Energy and Quality oriented modeling and control of REFiners

Transkript

1 The northernmost University of Technology in Scandinavia Top-class Research and Education Energy and Quality oriented modeling and control of REFiners Wolfgang Birk

2 Innehåll Status information om projektet ProMoVis Open Source Medlemskap i OProVAT Experiment Uppstart av MPC aktiviteten Analys av modeller för raffinörer Miguel kommer att disputera 29 november 2012! BFP Skogs och träindustrins avslutningskonferens (VINNOVA) januari 2013, Stockholm Wolfgang Birk Control Engineering Group LTU Sida 2

3 Activities Wolfgang Birk Control Engineering Group LTU Sida 3

4 Project plan Project plan - EQoRef - Version 0.1 Work package / Task ID Title J F M A M J J A S O N D J F M A M J J A S O N D WP-I: Quality oriented refiner modeling T1.1 Energy modeling T1.2 Quality modeling WP-II: Structure and performance criteria T2.1 ProMoVis decision making T2.2 Energy-quality balance optimisation T2.3 Constrained structure effects WP-III: Quality oriented MPC scheme T3.1 Energy-quality oriented control scheme T3.2 Structured quality oriented control scheme WP-IV: Test & Verifiering T4.1 Experiment and evaluation project T4.2 Modeling test campaign T4.3 Control test campaign WP-V: Result transfer T5.1 Halfway workshop T5.2 Tutorial and workshop WP-VI: Project management T6.1 Kick-off T6.2 Steering team meeting 1 T6.3 Steering team meeting 2 T6.4 Steering team meeting 3 T6.5 Steering team meeting Wolfgang Birk Control Engineering Group LTU Sida 4

5 ProMoVis Wolfgang Birk Control Engineering Group LTU Sida 5

6 ProMoVis Open Source ProMoVis är nu tillgänglig som Open Source Copyright and IP-rättigheter kommer att ägas av OProVAT EF ProMoVis är gratis, men för att kunna ha en inverkan på den framtida utvecklingen så måste man vara medlem i OProVAT Alla deltagare i SCOPE är välkommen som medlemmar i OProVAT Tredje parter som vill vara med i OProVAT måste beviljas medlemskap av styrelsen. Ansökan ska stödjas av medlemmar i OProVAT. Wolfgang Birk Control Engineering Group LTU Sida 6

7 ProMoVis Open Source Nedladdningar Ingen marknadsföring! Totalt 32 Sourceforge -> ProMoVis Recommendations 1 från utanför SCOPE Wolfgang Birk Control Engineering Group LTU Sida 7

8 Medlemskap i OProVAT EF 500kr 8500kr 8500kr Wolfgang Birk Control Engineering Group LTU Sida 8

9 Experiment Vi har inte kunnat genomföra experiment i anläggningen ännu. => Fokus på modelleringsarbete och modelanalys i huvudsak. Möte med Metso i Sundsvall gav en del nya perspektiv Osäkert om temperaturmätning i spalt kommer leder till bra resultat Variationerna på massan på inflödessidan mycket avgörande Analys av raffinören bör göras med hänsyn till detta Temperaturmätning TDC mätare ska nyttjas Ger oss information om spalt och om temperatur i en punkt Wolfgang Birk Control Engineering Group LTU Sida 9

10 Raffinören i en mälderiprocessen 1-5 sekunder ~0.3s Wolfgang Birk Control Engineering Group LTU Sida 10

11 Reglering av raffinören Samarbete med ett universitet I Grekland och uppstart av ett examensarbete om Model Predictive Control of a Pulp & Paper Refiner Just nu pågår val av kandidater. Framtagning av 1. en enkel reglerorienterat model 2. MPC strategy med energibegränsningar Förberedelse av en survey artikel, A survey on Control Approaches for Pulp Refiners, som sammanfattar literatursökning kring styrning av raffinörer. Wolfgang Birk Control Engineering Group LTU Sida 11

12 Modellering av raffinörer Över till Patrick Wolfgang Birk Control Engineering Group LTU Sida 12

13 The northernmost University of Technology in Scandinavia Top-class Research and Education Assessment of Models for HC Refining Patrick Höhn

14 Outline Introduction Overview of existing models Model Analysis Simulation Study Future Work

15 Introduction Collection of Existing models Which are are applicable? Which are the significant parameters?

16 Introduction Refiner r 2 r 1

17 Introduction Refiner Shopper Riegler Angular velocity Geometric properties Inlet Consistency Specific Energy Mass flow rate Inflow temperature Output Consistency Gap Clearance Outflow Temperature Shopper Riegler Temperature Profile Shear Force

18 Overview of existing models Flow velocity model by Fox Gives insights in viscosity measurements Consistency model by Miles and May Comparison with Entropy model Entropy model by Eriksson Well known model Enthalpy model by Qian Alternative approach to Eriksson

19 Overview of existing models Velocity model by Fox: Viscosity: p Local pressure µ viscosity u Flow velocity r Radial position L Gap clearance F Shear force A Area of sensor ω Angular Velocity

20 Overview of existing models Consistency Model by Miles and May: L C SE r r 1 r 2 Latent heat of steam Consistency Specific Energy Radial position Gap clearance Shear force

21 Overview of existing models Entropy model by Eriksson (1)

22 Overview of existing models Entropy model by Eriksson (2)

23 Overview of existing models Entropy model by Eriksson (3)

24 Overview of existing models Entropy model by Eriksson (4)

25 Overview of existing models Enthalpy model by Qian Symbol Explanation Symbol Explanation Steam mass flow rate Specific heat capacity pulp Water mass flow rate Specific heat capacity water Fiber mass flow rate Enthalpy of steam Inner radius Thermodynamic work Outer radius Temperature

26 Additions to the Entropy model Depends on enthalpy and entropy values of water and steam Can be determined by Steam Tables, e. g. IAPWS industrial formulation of thermodynamical properties Gives good accuracy but very complex equations for enthalpy and entropy

27 Additions to the Entropy model Simplification of entropy and enthalpy equations:

28 Addition to Entropy Model Relative Error

29 Sensitivity study - Results

30 Sensitivity study - Results 1. Inflowing water flow rate (dash dot dotted) 2. Temperature profile (solid) 3. Inflowing fiber flow rate(loosely dotted) 4. Angular Velocity (loosely dash dotted) 5. Viscosity (dash dotted) 6. Inflow consistency (dashed) 7. Radial discretization (dotted)

31 Simulation setup Gap Clearance 0.6 mm Specific Energy 305 kwh/t Input Consistency % Pulp flow rate 7 t/h Inner radius 0.47 m Inflow temperature 56.9 ºC Heat capacity of water 4.18 kj/(kg*k) Heat capacity of pulp 0.4 kj/(kg*k) Angular velocity 314 1/s Outer radius 0.68 m

32 Simulation study constant temperature

33 Simulation study linear rising temperature

34 Simulation study parabolic temperature

35 Conclusion and Future Work Temperature key parameter for mass flows in refiner Improve the Enthalpy model with radial dependency Experimental Study to validate Results

36 Questions?