How to solve the vaporization phenomenon in liquid ammonia flow measurement

In order to avoid vaporization during liquid ammonia flow measurement, the following design and installation methods will be effective. ① Choose an instrument with a small pressure loss. For example, there is a liquid ammonia flow measurement object whose maximum flow rate is Hua! !!3/!!, the maximum pressure loss of 1)^50 vortex flowmeter is 0』21^? 3. Compared with the selection, the pressure loss of the 50 turbine flowmeter (for ^). 025IV[? ? 0 small. ② Reasonably choose the installation location. The installation position of the flow sensor should be selected on the outlet pipe at the bottom of the tank. Under the premise of ensuring the straight pipe section, it should be as close as possible to the outlet of the tank. In this way, during the transportation of liquid ammonia, heat absorption from the atmosphere through the transportation pipeline can be reduced. At the same time, the installation position should be as low as possible, which can increase the depth of supercooling. ③ Install the regulating valve behind the flow meter. In the process shown in Fig. 3, 52, there is a large pressure difference between the ammonia intermediate tank and the ammonia separator, and most of the pressure difference falls on the regulating valve. When liquid ammonia flows through this valve, the pressure suddenly drops, and a certain amount of liquid vaporizes, thus a gas-liquid two-phase flow occurs. In order to avoid two-phase flow in the fluid flowing through the flowmeter, the throttle valve must be installed downstream of the flowmeter. If the liquid phase outlet of the ammonia separator is equipped with a shut-off valve, the shut-off valve must be fully opened during normal measurement. In the field, when the cut-off valve is gradually closed, the flowmeter indication value not only does not drop but rises sharply. It is because the liquid ammonia vaporizes rapidly and the volume expands tens to hundreds of times after the cut-off is closed. As a result, the output of the speed flow meter whose output is proportional to the volume flow suddenly rises, and a short-term false indication appears.

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