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Dynamic visualisation of the combustion processes in boilers Marek Gayer xgayer @ fel . cvut . cz Computer Graphics Group Department of Computer Science and Engin eering Faculty of Electrical Engineering of CTU Prague

Dynamic visualisation of the combustion processes in boilers Marek Gayer Computer Graphics Group Department…

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3 Current 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

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Page 1: Dynamic visualisation of the combustion processes in boilers Marek Gayer Computer Graphics Group Department…

Dynamic visualisation of the combustion processes in

boilersMarek [email protected]

Computer Graphics GroupDepartment of Computer Science and Engineering

Faculty of Electrical Engineering of CTU Prague

Page 2: Dynamic visualisation of the combustion processes in boilers Marek Gayer Computer Graphics Group Department…

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Simulation 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.)

Page 3: Dynamic visualisation of the combustion processes in boilers Marek Gayer Computer Graphics Group Department…

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Current 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

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Our 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 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 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 visualisation

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Simplified 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

Page 9: Dynamic visualisation of the combustion processes in boilers Marek Gayer Computer Graphics Group Department…

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

BEFORE

AFTER

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Visualisation OpenGL graphics system Particle system visualisation Visualisation of the Flow Array and

temperature array

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Particle system, temperature vizualization

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ResultsPararameter Our system FLUENT 5Average Temperature 1029 oC 1158 oC Outlet Temperature 1151 oC 1384 oC Max Temperature 3010 oC 2753 oC Stream velocity 23 m/s 17 m/sAverage outlet velocity 28 m/s 21 m/sWattage 192 W/m3 232 W/m3

Mass total 21.1 kg 21.3 kgConverge time Below 1 min 7 hoursReal-time visualisation/simulation

Enabled, 10 FPS

Not available

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Conclusion 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