Installation, used to roast food grain e.g. coffee bean, includes combustion device, gas-solid separation unit, gas turbine system, gas-gas heat exchanger, roasting device, cooling unit, membrane filtration unit, and deacidification device
The installation comprises a combustion device (1) for combustion of biomass to produce combustion gas, a gas-solid separation unit (3a) for purifying the combustion gas, a gas turbine system (5) for producing electricity from the combustion gas, a gas-gas heat exchanger (7) for heating a feed gas from the combustion gas, a roasting device for roasting food grains from the feed gas and for producing roasting gas, a cooling unit (11) for cooling the roasted food grain, and a membrane filtration unit for treating the feed gas and roasting gas from the cooling unit to produce purified gas. The installation comprises a combustion device (1) for combustion of biomass to produce combustion gas, a gas-solid separation unit (3a) for purifying the combustion gas, a gas turbine system (5) for producing electricity from the combustion gas, a gas-gas heat exchanger (7) for heating a feed gas from the combustion gas, a roasting device for roasting food grains from the feed gas and for producing roasting gas, a cooling unit (11) for cooling the roasted food grain, a membrane filtration unit for treating the feed gas and roasting gas from the cooling unit to produce purified gas, and a deacidification device for processing the purified gas and for producing a poor gaseous effluent in acid gases. The gaseous effluent is recycled to form a portion of the feed gas used in the roasting device. The biomass is adapted to produce fuel including products of cellulose or lignocellulose such as wood and/or by-products from agriculture including straw, olive pomace and pomace dates. The installation further comprises a unit for heating fuel from biomass positioned in an upstream of the combustion device. An independent claim is included for a method for roasting food grains such as coffee beans.L'invention concerne une installation de torréfaction et un procédé de torréfaction de graines alimentaires. L'installation comprend au moins un dispositif de combustion d'un combustible issu de la bi
