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Fuel is introduced onto the inner running surface of a highly polished fast spinning cup (3 to 7000 rpm). Under centrifugal force this fuel forms a thin film. Due to the conical shape of the cup the fuel flows to the outer edge spilling into the primary atomizing air stream. The fuel is broken into small droplets and mixed with the primary air supplied by the shaft mounted fan. Secondary air is supplied by an external fan for larger units. Packaged units of this design have the air flow valve controlled by the fuel supply pressure to the distribution manifold. The spinning cup offers the following advantages: 1) Wider turn down ratio with lower excess air; 2) Low O2 levels; 3) No requirement for atomizing air or steam; 4) Low fuel pressure requirements to an extent that gravity flow is sufficient stable flames achievable with very low fuel flows although maximum flow limited by size of cup. This, allied to being limited to side firing making the design more suitable for smaller installations.

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