Paper Machine Dryer Hood Air Systems

SKU: C-747Duration: 34 Minutes Certificate Included

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.

Language:  

Great for in-person classroom training or as an alternative to DVD.

Includes printable documents and Convergence Video Player for Windows systems. Content expires after 1 year.

Language:  

Ideal for corporate licensing and volume users who also need administrative tracking and reporting on training.

Get this interactive eLearning course into your LMS or learn how you can leverage our LMS to deliver training to your workforce.

Need multiple courses or have lots of users? Just let us know a little more about what you need and we’ll get you some great volume pricing.

 Need help deciding? Compare delivery formats.

Course Details

Specs

Training Time: 34 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, Portuguese, Spanish
 Multiple languages available for USB and Enterprise (SCORM/AICC) formats. Contact us for more info.

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.

Learning Objectives

At the end of this module, you will be able to:

  • 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

Key Questions

The following key questions are answered in this module:

What is the difference between "open" hoods and "closed" hoods?
Open hoods have walls and a roof, but are open at the operating level. Closed hoods have movable walls at the operating level to fully enclosed the dryers, and totally closed hoods are also enclosed at the basement level.

What are the advantages of closed hoods?
Lower exhaust air flows so exhaust fan requirements are lower and heat recovery is possible. Also reduced building heating load because they have dedicated supply air systems.

For a machine with closed hoods, should the supply air flow be equal to the exhaust air flow?
Modern hoods should have 65% to 75% of the exhaust air flow supplied as dry heated air. The remainder is supplied by infiltration around the hood seals and doors to prevent hot humid air from escaping into the machine room.

How can the heat that is recovered from hood exhaust air be used?
It can be used to preheat the hood supply air, heat process water, or heat ventilation air to the building

Can hood performance be evaluated somewhat easily?
Yes. Hood performance indicators include the hood supply air flow, hood supply air temperature, and hood exhaust air humidity, which are all measurable.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

The two main goals of a paper machine dryer hood air system are to remove the water vapor that is evaporated from the sheet in the dryer section and to control the temperatures, humidities, and air flows around the sheet in the pockets across the full machine width. By satisfying these two goals, the hood air system increases the drying capacity of the machine, improves sheet moisture profiles, reduces stain requirements, and improves the runnability of the dryer section. The benefits of a properly designed and operated hood air system are improved sheet quality, increased production, and improved energy efficiency.

Customer Q&A

Ask a Question

Sorry, we're missing some information

I would like to have several employees take multiple courses. How can I set that up?

We're in the process of making bulk course and multiple user purchases easier. But for now, you can order multiple courses and contact us with details on who you'd like to assign courses to. We can set up each user's training plan and make sure everyone gets the eLearning assignments they need.

Can I get a free full-length preview of a course to see what this course covers?

While we do our best to offer details on course contents, we don't normally offer full-length previews. But please contact us with more details for a better understanding of what your organizaton needs and how we can help.

Do I get a certificate when I complete a course?

Yes. All of our courses allow you to print a completion certficate upon successfully passing the integrated test at the end of each eLearning course.

How do I log in to take a course that I have already paid for?

You'll receive an email with login details moments after you purchase your pay-per-view (PPV) course. Just click the login link and enter the user name and password provided.

Do you have courses in different languages?

Yes. While all of our courses are originally produced in English, we develop many courses in a growing number of languages, including Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Spanish, Tamil, and Thai. Available languages are normally displayed in the Course Details section on each course page.
Added to Cart! Click here to view your cart.