March 8-13, 2009
The production of Substitute Natural Gas from biomass (Bio-SNG) is an attractive option to reduce CO2 emissions and replace declining fossil natural gas reserves. The Energy research Center of the Netherlands (ECN) is working on the development of a technology to convert a wide range of fuels into Bio-SNG. The ECN Bio-SNG technology is based on indirect gasification of biomass. The MILENA indirect gasifier is developed to produce a gas, which can be upgraded into SNG with a high efficiency. Because of the indirect heating of the gasification process no oxygen is required. Char and tar are removed form the producer gas and are used as fuel to produce the required heat for the gasification process. The OLGA tar removal technology is used to remove tar and dust from the gas. After gas cleaning the gas is catalytically converted into a mixture of CH4, CO2 and H2O. After compression and removal of CO2 and H2O, the remaining methane can be used as Bio-SNG. ECN produced the first Bio-SNG in 2004, using a conventional fluidized bed gasifier. The lab-scale MILENA gasifier was built in 2004. The installation is capable of producing approximately 8 mn3/h methane-rich medium calorific gas with high efficiency. The lab-scale installation has been in operation for more than 1000 hours now and is working fine. Several biomass fuels were tested. Woody biomass appears to be the most suited fuel. The lab-scale gasifier is coupled to lab-scale gas cleaning installations (including OLGA) and a methanation unit. The integrated system was tested several times. ECN has recently finished the construction of an 800 kWth pilot-scale gasifier which was taken into operation in the summer of 2008. First results, using wood as a fuel, show that the gas composition is similar to gas from the lab-scale installation. The pilot scale gasifier will be coupled to the existing pilot scale OLGA gas cleaning unit. ECN aims to demonstrate a 10 MWth SNG production plant, based on the ECN MILENA and OLGA technology in the near future. The scale foreseen for a commercial single-train Bio-SNG production facility is between 50 and 500 MWth. The expected net overall efficiency from wood to Bio-SNG is 70%. Visit www.BioSNG.com, www.Olgatechnology.com or www.Milenatechnology.com for more information. During the conference an overview will be given of the latest results from the lab-scale methanation experiments, the first results from the 800 kWth MILENA pilot plant and the plans for the near future.
Christiaan M. van der Meijden and Berend Vreugdenhil, "SCALE-UP OF THE MILENA GASIFICATION PROCESS FOR THE PRODUCTION OF BIO-SNG" in "Bioenergy - II: Fuels and Chemicals from Renewable Resources", Dr. Cedric Briens, ICFAR, University of Western Ontario, Canada; Dr. Franco Berruti, ICFAR, University of Western Ontario, Canada; Dr. Muthanna Al-Dahhan, Washington University, USA Eds, ECI Symposium Series, (2009). http://dc.engconfintl.org/bioenergy_ii/29