Lecture 5 - Mechanical Engineering

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Modes of particle combustion / Mechanical Engineering 29-11-2012 11
Modes of particle conversion • Shrinking sphere: particle surface combustion, products leave particle as they are produced • Shrinking core: combustion on a reaction core, with build up of an ash/char layer • Shrinking density: uniform combustion inside the particle, conserved particle size, decrease of density / Mechanical Engineering 29-11-2012 12
Page 1 and 2: Energy from Biomass 4S610 Lecture 5
Page 3 and 4: Energy from biomass Course outline
Page 5 and 6: Particle conversion: what happens
Page 7 and 8: Particle heating in different react
Page 9 and 10: Pulverized fuel combustion 8 / Mech
Page 11: Modeling conversion of spherical pa
Page 15 and 16: I Shrinking density particle combus
Page 17 and 18: Particle conversion Looking at oxyg
Page 19 and 20: Particle conversion Equimolar condi
Page 21 and 22: Particle conversion • Results in
Page 23 and 24: Solution • This yields: • With
Page 25 and 26: Solution: Th Th R k / p Ox D eff T
Page 27 and 28: Summary • Typical time scales and
Page 29 and 30: II Shrinking sphere model for liqui
Page 31 and 32: Combustion of liquid particles: Spa
Page 33 and 34: Droplet evaporation (shrinking sphe
Page 35 and 36: Evaporation time:D square law • O
Page 37 and 38: What is K, the mass conversion rate
Page 39 and 40: What is K • After some math: 4r 8
Page 41 and 42: Droplet evaporation: exercise • C
Page 43 and 44: Droplet burning: species profiles /
Page 45 and 46: Important results • Burn out time
Page 47 and 48: Droplet burning experiments / Mecha
Page 49 and 50: Evaluation • Constant burning rat
Page 51 and 52: Modes of particle evaporation & com
Page 53 and 54: Application in turbulent systems: f
Page 55 and 56: Different modes / Mechanical Engine
Page 57 and 58: Turbulent (group) combustion / Mech
Page 59: Questions / Mechanical Engineering

Lecture 5 - Mechanical Engineering

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