POSSIBLE THERMAL PROCESSES INVOLVED IN THE STORAGE OF LIQUEFIED PETROLEUM GAS

Autor/autori: Assoc. Prof. PhD. Eng. Tudora CRISTESCU, Prof. PhD. Eng. Laz?r AVRAM, Assist. PhD. Eng.Monica Emanuela STOICA


Abstract: Liquefaction has become widespread as a result of its favorable economic effects that are achieved by significantly reducing the required storage and transport volumes. LPG are substances which at ambient temperature and atmospheric pressure are normally gaseous, consisting mainly of any of the following hydrocarbons or a mixture of these: propane, propylene, butane and butylene. They can be liquefied by increasing the pressure or by lowering the temperature or by a combination of thereof. The heat absorbed by liquefied hydrocarbon gas produces vaporisation of a quantity of liquid that is discharged in order to keep the pressure to the level required for a safe operation of the container. By vaporisation, heat is absorbed resulting the cooling of the remaining mass of liquid. If the use of the gas takes place continuously, then, also the cooling of the liquid mass is increased and the liquid in the reservoir receives just a little heat from the environment. In this case, the value of steam pressure decreases and leads to cessation of gas emission. Resumption of gas consumption can start only after restoration of the equilibrium state.

Keywords: heat transfer coefficients, spherical tanks, insulation.

 

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