Gas Ultrasonic Flow Meter Method

The gas ultrasonic flowmeter method has a history of measuring fluid flow with acoustic measurement technology for about 40 years, especially since the 1990s, with the development of high-speed digital signal processing technology and advanced piezoelectric ceramic technology, the use of gas ultrasonic flowmeter A breakthrough has been made in the technology for measuring the flow of natural gas. Because the high-tech gas ultrasonic flowmeter has many advantages such as wide measurement range, high measurement accuracy, no pressure loss and moving parts, and low installation and use costs, it has been used by hundreds of users in Europe, America and other countries for natural gas trade measurement. . So far, the governments of 12 countries including the United States, the Netherlands, the United Kingdom, and Germany have approved gas ultrasonic flowmeters as legal measuring instruments. The American Gas Association has issued 8(^8chi6-130^^0.9 'Measuring Natural Gas Flow with Multi-channel Ultrasonic Flowmeter' in June 1998. Our country mainly refers to this report, and refers to 130/1^12765 'Measuring Fluid Flow in Closed Pipelines with Time Propagation Method Ultrasonic Flowmeter' has formulated corresponding standards. ^/D 18604-2001 'Measuring Natural Gas Flow with Gas Ultrasonic Flowmeter'. ①Basic principle. Used to measure natural gas flow Ultrasonic flowmeters are generally time-of-flight flow measuring instruments composed of ultrasonic transducers with their own measuring pipe sections. The transducers are generally installed along the pipe wall and directly in contact with the fluid. The ultrasonic pulse emitted by one transducer is transmitted by the other. Received by one transducer, and vice versa.Figure 3.24 shows the simplified geometry of two transducers 1x1 and 1x2, the angle between the sound channel and the pipeline is&The pipe diameter is 0. Reflective channels are used in some instruments, where the sound pulse is reflected one or more times from the pipe wall. Ultrasonic pulses travel through pipes like ferry boats to rivers. If there is no flow, the sound wave will travel with the same speed in both directions. When the gas flow velocity in the pipe is not zero, the pulse traveling downstream in the direction of the gas flow will speed up, while the pulse traveling upstream will slow down. Therefore, compared to the case of no airflow, the time ^ of forward flow propagation will be shortened, and the time ^; This is the basic principle of transit-time ultrasonic flow.

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