Method and apparatus for controlling the drying process in a...

D - Textiles – Paper – 21 – F

Patent

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D21F 5/00 (2006.01)

Patent

CA 2353564

A method and apparatus for controlling the drying process taking place in the dryer section of a paper machine or the like. The total drying efficiency required in the dryer section is first calculated by means of a method known as such, and an optimal drying efficiency distribution is compiled. Using the optimal drying efficiency distribution, the dryer section is divided into two or more imaginary drying segments which differ in their drying action, in at least one of which segments there are at least two dryer units using different forms of energy and/or at least two separately adjustable dryer units using the same form of energy. The total drying efficiency obtained is divided, by means of an optimisation method known as such, between the said different drying segments in such a way that a good drying efficiency distribution is achieved in terms of the quality of the web being dried.

La présente invention concerne un procédé et un appareil permettant de commander le processus de séchage de la section de séchage d'une machine à papier ou analogue. L'efficacité de séchage totale nécessaire dans la section de séchage est d'abord calculée avec une méthode correspondante, à la suite de quoi est établie la répartition de l'efficacité de séchage optimale. Le dispositif de séchage est ensuite divisé, à l'aide de la répartition de l'efficacité de séchage optimale, en deux ou davantage de segments de séchage imaginaires caractérisés par une action de séchage différente. Au moins un de ces segments comporte au moins deux unités de séchage utilisant différentes formes d'énergie, et/ou au moins deux unités de séchage réglables séparément utilisant le même type d'énergie. En outre, une méthode d'optimisation permet de diviser l'efficacité de séchage totale résultante entre les différents segments de séchage précités, de manière à obtenir une bonne répartition de l'efficacité de séchage en fonction de la qualité de bande de papier séchée.

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