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1. Velocity flow meter

 

Gas turbine flowmeter

 

The velocity flowmeter is a flowmeter based on the principle of directly measuring the flow velocity of the full pipe in a closed pipe. Industrial applications mainly include:

 

① Turbine flowmeter

 

②Vortex flowmeter

 

③Vortex precession flowmeter

 

④Time difference ultrasonic flowmeter

 

2. Volumetric flowmeter

 

Roots flowmeter (gas waist wheel flowmeter)

 

There is a fixed large space inside the positive displacement flowmeter and a set of rotating bodies that divide the space into several small spaces of known volume, such as waist wheel, membrane, drum, scraper, oval gear, piston, screw, etc. The rotating body continuously rotates under the action of the fluid pressure difference, continuously expelling the fluid from a small space of known volume. According to the number of rotations of the rotating body in a certain period of time, the volume through which the fluid flows can be calculated.

 

In the standard state, the volumetric flow calculation formula of the positive displacement flowmeter is the same as that of the velocity flowmeter. A gas displacement flowmeter is a mechanical instrument that generally consists of a measuring body and an accumulator. When temperature and pressure change, a pressure gauge (sensor or transmitter), thermometer (sensor or transmitter), flow totalizer (temperature and pressure compensation) or flow computer (temperature and pressure compensation and compressibility compensation) are required .

 

3. Differential pressure flowmeter

 

Orifice flowmeter (differential pressure flowmeter)

 

Differential pressure flow meters are based on Bernoulli's equation and fluid continuity equation. According to the throttling principle, when the fluid flows through the throttling components (such as standard orifice plate, standard nozzle, large diameter nozzle, classic Venturi nozzle, Venturi nozzle, etc.), there will be a pressure difference before and after, the pressure difference and the square of the flow proportional. Among the differential pressure flowmeters, the standard orifice throttling device differential pressure flowmeter is widely used because of its simple structure, low manufacturing cost and sufficient research.

 

Velocity gas flow meters are generally composed of flow sensors and display instruments. When temperature and pressure change, a manometer (sensor or transmitter), thermometer (sensor or transmitter), flow totalizer (temperature and pressure compensation) or flow computer (temperature and pressure compensation and compressibility compensation) is required. For occasions with high accuracy requirements (such as natural gas trading), an online chromatograph is also equipped to continuously analyze the components or physical properties of the mixed gas, and calculate the compression factor, density, calorific value, etc.


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