储罐液位控制节能参数仿真研究  

Simulation Study on Energy-saving Parameters for Liquid Level Control in Tank

作　　者：刘虎成[1] LIU Hucheng(Daqing Oilfield Tianyu Engineering Design Co.,Ltd.)

机构地区：[1]大庆油田天宇工程设计有限责任公司

出　　处：《油气田地面工程》2024年第5期17-22,共6页Oil-Gas Field Surface Engineering

摘　　要：在石油化工行业生产过程中,储罐作为一种最普通的设备被广泛应用。为保证储罐安全,储罐液位须限定在一定范围内,液位控制达到稳态的时间,直接关系到系统的稳定性及节能性。针对如何精准确定控制参数这一问题,采用仿真手段对储罐的液位控制进行研究,找到提高液位控制的节能参数,利用WINCC 7.3上位机编程软件搭建上位机工艺流程,在模块中插入C脚本语言,达到与实际运行一致的工艺参数,在STEP7 V5.5软件搭建下位机PID仿真程序,两个软件做联合仿真。仿真结果表明:在同等工况下(1000 m^(3)缓冲罐,直径11.5 m,高度10.725 m,污水外输泵排量85 m^(3)/h),比例值采用10产生的液位变化曲线达到稳态的时间与比例值采用5液位变化曲线达到稳态的时间相比缩短4 min;初步估算,每天每个泵将减少高频运行时间约为2 h,如果按照72 kW功率计算,每台泵每天节能约为72 kWh,每年节能约为2.628×10^(4)kWh,按照0.54元/kWh电价计算,每台泵每年节约运行费用1.42万元。在油田实际生产运行中,优化控制参数能起到较好的节能降耗作用,产生良好的经济效益。In the production process of the petrochemical industry,the storage tank is widely used as one of the most common equipment.To ensure the safety of the storage tank,the liquid level in the storage tank should be limited to a certain range.The time for the liquid level control to reach steady state conditions is directly related to the stability and energy efficiency of the system.To address the issue of accurately determining control parameters,simulation methods are used to study the liquid level control of storage tanks,and energy-saving parameters for improving liquid level control are identified.WINCC 7.3 upper computer programming software is used to build the upper computer process flow,C script language is inserted into the module to achieve the same process parameters as the actual operation.A lower computer PID simulation program is built by using STEP7 V5.5 software,and joint simulation is performed with the two software.Simulation results show that under the same working condition(1000 m^(3) buffer tank,diameter 11.5 m,height 10.725 m,sewage export pump displacement 85 m^(3)/h),the time for the liquid level change curve generated by using a proportional value of 10 to reach steady state is shortened by 4 minutes compared to using a proportional value of 5.Preliminary estimation shows that each pump can reduce high-frequency operating time by approximately 2 hours per day.If calculated based on 72 kW power,each pump can save approximately 72 kWh per day,and 2.628×10^(4) kWh per year.According to the electricity price of 0.54 yuan/kWh,each pump can save the operation cost 14200 yuan per year.In the actual production and operation of oilfields,optimizing control parameters can play a good role in energy-saving and consumption reduction,and produce good economic benefits.

关 键 词：储罐 PID控制 液位 节能 仿真 

分 类 号：TE972[石油与天然气工程—石油机械设备]