PURPOSE: To obtain the title system, capable of being compacted, prominent in maintenance and repairing property and capable of being started easily by remote operation, by a method wherein the title system is equipped with a liquid injection nozzle, injecting low-temperature liquid, a vapor injection nozzle, injecting vapor, a diffuser connected to a choked tube and an electromagnetic fluid power generator arranged in said choked tube.

CONSTITUTION: Heat is applied to liquid metal to make it vapor and the vapor flows into a vapor injection nozzle 22. Fluid, having a lower temperature than the same of the vapor, which enters from a vapor pipeline 30, is injected from an injection nozzle 21 into a mixing and condensing unit 39 whereby the vapor is condensed while being mixed with the fluid and high-speed flow is formed. A MHD generator 7 is arranged in a choked tube 23, in which the high-speed flow is formed, and power generation by electromagnetic induction is effected. The speed of the high-speed flow is reduced by a heat dissipating diffuser 24 and the energy of speed is converted into the energy of pressure whereby a pressure is increased. This pressure becomes a driving force to circulate the fluid.