Aug 01, 2004 · There are many causes for an erroneous oxygen measurement. Calibration system leaks or malfunctions, poor system grounding, or even moisture in the measurement cell reference air affect boiler
Because boilers don't always operate at 3% oxygen, it is necessary to convert ppm values measured at various excess air levels to 3% oxygen for comparison and regulation compliance purposes. To correct emission levels to 3% oxygen that are referenced to excess air levels …
Why Oxygen Levels Matter in High Efficiency Boilers
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.
Galvanic corrosion. Caustic corrosion. Acidic corrosion. Hydrogen embrittlement. Oxygen attack. Carbon dioxide attack. Without proper mechanical and chemical deaeration, oxygen in the feed water enters the boiler. Much is flashed off with the steam; the remainder can attack boiler metal.
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.
a high residual of an oxygen scavenger would consume all dissolved oxygen. In reality, competing chemical reactions between oxygen and boiler surfaces are more likely to occur, resulting in significant corrosion within the system. Consequently, maintaining high scavenger levels may not provide adequate protection. Routine