what is the cause of boiler flue gas oxygen content

Water Handbook - Boiler System Failures | SUEZ

The application of a fast-acting oxygen scavenger such as catalyzed sodium sulfite also helps protect this vital part of the boiler. While oxygen pitting is the most common form of waterside corrosion that causes economizer tube failures caustic soda has occasionally accumulated under

Learn More

ANALYSIS OF FLUE GASES - Project Gutenberg

The total amount of excess oxygen in the flue gases is (O - ½CO); hence N - 3.782(O - ½CO) represents the nitrogen content in the air actually required for combustion and N ÷ (N - 3.782[O - ½CO]) is the ratio of the air supplied to that required. This ratio minus one will be the proportion of excess air.

Learn More

Understanding the Impact of Excess Air

Mar 15 2019 · Assuming the CO level in flue gas is very low and incomplete combustion can be neglected oxygen content in flue gas can be measured in two numbers: dry reading A% or wet reading B%. With those measurements the following formulas can be used to calculate excess air: For example if the oxygen dry reading in flue gas is 2.5% then the excess ...

Learn More

(PDF) Optimization of the Exhaust Gas Oxygen Content for ...

The oxygen content of flue gas [2] is an important metric of coal-fired boiler combustion operation and is closely related to boiler combustion efficiency [3][4][5] and NOx emissions [6 ...

Learn More

Air Flow | E Instruments | e-inst.com

Infiltration air is the outdoor air that is not deliberately in the boiler. Sources of infiltration air maybe cracks or leaks. Dilution Air Dilution air is the air that combines with the flue gases and lowers the oncentration of the emissions. There are two types of dilution air

Learn More

Measurement of Oxygen Concentration in Package Boiler Flue ...

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).

Learn More

boiler flue gas in the form of oxygen

Flue gas carbon dioxide and oxygen - Ian Braithwaite BSc . The total number of units of flue gas is 79 + 8 + 5 = 92. This allows us to work out the percentages of gases as displayed by the flue gas analyser. Carbon dioxide: 100 x 8/92 = 8.7%. Oxygen: 100 x 5/92 = 5.4%.

Learn More

Boiler Emissions 101 - Boiler Service | Boiler Parts

With Flue gas recirculation (FGR) a percentage of the flue gas is reintroduced into the combustion chamber (as part of the combustion air) to cool the core flame temperature to reduce NOx. FGR does require more horsepower to drive larger fans because of both the increase in mass as well as the increased temperature of the combustion air being ...

Learn More

Measurement of Oxygen Concentration in Package Boiler Flue ...

A package boiler operates more efficiently if the oxygen concentration in the flue gas is reduced. 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.

Learn More

Combustion Oxygen Measurement Calls for a | Power Engineering

Aug 01 2004 · Boiler components such as expansion joints turning vanes duct bends soot blowers and internal truss work can cause the flue gas to stratify eddy or draft in ways that can change with boiler

Learn More

Oxygen Control | CleanBoiler.org

Automatic O2 systems continuously monitor the flue gases and adjust the burner air supply. They are generically called O2 Trim Systems. Operation. An electronic sensor is inserted into the boiler flue near the boiler ahead of any dampers or other sources of air leakage into the boiler or flue.

Learn More

What is Flue Gas? - Keison Products

The remaining oxygen not used in combustion in the case of excess air appears as gaseous flue gas and is used to measure combustion efficiency. It is used to determine flue gas loss and carbon dioxide content. Typical values in flue gas: Oil burners: 2% - 5% and Gas burners: 2% - 6%: Kane 455 Infra-Red Analyser. Testo 327-1 Flue Gas Analyser

Learn More

5 Factors Killing Your Industrial Boiler Efficiency & What ...

Dec 02 2016 · 2. Flue Gas Temperature "Stack temperature" or flue gas temperature measures the temperature of the combustion gases when they leave the boiler. If the flue gas temperature is high it suggests the heat created by the boiler isn't being effectively used to generate steam. In other words a high flue gas temperature suggests heat is being lost.

Learn More

Flue gases and combustion product hazards from heating ...

On a recent boiler repair job in Two Harbors MN an initial inspection by a heating technician condemned a heating boiler as unsafe because of elevated CO levels in the boiler's exhaust. He found 101 ppm in his measurement of CO in the flue and pointed to rust on the boiler bottom as the possible cause

Learn More

Technical advice on boiler combustion control

It should be noted that most boilers require higher flue-gas oxygen content at lower loads. This generally results from the fact that mixing is compromised in the burner at low loads. Additionally flue-gas oxygen content targets will be influenced by additional environmental controls such as nitrogen oxide control.

Learn More

Influence of flue gas recirculation on the performance of ...

The oxygen content in the flue gas and FGR have significant influence on NOx emissions. The NOx concentration at outlet of the economizer increases from 209.54 mg/m 3 to 307.30 mg/m 3 that is an increase of 46.65% when the oxygen content at outlet of the economizer increases from 4.52% to 8.00%.

Learn More

Measurement of Oxygen Concentration in Package Boiler Flue ...

A package boiler operates more efficiently if the oxygen concentration in the flue gas is reduced. 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.

Learn More

Boiler Emissions 101 - Boiler Service | Boiler Parts

With Flue gas recirculation (FGR) a percentage of the flue gas is reintroduced into the combustion chamber (as part of the combustion air) to cool the core flame temperature to reduce NOx. FGR does require more horsepower to drive larger fans because of both the increase in mass as well as the increased temperature of the combustion air being ...

Learn More

boiler flue gas in the form of oxygen

Flue gas carbon dioxide and oxygen - Ian Braithwaite BSc . The total number of units of flue gas is 79 + 8 + 5 = 92. This allows us to work out the percentages of gases as displayed by the flue gas analyser. Carbon dioxide: 100 x 8/92 = 8.7%. Oxygen: 100 x 5/92 = 5.4%.

Learn More

Boiler Combustion | CleanBoiler.org

Flue gas recirculation or FGR is the most effective method of reducing NOx emission from industrial boilers with inputs below 100 MMBtu/hr. FGR entails recirculating a portion of relatively cool exhaust gases back into the combustion process in order to lower the

Learn More