Furnaces – Process – Treating fuel constituent or combustion product
Reexamination Certificate
2007-08-28
2007-08-28
Rinehart, Kenneth (Department: 3749)
Furnaces
Process
Treating fuel constituent or combustion product
C110S347000, C110S204000, C110S106000
Reexamination Certificate
active
10866355
ABSTRACT:
The present invention is a system and method of reducing nitrogen oxides in coal combustion exhaust gases and preventing fire and explosion in pulverized coal systems. The present invention first cools the flue gas exiting a boiler of the pulverized coal system with an air preheater. The present invention removes any particles such as fly ash from the cooled flue gas with an electro-static precipitor or a bag house and recirculates the flue gas. The temperature of the recirculated flue gas is adjusted to a desired temperature and is injected into the pulverizer with combustion air from the air preheater, creating a safer environment for pulverizing the fuel. This mixture of pulverized fuel, air and flue gas is then burned in the boiler, resulting in a cleaner output containing significantly less nitrous oxide.
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Burnett Thomas D.
Clark Kimble J.
Rettig Terry W.
Torbov T. Steven I.
Aptech Engineering Services, Inc.
Haverstock & Owens LLP
Rinehart Kenneth
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