Abstract: how to improve the measuring accuracy of orifice meter scale research information produced by excellent
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Fast with the development of natural gas in our country, so you need very high precision gas flow meter.
At present our country most of the natural gas enterprises to adopt natural gas flow measurement instrument for orifice flowmeter, it has simple structure, cheap and its cost.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is how to improve the measuring accuracy of orifice meter scale research articles for details.
Fast with the development of natural gas in our country, so you need very high precision gas flow meter.
At present our country most of the natural gas enterprises to adopt natural gas flow measurement instrument for orifice flowmeter, it has simple structure, cheap, and the advantage of the high accuracy of measurement.
According to relevant data show that more than ninety-five percent of the orifice meter used in petroleum and natural gas enterprises trade measurement meter.
Orifice meter is installed in the pipeline the pressure difference on both sides of the concentric orifice plate to get the traffic data of testing instruments.
Its mainly by throttling device, differential pressure gauge, pressure gauge and thermometer.
It according to the law of conservation of energy and flow continuity equation of these principles to the design and manufacture.
Its method of calculation of gas flow is generated through the throttle device, pressure difference, and then into some instruments measure differential pressure, temperature and pressure, after zui or computer control system in the use of flow totalizer. especially zui after get the data.
1 orifice meter work principle and characteristics of the orifice flowmeter in the law of conservation of energy and flow continuity equation for the design principle, the calculation method is according to the concentric orifice in a piping on both sides of the calculated pressure difference, its structure is composed of such as thermometer, pressure gauge, the throttle device.
Due to its low cost, simple structure, high measurement precision, and suitable for engineering survey and trade of accuracy is not high.
Orifice flow meter used in our country has been a long time, and has very mature orifice meter design, production, processing experience, the production of orifice flowmeter can measure some unknown range of gas flow.
At present, our country mainstream gas measuring instrument or orifice meter.
The compression factor;
Fr—
—
—
The flow temperature coefficient;
P1—
—
—
Upper orifice plate with holes is absolutely static, MPa.
3 3 orifice flowmeter metering error analysis.
1 outflow coefficient C's influence on the measuring accuracy of orifice flowmeter calibration in the outflow coefficient, it needs to be in the length of the straight pipe upstream reach enough, at the same time, the throttle device needs to reach the necessary technical requirements.
And flow coefficient and Reynolds number and change with the concerned.
C value increases, the Reynolds number becomes smaller, reduced c value, conversely Reynolds number increases.
Flow coefficient C also changes with the flow, the change is decreases with flow become bigger, than when the actual flow calibration traffic hours, by its traffic error will increase.
C value is a variable at the same time, based on Reynolds number change to change, when the Reynolds number to a certain value, its variation will be smaller.
Guan Yu Falan take pressure, Reynolds number more than 106, and about the transition with its value to more than 210.
3.
2 the actual physical properties of measured medium uncertainty factors (
1)
The influence of gas relative density for flow measurement.
Gas flow value will change with the changes in 1 / Gr, their relationship is direct proportion relationship between, this can be from the above formula (
2)
Can be seen in the can be learned.
If the quantity of the Gr is regarded as a separate, so when the uncertainty of Gr is plus or minus zero point five percent, this is the standard gas volume flow uncertainty of plus or minus zero point two five percentage points, so obvious flow measurement will be affected by the relative density of gas actual.
Uncertainty caused by Gr reason is because there is no measurement and analysis and determine the relevant physical parameters of the real gas.
The actual air components, for example, deviates from the standard deviation degree of components, the uncertainty of the relevant components of molecular weight measurement.
At present there are two ways to confirm, Gr * is to use gas buoyancy balance, momentum hydrometer instrument to detect the actual relative density;
The second is the gas analysis instrument, first learned that all component of natural gas, according to the calculated value of Cr.
Now our country is usually a way after use.
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