System for detecting tubing rupture in feedwater heaters of steam power plant

摘要

In a steam power plant, a system is provided for early detection of a rupture or extensive leak from the feedwater tubing in the feedwater heaters. The system senses the temperature and pressure in the steam space of each feedwater heater. A pressure rise followed by a temperature drop in the steam space of a feedwater heater is recognized as being caused by a rupture or extensive leak in the feedwater heater and in response to such occurrance, an alarm is activated and a power assisted check valve is closed in the extraction line feeding extraction steam from the turbine to the feedwater heater.