System and method of reducing pulverizer flammability hazard and boiler nitrous oxide output
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United States of America Patent
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Aug 28, 2007
Grant Date -
N/A
app pub date -
Jun 10, 2004
filing date -
Jun 10, 2003
priority date (Note) -
Expired
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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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