Your benefits with our Dual Fluidized Bed Gasifier
Practically nitrogen-free synthesis gas (syngas)
Hydrogen-rich syngas (approximately 40 vol.% H₂)
High heating value (12.5 MJ/Nm³), enabling the use of syngas as a substitute for fossil natural gas in industrial processes
Syngas composition is well suited for downstream synthesis applications
Residual streams generated during syngas cleaning are thermally treated and recovered directly within the plant
No air separation unit (ASU) required, resulting in low operating costs
High cold gas efficiency of >70%
Autothermal process
Proven technology
Key Process Parameters for your Gasification Solution
5–30 MW
1,000–6,200 Nm³/h
approximately 12.5 MJ/Nm³
3.6–21.3 MW
Plant Specifications
The DFB gasification process is an autothermal, steam-blown fluidized-bed gasification technology. DFB stands for Dual Fluidized Bed, referring to a two-reactor fluidized-bed system.
How Does the DFB Gasifier Work?
The gasification section is designed as a bubbling fluidized-bed reactor operated with steam in the absence of air. There the fuel reacts with the hot steam to syngas. The combustion section is a circulating fluidized-bed reactor operated with preheated combustion air. The energy required for the gasification process is supplied by the circulating hot bed material. In the lower section of the gasification reactor, the bed material, together with unconverted char, is conveyed to the combustion reactor via a chute. Combustible residual streams generated during syngas cleaning and processing are also thermally converted there.
The two reactors are gas-tight separated from each other by the chute and upper seal. Resulting in a practically nitrogen-free syngas, a key requirement for efficient downstream synthesis processes.
Typical Syngas Composition from Woody Biomass
We supply the complete DFB gasification plant, from the fuel feed hoppers (lock hopper vessels) through to the outlet of the RME scrubber, as a complete plant (except for civil works). Plant capacities are available for fuel thermal inputs ranging from 5 to 30 MW.
State-of-the-art syngas cleaning systems, including hot gas filtration and a RME (rapeseed methyl ester) scrubber, remove particulate matter and heavy tars from the syngas. In this condition, the syngas can be used directly for thermal applications in industrial processes as a substitute for natural gas.
Following fine gas cleaning using activated carbon adsorbers and zinc oxide (ZnO) filters, the syngas achieves a quality ideally suited for downstream synthesis processes, such as the production of hydrogen, methanol, synthetic natural gas (SNG), and Fischer-Tropsch products. The syngas mainly consist of CO, CO2, H2, H2O und CH4.
Areas of application for gasification solutions
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Substitute for natural gas in industrial processes
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Fischer-Tropsch synthesis plants (green fuel, synthetic crude oil, waxes)
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Synthetic Natural Gas (SNG) production plants (methanation)
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Hydrogen production plants (green hydrogen, H₂)
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Methanol synthesis plants
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Dimethyl Ether (DME) production plants
