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MOBE: Final report; Modelling and Optimization of Biomass-based Energy production

Abstract

The present report is the documentation of the work in the PSO-project MOBE, ''Modelling and Optimization of biomass-based Energy production''. The aim of the project is to develop better control methods for boilers in central power plant units, so the plant will achieve better controllability with respect to load changes. in particular focus is on the low load operation near and below the Benson point. The introduction of the report includes a description of the challenges the central power stations see in the modern electricity market where wind power delivers a significant prioritized production, and thus, in connection with consumption variations, contributes to the load requirements of the central units. The report documents the work on development of a common simulation platform for the partners in the project and for future model work. The result of this is an integration between the DTU simulation code DNA and Matlab. Other possible tools are suggested. The modelling work in the project has resulted in preliminary studies of time constants of evaporator tubes, an analysis that shows that Ledinegg instabilities do not occur in modern boilers even at low load, development of a validated evaporator model that can be coupled to tools for  More>>
Authors:
Trangbaek, K; [1]  Elmegaard, B [2] 
  1. Aalborg Univ., Institut for Elektroniske Systemer, Aalborg (Denmark)
  2. Danmarks Tekniske Univ., Institut for Mekanisk Teknologi, Kgs. Lyngby (Denmark)
Publication Date:
Jul 01, 2008
Product Type:
Miscellaneous
Report Number:
NEI-DK-5557
Resource Relation:
Other Information: PSO-2002; 71 refs., 95 figs., 4 tabs.
Subject:
09 BIOMASS FUELS; 20 FOSSIL-FUELED POWER PLANTS; BIOMASS; COMPUTERIZED SIMULATION; COMBUSTION CONTROL; BOILERS; MATHEMATICAL MODELS
OSTI ID:
1034452
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: Contract FORSKEL 4114; TRN: DK1201037
Availability:
Also available at http://www.risoe.dtu.dk/rispubl/NEI/NEI-DK-5557.pdf; OSTI as DE01034452
Submitting Site:
DK
Size:
147 pages
Announcement Date:
Feb 10, 2012

Citation Formats

Trangbaek, K, and Elmegaard, B. MOBE: Final report; Modelling and Optimization of Biomass-based Energy production. Denmark: N. p., 2008. Web.
Trangbaek, K, & Elmegaard, B. MOBE: Final report; Modelling and Optimization of Biomass-based Energy production. Denmark.
Trangbaek, K, and Elmegaard, B. 2008. "MOBE: Final report; Modelling and Optimization of Biomass-based Energy production." Denmark.
@misc{etde_1034452,
title = {MOBE: Final report; Modelling and Optimization of Biomass-based Energy production}
author = {Trangbaek, K, and Elmegaard, B}
abstractNote = {The present report is the documentation of the work in the PSO-project MOBE, ''Modelling and Optimization of biomass-based Energy production''. The aim of the project is to develop better control methods for boilers in central power plant units, so the plant will achieve better controllability with respect to load changes. in particular focus is on the low load operation near and below the Benson point. The introduction of the report includes a description of the challenges the central power stations see in the modern electricity market where wind power delivers a significant prioritized production, and thus, in connection with consumption variations, contributes to the load requirements of the central units. The report documents the work on development of a common simulation platform for the partners in the project and for future model work. The result of this is an integration between the DTU simulation code DNA and Matlab. Other possible tools are suggested. The modelling work in the project has resulted in preliminary studies of time constants of evaporator tubes, an analysis that shows that Ledinegg instabilities do not occur in modern boilers even at low load, development of a validated evaporator model that can be coupled to tools for control system development, and an analysis of two different configurations at the low load system of Benson boilers. Based in a validated power plant model different control strategies have been studied. Because constraints on control signals and temperature gradients are dominating, it is recommended to use model predictive control. It is demonstrated, how such a simulator can handle large low gradients without violating the constraints. By switching between different linearized models the whole load range may be covered. The project indicates that Model predictive control can improve the control in low low significantly. This should be studied further in future projects by realistic tests. At first these should be done with a simulator based on first principles and after this on a real boiler. The model work in MOBE has made the basis for an applicable model but this should be developed further to better understand the evaporator process and its coupling to the rest of the plant, particularly reheat. The models developed in the project are based on several simplified assumptions. These assumptions will have to be evaluated in future work by more focus on the real operation of Benson boilers with different fuels. (Author)}
place = {Denmark}
year = {2008}
month = {Jul}
}