[Gasification] Levelised Energy Cost and electrical efficiency

Tom Miles tmiles at trmiles.com
Tue Jun 26 18:03:15 CDT 2012


Thanks or the clarification. The jacket heat is used for drying the fuel.
Part of the engine exhaust heat is fed to the boiler along with producer
gas. So you have a producer gas fired boiler that is augmented with
recovered heat from the engine exhaust. 


-----Original Message-----
From: gasification-bounces at lists.bioenergylists.org
[mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of David
Sent: Tuesday, June 26, 2012 3:29 PM
To: gasification at lists.bioenergylists.org
Subject: [Gasification] Levelised Energy Cost and electrical efficiency

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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