Steam Theory for Tissue Machines
Steam is commonly used in industrial environments for power generation and in heating and drying applications. On a tissue machine, steam is used to dry the sheet of paper to a target moisture content before it is wound up on large rolls that can be transported, stored and shipped. Before one can understand how steam is used in heating and drying applications, like tissue machine drying systems, it is important to understand how steam is created, how heat energy is transferred from the steam to the sheet of tissue, and the relationship between steam pressure and steam temperature.
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Learning Objectives
• The three phases of water – solid, liquid, and gas
• Boiling point
• Latent heat
• Condensation
• Superheated steam
• The relationship between steam pressure, steam temperature, and latent heat
• How steam is used in a tissue machine drying system
Specs
| Course Level | Intermediate |
| Languages | English |
| Compatibility | Audio, Video |
| Based on: | Industry Standards and Best Practices |
Key Questions
What is saturated steam?
Saturated steam is pure steam that
What is superheated steam?
Steam that is at a temperature above its boiling point.
What is latent heat?
Latent heat is the amount of energy absorbed or released when a substance changes state. With water, the latent heat of vaporization is the amount of energy required to change the water from a liquid to a gas, or steam, at its boiling point.
How is steam used to dry tissue?
Steam is piped to the inside of a metal dryer, usually a Yankee dryer for tissue. The steam transfers heat to the dryer as it condenses into water.
What is a desuperheater?
A desuperheater injects hot water, or condensate, into superheated steam to lower its tempurature to saturation temperature.
Sample Video Transcript
Steam is used in many different places and in many different ways. In industrial environments, it is commonly used for power generation, and in heating and drying applications. This module will focus on steam theory as it relates to heating and drying. Though this information is also relevant to the generation of power. We will use a tissue machine drying system as an example. Steam is used on a tissue machine to dry the sheet of tissue to a target moisture content. Before one can understand how steam is used in this type of process, it is important to first understand how steam is created, how heat energy is transferred from the steam to the sheet of tissue, and the relationship between steam pressure and steam temperature.
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