David,
They offset high priced gas plus a CO2 tax of about CAN$2.75/GJ (?) so the products are electricity, heat (~12-20% of campus demand), and CO2 tax offset. It is really a heating plant with a 2 MWe generator. If the plant electrically efficiency is based on GCV then 24% is probably too high. It's usually in the 14-17% range. >From their published profile: Electricity Production 15,300,000 kWh/yr Annual Gas Displacement 86,000 MMBtu/yr (from 9,600 pph steam [now increased to 20,000 pph]). Avoided CO2 Emissions 4,500 tonnes yr Avoided CO2 Emissions (Car Equivalent) 1,100 cars/yr Wood Fuel Required 12,500 bone dry tonnes/yr Tom From: [email protected] [mailto:[email protected]] On Behalf Of David Coote Sent: Monday, June 25, 2012 5:01 PM To: [email protected] Subject: [Gasification] Levelised Energy Cost calculation for UBC 2MWe gasifier I ran my Levelised Energy Cost Model ($/MWH) for the 2MWe electricity supply over 20 years for a range of turnkey and fuel costs on the plant using the following assumptions (I used 24% for electrical efficiency for comparison with a 5MWe SRC system): Annual operations (hours) 7,500 Annual O&M as % of initial investment 10.0% Discount rate 5.0% Plant electrical efficiency 24.0% Fuel Moisture content 47.0% GCV (MJ/kg) 19.0 Plant cost Fuel cost/tonne $0.0 $10.0 $20.0 $30.0 $40.0 $50.0 $16,000,000 $188.18 $206.42 $224.65 $242.88 $261.12 $279.35 $17,000,000 $199.94 $218.18 $236.41 $254.64 $272.88 $291.11 $18,000,000 $211.71 $229.94 $248.17 $266.40 $284.64 $302.87 $19,000,000 $223.47 $241.70 $259.93 $278.17 $296.40 $314.63 $20,000,000 $235.23 $253.46 $271.69 $289.93 $308.16 $326.39 $21,000,000 $246.99 $265.22 $283.46 $301.69 $319.92 $338.16 this is without the revenue from heat sales which would bring the levelised cost down a bit depending on what they can sell the steam for and for how many hours a year. If they're using the steam for chillers as well as space heating this would help bump up steam revenue. Based on some European data, heat capacity factors might be as low as 15-20%. It would be interesting to know the UBC campus electricity load profile. If the baseload is less than 2MWe they will either have to turndown (less hours to amortise the supply over which pushes up the price/kWh) or sell into the Canadian grid at a heavy loss. The numbers look a lot better as the installed price/kWe comes down. There probably wouldn't be large learning curve savings on the engines so the potential drop is in the gasifier price as more get built. The other potential drop is in the annual O&M. This should come down as the gasifiers improve Cheers David
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