Abb Flakt Ab

Valmet Fibertech Ab

Andritz Technology and Asset Management Gmbh

Ulf Persson

Stefan Backa

Thomas Liljenberg

Lars Peter Nilsson

Johan Ekh

Anders Andr&eacute;n

Xiaolong Feng

Xiaojing Zhang

A method in consolidation and drying of paper. A wet web is contacted with superheated steam, whose temperature is 200-600&deg; C. for the purpose of reducing, by heat transfer from the superheated stream, the water content of the web by evaporation of a substantial part of the water in the same. The wet web is supported and transported by means of a heat-conductive, gas-impermeable belt whose width is equal to or exceeds the width of the web, and jets of the superheated steam are directed towards the side of the web facing away from the belt.

Method in drying of paper

Method for drying wood raw material ( ) by means of hot gases ( ) supplied to the drying process, in which VOC, apart from water, evaporate from the wood raw material into the gases. The drying process is divided and carried out in at least two sub-steps (I, II), from which process gas ( ) is removed separately, and the drying process is thus controlled that VOC evaporate during one of the sub-steps, and the VOC are concentrated to this sub-step. The temperature of the gas containing VOC is increased to a temperature exceeding 180&deg; C. before VOC are oxidized catalytically at said elevated temperature, in order to reduce the discharge of VOC from the drying process.

Two stage process for drying of raw wood material

The device relates to a wood drying plant comprising a wood drying device and a purifying device which is arranged to receive a drying gas from the wood drying device, the drying gas comprising water steam and volatilized organic components such as terpenes, and to purify the drying gas from organic components and to recover the latter. The purifying device comprises at least one condenser which is arranged to separate relatively difficultly volatilized components containing organic components and relatively easily volatilized components. The purifying device also comprises a separating device which is arranged to separate said organic components and a rest material from the relatively difficultly volatilized components. The purifying device also comprises a transferring device which is arranged to transfer organic components present in the rest material to the drying gas introduced in the purifying device.

Wood drying plant and a method of purifying a drying gas from a wood

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Örsundsbro, Sweden

Ulf Persson