利用建立起来的理论模型,深入研究了联合电解催化交换(Combined Electrolysis and Catalytic Exchange,CECE)工艺中各种因素对氢同位素分离性能的影响。电解池分离因子的提高对浓缩倍数和脱氚率均有显著影响,降低电解池滞留量是提高浓...利用建立起来的理论模型,深入研究了联合电解催化交换(Combined Electrolysis and Catalytic Exchange,CECE)工艺中各种因素对氢同位素分离性能的影响。电解池分离因子的提高对浓缩倍数和脱氚率均有显著影响,降低电解池滞留量是提高浓缩倍数的有效手段。进料位置在1.5m处系统性能好于3m处;催化剂传质系数在3～4mol·m-3·s-1范围内,浓缩倍数和脱氚率基本呈线性增长。各种因素对HD/H2O和HT/H2O两个体系的影响具有相似的规律性,由于热力学因素的差异,相同条件下,HT/H2O体系分离性能好于HD/H2O。展开更多
核反应堆、乏燃料后处理厂运行过程中会产生各种含氚轻水,其中的氚若直接排放到环境中将会造成环境污染,影响人类健康。联合电解催化交换(combined electrolysis and catalytic exchange,CECE)技术能有效去除含氚轻水中的氚,减少环境中...核反应堆、乏燃料后处理厂运行过程中会产生各种含氚轻水,其中的氚若直接排放到环境中将会造成环境污染,影响人类健康。联合电解催化交换(combined electrolysis and catalytic exchange,CECE)技术能有效去除含氚轻水中的氚,减少环境中的氚排放。该技术主要由液相催化交换技术、水电解制氢技术和氢氧合成技术3大核心技术组成,具有除氚因子大、操作条件温和等优点,在国际上一直是研究热点。该文介绍了CECE 3个核心技术的研究现状和发展方向,同时针对含氚轻水除氚技术的工程应用难点提出了未来的研究方向。展开更多
探究微酸性电解水(SAEW)联合超声波(US)处理对中华马鲛品质的影响。以SAEW浸泡时间、物料质量与SAEW体积比(料液比,m:v)、US功率、时间为单因素设计单一杀菌实验,得到最佳杀菌工艺。以该优化工艺为基础,进一步观察了同时SAEW-US处理、...探究微酸性电解水(SAEW)联合超声波(US)处理对中华马鲛品质的影响。以SAEW浸泡时间、物料质量与SAEW体积比(料液比,m:v)、US功率、时间为单因素设计单一杀菌实验,得到最佳杀菌工艺。以该优化工艺为基础,进一步观察了同时SAEW-US处理、先US后SAEW处理、先SAEW后US处理3种不同微酸电解水与超声波联合处理方式对中华马鲛的pH值、挥发性盐基氮(TVB-N)、细菌总数(TBC)的影响。结果显示:在料液比1:3、浸泡15 min、超声功率300 W、超声15 min的条件下,TBC相比空白组下降了1.4 lg cfu/mL,杀菌效果最佳。表明微酸电解水和超声波处理均有良好的杀菌效果。同时进行SAEW-US处理相比先US后SAEW、先SAEW后US顺序组合,TVB-N低至4.90 mg/100 g,鱼肉更新鲜,TBC分别降低了0.1 lg cfu/mL、0.17 lg cfu/mL,杀菌效果更明显。综上所述,SAEW-US组合杀菌方式比单一SAEW和US有更好的杀菌保鲜效果,同时进行SAEW-US处理相比其他2个组合顺序有更好的灭菌效果。展开更多
The almost completely dense copper was prepared by ultrafine copper powder prepared with both methods of electrolysis and novel water-gas atomization through cold isostatic pressing(CIP)and sintering under atmospheric...The almost completely dense copper was prepared by ultrafine copper powder prepared with both methods of electrolysis and novel water-gas atomization through cold isostatic pressing(CIP)and sintering under atmospheric hydrogen.Fine copper powder possesses the higher sintering driving force,thereby promoting shrinkage and densification during the sintering process.The grain size of sintered samples by electrolytic copper powder is smaller than that prepared by the atomized copper powder,and the twin crystals are particularly prone to forming in the former sintered microstructure due to the raw powder with low oxygen content and high residual stress originating from the CIP process.The relative density of samples by electrolytic and atomized powder at 1000℃ sintering temperature achieves 99.3%and 97.4%,respectively,significantly higher than that of the powder metallurgy copper parts reported in the literature.Correspondingly,the ultimate tensile strength and yield strength of samples by both kinds of copper powder are approximately similar,while the elongation of the sintered sample by the electrolytic powder(60%)is apparently higher than the atomized powder(44%).The superior performance of samples fabricated by electrolytic powder is inferred from the full density and low oxygen level for there is no cuprous oxide in the grain boundaries.展开更多
文摘利用建立起来的理论模型,深入研究了联合电解催化交换(Combined Electrolysis and Catalytic Exchange,CECE)工艺中各种因素对氢同位素分离性能的影响。电解池分离因子的提高对浓缩倍数和脱氚率均有显著影响,降低电解池滞留量是提高浓缩倍数的有效手段。进料位置在1.5m处系统性能好于3m处;催化剂传质系数在3～4mol·m-3·s-1范围内,浓缩倍数和脱氚率基本呈线性增长。各种因素对HD/H2O和HT/H2O两个体系的影响具有相似的规律性,由于热力学因素的差异,相同条件下,HT/H2O体系分离性能好于HD/H2O。
文摘探究微酸性电解水(SAEW)联合超声波(US)处理对中华马鲛品质的影响。以SAEW浸泡时间、物料质量与SAEW体积比(料液比,m:v)、US功率、时间为单因素设计单一杀菌实验,得到最佳杀菌工艺。以该优化工艺为基础,进一步观察了同时SAEW-US处理、先US后SAEW处理、先SAEW后US处理3种不同微酸电解水与超声波联合处理方式对中华马鲛的pH值、挥发性盐基氮(TVB-N)、细菌总数(TBC)的影响。结果显示:在料液比1:3、浸泡15 min、超声功率300 W、超声15 min的条件下,TBC相比空白组下降了1.4 lg cfu/mL,杀菌效果最佳。表明微酸电解水和超声波处理均有良好的杀菌效果。同时进行SAEW-US处理相比先US后SAEW、先SAEW后US顺序组合,TVB-N低至4.90 mg/100 g,鱼肉更新鲜,TBC分别降低了0.1 lg cfu/mL、0.17 lg cfu/mL,杀菌效果更明显。综上所述,SAEW-US组合杀菌方式比单一SAEW和US有更好的杀菌保鲜效果,同时进行SAEW-US处理相比其他2个组合顺序有更好的灭菌效果。
基金Project(92066205)supported by the National Natural Science Foundation of ChinaProject(2019-Z10)supported by the State Key Lab for Advanced Metals and Materials of ChinaProject(FRF-MP-20-52)supported by the Fundamental Research Funds for the Central Universities,China。
文摘The almost completely dense copper was prepared by ultrafine copper powder prepared with both methods of electrolysis and novel water-gas atomization through cold isostatic pressing(CIP)and sintering under atmospheric hydrogen.Fine copper powder possesses the higher sintering driving force,thereby promoting shrinkage and densification during the sintering process.The grain size of sintered samples by electrolytic copper powder is smaller than that prepared by the atomized copper powder,and the twin crystals are particularly prone to forming in the former sintered microstructure due to the raw powder with low oxygen content and high residual stress originating from the CIP process.The relative density of samples by electrolytic and atomized powder at 1000℃ sintering temperature achieves 99.3%and 97.4%,respectively,significantly higher than that of the powder metallurgy copper parts reported in the literature.Correspondingly,the ultimate tensile strength and yield strength of samples by both kinds of copper powder are approximately similar,while the elongation of the sintered sample by the electrolytic powder(60%)is apparently higher than the atomized powder(44%).The superior performance of samples fabricated by electrolytic powder is inferred from the full density and low oxygen level for there is no cuprous oxide in the grain boundaries.
