Patent ID: 6547930
Filing Date: 2003-04-15
Classification: D21F,D21G,Y10S

Abstract:
A method for estimating a dryer steam pressure in a paper making machine comprising the steps of:setting as operating conditions paper making speed, weight setting value and moisture percentage value; initially setting dry bulb temperature and measuring an in-hood air dry bulb temperature to set a corresponding value for each divided mesh on basis of said measured value of in-hood air dry bulb temperature; initially setting a steam temperature corresponding to each divided mesh of an in-drum steam temperature determined on basis of saturated steam pressure curve from a dryer steam pressure setting; calculating dry speed coefficient according to a simulation; and providing estimated dryer steam pressure from the above obtained operating conditions, dry bulb temperature, initial steam temperature dry speed coefficient, and steam temperature which is calculated on basis of difference between a calculated in-drum steam temperature and an initial drum steam temperature.