Liquid metal oxidation corrosion numerical simulation calculation method

Abstract

The invention discloses a liquid metal oxidation corrosion numerical simulation calculation method. The method comprises the following steps: establishing a geometric model of a fluid flow calculation domain in a fuel assembly; performing grid division on the geometric model of the fluid flow computational domain in the fuel assembly; a liquid metal oxidation corrosion calculation model is added, and oxide layer thickness calculation (oxide layer growth thickness and oxide layer removal thickness) is carried out in a wall grid of a fluid flow calculation domain in the fuel assembly; calculating the oxygen consumption flux in the wall grid of the fluid flow calculation domain in the fuel assembly, and obtaining the oxygen concentration distribution in the fluid flow calculation domain in the fuel assembly; calculating the oxygen concentration in the wall grid of the domain according to the internal fluid flow of the fuel assembly, judging the oxidation condition, calculating the total thickness of the oxidation layer, and updating and calculating the oxygen concentration distribution. According to the method, all important variables in the oxidation corrosion process can be simulated at the same time, and more accurate calculation data can be provided for oxygen control engineering design, impurity filtration and purification engineering design and the like in a liquid metal reactor.

Description

technical field [0001] The invention belongs to the technical field of thermal hydraulic calculation of nuclear reactors, and particularly relates to a numerical simulation calculation method for liquid metal oxidation corrosion. Background technique [0002] On the one hand, the corrosion effect of liquid metal greatly reduces the strength and support capacity of structural steel, which will increase the safety hazard of the reactor. With low oxygen levels, liquid metal dissolves metallic elements. In the case of high dissolved oxygen in the liquid metal, the surface of the structural steel will oxidize. For structural steel, oxidation itself is also a kind of corrosion, especially when the corrosion temperature is too high (above 500 ℃), or the corrosion time is too long (more than 5000 hours), at this time, the oxide layer grows too thick, which will lead to the alloy surface. The thermal conductivity drops and the temperature inside the cladding rises. On the other ha...

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Problems solved by technology

Due to the special physical and chemical characteristics of liquid metal and the microscopic nature of the oxidation and corrosion process, it is difficult to accurately measure the process by experiment

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