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研究了加氢精制装置换热系统铵盐结晶堵塞与其他同类装置不同的现象,分析了反应流出物高压换热器管束结盐的原因,提出了防范和改进的措施,通过控制原料总氯含量、硫含量及换热器出口温度,可有效防止加氢高压螺纹缩紧环换热器管束结盐,保证了装置长周期运行的要求. 相似文献
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重油加氢精制装置高压螺纹换热器,因换热器换热后温度低导致换热器铵盐结晶,反应系统压降大,循环氢压缩机负荷增加,被迫停工。通过分析高压螺纹换热器结盐的原因,提出改进措施和预防措施,通过控制原料中杂质含量和控制反应产物换热器温度,以此来延缓高压换热器结盐,实现装置平稳运行。 相似文献
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由于水煤气净化系统积累的氨与部分冷凝水在换热器管程内壁反应形成的盐溶液在管程内冷却结晶,造成变换工序阻力异常增大.增设氨分离装置,利用变换工序副产的低压蒸汽加热分解铵盐并汽提氨,可以有效解决铵盐结晶问题. 相似文献
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沈愉 《中国石油和化工标准与质量》2022,(4):35-36
中石油云南石化有限公司1300×104 t/a常减压装置常压塔顶油气冷凝系统腐蚀,导致常顶油气换热器E-102A-D泄漏频次增加.通过对腐蚀产物和防腐数据分析总结,表明换热器的腐蚀原因为低温HCL-H2S-H2O腐蚀和铵盐垢下腐蚀.根据腐蚀原因,制定并应用了常顶换热器E-0102A-D出口弯头喷钎、提高常顶油气-热水换... 相似文献
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石脑油加氢换热器铵盐结晶的原因分析及处理 总被引:1,自引:0,他引:1
分析了石脑油加氢换热器铵盐结晶的原因 ,提出并采用了断续加注脱氧水的方法。实践表明 ,此方法简便易行 ,效果令人满意 相似文献
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对中海炼化惠州炼油分公司360万吨/年煤柴油加氢裂化装置运转过程中出现的反应系统压降升高问题进行了分析,介绍了反应系统压降升高对装置造成的影响,以及在装置高压换热器管壳程均出现铵盐结晶问题时的处理过程等。 相似文献
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介绍湿法磷酸典型的强制循环真空蒸发工艺流程。对磷酸浓缩装置运行过程中的常见问题(闪蒸室真空度不够,闪蒸室绝压偏高而温度正常,石墨换热器出口酸温偏低,石墨换热器温差过大等)进行原因分析,并提出处理方法。 相似文献
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In this research, effect of water and hydrogen perm-selective membranes via different recycle cases in a thermally double-coupled two-membrane reactor (TDCTMR) has been investigated. Methanol and direct dimethyl ether (DME) synthesis from natural gas as exothermic reactions have been thermally coupled with cyclohexane dehydrogenation as an endothermic reaction. Hydroxy sodalite (H-SOD) and Pd/Ag membranes have been employed for removing water from methanol side and injection of hydrogen to DME side respectively. Three different recycle stream cases have been studied for the performance enhancement of TDCTMR. In the first case, the outlet stream from DME reactor is recycled to itself. Also, in the second case, the outlet stream from methanol side is recycled to DME side and finally, the third case is that the mixture of methanol and DME outlet streams are recycled to DME side. The results of these three cases are compared with thermally double coupled reactor (TDCR). Results show that hydrogen production in cyclohexane side of TDCTMR increases 8.32%, 22.89% and 23.88% for cases 1, 2 and 3 in comparison to TDCR respectively. Also, DME and methanol production enhances 38.38% and 13.3% for case 3 (best case) in comparison to TDCR respectively. 相似文献
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T.A.G. Langrish 《Chemical engineering journal (Lausanne, Switzerland : 1996)》1998,70(3):221-229
Models of parallel-flow (cocurrent and countercurrent) dryers have been developed within a steady-state process flowsheeting package (ASPENplus™) and applied to a case study involving a countercurrent timber veneer dryer to evaluate the ease of control for arrangements which include the use of recycle or a heat exchanger at the dryer exit to preheat the incoming air. The technique involves interfacing
models, which allow both dynamic and steady-state analyses to be performed, with the ASPENplus™ package. These
models may also be called from the SPEEDUP™ package, but in this case only the steady-state behaviour has been studied in ASPENplus™ by running the unsteady-state analyses to steady state using a false time-stepping technique. For the case study of the countercurrent timber veneer dryer, the use of a heat exchanger is predicted to require 13% less fuel gas than no recycle and 6% less than the use of 30% outlet gas recycle at the optimum operating condition (minimum fuel gas use) for each system. The system is also predicted to be easier to control with a heat exchanger than with recycle, according to the Relative Gain Arrays for the systems studied. For the countercurrent veneer dryer, the use of 30% outlet gas recycle increases the outlet solids temperature compared with cases both with no recycle (corresponding to the dryer on its own) and with a heat exchanger between the outgoing and incoming gas, since recycle moves the operating region up the vapour pressure/temperature curve so that the sensitivities of both the outlet solids temperature and the outlet solids moisture content to the gas flowrate increase dramatically. This means that 30% recycle changes the preferred control pairings in this case from (solids outlet temperature, inlet air flowrate), (solids outlet moisture content, fuel gas flowrate) to (solids outlet temperature, fuel gas flowrate), (solids outlet moisture content, inlet air flowrate). The indicated pairings of controlled and manipulated variables differ with the amount of recycle, suggesting that dynamic analysis needs to be performed to assess the optimum control method for this system. 相似文献
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长岭炼油化工总厂20000Nm3/h 制氢装置通过采用JT-1G 型加氢催化剂, 反应器入口温度降至200℃, 停开干法脱硫循环机, 加氢后气体的质量指标达到后工序要求。不但降低了成本, 而且简化了工艺, 操作更方便, 并为制氢工艺进一步优化后, 停开制氢干法脱硫反应器奠定了基础。 相似文献
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基于ASPEN PLUS软件的甲烷化工艺模型 总被引:2,自引:0,他引:2
利用ASPEN PLUS对煤制天然气的甲烷化工艺进行了流程模拟。模型模拟得到了替代天然气成分、反应器出口温度、循环比、分流率,揭示了循环比和分流率对反应器出口温度的影响。通过该模型,能够为工艺方案比选、优化设计提供模拟和预测。 相似文献
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针对加氢处理装置脱硫后循环氢中甲烷含量变化原因进行了分析。结果表明,加氢处理装置补充新氢中甲烷含量增大,反应温度升高,反应器新加入较高活性催化剂FF-24,均会引起脱硫后循环氢中甲烷含量增大。当原料油密度892~909kg/m3时,组分变化较小,对脱硫后循环氢甲烷含量影响不大。为了控制脱硫后循环氢甲烷含量,可以适当增大排废氢量以减少甲烷积累;在满足生产条件情况下,适当提高新氢纯度和降低反应温度;控制冷高分温度在40~50℃,以保持甲烷在冷高分液中一定的溶解度。 相似文献
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尿素合成塔爆炸原因分析 总被引:2,自引:0,他引:2
介绍了国内4家尿素厂水溶液全循环装置尿素合成塔发生的爆炸事故;分析了出料管爆炸原因;对塔内气相空间爆炸两个案例进行了较详细的分析。认为:无论是出料管爆炸还是气相空间爆炸均系化学爆炸。 相似文献
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直接冷凝器升气管堵塞的原因一是升气管口有冷热交替区 ,没有被循环EG捕集下来的低聚物冷凝在管口 ,不断增多 ,导致升气管口完全堵塞 ;二是在高负荷下进入冷凝器的蒸气量增大 ,雾沫夹带量也增多 ,夹带的低聚物不断冷却黏附在升气管口。在高负荷下 ,为保持正常运行 ,用热EG定时冲洗升气管口 ,可以避免直接冷凝器升气管的堵塞。 相似文献
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建立了以具有废气循环的回转干燥系统年总费用为目标函数的优化设计数学模型,在此基础上探讨了惯性权因子对微粒群算法性能的影响,并应用微粒群算法求解干燥器优化设计数学模型,对干燥器出口废气温度与循环比进行优化设计。结果表明,带动态非线性惯性因子的微粒群算法对求解多变量的干燥优化设计问题具有方法简单、所需微粒群规模小、收敛速度快等特点;采用部分废气循环并进行优化设计对干燥系统的节能具有十分重要的意义,对湿空气出口温度和废气循环比进行优化设计,其年总费用比无废气循环的常规设计节省18.2%,比循环比为0.2时的常规设计节省12.6%。 相似文献