Combustion Phenomena of High Temperature Air Combustion - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 121

F1 fuel nozzle
(conventional combustion)

Air Inlet

F2 fuel nozzle
(regenerative dispersed combustion)

Heavy oil combustion Gas combustion (Town gas) Gas combustion (C.O.G.)

FIGURE 2.84 Conditions of flame combustion on types of fuels.

Heavy oil A (Dispersed combustion)
City gas (Dispersed combustion)
COG (Dispersed combustion)
Heavy oil A (Concentrated combustion)

160

140

120

100

80

60

40

20

0

950 1000 1050 1100 1150 1200 1250

Temperature of preheated air, C

FIGURE 2.85 Comparison of preheated air temperatures and NO x emission by fuels and
combustion methods (in-furnace O 2 = 2.2 ~ 2.8%, in-furnace temperature (TIC) = 1270 ~
1320˚C). (TIC represents Temperature Indicator Controller.)

2.5 FUNDAMENTALS OF SOLID FUEL FLAMES

2.5.1 S OLID F UEL F LAME C HARACTERISTICS

The problem of global environmental pollution has become more serious and, there-
fore, in the field of solid fuel combustion the development of advanced combustion
technologies with environmental safeguards to burn more efficiently while restricting
emissions of pollutants is a necessity. But even if discussing only solid fuels, we
have many kinds such as biomass, coal, solid wastes, or rocket fuels and can find
various combustion types according to the types of solid fuels. In this section, we
review the combustion technologies for coal as a typical example of solid fuel and