Gas compressor

F - Mech Eng,Light,Heat,Weapons – 04 – D

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Details

F04D 29/14 (2006.01) F04D 29/12 (2006.01)

Patent

CA 2352812

To avoid formation of condensate or freezing in the tandem gas seals (12, 13) of a gas compressor (1), such as for use in the compression of production of natural gas, when the compressor is temporarily stopped for maintenance or repair of the compressor or instrumentation, the settle out pressure (SOP) in the high pressure gas discharge line (7) from the compressor (1), arising from equalising the inlet and outlet gas pressures, is directed to cause gas to flow through a branch line (25) to the outboard gas seal (13), the gas being heated by an electrical heating coil (28) and its pressure being reduced in a controlled manner. In this way, the gas is prevented from entering its liquid- vapour phase, so that no condensate can form in the inboard and outboard gas seals (12, 13).

Afin d'éviter une formation de condensat ou le gel des joints de gaz tandem (12, 13) d'un compresseur à gaz (1), s'utilisant par exemple dans des opérations de compression pour la production de gaz naturel, lors de l'arrêt temporaire du compresseur pour des raisons d'entretien ou de réparation du compresseur ou des instruments, on se sert de la pression de sortie (SOP) dans la conduite de décharge de gaz haute pression (7) provenant du compresseur (1), qui résulte de l'égalisation des pressions d'entrée et de sortie de gaz, pour faire passer l'écoulement de gaz par une conduite secondaire (25) vers le joint de gaz extérieur (13), le gaz étant chauffé par un serpentin chauffant électrique (28) et sa pression réduite de manière contrôlée. De cette manière, on empêche le gaz d'atteindre sa phase liquide-vapeur de sorte qu'aucun condensat ne peut se former dans les joints de gaz intérieur et extérieur (12, 13).

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