Abstract:
Chemical treatment of bulky organic materials, in particular straw and other biomass, with volatile chemicals, such as NH3, SO2, HF, HCl, which is added to the material before, during or after a (semi)continuous compression, in particular in a piston press (1) or an extruder, and then the reaction mixture is kept enclosed and heated in a reaction chamber (6) at an elevated temperature and pressure for a period sufficient to cause the intended conversion of the material. In the treatment straw can be converted to readily digestible feeds or to fiber products for use paper or cardboard products or be pre-treated with a view to complete hydrolysis aqueous acid or enzymes.
Abstract:
In an apparatus for drying sludge and other materials of a porridge-like or paste-like consistency, said apparatus being of the kind comprising: (a) a rotating drum (1), open at both ends and adapted to be rotated about its at least roughly horizontal axis of symmetry, (b) substantially stationary means (2, 3) for introducing hot drying air into the apparatus, (c) supply means (12, 13) for introducing the material to be dried into the apparatus, and (d) separating means (4-6) for separating the material having been dried in the apparatus from the used drying air, the new feature consists in (e) such an arrangement, that the material to be dried is introduced directly onto the inside wall of the fire chamber of the apparatus, whereby the material and the drying air with a temperature of approximately 1000 DEG C are moved in co-current through the apparatus, so that the material is sterilized while at the same time being brought to give off water in the form of water vapour. With this arrangement, it is achieved partly that the material is sterilized and dried, partly that it is comminuted - especially by the use of scrapers (14) and stirring ribs (15) - so that a fine-grained dry product is produced.
Abstract:
In an apparatus for continuous heat treatment, a mechanically fluidized stream of material consisting preferably of a granular or highly viscous material is heated in a rotating chamber in co-current with heat energy originating from a burner (1), in which solid, liquid or gaseous fuel is burned. A portion of the energy liberated by the combustion heats the internal part of a thin-walled chamber (5), the external part of which at the material inlet (10) transfers energy to said stream of material in the form of radiant heat. The remaining portion of the energy liberated by the combustion, bound in the exhaust gases from the combustion process, are subjected to heat exchange in a primary convective heat exchanger (7) and one or more secondary heat exchangers (8) in counter-current with a gaseous process medium, preferably atmospheric air, said process medium transferring further energy to said stream of material in the form of convective energy.
Abstract:
In connection with heat treatments of particulate materials, primarily organic material such as grains and seeds, the particles of the material are caused to move in a floating or falling state in a treatment area (15). While floating in the treatment area, the particles are heat treated or thermally processed by emitting into the treatment area a heat flux which includes an increased proportion of radiant heat and thereby provides an intensive heating of the individual particles. A heater, in particular for use as heat source comprises at least one burner (16) which is mounted in a heater mantle (10) defining a flame chamber (12) and a heat discharge opening (14). The burner (16) is directed towards a mantle wall portion (18) which is located opposite to the heat discharge opening (14), and the inner surface of the mantle wall portion (18) consists of or is lined with a fireproof material which has the ability to glow and thereby provide heat radiation through the discharge opening (14).