Patent DE-102008038502-A1 (DE)
Title: Method for generating and distributing energies by using lignocellulose-containing raw material, by delivering the raw material into a station, and pretreating and processing the raw material to liquid fermentation substrate in the station
Inventor: FREINECKER DIETER
IPC: C12P5/02
Filed: 2008-08-20
Abstract: The process comprises delivering lignocellulose-containing raw material into a first station, pretreating and processing the raw material to a liquid fermentation substrate in the first station, supplying the fermentation substrate to a biogasification process (3) in a second station, and converting biogas (4) obtained from the biogasification process into energy form such as electrical energies, heat energies or chemical energies transportable and/or conductible over larger distances in a third station. The raw material consists of cellulose- and lignocellulose-containing biomass (2). The process comprises delivering lignocellulose-containing raw material into a first station, pretreating and processing the raw material to a liquid fermentation substrate in the first station, supplying the fermentation substrate to a biogasification process (3) in a second station, and converting biogas (4) obtained from the biogasification process into energy form such as electrical energies, heat energies or chemical energies transportable and/or conductible over larger distances in a third station. The raw material consists of cellulose- and lignocellulose-containing biomass (2) of any form such as grasses, grains, algae, reeds, woods, wood refuse and/or rind and/or animal excrements. The second station is spatially separated from the first station. The pretreating and processing step comprises sorting, releasing impurities, decomposing raw material and biological treatment. The decomposition of the raw material is a crushing process and a defibering process, where the surface of the obtained raw material particle is enlarged to 2-1000 times against the surface of the original raw material. The raw material is crushed to a length of 0.2-3 mm. The protein embedded in the raw material is recovered before or after pretreating and processing. The protein recovery comprises cutting and milling the raw material, pressing the cut and milled raw material, cleaning the obtained sap, heating the obtained sap at 90[deg] C, and decanting the protein. The raw material temperature is -5[deg] C to 50[deg] C in entry region and 35-85[deg] C in the exit region during pretreating. The processing of the pretreated raw material takes place by hydrolytic liquefaction, which is induced by enzymes (9) and/or thermophilic bacterial cultures. The solid content during the processing is 5-50% related to the dry substance mass of the used raw material. The pH-value of the fermentation substrate during the biogasification process is 6-8. The over-pressure inside the second station is 0.01-7 bar against the atmospheric constant during the biogasification process. The obtained biogas is dehumidified and is separated from carbon dioxide by pressure swing adsorption. The biogas in the third station is supplied to a force heat coupling. The biogas is injected into a gas pipeline network. An independent claim is included for a device for preheating cellulose-containing raw material for a biogasification.