Rockwool International A/s

Peter Farkas Binderup Hansen

Lars Elmekilde Hansen

Lars Kresten Hansen

Leif Moeller Jensen

Lars Boellund

Andreas Leismann

Lars Bollund

Leif Moller Jensen

Guido Nykiel

The present invention relates to an apparatus and a method of making a mineral melt, the method comprising the steps of providing a circulating combustion chamber (); injecting fuel, preheated mineral material and combustion gas into the circulating combustion chamber (); combusting the fuel in the circulating combustion chamber () thereby melting the mineral material to form a mineral melt and generating exhaust gases; separating the exhaust gases from the mineral melt, collecting the mineral melt () and passing the exhaust gases () to a heat exchange system, the method being characterised in that the mineral material comprises a first mineral material and a second mineral material wherein the first mineral material has a higher sintering temperature than the second mineral material and the first and second mineral materials are provided separately to the heat exchange system, wherein the first mineral material is preheated through contact with the exhaust gases and subsequently the second mineral material is preheated through contact with the exhaust gases and the preheated first mineral material.

Process and apparatus for making a mineral melt

The invention relates to a method of making a mineral melt comprising providing a circulating combustion chamber () which comprises an upper zone (), a lower zone () and a base zone (), injecting particulate fuel, particulate mineral material and primary combustion gas which has optionally an oxygen level of at least 25% by volume into the upper zone of the circulating combustion chamber so that the fuel undergoes pyrolysis in the upper zone to produce char, thereby melting the particulate mineral materials to form a mineral melt and generating exhaust gases, injecting secondary combustion gas which has optionally an Oxygen level of at least 25% by volume into the lower zone of the circulating combustion chamber so that the char combusts, thereby completing combustion of the fuel, and separating the mineral melt from the hot exhaust gases so that the hot exhaust gases pass though an outlet in the circulating combustion chamber and the mineral melt collects in the base zone. The melt is optionally fiberized. The invention also relates to apparatus suitable for use in the method.

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Birerod, Denmark

Peter Farkas Binderup Hansen