METHOD AND DEVICE FOR VACUUM DRYING OF DUNG OF FARM ANIMALS AND POULTRY Russian patent published in 1995 - IPC

FIELD: agriculture. SUBSTANCE: method involves drying the biomass at 80-125 C in a vacuum chamber. Vacuum drying permits reducing the drying temperature down to 80 C without any transformations and quality changes in the biomass. The dry mass retains heavy organic acids and the amount of emitted gases is radically reduced. Moisture and liberated gases to be neutralized are evacuated by a vacuum pump while moisture is condensed in a heat exchanger. Condensate is collected in a special container and the dehydrated gases are delivered by the vacuum pump into the suction pipe of a fan which supplies air required for combustion of fuel into a furnace which prepares a heat carrier for warming up the vacuum chamber. Fuel burns at a temperature of 1350-1500 C with an excess air coefficient of D 1.05-1.10 in presence of ammonia vapors entering together with the discharged gases thus completely neutralizing them. The throw-outs of flue gases into the atmosphere are ecologically clean. The dried biomass is collected and packed into bags. The device is comprised of a vacuum drying chamber with a furnace for burning fuel and dehydrated gases delivered from the dryer by a vacuum pump into the suction pipe of the fan supplying air for combustion in the furnace. It further comprises a heat carrier recirculating system, a vacuum system with filters, a heat exchanger for condensation of moisture produced by the drying process, a fan for blowing the heat exchanger with cold air, a vacuum pump, a condensate receiver, a system for receiving and delivering raw biomass into the drying chamber, a mechanism for conveying the dried mass along the drying chamber, a receiving hopper, mechanisms for grinding the dried mass and packing it into bags. EFFECT: improved functional and operating characteristics. 4 cl, 3 dwg