共查询到19条相似文献,搜索用时 578 毫秒
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1Φ1 200 mm尿素合成塔结构Φ1 200 mm尿素合成塔为多层包扎式结构,衬里为316 Lmod尿素级不锈钢,厚度为8 mm;第1层容器板材质为16 MnR,厚度为12 mm;盲层板和多层板材质为15 MnVR,厚度为6 mm。塔内原有3层旋流板和2层多孔板。2007年,为提高CO2转化率、减少物料返混,增设了13层GC型塔板,现共有18层塔板。2存在的问题该尿素合成塔自投运以来,严格按工艺指标进行操作;并按规定定期检验,每次检验后均对衬里出现的缺陷进行了修复,衬里使用良好,没有出 相似文献
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新型尿素合成塔内件改造总结 总被引:1,自引:0,他引:1
能否提高CO2转化率是尿素合成塔内件改造的关键所在。在改造中,该厂选用了宁波远东塔器工程公司制造的球帽型合成塔内件。投运后,t尿素蒸汽消耗为1.42t(较前降低5t/h);CO2转化率为66%~68%(较前提高2%)。该文对其改造原理及方案予以了叙述;对改造前后的情况进行了比较。 相似文献
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在尿素装置设计能力由6万t/a提高到10万t/a的改造中,介绍了采用双塔并联工艺流程和改进尿素合成塔塔板的优越性,分析和论述了中压系统、低压系统、蒸发系统以及相关设备的改进目的和改造方案,结果表明,改造后生产能力达到了16万t/a,日产尿素达到520t/d,吨尿素蒸汽消耗从投产时的1,58t降低到1,3t,吨尿素氨耗从590kg降低到573kg。 相似文献
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介绍了临泉化工股份有限公司尿素装置扩产节能技术改造的要求;论述了尿素装置7个部分的改造内容;提出了合成塔内件采用新型GC型塔板、分解系统采用预分离-预精馏流程等项改造方案;总结了改造后生产运行效果。结果表明:放空气中氨含量从8%降低到2%以下,在保证生产强度增加20%的情况下,CO2转化率从64%增加到68%,吨尿素节省蒸汽50kg,操作弹性在40%~100%范围内,产品质量达到优等品标准。 相似文献
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在依靠原有流程,充分利用原塔外换热器的原则下,通过改造方案的对比,选用JW均温型甲醇塔内件对原轴径向甲醇塔进行了改造。对改造后运行效果进行了总结,结果表明,CO转化率从92%提高到96%,甲醇日产量可达65t. 相似文献
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尼龙6聚合管内微分发热量与温度分布 总被引:3,自引:0,他引:3
<正>1引言 尼龙6是合成聚酚胺生产中最重要的产品之一[1],目前工业上多数采用水解聚合。本文涸绕尼龙6聚合反应工程开发的一系列工作都是为这一技术路线国产化提供理论基础。近卫0年来,尼龙6聚合的各种主、副反应精确的动力学数据已有报道[2,3],目前的重点已转向工业化生产反应器中各种物理过程的模拟,诸如传热、流动、混合、停留时问分布、蒸发脱水以及过程优化控制等领域。 相似文献
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The computational fluid dynamics model with porosity and drag coefficient was used to describe fluid flow in an axial flow fixed bed according to the characteristics of fluid flow in the fixed-bed of the reactor. The commercial computational fluid dynamics (CFD) code CFX was used to simulate the flow field in the axial flow fixed bed. The simulation predictions are in good agreement with experimental results of a large cold model. The influence of gas distributor on the flow field in the axial flow fixed bed was studied. A suitable gas distributor was used to attain less than 0.06 kPa radial pressure difference and less than 5.2% radial velocity difference in fixed bed. 相似文献
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Davood Iranshahi Ehsan Pourazadi Khadijeh Paymooni Mohammad Reza Rahimpour 《American Institute of Chemical Engineers》2012,58(4):1230-1247
Naphtha reforming units are of high interest for hydrogen production in refineries. In this regard, the application of membrane concept in radial‐flow tubular naphtha reactors for hydrogen production is proposed. Because of the importance of the pressure drop problem in catalytic naphtha reforming units, the radial‐flow reactors are proposed. A radial‐flow tubular membrane reactor (RF‐TMR) with the radial‐flow pattern of the naphtha feed and the axial‐flow pattern of the sweeping gas is proposed as an alternative configuration for conventional axial‐flow tubular reactors (AF‐TR). The cross‐sectional area of the tubular reactor is divided into some subsections in which walls of the gaps between subsections are coated with the Pd‐Ag membrane layer. A dynamic mathematical model considering radial and axial coordinates ((r, z)‐coordinates) has been developed to investigate the performance of the new configuration. Results show ~300 and 11 kg/h increase in aromatic and hydrogen production rates in RF‐TMR compared with AF‐TR, respectively. Furthermore, smaller catalyst particles with higher efficiency can be used in RF‐TMR due to a slight pressure drop. The enhancement in aromatics (octane number) and hydrogen productions owing to applying simultaneously the membrane concept and radial‐flow pattern in naphtha reactors motivates the application of RF‐TMR in refineries. © 2011 American Institute of Chemical Engineers AIChE J, 2012 相似文献