Self-optimizing control and safety assessment to achieve economic and safe operation for oxy-fuel combustion boiler island systems

被引:4
|
作者
Jin, Bo [1 ]
Yao, Wenxing [1 ]
Liu, Kaile [1 ]
Lu, Shijian [2 ,3 ]
Luo, Xiao [1 ]
Liang, Zhiwu [1 ]
机构
[1] Hunan Univ, Coll Chem & Chem Engn, Joint Int Ctr Capture & Storage iCCS CO2, Adv Catalyt Engn Res Ctr Minist Educ,Provincial Hu, Lushan Nan Rd 1, Changsha 410082, Peoples R China
[2] China Univ Min & Technol, Low Carbon Energy Inst, Xuzhou 221008, Peoples R China
[3] Sinopec Petr Engn Corp, Jinan Rd 49, Dongying, Peoples R China
基金
中国国家自然科学基金;
关键词
CO(2 )capture; Oxy-fuel combustion; Self-optimizing control; Dynamic behavior; Safety analysis; CONTROL-STRUCTURE DESIGN; MODE SWITCHING STRATEGY; DYNAMIC EXERGY METHOD; AIR SEPARATION UNIT; PURIFICATION UNIT; CO2; COMPRESSION; PLANTWIDE CONTROL; SIMULATION; OPTIMIZATION; TECHNOLOGY;
D O I
10.1016/j.apenergy.2022.119397
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Oxy-fuel combustion is a promising carbon capture, utilization and storage (CCUS) method to reduce CO2 emissions in power plants. However, it faces with the issues of high energy-cost penalties and operating risks. In this work, a combined control optimization and safety analysis are applied to optimize the control and operation of oxy-fuel combustion boiler island system. To maximize the specific operating profit, a new self-optimizing control structure is proposed to optimize the selection of desirable controlled variables. This control structure shows a robust controllability and maintains a maximum specific operating profit around 28.7 $/t(CO2). Moreover, the operating profit exhibits an opposite tendency to load change, increases with the increasing oxygen supply purity and keeps constant in presence of air leakage. The failure of oxygen concentration controller causes some fluctuations on the dynamic behavior of operating parameters at water-steam and flue gas sides. The loss of oxygen flow control loop leads to a larger effect on the dynamic responses of operating parameters than the fault of oxygen concentration control loop during load change and oxygen supply purity change operating scenarios. The results provide a new route to improve control reliabilities, reduce operating costs and guide safe operations for oxy-fuel combustion systems.
引用
收藏
页数:15
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