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Machine translation
1. (WO1979000395) SYSTEM FOR PREVENTING GAS DECOMPOSITION IN PIPELINES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1979/000395    International Application No.:    PCT/US1978/000217
Publication Date: 12.07.1979 International Filing Date: 14.12.1978
IPC:
C07C 11/04 (2006.01), F16L 55/00 (2006.01), F17D 1/02 (2006.01)
Applicants:
Inventors:
Priority Data:
860791 15.12.1977 US
Title (EN) SYSTEM FOR PREVENTING GAS DECOMPOSITION IN PIPELINES
(FR) DISPOSITIF POUR EVITER LA DECOMPOSITION DU GAZ DANS UN GAZODUC
Abstract: front page image
(EN)In a system in which compressed ethylene is scheduled to flow through pipes, and in which there is danger of decomposition of ethylene and danger of the spreading of a reaction boundary of the exotheric decomposition reaction, a method and means are provided for quenching the advancement of the decomposition. Ethylene is directed from large diameter pipes (151) into an array of spaced apart small diameter tubes (153) which are not overheated when subjected to the combination of head and tail boundaries of the advancing plug of decomposition products. Such overheating of the tubes by the leading and trailing flames can be prevented by cooling the exterior of the tubes with a fluid (152) normally maintained at about ambient temperature, thereby cooling the compressed ethylene sufficiently to quench the decomposition reaction. The cooling fluid is desirably an aqueous system adapted to be convened to steam under severe conditions. A significant depth of liquid is normally maintained above the upper strata of tubes (153) in the reaction boundary suppressors so that the total cooling capacity of the liquid, before evaporation exposes an upper strata of tubes, is significantly greater than in the dormant liquid of a heat exchanger of conventional design. This system of quenching reactions has applicability to facilities featuring the flow of gases other than ethylene. The system comprising the piping for the compressed gas includes such reaction boundary suppressors at locations appropriate for protecting critical zones of compressed gas from the hazard of the advancement of an undesired accidental reaction.
(FR)Dans une installation dans laquelle de l"ethylene comprime est envoye a travers des tuyaux et dans laquelle il existe un danger de de composition de l"ethylene et un danger de propagation de la lim ite de la reaction de decomposition exothermique, on fournit un procede et un moyen pour arreter l"avancement de la decomposition. De l"ethylene est dirige a partir de tubes (151) de grand diametre dans un ensemble de tubes (152) de plus petit diametre, qui ne seront pas surchauffes lorsqu"ils sont soumis a la combinaison des limites de tete et de derriere du bouchon en progression de produits decomposes. Une pareille surchauffe des tubes causee par les flammes de tete et de derriere peut etre evitee en refroidissant la surface exterieure des tubes au moyen d"un fluide (152) maintenu normalement a la temperature ambiante. Ainsi, on refroidit l"ethylene comprime de facon suffisante pour arreter la reaction de decomposition. Le fluide de refroidissement est avantageusement aqueux et est susceptible d"etre transforme en vapeur dans des conditions de travail severes. On maintient normalement une hauteur de fluide considerable au-dessus de la couche superieure des tubes (153) de facon que la capacite de refroidissement totale du liquide, avant que l"evaporation denude la couche superieure des tubes, soit considerablement plus grande que dans un echangeur de chaleur classique. Cette facon de supprimer les reactions peut etre appliquee a des installations qui transportent d"autres gaz que l"ethylene. L"installation pour le transport de gaz comprime comprend de tels suppresseurs situes a des endroits appropries pour proteger des zones critiques le gaz comprime contre le danger du declenchement d"une reaction accidentelle non desiree.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)