Patent ID: 11965651
Assignee: JORGE LUIS OSóRIO CARVALHO
Field: Chemical engineering (Chemistry)
Classification: CPC F  B  Y | IPC B  F

Claim 0:
1. A process for obtaining dry biomass upon treating organic waste through two drying steps, characterized by comprising continuous steps, said steps being controlled using controllers, said controllers adjusting load quantity, firing temperature, passage speed and negative pressure to be employed, the process comprising:
continuously transporting wet waste through conveyor belts containing mostly organic waste, previously sieved and crushed, dumping them into a first inlet located at one end of a first rotating cylindrical dryer conducting waste towards a first dryer outlet located at the other end thereof, an interior of the first rotating cylindrical dryer showing temperatures, generated by supply of hot air, between 250° C. and 300° C. at the first inlet of the first rotating cylindrical dryer and between 90° C. and 100° C. at the first dryer outlet thereof of the first rotating cylindrical dryer;
subjecting the waste to pre-drying treatment during a first dwell time in their displacement in the first rotating cylindrical dryer, between 20 and 30 minutes, removing above 50% of wet load present in the waste by creating negative pressure at the first dryer outlet resulting in flow of hot air;
removing from the interior of the first rotating cylindrical dryer during the pre-drying treatment, the wet load released in the form of steam through a first exhaust duct positioned near the first dryer outlet of the first rotating cylindrical dryer;
dumping pre-dried waste on a conveyor belt where it will move at room temperature, being cooled down during a dwell time, which will be between 20 and 30 minutes, and dumping the pre-dried waste continuously into a second inlet of a second rotating cylindrical dryer, an interior of the second rotating cylindrical dryer showing temperatures, generated by supplying hot air, between 180° C. and 200° C. at the second inlet thereof and between 75° C. and 85° C. at a second dryer outlet thereof of the second rotating cylindrical dryer;
carrying pre-dried waste through the second rotating cylindrical dryer for a second dwell time around 20 minutes, subjecting it to final drying, removing remaining wet load present in the waste by creating negative pressure at the second dryer outlet resulting in flow of hot air;
removing from the interior of the second rotating cylindrical dryer during the final drying step, the remainder of the wet load is released in the form of steam through a second exhaust duct provided near the second dryer outlet of the second rotating cylindrical dryer; and
transporting biomass resulting from the previous steps to a storage silo said process further comprising cooling while transportation of the biomass through a passage between the first rotating cylindrical dryer and the second rotating cylindrical dryer, and between the second rotating cylindrical dryer and the storage silo, wherein the cooling is obtained by passage of a cooling element absorbing heat from the biomass as the biomass is in transit.