ECN publication
Indirect gasification of waste to create a more valuable gas
Published by: Publication date:
ECN Biomass & Energy Efficiency 28-6-2016
ECN report number: Document type:
ECN-M--16-051 Conference Paper
Number of pages: Full text:
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Gasification is a thermochemical process which converts solid fuels into a gas with a useful heating value that can be further processed into a variety of products (heat, power, fuels and chemicals), thus creating smart market opportunities for the valorization of low-value solid feedstock. The feedstock composition and the gasification technology/conditions determine the quality of the resulting producer gas (composition, heating value, content and composition of tars and content of other contaminants). The properties of the producer gas together with the final application of the gas determine in turn the design of the gas cleaning section. The Energy research Centre of the Netherlands (ECN) has been working in the last years on the development of technologies for the efficient conversion of biomass and waste into heat, power, fuels and chemicals. Some of the outcomes of this extensive work include the MILENA indirect gasification process, the OLGA tar removal system and the ESME system for production of SNG from biomass gasification. Royal Dahlman is currently marketing the MILENA and OLGA technologies worldwide. As part of the work for development and commercialization of the MILENA and OLGA technologies at industrial scale, this paper reports and compiles results of gasification tests performed at pilot scale (800 kW , HHV)on an initial design MILENA gasifier, with different types of feedstock: biomass (wood) and waste (industrial waste, plastic-rich waste). The results from the most recent measurement campaign carried out at the pilot MILENA/OLGA using shredded Icopower® waste pellets as feedstock are described in detail. The results show that the use of biomass or waste as gasification feedstock lead to differences in the quality of the resulting producer gas, and thus to different considerations on the possibilities for final application and gas cleaning/upgrading of the resulting gas. It can be concluded that gasification of plastic containing waste produces a high calorific value gas, which is particularly suitable for heat and power generation, synthesis and harvesting of valuable coproducts from producer gas. Due to possible high temperature corrosion in boiler applications, fouling of gas coolers due to salts and agglomeration of bed material, the design and operating conditions of an industrial MILENA gasifier have been modified from the initial pilot design.

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