Storage and Transportation Technology: [Weekly Topic] 11-7-5 to 7-10 – Calculation of the cycling heating time for crude oil storage tanks
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This post was last edited by flute6 on 2011-7-5 23:18. How is the circulation heating time for crude oil storage tanks calculated, and what data is required? Calculation method? For a tank with a capacity of 100,000 m³ that is currently full, assuming the storage temperature is 20 degrees Celsius and it needs to be raised to 30 degrees Celsius, the temperature of the crude oil circulating out of the heat exchanger is 33 degrees Celsius with a flow rate of 1200 m³/h. How long will it take to raise the temperature of the tank to 30 degrees Celsius? What more data is needed? How to calculate it? I hope experts will kindly offer their guidance! Those who actively participate in technical exchanges will be rewarded!
This also requires pressure, the material of the storage tank, and the medium used as the heat transfer fluid.
I would like to know too; please, experts, provide an example explanation
This should fall under chemical engineering thermodynamics; the original poster should ask their question regarding heat exchangers, and I think they will receive a satisfactory answer.
How do I calculate it? Does anyone know how to help me out?
This is a calculation of a unsteady heat transfer process. Input heat 1 – Output heat 2 = Accumulated heat 3. Formulate heat calculation equations for 1, 2, and 3 respectively to carry out the calculations, and finally, integrate with respect to time based on the temperature boundary conditions. Find the time to reach the boundary condition. Among them, 1 and 3 are relatively easy to calculate, while 2 is the most difficult: because the heat dissipation process itself is a unsteady-state process, and moreover unsteady-state heat transfer calculations must be carried out for the tank. There’s no need to rush; I’ll calculate it for you when I’m free.
Input heat 1 – Output heat 2 = Accumulated heat 3 + Heat dissipation
The diameter and height of the storage tank, as well as the height of its roof; the physical properties of crude oil, such as Cp, density, and viscosity; the thermal conductivity and thickness of the insulation layer; the emissivity of the surface coating; the temperature difference of the circulating oil, along with its Cp value, enthalpy, or density. Additionally, the wind speed during winter in that area, and the average temperature during the coldest months is also necessary.
There are theoretical algorithms for this, but they also need to be combined with actual operating conditions such as weather, initial oil temperature and quality, and whether the oil supply is continuous or intermittent; the most practical approach is to use empirical formulas.
The heating medium also varies, such as whether it is steam or heat transfer oil.