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Language: English Portuguese
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Training Time: 34 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese
Paper and board machines use steam-heated dryer cylinders and multiple steam groups to dry the sheet to its final moisture target. In a thermocompressor steam system, each steam group has a thermocompressor that uses high pressure motive steam to pull flash and blow-through steam from the section condensate tank and boost it to a more useful pressure. This steam is supplied to the section steam header where makeup steam is added to control the steam pressure going to the cans. This module will cover the components and operation of a thermocompressor steam system.
At the end of this module, you will be able to:
The following key questions are answered in this module:
What is a steam group on a paper or board machine?A steam group is a set of dryer cans that are supplied steam at a controlled pressure from a single steam header, and typically discharge all of their condensate to a single common condensate header.
What is a thermocompressor?A thermocompressor is a device that uses high pressure "motive" steam to pull in lower pressure steam in order to boost it to a more useful steam pressure so it can be re-used.
How does a thermocompressor like a valve?Because the size of the nozzle opening can be changed by an actuator, which changes the flow of motive steam and therefore the amount of lower pressure steam that is pulled in, a thermocompressor basically acts like a valve.
Why is that thermocompressor steam systems can respond more quickly to production rate changes than cascade steam systems?Thermocompressor systems allow for independent control of the steam pressures in the groups so the system response is faster.
How do thermocompressor steam systems account for the decrease in drying rate that occurs as the sheet dries on a paper or board machine?Steam header pressures (and therefore temperatures) are often lower toward the wet end and higher toward the dry end to compensate for the decrease in drying rate.
Below is a transcript of the video sample provided for this module:
Dryer Felt Design
View Course
Dryer Felt System Operations
Paper Machine Alternative Drying Systems
Paper Machine Cascade Steam Systems
Heat Exchanger Basics
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