Energy, fuels, and chemicals 



3219 



WET 

 FEED- 



DRYER 



WASTE 

 HEAT 



DRY 

 FEED- 



— VAPOR - 



CONDENSER —VAPOR 



BURNER 



CHAR 



PYROLYTIC 

 OIL 



HEAT 



Figure 26-34.— Block flow diagram for the Tech-Air pyrolysis system. (Drawing after 

 Knight and Bowen text footnote^^) 



metals and glass (fig. 26-35). It is presented here because the process will work 

 as well, maybe better, with wood feed. Of course, the glass and metal recovery 

 systems will not be needed. 



This pyrolysis is aimed at producing a maximum yield of combustible liquid 

 or oil. Pyrolysis is carried out on finely shredded organic material which is 

 carried into the reactor by recycled off-gases. Pyrolysis takes place at 950°F at 

 about 1 atmosphere pressure and with short residence time. The charcoal is 

 separated from the product stream by cyclone separators and then combusted in 

 the charcoal burner. The remaining pyrolytic vapors are rapidly quenched to 

 prevent further cracking of the oils. At this point, the products are separated into 

 pyrolytic oil, gas, and water. The pyrolytic oil (10,600 Btu/lb) produced is 

 intended to be sold as a substitute for No. 6 residual (Bunker C) fuel oil. The 

 pyrolysis gases have a heating value of about 380 Btu/sdcf , are recycled for use 

 as a transport medium, and eventually are burned to provide heat to the rotary- 

 kiln dryer. 



OIL 



COLLECTION 



SYSTEM 



GAS 



WATEF 



OIL 



» ALUMINUM 



» FERROUS METAL 



Figure 26-35. — Simplified flow diagram for the Occidental resource recovery system. 

 (Drawing after Preston 1975.) 



