1. introduction to course12 session 1

8/13/2019 1. Introduction to Course12 Session 1

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School of EngineeringDepartment of Forest Products Technology

University of the Republic

School of Engineering

Pulp Mill Fiber Line Processes

Olavi Pikka, LicTech

1st - 12th October, 2012

Department of Forest Products Technology


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Pulp Mill Fiber Line ProcessesOlavi Pikka

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Pulp Mill Fiber Line Processes

Lecture 1: Introduction to the

course


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Lecturers Personal Data

Olavi Pikka, born 1950

Studies at Helsinki University of Technology (Pulp & PaperTechnology), MSc 1974, LicTech 1979.

Working career: HUT 1975 - 1979

Rauma-Repola Pori Works 1980 - 1986

Ahlstrm Machinery 1986 - 2000

Andritz-Ahlstrm 2000 2002 Andritz Oy 2002

Since August 2010 in Brazil Curitiba

Technology Director Fiber Line

E-mail: [email protected]


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Course Structure and Schedule

Main schedule and time table

Topics of the course


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Main schedule

Topic Hours Date

1. Introduction to kraft pulping and pulp mill fiberline 3 h 1.10

2. Fiberline unit processes

2.1 Woodyard/chip preparation 3 h 2.10

2.2 Cooking processes 6 h 3-4.10

2.3 Pulp Washing and screening 6 h 5-8.10

2.4 Oxygen delignification 3 h 9.10

2.5 Pulp bleaching 6 h 10-11.10

2.6 Post-screening, drying and baling 1 h 12.10.

3. Course wrap up 2 h 12.10.

30 h


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Lecture hours

Monday to Friday

18:30 21:30


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1. Introduction to kraft pulping and the pulp mill

fiberline

1. Purpose and targets of pulping processes

From wood to bleached pulp fibers to be used for

various end products

Emphasis on kraft pulping; also other pulping

processes mentioned (chemical and mechanical)

2. Kraft pulp mill Overview: fiberline and recovery

Main unit processes of fiberline

Main unit processes of recovery (briefly)


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Pulp Mill


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2.1 Woodyard/Chip preparation

1. Purpose and targets of chip preparation

Required chip characteristics

2. Woodyard operations

Overview

Unit operations

Debarking

Chipping

Chip screening

Storage and transportation

Bark handling

3. Specific features of plantation eucalyptusfrom the woodyard point of view (Fray

Bentos woodyard as an example)


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2.2 Cooking process

1. Purpose and targets of cooking

2. Main terminology

3. Sulfate/kraft cooking chemistry

Main reactions for bleachable sulfate pulp

Reaction/process conditions

Reaction pseudo-kinetics/H-factor

Target level of delignification/yield

4. Strength delivery; fiber effects


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2.2 Cooking process (continued)

Unit operations of cooking

1. Steaming of chips and air removal

2. Cooking liquor impregnation of chips (penetrationand diffusion)

3. Chip bed operations

Fluid dynamics/chip bed packing

Displacement in the chip bed

Heat transfer operations

Mass transfer operations/digester washing


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2.2 Cooking process (cont.)

1. Industrial cooking processes

Continuous cooking

Batch cooking Modified cooking processes

Cooking additives (PS, AQ)

2. Specific features of eucalyptus cooking

3. Fray Bentos cooking process as an

example of modern industrial cooking


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2.3 Pulp washing and screening

1. Purpose of pulp washing

2. Terminology of pulp washing

3. Washing calculations Mass balances and washing efficiency calculations

4. Industrial pulp washing practices

Washing equipment

Washing systems/Fray Bentos as an example

5. Purpose of pulp screening

6. Theoretical aspects and terminology of screening

7. Screening equipment and screening systems;location in the process


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2.4 Oxygen delignification

1. Purpose of oxygen delignification

2. Oxygen delignification reactions

3. Oxygen deliginfication parameters

4. The performance of oxygen delignification

Delignification

Pulp yield and strength

5. Industrial oxygen delignification practices

One and two-stage systems

Fray Bentos as an example


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2.5 Pulp bleaching

1. Introduction to bleaching:

Targets of bleaching

Principle of multistage bleaching/bleaching sequence

Roles of different bleaching chemicals and stages

2. Delignifying in bleaching:

Targets and purposes

Chlorine dioxide (reactions, process parameters,

performance)

Ozone and peroxide (reactions, process parameters,

performance)

Alkaline extraction (EO, EOP) (reactions, processparameters, performance)

Hexenuronic acid removal (main aspects especially

from euca point of view, A-stage process)


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2.5 Pulp bleaching (cont.)

1. Brightening in bleaching:

Targets

Chlorine dioxide brightnening (reactions, process

parameters, performance)

Peroxide bleaching (reactions, process parameters,

performance)

2. Other bleaching chemicals (briefly)

3. Industrial bleaching

Typical bleaching sequences (euca in particular)

Bleach plant connections (washing, water

circulations) Bleaching effluents


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2.6 Pulp drying and baling

1. Pulp drying and finishing department

Purposes and main unit processes and operations

2. Post-screening Why, what to remove?

Centricleaning, reverse centricleaning

3. Pulp drying machine

Principles

White water system

Machinery

4. Baling


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3. Wrap up

Summary of the course

Highlighting the most essential aspects Questions from you?

1. introduction to course12 session 1

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