Water vapor flowmeter| Ultrasonic flowmeter TDS manufacturer

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What flow meters are used to measure gas flow and steam flow? Do you have any knowledgeable friends to share?

1、 The use of a throttling differential pressure flowmeter to measure steam mass flow must be coordinated with the measuring instrument used to obtain steam density, and together with the accumulator, form a derived mass flowmeter to ensure measurement accuracy. In practical application systems, the fluid temperature and pressure near the commonly used measurement points are calculated to obtain the corresponding density, and then the instantaneous mass flow rate is calculated through calculation, which is commonly referred to as temperature and pressure compensation. According to the properties and characteristics of water vapor, there can be different compensation methods for root bench seepage in overheated and saturated states.

(1) Measurement of superheated steam mass flow rate. When the fluid is superheated steam, the density depends on the fluid pressure and temperature, so measuring the mass flow rate of superheated steam requires both pressure compensation and temperature compensation.

(2) Measurement of saturated steam mass flow rate. The pressure and temperature of saturated steam are closely related, and the density of steam in critical saturation state obtained from its pressure and temperature is equal. Therefore, when measuring its flow rate with a derived mass flowmeter, both pressure compensation and temperature compensation can be used.

2、 The use of a dual range differential pressure flowmeter to measure steam mass flow rate has its inherent flaw, which is that the range is not ideal, mainly determined by its measurement principle. The factor that has the

greatest impact on flow uncertainty (and also on flow measurement range) is differential pressure measurement uncertainty. In order to improve the measurement accuracy of the low-end flow range, it is necessary to greatly improve the differential pressure measurement accuracy of the low differential pressure section. The most labor-saving and effective method is to add a low range differential pressure transmitter to form a dual range differential pressure flowmeter. The reason why the indication error of a differential pressure transmitter at the low end cannot be further reduced is that its accuracy cannot be arbitrarily determined and is constrained by factors such as the diaphragm box area. In fact, the diaphragm box area not only constrains the differential pressure value corresponding to the accuracy level, but also the differential pressure value corresponding to the environmental temperature and long-term drift effects. Adding a low range differential pressure transmitter is an effective method to improve the accuracy of differential pressure measurement when the relative flow rate is small.

3、 The biggest drawback of using a linear orifice plate differential pressure flowmeter to measure steam mass flow is that when the measured flow rate is relatively small compared to the full-scale flow rate, the dispersed differential pressure signal is very small, which greatly affects its range and measurement accuracy. People have developed a variable area and variable head orifice plate flowmeter based on the conventional orifice plate differential pressure flowmeter to address its shortcomings. Because there is a linear relationship between the differential pressure signal output and the measured flow rate, it i

Water vapor flowmeter

What flow meters are used to measure gas flow and steam flow? Do you have any knowledgeable friends to share?

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