摘要
溴化锂制冷机组作为低温热阱,在石化企业得到了广泛应用。随着工况的改变,低温热系统操作条件及溴化锂制冷机组的运行性能将偏离最优运行条件,导致制冷效率降低。针对溴化锂制冷机组运行效果不佳的情况,提取实际运行数据,通过数据分析,并结合机理模型和线性回归模型,建立溴化锂制冷机组冷水预测模型,模拟结果能正确反映溴化锂制冷机组运行工况,模拟结果与实际结果吻合较好。基于模型,获得了制冷机组不同流量所对应的最优热媒水流量及上水温度,并提出了溴化锂制冷机组的优化运行方案。通过将热媒水流量从282t/h提高至318t/h,温度从80℃提高至90℃,冷水温度可从14.65℃降低至11.7℃。降低冷水温度后,有利于降低延迟焦化吸收塔吸收剂温度,从而降低干气C3含量,提高装置经济效益。
Lithium bromide refrigeration unit,as low temperature heat sink,has been widely used in petrochemical enterprises.With the change of working conditions,the operating conditions of low-temperature thermal system and the operating performance of lithium bromide refrigeration unit will deviate from the optimal oper-ating conditions,resulting in a decrease in refrigeration efficiency.In view of the poor operation effect of lithi-um bromide refrigeration unit,the actual operation data was extracted,and the cold water prediction model of lithium bromide refrigeration unit was established through data analysis based on mechanism model and linear regression model.The simulation results can correctly reflect the operating conditions of lithium bromide refrig-eration unit and agree well with the actual results.The optimal heat medium water flowrate and feed water temperature corresponding to different flowrates of the refrigeration unit were obtained based on the model,and the optimum operation scheme was put forward for lithium bromide refrigeration unit.By increasing the heat medium water flow rate from 282 t/h to 318 t/h and increasing the temperature from 80℃to 90℃,the cold water temperature can be reduced from 14.65℃to 11.7℃.After reducing the cold water temperature,the temperature of absorbent in the absorption tower of delayed coker can be reduced,thus reducing the C3 content of dry gas and improving the economic benefit of the unit.
作者
王海
Wang Hai(Petro-CyberWorks Information Technology Co.,Ltd.,Shanghai 200040)
出处
《中外能源》
CAS
2019年第9期82-85,共4页
Sino-Global Energy
关键词
溴化锂制冷机组
数据
分析
优化
lithium bromide refrigeration unit
data
analysis
optimizatio
