Two=stage underground gasification of coal - with preliminary partial gasification of production area from array of boreholes

Process for underground gasification of solid fuels, e.g. coal, is as follows. (I) A channel is drilled along a fuel seam, and vertical holes drilled towards it: one enters the channel at one end, and the others are spaced along it but displaced to either side alternately. (II) The area around the c...

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Bibliographische Detailangaben
1. Verfasser:	ALFEI FEDOROVICH VOLK, KIRILL NIKOLAEVICH ZVYAGINTSEV, GALI PAVLOVNA ZYBALOVA, MAIA ALEXANDROVNA KULAKOVA ET IVAN MIKHAILOVICH SAPTYKOV
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Beschreibung
Zusammenfassung:	Process for underground gasification of solid fuels, e.g. coal, is as follows. (I) A channel is drilled along a fuel seam, and vertical holes drilled towards it: one enters the channel at one end, and the others are spaced along it but displaced to either side alternately. (II) The area around the channel is gasified in sections, each to the extent of 20% (max.) by injection of the required amt. of oxidant gas (pref. O2) from each offset hole in turn through the seam to the channel. (III) Gasification is completed by a gas flow along the channel. The average calorific value of the gas and deg. of gasification are increased. Fewer channels are needed for complete gasification of a seam, so that the costs are reduced. L'INVENTION CONCERNE L'INDUSTRIE MINIERE.LE PROCEDE CONFORME A L'INVENTION EST DU TYPE COMPRENANT LA PREPARATION D'UN GENERATEUR DE GAZ PAR FORAGE, DANS LA COUCHE DE COMBUSTIBLES FOSSILES, DE FORAGE ET DE TROUS VERTICAUX CONSTITUES PAR DES TROUS PRINCIPAUX SITUES AU DEBUT DUDIT CANAL ET PAR DES TROUS INTERMEDIAIRES DISPOSES LE LONG DE L'AXE LONGITUDINAL DE CHAQUE CANAL DE FORAGE ET DE PART ET D'AUTRE DE CET AXE, ET EST CARACTERISE EN CE QUE LES TROUS VERTICAUX INTERMEDIAIRES SONT ALTERNES LE LONG DE L'AXE LONGITUDINAL DE CHAQUE CANAL DE FORAGE DE FACON QUE CHAQUE TROU SE TROUVE PAR RAPPORT A CE DERNIER DU COTE OPPOSE A CELUI OU SE SITUE LE TROU PRECEDENT, ET EN CE QUE LORS DE LA GAZEIFICATION PAR PARTIES, ON ENVOIE LE COURANT GAZEUX DANS LES TROUS INTERMEDIAIRES A TOUR DE ROLE DEPUIS L'AXE LONGITUDINAL DU CANAL DE FORAGE ET PENDANT LE TEMPS NECESSAIRE A LA GAZEIFICATION DE 20, AU MAXIMUM, DES RESERVES DE COMBUSTIBLES FOSSILES DE CHAQUE PARTIE DU CANAL DE FORAGE ET ASSURANT LA PREPARATION THERMIQUE DE LA COUCHE.LE PROCEDE EN QUESTION PERMET NOTAMMENT D'OBTENIR UN GAZ A POUVOIR CALORIFIQUE PLUS ELEVE ET D'ASSURER EN MEME TEMPS L'UTILISATION MAXIMALE DES RESERVES DE COMBUSTIBLE FOSSILE.