Combustion Flue Gas Analysis Reduces NOx and Slag

Combustion flue gas analysis is used by power plants to optimize fuel/air ratio. By measuring the amount of excess oxygen and/or CO in the flue gases resulting from combustion, plants can operate at the best heat-rate efficiency and lowest NOX, and generate the least amount of greenhouse gas. The theoretical ideal, or the stoichiometric point, is where all fuel reacts with available oxygen in the combustion air, and no fuel or O2 is left over.

In actual practice a perfect mix of fuel and air may not be achievable, operation with 1-3% excess O2 and low parts per million of CO may result in the max achievable heat rate.

In addition to achieving the best combustion efficiency, many plants also have other important goals that effective combustion analysis helps to accomplish: minimizing NOX emissions and reducing slag.

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