C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
C10J3/72—Other features
C10J3/80—Other features with arrangements for preheating the blast or the water vapour
Procede pour la fabrication d'une surface de chauffe d'une chaudiere exempte de condensation d'eau, composee d'une enveloppe interieure et d'une enveloppe exterieure, et surface de chauffe fabriquee par ce procede