anleggning for drying of animal or vegetable material

摘要

PCT No. PCT/NO84/00018 Sec. 371 Date Nov. 7, 1984 Sec. 102(e) Date Nov. 7, 1984 PCT Filed Apr. 5, 1984 PCT Pub. No. WO84/03935 PCT Pub. Date Oct. 11, 1984.A plant for heat treating animal or vegetable material comprises apparatuses for two-stage or multi-stage heat treatment. A heat medium which is used in a second heat treatment apparatus (2), which follows a first heat treatment apparatus (1), consists of uncontaminated water/steam which is circulated in a closed circuit, that is to say separated from the heat medium of the first apparatus and from the treatment material of the second apparatus. The closed circuit extends from heat exchanger surfaces, which are supplied with heat energy from exhaust gas/exhaust steam from the first apparatus (1), via heat surfaces of the second apparatus (2) back to said heat exchanger surfaces. The closed circuit includes one or more steam compressor(s) (17) in order to bring in a manner known per se the heat medium of the circuit up to the process steam pressure before it is supplied to the heat surfaces of the second apparatus (2).