Discuss the influence of temperature and pressure compensation on the measurement of steam flowmeter
Discuss the influence of temperature and pressure compensation on the measurement of steam flowmeter
With the increasing cost awareness, higher requirements are put forward for the accuracy of energy measurement. The temperature and pressure compensation of flow measurement are gradually mentioned as important positions. Due to the design process of the flow measuring device, the design temperature and pressure provided are different from the actual working temperature and pressure, or the fluid temperature and pressure fluctuation caused by the process are large, so that the measured flow rate cannot truly reflect its work. Actual traffic in the state. Most flowmeters can only guarantee high measurement accuracy if the fluid conditions are consistent with the design conditions. Some fluids such as gas, steam, and fluid conditions have a great influence on the measurement accuracy and must be compensated. Therefore, the mathematical model used for compensation is the determining factor in determining the accuracy of the meter. Nowadays, new products of flow meters are emerging one after another. Various new intelligent flow calculators are emerging in the instrument market. These instruments have their own technical and economic characteristics, and the compensation mathematical models used are also different.
1. Compensation for superheated steam metering
In the measurement of steam, although the density is also a function of temperature and pressure, it does not follow the ideal gas state equation, and the function relationship is different in different pressure and temperature intervals. It is difficult to express it in a simple functional relationship. Discuss the method of determining the common water vapor density.
2. Determination of density
Most of the water vapor used in the project is just off the liquid or close to the liquid, and its properties are very different from the ideal gas and should be regarded as the actual gas. The physical properties of water vapor are much more complicated than ideal gases, so they cannot be described by simple mathematical formulas. Therefore, in the past engineering calculations, the values ​​of the state parameters involving water vapor are mostly detected from the water vapor meter. The water vapor status parameter table is loaded into the instrument memory, and the amount of data is large. With the development of electronic technology, computers (or single-chip microcomputers) have been widely used in flow measurement instruments. Their storage capacity and fast calculation capability provide a powerful means for accurately and quickly determining the density of water vapor.
Key words: steam temperature and pressure compensation type flow meter, temperature and pressure integrated steam flow meter, steam flow meter, steam flow rates, steam flow meter installation, saturated steam flow meter
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