Capturing waste heat from diesel engine....
Capturing waste heat from diesel engine....
(OP)
I'm looking to capture waste heat to generate electricity. my first idea was to use a centrifugal supercharger but in effect use it in reverse, by changing out the compressor blade for a turbine blade and using the pulley to drive a generator.
One of my concerns is that the centrifugal supercharger will not be able to deal with the heat, and break down very quickly.
Another concern is that the geometry inside of the supercharger won't allow for proper flow.
I have tried doing research to see if something like this has already been done, but so far i haven't been able to find anything. If you have ny knowledge it will be extremely helpful. thank you very much
One of my concerns is that the centrifugal supercharger will not be able to deal with the heat, and break down very quickly.
Another concern is that the geometry inside of the supercharger won't allow for proper flow.
I have tried doing research to see if something like this has already been done, but so far i haven't been able to find anything. If you have ny knowledge it will be extremely helpful. thank you very much





RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
I've run some quick numbers based on a lean burn 32:1 AFR natural gas engine (cause I have the data).
The recoverable power (without condensing the water in the exhaust, which leads to other issues) coming out the exhaust is about 9 kW (12 hp). Based on a natural gas delivery rate of $6/GJ (current wholesale is ~$4/GJ) your cost savings is about $4 or $5 per day, meaning it would take you ~2 years to payback the centrifugal supercharger (if it works). Or you could save about $18 per day in electricity.
Running some quick numbers can save you from some really good bad ideas.
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
You could try to use the turbine half of a turbocharger to drive a generator. The turbine side is different aerodynamically than a compressor side (such as in a centrifugal) You would have to carefully match the turbine to the engine and your generator choice though. If the engine is turbocharged already there's going to be less available energy to drive a second turbine. You'll also have to pay attention to the turbo bearing type/loading and the speed at which you're driving your generator.
RE: Capturing waste heat from diesel engine....
http://www.gizmag.com/go/4936/
I haven't seen anything on it recently.
RE: Capturing waste heat from diesel engine....
I've never stripped down a turbo, but would it really be as easy as just pulling it apart to get an exposed shaft to put on a pulley?
RE: Capturing waste heat from diesel engine....
Bearings are going to be an issue with this. Turbo bearings likely won't handle the radial load that a pulley or gearset will place on the shaft. Balancing your assembly is also going to be critical and I don't think a belt will handle the speeds. You could see how it's done on a centrifugal supercharger though, maybe use the gearing and bearings from one of those and adapt it to fit the turbine.
RE: Capturing waste heat from diesel engine....
so i guess i need to research steam generation more using diesel exhaust to turn at a lower speed.
RE: Capturing waste heat from diesel engine....
That's why cogeneration typically uses only the waste heat.
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RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
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RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
RE: Capturing waste heat from diesel engine....
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