The characteristics of pipeline target flowmeter: ① the temperature of the measured fluid is not very high. When the steam flowmeter is installed at the liquid inlet of the heat exchanger, the fluid temperature is generally not higher than 140 ℃, when it is installed at the liquid inlet and outlet of the heat exchanger, the fluid temperature is lower; ② the working pressure of the measured fluid is not very high. In the heating system of the house, in order to send hot water to the top floor, sometimes the working pressure is higher; in the heating system of the road pipe network, the working pressure is more than 1MPa; ③ the pipe diameters are different. For the least customers, the pipe diameter is only dn20-dn40, while the large-diameter steam flowmeter sometimes reaches 10m up and down; ④ the cleanliness is good. Although hot water is not as clean as drinking water, the solid matter in the water and its viscosity are not easy to cause great harm to the general steam flowmeter; ⑤ corrosion. The water does not etch the flow measurement instrument panel, but the geothermal water has a certain level of etching, because it has sulfate, etc., which can etch the general stainless steel plate, the higher the fluid temperature is, the more serious the etching is; ⑥ the scope is not very high. The size of pumps for hot water transportation in power plants (stations) is generally integrated. When the heat supply is large, generally several large pumps are opened, and the heat supply is the most hour, generally only one small pump is opened, and the ratio of the large total flow to the minimum total flow is about 5-10. Steam flow meter for heat metering and verification of individual customers,
1. The plug-in target flowmeter is still used to measure the total flow of power supply and return water output in the large-diameter pipeline of power plant (station), mainly taking the following advantages: ① the orifice has high credibility. It is not easy to cut off heating due to orifice plate; ② it is convenient to measure and verify. As long as the orifice plate is measured and verified by geometry method, instead of some air flow meters and intelligent transmitters, it is necessary to recheck the real flow correction of the management center on the standard equipment; ③ when the specification is large, the project investment is relatively low. It is not enough to have a large pressure loss, so it is unfavorable to save driving force. 3. It is the most ideal instrument panel for hot water flow measurement. The obvious advantages are as follows: ① the pressure loss can be ignored, because the nominal diameter of the measuring pipe is the same as that of the pipeline; ② the specification is small to large, and the series of products are complete; ③ the measurement accuracy is high, and the target flowmeter can achieve high accuracy even though the force water flow is very low; ④ the temperature level can consider the measurement must. In the high temperature resistance level of 120 ℃, the flow measurement range of 10 in the central heating can meet the requirements, but when the hot water valve is turned off, the total flow range is 0.
Most of the targets must be measured. The high temperature resistance level of 180 ℃ can consider the necessity of measuring the target with the fluid temperature higher than 120 ℃; ⑤ the working pressure level can consider the necessity of measurement. In the commercial sample version, some of the fixed large caliber working pressure levels can only achieve 0.6-1mpa, but can be used as a unique order, taking into account the provisions of the application target with high working pressure; ⑥ there are corrosion-resistant products Product series. Because the origin of warm water is different, its corrosion is also different. For the hot water containing sulfate, it can meet the requirements with PTFE lining and titanium electrode; ⑦ it has strong adaptability to the vibration of pipeline and natural environment; ⑧ it can measure the pulsating beverage flow with low frequency of pulsating beverage
4. The perfect application of hot water flow measurement has a history of more than 10 years, with a rapid development trend. This kind of ultrasonic flowmeter is especially suitable for the purpose of no parking opportunities all year round.
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