Gas turbine flowmeter is mainly used to measure the flow of medium fluids such as air, nitrogen, oxygen, hydrogen, methane, natural gas and steam in industrial pipelines. It is almost independent of the parameters such as fluid density, pressure, temperature and viscosity when measuring the volume flow rate under working conditions. No mechanical parts, so high reliability, small maintenance. Instrument parameters can be stable for a long time. The gas vortex flowmeter adopts piezoelectric stress sensor, which has high reliability and can work in the working temperature range of - 20 ~250 ~C. It has analog standard signal and digital pulse signal output. It is easy to be used with computer and other digital systems. It is an advanced and ideal flow meter.
The output pulse frequency signal of the gas vortex flowmeter is not affected by the change of fluid physical properties and components. That is to say, the instrument coefficients are only related to the shape and size of the vortex generator and the pipeline within a certain range of Reynolds number. But as a flowmeter, mass flow should be detected in material balance and energy measurement. At this time, the output signal of flowmeter should monitor volume flow and fluid density simultaneously. Fluid physical properties and components have a direct impact on flow measurement. Gas Vortex Street Flowmeter is a new type of flowmeter for measuring fluid flow in closed pipeline based on Carmen Vortex principle. Because of its good medium adaptability, the volume flow of steam, air, gas, water and liquid can be measured directly without temperature and pressure compensation. The volume flow and mass flow of standard condition can be measured by temperature and pressure sensors. It is an ideal substitute for throttle flowmeter.
In order to improve the high temperature and vibration resistance of gas, the gas vortex flowmeter can be used under high temperature (350 C) and strong vibration (< 1g) because of its unique structure and material selection. In practical application, the large flow rate of Zui is far below the upper limit of the instrument. With the change of load, the small flow rate of Zui is often lower than the lower limit of the instrument. The instrument does not work in its Zui optimal working section. To solve this problem, usually reducing the diameter at the measuring section to increase the flow rate at the measuring section, and choosing the smaller diameter one. Instrument is beneficial to the measurement of instrument, but this method of diameter change must be rectified between the tube and the instrument in a straight section with a length of more than 15D, which makes the processing and installation inconvenient.
In order to use conveniently, the battery-powered on-site display gas vortex flowmeter uses micro-power high-tech. It can run continuously for more than one year with lithium battery power supply, which saves the purchase and installation cost of cables and display meters, and can display instantaneous flow and cumulative flow on-site. The temperature compensating integrated vortex flowmeter also has a temperature sensor, which can directly measure the temperature of saturated steam and calculate the pressure, thus showing the mass flow rate of saturated steam. Temperature and pressure compensating integrated sensor with temperature and pressure can be used to measure the gas flow directly, so as to show the standard volume flow of gas.
Application occasion of gas turbine flowmeter
Power generation and cogeneration, heating industry; aviation, aerospace, shipbuilding, nuclear energy and weapons industry; machinery, metallurgy, coal mine and automobile manufacturing industry; petroleum and chemical industry; medicine, food and smoke manufacturing industry; forest industry, agricultural reclamation and light industry.
Working Principle of Gas Turbine Flowmeter
Gas turbine flowmeter is measured by turbine. It first converts the velocity of the flow into the speed of the turbine, and then converts the speed into an electrical signal proportional to the flow rate. This flowmeter is used to detect instantaneous flow and total accumulated flow. Its output signal is frequency and easy to digitize. The induction coil and * magnet are fixed on the shell. When a ferromagnetic turbine blade passes through a magnet, the magnetoresistance of the magnetic circuit changes, which generates an induction signal. The signal is amplified and shaped by an amplifier and sent to a counter or a frequency meter to show the total accumulated flow. At the same time, the pulse frequency is converted from frequency to voltage to indicate the instantaneous flow rate. The speed of the impeller is proportional to the flow rate, and the speed of the impeller is proportional to the total flow. The output of the turbine flowmeter is a frequency modulation signal, which not only improves the anti-interference ability of the detection circuit, but also simplifies the flow detection system. Its range ratio can reach 10:1, and its accuracy is within (+0.2%). The time constant of the turbine flowmeter with small inertia and size can reach 0.01 seconds.
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