In Europe and the United States, the gas turbine flowmeter is the main gas meter.At present, domestic gas metering also mainly USES gas.In foreign countries, almost no one adopts the measurement of gas precession vortex flow.At present, the gas precession vortex flowmeter has some applications in China.In the standard case.Iso 900551 issued by the standardization organization and recommendations R6 and R32 issued by the legal metrology organization. China and developed countries have corresponding national standards and regulations. The above documents guarantee the authority of gas turbine flowmeter in gas metering.But the gas precession vortex flowmeter has not made the related standard up to now.It is difficult to guarantee the authoritativeness of the flowmeter in gas metering.At present, among the flow meters used for gas measurement in China, the gas turbine flowmeter occupies a leading position, and the gas spiral-vortex flowmeter also has a certain market. The usage occasions of the two are relatively similar, and users often have doubts about the selection of the two.

Gas turbine flowmeter is the main type of flowmeter, its working principle is: gas into the gas turbine flowmeter is accelerated by the guide body, gas is accelerated by importing channel role on the turbine blades, the momentum of the gas turbine rotation in the flow meter, at a certain flow within the scope of the revolutions of the turbine and flows through the volume of a gas is proportional to the.The turbine revolution f can be obtained by mechanical or electromagnetic induction, and thus the flow rate Q of gas through the flow meter can be obtained.

Gas turbine flowmeter is widely used to measure the flow or total volume of expensive gas such as gas, and it is widely used in the measurement of natural gas flow at home and abroad.The theoretical research and practical experience of gas turbine flowmeter are very mature, there are corresponding standards, countries also have corresponding national standards, China has also adopted the standard.In Europe and the United States, gas turbine flowmeters are the main gas flow meter. In the Netherlands alone, more than 2,600 gas turbine flowmeters are used in natural gas pipelines.

Gas precession vortex flowmeter is a flowmeter that began to appear in the 1970s. Its working principle is as follows: the gas entering the spiral vortex flowmeter is first forced to rotate and accelerate through a spiral generator, forming a vortex. The center of the vortex is the vortex core.After the accelerated vortex enters the expanded segment, it decelerates sharply and the pressure rises to produce backflow. Under the effect of backflow, the vortex core makes spiral precession around the axis line of the flowmeter.The flow rate Q can be deduced by measuring the vortex precession frequency f induced by the sensitive element.

The pressure loss of gas turbine flowmeter is small, and it is suitable for gas metering in low-pressure transportation.The pressure loss of gas spiraling vortex flowmeter is a little larger.High requirements for medium cleanliness, improper use will be damaged.Gas precession vortex flowmeter gas precession vortex flowmeter has less requirement on medium cleanliness than gas turbine flowmeter.

Gas turbine flowmeter high precision.It is * accurate among all flowmeters.The measuring accuracy of gas precession vortex flowmeter is inferior to the former.The meter has good repeatability and is the preferred flow meter in trade settlement.The repeatability of gas precession vortex flowmeter is general.

Gas turbine flowmeter can also obtain high frequency signal, signal resolution is strong.The frequency signal of gas precession vortex flowmeter is very low, the larger the diameter is, the lower the signal resolution is.Let's measure the error.

Gas turbine flowmeter range is wide, generally in 40:1~20:1, the measurement range is wide, can be suitable for the occasion with large flow change.When natural gas is transported, the flow rate generally varies greatly, so it is especially suitable for natural gas measurement.The latter range degree is medium, generally 15:1~10:1, the measurement range is slightly narrow, in the gas measurement, more suitable for the occasion with little change in flow.In terms of seismic performance, the gas turbine flowmeter has a better resistance to pipe vibration.Gas precession vortex flowmeter is easy to be affected by pipeline vibration, so it should be paid special attention to avoid as much as possible.