共查询到18条相似文献,搜索用时 140 毫秒
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聚丙烯环管反应器的模拟 总被引:2,自引:0,他引:2
以荆门石化总厂7万t/a聚丙烯装置为基础,介绍了环管反应器的特点,分析了物料在环管反应器的流动特性,建立了符合其性能的数学模型。通过对模型的求解,得到了固含率,单体浓度,反应器温度,冷却水温度,聚合反应速率,链转移反应速率和催化剂失活速率等参数与环管反应器管长度的关系,为聚丙烯环管反应器的优化操作提供了理论依据。 相似文献
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Spheripol聚丙烯工艺生产过程中最大的风险因素之一是反应器温度过高,造成反应器内聚合物暴聚。因此,控制环管反应器的温度控制对Spheripol聚丙烯装置安全生产尤为重要。本文重点讨论影响环管反应器温度的因素,及环管反应器温度波动如何及时判断原因和采取相应调整措施。 相似文献
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聚丙烯环管反应器的动力学特征 总被引:9,自引:0,他引:9
讨论了聚丙烯环管反应器内聚丙烯反应机理,反应速率;以齐鲁石化公司塑料厂的实际运行数据为基础,建立了物热衡算数学模型;并通过对模型求解,得到了反应器内的聚合速率,固含率在不同产量下随温度的变化规律,通过分析得出其温度的最佳操作域。 相似文献
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聚丙烯环管反应器的模拟与参数在反应器内的分布 总被引:11,自引:0,他引:11
本文以实际运行的聚丙烯环管反应器为基础,分析了物料在反应器内的流动特性,建立了数学模型。通过对模型的求解,得到了固含率、物料浓度、床层温度和冷却水温度等参数在反应器内沿物料流动方向上的分布。计算结果与实际数据的拟合较好,为聚丙烯反应器的优化操作提供了依据。 相似文献
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聚丙烯轴流泵作为聚丙烯装置环管反应器的一部分,是环管法聚丙烯生产技术的核心设备.轴流泵作为反应器介质的循环泵,在实际运行过程中可能会发生运行不稳定的情况,从而导致轴功率波动.因此,分析轴流泵的内部流场特性,研究其内部流动规律,使反应介质充分混合,获得均布的物料和温度、避免生成的聚合物发生沉淀,对轴流泵长期安全稳定运行有... 相似文献
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以工业装置为背景,建立了聚丙烯环形反应器数学模型,经模拟计算,研究了聚丙烯环形反应器的工艺特性,工艺参数对反应器操作状态的影响,并对反应器的可操作域作了分析。 相似文献
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Ahmad Shamiri Mohamed azlan Hussain Farouq sabri Mjalli Navid Mostoufi Seyedahmad Hajimolana 《中国化学工程学报》2013,21(9):1015-1029
A two-phase dynamic model, describing gas phase propylene polymerization in a fluidized bed reactor, was used to explore the dynamic behavior and process control of the polypropylene production rate and reactor temperature. The open loop analysis revealed the nonlinear behavior of the polypropylene fluidized bed reactor, jus- tifying the use of an advanced control algorithm for efficient control of the process variables. In this case, a central- ized model predictive control (MPC) technique was implemented to control the polypropylene production rate and reactor temperature by manipulating the catalyst feed rate and cooling water flow rate respectively. The corre- sponding MPC controller was able to track changes in the setpoint smoothly for the reactor temperature and pro- duction rate while the setpoint tracking of the conventional proportional-integral (PI) controller was oscillatory with overshoots and obvious interaction between the reactor temperature and production rate loops. The MPC was able to produce controller moves which not only were well within the specified input constraints for both control vari- ables, but also non-aggressive and sufficiently smooth for practical implementations. Furthermore, the closed loop dynamic simulations indicated that the speed of rejecting the process disturbances for the MPC controller were also acceotable for both controlled variables. 相似文献
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针对催化裂化反应-再生系统在提升管反应温度开环和闭环控制条件下的输出与输入多稳态问题,分析了烧焦罐式高效再生催化裂化反应-再生系统在两种条件下随着CO助燃剂添加量变化时的多稳态分布。在反应温度开环条件下,因再生温度与反应温度的耦合程度较低,使系统移热曲线呈单调递增,导致了系统出现3个稳态操作点。在反应温度闭环控制条件下,提升管反应器和再生器间热反馈机制发生改变,由于再生剂循环量可以作为额外的自由度对再生温度和反应温度之差进行补偿,再生器和提升管反应器的耦合程度增强,使得系统只会在助燃剂添加量极低时才会出现多个稳态点,而在基准操作条件下只有一个稳态点,规避了系统在提升管反应温度开环时的多个稳态点的问题。 相似文献
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The high solids emulsion copolymerization of vinyl acetate and veova 10 was studied in a continuous loop reactor and in a continuous stirred tank reactor (CSTR) in an attempt to elucidate the similarities and differences between these reactors. Reactions were carried out under comparable conditions, namely, similar macromixing and the same feed composition and space time. The behavior of both reactors was almost the same when the heat generation rate was low; otherwise, thermal runaway occurred in the CSTR whereas the loop reactor temperature was easily controlled. © 1995 John Wiley & Sons, Inc. 相似文献
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Pablo MarínSalvador Ordóñez Fernando V. Díez 《Computers & Chemical Engineering》2011,35(11):2326-2333
This article explores the use of computational fluid dynamics (CFD) modelling for designing an oven which enables the adiabatic operation of a chemical reactor at bench-scale. For accomplishing this scope, the oven consists of electrical heating elements, air circulation system and a control loop that uses the temperature inside the reactor as set-point for the reactor wall temperature. Depending on the spatial configuration of the air flow and the heating elements, as well as the air flow rate, different temperature profiles within a given oven section are obtained, being appropriate those leading to uniform reactor wall temperatures and fast dynamic response. The use of CFD allows, by obtaining temperature maps within the oven, the selection of appropriate configurations. The optimal configuration adopted has been experimentally validated in a lab-scale adiabatic reactor working with both particulated and monolithic catalyst beds. 相似文献