Marine nuclear power heat pipe type waste heat removal system stable operation condition analysis method

Abstract

The invention provides a marine nuclear power heat pipe type waste heat removal system stable operation condition analysis method which comprises the steps: 1, determining heat pipe parameters, and establishing a heat pipe model; 2, determining the number and distribution of heat pipes in a heat pipe exchanger; 3, initially setting working conditions of the marine nuclear power heat pipe type waste heat removal system; 4, establishing a mathematical physical model of the marine nuclear power heat pipe type waste heat removal system; 5, calculating the thermal hydraulic characteristics of the system through a Gear algorithm; 6, checking whether the heat pipe has a heat transfer limit or not, wherein the system is unstable if the heat transfer limit occurs; 7, checking the seawater flowing state and the outlet supercooling degree of the marine nuclear power heat pipe type waste heat removal system, and if nucleate boiling occurs or the supercooling degree is smaller than 10 DEG C, indicating that the system is unstable; 8, if any one of the steps 6 and 7 occurs, carrying out the steps 3-7 again, otherwise, outputting a calculation result; 9, changing working conditions, repeating the steps 3-8, and obtaining the working condition range during stable operation; according to the method, suggestions and guidance are provided for safe and stable operation of the marine nuclear power system.

Description

technical field [0001] The invention relates to the flow heat exchange of a passive waste heat discharge system in the technical field of marine nuclear power, in particular to a method for analyzing stable operating conditions of a marine nuclear power heat pipe type waste heat discharge system. Background technique [0002] After the Fukushima nuclear accident, the safety device for the passive removal of waste heat from the core of nuclear reactors has been widely studied by scholars. The working marine environment is the most ideal and convenient heat sink for exhausting waste heat, which is a natural advantage. The C-type heat exchanger in the passive waste heat removal system of a typical nuclear reactor AP1000, the principle is that the reactor coolant flows through the tube, and the cooled seawater flows through the shell side for heat exchange. This type of heat exchanger is used in reactors in harsh marine environments Then there are potential safety hazards: (1) ...

AI Technical Summary

Problems solved by technology

The C-type heat exchanger in the passive waste heat removal system of a typical nuclear reactor AP1000, the principle is that the reactor coolant flows through the tube, and the cooled seawater flows through the shell side for heat exchange. This type of heat exchanger is used in reactors in harsh marine environments Then there are potential safety hazards: (1) fluid circulation requires power, and passive performance is insufficient; (2) the coolant in the main circuit is radiated by nuclear fuel, if the heat exchange pipe or connecting pipe and baffle are damaged, the radioactive coolant will leak and produce Dangerous; (3) When the nuclear reactor is shut down or in an accident condition, the passive waste heat removal system is put into operation, and the high-temperature and high-pressure coolant suddenly flows into the heat exchanger tube to exchange heat with the low-temperature and low-pressure seawater outside the tube, and the heat exchange capacity inside and outside the tube does not match , seawater is prone to local overheating and boiling, which is prone to water hammer and vibration damage to the heat exchanger; (4) If one tube fails, it will cause the entire heat exchanger to fail to operate normally

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