The burner is the true driver of fuel use and costs in a boiler. Over time, linkage joints, cams, and other moving parts wear out, and a burner loses its ability to keep tight control of fuel/air ratio. Additionally, a burner can suffer from plugged or deteriorated nozzles and gas orifices, deterioration of other combustion-head components responsible for proper fuel and air mixing, and a host of other issues. All of this results in unburned fuel and higher-than-required excess-air levels, leading to poor performance, reduction in overall efficiency, and higher operating costs....
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