Vapour recovery system principle

What is Vapour recovery system (VRU)

Vapor recovery systems use the highly versatile and efficient process of adsorbing hydrocarbons onto activated carbon and The adsorbed hydrocarbons are recovered from the activated carbon through the use of a vacuum pump system and re-absorbed into a circulated stream of absorbent, returning the hydrocarbons back to the loading operation or storage facility. 

Why Gasoline Vapour should be recovered?

The transfer of gasoline to truck / rail at terminals is a major source of release of gasoline vapour to atmosphere. Gasoline vapour contains aromatic hydrocarbon such as Benzene as well as aliphatic hydrocarbons.Benzene is proved to be carcinogenic. There covery unit drastically reduces the Volatile Organic Compound (VOC) there by creating safe environment. Jt be comes economically beneficial on account of value of recovered gasoline. Drastic reduction in VOC content in air will also reduce the risk of fire/explosion.

Process of Vapour recovery system terminal

Hydrocarbon vapors, generated from truck loading, enter into one of two carbon adsorbers. The hydrocarbon and air vapors flow through the adsorber where the bulk of the hydrocarbons are adsorbed. The air continues through the carbon adsorber and is vented to the atmosphere. While this carbon adsorber is on-line processing the hydrocarbon vapors, the second carbon adsorber is off-line being vacuum regenerated (i.e. cleaned). The purpose of regeneration is to restore the carbon to a level where it will effectively adsorb hydrocarbons again. The two carbon adsorbers alternate between adsorption and regeneration at @15- 20 minute intervals.

When a carbon adsorber is being regenerated, the vacuum pump exerts a significant vacuum on the carbon adsorber vessel and desorbs the hydrocarbons from the carbon. The hydrocarbon vapors are then pumped from the carbon to the absorber tower.

The hydrocarbons are condensed and absorbed by the counter flow liquid gasoline feed in the absorber tower and are then pumped back to the terminal’s gasoline storage tank. Any hydrocarbons that are not absorbed in the absorber tower pass up through the packed tower and are routed back to the on-line carbon adsorber.

Advantage of vapour recovery system :-

  • Removal upto 99.98% of hydro carbon content from the exhaust air.
  • Elimination of gasoline vapour from the exhaust air prevents health hazards.
  • Minimization of fire or explosion risk due to reduced hydrocarbon vapour in atmosphere.
  • No generation of pollutant during operation. Economic benefits from recovered gasoline.

Application of vapour recovery system :-

  • Loading of petrol in truck 
  • Loading of petrol in truck 
  • Petrol refilling at car at filling station

 

 Shape of the nozzle  that it recovers petrol vapour ?

 

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