Drying cylinder is made of cast iron with a cover on both ends of the hollow cylinder, composed, at the ends of the cylinder block and cylinder head diameter is 1000 ~ 3000 mm, more in the process of operation, the steam will transfer paper baking hot light. Paper machine dryer with cast iron is used as the key components of the paper drying - Ⅰ class pressure vessel. Cast iron drying cylinder accounts for about 2/3 of the pressure vessels in the paper industry. The material that makes the oven is usually HT200, HT250. On the manufacturing quality requirements are not allowed to penetrate and excessive sand holes, in order to increase the paper smoothness, requested the dryer surface polishing and the inner surface rotation, to keep the whole cylinder wall thickness is consistent, to ensure the safety of dryer, balance and heat evenly throughout. The effect of the dryer is to dry the water in the paper pages.
Part of the
Drying cylinder main parts include: heat pump, the steam supply system, the condensed water recycling system, flash tank, differential pressure control system, pressure control system, flash tank, noncondensable exclude system, hot water pump, manual control program, the warm-up - paper - boot program system.
Drying principle of dryer
The saturated steam from the steam joint is condensed in the oven, and the heat released by the steam causes the temperature of the dryer to rise, which will heat the paper over the surface of the roller shell. Heat is transferred to the paper in contact with the surface of the paper and the dryer.
After releasing heat steam condensate produced a large number of condensed water, the condensed water because the rotation of the cylinder dryer attached by centrifugal force in the inner surface, form water ring under the condition of the angular velocity is higher, hindered the dryer to the surface of the heat transfer, so you need to siphon to condensed water discharge in a timely manner. When the speed is low, the water ring will not form, but there will also be the condensation of water in the dryer.
