Abstract
A new type of low-NO x burner was studied for application to a regenerative burner system in an industrial furnace. The fuel is separately injected at an angle to the axis of the air stream. As a result, mixing of fuel and air is suppressed at the initial stage of combustion, and combustion progresses gently. Consequently, very uniform combustion is obtained, self-recirculation of the flue gas is achieved, and emission of NO x is considerably reduced, along with a decrease in the quantity of soot produced. The experiments were conducted under the conditions of preheated air temperature of 1100°C and a furnace temperature of 1000–1340°C. NO x emission from the low-NO x burner is under 50 ppm corrected to 11% excess O 2. A regenerative burner system with this new type of low-NO x burner was applied to a heavy forge furnace. It was confirmed that the low NO x burner meets Japanese environmental regulations. The energy saving was 55%.
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