METHOD OF CONTINUOUS DRYING OF LOOSE MATERIAL, AND NAMELY OF WOOD FIBRES AND/OR WOOD CHIPS Russian patent published in 2012 - IPC F26B11/02 F26B21/04 F26B23/02 

FIELD: heating.

SUBSTANCE: invention refers to the method of continuous drying of loose materials, and namely of wood fibres and wood chips, in drying plant (dryer); at that, vapours liberated during the drying process are removed to the drying circuit in which they are subject to indirect heating in heat exchanger with repeated transfer to the dryer. Continuous drying method of loose materials, and namely of wood fibres and/or wood chips, in dryer (1), especially in drum dryer, consists in the fact that loose materials are supplied to it and gas-vapour mixture is passed through it in drying circuit; at that, gas-vapour mixture is subject to indirect heating with exit gas of burner using at least one heat exchanger (4); drying vapours are supplied at least to one heat exchanger (4) and heated in it, and at least before, after or inside one heat exchanger (4) there removed is at least some amount of flow of drying vapours to supply to burner (5); at that, some amount of the flow, which is supplied to burner (5), is maintained at least by means of one fan (10) of some amount of vapour flow controlled as per the contamination level of exit gases of the burner, according to the oxygen content in exit gas of the burner and/or as per maximum content of neutral gas in the drying circuit. Manufacturing method of plates from wood-base materials consists in the fact that bark is removed from wooden logs; then, they are processed in crushing device till wood chips and/or wood fibres are obtained, which are dried in the drying plant, and dried wood chips and/or fibres are pressed in the form of plates in the pressing device, thus adding, if required, binding agents and/or other additives, and preferably cut to the size; at that, for drying of wood chips and/or fibres there used is the method according to any of items 1-12. The drying plant for loose materials, especially of wood fibres and/or wood chips, includes dryer (1), and namely drum dryer, at least one burner (5), at least one heat exchanger (4) that is intended for direct heating of gas-vapour mixture for drying of loose materials in dryer (1), at least one branch line at least before one heat exchanger (4), after it and/or inside it, which leads to burner (5) and intended for removal of some amount of flow of drying vapours, and at least one line for supply of the rest amount of drying vapours to dryer (1); at that, the branch line to burner (5) is equipped at least with one controlled fan (10) of some amount of vapour flow; at that, the above fan is controlled as per contamination level in exit gas of the burner, as per oxygen content in exit gas of the burner and/or as per maximum content of neutral gas in drying circuit. Plant for manufacturing plates from wood-base materials, at least with one crushing device, at least with one drying device and at least with one pressing device includes drying plant in the form of the plant made according to any of items 14-24.

EFFECT: system can respond ineffectively to the varying conditions, and namely to the change of moisture content, as well as to variations of grain size, changes of wood mixture and deviations of load.

25 cl, 3 dwg