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Presentation of some researches Covered by the Working Group 2 Jean-Claude ROUX Laboratory of Pulp and Paper Science and Graphic Arts, CNRS PowerPoint PPT Presentation


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Presentation of some researches Covered by the Working Group 2 Jean-Claude ROUX Laboratory of Pulp and Paper Science and Graphic Arts, CNRS Grenoble Institute of Technology – Pagora 461 rue de la Papeterie, 38 400 Saint-Martin d’Hères, France [email protected]

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Presentation of some researches Covered by the Working Group 2 Jean-Claude ROUX Laboratory of Pulp and Paper Science and Graphic Arts, CNRS

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Presentation of some researches

Covered by the Working Group 2

Jean-Claude ROUX

Laboratory of Pulp and Paper Science and Graphic Arts, CNRS

Grenoble Institute of Technology – Pagora

461 rue de la Papeterie, 38 400 Saint-Martin d’Hères, France

[email protected]

COST FP 1005 – Fiber suspension flow modelling: a key for innovation and competitiveness in the pulp and paper industry

13-14 October 2011 - Nancy

1


Outline

Presentation of our Laboratory of Pulp and Paper Science and Graphic Arts

Some researches covered by WG1 (Martine RUEFF)

Some researches in the fields covered by WG2

2


Presentation of our Laboratory

Laboratory of Pulp and Paper Science and Graphic Arts = LGP2

composed of 5 research teams:

*Chemical Processes – Biorefinery – Pulping –Bleaching – Bioproducts

*Papermaking Engineering and Environment

*Paper Physics

*Printing and Graphic Arts

*Biomaterials for Packaging

35 Ph-D students – 10 Ph-D thesis are defended each year

3


Some researches covered by WG2

How can we use some rheological concepts for understanding the complex behaviour of flowing pulp suspensions in the unit operations of papermaking science?

- Consider a single-phase Eulerian modelling > shear rate,pulp apparent viscosity : what is the meaning of this last tool simultaneously in terms of :

  • *reduction of theenergy consumption for a given operation?

  • *optimization of pulp and paper properties?

    - Application to disintegration and refiningoperations of pulp suspensions will be given

4


Some researches covered by WG2

Disintegration operation (2 Ph-D thesis among 2 on the theme)

FABRY (1999) : «Rheology of concentrated pulp suspensions in order to improve their recycling »

AMARAL (2001): « Disintegration of pulp : characterization and quantification of the effects »

Refining operation (2 Ph-D thesis among 5 on the theme)

RADOSLAVOVA (1996): «Hydrodynamic modelling of the refining process of pulp suspensions »

BORDIN (2008): «Study of the modification of the rheological behaviour of pulp suspensions during the refining operation »

5


Disintegration process: special case of pulp deinkingFABRY(1999)

*New objectives: waste paper defibreing, ink detachment without fragmentation, speck decontamination

*An extension of the METZNER & OTTO’s method (1957) provides an interesting tool to integrate the overall friction phenomena:

- generalisation of the apparent viscosity to a shear-factor studied in a Hobart planetary mixer

- furnish: 100% ONP (Old NewsPrint)


Disintegration processFABRY(1999): master curve with water-glycerol mixtures

Flat beater Hook impeller


Disintegration processFABRY(1999): analysis of the overall friction in the mixer

The shear-factor function of the consistency and the impeller geometry


Disintegration processFABRY(1999): master curve for defibreingin a planetary mixer

Net cumulative energy consumed


Disintegration processFABRY(1999): master curve for ink fragmentationin a planetary mixer

Net cumulative energy consumed


Pulp disintegration process: physical descriptionand generalization given byAMARAL et al.(2000)

- The process kinetic follows a law of evolution which includes an average shearing stress in the bulk

- The Rayleigh’s law can be applied and all the friction forces may be incorporated in a “viscous form” called a shear-factor

and

are 2 numerical constants to be determined


Application to the experimental data already published

MERRETT(1987), SAVOLAINEN(1991), AMARAL et al.(2000)


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Application to the experimental data already published

MERRETT(1987), SAVOLAINEN(1991), AMARAL et al.(2000)


Publications in journals

On the operation of pulp disintegration:

AMARAL, M.E., RENAUD, M., ROUX, J.C.,

« Cinétique de désintégration des pâtes à papier : modélisation du phénomène »

Revue A.T.I.P., 54, (3-4), pp 76-84, juillet-septembre 2000

FABRY, B., ROUX, J.C., CARRE, B.,

« Characterization of friction during pulping : an interesting tool to achieve good deinking »

Journal of Pulp and Paper Science, 27, (8), pp 284-288, août 2001

ROUX, J.C., FRANC, N., DUFFY, F.F., FABRY, B.,

« Shear factor : a new way to characterize fiber suspension shear »

TAPPI Journal, 84, (8), août 2001

FABRY, B., ROUX, J.C., CARRE, B., DUFFY, F.F.,

« Shear factor : a new way to characterize pulper performance »

TAPPI Journal-Peer Reviewed Paper Solutions, 84, (11), novembre 2001

ROUX, J.C.,

“Review paper on pulp treatment processes”

The Pulp and Paper Fundamentals Research Soc., FRC Editor, Oxford, pp 19-80, sept. 2001

VILASECA F., PUIG J., PELACH M.A., El-MANSOURI N.E., ALCALA M., ROUX J.-C., MUTJE P.,

Study and modelling of the disintegration kinetics of coated paper

BioResources 6 (2), 1659-1669, 2011


Presentation of the project on the refining operation

J.-C. Roux, J.-F. Bloch, G. Besançon

Title: Energetic optimization of the running of refiners in the paper industry

Statement: for the refining operation, in 2009, the French electricity consumption for all paper companies climbs until : 200 kWh/T . 8 330 000 T/an

= 1,67.109 kWh/an

5% of the reduction of the electricity consumption for the refining operation represents 8,33 107 kWh/an, or 8,33 M€/an

Understand for a better control the refining operation

in terms of a multivariate non linear process

2011


Pnet

SP

+

Motor Refiner Sensors + Model for the

Controller electrical disc Acquisition C total P

-

Model of the no-load P e N

-

Calculated net P

+

Calculated total P

Exemple of a control scheme for the refiner running with a constant set point (SP) for the net power


International context and difficulties

(1) influence of variables : raw materials

(2) influence of geometric parametersand running conditions

(3) Model of knowledge

Difficulties :Sensors (real or virtual)

Optimal control / energetic criteria


Publications in journals only -1

Our expertise on the refining operation understanding:

ROUX, J.C., CHU, J., JORIS, G., CAUCAL, G.,

« Théorie hydro-mécanique du fonctionnement d’un raffineur à basse concentration »

Revue A.T.I.P.,53, (4-5), pp 106-116, septembre-octobre 1999

ROUX, J.C., MAYADE, T.,

« Modeling of the particle breakage kinetics in the wet mills for the paper industry »

Powder Technology, 105, (1-3), pp 237-242, novembre 1999

ROUX, J.C., JORIS, G.,

« Specific Edge Load: advantages and drawbacks »

Japanese Journal of Paper Technology, 46, (10), pp 55-59, octobre 2003

ROUX, J.C., JORIS, G.,

« Angular parameters beyond specific edge load »

TAPPSA Journal, Technical Asso. Pulp and Paper Industry South Africa, mai 2005

ROUX, J.C., JORIS, G.,

« Radial distribution of the pressure in an industrial refiner »

13rd Fundamentals Research Symposium : Advances in Paper Science and Technology, 1, pp 409-425

PIRA Editions, 2005

DIETEMANN, P., ROUX, J.C.,

« A study of disc refiner running in no-load conditions »

Cellulose Chemistry and Technology, 39, (5-6), pp 459-471, 2005


Publications in journals only - 2

On the refining operation:

ROUX, J.C., BLOCH, J.F., NORTIER, P.,

“A kinetic model for pulp refining, including the angular parameters of the equipment”,

Appita Journal, 60, (1), pp 29-34, January 2007

BORDIN, R., ROUX, J.C., BLOCH, J.F.,

“Global description of refiner plate wear in low consistency beating”,

Nordic Pulp and Paper Research Journal, 22, n°4-2007, pp 529-534

BORDIN, R., ROUX, J.C., BLOCH, J.F.,

“New technique for measuring clearance in low-consistency refiners”,

Appita Journal, 61, (1), pp 71-77, January 2008

BORDIN, R., ROUX, J.C., BLOCH, J.F.,

“No-load power evolution during low-consistency pulp beating”,

Nordic Pulp and Paper Research Journal, 23, n°1-2008, pp 34-38

ROUX, J.C., BLOCH J.-F., R. BORDIN and P. NORTIER

« The net normal force per crossing point: a unified concept for the low consistency refining of pulp suspensions »

14th Fundamental Research Symposium : Advances in Pulp and Paper Research, 1, pp 51-83

Cambrian Printers, 2009


Proposed scheme of research for this project

Phase 1 – (4 months)

Bibliographical work: at the interface between the paper engineering and the process control

Phase 2- (8 months)

Development of the experimental pilot (specific sensors) (LGP2)

Phase 3- (8 months)

Development of a first attempt of optimal control (GIPSA Lab)

Phase 4 – (6 months)

Valorisation (conferences and articles in journals)

Phase 5 – (10 months)

Extension to other types of refiners (depending on the advancement of the project)


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