Water turbines for injection wells

[MMRR]

Which type of turbine will be appropriate for injection well with diameter up to 350mm, and with groundwater lavel on 30 m deep? Recharge (injection) rate can be 50 l/s. I never hear for injection well turbine, you? If that is not in manufacture, is it possible to modify deep well pumps to operate as turbine i.e. motor as generator?

 

[waross]

I'm confused.
"is it possible to modify deep well pumps to operate as turbine i.e. motor as generator? " are you trying to pump water or generate electricity?

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[jraef]

I'm confused too. Injection implies you are FORCING water back down the well, i.e. a geothermal or underground water table recharging system. All the pumps I have seen for that are above ground (if pumps are used at all, gravity is fairly reliable for moving water down hill). But if you are wanting to reclaim energy from water falling back down a well hole, then any submersible is technically capable of that, but many, if not most, do not like being spun backwards. This would take some very careful engineering.

What are you really trying to do?

"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376

 

[MMRR]

I need turbine which will be in he well, qnd I will inject water from surface, something like recharge wells (

http://docs.docstoc.com/pdf/3188632/ff2c41ad-0180-4f26-ba98-1ceabdcc2820.pdf).

Wher to find that turbine?

 

[waross]

Find a three phase submersible pump that may be modified to pump down instead of up. Drive it with a VFD capable of regeneration and on-the-fly starting. Once the water is moving start the VFD and treat yourself to free energy.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[jraef]

Hmmm... one can patent a bath tub as a bus bar, that doesn't mean it's going to work. I wonder if the holder of that patent ever tried it out? Seems a bit fishy to me.

"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376

 

[rasevskii]

Try a search on "Flygt" submersible pumps. That company also makes a submersible water turbine that is rather widely used in small hydroelectric installations. This unit resembles a submersible pump, but is a small propeller type turbine driving an induction generator via an integrated planetary gearbox. The entire unit is under water, and has also been used installed inside vertical pipes.

It is a well-known company, I think from Sweden.

rasevskii

 

[MMRR]

Thanks!