METHOD AND DEVICE FOR THERMAL BIOLOGICAL BREAKDOWN AND DEWATERING OF BIOMASS

摘要

A method is described for thermal biological breakdown and dewatering of biomass, which is characterised in that it comprises the following steps:
lead the biological residue material (8) from a digesting tank (6) to a dewatering device (9) and dewater the material to typically 15-25% dry matter,lead the dewatered material (10) to a device (12) and carry out a thermal hydrolysis at typically 145-170° C. for typically 10-40 minutes,subject the hydrolysed biomass (14) to a quick pressure reduction that results in a steam explosion in the biomass,dewater the thermally hydrolysed and steam exploded hot biomass (14), at typically 85-105° C. in a closed dewatering unit (16), typically a centrifuge, to typically 35-60% dry matter,cool the dewatered biomass (18) in a cooler (19), preferably an air-cooler and dewater the biomass further by evaporation to typically 40-75% dry matter,lead the liquid phase (17) from the dewatering unit (16), which contains considerable amounts of hydrolysed organic matter and heat upstream of the digesting tank (6) for increased production of biogas.

Also described is a device to carry out the method.

主权项

1. A method for thermal biological breakdown and dewatering of biomass, the method comprising:
leading the biological residue material from a digesting tank to a dewatering device and dewatering the material to a typical 15-25% dry matter; leading the dewatered material to a device and carrying out a thermal hydrolysis at a typical 145-170° C. for typically 10-40 minutes; subjecting the hydrolysed biomass to a quick pressure reduction that results in a steam explosion in the biomass; dewatering the thermally hydrolysed and steam exploded hot biomass, typically at 85-105° C. in a closed dewatering unit, typically a centrifuge, to typically 35-60% dry matter; cooling the dewatered biomass in a cooler, preferably an air-cooler and dewatering the biomass further by evaporation to typically 40-75% dry matter; and leading the liquid phase from the dewatering unit, which contains considerable amounts of hydrolysed organic matter upstream of the digesting tank for increased production of biogas.