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近年来,NHD脱硫、脱碳技术已得到广泛应用,不仅应用于合成氨原料气的脱硫、脱碳,并在其它领域扩展,如甲醇生产过程中原料气的脱硫、脱碳;醋酸低压羰基合成制CO的脱硫、脱碳;硫回收尾气的脱硫处理等。由于制气原料、制气方法及预处理工艺的不同,其COS含量也不相同,甲醇合成反应要求将合成气中总硫脱除达到0.1×10-6以下,以保护催化剂,一般通过干法脱硫工艺来实现,在NHD脱碳的同时也脱除掉大部分COS,结合实际问题,为合理设计精脱硫工艺装置提供依据。 相似文献
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NHD脱硫脱碳技术应用 总被引:1,自引:0,他引:1
NHD溶剂是一种新型高效脱硫脱碳溶剂,在国内外已广泛用于天然气、油田伴生气、炼厂气、燃料气、煤制气、城市煤气、合成气等工艺气体中H2S、CO2、COS、硫醇等有害成分的脱除。介绍了国内几家化肥厂应用NHD脱硫脱碳装置运行情况,生产中存在的问题及解决办法。 相似文献
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晋煤天源化工有限公司(以下简称天源公司)脱碳装置采用NHD脱碳工艺,该装置运行5年以来十分稳定,但近期也暴露出脱碳气中CO2含量超标等问题。1工艺流程1.1工艺气流程来自变换气脱硫装置的变脱气首先进入气体换热器,与净化气以及CO2产品气换热,再经原料气分离器进入脱碳塔,气体由下而上与塔顶喷 相似文献
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为解决传统湿法脱硫工艺中有机硫脱除效率低、副产物多等问题,依托配方型溶剂脱硫工艺,以聚乙二醇二甲醚(NHD)、N-甲基二乙醇胺(MDEA)和水为原料构建新型湿法催化水解羰基硫(COS)脱硫体系。优化复配溶剂组成比例,确立配方溶剂组成为25% MDEA/15% H2O/60% NHD,考察了脱硫操作参数、反应温度、气体浓度、气体流量等因素对脱硫的影响,使用气相色谱和离子色谱分析探究脱硫过程及反应动力学。结果表明,在低温(298.15~343.15 K)、常压条件下对COS的脱除效率达80%以上;复配溶液将吸收后的COS催化水解为H2S和CO2,吸收过程符合准一级反应动力学。该脱硫液中有机溶剂含量占85%以上,可解决脱硫副产物产生多和碱耗大的问题,是一种新型有机介质脱硫工艺。 相似文献
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阐述了甲醇生产中NHD法脱硫脱碳的技术进展,脱硫工序针对原料气含硫量不同,分别采用三塔流程配两级闪蒸和二塔流程配两级闪蒸,脱碳工序采取设计节能流程工艺、新型常解气提塔及改变气提方式等措施。实践证明,NHD工艺用于甲醇生产,更具高效节能的特点。 相似文献
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NHD脱硫脱碳技术在醋酸生产中的应用综述 总被引:1,自引:0,他引:1
NHD脱硫、脱碳技术具有能耗低、净化度高、设备和流程简单等特点,已在合成氨、甲醇生产企业的脱硫、脱碳中得到了成功应用,并取得了丰富的实践经验.文章介绍了NHD脱硫脱碳在兖矿国泰化工有限公司醋酸生产方面的应用,经该技术净化后的煤气质量优良,有效的保护了醋酸合成催化剂.因此NHD脱硫脱碳技术在以煤为原料合成醋酸的煤气净化中的应用是成功的. 相似文献
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A pump suitable for use with gas electrodes, in which recirculation of the gas is necessary, is described. The system to which the cell with the gas electrode and the pump are connected does not change its volume when the pump is in operation. The pump works as follows: an embolus, consisting of a Tefloncoated magnetic stirring bar, placed inside a glass tube having an internal diameter slightly larger than the diameter of the bar, is moved from the outside with a permanent magnet, which in turn is moved horizontally along the tube by means of a mechanical assembly driven by an electric motor. The motion of the embolus is accompanied by the closing and opening of glass valves which allow the gas to circulate in the desired direction. The pump, used in conjunction with a vacuum line, operates from pressures as low as 60 Torr to above atmospheric pressure. The operation of the pump is unaffected by organic gases and most inorganic gases. 相似文献
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气辅成型中气道设计对气体穿透的影响 总被引:1,自引:0,他引:1
气道的设计是气体辅助注射成型中的一个重要因素,不同的气道对气体穿透会产生不同的效果。利用模塑软件Moldflow分析了不同尺寸的矩形截面气道的气体穿透情况。结果表明,当量直径太小的气道,气体容易渗透到薄壁区域;而当量直径太大,气体穿透长度会减小。最后,还给出了一些气道设计的基本原则。 相似文献
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Rob Klaassen 《Filtration+Separation》2003,40(10):26-28
Membrane gas absorption (MGA) is an efficient and flexible way to carry out gas-liquid (G-L) contacting operations with hollow fibre membranes. The main advantages of membrane gas absorption over conventional G-L contactors is the compactness and low weight of the installation, the standard modular construction elements and the flexible operation. Gas and liquid flow can be controlled independently in the MGA process, which makes operation over a wide range of liquid and gas flow rates possible. In a MGA installation no entrainment, flooding, channelling or foaming occurs. Rob Klaassen and Albert E Jansen, TNO Environment, Energy and Process Innovation, discuss the principle of this technology, the benefits of newly developed membrane modules and their potential applications. 相似文献
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A comparative study of nine synthesis gas technologies have been carried out. The basis was syngas feed to a 2500 MTPD methanol plant. Material and energy balances were calculated, investments and operational costs were estimated, and a comparison was made. The comparison indicates that autothermal reforming and combined reforming with prereformer are preferable among the proven technologies. Among emerging technologies GHR, KRES and CPO have an economic advantage. However, the margins are probably too small to be significant. 相似文献