Analysis of performance of a multicylinder dryer, using computer simulation model and experimental data

A mathematical model is presented that describes the operation of a high speed multicylinder paper machine dryer with a single tier configuration. The model uses input parameters such as cylinder diameters, dryer geometry, steam temperature, air humidity, and temperature, etc, to calculate the number of cylinders required, felt temperatures, paper web temperatures, moisture content and drying rate along the length of the dryer section. The program has been verified by comparing its output with data from production paper machines. The model can be used to predict the effect of various design parameters on the dryer performance, such as dryer cylinder and vacuum roll diameters, and roll spacing. It can be used to predict the conditions required for uniform drying of the paper web, taking into account the differences in heat and mass transfers occurring at the opposite sides of the paper dried on a single tier dryer. To increase the dryer performance, use of air impingement systems is suggested