Abstract
The paper summarizes the results of a number of starting tests, after unit shutdowns of 6 and 36 hours respectively, conducted collaboratively by the manufacturers of the principal generating plant and the C.E.G.B. on a 100-MW reheat unit, in October-November 1959, and on a 120-MW reheat unit in June-July 1961.
The units were extensively instrumented for the tests and many steam and metal temperature measurements on the boiler, pipework and turbine were taken at regular short intervals to determine the thermal condition of the unit during the shutdown and starting operation.
The tests were conducted on the basis of carefully planned and agreed operational procedures, within the framework of the working limits recommended by the manufacturers of the principal generating plant.
It was demonstrated that the units could be satisfactorily and quickly started up to full load with a drainage loss of about 22 000 lb, after a 6-h shutdown, and with a drainage loss of approximately 20 000 lb, and 52 000 lb, after a 36-h shutdown, for the 120-MW and 100-MW unit respectively, without exceeding the recommended limits.
It was possible to operate the 100-MW unit at full load in 64 min, and 120-MW unit in 51 min from lighting the boiler, after a 6-h shutdown. The minimum turbo-generator loading times were 25 and 11 1/2 min respectively.
After a 36-h shutdown the 100-MW unit was brought up to full load in about 200 min and the 120-MW unit brought up to full load in about 170 min from lighting the boiler. The corresponding loading times were 110 and 55 1/2 min respectively.
Information obtained from the tests has been used in designing new plant.
The paper includes descriptions of the plant installed, instrumentation used, and the development of the tests. The recommended procedures for two-shift operation of these units are also given, based on the results obtained.
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