Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1979-10-10
1981-07-14
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60656, F01K 1302
Patent
active
042779430
ABSTRACT:
A method and apparatus for supplying superheated steam at desired temperatures and pressures to a steam turbine. First source steam from a boiler steam drum passes through a control valve to form regulated steam which is conducted through a heat exchanger where a portion of it is condensed. The partially condensed regulated steam exhausted from the heat exchanger is throttled by a throttling valve to a lower pressure to form control steam and the vapor therein is separated from the liquid. The vapor is transmitted through the heat exchanger and absorbs heat from the regulated steam also passing therethrough. Cooperative adjustment of the control valve and throttling valve permits gradual adjustment of the control steam's temperature and pressure leaving the heat exchanger. When the control valve is completely open, the temperature of the control steam leaving the heat exchanger is a maximum which cannot be increased by further manipulation of the control and throttle valves. Such control steam is supplied to the turbine when the desired steam temperature is less than the temperature of a second, higher temperature source of steam. When the desired steam temperature approaches and surpasses the regulated steam temperature, the control steam is mixed with varying amounts of the second source steam. By cooperatively regulating a second steam source control valve, the first source steam control valve, and throttling valve, the desired resultant steam temperature can be attained until the desired temperature reaches that of the second source steam. At such time, second source steam alone is routed to the turbine.
REFERENCES:
patent: 3304716 (1967-02-01), Griffin et al.
patent: 3362164 (1968-01-01), Rudd
Kesavan Krishnamurthy
Silvestri, Jr. George J.
Husar Stephen F.
Ostrager Allen M.
Telfer G. H.
Westinghouse Electric Corp.
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