Design And Research On The Oil Tank Farm's Monitoring System

It is very important to carry on effective control in the oil tank to promote the level of management,decrease the workers' labor intensity,improve the working condition and avoid the occurrence of accident,etc.In recent years,along with the increasing of the scale of oil tank area and tank quantities,the higher requirement is needed for the storage,loading and unloading,especially for the automation management.On the other hand,along with the development of automation control theory,the computer application technology and the communication technology,as well as the successful application of industry computer supervisory systems in industrial production process,the automation instruments are developing toward the digital and intelligent,which makes process monitoring perfected gradually.The PLC,DCS,FCS and other industrial control networks are formed,and provide technology safeguard for the development of automation in oil tank area monitoring system.The appearance of DCS leads to the reform of structure in traditional control system.The development of DCS will take the aim that is centralized display, operation,management and distributed control,and it will develop toward the CIMS, computer integrated process system and FCS.Ethernet as a LAN technology which is applied widely,has more and more application in the field of industrial automation and the process control.It is a hotspot to realize remote monitoring by Ethernet.This paper,which is combined the technology of fieldbus and industrial Ethernet, analyses the actual situation in oil tank,and designs the monitoring system by using the distributed control structure,which has been used in the area of oil tank successfully.Firstly,this paper analyses the network technology in the monitoring system. Through comparing the FCS,DCS and Ethernet,a proper scheme is adopted.This paper also introduces the technology of defending burst.Secondly,this paper introduces the basic instance and analyses the technological process to ensure the requirements and the principle of this system.PLC control system and liquid level monitoring system are designed.MOX controller is used to design the PLC control system.In this system,the capability of defending burst and the redundancy are considered.The EMERSON's productions are adopted to design the liquid level monitoring system.All the equipments are intrinsic safety to ensure the safety of the system.Finally,this paper sets the communication between the PLC control system and radar liquid level monitoring system,as well as the communication between the PLC control system and the host computer.Control program based on the requirement of the local task and the technological process is designed to control the local equipments.The result of practical operation proves the correctness and effectiveness of this system.