THE THERMAL CIRCUIT OF A ONCE-THROUGH BOILER-TURBINE UNIT
In order to reduce heat losses, it is important to be able to start up a once-through boiler with gradually increasing steam output corresponding to the turbine requirements. The difficulty is to maintain steady flow conditions in the boiler while the turbine is being started. This difficulty prompted the development of a special separator circuit for starting-up. The circuit uses a start-up device which separates the evaporative and superheater parts of the boiler. By this means the appropriate flow of water can be maintained in the evaporative part with gradually increasing flow through the superheater. The principles of operation of the arrangement are described. One variation of the thermal circult allows the boiler and turbine to be started up simultaneously. It is calculated that simultaneous starting of the given turbine and boiler in this way economizes about 500 tons of conventional fuel per start. Using another variation of the thermal circuit, a schematic diagram of which is given, the set can be kept in service during sudden load changes. The additlonal equipment required for this purpose is describedThe method of operation is explained. Although the second circuit permits the set to run even at no-load, such flexibility is rarely necessary. It was recommended that the simplified thermal circuit for the first sets be installed in large power systems. Test results illustrating a sudden stop and restart of an experimental boiler are plotted graphically. (TCO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-13-020418
- OSTI ID:
- 4245050
- Journal Information:
- Teploenergetika, Vol. Vol: No. 3; Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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