Measurement of High Saturated Vapor Pressure Liquid Flow Rate

Measurement of High Saturated Vapor Pressure Liquid Flow This section takes liquid ammonia as an example to discuss the measurement of high saturated vapor pressure liquid flow such as ethylene, propylene, and vinyl chloride. There are two major differences between liquid ammonia flow measurement and the water flow measurement and oil flow measurement discussed above. One is that the saturated vapor pressure of liquid ammonia is high, and its boiling point is -33.41 under standard atmospheric pressure conditions, so it must be transported and stored under pressure conditions. Second, in the flow measurement of this kind of fluid, it is easy to generate cavitation and accompanying cavitation phenomenon at the outlet of the flowmeter due to the pressure loss of the instrument, resulting in high indication value of the flowmeter and damage to the flow primary device. The situation encountered in the flow measurement of liquid ethylene, propylene, etc. is also the same. This section analyzes the problems encountered in liquid ammonia flow measurement and their solutions, which is also of reference value for flow measurement of other liquids with higher saturated vapor pressure. (Working) Characteristics of liquid ammonia flow measurement ① The gas-liquid interface of liquid ammonia stored in the storage tank is generally in a state of gas-liquid equilibrium. Fig. 3, 52 shows a typical process flow measurement of liquid ammonia in storage in an ammonia plant. The synthesis gas, gaseous ammonia, and liquid ammonia mixture from the ammonia condenser are separated in the ammonia separator, and the liquid ammonia is sent to the low-pressure ammonia intermediate tank through the flow meter and the liquid level regulating valve. Obviously, at the gas-liquid interface between the ammonia separator and the middle tank in the figure, both gas-liquid phases are in equilibrium. Liquid ammonia flow measurement should try to avoid two-phase flow. However, if the liquid ammonia close to the gas-liquid equilibrium state flows through the flowmeter, if the pressure head loss is large, it will easily cause partial vaporization and affect the measurement accuracy. ② The temperature coefficient of fluid density is relatively large. From the ^^/(?) function table of liquid ammonia, it can be seen that under normal temperature conditions, the temperature of liquid ammonia changes by 11, and its density changes by more than 0, 2^. Therefore, liquid ammonia metering must be temperature compensated. ③ High precision requirements. According to the requirements of the relevant documents of the former Ministry of Chemical Industry, the measurement of liquid ammonia should reach the level 1 accuracy. If effective measures are not taken, it will be difficult to meet this requirement. ④ The fluid is flammable and explosive. Explosion-proof instruments should be selected when selecting instruments, and explosion-proof regulations should be followed during instrument installation, use and maintenance.

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