fuel boiler excess air coefficient

Excess Air Coefficient - an overview | ScienceDirect Topics

The excess air coefficient is one of the important factors affecting the fuel type oxides generated. Bed temperature of the CFB has a certain influence on the formation type fuel NO, especially under the low-NO x index, the producing rate must attach importance to it. In addition, coal and fuel particle properties will have an effect on fuel type oxides generated.

Get A Quote

Reduction of fuel consumption and pollutants emissions in

The amount of air more than the theoretical requirement is referred to as excess air. Power plant boilers normally run about 10 to 20 percent excess air. Natural gas-fired boilers may run as low as 5 percent excess air. Pulverized coal-fired boilers may run with 20 percent excess air. Gas turbines runs very lean with up to 300 percent excess air. Typical values of excess air for some commonly used fuels are …

Get A Quote

Combustion Efficiency and Excess Air

Typical excess air to achieve the highest possible efficiency for some common fuels: 5 - 10% for natural gas. 5 - 20% for fuel oil. 15 - 60% for coal. Carbon dioxide - CO2 - is a combustion product and the content of CO2 in a flue gas is an important indication of the combustion efficiency.

Get A Quote

What is the Air Fuel Ratio Effect on Combustion Efficiency?

Nov 21, 2017 · In those cases, the industry norm is an excess air level of 8 – 10%. Combustion of liquid fuels, on the other hand, requires excess air levels of 20 – 25% to prevent soot formation. By the way, the operator of the furnace typically only knows the firebox oxygen level.

Get A Quote

Optimal Combustion Process - Fuels and Excess Air

Excess Air Coefficient - an overview | ScienceDirect Topics

Get A Quote

(PDF) A CASE STUDY FOR CALCULATION OF BOILER EFFICIENCY …

excess air to reduce boiler efficiency. Research has shown that 15% excess air is the optimal amount of excess air to introduce into the boiler combustion process. While some boilers have been able to achieve 15% excess air at the top end of a boiler's firing range, the challenge presents itself at …

Get A Quote

Methane fuel is burned with air in a boiler system

Mar 15, 2019 · 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-air calculation would be: 0.895 x 0.025 / (0.21-0.025) = 12.1% excess air. Too much excess air leads to lower flame temperature. That means less heat gets into the system. Also, excess air must heat up to flue gas temperature, which …

Get A Quote