FGR burner flue gas recirculation position
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Today, FGR technology is used in gas boilers to achieve ultra-low nitrogen emissions. There are two approaches, each with its own merits: 1. Some burner manufacturers believe that the temperature at the flue gas recirculation point should be higher, so that less condensation water forms inside the burner； 2. Some burner manufacturers believe that a lower temperature of the return flue gas yields better results, as some of the condensation water in the low-temperature flue gas has already condensed, which means there will be less condensation water inside the burner as well. Theoretical analyses all make sense. I wonder if any of you practitioners have conducted research or experiments in this area; please share your experiences!
What size is the boiler, and how large can the difference between the high and low points be?