The removal of sulfur compounds(thiophene) from petroleum via extraction with ionic liquids was systematically studied.The ionic liquid[BMIM][PF_6]([BMIM]^+—1-butyl-3-methylimidazolium hexatiuorophosphate cation) was...The removal of sulfur compounds(thiophene) from petroleum via extraction with ionic liquids was systematically studied.The ionic liquid[BMIM][PF_6]([BMIM]^+—1-butyl-3-methylimidazolium hexatiuorophosphate cation) was used to investigate its effect on thiophene removal.The test results showed that a higher temperature and a greater mass ratio of the ionic liquids versus the oil containing the sulfur compounds both helped to remove the thiophene from the feed oil.At a temperature of 60℃and an ionic liquid/feed oil mass ratio of 20%,the desulfurization rate could reach 52.39%, with the extraction time specified at 40 minutes.展开更多
NaY zeolite was modified through dealumination with oxalic acid,and the HY zeolite was obtained by calcination of the modified NaY zeolite.The zeolite molding process was carried out at ambient temperature(25℃),and t...NaY zeolite was modified through dealumination with oxalic acid,and the HY zeolite was obtained by calcination of the modified NaY zeolite.The zeolite molding process was carried out at ambient temperature(25℃),and the influence of solid/fuel mass ratio and adsorptive desulfurization time on the HY zeolite were investigated through tests on static selective adsorptive desulfurization of FCC gasoline containing organic sulfur compounds(with a S content=135 ppm).The sulfur content and sulphide types in the FCC gasoline were analyzed by a GC 2010 sulfur analyzer and a GC-SCD chromatograph.The test results showed that the molded HY zeolite was better than the unmolded HY zeolite.At a static adsorptive desulfurization time on the molded HY zeolite equating to 6 hours,a solid/fuel mass ratio of 1:3,the sulfur content of FCC gasoline was decreased to 30 ppm,and the desulfurization rate was equal to 78%.When the breakthrough point of the molded HY was equal to 50 ppm,the molded HY zeolite was capable of adsorbing 4.86 mg of sulfur per gram of adsorbent.And the regeneration rate of molded HY zeolite was equal to 98%.展开更多
低压微电网运行时,由于各分布式储能单元初始状态不一致和输出线路阻抗差异,采用传统阻性下垂控制易出现荷电状态(state of charge,SOC)不平衡问题,由此提出一种基于改进阻性下垂控制的储能系统SOC均衡策略。该策略首先引入动态虚拟复阻...低压微电网运行时,由于各分布式储能单元初始状态不一致和输出线路阻抗差异,采用传统阻性下垂控制易出现荷电状态(state of charge,SOC)不平衡问题,由此提出一种基于改进阻性下垂控制的储能系统SOC均衡策略。该策略首先引入动态虚拟复阻抗,消除各逆变器输出线路阻抗差异,实现阻性下垂控制功率解耦和有功功率精确均分。然后改进传统阻性下垂控制方程,通过各分布式储能单元的SOC变化自适应调整下垂系数,确保低压微电网各储能单元在充放电过程的SOC平衡,并对下垂控制过程中的电压与频率偏差进行补偿,进一步提升系统稳定性。最后,通过搭建仿真模型验证了所提策略的有效性。展开更多
孤立直流微电网通常需配置由分布式储能单元(distributed energy storage units,DESUs)组成的储能系统。为延长储能系统的使用寿命,其应保持DESUs的荷电状态(state of charge,SOC)处于均衡状态,但在实际应用中,DESUs的容量可能存在差异...孤立直流微电网通常需配置由分布式储能单元(distributed energy storage units,DESUs)组成的储能系统。为延长储能系统的使用寿命,其应保持DESUs的荷电状态(state of charge,SOC)处于均衡状态,但在实际应用中,DESUs的容量可能存在差异,线路电阻不匹配,严重影响SOC的均衡效果。针对此问题,提出一种改进的下垂控制策略,通过指数函数嵌套幂函数,增强了下垂系数对SOC变化的辨识度,从而提升SOC的均衡效果;其次,通过均衡功率状态因子,使DESUs的输出功率按容量成比例地分配。为减少通信压力,采用稀疏通信网络来传递各DESUs所需的信息,即运用动态一致性算法估计全局平均值。最后,基于MATLAB/Simulink搭建的仿真模型验证了所提策略的有效性。展开更多
文摘The removal of sulfur compounds(thiophene) from petroleum via extraction with ionic liquids was systematically studied.The ionic liquid[BMIM][PF_6]([BMIM]^+—1-butyl-3-methylimidazolium hexatiuorophosphate cation) was used to investigate its effect on thiophene removal.The test results showed that a higher temperature and a greater mass ratio of the ionic liquids versus the oil containing the sulfur compounds both helped to remove the thiophene from the feed oil.At a temperature of 60℃and an ionic liquid/feed oil mass ratio of 20%,the desulfurization rate could reach 52.39%, with the extraction time specified at 40 minutes.
文摘NaY zeolite was modified through dealumination with oxalic acid,and the HY zeolite was obtained by calcination of the modified NaY zeolite.The zeolite molding process was carried out at ambient temperature(25℃),and the influence of solid/fuel mass ratio and adsorptive desulfurization time on the HY zeolite were investigated through tests on static selective adsorptive desulfurization of FCC gasoline containing organic sulfur compounds(with a S content=135 ppm).The sulfur content and sulphide types in the FCC gasoline were analyzed by a GC 2010 sulfur analyzer and a GC-SCD chromatograph.The test results showed that the molded HY zeolite was better than the unmolded HY zeolite.At a static adsorptive desulfurization time on the molded HY zeolite equating to 6 hours,a solid/fuel mass ratio of 1:3,the sulfur content of FCC gasoline was decreased to 30 ppm,and the desulfurization rate was equal to 78%.When the breakthrough point of the molded HY was equal to 50 ppm,the molded HY zeolite was capable of adsorbing 4.86 mg of sulfur per gram of adsorbent.And the regeneration rate of molded HY zeolite was equal to 98%.
文摘低压微电网运行时,由于各分布式储能单元初始状态不一致和输出线路阻抗差异,采用传统阻性下垂控制易出现荷电状态(state of charge,SOC)不平衡问题,由此提出一种基于改进阻性下垂控制的储能系统SOC均衡策略。该策略首先引入动态虚拟复阻抗,消除各逆变器输出线路阻抗差异,实现阻性下垂控制功率解耦和有功功率精确均分。然后改进传统阻性下垂控制方程,通过各分布式储能单元的SOC变化自适应调整下垂系数,确保低压微电网各储能单元在充放电过程的SOC平衡,并对下垂控制过程中的电压与频率偏差进行补偿,进一步提升系统稳定性。最后,通过搭建仿真模型验证了所提策略的有效性。
文摘孤立直流微电网通常需配置由分布式储能单元(distributed energy storage units,DESUs)组成的储能系统。为延长储能系统的使用寿命,其应保持DESUs的荷电状态(state of charge,SOC)处于均衡状态,但在实际应用中,DESUs的容量可能存在差异,线路电阻不匹配,严重影响SOC的均衡效果。针对此问题,提出一种改进的下垂控制策略,通过指数函数嵌套幂函数,增强了下垂系数对SOC变化的辨识度,从而提升SOC的均衡效果;其次,通过均衡功率状态因子,使DESUs的输出功率按容量成比例地分配。为减少通信压力,采用稀疏通信网络来传递各DESUs所需的信息,即运用动态一致性算法估计全局平均值。最后,基于MATLAB/Simulink搭建的仿真模型验证了所提策略的有效性。
