Page 141 - Wastewater Solids Incineration Systems
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108 Wastewater Solids Incineration Systems
FIGURE 6.3 A fraction of flue gas energy required for combustion air preheat (0.5556
[°F 32] °C).
ther heat recovery and reuse downstream of the primary air preheater. Accordingly,
once the desired combustion air preheat is achieved, other uses for energy recovered
from the exhaust flue gas should be considered. These options fall into the general
category of secondary energy recovery.
A variety of heat recovery systems exist that can take advantage of energy
in exhaust flue gases from fluidized bed systems downstream of the primary air
preheater:
• Several types of waste heat recovery boilers that can produce steam for
process uses or for power generation.
• Heat exchangers that can produce hot thermal fluids for process use.
• Heat exchangers to produce hot water for process or building heating use, or
both.
• Heat exchangers to produce hot air or flue gas for exhaust gas reheating.
