Ultrasonic flowmeter in gas flow testing applications

1. An overview of nanchang iron and steel co. , LTD. ( Cultivation) In the aspect of comprehensive utilization of coal gas has a very distinctive features: no mixed gas holder, coke gas Fried mixed blast furnace gas in the pipeline directly; Blending ratio is often a changing with fluctuations in production. All of these gas flow of accurate measurement to bring very great difficulty. For a long time, cultivation in the gas flow measurement is the use of orifice venturi tube ( Or working these pipes) The throttle device such as tidal volume. This device for measuring the medium stable, installation condition is strict, range than small. For JiaoJu gas composition complex, orifice and these pipes, it is easy to adhere to some impurity on the throttling device is very difficult to clean, apply pressure hole was often exhausted, maintenance workload is very large. Ultrasonic flowmeter is determined by measuring the ultrasonic pulse along the direction of flow downstream tones of different travel time to measure the fluid velocity and flow of the new technology, its fluid no resistance, no pressure loss, less restricted by fluid physical properties, the use of simple ・ at present most of the ultrasonic flowmeter products are used for the measurement of liquid ( For example, water, etc. ) ≌ body, which is used to test the very rare. Cultivation on coking on the no. 3 industrial gas ultrasonic flow dispute solves problems in gas flow measurement at present. 2. Working principle as shown in figure 1, in the gas pipeline division with a pair of ultrasonic probe, the distance between two probes is the transmission of ultrasonic acoustic distance ・ ultrasonic between two probes of downstream transmission and upstream transmission time is respectively: ts = + VcoS&theta L/c; ( 1) tn = L / c - VcoSθ ( 2) Type: c— The ultrasonic velocity in the gas; y— The uneven flow velocity in the gas in the pipeline; θ — The Angle between the ultrasonic acoustic distance L and pipeline axis. By type ( 1) Type ( 2) Average velocity of the gas in the pipeline can be obtained as follows: V = L / 2 cos & theta; ( 1/ts- 1 / tn ( 3) From the type, 3) As you can see, gas in the pipeline of the average flow velocity V and the ultrasonic propagation time difference between the gas in the downstream and upstream, there exists a linear relationship with the media and ultrasonic velocity in the medium. As long as in the downstream and upstream directions respectively measure the ultrasonic propagation time, can be calculated by the gas flow velocity, and then through the cross section area of gas pipes and Reynolds number of fluid dynamics of adjusted by gas flow. 3. Practical application on December 15, 2001, installed in the coking industry gas main 3 a ultrasonic flowmeter, installation position as shown in figure 2 & middot; Industrial gas main pipe diameter 1 3. 2 m, designed by coke oven gas flow 20000 nm3h, January 24, 200 meter to make use of gas tank height ratio on the results table. Than, you will be closed by gas tank in and out of the valve gas box initial height of 48. 56 mm, and then looked at 30 min, in a highly unchanged and confirmed the valve without leakage. As can be seen from the result table, ultrasonic flowmeter can measure the conform to the actual situation of the gas flow rate, error control when & plusmn; 5% of the range, accord with the requirement of industrial measuring precision. Conclusion through one year trial, coking on the no. 3 industrial gas use ultrasonic gas flowmeter, in really, stability, etc all can completely meet the requirements, basically solved the current problems in gas flow measurement compared to other flow meter, ultrasonic gas flowmeter has the following advantages: ( 1) Not only for small diameter and can measure the gas flow of the big diameter; ( 2) Insert components and can branch does not change the flow of the gas, the gas flow rate has no resistance, no pressure loss, especially it is important to have nothing to do with the measured medium, better solve the mixing ratio often change of gas flow measurement problem; ( 3) Can not only on stability of air flow measurement, and can measure of pulsating flow; ( 4) Simple operation, easy to tear open outfit, easy cleaning maintenance; ( 5) Ultrasonic probe of the life is long, linear measurement results, the theoretical accuracy is better than 1%, the event be used precision is better than that of 5%, can fully meet the requirements of industrial measurement.

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