Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Modeling Project - Pulping and Bleaching - Fall 2007 | PSE 476, Study Guides, Projects, Research of Materials science

University of Washington (UW) - SeattleMaterials science

Material Type: Project; Class: PULPING/BLEACHING; Subject: Paper Science and Engineering; University: University of Washington - Seattle; Term: Spring 2007;

Typology: Study Guides, Projects, Research

Pre 2010

Uploaded on 03/10/2009

koofers-user-8iy
koofers-user-8iy 🇺🇸

10 documents

1 / 4

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
PSE 476
Modeling project
Rough Draft Due: 2 March 2007
Final Report Due: 9 March 2007
For this project you will work in teams of three or four. Each of you will use the model
to carry out one of the studies listed below then pull your results together for the final
report. I am looking for a thorough analysis of each of the problems given below. These
are open-ended problems that have more than one correct answer. Your grade will
depend on how thorough you analyzed a situation, the quality of your conclusions, and
the professionalism of your final reports. The reports should be similar to that you would
write if working in a mill. You should include the following in the report; state the
objective of the project – a condensed reiteration of the problem statement, how you went
about the analysis, a presentation and discussion of the results, final conclusions and
recommendations. The reports need to be neat and well written. (I have become
convinced that style is at least as important as content in the business world). I won’t put
a page target for the report but I generally like things short. It is important that you
Groups:
1. Aldrich, Cooper, Greenwood, Hargrove.
2. Hua, Kim, Lin, McMahon
3. Noste, Ross, Salvatier
4. Schairbaum, Thein-Chen, Zuk
pf3
pf4

Partial preview of the text

Download Modeling Project - Pulping and Bleaching - Fall 2007 | PSE 476 and more Study Guides, Projects, Research Materials science in PDF only on Docsity!

PSE 476

Modeling project Rough Draft Due: 2 March 2007 Final Report Due: 9 March 2007 For this project you will work in teams of three or four. Each of you will use the model to carry out one of the studies listed below then pull your results together for the final report. I am looking for a thorough analysis of each of the problems given below. These are open-ended problems that have more than one correct answer. Your grade will depend on how thorough you analyzed a situation, the quality of your conclusions, and the professionalism of your final reports. The reports should be similar to that you would write if working in a mill. You should include the following in the report; state the objective of the project – a condensed reiteration of the problem statement, how you went about the analysis, a presentation and discussion of the results, final conclusions and recommendations. The reports need to be neat and well written. (I have become convinced that style is at least as important as content in the business world). I won’t put a page target for the report but I generally like things short. It is important that you Groups:

  1. Aldrich, Cooper, Greenwood, Hargrove.
  2. Hua, Kim, Lin, McMahon
  3. Noste, Ross, Salvatier
  4. Schairbaum, Thein-Chen, Zuk

Digester control problem

Kappa number from a batch digester is controlled mainly by setting H-factor, EA charge and Sulfidity. It is important to understand how fluctuations in each can effect the final kappa number. We will use the WinGEMS model to better understand the control requirements of a digester.

  1. H-Factor control. You can use the pulping model to generate a set of data for H-factor and kappa. Plot H-factor vs. kappa. Obtain different values of the H-factor by varying the input pulping time and pulping temperature. Vary both to see if they give the same H-factor vs. Kappa curve. Use the default pulping conditions as a basis. Establishing some heuristics, rules of thumb, is good idea for any engineer in charge of a process. In this case we want to know the influence coefficient of the H-factor on the kappa. That is kappa/H-factor. This parameter will depend on the target kappa and may depend on the other pulping conditions (EA, Sulfidity) as well. Give the influence coefficient of H-factor on kappa and state any caveats associated with this parameter. If the control limit on kappa is  2, what should the control on the H-factor be?
  2. Alkali and Sulfidity control. We want to know the response of kappa to the EA charge and the sulfidty. Run a series of simulations to generate the response in kappa to changes in EA and Sulfidity. The results should be in a plot of EA (or Sulfidity) vs. Kappa. Use the default pulping conditions (18% EA, 25% sulf., 5 L/W, 60min heat- up, 133min. total time, 170oC pulping temp) as your basis. Establish the influence coefficients for EA and Sulfidity on the kappa (i.e. kappa/EA and kappa/ Sulfidity). What are the limits on EA and Sulfidity to keep the kappa range within 
    A mill may want to change its sulfidity for various reasons. For example there is considerable evidence that if you raise sulfidity substantially the pulp quality will improve. Of course, this will make the mill smell worse and could create a TRS (total reduced sulfur) problem. You need to establish with the pulping model whether the influence coefficient of the EA on the kappa is a function of sulfidity and if it is, at what sulfidities, both higher and lower, do you need to determine a new one to operate the digester.

Digester Comparison

Use the pulping simulator to compare the performance of three commercial digesters. In this problem compare the pulp quality, as measured by pulp viscosity, and the pulp uniformity of a Kamyr, Batch, and M&D digester. In addition, determine which digester would have the greatest throughput (shortest pulping time). Is there are general correlation between production rate and pulp quality? The following table gives the general operating differences of these digesters: Property Batch Kamyr M&D Pulping time, min 145 Adjust to kappa Adjust to kappa Heat-up time, min 50 10 10 Max Temp 170 162 180 Liq/wood 4.5 3.1 3. Assume the chip size distribution of problem 2 (original), the EA charge and sulfidity can be assumed to be 18% and 25% respectively.