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Self Feeding Steam Turbine

  1. Jun 15, 2014 #1
    I'm trying to design or find a design for a steam turbine that recycles it's water, or at least a large percentage of it, to prevent refilling of a boiler tank.

    My thoughts;

    The turbine will be powered by steam heated through copper tubing which is fed from a large unheated, (or partially heated) water tank. The water, upon entering the coiling tubing, will be heated from an external fire of whatever fuel I desire. My problem is trying to decide how to separate the pressure build up in the coiled tubing from the supply tank to prevent the pressure from going back into the tank. Or if my tank was large enough, would it simply push it out the top of my tubing directed at my turbine instead of going back into my supply tank? I think this would result in power loss.

    The turbine does not have to run full power constantly. It could run on bursts. Oh, just thought of a solution...maybe.

    If there was a water valve that opened and closed to feed the coiled tubing, upon entering the extremely hot tubing, the water would vaporize immediately and be forced out of the end of my tube pointed to my steam turbine. But would that cause the tubing to burst from cooler water hitting it? This also presents a problem of needing something to turn my valve off and on.

    A check valve that is pushed open by the weight of the water and fills the hot tubing, and when the hot tubing builds pressure, the check valve will be forced closed thus forcing the steam out of the end of my tube aimed at my steam turbine.

    A further note, I'm more interested in torque than rpm, if anyone has any links or information for me to further my project, it would be greatly appreciated.

    Thanks for taking the time to read my post.

    Mr. Diedel

    P.S. Of course the recycling part would be easily enough done with a condenser over the main holding tank, as it would be open to atmospheric pressure at the top.
    Last edited: Jun 15, 2014
  2. jcsd
  3. Jun 16, 2014 #2
  4. Jun 21, 2014 #3

    Doug Huffman

    User Avatar
    Gold Member

    Feed pump discharge pressure equals steam drum operating pressure at shut-off head. Feed pump discharge pressure must be higher than steam drum operating pressure to raise steam drum level. The feed regulator valve is on the discharge of the centrifugal pump that operates well at shut-off head with packing cooled by leakoff. A steam powered feed pump may have a throttle for efficiency. The steam drum and tubes are at saturation pressure and temperature. A steam turbine powered pump cannot function with wet steam water droplets. Some condensate depression, temperature lower than saturation, is necessary.

  5. Jun 23, 2014 #4
    If you are interested in torque rather than RPM maybe a recip engine is the way to go.
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