Issue with liquid level display in the tank
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This post was last edited by sxf1028102800 on 2018-3-29 at 14:09. The liquid ammonia tank is equipped with two level gauges: one for measuring the liquid level in the tank, and another for measuring the liquid level in the vapor space at the bottom of the tank. The liquid ammonia tank currently has a 25% liquid level; there is liquid in the tank. Why then does the liquid level in the bottom drum show over 77%, instead of 100%? I’m not quite sure; the liquid ammonia tank is used to store liquid ammonia, while the vapor drum is used to hold the separated water. Please, experts, give some advice – it will earn me extra points. As shown in the image. Thank you, extra points appreciated!
:To be honest, I don’t understand what you mean
The fact that these two canned items are different indicates that the bottom of the liquid ammonia tank is not connected to the bottom of the other tank. That’s why the level is shown in the upper tank, while only 77% level is indicated below
The liquid level indicated by liquid ammonia filling refers to the level of liquid ammonia itself, while the level measured in the vapor drum below represents the interface between liquid ammonia and water; the densities of liquid ammonia and water are different.
The original poster said that the bottom drum is used to hold the separated water; so does the 77 refer to the liquid level of water in the lower drum, while the 25 refers to the liquid level of ammonia in the tank? The level gauge at the bottom is only used to indicate the level of the separated water; otherwise, how can one know when it is necessary to drain it?
I think what this guy is saying makes sense
I don’t understand this process – why does liquid ammonia need to have water removed from it? ! What is the function of the gas-liquid pocket at the bottom of the tank, and what is its relationship with the main storage tank? And what type of flow meter should be chosen? If it’s not explained clearly, one can only hope that experts who have worked on similar designs can provide an answer
I misunderstood it yesterday. 77% refers to the liquid level height of water; using calculation software, and based on the densities of water and liquid ammonia, the pressure at the bottom of the gas holder is determined. By subtracting the pressure resulting from the liquid level measured in the liquid ammonia storage tank above, the position of the interface between water and liquid ammonia within the gas holder can be calculated
Conversely, verify whether it is what I mentioned above. Assume the height of the gas pocket is 1 meter, and the height of the liquid ammonia tank is also 1 meter. The height of water in the gas pocket is x, and the height of liquid ammonia is y. 25.8% and 77.4% represent percentages of these heights, which correspond to 0.258 meters and 0.774 meters respectively. x*1+Y*0.617=0.774*1+0.226*0.617 (x+y+0.258)*0.617=0.776 X=0.773m,y=0.227m
I’m not sure what type of level gauge you are using; one is used to measure the level of liquid ammonia, and the other is used to measure the interface between liquid ammonia and water, as their densities are different
The liquid ammonia level measured by LISA10603 uses a density of 0.617 g/cm3 for liquid ammonia. LDIA10604 measures the interface between water and liquid ammonia, with the density of water being 1 g/cm3. LDIA10604 shows 77.4% as the water level.