先进控制技术在延迟焦化装置的应用

The Application of Advanced Process Control in Delayed Coking Units

先进控制技术采用科学、先进的控制理论和控制方法,以工艺过程分析和数学模型计算为核心,以工厂控制网络和管理网络为信息载体,充分发挥DCS和常规控制系统的潜力,保障生产装置始终运转在最佳状态,通过多变量协调和约束控制降低装置能耗,卡边操作,以获取最大的经济利益。洛阳石化延迟焦化装置投用先进控制系统后,加热炉氧含量、负压、排烟温度以及其他关键操作参数控制更加平稳,热效率由92.43%提高到92.63%,有效降低了装置能耗;分馏塔侧线液体产物的切割更加清晰,提高了产品纯度;吸收稳定系统控制更加优化合理,干气中C_31及以上组分含量降低0.6%,提高了液化石油气(L.PG)的收率,实时优化液气比,节能效果明显。控制器性能较好,在有效提高生产过程控制精度的同时,基本实现了提高装置运行平稳率、降低操作劳动强度、提高目的产品收率和节能降耗的控制目标。

Advanced control technology uses scientific and advanced control theories and control methods and uses process analysis and mathematical model calculations as its core and factory control and management networks as the information carrier.It gives full play to the potential of DCS and conventional control sys- tems,ensures a production unit is always working in its best condition,and reduces a unit＇s energy use to achieve optimum constraint control through multivariable coordination and constrained control,with the aim of maximizing economic returns.After Sinopec Luoyang Company introduced an advanced control system in its delayed coking unit,oxygen content of the heating furnace,negative pressure,exhaust temperature and other key operating parameters of the unit have become more stable and heat efficiency has risen to 92.63% from 92.43% ,effectively reducing the energy consumption-of the unit.The cutting for side-stream liquid products from the fractionating column is clearer and the purity of products is higher.The control of the absorption and stabilization system has been further optimized,the contents of Ca and higher components in dry gas have dropped by 0.6%,the yield of LPG has increased and the liquid-gas ratio can be optimized in real time,producing good energy saving results.With good controller performance,the advanced control system has effectively increased the accuracy of control of the production process and helped basically achieve the objec- tives of increasing the stability of operation of the unit,reducing operator＇s work load,increasing the yields of target products and saving energy.