共查询到19条相似文献,搜索用时 390 毫秒
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蒋跃 《化工自动化及仪表》2001,28(3):25-28
经过对各厂催化裂化四机组调研,吸取了各四机组用户运行的经验,总结分析了天炼催化裂化能量回收四机组的机组启动,运行,联锁,保护控制的方案及措施。 相似文献
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提出了催化装置三机组(主风机+烟机+电动机/发电机)烟机效率的一种计算方法,并对某炼厂3.0×106t/a催化裂化装置烟机进行了计算与分析。催化装置设置烟机的目的是回收烟气能量,而烟机效率表示了烟机的工作状态,装置运行中受到结垢与催化剂磨损的影响。 相似文献
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本文介绍了呼和浩特炼油厂60×10 ̄4T/a催化裂化装置烟气能量回收机组的机组设计、安装、运转情况,分析了机组重大损坏事故的原因,并简述了机组修复处理过程,对全部国产化四机组的设计改进、运行管理均提出了有益的意见。 相似文献
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针对鲁奇合成氨装置运转率低的现状,建立了鲁奇合成氨系统故障树模型.运用实际运行故障统计数据,对系统工艺失常状态进行了定性及定量分析,利用定量计算求解系统的失效概率,找出了系统的薄弱环节.并进行了共因失效分析,使得分析结果更精确,更接近实际情况. 相似文献
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<正> 广州石油化工总厂从美国英格索兰公司引进的催化裂化烟气能量回收机组投运成功。该机组采用烟气轮机一轴流空气压缩机—汽轮机—齿轮箱—电动机/发电机同轴机组,国内首创具,有八十年代的国际先进水 相似文献
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《Fuel》2006,85(5-6):849-859
The FCC dynamics has been studied to determine the effect of operating conditions on multiplicity of steady states. The proposed model is capable to analyze several dynamic features to characterize the FCC process. Three combustion modes are analyzed: Partial combustion, total combustion and transition mode. At least three steady states have been determined in both partial and complete combustion modes. Furthermore, it is established in this paper that operating conditions are incapable to change the number of steady states. It is believed that a similar analysis should be applied to identify the effect on the multiplicity of physical parameters such as oxidation rates. 相似文献
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Joana L. Fernandes Nuno M.C. Oliveira Fernando Ramôa Ribeiro 《Chemical engineering science》2007,62(22):6308-6322
The possibility of existence of multiple steady states in fluid catalytic cracking (FCC) units has a major impact in the supervision of these systems. The origins of these behaviours are usually due to the exothermicity of the catalyst regeneration reactions and to the strong interactions between the reactor and the regenerator system.Prior work has focused on modelling and control problems of different operating FCC units. However, none of these studies have considered a high-efficiency regenerator. This paper presents an analysis of the existence of output and input multiple steady states in an UOP FCC unit with a high-efficiency regenerator.The influence of unit disturbances and model uncertainties, such as coke composition and cracking enthalpy, in the output multiplicity, was studied and the results show that the high-efficiency regenerator exhibits at least three multiple output steady states and a maximum of five output steady states, in the operating range considered. Moreover, the state multiplicity analysis revealed that input multiplicity can be present in this FCC unit, depending on the choice of the control structure, and that operating the unit in full combustion mode can prevent instabilities due to input and output multiplicities. Therefore, these results can be used to guide the design of the most appropriate control structures in industrial applications. For the FCC unit with high-efficiency regenerator the most appropriate control structure corresponds to the control of the riser reactor temperature and the oxygen level in the flue gas, with the catalyst circulation rate and the combustion air flow rate, respectively. 相似文献
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针对催化汽油辅助提升管改质降烯烃技术(ARFCC)存在能耗偏高的特点,采用"三环节"模型和经济理论对辅助系统的用能状况进行了研究,提出了以优化的辅助分馏塔热量为热源,粗汽油为主要热阱的换热网络,以最大限度地提高辅助分馏塔能量的利用效率,实现粗汽油气相进料的汽油改质过程的能量优化。研究表明:通过降低辅助提升管油剂接触温差,将辅助分馏系统的较低品质热量转换成等量的反再系统高品质热量,可达到催化裂化装置的能量升级利用;并使油剂混合过程中的损降低85%;回收环节的回收率从44%提高到57%,从而降低了汽油降烯烃改质过程的能耗。 相似文献
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针对聚乙烯装置扩能改造后排放气回收系统运行不稳定导致物耗、能耗增加的问题,建立ASPEN流程拟合模型。通过模拟计算,找到了该系统关键部位低压冷凝罐的最佳操作温度,并排除了回收压缩机“带液”操作的可能性。利用模拟计算结果,在实际操作中提高了低压冷凝罐操作温度,将原设计的低、高压冷凝段共同回收冷凝液改为仅高压段回收,停运了回收系统中1台低压回收泵和1台低压段冷冻机,解决了低压回收泵运行不稳定的问题,增加了冷凝液回收量,降低了装置的能耗、物耗。 相似文献
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炼油厂中流化催化裂化(FCC)装置催化剂跑损的故障原因分析多数来自现场工程师,在故障机理方面少有报道。为了解决这一问题,本文利用故障树分析方法(FTA),研究FCC装置催化剂跑损机制。采用催化剂跑损为顶事件,结合跑损途径和跑损机理,确定FCC装置故障、操作工艺异常和催化剂颗粒物性3个因素作为中间事件,并通过逐层向下深入分析,确定诸如翼阀磨损等21个因素作为底事件,建立催化剂跑损故障树模型。根据FCC装置故障树风险分析,得到任何一个底事件出现都有可能导致顶事件发生,且对FCC装置催化剂跑损的贡献度相同。研究结果表明:利用FTA方法可以更深层次了解装置跑剂原因,对考察FCC装置催化剂跑损机理具有指导意义,并提出了相应的故障判定流程和跑剂预防措施。 相似文献