CASE STUDY OF COST SAVINGS WITH A NEW CHEMICAL MIXING SYSTEM AT MITSUBISHI PAPER HACHINOHE MILL PM7 potx

MITSUBISHI PAPER MILLS LIMITED Technologies Case Study of Cost Savings with a New Chemical Mixing System at Mitsubishi Paper Hachinohe Mill PM7... Necessity ofnew chemical mixing system

J.Matula Wetend Technologies Ltd.

K.Sato Mitsubishi Paper Mills Ltd.

R.Watanabe Mitsubishi Paper Mills Ltd

MITSUBISHI PAPER MILLS LIMITED

Technologies

Case Study of Cost Savings

with a New Chemical Mixing System

at Mitsubishi Paper Hachinohe Mill PM7

Outline of Mitsubishi Paper Group

Ü Mitsubishi Paper Mills Limited (MPM)

Mills : 5 mills in Japan

Product : Printing paper, Office use paper,

Business communication paper,

White lined board, Photographic paper

Ü Mitsubishi HiTec Paper GmbH

Mills : 2 mills in Germany

(Bielefeld and Flensburg)

Outline of Hachinohe Mill

Ü Hachinohe Mill

Production : 0.9 million t/year

Machines : 7 paper machines and 3 off-coaters

Outline of PM7 in Hachinohe mill

Decrease in FPR

(*) LBKP = Laubholz Bleached Kraft Pulp

Change in dosing rate

of retention aids

100

110

60 80 100 120

Before ECF

After ECF

Necessity of

new chemical mixing system

Ü Request to new chemical mixing system

Reduction in retention aids Improvement of FPR

No scale and dirt

No sheet formation problem

Ü Examination of installation “Jet Injection” mixing technology

Previous machine flow

P

C-PAM

With New Jet Injection Mixing, machine flow

P

C-PAM

Concept of laboratory test

Simulation of

conventional mixing points

(*) Tested at Mütec DFS retention analyzer

C-PAM before machine screen

A-PAM after machine screen

Simulation of new chemical mixing points

Result of laboratory test

10 15 20 25 30 35 40 45

TrumpJet ® Flash Mixing = Jet Injection Mixing for papermaking additives

Wetend Technologies Ltd is a Finland based corporation.

City of Savonlinna

FiberLaboratory

Injection stock

Chemical Mixing stock

additives

-Transverse injection exploits

circulated headbox feed stock.

-Use of fresh water or filtrate is

completetly eliminated

-Flash mixing takes place in

time of two seconds

PATENTED Flash-Injection mixing technology

Jet Injection Mixing for papermaking additives

-Two or more additives can be

mixed simultaneusly in groups

-Fast mixing makes it possible

to bring the most important aditives close to the headbox

to increase efficiency

Jet Injection Mixing for papermaking additives

250 installation in 20 countries:

Typical results:

- quality and process improvements

- reduced additive consumption

- total elimination of fresh water in dilution

-reduced energy consumption

-reduction of CO 2 emission

Jet Injection Mixing for papermaking additives

Total Annual Water and Energy Saving with 250 installations:

BTU) energy saving corresponding to more than 800.000 oil barrels

PATENTED Jet Injection mixing technology

Content 4 Result

and improvement of FPR

by reduction of dilution water

prolonged lifetime of wires and felts

Content 4 Result

and improvement of FPR

by reduction of dilution water

prolonged lifetime of wires and felts

110

100

40 60 80 100 120

Before ECF

After ECF

With Trumpjet

”Jet Injection mixing”

Reduction of retention aids

-35%

Improvement of Total FPR

67

75

40 50 60 70 80 90

Coat Base Paper

Fine Paper

Book Paper

Jet Injection mixing

Improvement of Ash FPR

30

42

20 30 40 50 60 70

Coat Base Paper

Fine Paper

Book Paper

Content 4 Result

and improvement of FPR

by reduction of dilution water

prolonged lifetime of wires and felts

Saving energy

by reduction of dilution water

Content 4 Result

and improvement of FPR

by reduction of dilution water

prolonged lifetime of wires and felts

0.09

0.00 0.10 0.20 0.30 0.40 0.50

Coat Base Paper

Fine Paper

Book Paper

Jet Injection mixing

Ash consistency of white water

1,949

0 500 1,000 1,500 2,000 2,500 3,000 3,500

Coat Base Paper

Fine Paper

Book Paper

BeforeWith TrumpJet Jet Injection mixing

Ash flow rate passing through wire

-44%

Jet Injection mixing

Wire wearing rate

TOP.W

-19%

After 60days Untouched Scratched

Before

With TrumpJet

Improvement of AKD dirt on top wire

With Jet Injection mixing

Prolonged lifetime of wires

Total consistency of press white water

0.08

0.05

0.00 0.05 0.10 0.15 0.20

Coat Base Paper

Fine Paper

Book Paper

Jet Injection mixing

Felt wearing rate

PuF -23%

4PF -47%

(*) ‘FPR improvement’ + ‘optimization of felt conditioner’

Jet Injection mixing

Prolonged lifetime of felts

Extending shut down cycle

Content 5 “Step two”

C-PAM + AKD with Jet Injection mixing after the screen

Present machine flow, PM7

P

C-PAM

With new Jet Injection Mixing, machine flow, PM7

P

C-PAM + AKD

Concept of laboratory test, PM7

Drainage

Simulation of present mixing points

(*) Tested at Mütec DFS retention analyzer

C-PAM + AKD after machine screen

A-PAM after machine screen

Simulation of new chemical mixing points

Result of laboratory simulation

10 15 20 25 30 35 40 45 50

Conclusion of installation in PM7

Ü Possibility to reduce AKD by Jet Injection Mixing

Ü Possibility to reduce retention aids still more because of success in the first Jet Injection Mixing

Ü Decision to install TrumpJet Chord for CPAM and AKD

Ü Installation in October, 2008.

Conclusion of installation in PM7 for CPAM & AKD

CPAM and AKD

Optimization of wet-end at PM7

A) Optimization of retention systemB) Stabilization of electric charge of white waterC) Optimization of biocide

D) Optimization of felt conditioner

Mixing stations

Ü By “Jet Injection Mixing” (and optimization of wet-end),

Great reduction in production cost

Increase in productivity by 3.5%

Ü Planning to adapt Jet Injection technology to other

chemicals

One of THE solutions of ‘optimization of wet-end’

Ü ‘Change chemicals’ + ‘Improved equipment’

î More effective result

MITSUBISHI PAPER MILLS LIMITED

Technologies

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