The main performance comparison of common gas flowmeters, commonly used gas flowmeters mainly include membrane gas meters, Roots gas flowmeters and turbine gas flowmeters, and their respective performances have certain differences.
Comparison of main performances of common gas flow meters
Commonly used gas flowmeters mainly include membrane gas meters, Roots gas flowmeters and turbo gas flowmeters. The measurement principles are different, the operating conditions and the parameters of the gas to be tested are also different, and their respective performances also exist. Certain differences.
1 According to the national requirements for energy metering, the relative measurement error of membrane gas meter, Roots gas flowmeter and turbo gas flowmeter is ±2%.
2 Because the measurement principle of the gas flowmeter is different, the measurement range of the gas is different, and the pressure loss is also different.
3 Membrane gas meter belongs to the volumetric flow, a single metering volume (circulating volume) is discharged to the outlet, and then connected to the counter through a mechanical transmission mechanism, and the calculation of the single metering volume and the single metering volume is performed, thereby making it possible to measure The total volume of gas that is circulated (metered). Membrane gas meter has wide measuring range and convenient installation. It has low requirements on the front and rear straight pipe sections. However, its volume is large, the measuring range is small, it is easy to be corroded, resulting in leakage and measurement inaccuracy, and maintenance is not convenient. It is only suitable for low pressure. It only measures the flow of working conditions, and it is not easy to implement intelligent temperature and pressure compensation. There are about 500 sets of 6-100 m3/h gas gas meters that our company uses online, and about 50 sets need to be replaced every year. The main problem is not to go through words and leaks. We have removed the film gas meter for online use and found that it is not qualified. The main problem is that it is severely slow or not traversing at small flow rates. Membrane gas meters cannot be routinely maintained, only replaced, sent to the factory for repair or scrapped.
4 Roots flowmeters are also volumetric flowmeters. As the gas passes, the differential pressure between the population of the gas meter and the outlet acts on a pair of waist wheels that are joined together by high-precision synchronous wheels, thereby driving the waist. The wheel rotates, and the gas filled in the metering chamber is quantitatively discharged, and then connected by the mechanical transmission mechanism and the totalizer to realize gas volume measurement and data conversion. Our company mainly uses the Roots flowmeter for canteens and catering users with large gas consumption (greater than 100 m3/h). After use, it has the following advantages: high precision, wide range ratio, low initial flow rate, easy installation, maintenance and cleaning (maintenance can be maintained on site), low requirements for straight pipe sections before and after the flowmeter, and online Temperature and pressure intelligent compensation, suitable for high and medium pressure measurement. Compared with the gas meter, the price of the Roots flowmeter is higher than that of the membrane gas meter under the same flow conditions, but the cost performance is high, and it is more economical than the membrane gas meter after comprehensive consideration. During installation, prevent debris, welding slag, etc. from entering the flowmeter. Install the filter before the flowmeter. Before the ventilation, the flowmeter should be installed after the pressure test. Regularly clean the filter during operation to ensure proper operation of the Roots flowmeter.
5 Turbine flowmeter is a speed type flowmeter. The measuring principle is to measure the volumetric flow rate of gas by using the turbine placed in the gas to sense the average gas velocity. The turbine speed is proportional to the volume of the gas to be measured. Turbine flowmeter has high precision, large flow, working condition flow of more than 6 000 m3/h, and high degree of intelligence, which can realize online temperature and pressure compensation. However, the installation conditions are relatively high, and there is a requirement for the length of the straight pipe before and after the installation position of the flowmeter, the range ratio is small, and the cleanliness requirement for the gas is also high. It is suitable for the measurement of natural gas and liquefied petroleum gas, and is mainly used for gas equipment with relatively constant heat load such as furnace and kiln in industrial and mining enterprises.
(From Hebei Zhenxing Gas Pressure Regulator Co., Ltd.** Gas ​​Regulator http://)
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