Combustion Basics | CleanBoiler.org
LP or Natural Gas Fired Appliance Combustion Products
A Guide to LP or Natural Gas Fired Appliance Combustion Products found in Flue Gas Exhaust. Natural gas, currently supplying about 22% of energy in the U.S., has been used as a fuel since its development by the Chinese more than 2500 years ago.
Selective non-catalytic reduction involves the injection of a NOx reducing agent, such as ammonia or urea, into the boiler exhaust gases at a temperature of approximately 1400-1600°F. The ammonia or urea breaks down the NOx in the exhaust gases into water and atmospheric nitrogen. Selective non-catalytic reduction reduces NOx up to 70%.
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emissions from natural gas-fired boilers and furnaces include nitrogen oxides (NOx), carbon monoxide (CO), and carbon dioxide (CO 2 ), and trace amounts of sulfur dioxide (SO 2 ), particulate matter (PM), organic compounds, and other greenhouse gases.
The products of full combustion for natural gas primarily consist of carbon dioxide, water vapor, nitrogen and excess oxygen. The oxygen supply for combustion usually comes from air. Because air contains a large amount of nitrogen, the required volume of air is much larger than the required volume of oxygen.
CO2, CH4, and N2O emissions are all produced during natural gas combustion. In properly tuned boilers, nearly all of the fuel carbon (99.9 percent) in natural gas is converted to CO2 during the combustion process. This conversion is relatively independent of boiler or combustor type. Fuel carbon