Method and system in a paper machine and software product

Details Method and system in a paper machine and software product Method and system in a paper machine and software product

D - Textiles, Paper

21

F

D21F 7/00 (2006.01) D21F 5/20 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2587614

The invention comprises a method and a system in a paper machine, and also a software product, allowing one or more tools to be generated for indicating the state of the paper production process in terms of energy consumption to the operating staff of the paper machine. This allows continual monitoring of the state of the paper production process and/or its energy efficiency combined with efforts to develop the manners of running the paper machine and its dryer section in a more favourable direction. In one embodiment of the invention, the dry solids content DSC of the press section can be calculated by means of the evaporation amount of the dryer section, the production of finished paper and the final paper moisture as follows: DSC = m pap,d/( m pap,d + m H2O), in which m pap,d is the dry mass flow of the paper web to the dryer section and m H2O is the water mass flow to the dryer section. m H2O is obtained by summing up the mass flow of the water discharged from the dryer section and the evaporated water mass flow.

L'invention concerne un procédé et un système destinés à une machine à papier, ainsi qu'un logiciel générant un ou plusieurs outils permettant d'indiquer à l'équipe d'opérateurs de la machine à quel stade se situe le processus de production de papier en termes de consommation d'énergie, permettant ainsi de contrôler en continu le stade du processus de production de papier et/ou de son rendement énergétique, et de fournir simultanément des efforts pour mettre au point des modes d'exploitation plus favorables de la machine à papier et de sa sécherie. Dans un mode de réalisation, la teneur en matière sèche (TMS) de la section presse peut être calculée à partir des quantités d'eau évaporées dans la sécherie, la production du papier fini, et de la teneur en eau finale du papier, selon la formule suivante: TMS = mpap,d/(mpap,d)+mH2O, dans laquelle mpap,d représente le débit massique de la matière sèche de la bande de papier entrant dans la sécherie et mH2O représente le débit massique de l'eau entrant dans la sécherie. On obtient la valeur de mH2O en additionnant le débit massique de l'eau évacuée par de la sécherie et le débit massique de l'eau évaporée.

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