Hello Ken,
A rough calculation shows the opportunity to get ~150 kW output power, using a
Kaplan or propellor turbine.
However, the discharge of a waste water plant is not always that clean as you
would like to believe. Those tiny suspension particles will make the turbine to
clogg randomly, so it has to be cleaned quite often in comparison with clean
water turbines. There is also higher errosion due to small metal and sand
particles. This means higher general maitenance costs. One simple idea is to
reverse the turbine speed once a day, using a softstarter for instance. The
water turbulence would contribute to rotor cleaning, so you will have to seldom
dismantle and clean it manually.
Since you say the flow is constant, you could use a constant speed induction
generator, and a fixed pitch rotor. Things with moving blades will have higher
chances to get gripped by the muddy water. Please choose carefully the rotor
characteristics.
It's a feasible idea after all. There are experienced guys in the group who
could put you on the track for a good propellor supplier. The first name which
crosses my mind right now is Peter Ruyter, www.cargo-kraft.se
BR,
Radu
----- Forwarded message from Ken Carman <[EMAIL PROTECTED]> -----
Date: Wed, 16 Feb 2005 16:48:21 -0800 (PST)
From: Ken Carman <[EMAIL PROTECTED]>
Reply-To: Ken Carman <[EMAIL PROTECTED]>
Subject: waste water discharge . . .
To: [EMAIL PROTECTED]
Our city has a large water treatment facility with a discharge that has a head
of 6 to 8 feet and a constant year-round flow of nearly 40,000 gpm. Is this a
good opportunity to persue putting a turbine on or not?
Ken [EMAIL PROTECTED]
----- End forwarded message -----
[Non-text portions of this message have been removed]
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