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Turbine Number Eight | 8 comments (8 topical, editorial)
Re: Turbine Number Eight (3.00 / 0) (#5)
by WXYZCIENCE on Thu Feb 21st, 2008 at 09:59:53 AM MST
(User Info)

Hannu, I constructed a tube boiler last year that is fired by wood or coal. My best guess at the output power is around 200,000 btus. Most steam boilers have to have a good hot fire to produce steady steam. I expect around 10% efficiency in the turbine stage and the co-generation into my green house will use up most of the heat. Progress should speed up now that the hard work is complete. I will post pictures and info as soon as it is working. Thanks for your interest.
Joseph

[ Parent ]


Re: Turbine Number Eight (3.00 / 0) (#6)
by JW on Thu Feb 21st, 2008 at 04:05:15 PM MST
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I just want to chime-in on something, that I feel is very relevant.

 Almost all, small-scale flash-steam power-plants, feature such a short- return-path with the condencer-scheme employ'd, that most such systems, 'do-not' feature a blow-down circuit, within the boiler circuit/cycle.

 In fact, most such small scale systems, are filled with purified-distilled water to begin with. So, there are no dissolved solids to 'blowdown' if you will.

 In general, 'impinging' of the blading, is minimized thru working fluids that have no dissolved solids when condenced, or in the 'semi-state', between vapor and liquid.

JW

[ Parent ]



Re: Turbine Number Eight (3.00 / 0) (#7)
by joestue on Thu Feb 21st, 2008 at 04:44:15 PM MST
(User Info)

Could you be specific as to what the efficiency means?

10% is rather high for low pressure systems, when taken as heat input to shaft output.
I'm also interested in the running conditions, ie. KPA, temp, condenser vacuum etc.

I've been trying for the past year to design solar steam..... but not to change the subject. if you can actually get 10% that's great.

[ Parent ]



Re: Turbine Number Eight (3.00 / 0) (#8)
by WXYZCIENCE on Sat Feb 23rd, 2008 at 01:35:27 PM MST
(User Info)

joestue, steam is easy to generate and water is non toxic. Efficiency of steam in a single stage unit is related to the viscosity of the working fluid. I base my calculations on water entering the boiler at 190 degrees F. and steam leaving at around 350 degrees but until I actually test the unit these are not firm. You are correct, if I can achieve 10% it will be great.

Solar working fluids that are non wetting such a toluene have been successfully used for very high efficiency in a single stage turbines. I don't see myself wanting to go that direction.
Joseph.

[ Parent ]


Turbine Number Eight | 8 comments (8 topical, 0 editorial)

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