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排序方式: 共有5367条查询结果,搜索用时 15 毫秒
101.
通过对杜邦膜NX2002TX和旭硝子公司的F-893膜在第1年应用中运行数据的比较。证明在使用第1年内,NX2002TX膜的性能高于F-893膜。 相似文献
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A novel structure floatation cyclone of natural inlet air has been designed, and its structural characteristics and floatation principle have been analyzed. The velocity and pressure distributions within the flow field of the floatation cyclone have been studied by Navier-Stokes equations. Based on the flow characteristics of the mixture of fine coal and water, reasonable boundary conditions are decided and the equations are modified, so that the final equations can describe the real flow state of the flow field of the floatation cyclone. The boundary surface position between float coal and tailings is determined and there is an air cylinder in the central region of the floatation cyclone. The research reveals the floatation mechanism of the floatation cyclone. The floatation results can be greatly improved by regulating the structural dimensions of cyclone. The experimental results show that the floatation cyclone is very effective for the floatation of fine coal grains. 相似文献
105.
天然气脱水是天然气净化过程中必不可少的环节。在对国内外脱水技术调研和查阅相关文献的基础上,总结了天然气开采后的各种脱水工艺,并对其原理、工艺特点等进行了概括分析,同时也对其在国内的应用现状进行了总结,并分析运行中存在的一些问题。通过对比发现,分子筛脱水法达到的天然气露点最低,一般用于深度脱水的环境;超音速脱水法具有结构简单,无需外部动力,免维护等优点,是天然气脱水技术发展的新趋势;内联式脱液器具有新型、紧凑、高效等特点,同时可用法兰连接在管道上进行在线预脱水,通常适用于海上平台及海底脱水系统。 相似文献
106.
Cyclone separators are widely used in industrial applications. The separation efficiency and pressure drop are the most important parameters to evaluate the performance of processing system. In the simulations, the flow behavior of gas and particles within a square cyclone separator is simulated by means of computational fluid dynamics. The RNG k - ε model and the Reynolds stress model (RSM) are used to model gas turbulence. The flow behavior is examined in the term of tangential velocity components, static pressure and pressure drop contour plots for flow field and solid volume fraction. The effects of the turbulence model and solid volume fraction on the square cyclone are discussed. The results indicate that the pressure drop increases with the increase of solid volume fraction, and increase with the increase of inlet velocities for two turbulence models, moreover, the simulations resuhs are compared with pressure field. For all runs, the RSM model gives a higher pressure drop compared to the RNG k - ε model. The RSM model provides well the forced vortex and free vortex, and captures better the phenomena occurring during intense vortex flow in the presence of walls within cyclone separators. 相似文献
107.
Erica Glatt Dominic Pjontek Craig McKnight Jason Wiens Michael Wormsbecker Jennifer McMillan 《加拿大化工杂志》2021,99(1):209-221
FLUID COKING is a continuous process that thermally converts heavy hydrocarbons, such as oil sands bitumen, to lighter and higher‐value products by horizontal spray injection onto a fluidized bed of hot coke particles. The cyclone sections of commercial fluid coker reactors experience fouling during typical operation, which limits unit run lengths. The main objective of this work is to improve fluid coker reliability by proposing cyclone fouling mitigation strategies based on practical operation modifications. This study developed a process simulation in Aspen Plus to establish the combined impact of vapour‐liquid equilibrium, endothermic thermal cracking reactions, pressure changes, and overall fluid dynamics in the selected fluid coker control volumes. The hydrocarbon composition was defined by applying an assay characterization of distillation data for representative hydrocarbon streams. Case studies were performed to determine the sensitivity of the predicted temperatures and hydrocarbon condensate flow rates for: (a) the burner‐to‐fluid coker transfer line temperature; (b) the hot coke flow rate; (c) hot coke entrainment from the freeboard region; and (d) scouring coke flow rate in the horn chamber. The scouring coke flow rate was identified as the most promising process lever to mitigate fluid coker cyclone fouling. 相似文献
108.
Ulrich Muschelknautz 《化学,工程师,技术》2021,93(1-2):91-107
A competitive alternative to the standard reverse flow cyclone for gas-solids separation is the uniflow cyclone. Gas and particles passing through it in only one direction, allowing a cost-effective usage in space limited applications. Comprehensive studies of uniflow cyclones have strongly improved their understanding and led to approved design criteria and calculation methods. Here it is shown that uniflow cyclones can achieve higher efficiencies per volume with a low pressure drop than standard cyclones. 相似文献
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Sn-filled carbon nanotubes(CNTs) were prepared in situ by electrolysis of graphite in molten LiCl/SnCl2 mixtures. Transmission electron microscopy(TEM) investigation shows that the as-made products contain abun-dance of carbon nanotubes and most of them are filled with metal nanoparticles or nanorods. Some nanotubes are e-ven inserted with long continuous nanowires more than several micrometers in length. Selected area electron diffrac-tion(SAED) patterns and energy dispersive X-ray spectroscopy(EDS) of the filled nanotubes confirm the presence of Sn inside the nanotubes. The encapsulated Sn was further identified as β-Sn with tetragonal structure. Based on the experimental results, a possible growth mechanism of the Sn-filled nanotubes was also discussed. 相似文献