Ethanol at minus 50℃ is stored in normal pressure vertical containers (about 3m3)
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This post was last edited by ljy3033 on 2018-2-28 15:06 Is it feasible to store ethanol at minus 50°C in a normal pressure vertical container (about 3m3)? Used for circulating refrigerant. In addition, I used Aspen to simulate the saturated vapor pressure of ethanol at minus 50°C. It is very small (see picture). I feel that the breathing valve can be canceled and a breather pipe can be directly installed. But in this case, will a large amount of cold energy be lost from the breather pipe, and the mouth of the pipe may freeze to death in rainy days?
How to control the volatility of ethanol at normal pressure and low temperature? A little suggestion
Doesn’t ethanol just vaporize and be discharged through the breathing valve?
The loss will not be huge and can be accepted. Petrochemical regulations require that fixed roof tanks for Class A, B and B liquids should be equipped with flame arresters and breathing valves. Do you have any good suggestions?
Can simple cold preservation meet the -50℃ requirement? Do I need to add a vacuum barrier? Is nitrogen sealing added?
This post was last edited by ljy3033 on 2018-2-28 10:30. Can simple cold preservation meet the -50℃ requirement? ---I'm not sure about this, but I checked the information and found that the cold insulation of pipes can reach minus 100 degrees. Do I need to add a vacuum barrier? ---I read the GBT 18442-2011 Low-temperature Insulated Pressure Vessel Specification. The specification requires that the working pressure is not less than 0.1MPa, which means that the storage tank must be pressurized, not normal pressure. As an ethanol storage tank, it is not necessary to design it to be pressurized. Moreover, the storage media targeted by the specification are all liquefied gases (liquid nitrogen, liquid oxygen, etc.). Is nitrogen sealing added? ---After all, ethanol is not a poisonous and harmful liquid, so you can add a breathing valve.
This is how refrigeration units work. The outer casing is insulated and the top cover is covered with a hollow cover to reduce heat loss.
Is the hollow cover you are talking about covering the refrigeration unit? The refrigeration unit needs to be purchased as a complete set. A 3m3 cold ethanol storage tank is prepared for the refrigeration unit (and then a separate pump is used to send the cold ethanol in the storage tank to the required equipment). What I want to ask is if this 3m3 cold ethanol storage tank can be made into a normal pressure container (polyurethane cold insulation), can the cooling capacity be maintained? In addition, I used Aspen to simulate the saturated vapor pressure of ethanol at minus 50°C. It is very small (see the supplementary picture on the first floor). I feel that the breathing valve can be eliminated and a breather pipe can be directly installed. But with such a change, will a large amount of cold energy be lost from the breather pipe, and may the mouth of the pipe freeze to death in rainy days?
We have a 1m3 circulation tank with a temperature of -55°C. It is equipped by a refrigerator manufacturer. It has a vacuum jacket on the outside and foam insulation inside. It doesn’t lose much heat and no ice can form on the outer wall.
Does your 1m3 circulating tank have a breathing valve on the top? If so, will it not freeze here?