas, temperature of exhaust gas, oxygen concentration of exhaust gas, microwave power and amount of cerium-based additive are investigated. And a mathematical model based on fuzzy least squares support vector machines has been developed to forecast the endpoint of the composite regeneration. The results show that the relative error of endpoint forecasting model of composite regeneration is less than 3.5%, and the oxygen concentration of exhaust gas has the biggest effect on the endpoint of composite regeneration, followed by the mass flow rate of exhaust gas, the microwave power, the temperature of exhaust gas and the amount of cerium-based additive.展开更多
In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwav...In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwave for a diesel particulate filter was established based on field synergy theory. Performance evaluation on field synergy and composite regeneration of the diesel particulate filter was conducted by using the vortex crushing combustion and field synergy mathematical models. The results show that the peak temperature of the particulate filter body reaches 1180-1190 K when the regeneration time is 175 s, and there are optimal coordination degree between the velocity vector and temperature gradient of the filter body and the maximum ratio0.56-0.60 of the best burning regeneration region is obtained. Accordingly, the largest regeneration combustion rate inside the particulate filter body and the highest regeneration efficiency at the moment are achieved.展开更多
为研究SF6分子筛吸附剂回收处理最经济有效的方法,提出了负压热处理再生技术,阐述了吸附剂的负压热处理再生原理,分析了再生过程中分子筛各参数的变化。最后,进行了负压热处理实验,结合红外光谱技术来分析吸附剂中有害成分的含量变化,...为研究SF6分子筛吸附剂回收处理最经济有效的方法,提出了负压热处理再生技术,阐述了吸附剂的负压热处理再生原理,分析了再生过程中分子筛各参数的变化。最后,进行了负压热处理实验,结合红外光谱技术来分析吸附剂中有害成分的含量变化,重点研究了SF6分子筛吸附剂负压热处理最佳再生温度、最佳再生时间以及最佳负压压强,并进行了吸附等温曲线测试验证来确定回收的SF6分子筛吸附剂的解吸能力。实验结果表明,KDHF-03型分子筛吸附剂在20 k Pa、200℃下热处理2 h,可以达到最佳处理效果,SF6有害分解气体产物去除比例约为85%—90%,其吸附能力能恢复至使用前吸附能力的90%左右。展开更多
基金Projects(51176045,51276056)supported by the National Natural Science Foundation of ChinaProject(201208430262)supported by the National Studying Abroad Foundation Project of China
文摘Numerical simulation has been carried out to investigate the major factors affecting the time of composite regeneration due to coupling cerium-based additive and microwave for diesel particulate f3ilter(DPF). Effect on the composite regeneration time from various factors such as mass flow rate of exhaust gas, temperature of exhaust gas, oxygen concentration of exhaust gas, microwave power and amount of cerium-based additive are investigated. And a mathematical model based on fuzzy least squares support vector machines has been developed to forecast the endpoint of the composite regeneration. The results show that the relative error of endpoint forecasting model of composite regeneration is less than 3.5%, and the oxygen concentration of exhaust gas has the biggest effect on the endpoint of composite regeneration, followed by the mass flow rate of exhaust gas, the microwave power, the temperature of exhaust gas and the amount of cerium-based additive.
基金Projects(51176045,51276056)supported by the National Natural Science Foundation of ChinaProject(531105050037)supported by the Changjiang Scholars and Innovative Research Team in University,ChinaProjects(201208430262,201306130031)supported by the National Studying Abroad Foundation Project of China
文摘In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwave for a diesel particulate filter was established based on field synergy theory. Performance evaluation on field synergy and composite regeneration of the diesel particulate filter was conducted by using the vortex crushing combustion and field synergy mathematical models. The results show that the peak temperature of the particulate filter body reaches 1180-1190 K when the regeneration time is 175 s, and there are optimal coordination degree between the velocity vector and temperature gradient of the filter body and the maximum ratio0.56-0.60 of the best burning regeneration region is obtained. Accordingly, the largest regeneration combustion rate inside the particulate filter body and the highest regeneration efficiency at the moment are achieved.
文摘为研究SF6分子筛吸附剂回收处理最经济有效的方法,提出了负压热处理再生技术,阐述了吸附剂的负压热处理再生原理,分析了再生过程中分子筛各参数的变化。最后,进行了负压热处理实验,结合红外光谱技术来分析吸附剂中有害成分的含量变化,重点研究了SF6分子筛吸附剂负压热处理最佳再生温度、最佳再生时间以及最佳负压压强,并进行了吸附等温曲线测试验证来确定回收的SF6分子筛吸附剂的解吸能力。实验结果表明,KDHF-03型分子筛吸附剂在20 k Pa、200℃下热处理2 h,可以达到最佳处理效果,SF6有害分解气体产物去除比例约为85%—90%,其吸附能力能恢复至使用前吸附能力的90%左右。
