The boiler combustion efficiency increases to 83.1% (E2). Assuming a fuel cost of $8.00/MMBtu, the annual savings are: Annual Savings = Fuel Consumption x (1–E1/E2) x Fuel Cost = 29,482 MMBtu/yr x $8.00/MMBtu = $235,856 Flue Gas Analyzers The percentage of oxygen in the flue gas can be measured by inexpensive gas-absorbing test kits.
Example - Oil Combustion and Heat Loss in the Flue Gas. If. the temperature difference between the flue gas leaving a boiler and the ambient supply temperature is 300 o C, and; the carbon dioxide measured in the flue gas is 10% - then, from the diagram above. the flue gas loss can …
Limiting the amount of excess air entering a flame is accomplished through burner design and can be optimized through the use of oxygen trim controls. Low excess air firing can be used on most boilers and generally results in overall NOx reductions of 5-10% when firing natural gas. Low Nitrogen Fuel Oil
The boiler efficiency is usually reduced to 84-85%, when a coal fired boiler is converted to natural gas. The biggest change is due to the combustion of Hydrogen. This is normally a 4% heat loss while firing coal and about a 11% heat loss while firing natural gas.
At least 2% oxygen should be maintained, however the oxygen level should not be higher than 4%. 6 Every 1% decrease in the oxygen level in the stack gas means a 0.5% increase in boiler efficiency. 6 In the case of an increase in air, the stack gas is diluted and CO2 concentration decreases while the oxygen concentration increases.
Natural Gas Fired Boilers - innovativecombustion.com
Copper Fittings - 45 Degree Elbows. Bronze Hex Bushings Lead Free. Copper Couplings. Copper Adapters. Boiler Drain Valve & Hose Bibs. Cast Threaded Tees. Sioux Chief 3/4 Inch Pex Fittings. Sioux Chief 1/2 Inch Pex Fittings. Pressure Test Kits.