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Natural Gas Fired Boilers

Oct 23, 2013 · For natural gas-fired burners, the stoichiometric air required is 9.4-11 ft. 3 / 1.0 ft. 3 of natural gas or approximately an air-to-gas ratio of approximately 10:1. In this case, there is an excess oxygen level of 2%. In the combustion zone, it is challenging to measure excess air.

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Combustion Efficiency - an overview | ScienceDirect Topics

The combustion efficiency increases with increased excess air - until the heat loss in the excess air is larger than the heat provided by more efficient combustion. Typical excess air to achieve the highest possible efficiency for some common fuels: 5 - 10% for natural gas. 5 - 20% for fuel oil.

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Combustion Air - Natural Gas Efficiency

natural gas, NOx formation through the fuel NOx mechanism is insignificant. Carbon Monoxide - The rate of CO emissions from boilers depends on the efficiency of natural gas combustion. Improperly tuned boilers and boilers operating at off-design levels decrease combustion efficiency resulting in increased CO …

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Comparison Of Combustion Performance Between Natural Gas

The combustion of all fuels requires oxygen, and LOTS of it. Natural gas requires a minimum of 10 parts air for 1 part natural gas to support combustion. Other fuels are similar in their requirements. Often well intending – but not thinking – home owners restrict the combustion air to their heating appliances by

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Understanding Combustion Efficiency and Combustion Equations

Combustion Efficiency and Excess Air

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Flue Gas Analysis Table | CleanBoiler.org

(MMBtu) of natural gas while producing 45,000 lb/hour of 150-psig steam. Stack gas measurements indicate an excess air level of 44.9% with a flue gas minus combustion air temperature of 400°F. From the table, the boiler combustion efficiency is 78.2% (E1). Tuning the boiler reduces the excess air to 9.5% with a flue gas minus combustion

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Understanding Combustion Efficiency and Combustion - TEC

Combustion Efficiency and Excess Air

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What is the Air Fuel Ratio Effect on Combustion Efficiency?

Combustion efficiency decreases with increasing superficial gas velocity. Combustion efficiency initially increases with increasing excess air level and then decreases. This is believed to be due to an increase in CO and hydrocarbon emissions as the excess air level increases to higher levels [ 23 ].

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Improve Your Boiler's Combustion Efficiency

Typically the difference between the value of net combustion efficiency and the value of gross combustion efficiency for a natural gas fueled system is around 7-9% with the net value being higher than the gross value. During combustion, new chemical substances are created from the fuel and the oxidizer. These substances are called exhaust gasses.

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