Uniform temperature control on feed heaters by distributed deviations

doi:10.11949/j.issn.0438-1157.20160863

Abstract

Abstract:

A novel design method was proposed on the basis of distributed deviation for consensus pass temperature control on industrial feed heaters, in order to overcome limitations of centralized balance control schemes on pass temperatures. In the method, only temperature deviations of adjacent passes were used as input in control algorithm to achieve uniform temperature across all passes while maintaining constant total feed flow. Compared to the traditional centralized balance control, this distributed deviation control scheme by using only temperature information of adjacent passes was more cost effective especially for cases with large number of passes. Sufficient conditions for the distributed deviation controller on industrial feed heaters with time delay and random disturbance were derived by Lyapunov function. The simulation results illustrated that the new controller design method was effective and the distributed deviation control scheme was feasible even for a class of industrial feed heaters with mismatched models.

Key words: uniformity, distributed deviation, consensus control, equation of state, dynamic simulation

摘要：

针对现有集中式温度支路平衡控制存在的问题，提出基于分布式偏差的支路温度一致性控制方案：仅利用相邻支路的温度信息，将各支路与相邻支路的温度偏差作为控制输入，使加热炉所有支路的温度达到一致的同时，确保调节过程中总进料流量不变。由于仅利用了相邻支路的温度信息，使得所提分布式偏差控制方案在大规模支路情形下更显优势。最后仿真实例表明了该分布式控制方案的有效性与可行性。

关键词: 平衡, 分布式偏差, 一致控制, 状态方程, 动态仿真

CLC Number:

TQ028.8

MIN Yang, LUAN Xiaoli, LIU Fei. Uniform temperature control on feed heaters by distributed deviations[J]. CIESC Journal, 2016, 67(12): 5148-5154.

闵鸯, 栾小丽, 刘飞. 基于分布式偏差的加热炉支路温度一致控制[J]. 化工学报, 2016, 67(12): 5148-5154.

References 20

[1]	WANG X X, ZHENG D Z. Difference control of parallel streams temperatures[J]. Journal of Process Control, 2005, 15(5):531-536.
[2]	李嗣福, 吴福明, 陈红, 等. 炼油加热炉进料支管出口温度平衡控制[J]. 信息与控制, 1994, 23(4):243-246. LI S F, WU F M, CHEN H, et al. Refinery furnace feed-branches outlet temperatures balancing control[J]. Information and Control, 1994, 23(4):243-246.
[3]	WANG X X, ZHENG D Z. Generalized difference control of parallel streams temperatures[J]. Journal of Process Control, 2006, 16(5):535-543.
[4]	WANG X X, ZHENG D Z. Load balancing control of furnace with multiple parallel passes[J]. Control Engineering Practice, 2007, 15(5):521-531.
[5]	吴洁芸, 雷卫良, 周娓, 等. 平均值法在加热炉支路平衡控制上的实现[J]. 化工自动化及仪表, 2014, 41(10):1189-1191. WU J Y, LEI W L, ZHOU W, et al. Averaging method to implement balance control of heating furnace branches[J]. Control and Instruments in Chemical Industry, 2014, 41(10):1189-1191.
[6]	WANG X X, ZHENG D Z. Generalized switched server systems and task balancing[C]//COUNCIL A C C. Proceedings of the American Control Conference. Minneapolis, Minnesota, USA:IEEE, 2006:680-685.
[7]	WANG X X. On switching policies for generalized switched server systems[C]//BE IEEE. Proceedings of the 27th Chinese Control Conference. Kunming, China:IEEE, 2008:671-677.
[8]	WANG X X, ZHENG D Z, ZHANG J Q, et al. Switching difference control of parallel streams temperatures[J]. IFAC Proceedings Volumes, 2008:41(2):15421-15426.
[9]	WANG X X. Pass balancing switching control of a four-passes furnace system[J]. IFAC Proceedings Volumes, 2011, 44(1):12078-12083.
[10]	牟金善, 王昕, 王振雷, 等. 乙烯裂解炉炉管出口温度控制系统设计及应用[J]. 计算机与应用化学, 2012, 29(1):90-94. MU J S, WANG X, WANG Z L, et al. Design and application of cot control system of ethylene cracking furnace[J]. Computers and Applied Chemistry, 2012, 29(1):90-94.
[11]	ABILOV A G, ZEYBEK Z, TUZUNALP O, et al. Fuzzy temperature control of industrial refineries furnaces through combined feedforward/feedback multivariable cascade systems[J]. Chemical Engineering & Processing, 2002, 41(1):87-98.
[12]	吕亚妮, 肖健, 杜志强. 化工用加热炉出口温度控制和热平衡监测系统[J]. 化工自动化及仪表, 2011, 38(4):454-456. LÜ Y N, XIAO J, DU Z Q. Outlet temperature control and thermal equilibrium monitoring system for chemical heating furnace[J]. Control and Instruments in Chemical Industry, 2011, 38(4):454-456.
[13]	蒋爱平, 韩志刚, 韩丹. 无模型控制系统在加热炉温度控制上的应用[J]. 控制工程, 2004, 11(5):388-391. JIANG A P, HAN Z G, HAN D. Application of model free control systems to temperature control of heat furnace[J]. Control Engineering of China, 2004, 11(5):388-391.
[14]	李平, 李奇安, 雷荣孝,等. 乙烯裂解炉先进控制系统开发与应用[J]. 化工学报, 2011,62(8):2216-2220. LI P, LI Q A, LEI R X, et al. Development and application of advanced process control system for ethylene cracking heaters[J]. CIESC Journal, 2011,62(8):2216-2220.
[15]	MOGHIMIPOUR E, AGHEL N, ZAREI M A, et al. Nonlinear adaptive predictive functional control based on the Takagi-Sugeno model for average cracking outlet temperature of the ethylene cracking furnace[J]. Industrial & Engineering Chemistry Research, 2015, 54(6):1849-1860.
[16]	ALBERTO L. Autotuning process controller with improved load disturbance rejection[J]. Journal of Process Control, 2005, 15(2):223-234.
[17]	WANG X X. Temperature uniformity control of a furnace system with multiple parallel passes using fuzzy difference control technique[C]//Intelligent Control and Automation, 2008. WCICA 2008. 7th World Congress on. IEEE, 2008:794-799.
[18]	李世原, 黄鑫. 基于广义预测控制的常压加热炉先进控制技术应用研究[J]. 计算机与应用化学, 2013, 30(8):864-866. LI S Y, HUANG X. A generalized predictive control-based application research of advanced process control for atmospheric furnace[J]. Computers and Applied Chemistry, 2013, 30(8):864-866.
[19]	ZHANG W Y, HUANG D X, WANG Y D, et al. Adaptive state feedback predictive control and expert control for a delayed coking furnace[J]. Chinese Journal of Chemical Engineering, 2008, 16(4):590-598.
[20]	亓鲁刚, 吕文祥, 高小永,等. 多液位加热炉复合系统的协调控制[J]. 化工学报, 2016, 67(3):690-694. QI L G, LÜ W X, GAO X Y, et al. Coordinated control of multiple liquid levels and furnace composite system[J]. CIESC Journal, 2016, 67(3):690-694.