Control system for heat supply as hot water from nuclear power plants equipped with condensation units
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United States of America Patent
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Jun 28, 1988
Grant Date -
N/A
app pub date -
Feb 12, 1987
filing date -
Feb 12, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a control system for heat supply as hot water from nuclear power plants equipped with condensation units. This leads to the increased efficiency of the nuclear power plant on the basis of heat extraction from the turbine and its utilization for district heating with hot water as agent. The system requires a turbine nonadjustable bleeding through which a steam flow is extracted. A flow nozzle for steam flow measurement is provided on the steam transport line, a pressure transducer which sends a signal to a comparing and control unit which receives also a signal from another pressure transducer located on the turbine first stage. The comparing and control unit actuates the motorized steam and condensate valves, performing the turbine protection in case that the steam flow extracted at the nonadjustable bleeding exceeds the allowed limit. The delivered heat control is performed indirectly by water flow variation in the secondary circuit of district heating by means of a motorized control valve. This control valve is controlled by means of a heat calculation unit which receives signals from a flow transmitter and two thermoresistances.
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