Steam Theory for Paper Machines
How steam is created, how heat energy is transferred from the steam to the sheet on a paper machine, and the relationship between steam pressure and steam temperature. Discusses latent heat, condensate, and superheat.





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Course Details
Learning Objectives
• Describe the three phases of water • Define the boiling point of water • Define “latent heat” • Define “condensation” • Define “superheated steam” • Describe problems with using superheated steam on a paper machine • Describe the relationship between steam pressure, temperature, and latent heat • Describe how steam is used in a paper machine drying system • Identify the flow of steam and condensate through the paper machine
Specs
Frequently Asked Questions
Why does water boil at lower temperatures at higher elevations?
What is condensate?
What is superheated steam?
How can superheated steam cause problems with the rotary joints on dryer cans?
Why is it important to collect and reuse the condensate from a paper or board machine?
Sample Video Transcript
Water or H2O, exists in three phases: solid, liquid, or gas. The phase that water takes is determined by its temperature and pressure. There are some significant changes that occur as water goes from the liquid to gaseous phase. This transition is referred to as boiling, and it occurs at 212 degrees Fahrenheit at normal atmospheric pressure, zero PSI gauge pressure. As heat is added to liquid water, it increases in temperature. Each BTU, a unit of energy that is added, increases the temperature of one pound of liquid water by one degree Fahrenheit. Once the water reaches the boiling point, the temperature stops increasing. As even more heat is added, this energy goes toward creating vapor rather than increasing temperature. Once all of the liquid water in a system has turned to vapor or evaporated, the temperature will resume its increase as more heat is added. Steam at a temperature above its boiling point is called super-heated steam.