Paper Machine Dryer Hood Air Systems
Paper and board machine dryer hood air systems have two main goals: remove the water vapor evaporated from the sheet in the dryer section and control the temperatures, humidities, and air flows in the dryer pockets across the full machine width. A properly designed and operated hood air system will increase the drying capacity of the machine, improve the reel moisture profile, reduce steam requirements, and improve the runnability of the dryer section. This module will cover the components and operation of paper machine dryer hood air systems.
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Learning Objectives
• List the objectives of a dryer hood air system • Describe heat transfer and mass transfer during the sheet drying process • Identify and describe open and closed hoods • Identify and describe the components of a typical modern hood air system • List the goals and benefits of a hood air system • Explain how hood supply and exhaust air flows are typically regulated • Describe the functions of pocket ventilators, anti-blow boxes, and vacuum rolls in dryer sections • List common uses for the heat recovered from hood exhaust air • Explain how humidity is measured • List and describe the indicators that can be used to evaluate hood air system performance • Identify and describe safety hazards and guidelines for paper machine dryer sections
Specs
| Course Level | Intermediate |
| Languages | English |
| Compatibility | Audio, Video |
Course Applies To
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