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Dynamic visualisation of the combustion processes in boilers

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

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Dynamic visualisation of the combustion processes in boilers

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

  2. 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 optimalfuel preparation (particle sizes and quantity, speed etc.)

  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

  4. 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

  5. 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

  6. 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

  7. Flow array – sample visualisation

  8. 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

  9. T= 303K(above ignition) t = 0 seconds Coal particle Air particle Partially burned coal particle B E F O R E A A C A C A C T= 305K(increased) t = 0.01 seconds Coal particle (partially burned) Air particle (decreased m) Coal particle transformed to burned gas particle A F T E R A A C C A B

  10. Visualisation • OpenGL graphics system • Particle system visualisation • Visualisation of the Flow Array and temperature array

  11. Particle system, temperature vizualization

  12. Results

  13. 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

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