Appropriate scale gas turbine flowmeter calibration precision analysis

Abstract: the scale gas turbine flowmeter calibration accuracy analysis of the information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Pick to: analysis of various factors affecting gas turbine flowmeter calibration accuracy, and the solution was put forward. 1 introduction due to the development of production, the use of coal, fuel increase too fast, causing environmental pollution is more and more serious, vigorously develop natural gas, for this purpose. More flow meter manufacturers choose model price quote you are welcome to inquire, here is suitable for gas turbine meter scale calibration precision analysis for details. Pick to: analysis of various factors affecting gas turbine flowmeter calibration accuracy, and the solution was put forward. 1 introduction due to the development of production, the use of coal, fuel increase too fast, causing environmental pollution is more and more serious, therefore vigorously develops the clean fuels such as natural gas, coal gas, biogas use become an important means to solve the problem of environment, and has made great achievements. The development of gas trade gas metering accuracy is more important. Seek, therefore, high precision measuring instrument has become in the gas trade an important problem to be reckoned with, and the calibration method and calibration system is directly related to the choice of actual measurement precision is the key to the flowmeter. Gas turbine flowmeter ( Hereinafter referred to as & other; Turbine table & throughout; ） Is the speed type flow measuring, has the wide range ( Range than Qmax: Qmin up to now to those days) , as well as good repeatability. In the domestic and foreign gas, petrochemical and other industries widely used. Although turbine table itself accurate measurement, high precision, but if the factory when the calibration is not accurate, directly affect the measuring accuracy. Each turbine abroad table must strictly calibrated before put into use, the standard device mainly & other; The standard gas turbine flowmeter & throughout; 、“ Sonic nozzle & throughout; 、“ The bell jar type standard meter & throughout; 、“ Standard cylinder gas meter & throughout; 、“ Standard rotor blades gas meter & throughout; And so on, the top three for commonly used standard device. In order to ensure that it as a trade settlement on the basis of its former, accuracy, and improve the gas turbine flowmeter calibration accuracy become urgent task. The factors of influencing precision is 2. 1 standard devices are briefly introduced the influence of three kinds of standard device: standard gas turbine flow meter with high precision, calibration speed, low cost advantages, but with the passage of time, because of its internal wear of bearings and other moving parts will cause the change of the standard turbo table itself performance, thereby reducing the calibration accuracy. So the standard turbo table itself need calibration on a regular basis. And standard turbo table size is smaller, by gas flow rate is smaller, its precision is affected by internal moving parts wear trend. Therefore, when need to calibrate turbine table size is small ( Less than 100 mm) As a standard device, unfavorable choose turbine table. Sonic nozzle fluid mechanics principle is: when the nozzle upstream side air flows out through the nozzle, if after the nozzle pressure P1 and the ratio of the nozzle pressure P0 before P1 / P0 less than a certain critical value ( When in the air as medium to 0. 528). , to be achieved on the nozzle exit airflow speed of sound, and when the pressure than P1 / P0 continue to reduce the airflow rate remains sound the same, so the connection have been calibrated flowmeter system of fixed critical flow rate, and used time multiplied again, known by the volume of standard device number. So can be used as flow standard device to check meter. Under ideal conditions of sonic nozzle calibration precision is very high, but there is a viscous gas, so gas through the nozzle, to produce energy losses, resulting in calibration error. Error with the size of the nozzle shape, geometry size, the quality of surface processing, and through the throat diameter of the gas Reynolds number. Bell jar type flowmeter standard meter calibration of flow range is conditioned by the size of the bell volume. When the bell volume is small, compared with the table under test in the process of measuring volume number is smaller. Random error will increase, the impact of turbine meters large flow calibration precision of the test points. Set bell volume V, let, down time is about 1 minute, then they can test the zui large flow, large Qzui = 60 & times; V capacity ( m3 / h) In addition, the influence of sound nozzles, the bell jar type standard calibration precision of the factors and container gas temperature in a short period of time is not uniform, the moisture content of the gas is too large. Environmental temperature, humidity and pressure changes, etc. Understand the characteristics of different standard device, you can choose the right in the actual calibration standard device. In the conditions allow as much as possible to choose high precision standard device, because the precision of standard device itself and operating procedures directly affect the calibration precision of the turbine under test table. 2. The influence of pressure and calibration temperature 2. 2. Table 1 turbine flow characteristics when the flow is greater than the initiating flow values, with the increase of flow rate, the turbine rotating angular velocity will increase. In measuring range, fluid resistance torque T will be impact flowmeter features is trapped. Relatively speaking, generated by the friction bearings and other mechanical driving part mechanical torque is small.

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