Method of controlling the drying process in a drying section...

Details Method of controlling the drying process in a drying section... Method of controlling the drying process in a drying section...

D - Textiles, Paper

21

F

D21F 5/00 (2006.01) D21F 5/04 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2353396

A method for controlling the drying process taking place in the dryer section of a paper machine or the like. The dryer section comprises at least one drying cylinder unit (26, 28, 30, 32, 34) and at least one air impingement unit (20, 21, 22). Optimal evaporation is first compiled in a manner known as such, for example, on the basis of a recipe or by utilising a machine- direction quality model or quality profile, when the geometry of the dryer section, the process parameters required, such as machine speed, paper grade and total evaporation required are known. According to the invention, limit values are calculated for at least two controlled variables of the dryer section, such as the steam pressure p and the temperature T of blowing air, making use of drying quality models known as such, such as models representing the adhesion and brightness of paper. After this the dryer section is divided on the basis of the distribution formed by the limit values of the controlled variables into drying segments (10, 12, 14, 16), so that in two adjacent segments, the limit value of at least one controlled variable is different. The drying process is controlled by adjusting the controlled variables in each drying segment, within the limit values of the controlled variables.

L'invention porte sur un procédé de commande du processus de séchage s'effectuant dans la section de séchage d'une machine à papier ou autre. La section de séchage comprend au moins une unité (26, 28, 30, 32, 34) de cylindres de séchage et au moins une unité (20, 21, 22) pneumatique. L'évaporation optimale est d'abord établie de manière connue, par exemple, à partir d'une formulation ou à l'aide d'un modèle ou d'un profil de qualité dans le sens machine lorsque la géométrie de la section de séchage, les paramètres de traitement requis tels que la vitesse de la machine, la qualité du papier et l'évaporation totale, sont connus. Selon cette invention, des valeurs limites sont calculées pour au moins deux variables contrôlées de la section de séchage telles que la pression p de la vapeur et la température T de l'air de soufflage, à l'aide des modèles de qualité de séchage connus tels que des modèles représentant l'adhésion et la brillance du papier. Puis, la section de séchage est divisée selon la répartition obtenue par les valeurs limites des variables contrôlées dans les segments (10, 12, 14, 16) de séchage de sorte que, dans deux segments adjacents, la valeur limite d'au moins une variable contrôlée soit différente.

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