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Posted by daestrom on April 13, 2008, 12:26 pm
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> Too big for homepower but
> I thought somebody here might have something to say
> about this ...
>
> I attend several civic/community meetings per month...
> recently I attended a meeting that outlined the following
> plan to put two Methane Electric Generators at a closed landfill.
> Each generator can produce up to over +1 MwattHours --
> the total facility output of +2 MwattHourss would be
> sold back(via Net Metering) to the local Utility (PEPCO).
You don't really say, but I'm going to *assume* these are diesel-engine
units. I've seen similar units discussed on TV that they can run off the
methane from a landfill.
And you seem to have some units mixed up. They probably are 1 Mwatt units.
That sounds about right for a mid-sized stationary diesel set. But 1
MwattHours wouldn't mean anything unless you can say over how much time it
takes to generate that much energy.
<snip>
>
>
> Current CNG Flare Emissions for 2007 ( Normalized to 810 SCFM)
> TSP =01.85 tons/yr
> SOx =01.69 tons/yr
> NOx =04.53 tons/yr
> CO =80.68 tons/yr
> VOC =00.02 tons/yr
> PM(10) =01.85 tons/yr
>
>
> Proposed CNG Generator Emissions( Normalized to 810 SCFM)
> TSP =05.11 tons/yr
> SOx =01.66 tons/yr
> NOx =19.75 tons/yr
> CO =95.43 tons/yr
> VOC =23.03 tons/yr
> PM(10) =05.11 tons/yr
>
>
> Maryland Dept of Environment (MDE) Standards for
> Significant Source Emissions
> TSP =015.00 tons/yr
> SOx =040.00 tons/yr
> NOx =025.00 tons/yr
> CO =100.00 tons/yr
> VOC =025.00 tons/yr
> PM(10) =015.00 tons/yr
>
>
> The only emission that is approaching the state limits is
> the VOC ( Volatile Organic Compound) level. Electrical,
> Operational (Heat Output) , and emission are monitored
> remotely and controlled via computer. Typical landfill
> VOC gases include benzene ( albeit it could be a
> something else). Nobody was explaining what
> TSP or PM(10) was ...but I recognized Sulfur Oxide,
> Nitrioxide, and Carbon Monoxide in the chart above.
>
I suspect PM(10) is a measure of 'Particulate Matter' (maybe the '10' is the
size of the particles??). Some older diesels have a bad reputation for
creating soot particles and blowing them into the air. Newer ones are much
better though.
>
> Electricity cost have been gradually increasing
> due to deregulation -
Well, they certainly have risen, but I don't know that I'd blame it '...due
to deregulation'.
> Given the following electricity
> rate below - I expect this proposed facility
> will generate about $1,793,000/ year
>
> PEPCO electricity
> generation charge for 1KWH = .1023400 USD
> Energy charge for 1KWH = .0187777 USD
> Transmission charge for 1KWH = .0040200 USD
>
So the obvious question is, "Do they get paid all those for their
'net-metering' or just the generation charge?"
Their income will probably be a bit less than that. I'd be surprised if the
engine could run 24/7 for an entire year without maintenance. So maybe 80%
to 90% of that number.
>
>
> The county will own the generators and pay a private
> contractor to monitor and service the facility.
> The minimum contractor response time to
> reach the facility is 2 hours.
>
> At the Environmental impact public briefing that
> I had attended recently, the local neighboring residents
> who lost their wells to the closed landfill expressed
> a high level of skepticism about how neighborhood
> friendly the proposed facility might be. I asked that
> the project manager look into presenting possible
> noise abatement and emission scrubber options to the
> public.
>
>
> Did I miss anything?
>
> Should I have asked about anything else?
>
Maybe what PM(10) and TSP are... :-)
And as another pointed out, why do some of the emissions go up? I can
understand NOx rising, it's created in just about any internal combustion
engine. SOx stays about the same because it comes from the fuel being used
and that is being released anyway. But CO should go down unless the
engine's not being maintained. Having CO in the fuel supply just means the
air-fuel mixture is a bit different than straight methane. But the engine
gets hot enough to burn CO into CO2. And I too don't understand VOC rising
so dramatically.
daestrom
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