Method of starting up turbines

Details Method of starting up turbines Method of starting up turbines

1977-02-15

1978-10-24

Ostrager, Allen M.

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

60657, 60660, 415 17, 415 30, 364300, F01K 1302

Patent

active

041214242

ABSTRACT:
At the point of time to when the turbine speed has come up to a first speed N.sub.1, a thermal stress expected in the turbine when the speed is increased to a second speed N.sub.2 at a rate .alpha..sub.1 is presumed. Thermal stress .sigma..sub.s(t) -.sigma..sub.sT1 at the point of time t.sub.o1 for commencing acceleration to the second speed N.sub.2 is then obtained, which point of time t.sub.o1 would never cause the maximum value of the presumed thermal stress to exceed a predetermined limit .sigma..sub.sl of the thermal stress when the turbine speed is increased at that rate. Then, a length of time T.sub.w1, referred to as a warming time, is determined which is required for the thermal stress .sigma..sub.s(t) to decrease to the level of (.sigma..sub.s(t) -.sigma..sub.sT1) when the warming is continued after the point of time t.sub.o. Subsequently, a length of time (N.sub.2 -N.sub.1)/.alpha..sub.1 required for increasing the turbine speed from N.sub.1 to N.sub.2 at the rate .alpha..sub.1 is calculated. The sum of the warming time T.sub.w and the time (N.sub.2 - N.sub.1)/.alpha..sub.1 required for acceleration is calculated. The lengths of time for starting T.sub.1, T.sub.2, T.sub.3 are found for each of the acceleration rates .alpha..sub.1, .alpha..sub.2, .alpha..sub.3 in speed. The acceleration of the turbine is commenced at the time and with the rate which in combination provide the smallest sum T of time.

REFERENCES:
patent: 3446224 (1969-05-01), Zwicky
patent: 3561216 (1971-02-01), Moore
patent: 3577733 (1971-05-01), Manuel
patent: 3588265 (1971-06-01), Berry
patent: 3928972 (1975-12-01), Osborne

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