To explore the influential factors of vortex street flowmeter measurement accuracy

At present, the commonly used at the scene of the smelting, chemical industry, orifice flow meter is vortex street flowmeter flowmeter and electromagnetic flowmeter, the vortex street flowmeter because of wide measuring range, simple maintenance, to adapt to a variety of media type etc, has been more and more practical application, use effect also recognized by users. However, due to measurement characteristics of vortex flowmeters, the measurement accuracy is influenced by external factors more, prone to the problem of the inaccurate measurement, measurement, if not handled properly will produce a large measurement error. 1. Vortex flowmeter by a formula for calculating the factors affecting the accuracy of analysis, the mass flow rate and density, also by the pipeline pressure, fluid type, steam humidity, environmental factors, these factors are directly related to the flow measurement accuracy. 1. 1 using vortex flowmeter measurement of saturated steam dryness change, requirement of saturated steam humidity less than 15%. However, when the saturated steam pipeline transportation distance, the saturated steam humidity will be more than 15%, this will reduce the result. First steam flowmeter measurement on the market volume flow, and according to the density of steam mass flow calculation, the assumption of steam completely dry. If you don't consider the effect of steam dryness, the data will be lower than the actual flow. Flowmeter secondary instrument, therefore, should have set the saturated steam humidity and correction function. At the same time, improve the quality of steam flowmeter can improve the accuracy of flow meter as a whole. Improvement measures: in the flowmeter ロ ( 7 ~ 8) D with a humidity transmitter, the correction according to the following formula: V - XVg+( 1 - X) Vf type: V - Wet steam specific volume, m3 / kg; X - Dryness, %; Vg - The specific volume of saturated steam, m3 / kg; Vf - The volume of water, m3 / kg; ( 1 - X) - Humidity, % 1. 2 stress due to changes in the field use occasions, there will be a lot of valves in pipeline, the action of any valve will change of the pipeline pressure value, pressure change is to change the density of the steam. At the same time, open the valve of the steam flow action will also change the pipeline, causing measurement error. Improvement measures: according to the change of the pressure on traffic density modification, at the same time, in the case of unnecessary to reduce the operation of the valve. 1. 3 pipeline vibration meter coefficient of vortex flowmeter and the flowmeter errors related to pipeline vibration velocity, the overall seismic performance is poor. Along with the increase of the pipeline vibration frequency meter coefficient decreases. If there is no proper strengthening pipe and flow meter, or flow meter near the motor vibration vibration may interfere with vortex flowmeter, the flowmeter measurement values on the high side or misjudgment leads to flow. Improvement measures: reinforce the flow meter according to construction requirements, in the front-end and back-end flow meters installed fastening device, and add a cushion. 1. 4 meter exit side to atmospheric vortex flowmeter export side directly to the atmosphere, both before and after the pressure difference is too big, can not correctly reflect the changing flow, is mainly caused by pipeline layout is not reasonable improvement measures: inlet side add 2 rectifier in sensors. Flow meter daily maintenance method in the use of 2. 1 meter maintenance ( 1) Regular cleaning, probe is an important tectonic flowmeter, if the probe to detect holes blocked, winding, bag, or other object will affect the normal measurement, lead to inaccurate results. ( 2) Moistureproof processing, most of the probe did not pass moistureproof processing, if the use of the environment is relatively wet, or after cleaning without drying, will cause the flowmeter performance is affected by a certain, lead to perform poorly. ( 3) Regular inspection, the use of the meter to minimize the interference of the outside world, strict inspection meter grounding and shielding condition, ensure the accuracy of flowmeter measurement. 2. The daily maintenance of 2 meter ( 1) Used for routine suppression, protection of flowmeter flowmeter lining, and reduce oil physical contact, avoid the influence of flowmeter insulation lining. At the same time avoid rigid contusion damage surface finish. ( 2) Internal parts have very * avoid vibration, flow meter, if there is a strong vibration, will lead to internal deformation or fracture, and to avoid corrosive liquid flow. ( 3) The differential zero zero, for every 10 days or so. 2. 3 meter calibration for keeping the flowmeter measurement accuracy, stability, need for a period of time ( Usually one year) For verification or calibration, verification need to be sent to the designated units of metrological verification and calibration can be outsourced, or operations, you can use a higher level of flow standard device for vortex flowmeter calibration, need to pay attention to the standard calibration equipment, calibration procedures and standard precision grade whether meet the requirements of actual use. 3. Conclusion we through analyzing the influence factor of vortex street flowmeter measurement accuracy, and master the important influence factors, targeted to take measures to solve, ZUI much to eliminate or reduce the impact. Flow and vortex flowmeter measurement, with pressure, temperature, flow velocity compensation further ensure measurement accuracy, realizes the accurate measurement. At the same time also to do daily maintenance and maintenance, ensure the normal flow precise operation.

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