Analysis on application fields of gas turbine flowmeter
Gas turbine flowmeter is mainly used for flow measurement of air, nitrogen, oxygen, hydrogen, biogas, natural gas, steam and other medium fluids in industrial pipelines, when measuring the volume flow under working conditions, it is almost not affected by fluid density, pressure, temperature, viscosity and other parameters.
There are no movable mechanical parts, so the reliability is high and the maintenance is small. Instrument parameters can be stable for a long time.
Gas vortex flowmeter adopts piezoelectric stress sensor with high reliability-
20 ° C ~ Work in the working temperature range of 250 ℃.
It has analog standard signal and digital pulse signal output, and is easy to be used with digital systems such as computers. It is a relatively advanced and ideal flow meter.
The pulse frequency signal output by gas vortex flowmeter is not affected by the change of fluid physical properties and components, I . e. the instrument coefficient is only related to the shape and size of vortex generator and pipeline within a certain Reynolds number range.
However, as a flowmeter, mass flow needs to be detected in material balance and energy metering, then the output signal of the flowmeter should monitor volume flow and fluid density at the same time, fluid physical properties and components still have direct influence on flow measurement.
Gas vortex flowmeter is a new type of flowmeter that measures the fluid flow in closed pipelines according to Carmen vortex principle.
Because of its good medium adaptability, it can directly measure the working condition volume flow of steam, air, gas, water and liquid without temperature and pressure compensation, equipped with temperature and pressure sensors, it can measure standard condition volume flow and mass flow, and is an ideal substitute for throttling flowmeter.
In order to improve the high temperature resistance and vibration resistance of gas, the gas vortex flowmeter can be used at high temperature (350 ° C)Strong vibration (≤ 1g)Used under severe working conditions.
In practical application, the large flow of zui is often much lower than the upper limit of the instrument. With the change of load, the small flow of zui is often lower than the lower limit of the instrument. The instrument does not work in its zui working section, in order to solve this problem, it is usually adopted to reduce the diameter at the measuring place to increase the flow rate at the measuring place, and to select an instrument with smaller diameter to facilitate the measurement of the instrument, however, this method of reducing diameter must have a straight pipe section with a length of more than 15 days between the reducing pipe and the instrument for rectification, which makes the processing and installation inconvenient.
For the convenience of use, the battery-powered local display gas vortex flowmeter adopts micro-power consumption high-tech, and uses lithium battery power supply to operate for more than one year without interruption, the procurement and installation costs of cables and display instruments are saved, and instantaneous flow and accumulated flow can be displayed locally.
The temperature compensation integrated vortex flowmeter is also equipped with a temperature sensor, which can directly measure the temperature of saturated steam and calculate the pressure, thus displaying the mass flow of saturated steam.
The temperature and pressure compensation integrated type is equipped with temperature and pressure sensors, which are used for gas flow measurement and can directly measure the temperature and pressure of the gas medium, thus displaying the standard condition volume flow of the gas.
Gas turbine flowmeter applications, power generation, cogeneration and heating industries;
Aviation, aerospace, shipbuilding, nuclear energy and weapons industries; Machinery, metallurgy, coal mine and automobile manufacturing industry; Petroleum and chemical industries; Pharmaceutical, food and tobacco manufacturing industries; Forest industry, agricultural reclamation and light industry.
Working Principle of gas turbine flowmeter, gas turbine flowmeter uses turbine for measurement.
It first converts the flow rate into the rotation speed of the turbine, and then converts the rotation speed into an electrical signal proportional to the flow rate.
This kind of flowmeter is used to detect instantaneous flow and total totalized flow. Its output signal is frequency and is easy to digitize.
In the figure, the induction coil and the * magnet are fixed together on the housing.
When the ferromagnetic turbine blade passes through the magnet, the magnetic resistance of the magnetic circuit changes, thus generating an induction signal.
The signal is amplified and shaped by an amplifier and sent to a counter or a frequency meter to display the total accumulated flow. At the same time, the pulse frequency passes through the frequency-Voltage conversion to indicate instantaneous flow.
The rotation speed of the impeller is proportional to the flow rate, and the rotation speed of the impeller is proportional to the total amount flowing through.
The output of turbine flowmeter is a frequency modulated signal, which not only improves the anti-interference performance of the detection circuit, but also simplifies the flow detection system.
Its range ratio can reach 10:1 and its accuracy is 0. Within 2%.
The time constant of turbine flowmeter with small inertia and small size can reach 0. 01 seconds.
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