Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Reexamination Certificate
2005-09-06
2005-09-06
Richter, Sheldon J (Department: 3748)
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
C060S657000, C060S660000, C060S682000
Reexamination Certificate
active
06938421
ABSTRACT:
A system for the control of an indirectly heated gas turbine comprising a primary system of controlling the temperature of heated compressed gas entering the expander, and an independent secondary system which includes a safety valve for instantaneous release of heated compressed gas to the atmosphere. The primary system controls system gas temperature and power output by modulating a flow of unheated compressed gas which bypasses the heat exchanger and mixes with the heated gas leaving the heat exchanger to produce a lower temperature gas entering the expander. The secondary system provides a backup means of overspeed prevention, and includes a safety valve to instantly discharge to the atmosphere hot compressed gas upstream of the expander by being responsive to the speed of the turbine. The safety valve includes a frangible membrane clamped between parallel flanges within the ducting, and further includes a dagger assembly for rupturing the membrane.
REFERENCES:
patent: 4403476 (1983-09-01), Johnson et al.
patent: 5076312 (1991-12-01), Powell
patent: 6751956 (2004-06-01), Mayer et al.
McKellar Robert L.
McKellar IP Law, PLLC
Richter Sheldon J
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