ANDRITZ Carbona Bubbling Fluidized Bed (BFB) gasifier
Pressurized systems, air- or oxygen-blown
ANDRITZ Carbona pressurized gasification technology was originally developed for coal gasification by the Gas Technology Institute in the USA. Since this early development, ANDRITZ has modified the technology for biomass use.
ANDRITZ BFB gasifier system
ANDRITZ has developed air-blown and oxygen-blown BFB gasifiers using two large pilot plants. In addition, a commercial gasification plant in Denmark has logged significant operating hours to develop the gasifier and gas clean-up system. The gas clean-up is particularly important for removing the most harmful elements, either by filtering the partially cooled gas or by using reactive catalysts in order to avoid tar problems. Catalysts are also utilized for changing gas composition, depending on the application.
The main application for pressurized air-blown BFB gasification would be to fuel a Combined and Heat Power (CHP) plant with gas engines like the one in Skive, Denmark.
Low-pressure system for combined heat and power applications
In low-pressure (air-blown) systems, the ANDRITZ Carbona gasification plant can provide clean gas for engines or boilers. Typically, these applications are in the 20 – 50 MWfuel range.
The first demonstration plant in a Combined Heat and Power (CHP) application was commissioned in Skive, Denmark, in 2008. The gas product from the BFB gasification plant fuels three gas engines. The main components of the Skive installation are the fluidized bed ANDRITZ Carbona gasifier in connection with a catalytic gas clean-up system and the engine power plant with heat recovery.
The system is best suited for power generation of 5 – 15 MWe. The electrical energy efficiency of the process is around 30% and the total energy efficiency of the plant is higher when used in CHP mode.
BFB gasifier. I/S Skive Fjernvarme, Denmark.
| Fuels | Wood pellets and chips |
| Technical data | 6 MWe and 12 MW (41 MMBtu/hr) district heat Low-pressure BFB Gasifier Three combustion engines Option: gas combustion in two district heating boilers |
| Features | Unique catalytic tar reforming system Large turndown ratio Entire plant CE-approved |
