COMBUSTION OF LIQUID FUELS COMBUSTION AND FUELS
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1 COMBUSTION OF LIQUID FUELS
2 PHASES OF LIQUID FUEL BURNING Two phases of liquid fuel burning: a) phase of liquid evaporation, b) phase of vapour burning. Cloud of vapour Droplet of fuel
3 DOMINATING FACTORS OF OIL COMBUSTION - liquid evaporation, - mixing of vapour and oxidizer (air), - chemical kinetics of combustion in gas phase.
4 INFLUENCE OF GEOMETRY ON THE COMBUSTION PATTERN kinetic flame evaporation droplets + air przewodzenie heat conduction ciepła diffusion flame air droplet of fuel diffusion air soot radiation liquid fuel size [m]
5 BURNING OF SINGLE OIL DROPLET oxidizer vapour droplet products of combustion τ s = kd 0 2 vapour oxidizer flame Diffusion model of single oil droplet combustion: a) flame geometry, b) temperature and fuel C f /oxygen C O2 content
6 TIME OF BURNOUT OF A SINGLE OIL DROPLET Time of burnuot τ s : τ s = kd 0 2 d o initial diameter, k coefficient.
7 INFLUENCE OF FLOWFIELD ON THE COMBUSTION PATTERN flame droplet border of heated area fuel oxygen fumes gas flow a) Influence of natural convection, b) Influence of forced convection (1 flow, 2 droplet, 3 recirculation zone)
8 INFLUENCE OF INNER ROTATION OF LIQUID ON THE COMBUSTION PATTERN
9 Influence of droplet evaporation on the combustion pattern
10 BURNING OF A SINGLE DROPLET OF HEAVY OIL Four phases of combustion: I time of induction ignition ended with ignition of light fractions of oil, II burning evaporation, cracking of heavy fractions of oil, formation of coke shell, III micro explosion destruction of coke shall, IV burnout of coke shall.
11 HISTORY OF A SINGLE DROPLET BURNING (part 1)
12 HISTORY OF A SINGLE DROPLET BURNING (part 2)
13 TEMPERATURE HISTORY OF A SINGLE DROPLET BURNING
14 COKE SHALE FORMATION AND RESIDUE Shell formation Coke shell fuel droplet coke shell fragments of the broken coke shell
15 OIL-COKE MICROSCOPE PHOTO
16 PATTERNS OF OIL DROPLETS BURNING IN FLAME Group combustion diffusion flame
17 STRUCTURE OF DISPERSED OIL FLAME
18 STRUCTURE OF DISPERSED OIL FLAME: 1D - MODEL oil droplets + air fumes flow dirrection
19 STRUCTURE OF SPRAYED OIL FLAME stream of sprayed fuel, 2 zone of evaporation, 3 zone of ignition, 4 zone of combustion of individual droplets, 5 boundary of flame
20 STRUCTURE OF SWIRLED OIL FLAME oil spraying zone air recirculation zone
21 INFLUENCE OF SPRAY PATTERN ON THE OIL-FLAME STRUCTURE
22 TWO TYPES OF SPRAY PATTERN: A HOLLOW B SOLID
23 HOLLOW CONE PLAME PATTERN
24 FULL (SOLID) CONE PLAME PATTERN
25 Structure of swirled oil flame
26 Structure of swirled oil flame
27 OIL BURNERS
28 COMPACT OIL BURNERS Compact oil burner has three main units: oil atomisation, aerodynamics, control.
29 SCHEME OF COMPACT OIL-BURNER oil pump oil pressure regulator ignition ignition electrodes transformer nozzle oil filter oil supply unit cut off valve head of burner ignition transformer fan
30 EXAMPLE OF COMPACT OIL BURNER
31 COMPACT OIL BURNER INSTALLED IN A BOILER
32 HEAVY OIL BURNERS OF THE LANCE TYPE
33 HEAVY OIL LANCE BURNER FOR BOILERS START UP 1 diffuser, 2 lance, 3 electric igniters air box (P steam, M mazout, P1, P2 primary and secondary air)
34 LANCE OF MAZOUT BURNER steam oil
35 PARAMETERS OF MAZOUT AND STEAM IN START-UP BURNER Parameter Unit Value Mazout pressure MPa Mazout temperature o C Steam pressure MPa Steam temperature o C 230
36 LOCATION OF MAZOUT BURNER IN SWIRL BURNER
37 MAZOUT BURNER IN BOILER FURNACE
38 SCANNER OF MAZOUT FLAME IN BOILER FURNACE FIREYE InSight type 95
39 LAMP OIL BURNER wick
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