Safety analysis of FCCU reaction-regeneration system underabnormal conditions

doi:10.11949/j.issn.0438-1157.20150866

Abstract

Abstract:

Fluid catalytic cracking unit (FCCU) is one of the key processes in modern petroleum refinery, where reaction-regeneration system is the core technology. Researches about reaction-regeneration system are very active in domestic and abroad, but mainly focusing on the influences of process parameters on reactive process. Reaction-regeneration system is a complex system due to its multivariable, time-varying and nonlinear characteristics, and thus the modeling of the system of complex kinetics reactions should be studied. A dynamic model is put forward to study the operating characteristics of system. Based on the equations of material balance, energy balance, general mechanism mathematical models are established. With field data and MATLAB software to solve the kinetic parameters, a user-friendly simulation system is developed and a steady-state production is achieved. With the established simulation system as the platform, four frequently encountered abnormal conditions are simulated and their influences on some important parameters are obtained. These parameters are plotted into curves and fitted into formulas and the theory of just-in-time is applied to the dynamic nonlinear analysis.
Results show that the study of dynamic security analysis of abnormal conditions in the reaction-regeneration system is effective. The simulation of process is realistic in observing changes caused by abnormal operating conditions. When the changes of important parameters are known, the theory of JIT can infer certain abnormal conditions within a certain range, and draw the changes of the specific parameters during this abnormal condition. The processes running in different states are identified effectively. The accuracy and validity of the mathematical model are tested. This paper provides a new method for the identification of dynamic systems.

Key words: FCCU, dynamic simulation, JIT, safety analysis

摘要：

石油化工行业因生产规模大、生产工艺复杂、原料多易燃易爆,所以具有高危险性。对石化行业进行安全分析是保证安全生产的重要途径。基于石油催化裂化(FCCU)反再系统动态模型实现了再生催化剂失活、再生器稀相尾燃、反应器催化剂跑损3种异常工况的动态模拟。将工商管理模式的及时生产方式(just-in-time,JIT)应用于反再系统的安全分析,建立了上述4种异常工况的简化模型,实现了异常工况的及时识别。该方法能够有效地辨识不同状态下过程的运行规律,具有一定的可行性和优势,可以为实际生产安全提供准确、可靠的指导。将JIT理论用于动态过程的非线性分析,希望为动态系统的辨识提供一种新思路。

关键词: FCCU, 动态模拟, JIT, 安全分析

CLC Number:

TE624

JIN Manman, TIAN Wende, ZHANG Junmei. Safety analysis of FCCU reaction-regeneration system underabnormal conditions[J]. CIESC Journal, 2015, 66(9): 3649-3653.

靳满满, 田文德, 张俊梅. FCCU反再系统异常工况的安全分析[J]. 化工学报, 2015, 66(9): 3649-3653.

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