MILENA-OLGA - Biomass Gasification Technology
From Renewable Energy Gasification & Gas Purification
Numerous countries have set obligations to reduce the CO2 emissions from industrial furnaces and boilers. One way to do so is by replacing the furnace fuel with cleaned product gas from biomass and waste gasification. This indirect co-firing requires an additional installation that converts the solid biomass into a gas, but has the advantage that it can handle a wide range of cheap biomass and waste fuels. Most of the biomass ash components are separated from the gas before it enters the boiler. Separation of biomass ash can prevent fouling issues in the boiler.
Product Details
Indirect co-firing, using biomass gasification technology, is already common practice. In Geertruidenberg (Nl), a 80 MWth Lurgi CFB gasifier produces gas from demolition wood which is co-fired in a pulverized coal boiler. In Ruien (Be), a 50 MWth FW fluidized bed gasifier is in operation. These gasifiers are both direct gasifiers, which limit the fuel flexibility as lowering operating temperatures, as necessary for specific feedstocks, will immediately result in poor conversion and ashes with high carbon content.
Indirect co-firing, using indirect MILENA gasification technology, brings an additional degree of freedom. In indirect systems, non-converted carbon from the gasification process is combusted in a separate reactor zone, providing the heat needed for the endothermic gasification reactions. This allows for lower operating temperatures when using feedstocks with high alkali content, whilst maintaining the full carbon conversion of an indirect gasifier.
The product gas can be utilized in the industrial furnace and boilers, whereas heat from the flue gas can also be recovered. The ratio between the energy in the product gas (chemical and thermal) and the flue gas (thermal) is dependent upon operating conditions, the conversion is not and is always 100%.
The technology allows for efficient utilization of woody biomass fuels, as well as more complicated waste and herbaceous fuels. Removal of tars, including dioxins upstream the industrial furnace and boilers, via the proprietary OLGA technology will be required though can be less extended in comparison to turbine or engine applications.
Ammonia and sulphur removal can be implemented either upstream the boiler (pre-combustion) or downstream the boiler, depending on the (existing) boiler configuration.
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