Page 274 - Mechanical Engineers' Handbook (Volume 4)

10 Burner and Control Equipment 263

Figure 41 Air/gas ratio control by air inspirator. 1

Oil should be atomized before combustion in order to provide a compact flame pattern.
Flame length will depend on burner port velocity and degree of atomization. Atomization
can be accomplished by delivery of oil at high pressure through a suitable nozzle; by inter-
mediate pressure air, part or all of the combustion air supply, mixing with oil at the discharge
nozzle; or by high-pressure air or steam. For firing heavy fuel oils of relatively high viscosity,
preheating in the storage tank, delivery to the burner through heated pipes, and atomization
by high-pressure air or steam will be needed. If steam is available, it can be used for both

1
Figure 42 Dual fuel burner with removable oil nozzle. (Courtesy Bloom Engineering Company.)