Haraldrud Municipal Solid Waste Combustion Plant in Oslo: Optimizing, Stabilizing and Modeling the Combustion Process
This thesis has studied Haraldrud MSW combustion process. Haraldrud is a real
combustion plant burning waste for citizens of Oslo. A thoroughly description of
the combustion process has been presented based on manipulating and analyzing the
process, together with long discussions with the plant engineers. Working with a real
plant is time-consuming, challenging and very informative. Rarely theories are easy
to implement on a real plant, and the focus of this thesis has been to connect theory
and practice. All simulations are based on real process data.
Burning MSW is a complex process to control, and several factors including;
unknown calorific value, regulation of the waste flow, and the long time constant for
measuring and regulating the energy contributes to this. Todays unknown calorific
value and measuring the energy from the combustion can be calculated from flue gas
measurements. By implementing these in a new controller at Haraldrud the variation
in energy from the combustion will be reduced and results in waste flow increase.
One method to develop a model and estimate the model parameters is to decide a
model set and estimate the model parameters based on system identification theory.
An open-loop system identification test was applied to the combustion process. Further,
the model parameters to a MIMO ARX model were estimated from recorded
test data. It was concluded that the process variation in the gathered open-loop
data was too large, which resulted in a poor model. The model should instead be
estimated based on closed-loop identification.
Another method to estimate the model parameters is to use a control law to
estimate the parameters on-line. Gradient method is one control law and has been
validated from recorded process data. The simulation shows that the estimated and
measured outputs followed each other perfectly.
Place, publisher, year, edition, pages
Institutt for teknisk kybernetikk , 2011. , 96 p.
ntnudaim:5897, MTTK teknisk kybernetikk, Reguleringsteknikk
IdentifiersURN: urn:nbn:no:ntnu:diva-13233Local ID: ntnudaim:5897OAI: oai:DiVA.org:ntnu-13233DiVA: diva2:435642
Imsland, Lars, Professor