dynamic visualisation of the combustion processes in boilers
DESCRIPTION
Dynamic visualisation of the combustion processes in boilers. Marek Gayer [email protected] Computer Graphics Group Department of Computer Science and Engineering Faculty of Electrical Engineering of CTU Prague. Simulation of c ombustion processes. - PowerPoint PPT PresentationTRANSCRIPT
Dynamic visualisation of the combustion processes in
boilers
Dynamic visualisation of the combustion processes in
boilers
Marek [email protected]
Computer Graphics Group
Department of Computer Science and Engineering
Faculty of Electrical Engineering of CTU Prague
2
Simulation of combustion processesSimulation of combustion processes
To find an optimal boiler configurations and optimal mode of boiler exploitation.
(both for the ecological and economical reasons)– To lower pollution– To find a way for
optimal fuel preparation (particle sizes and quantity, speed etc.)
3
Current solutions – CFDCurrent solutions – CFD
Based on solving complex differential equations (such as the Navier Stokes)
Advantages: Precise, robust, well-known Combustion processes in FLUENT
Main drawback : SLOW
4
Our methodologyOur methodology
Based on an different approach Fast enough to enable real-time
visualisation / simulation Allows on-line change of some parameters Enables view of process of combustion Usable as a fast tool for boiler designers Suitable for education
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Particle systemParticle system Used for BOTH the simulation
of the technological problem and visualisation
Concept of virtual particles Quality & speed of
visualisation could be enhanced by increasing number of particles
Movement of particles strongly determinated by the Flow array
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Flow arrayFlow array Precalculated array of
vectors of the speed Divides the area of the
boiler to the voxelized space
Computed only once at the beginning of simulation
FAST computation using isotherm free stream – see the paper
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Flow array – sample visualisationFlow array – sample visualisation
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Simplified Combustion and heat transferSimplified Combustion and heat transfer
The temperature array Combustion issues:
– Temperature above ignition– Part of the coal to burn depends on the
temperature and mass of the coal and air– The released heat is distributed to the
particles– Heat radiation between the walls
T = 303K(above ignition)
t = 0 seconds
Coal particle
Air particle
Partially burned coal particle
A
C
C
CA
A A
T = 305K(increased)
t = 0.01 seconds
Coal particle (partially burned)
Air particle (decreased m)
Coal particle transformed to burned gas particle
A
C
B
CAA
B
E
F
O
R
E
A
F
T
E
R
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VisualisationVisualisation
OpenGL graphics system Particle system visualisation Visualisation of the Flow Array and
temperature array
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Particle system, temperature vizualizationParticle system, temperature vizualization
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ResultsResults
Pararameter Our system FLUENT 5
Average Temperature 1029 oC 1158 oC
Outlet Temperature 1151 oC 1384 oC
Max Temperature 3010 oC 2753 oC
Stream velocity 23 m/s 17 m/s
Average outlet velocity 28 m/s 21 m/s
Wattage 192 W/m3 232 W/m3
Mass total 21.1 kg 21.3 kg
Converge time Below 1 min 7 hours
Real-time visualisation/simulation
Enabled, 10 FPS
Not available
13
ConclusionConclusion
Results comparable with standard methods Very fast simulation and visualisation speed Future plans
– more accurate heat distribution– Simulate and monitor additional
characteristics– Improved Flow Array