燃气轮机-加热炉联合系统集成优化研究

RESEARCH ON THE INTEGRATED OPTIMIZING COMBINED SYSTEM OF GAS TURBINE AND HEATER

通过对燃气轮机-加热炉联合系统进行集成建模,提出了一定加热炉约束条件(包括工艺加热目标约束和主要设备参数约束)下的联合系统集成优化方法。通过该方法可以计算出联合系统的最佳燃气轮机配置方案和最佳操作方案;并能对加热炉系统进行核算,提出为适应联合系统优化操作需要进行加热炉局部调整的建议;同时,还能对系统进行分析,说明改进前后的损分布以及系统效率。国内某12Mt/a炼油厂常压蒸馏加热炉的工业应用结果表明该方法是可行的,指出如果为该加热炉配置一个出功13.43MW的燃气轮机,联合系统多耗燃料的发电效率将达到55%,系统将新增效益1 368万元/a。

By modeling the combined system of gas turbine and heater,a method focusing on integrated optimization of the combined system is proposed in this paper.To an existing heater with a stipulated process heating duty,this method can be helpful for choosing the best size of gas turbine and telling the optimal operation scheme of the combined system.At the same time,detailed calculation of the heating system can be carried out to give suggestions for adjusting heater to cope with the optimal operation of the combined system.This method can also provide exergy analysis to discover the exergy loss distribution and exergy efficiency of the system.Finally,a case study on heater of an atmospheric distillation unit with a processing capacity of 12 Mt/a is performed to validate the feasibility of this method,and the result is positive.In this case,if a gas turbine with an output power of 13.43 MW is combined with the heater,the efficiency of power generation by the additional fuel consumption of the system reaches as high as 55%,and comprehensive incremental benefits of 13.68 million RMB per year could be gained.