Calculations related to pre-cooling in low-temperature tanks
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Pre-cooling of the cryogenic tank is achieved by using liquid propane that vaporizes inside the tank, absorbing heat in the process. To better control the uniformity of the cooling rate of the cryogenic tank, it is necessary to perform calculations regarding the amount of liquid fed in and the temperature drop of the storage tank. Assume that the volume of the low-temperature tank is 120,000 cubic meters, the temperature drop needs to be controlled at 3 degrees Celsius per hour, and the pressure is to be kept constant at 8 KPa. How can we then calculate the amount of propane liquid that enters the tank per hour?
If anyone has experience in this area, it would be great if they could share a calculation formula.
First, I won’t do the calculations for now; I need to look up some information. I think it’s necessary to specify the type of storage tank, its insulation properties, the location of the feed inlet, the gasification rate, and so on.
The storage tank consists of a concrete outer shell and an inner shell made of low-temperature carbon steel; feeding is carried out through spraying vaporization from the top of the tank, and the tank is constructed using foam glass bricks and expanded perlite.
The volume is 120,000 cubic meters – what kind of reservoir is this that’s so large? Heat balance calculations are necessary; the heat of vaporization is considered as a cold source, while the cooled medium and the environment act as heat sources. Additionally, the heat exchange rate must also be taken into account
But could you provide a specific calculation formula?
Moderator, have you found a method for calculating the pre-cooling of cryogenic tanks? Could you share it with me to learn*learn*?
On my end, the propane gas phase in the storage tank is cooled by the heat absorbed during the vaporization of liquid propane at room temperature as it enters the tank. What I want to do is calculate the flow rate of liquid propane at room temperature per hour that is necessary to ensure complete vaporization.
I haven’t found it yet; I haven’t had time to visit the forum lately. I’ll look for it when I have time.
It doesn’t make sense; it should be controlled based on the amount of gasification rather than the amount of liquid fed in. Although some controls appear to be based on the flow rate of liquid input, in reality, since the vaporization conditions do not need to be controlled, the amount of vaporization is regulated by the flow rate of liquid input. In fact, the function of the tank you described is also incorrect; it is likely to be a vaporizer rather than a storage tank. The liquid propane passes through this vaporizer and is completely vaporized, but its processing capacity is unknown. You want to know how much feed is required to ensure complete vaporization