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CALCULATION METHOD FOR EVALUATING THE SEPARATION PERFORMANCES OF HOLLOWFIBER MEMBRANE N_2-H_2 SEPARATORS 下载免费PDF全文
A mathematical model for evaluating the separation performances of hollow-fiber membrane N_2—H_2 separators has been established. The influences of operating parameters and membrane characteristics on the hydrogen concentration of the permeated gas and the percentage recovery of hydrogen have been studied with the help of a digital computer using this model. The correctness of the model is proved by comparing the calculation results with the data obtained from the field test of three φ100×3000mm industrial scale separators. 相似文献
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报告三维适形(3-dimensional conformal radiation therapy,3DCRT)和调强放疗(intensity-modulated radiation therapy,IMRT)治疗原发性肝癌(HCC)的基础和临床研究,建立了3DCRT和IMRT放疗HCC的技术,进行3个临床试验,获得了令人鼓舞的3年总生存率:28%~33%.治疗并发症主要是放射性肝病(RIIJD),此并发症的死亡率为76%,预防RILD最有效的方法是把对正常肝脏的放射剂量限制在安全的范围内.我国的HCC病人大都伴有肝硬化,伴发的肝硬化损害了肝脏对放射损伤的修复和肝脏再生的能力,他们的放射耐受剂量是(全肝平均剂量):Child-Push A病人23 Gy,Child-Push B病人6 Gy,这个耐受量显著低于目前国际上通用的30 Gy.研究建立了用于预测我国HCC病人放疗中发生RIID发生概率的Lyman数学模式,其参数明显不同于国外的模式,并将一整套适合我国国情的HCC放疗技术成功地进行了临床实践,证实了放疗可以作为不能手术肝癌的一种治疗选择. 相似文献
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浅谈混凝土新材料的开发与人居环境的改善 总被引:4,自引:1,他引:3
本文阐述了人居环境的基本概念及其所包涵的范围,从资源、能源、环境、材料性能等角度分析了混凝土与人居环境的关系,论述了开发新型的绿色混凝土材料对改善人类环境的重要性。 相似文献
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膜法富氮:膜性能与经济性 总被引:1,自引:0,他引:1
以目前PSA法制氮的经济指标为依据,对富氮气体分离膜的分离性能进行了分析。结果表明,如氮气生产规模为100Nm3/h,为能经济地制取98+%富氮气,膜的氧渗透率J0和分离系数a应分别达到3.5×10-5cm3/cm2·s·cmHg和5.5。 相似文献
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Approximate solutions for gas separation by hollow fiber membranes have been developedby several investigators.However,there are few reports of experimental verification of the models forhigh stage cut separations.In this work,an approximate mathematical model was developed and wasexperimentally verified for high stage cut air separation.Both countercurrent and cocurrent now pat-terns were used.In addition,the applicability of feed-inside mode for low stage cut air separation byhollow fiber membrane was examined.It was found that feed-inside mods was more advantageousthan feed-outside mode when used for the generation of oxygen-enriched air. 相似文献
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