OCR Text |
Show inlet, recuperator with exhaust outlet. A central pipe for fuel delivery into the mixing zone is fixed by one end in the rear cover of the burner and supplied by the nozzle on the opposite end, which is inserted into the inner firing tube. An outer radiant tube covers the inner firing tube and is fixed on the burner's mounting flange. with a burner and recuperator coaxially mounted inside of a radiant tube, the SER internally transfers waste exhaust heat to the burner's air supply, providing pre-heat temperatures up to 6000 C (11000 F). Natural gas and propane nozzles have been available for some time. Eclipse Combustion, Inc. developed butane nozzles, to fit into the same enclosures as the natural gas and propane nozzles. The rapid mixing feature is the main idea of butane nozzle design, this ensures more intensive introduction of Butane vapor into the air stream. 'U' TUBES Eclipse Combustion, Inc. u-type radiant tube burners (63-TFB's) (Fig.4), consist of a cast body with gas and air inlet, and fuel lance which supplies the gas to the burner nozzle. The nozzle is installed inside of an alloy air tube with the adjustable circular gap. Gas-Air mixing is organized by three stages of air delivery to the flame core. As shown in Fig.4, the first stage air introduces into the nozzle cone, second stage air pushes around the nozzle through the gap, and third stage air is organized as a circular stream, formed between the radiant and air tubes. To form that stream, four holes are made in the base of the air tube. It was discovered in experiments that the same natural gas nozzle was perfect for operation on propane or butane vapor, with only an adjustment of the circular gap and air tube holes necessary. -6- |