Simulation Study on Energy-saving Parameters for Liquid Level Control in Tank
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 con-trol 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 opera-tion.A lower computer PID simulation program is built by using STEP7 V5.5 software,and joint sim-ulation is performed with the two software.Simulation results show that under the same working condi-tion(1 000 m3 buffer tank,diameter 11.5 m,height 10.725 m,sewage export pump displacement 85 m3/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 es-timation 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 2.628×104 kWh per year.According to the electricity price of 0.54 yuan/kWh,each pump can save the operation cost 14 200 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.
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