[Gasification] Levelised Energy Cost and electrical efficiency

David Coote dccoote at mira.net
Tue Jun 26 17:29:02 CDT 2012

Thanks for the info, Tom.

The GCV/NCV item is always a fertile source of confusion between various countries. I quote efficiency on NCV. So the efficiency I used for calculating the LEC used NCV which was derived from GCV (dry basis) taking into account moisture content and water from the combustion reaction.

On another topic, any idea how they're getting their heat? Is it off a water jacket on the engine?



Message: 13
Date: Mon, 25 Jun 2012 17:44:02 -0700
From: "Tom Miles"<tmiles at trmiles.com>
To: "'Discussion of biomass pyrolysis and gasification'"
	<gasification at lists.bioenergylists.org>
Subject: Re: [Gasification] Levelised Energy Cost calculation for UBC
	2MWe	gasifier
Content-Type: text/plain; charset="us-ascii"


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


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