Low NOx Combustion System for Mobile Grate Pelletizers

Abstract

The above mentioned invention describes a method for combustion of gaseous or liquid fuel using a burner assembly (1). Therein fuel, cold primary air and preheated air are supplied to a pre-chamber (2), whereby the fuel and cold primary air being supplied through at least one fuel feed (4) and at least one primary air feed (5), and preheated combustion air is supplied to a combustion chamber (3). The preheated air and / or the cold primary air are injected parallel to the fuel into the pre-chamber (2).

Description

technical field [0001] The present invention relates to a method of burning a gaseous fuel or a liquid fuel using a burner assembly, supplying fuel, cold primary air and preheated air to an antechamber, wherein the fuel is supplied by at least one fuel supply and at least one primary air supply and Primary air, which supplies preheated combustion air to the combustion chamber. The invention also relates to burner assemblies for burning gaseous or liquid fuels to heat industrial furnaces. Background technique [0002] Standard burners are often used in burner assemblies such as curing ovens for mobile grate pelletizing equipment. Commonly used burners stabilize the flame just at the burner nozzle end. Due to the high combustion air temperature, typically up to 1000°C, the flame inside the combustion chamber is very hot. Such hot flames with peak temperatures typically as high as 2000° C. lead to very high nitrogen oxide emissions and may also lead to thermal damage at the ...

AI Technical Summary

Problems solved by technology

As a result, the main problem with standard burners and combustion methods is that the high flame temperature caused by igniting the undiluted fuel results in a hot flame in the combustion zone with a peak temperature greater than 1500°C

However, the volume of cold primary air needs to be increased and further reductions in total NOx formation and capital and operating costs are also desired

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