boiler flue gas oxygen content suddenly increased

Measurement of Oxygen Concentration in Package Boiler Flue

Understanding the Impact of Excess Air | Firebridge

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Boiler Combustion | CleanBoiler.org

Oct 10, 2017 · There is a diminishing returns effect in oxygen content and performance for the unit. Too much available oxygen will lead to inefficient combustion. Over time, the unit will require unscheduled maintenance. Too little available oxygen causes unstable combustion and increased emissions. This will lead to flame loss faults and, once again, unscheduled maintenance.

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Understanding the Impact of Excess Air

May 01, 2017 · During the running of utility boiler, the flue gas oxygen content is one of the most important factors that affects boiler efficiency, and it affects each other with other thermal economic parameters such as flue gas temperature, unburned carbon in fly ash and slag and coal consumption of power supply. So it's a key parameter to optimize the combustion process of fuel in utility boiler

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Oxygen Control | CleanBoiler.org

The correct amount of excess air is determined from analyzing flue gas oxygen or carbon dioxide concentrations. Inadequate excess air results in unburned combustibles (fuel, soot, smoke, and carbon monoxide), while too much results in heat lost due to the increased flue gas flowthus lowering the overall boiler fuel-to-steam efficiency.

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Why Oxygen Levels Matter in High Efficiency Boilers

On the other hand, insufficient air intake causes incomplete combustion, resulting in increased smoke emission. Optimizing air intake for boiler operation requires continuous measurement of the oxygen concentration in the flue gas. The typical package boiler is a water tube boiler or flue and smoke tube boiler with a capacity of 5 to 20 t/h (average steam generation capacity).

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Why would a gas boiler make soot? - Google Groups

Excess air increase the amount of oxygen to the combustion and the combustion of fuel. when fuel and oxygen from the air are in perfect balance - the combustion is said to be stoichiometric 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.

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Combustion Efficiency and Excess Air

Additionally, it should be noted that flue gas oxygen content targets may be influenced by environmental controls; such as, nitrogen oxides (NO x) control. When a boiler is equipped with NO x control the minimum oxygen concentrations are sometimes higher than if the boiler was equipped with a standard burner without NO x control.

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