Method for controlling electric charge within the exhaust hood a

Details Method for controlling electric charge within the exhaust hood a Method for controlling electric charge within the exhaust hood a

1998-03-10

1999-11-30

Nguyen, Hoang

Power plants

Motor having exhaust fluid treating or handling means

60686, F01B 3116

Patent

active

059921528

ABSTRACT:
Sufficient negative charge density may be present in the wet steam flowing through the exhaust hood of a steam power generating unit to cause intense electrical discharges which cause severe corrosion of exposed carbon steel members and generate turbulence, decreasing power output. The electric charge density is proportional to current from a charge probe exposed to the flowing steam to ground. Electric charge density can be controlled by adjusting the concentration of ammonia in the steam supply. A small positive charge density will eliminate corrosion and minimize turbulence related to electrical discharges, thereby increasing power generated. The amount of negative charge released can also be decreased by cladding the portions of the flow guides and other carbon steel members located near to the turbine exhaust with stainless steel, or with an appropriately chosen insulating composition. These improvements may be included in the design of a new power generating unit or provided by retrofitting an existing unit.

REFERENCES:
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patent: 5483797 (1996-01-01), Rigal et al.
patent: 5735125 (1998-04-01), Tarelin et al.
Tarelin, Anatoly O. Abstract of ScD Dissertation. Kharkiv State Polytechnical University (Ukraine). Aug. 9, 1994. (Ukrainian language, 120 copies printed.).

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