초록 ▼

A low NOx burner combustion system which may be adjusted for optimum burn rates, temperature and oxygen levels. The burner incorporates a plurality of gas nozzles which individually inspirate a portion of the combustion air and a spin vane diffuser to rotate and mix the gases within the primary comb

A low NOx burner combustion system which may be adjusted for optimum burn rates, temperature and oxygen levels. The burner incorporates a plurality of gas nozzles which individually inspirate a portion of the combustion air and a spin vane diffuser to rotate and mix the gases within the primary combustion zone. The diffuser is axially adjustable in order to vary the distance between the vane and the first combustion zone while the blades of the diffuser can be angularly adjusted to optimize the rotation and mix of the gases. Air for combustion is supplied through primary, secondary and tertiary passages to create distinct combustion zones for complete combustion. The flow rate of the combustion air is controlled through a damper in accordance with the burn characteristics. The angular and axial position of the diffuser and the damper control of combustion air can be automatically adjusted throughout the firing range of the burner in response to demand levels. In order to convert existing burners to the efficient low NOx burner of the present invention the primary air chamber may be retrofit into the main burner chamber. In a further embodiment, flue gas is recirculated and mixed directly with combustion fuel prior to combustion for reduced emission levels.

대표청구항 ▼

In a burner adapted to reduce emission of NOx gases upon combustion of a fuel and air, the burner including a source of combustion air and a source of combustion fuel, at least a portion of the combustion air flowing through a central air passage into which the combustion gas is supplied for combust

In a burner adapted to reduce emission of NOx gases upon combustion of a fuel and air, the burner including a source of combustion air and a source of combustion fuel, at least a portion of the combustion air flowing through a central air passage into which the combustion gas is supplied for combustion in a primary combustion zone, the improvement comprising: a plurality of eductor nozzles radially spaced about the central air passage for supplying combustion fuel to the central air passage, said eductor nozzles mixing secondary combustion air with combustion fuel prior to flow into said primary combustion zone; a vane diffuser positioned within the central air passage for imparting a mix rotation on the combustion air flowing through the central air passage thereby optimizing mix of combustion gas and combustion air for combustion in the burner; and means for controlling the volume of flow of combustion air into the central air passage for optimum combustion and reduction of NOx emissions.