Electrostatic method and device to increase power output and...

Details Electrostatic method and device to increase power output and... Electrostatic method and device to increase power output and...

2007-08-07

2007-08-07

Nguyen, Ninh H. (Department: 3745)

Rotary kinetic fluid motors or pumps

Method of operation

C415S169200, C060S685000

Reexamination Certificate

active

11034907

ABSTRACT:
The wet steam exiting a low pressure steam turbine does not rapidly attain thermodynamic equilibrium because insufficient condensation nuclei are present in the phase transition zone inside the turbine. Therefore, the steam is subcooled, decreasing the power generated by the turbine, and the liquid water carried by the steam consists of relatively coarse droplets which strike the surface of the turbine blades causing erosion. Corona electrodes installed inside the turbine before the saturation line create electrically charged particles which serve as condensation nuclei, decreasing subcooling, and producing a large number of fine droplets. Thereby, thermodynamic equilibrium is more closely approached, more power is generated, and smaller water droplets cause less erosion inside the turbine.

REFERENCES:
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patent: 5735125 (1998-04-01), Tarelin et al.
patent: 5992152 (1999-11-01), Weres et al.
patent: 6672825 (2004-01-01), Tarelin et al.
patent: 6698205 (2004-03-01), Tarelin et al.
Dooley et al. “Studies of electrostatic charge effects relating to power output from steam turbines.” PowerPlant Chemistry, v7, n2, Feb. 2005 at pp. 75-76.
Cite #3 was presented at a conference in Japan on Aug. 29, 2004 which predates the instant application, but postdates our PPA U.S. Appl. No. 60/535,905, benefit of which is claimed, filed Jan. 12, 2004.

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