摘要
针对轻烃回收装置中脱丁烷塔的主要超压工况,包括回流中断、局部停电、全厂停电工况,进行了动态模拟。结果显示:事故工况发生初期影响压力上升速度的主要原因是空冷器的冷却负荷,而影响事故工况时最大泄放量的主要原因是泄放过程中塔底重沸器传热温差的变化。3种工况下动态模拟泄放量计算结果小于热平衡法计算泄放量和工艺包泄放量,但是得到的最高泄放温度要高于其他计算方法,在全厂停电工况时分别为136765,604945,319890 kg/h。动态模拟可以大大降低放空系统及火炬系统设计难度及投资,并且为使用高安全等级保护系统(HIPS)进一步降低泄放量的设计提供了重要设计依据。
Dynamic simulation is carried out for the most common overpressure scenarios of debutanizer column in light ends recovery units,such as reflux failure,partial power failure and total power failure.The dynamic simulation results show that at the beginning of the overpressure,the main reason affecting the speed of pressure rise rate is the cooling load of air coolers,and the main reason affecting the maximum relief load is the log mean temperature difference of reboiler at the bottom of tower during the relief process.In the above three situations,the results of dynamic simulation are less than those of heat balance method and process package data,but the highest relief temperature is higher than other calculation methods.Under the condition of total power filure,the results are 136,765 and 604,945 and 319,890 kg/h.The dynamic simulation can greatly reduce the difficulty and investment in the design of venting system and flare system,and provide an important design basis for the design of using HIPS(high safety protection system)to further reduce the relief load.
作者
杨晓凌
韩旭辉
张光黎
Yang Xiaoling;Han Xuhui;Zhang Guangli(SINOPEC Guangzhou Engineering Co.,Ltd.,Guangzhou,Guangdong 510620)
出处
《炼油技术与工程》
CAS
2020年第8期43-46,共4页
Petroleum Refinery Engineering
关键词
脱丁烷塔
超压工况
动态模拟
塔顶压力
安全阀泄放量
泄放温度
debutanizer
overpressure
dynamic simulation
column top pressure
relief load of safety valve
relief temperature
