Research On The Online Monitoring System Of Turbine Flow Meter

Turbine flow meter is an important measurement instrument in the natural gas trade.Its operating conditions are directly related to the fundamental interests of businessmen and users.Most flow meters will appear different problems in their effective lifetime.The problems make the measurement error increase and affect normal work.To solve these problems,this paper presents a online monitoring method and system for turbine flow meter.By analyzing the collected physical parameters’ information,the online monitoring system is implemented.The measurement accuracy and security of the turbine flow meter in its effective lifetime are ensured.Contents of this paper are as follows:Firstly,studies the structure,working principle,theoretical model and characteristic curve of the turbine flow meter are studied.Also analyzes the fluid temperature,fluid pressure and pressure loss influenced on turbine flow meter measurement precision in the pipe are analyzed.Based on this,discrimination method is obtained to determine whether the flow meter is operating properly through the relationship between flow rate and temperature,pressure,pressure loss.Then the system overall solution and the corresponding system software and hardware modules are designed.In the design of the system,flow standard test device is developed using a standard meter method to achieve the testing and calibration of online monitoring system.The hardware modules designs of the system,including controllers PLC,pulse processing circuit,is to realize the functions of the parameters of data collection.The software designs of the system,including interface design of PC software and software design of lower computer PLC,is to realize the final online monitoring of the system.Experimental research shows that the system error is less than 1%.The system can realize the functions of parameters monitoring,real-time data display and logging,fault prediction and alarm of the turbine flow meter.It can also be used to realize on-line monitoring of the turbine flow meter.