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公开(公告)号：EP0712481B1
公开(公告)日：1997-10-29
申请号：EP94926123.4
申请日：1994-07-27
发明人： BAHNER, Friedrich , BRAUN, Manfred , LANG, Karl-Friedrich , LEHN, Gerhard , MAURER, Karl , SCHMIDT, Manfred , STEINKUHL, Josef
CPC分类号： F26B3/283 , F26B15/12 , F26B21/06 , F26B23/002 , F26B23/02 , F26B23/10 , Y02P70/405
摘要： In order to dry boards, the boards are guided on racks through a drier and brought into contact with drying air in two stages. In a stage A with a higher drying power, the drying air is supplied at a higher temperature and with an at least average humidity, and in the other stage B, it is supplied at an average temperature and with a low humidity. The waste heat of the outgoing air from stage A is used for preheating the drying air. This process should reduce the consumption of primary energy. For that purpose, a process is known that consists in also using the outgoing air condensation heat. This has the inconvenient, however, of requiring substantially more secondary energy, as important air mass flows are required to transfer heat because of the low condensation temperature. Primary energy should be reduced by using condensation heat without substantially increasing secondary energy requirements. According to the invention, the outgoing air from stage A is supplied to stage B through a heat exchanger arranged in the rack of the drier. The drying air of stage B is supplied in counter-current through the drier with a low humidity and temperature, so that the boards are dried in stage B both by condensation heat and by radiant heat. Thus only a reduced mass flow of drying air is required to transfer the condensation heat. The consumption of primary and secondary energy is low. This invention is suitable for drying boards, in particular boards for buildings, such as gypsum plaster boards and fibre boards.
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公开(公告)号：EP0712481A1
公开(公告)日：1996-05-22
申请号：EP94926123.0
申请日：1994-07-27
发明人： BAHNER, Friedrich , BRAUN, Manfred , LANG, Karl-Friedrich , LEHN, Gerhard , MAURER, Karl , SCHMIDT, Manfred , STEINKUHL, Josef
CPC分类号： F26B3/283 , F26B15/12 , F26B21/06 , F26B23/002 , F26B23/02 , F26B23/10 , Y02P70/405
摘要： In order to dry boards, the boards are guided on racks through a drier and brought into contact with drying air in two stages. In a stage A with a higher drying power, the drying air is supplied at a higher temperature and with an at least average humidity, and in the other stage B, it is supplied at an average temperature and with a low humidity. The waste heat of the outgoing air from stage A is used for preheating the drying air. This process should reduce the consumption of primary energy. For that purpose, a process is known that consists in also using the outgoing air condensation heat. This has the inconvenient, however, of requiring substantially more secondary energy, as important air mass flows are required to transfer heat because of the low condensation temperature. Primary energy should be reduced by using condensation heat without substantially increasing secondary energy requirements. According to the invention, the outgoing air from stage A is supplied to stage B through a heat exchanger arranged in the rack of the drier. The drying air of stage B is supplied in counter-current through the drier with a low humidity and temperature, so that the boards are dried in stage B both by condensation heat and by radiant heat. Thus only a reduced mass flow of drying air is required to transfer the condensation heat. The consumption of primary and secondary energy is low. This invention is suitable for drying boards, in particular boards for buildings, such as gypsum plaster boards and fibre boards.
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