Compensation method for saturated steam

Abstract: The information on the compensation method of saturated steam is provided by the excellent flowmeter and flowmeter manufacturers. (1) Look-up table method to obtain density consistency saturated steam adopts temperature compensation and pressure compensation, which are essentially the same. The reason is that the steam in the saturated state has a single-valued function relationship between its pressure and temperature, and the density detected from the steam temperature is the same as this temperature. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the compensation method for saturated steam. (1) Look-up table method to obtain density consistency saturated steam adopts temperature compensation and pressure compensation, which are essentially the same. The reason is that the steam in the saturated state has a single-valued function relationship between its pressure and temperature, and the density detected from the steam temperature is consistent with the density detected from the pressure corresponding to this temperature. Therefore, both temperature compensation and pressure compensation are feasible in principle. (2) The difference in compensation accuracy is not only related to the accuracy of the temperature sensor and pressure transmitter, but also to the type of flowmeter, the working conditions and pressure of the specific measurement object. The range selection of the transmitter is related. Generally speaking, temperature measurement has a great influence on the compensation accuracy. The specific analysis is as follows. ①The influence of temperature measurement error on flow measurement results. The relationship between the temperature measurement error and the flow measurement result has little effect on superheated steam. For example, for superheated steam with a temperature of 250 °C, if the temperature measurement error is 1 °C, the uncertainty of the flow measurement result will be caused by the temperature compensation. is 0.19% R (vortex flowmeter). The most influential thing is that the temperature signal is used for the compensation of the saturated steam flow measurement. For example, the saturated steam with a pressure of 0.7Mpa has an equilibrium temperature of 170.5°C and a corresponding density of 4.132kg/m3. If the temperature measurement error is -1°C, And check the saturated steam density table accordingly, the density is 4.038kg/m3, which causes the flow measurement error to be about -2.27%R (vortex flowmeter). ② Consideration of the accuracy level of the temperature sensor. The temperature measurement error is related to the accuracy level of the temperature sensor and the measured temperature value. For example, the saturated steam with a pressure of 0.7Mpa is used to measure the temperature with a grade A platinum thermal resistance, and the error limit is±0.49°C [4], if this measurement result is used to check the steam density table for compensation, the flow compensation uncertainty is about±1.11% R (vortex flowmeter). And if the temperature is measured with a B-grade platinum thermal resistance, the error limit is increased to±1.15°C, the flow compensation uncertainty increases to±2.61% R (vortex flowmeter). Obviously, the error that may be caused by the use of B-grade platinum thermal resistance for such purposes is considerable, so it is generally not suitable for use. Here only the relative comparison of temperature measuring elements of different accuracy levels is made. Of course, the error mentioned here is only the part of the temperature measuring element. As for the uncertainty of the flow measurement system, the influence of the flow secondary meter, flow sensor, flow transmitter, etc. must be taken into account. ③Pressure transmitter accuracy grade, pressure measurement error and its influence. The pressure measurement error is related to the accuracy level and range of the pressure transmitter. For example, if a pressure transmitter with an accuracy of 0.2 and a measurement range of 0 to 1Mpa is used to measure the saturated steam pressure of 0.7MPa, the error limit is±2kPa. If this result is used to check the steam density table for compensation, the uncertainty of flow compensation caused by this error limit is about±0.25% R (vortex flowmeter). Obviously, pressure compensation can achieve higher compensation accuracy than temperature compensation. (4) Difficulties in specific implementation The viewpoint that the above two compensation methods are feasible is only a discussion in principle, and other problems will arise in specific implementation. ①It is difficult to install. For differential pressure flowmeters used to measure the mass flow of saturated steam, if temperature compensation is selected, the scheme is often modified because the temperature measuring sleeve is too close to the throttling piece, which interferes with the flow state or cannot be installed at the ideal position at all. ② It enters an overheated state due to phase change. For saturated steam, when it flows through the steam flowmeter (vortex flowmeter) at a higher flow rate, the adiabatic expansion caused by pressure loss tends to make the steam enter a superheated state. At this time, it is still regarded as saturated steam, and according to the steam temperature To check the saturated steam density table, the value obtained is obviously high. Due to the above reasons, when measuring the mass flow of saturated steam, only the temperature is measured, and the density table is checked accordingly to calculate the mass flow, which is not widely used in practice. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Compensation Method for Saturated Steam'

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