The Yankee dryer is a large, steam-heated, pressure vessel that is used in the production of tissue grades. During production, high pressure steam is supplied to the inside of the dryer to heat the shell and dry the sheet, and the condensate that forms must then be removed. This course describes the steam distribution and condensate removal equipment found in a Yankee dryer. It then discusses how the steam pressure inside the dryer is controlled, how thermocompressors operate, and two common methods used to control the flows of steam and condensate through a Yankee dryer.
Learning Objectives
- Describe Yankee dryer shell design
- Describe steam distribution and flows into the dryer
- Describe condensate removal and flows out of the dryer
- Describe thermocompressor design and operation
- Describe pressure control
- Describe differential pressure control
- Identify condensate system issues
- Define Maximum Allowable Working Pressure (MAWP)