Abstract: 　Due to large fluctuation on average COT temperature in two ethylene cracking furnace named EF⁃111M and EF⁃111N of No.1 petrochemical plant of PetroChina Daqing petrochemical company, an advanced control system of average COT temperature for the furnaces is designed and developed. Firstly, based on the existing problem of conventional control strategy, the advanced control strategy of average COT is designed. In addition, the non⁃minimal state space model predictive control (NMSSMPC) is used as the design of the average COT temperature controller. Finally, the developed advanced control system of average COT temperature is applied to M# and N# furnace of Daqing petrochemical company. Compared with the conventional control strategy, standard deviation between measurement and set⁃point of COT temperature in M# furnace decreases from 1.24 ℃ to 0.57 ℃ with the advanced control strategy. And the standard deviation of average COT temperature in N# furnace decreases from 1.84 ℃ to 0.72 ℃. The standard deviation of average COT reduces by 54.03% and 60.87% for M# and N# furnace, respectively. It can achieve the expected goal to remain average COT within 1 ℃.

Key words: Average COT, Predictive control, Ethylene cracking furnace, Advanced control, MPC

摘要： 　针对大庆石化化工一厂乙烯裂解炉(EF-111M和EF-111N炉)平均COT温度波动大的情况，设计和开发一套乙烯裂解炉平均COT温度先进控制系统。首先，根据原有常规控制方案存在的问题，设计了裂解炉平均COT温度先进控制方案。其次，将非最小状态模型预测控制方法(NMSSMPC)用于平均COT温度控制器的设计。最后，将所开发的乙烯裂解炉平均COT温度先进控制系统应用到大庆石化M#和N#裂解炉中。与原有常规控制方案进行对比，M#炉和N#炉平均COT温度测量值与设定值间的标准偏差分别由投用前的1.24 ℃和1.84 ℃下降到投用后的0.57 ℃和0.72 ℃，平均COT温度标准偏差分别降低了54.03%和60.87%，达到了标准偏差控制在1 ℃以内的预定目标。

关键词: 平均COT温度, 预测控制, 乙烯裂解炉, 先进控控制, MPC