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METHOD AND APPARATUS FOR INCREASING THE CALORIFIC VALUE OF SOLID CARBONACEOUS MATERIALS BY INJECTING PRESSURISED GAS INTO A HEAT EXCHANGE TUBE CONTAINING GRANULAR CARBONACEOUS MATERIAL WHICH IS HEATED TO AN ELEVATED TEMPERATURE
METHOD AND APPARATUS FOR INCREASING THE CALORIFIC VALUE OF SOLID CARBONACEOUS MATERIALS BY INJECTING PRESSURISED GAS INTO A HEAT EXCHANGE TUBE CONTAINING GRANULAR CARBONACEOUS MATERIAL WHICH IS HEATED TO AN ELEVATED TEMPERATURE