3510 



Chapter 28 



RAW MATERIAL 

 FEED 



ROTARY 

 AIR-LOCK ^^^ FUEL 



GAS OUT 



/ 



p 



DRYING 

 ZONE 



DISTILLATION 

 ZONE 



REDUCTION 

 ZONE 



COMBUSTION 

 ZONE 



ASH SCREW 



V 



WOOD CHIP DELIVERY 



LOADNG CONVEYOR 



UVE BOTTOM HOPPER 



EXISTING 19.000 LB/HR 

 QAS/OL PACKAGE BOILER 



LOW BTU 

 GAS PIPE 



^ 



25 MILLION 



BTU/HR 

 GASFER 



WOOD STORAGE 

 (35 DAYS) 



RECLAIM 

 CONVEYOR 



LOW BTU 

 BURNER 



WWWWWWSW 



^ 



COMBUSTION 

 AIR SUPPLY 



Figure 28-7. — Updraft gasifier (top) and overall system (bottom) retrofitted to an exist- 

 ing boiler at the Northwest Regional Hospital, Rome, Georgia. (Drawings after Bul- 

 pitt et al. 1981.) 



