膜法富氧技术在玻璃熔窑上的应用

阐述了膜法富氧的原理,介绍了富氧燃烧技术在玻璃池窑中的设计和应用情况,指出富氧燃烧技术在节能和环保方面的重要意义。结合公司在膜法富氧燃烧的施工实例,证明该技术在节能及环保方面将有广阔的前景。     

膜法富氧技术的应用及研究进展

膜法富氧技术操作方便、节能、环保,是气体分离膜研究的热点之一,随着全球性的节能环保工作的开展,膜法富氧技术正日益得到广泛的重视。本文简要介绍了膜法富氧在化工、医疗保健等领域的应用并对膜法富氧技术的未来发展方向进行了初步探讨。     

浅谈膜法富氧的技术及其应用

本文介绍了近年来膜法富氧技术的应用研究,初步探讨了目前膜材料的氧氮分离性能及在工业、商业中的应用,分析了膜法富氧存在的技术问题以及发展趋势。     

膜法气体分离技术在石化中的应用新进展

综述了膜法富氧、富氮、氢回收技术及膜法与其他相关技术集成在石化中的最新应用进展。包括用于各种燃料和大多数工业炉窑的局部增氧助燃 ,用于催化裂化装置的富氧再生、富氧克劳斯硫回收、富氧处理废水和含油污泥以及注氮强化采油等。指出随着渗透率大、选择性高的膜材料的研制与开发成功以及膜法和有关分离技术的优化集成 ,膜法气体分离技术在石化工业中的应用将更加广泛     

大规模膜法空气分离技术应用进展

富氧空气、氧气、氮气以及其他一些空气分离产品应用领域的增加 ,极大地推动了空气分离新技术的大规模发展。膜法空气分离以其节能、便利、安全等优异特性在空气分离产品的工业生产中展现出了极大的发展潜力。综述了现有膜材料的氧氮分离性能、制氧装置和制氮装置的研究开发及其在柴油发动机富氧燃烧等方面的应用研究 ,分析了膜法空气分离大规模商业化必须克服的技术障碍 ,从新型高性能膜材料的合成与制备方面提出了实现大规模膜法空气分离应用应采取的措施。     

膜法富氧技术在化工中的应用研究

膜法富氧技术系指利用空气中各组分透过高分子膜时的渗透速率不同,在压力差驱动下,将空气中的氧气富集来获得富氧空气的技术。工业发达国家称之为“资源的创造性技术”,目前主要有两种工艺流程,即正压法和负压法,前者适用于氧氮同时应用或对氧浓度要求较高的场合。早在 80年代初,许多发达国家都投入了大量人力物力来研究膜法富氧技术,特别是日本,其通产省就资助了旭硝子等 7家公司和研究所参加“膜法富氧燃烧技术研究组”。由于能源紧张,日本先后有近 20家推出膜法富氧装置。国内从 1986年起有中科院的 4个研究所开始国家“七五”…     

膜法富氧技术的现状与未来

本文比较了从空气中富集氧气的途径与各自工艺特点，追述富氧膜的发展历史并综述了不同材料和类型的富氧膜分离机理与研究现状，提出今后膜法富氧技术的主要开发方向。     

膜法富氧的应用进展

膜法富氧能用于所有燃料、所有窑炉的助燃，社会效益和经济效益显著。膜法富氧用于医疗保健比其它氧源体积小，操作简单，安全和经济。同时探讨了用于柴油机和造气炉的可行性。     

膜法富氧助燃技术用于石化行业新进展

膜法富氧助燃技术,特别是局部增氧助燃技术在石化行业的应用越来越广泛,目前成功实施了9种窑炉。主要介绍了该技术在芳烃加热炉、减压加热炉、油田加热炉和煤炉中的应用,不仅明显节能,而且延长炉龄和明显减少CO、CO2、NOx、SOx及粉尘的排放,指出局部增氧助燃技术在石化行业的节能减排和节约资源等方面将有广阔的前景。     

减压加热炉节能技术改造

大港石化公司减压蒸馏加热炉应用了ATT陶瓷涂层技术、膜法富氧和局部增氧射流助燃技术,降低炉壁、炉膛和排烟温度,降低空气过剩系数,提高了加热炉热效率,达到了节能减排的目的。     

Facilitated oxygen transport through a Nafion membrane containing cobaltporphyrin as a fixed oxygen carrier

A Nafion membrane containing a cobaltporphyrin (CoP) complex as a fixed oxygen carrier was prepared with a view to facilitate oxygen transport through the membrane. The design concept of the CoP-loaded Nafion membrane was based on the CoP's modification to place the CoP complex in a hydrophobic domain of the microphase-separated structure, in order to facilitate the oxygen transport and to maintain proton conductivity. The oxygen permeability through the CoP-loaded Nafion membrane was higher than the nitrogen permeability, and significantly enhanced at relatively-low oxygen pressures of the upstream, indicating that the fixed CoP complex acted as an oxygen hopping site to facilitate the oxygen transport. The oxygen/nitrogen permselectivity increased with the content of CoP in the Nafion membrane. Electrochemical reduction of oxygen at a glassy carbon electrode, modified with a Pt/C catalyst and the CoP-loaded Nafion membrane, provided additional support for the facilitated oxygen transport by the membrane. Increased current for the reduction of oxygen on the modified electrode by loading CoP indicated that the CoP offered the oxygen hopping site in the Nafion membrane.     

Transfer of gas to dissolved oxygen in water via porous and nonporous polymer membranes

The transfer rates of oxygen via polymer membranes in gas–membrane–gas and gas–membrane–water (dissolved oxygen) were investigated with various porous membranes and compared with results of silicone rubber sheet (nonporous, homogeneous polymer membrane). With a nonporous membrane, the permeability constant obtained by gas–membrane–gas represents the true membrane permeability in gas–membrane–water system, and consequently the transport resistance due to boundary layer can be quantitatively estimated. With a porous membrane, the data in gas–membrane–gas system (under applied pressure) merely represent the gas effusion rate of the membrane and are not directly related to the dissolved oxygen transfer rate in gas–membrane–water system. The penetration of liquid water into the pores of porous membrane is the most important controlling factor for the dissolved oxygen transfer rate of a porous membrane. With a porous membrane in which liquid water does not penetrate into the pore, the overall transfer rate of dissolved oxygen reaches the level which corresponds to that of the boundary layer found with silicone rubber membrane.     

PDMS/TEOS杂化氧敏感膜的研究

聚二甲基硅氧烷和四乙氧基硅氧烷交联杂化的同时固定荧光指示剂4,7-二苯基-1,10-菲咯啉钌,制备的氧敏感膜有良好的响应可逆性,对氧饱和水溶液和对氮饱和水溶液测定的相对标准偏差分别为1.81%（n=6）和0.99%（n=6）,响应时间小于30 s。水溶液中溶解氧浓度在0～43.4 mg/L范围内线性良好,线性相关系数0.994 8,检测限为0.42 mg/L。该氧敏感膜的制备工艺简单,条件易控,且具有良好的机械性、柔韧性和高疏水性,可快速灵敏的测定水中溶解氧。     

Analysis of oxygen permeation through dense ceramic membranes with chemical reactions of finite rate

The oxygen permeation through oxygen ionic or mixed-conducting ceramic membranes under reaction conditions was examined with a model taking into account of different electrical transport mechanisms (p-type and n-type transports) and finite reaction rate. It was demonstrated that with a reaction consuming oxygen in one side of the membrane, the oxygen partial pressure in the reaction side decreases and the oxygen permeation flux increases with the increase in the reaction rate for both the p-type and the n-type transport dominated mechanism. The increase in reaction rate causes a transition of the transport mechanism from p-type to n-type. This transition leads to an increase in the permeation flux by up to 30 times. This effect offers one explanation for the large discrepancies in published permeation data for membrane reactors of partial oxidation reaction employing an oxygen permeable dense ceramic membrane. For a membrane with a specific transport mechanism, the increase in the reactant partial pressure causes an increase in the reaction rate and oxygen permeation flux. However, the increase in the inlet inert gas amount has a complicated effect on the oxygen permeation flux because it lowers both oxygen partial pressure and the reaction rate at the same time.     

Evaluation of mixed‐conducting lanthanum‐strontium‐cobaltite ceramic membrane for oxygen separation

In this study, La_0.4Sr_0.6CoO_3‐δ (LSC) oxide was synthesized via an EDTA‐citrate complexing process and its application as a mixed‐conducting ceramic membrane for oxygen separation was systematically investigated. The phase structure of the powder and microstructure of the membrane were characterized by XRD and SEM, respectively. The optimum condition for membrane sintering was developed based on SEM and four‐probe DC electrical conductivity characterizations. The oxygen permeation fluxes at various temperatures and oxygen partial pressure gradients were measured by gas chromatography method. Fundamental equations of oxygen permeation and transport resistance through mixed conducting membrane were developed. The oxygen bulk diffusion coefficient (D_v) and surface exchange coefficient (K_ex) for LSC membrane were derived by model regression. The importance of surface exchange kinetics at each side of the membrane on oxygen permeation flux under different oxygen partial pressure gradients and temperatures were quantitatively distinguished from the oxygen bulk diffusion. The maximum oxygen flux achieved based on 1.6‐mm‐thick La_0.4Sr_0.6CoO_3‐δ membrane was ～4.0 × 10^?7 mol cm^?2 s^?1at 950°C. However, calculation results show theoretical oxygen fluxes as high as 2.98 × 10^?5 mol cm^?2 s^?1 through a 5‐μm‐thick LSC membrane with ideal surface modification when operating at 950°C for air separation. © 2009 American Institute of Chemical Engineers AIChE J, 2009     

钙钛矿型透氧膜及其在甲烷部分氧化中的应用

钙钛矿型透氧陶瓷膜是同时具有氧离子和电子导电性的功能无机膜,在纯氧分离和甲烷部分氧化膜反应器中具有重要的潜在应用.介绍了钙钛矿型透氧陶瓷膜的氧渗透原理、膜材料的结构性能及其在甲烷部分氧化制合成气中的应用研究进展,并对透氧膜所面临的挑战进行了论述.     

Catalytic Membrane Reactors – Lab Curiosity or Key Enabling Technology?

Two industrially interesting partial oxidations have been performed in catalytic membrane reactors with oxygen‐transporting membrane: aromatization of natural gas and oxidation of ammonia to nitric oxide. In both reactions, the oxygen used has been separated from air through a perovskite membrane, which also is the catalyst for the ammonia oxidation. When conducting the methane aromatization in an oxygen‐transporting membrane reactor, coke deposition is reduced and the aromatics yield is higher than that of a reference non‐oxidative fixed‐bed reactor.