Heat exchanger for rapid cooling of gas - which is fed up water:cooled tubes which are periodically de:coked by steam under conditions minimising thermal shock

The vertical exchanger has a bottom inlet and a top outlet for gas, and a bottom boiling chamber connected by a bundle of tubes to a top boiling chamber; both chambers are made of thin plates, Inside each tube is a coaxial tube through which the gas flows upwards; whereas a coolant, e.g. pressurised...

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Bibliographische Detailangaben
1. Verfasser:	TAKAO ONUKI, SHIGERU KEZOBO, RITSUO HASHIMOTO, TOSHIRO OKAMOTO, KAZUMICHI HIRAMATSU, NOBUHIRO SAKAGUCHI ET TAKESHI WATANABE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BLASTING CHEMISTRY CRACKING HYDROCARBON OILS FUELS HEAT EXCHANGE IN GENERAL HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT HEATING LIGHTING LUBRICANTS MECHANICAL ENGINEERING METALLURGY METHODS OF STEAM GENERATION MINERAL WAXES PEAT PETROLEUM, GAS OR COKE INDUSTRIES PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS REFORMING OF NAPHTHA STEAM BOILERS STEAM GENERATION TECHNICAL GASES CONTAINING CARBON MONOXIDE WEAPONS
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Beschreibung
Zusammenfassung:	The vertical exchanger has a bottom inlet and a top outlet for gas, and a bottom boiling chamber connected by a bundle of tubes to a top boiling chamber; both chambers are made of thin plates, Inside each tube is a coaxial tube through which the gas flows upwards; whereas a coolant, e.g. pressurised water, flows up the annular gap between tubes. The bundle of double tubes is surrounded by a thermally-insulating casing. The exchanger is pref. used in conjunction with a cracking furnace, and steam or steam and air are periodically fed up tubes at max. 750 deg.C to remove coke which has deposited inside tubes. The coolant is removed from tubes to control the temp. of the decoking operation, which may be simultaneously employed for decoking the cracking furnace. Thermal stresses on the tubes are reduced. L'INVENTION CONCERNE LES ECHANGEURS DE CHALEUR.LE PROBLEME POSE CONSISTE A PERMETTRE L'ENLEVEMENT D'UN DEPOT RESULTANT D'UNE COMBUSTION.SUIVANT L'INVENTION, UN TEL ECHANGEUR COMPREND DES CHAMBRES D'EBULLITION 32, 34 EN FORME DE TAMBOUR, FORMEES PAR DES PLAQUES 45, 45, 51, 51 AYANT UNE EPAISSEUR DE PAROI FAIBLE ET DISPOSEES DU COTE DE L'ENTREE DE GAZ A LA PARTIE SUPERIEURE, UN GROUPE DE TUBES DOUBLES 35 PLACES ENTRE LES CHAMBRES D'EBULLITION INFERIEURE ET SUPERIEURE, ET UN CORPS D'ISOLATION THERMIQUE 36 PLACE AUTOUR DU GROUPE DE TUBES DOUBLES.L'INVENTION TROUVE UNE APPLICATION PARTICULIERE DANS L'INDUSTRIE DU PETROLE.