Burnout Gas Re-circulating System

   The burnout gas is drawn from the furnace.  It is injected into the primary combustion gas after cooling at the heat exchanger.  This promotes mixing of the primary combustion gas. The oxygen in the burnout gas is used effectively for the combustion.   As a result, this system reduces the secondary air volume needed for a complete combustion.

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This graphic chart shows the operating data of the demonstration in percentages compared with the regular operation (at the total excess-air ratio of 1.7~2.0).

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