Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1976-07-23
1979-01-02
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60657, 60663, 290 40A, F01K 1392
Patent
active
041320760
ABSTRACT:
The invention concerns a feedback control method for controlling the starting of a steam turbine unit comprising a reheater, a turbine by-pass system consisting of a HP-by-pass system and a LP-by-pass system, at least one regulating valve for the HP-by-pass system, at least one regulating valve for the LP-by-pass system, at least one inlet valve for the HP-turbine, at least one intercept valve for the MP/LP-turbine and a governing device to regulate the turbine speed or power output, according to which method during no-load and low-load operation and up to a predetermined partial load the pressure within the reheater is regulated by a first feedback control device with the LP-by-pass regulating valve acting as positioning element in such manner that a greater quantity of steam will flow through the HP-turbine than through the MP-turbine, and a smaller quantity of steam through the HP-by-pass system than through the LP-by-pass system, whereby a maximum permissible HP-exhaust steam temperature will not be exceeded, and when the partial load is greater than said predetermined value the pressure within the reheater is regulated by a second feedback control device with the intercept valves acting as positioning elements until the intercept valves are fully open, while the LP-by-pass regulating valve is closed during this part of the operation. The invention also concerns an apparatus for the practical application of the method.
REFERENCES:
patent: 3561216 (1971-02-01), Moore, Jr.
patent: 3813884 (1974-06-01), Ishikawa
patent: 3894394 (1975-07-01), Braytenbah et al.
BBC Brown Boveri & Company Limited
Husar Stephen F.
Ostrager Allen M.
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