Gas storage method and product

C - Chemistry – Metallurgy – 10 – L

Patent

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Details

C10L 3/06 (2006.01) C10L 3/00 (2006.01) F15D 1/02 (2006.01) F17D 1/02 (2006.01)

Patent

CA 2205678

For storage of natural gas at pressures over 1,000 psia, it is advantageous to add to natural gas an additive which is a C2 or C3 hydrocarbon compound, or a mixture of such hydrocarbon compounds. Above a lower limit (which varies with the additive being added and the pressure), a decrease in the amount of power needed to compress the mixture. For storage or pipeline transportation of natural gas at pressures over 800 psia, it is advantageous to add ammonia to the natural gas, in an amount such that the ammonia does not create a liquid phase at the temperature and pressure used. The ammonia-natural gas mixture can be compressed or pumped with a lower energy expenditure than would be needed for an equivalent volume of natural gas alone. When more than 4% by volume of ammonia is present, the pumping through pipelines is also aided by the refrigerant effect of the ammonia, which reduces the temperature of the gas being transported. Instead of ammonia, hydrogen fluoride or carbon monoxide can be added to the natural gas, but these are less preferred than ammonia.

Pour l'entreposage du gaz naturel à des pressions supérieures à 1 000 livres par pouce carré, il est avantageux d'ajouter au gaz naturel un additif qui peut être soit un mélange d'hydrocarbures en C2 ou C3 ou un mélange de ces mélanges d'hydrocarbures. Au-dessus d'une limite inférieure (qui varie en fonction de l'additif utilisé et de la pression), il y a diminution de la quantité d'énergie nécessaire pour comprimer le mélange. Pour stocker ou transporter par pipeline du gaz naturel à des pressions de plus de 800 livres par pouce carré, il est avantageux d'ajouter de l'ammoniac au gaz naturel en quantité telle que la présence d'ammoniac ne provoque pas la liquéfaction du gaz naturel à la température et à la pression utilisées. Pour comprimer ou pomper un mélange de gaz naturel et d'ammoniac, il faut moins d'énergie que pour traiter un volume de gaz naturel seulement. Lorsque l'ammoniac représente plus de 4 % du volume du mélange, le pompage dans le pipeline est également facilité par l'effet réfrigérant de l'ammoniac qui réduit la température du gaz à transporter.On peut remplacer l'ammoniac comme additif au gaz naturel par du fluorure d'hydrogène ou de monoxyde de carbone, mais il est préférable d'utiliser de l'ammoniac plutôt que ces produits.

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