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nature : in the sand furnace pyrolysis. Heat sand for a heat carrier, into a mist spray (or steam-like) materials and the heated sand pyrolysis reactor in contact with and cracking. Pyrolysis gas entrainment by the cyclone, the sand removed, after water quenching sent separation Section treatment. The whereabouts of the catheter from the sand, fuel and air are heated and put to use again, while attached to the surface of the sand has been burned to Coke. Advantages are : (1) Application of a wide range of pyrolysis can be used to gaseous hydrocarbons, light oil, heavy oil and oil; (2) Available refractory lining is basically only need to ordinary steel, alloy heated to not just build; (3), olefins, aromatics yield higher and with with the adjustment of ethylene / propylene ratio of flexibility; (4) As gas and solid direct contact heat conduction tube furnace than good, it was a small amount of water vapor; (5) continuous mass production. Weaknesses : (1) Major equipment largest higher; (2) operation is more complicated, for a large number of sand endless cycle is very troublesome thing; (3) As between sand and intramural and for the friction loss greater need to constantly fill disposable filling. Olefin Cracking gas at high concentrations, and easy to separate.
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