ECN publication
Waste wood gasification in an allothermal gasifier
Published by: Publication date:
ECN Biomass, Coal and Environmental Research 20-7-2011
ECN report number: Document type:
ECN-M--11-078 Conference Paper
Number of pages: Full text:
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The Energy research Centre of the Netherlands (ECN) has developed a biomass gasification technology, called the MILENA technology. The MILENA gasification technology has a high cold gas efficiency and high methane yield, making it very suitable for gas engine or gas turbine application and upgrading of the gas into Substitute Natural Gas (SNG). HVC Group (situated in Alkmaar, North Holland) is a modern public service waste and energy company. HVC converts waste streams which cannot be recycled into usable forms of energy. HVC has a large waste wood boiler in operation, which produces heat and electricity. HVC expects an important role for Bio-SNG and medium size Bio-CHP plants in the future. HVC has decided to join ECN with the development, demonstration and implementation of the MILENA technology for CHP and SNG production. Most biomass gasification processes use clean wood as fuel, but clean wood is relatively expensive. Waste wood is an attractive fuel for gasification, because it is widely available and the price is low. Because of the pollutants in the wood (glass, nails, screws, plastic, stones, etc.) and the increased content of chloride and sulphur, this fuel behaves differently than clean wood. ECN performed an extensive test program in the 800 kWth pilot scale MILENA gasifier to test if waste wood supplied by HVC is a suitable fuel for the 12 MWth demonstration plant HVC and ECN are preparing. The OLGA pilot plant was used to remove tar and dust from the producer gas. Demolition wood containing painted wood, particle board, glass particles and other pollutants were tested during a duration tests. The test results showed that demolition wood can be a suitable fuel if the bottom ash handling system is designed to discharge the accumulated pollutants like nails and screws and the bed material is refreshed enough to prevent bed agglomeration by e.g. melting glass particles. The gas cleaning should be designed in such a way that the increased level of pollutants (NH3, HCN, H2S, COS and HCl) can be removed.

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