共查询到19条相似文献,搜索用时 78 毫秒
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稀有气体通常利用沸点的差异进行深冷分离,相对于这种传统方法,膜技术具有高效、低耗和环保等优异性能.在膜技术中,膜材料的选择及其后处理是影响气体分离效果的重要因素.选择两种不同聚酰亚胺,PI-1 (BTDA-MDA/TDA)和PI-2 (PMDA/BTDA-TDA),研究了其单体结构对于稀有气体分离性能的影响.在此基础上选择性能较为优异的PI-2膜进行不同条件的热处理,研究热处理温度对其气体分离性能的影响.研究发现,通过改变聚酰亚胺的共聚组成,可以调节分离膜的气体选择性与渗透性.热处理会改变膜内分子链堆积、部分膜结构的生成或消失以及去除残余溶剂的塑化作用,进而改变膜的渗透分离性能.通过控制热处理条件,可以使膜的渗透性与选择性同时提升,He渗透系数增加至19.1 Barrer, He/CH4选择性提高了54%,O2/Xe选择性提升99%. 相似文献
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随着钢铁企业产能的不断提高,氧气、氮气、氩气管网系统潜在的风险更加突出。分析制氧站区内外氧气、氮气、氩气管网系统存在的故障点和风险性,提出改造方案,使气体供应更稳定、安全,减小对后续生产的影响。 相似文献
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锅炉房燃气缓冲管段计算与调压设备选择 总被引:1,自引:0,他引:1
燃气调压器在出口负荷突变为零时,调压器出口压力会在很短时间内大幅升高,从而引起调压器的安全保护装置的启动;通过设置缓冲管段,可有效控制调压器出口压力的变化,增加调压器运行的稳定性. 相似文献
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Mylvaganam KS 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》1989,36(2):144-149
A transit-time ultrasonic gas flowmeter for high-rangeability requirements, such as those encountered in flare-gas flow-metering, is presented. The concept of ray rescue angle for the orientation of the ultrasonic transducers in single-beam transit-time ultrasonic flowmeters is introduced to overcome the problem of ultrasonic beam drift in high-velocity flows. To overcome problems associated with noise at high velocities, a chirp signal is used. To preserve the accuracy of the meter at low velocities near zero flow, a combination of chirp and continuous-wave signals is used to interrogate the flow. Overall system performance is presented, based on results from extensive wind-tunnel tests. 相似文献
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Utilisation of sludge gas as a fuel for power generation in gas turbines is discussed. Such a scheme is likely to be very
cost effective particularly when the gas turbines are derived from aircraft after their flying life is over. The development
and preliminary trials of a demonstration plant in Bangalore, based on a Rolls Royce “Dart” turbo-prop engine were promising
and are described here. It is estimated that with the present proposal it may be feasible to meet over 30% of the domestic
consumption of electricity under favourable conditions. 相似文献
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J. H. Spurk 《Acta Mechanica》2004,172(1-2):75-81
Summary. The theory for gas loss from ventilated cavities under isothermal conditions is extended to the non isothermal case, where the gas inside the cavity has a temperature different from the water temperature. 相似文献
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《Materials at High Temperatures》2013,30(3):188-196
AbstractGas turbine hot-gas-path components, which include combustion liners, transition pieces, turbine nozzles and turbine buckets, are exposed to hot gases discharged from combustion systems and suffer from severe materials degradation and damage even in the early stage of operation. The severity of the damage and degradation increases with increasing inlet temperature and size of the gas turbines, which also increase the maintenance cost. ‘Lifing’ of components is, therefore, becoming a very critical issue. This paper describes several kinds of component damage and material degradation occurring in the 1,100°C- and 1,300°C-class heavy-duty gas turbines and then shows how we revised those component lives from the original design ones. Analytical-based assessment methods associated with condition-based assessment ones, some examples of assessment results, and component life extension technologies are also described. 相似文献