Abstract: A continuous boiling apparatus (1) for organic materials, e.g., fish or offal from abattoirs, comprises at least one annular boiling zone (15) with an inlet opening (13) for the raw material and a discharge opening (4) for the heat-treated raw material. The annular boiling zone (15) is defined by circular, con-centric heating plates (5), each made up of circular, con-centric parts (6, 7) between which a heating medium is introduced (8). In the boiling zone (15) there are provided a number of feeding elements (10) with self-regulating scrapers (16) which lie up against heating surfaces (6) and divide the boiling zone (15) into sub-zones.

Abstract: Method for producing hot drying gas by a burning flowable biological refuse in an incinerator which comprises a vertical cyclone furnace. Fuel together with primary combustion air is tangentially injected into the vertical cyclone furnace, and secondary combustion air and tertiary combustion air are injected into a throat. A cooled rotating ash scrapper is provided in the bottom of the vertical cyclone furnace and waste gas is conducted through the throat to a secondary combustion chamber in which an incineration of residuals takes place and from which a drying gas is removed. A combustion retarding gas is injected into the hottest area of the vertical cyclone furnace so that a sintering and the formation of slag is avoided.

Abstract: A rotary dryer (1) for the drying of, for example, biological sludge, comprises a rotatable drum having rake elements (6) with openings for the passage of sludge disposed on the inner side of the drum casing.A drying plant with such a dryer further comprises a hot-gas plant (3) and one or more co-rotating drying zones (4,5).

Abstract: Continuous hydrolyzing of keratinaceous material is effected in an elongated hydrolyzing vessel (1) under suitable pressure and temperature which is established by direct steam injection through injection valves, whereby the product mass is heated, fluidized and agitated at one and the same time.An inlet chute (2), which is closed in a pressure-proof manner, leads the material in batches and at intervals into the vessel (1), and an outlet chute (3) at intervals leads the hydrolyzed material to an economizer (4) and further to a pressure-free removal vessel (10).The product mass in the hydrolyzing vessel (1) moves through the vessel as plunger flow established by the overpressure in the inlet chute (2).

Abstract: Continuous hydrolyzing of keratinaceous material is effected in an elongated hydrolyzing vessel (1) under suitable pressure and temperature which is established by direct steam injection through injection valves, whereby the product mass is heated, fluidized and agitated at one and the same time.An inlet chute (2), which is closed in a pressure-proof manner, leads the material in batches and at intervals into the vessel (1), and an outlet chute (3) at intervals leads the hydrolyzed material to an economizer (4) and further to a pressure-free removal vessel (10).The product mass in the hydrolyzing vessel (1) moves through the vessel as plunger flow established by the overpressure in the inlet chute (2).