RADIANT OVEN COIL FOR ETHYLENE CRACKING Russian patent published in 2017 - IPC C10G9/20 

FIELD: machine engineering.

SUBSTANCE: coil comprises a first intake pipe, the second pipe, third pipe and the fourth exhaust pipe, which are connected in series by the movement of the input stream of the gas mixture through outlets, the first inlet pipe is U-shaped form of two round pipes of smaller diameter than the transverse sections of second, third and fourth tubes. Wherein the second, third and fourth tubes are made in transverse section with contour profiled inner surface in the shape of helix with a ratio of small and large axes helicoid equal 0.4-0.79 and a smooth inner projection on the geometrical surface of the second order with the narrow end helix, with smooth internal projection depending on the composition of the starting raw material of the pyrolysis and the desired level of selectivity of the process is twisted spirally around the vertical axis in steps of 1.5-2.6 of the length of the major axis of the helix, the inner spin smooth protrusion formed in the opposite direction with respect to the rotational direction of the vortex in themselves helicoid channels formed inside pipes helicoid surface, the fourth exhaust pipe is provided with a transverse section, which is bigger than the transverse section of the third pipe, the transverse section of which is bigger than the second pipe has, at the same time the transverse section of the second pipe is bigger than the transverse section first intake pipe.

EFFECT: proposed design allows the coil to reduce the coking process the inner surface of the coil tubing and increase the selectivity of the process of obtaining high-condensate pyrolysis gas.

2 dwg, 1 tbl