孔板差压噪声的分析及其应用

Analysis and Application of Orifice Differential Pressure Noise

差压噪声即差压实时测量值与真实值或测量平均值之差,传统的测量将噪声视为对被测量的干扰而设法消除或减小之,而现代测量技术则将噪声视作被测量的信息载体,在两相流参数测量中有着重要的意义。采用Rosemount3051S智能差压变送器和NI4350数据采集卡,并编制LabVIEW数据采集程序,精确地取得了水与气-水两相流通过孔板时的差压噪声,并进行了波形与频谱的对比分析。研究结果表明,利用孔板差压噪声及其频谱可有效地判断差压变送器取压管堵塞故障。

Differential pressure noise is the difference between the real-time measurement differential pressure value and that of the truth or the average of the measurements.The traditional measurement takes the noise as the interference of the quantity being measured,and tries to eliminate or reduce it.While the modern measurement technique takes it as the information carrier of the measured quantity and it is most important in quantity measurement of two-phase flow.In this paper,the Rosemont 3051S intelligent differential pressure transmitter and the NI4350 data acquisition board were used to get the differential pressure noise through the LabVIEW data acquisition procedures when the water and gas-water two-phase flow passed through the orifice.The comparative analyses of the time-domain and spectrum of the differential pressure noise in water and gas-water two-phase flow were done.Study results show that the transmitter＇s blockage fault can be effectively judged by the orifice plate differential pressure noise or its spectrum.