Abstract: A conduit extends from a platform or a fixed structure above a deep cavity filled with deep liquid which contains dissolved gases. Sufficient liquid is drawn from the top of the conduit to cause gas containing deep liquid to enter the lower end of the conduit and release dissolved gas thereby forming a foam which causes the bulk density of the foam to fall. The change in bulk density causes the foam to move upward through the conduit pushing the foam to higher heights in an effort to reach pressure equilibrium inside and outside the conduit at a level of incipient foaming. The energy of the moving foam is used to drive a turbine or otherwise provide useful energy.

Abstract: A conduit extends from a platform on the surface of the ocean into cold deep ocean water containing dissolved gases. Sufficient water is drawn from the top of the conduit to cause the gas containing cold deep ocean water to enter the lower end of the conduit and release dissolved gas thereby forming a foam which causes the bulk density of the foam to fall. The change in bulk density causes the foam to move upward through the conduit pushing the foam to higher heights in an effort to reach pressure equilibrium inside and outside the conduit at a level of incipient foaming. The moving foam is used to drive a turbine or otherwise provide useful energy.

Abstract: Enthalpy is recovered from hot industrial effluents by converting a working fluid into a foam in a flashing unit and using the foam to propel a turbine located within or at the output of the flashing unit. For liquid effluents the effluent itself serves as the working fluid. For gaseous effluents a liquid is heated by the gas and then the liquid is used as the working fluid. If the effluents contain undesirable levels of pollutants working fluid is cleaned before it is flashed. The specification discloses both impulse and reactive turbines which the foam can propel.

Abstract: Pollutants are removed from a hot industrial effluent after which enthalpy is recovered from the hot effluent by converting a working fluid into a foam in a flashing unit and using the foam to propel a turbine. For liquid effluents the effluent itself serves as the working fluid. For gaseous effluents the scrubbing fluid used to remove pollutants is used as the working fluid.

Abstract: An improved method and apparatus for producing electricity utilizing the enthalpy released by a rising foam in a plurality of closed environments to generate power to drive a turbine. The closed environments are interconnected in a manner to permit the effluent from each closed environment to be used in an adjacent closed environment.