Analysis and Countermeasures for Capacity of the Letdown Heat Exchanger of the Chemical and Volumetric Control System
In order to solve the problem that the outlet temperature of the hot side of the letdown heat exchanger of a nuclear power plant is lower than the set value and there is a risk of vaporization at the outlet of the cold water side,the cold water flow regulating valve is set to operate near the low limit for a long time,and it is difficult to accurately adjust the cold water flow.Using HTRI and Flowmaster software,through simulation calculation,found out that the root cause of the problem is the excessive capacity of the letdown heat exchanger.Furthermore,the simulation calculation shows that the above difficulties can be effectively solved by reducing the capacity of the letdown heat exchanger,lowering the set value of the outlet temperature at the hot side,increasing the intervention means of the cold water flow,and optimizing the selection of cold water flow regulating valve.
nuclear power plantheat exchangeranalog calculationcapacitydesign optimization
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