Liquid metal purification device and using method thereof

Abstract

The invention provides a liquid metal purification device and a using method thereof. The liquid metal purification device comprises a storage tank, a pipeline II, a purification pipeline, a pipelineIII, an impurity storage tank, an expansion tank, a purification tank and a melting tank, wherein the bottom of the side wall of the storage tank is connected with the lower end of the purification pipeline through the pipeline II; the upper portion of the side wall of the storage tank is connected with the upper portion of the side wall of the purification pipeline through the pipeline III; the expansion tank is arranged at the upper end of the purification pipeline; an air blowing pipeline is arranged in the purification pipeline; the bottom of the purification tank is connected with the storage tank through a pipeline VI; a pipeline I is connected with the upper part of the side wall of the purification tank through a pipeline VII; and the upper part of the side wall of the purificationtank is connected with the bottom of the melting tank through a pipeline VIII. According to the liquid metal purification device, oxide impurities with a size larger than the pore size of a filter element can be effectively removed, oxide impurities with a size smaller than the pore size of the filter element can also be removed, off-line circulation purification of liquid metal is achieved underthe condition that no pump is driven, and operation of a main loop is not affected.

Description

technical field [0001] The invention belongs to the technical field of liquid metal, and in particular relates to a liquid metal purification device and an application method thereof. Background technique [0002] Because of its low melting point, high boiling point, thermal conductivity, and high safety, liquid metal has become the first choice for the new generation of nuclear reactor coolant. For example, the accelerator-driven subcritical system (ADS) uses lead-bismuth eutectic (LBE) as the reactor coolant. Lead is used as a coolant in the pile. In a reactor using liquid metal as a coolant, an important problem faced is that liquid metal coolants (lead, LBE, etc.) have severe corrosion on structural materials relative to water and other media, and the main mechanisms of corrosion are oxidation corrosion, Erosion corrosion, dissolution corrosion, etc., in order to reduce the corrosion of structural materials, the method of controlling the oxygen content is mainly used at...

AI Technical Summary

Problems solved by technology

In addition to impurities produced by corrosion, oxide impurities will also be introduced in maintenance, loading and unloading materials and raw materials, and in some circuits, such as thermal circuits, the running time is short, so it is not suitable to use the oxygen control system, and oxygen is generally supersaturated state, in which the liquid metal will be oxidized to form oxidized impurities, these impurities will accumulate to a certain extent in the circuit, it is easy to block the flow channel of the heat exchanger and the circuit pipe, change the thermal conductivity of the liquid metal, etc., and will affect the test parameters of the circuit

[0003] At present, the main methods of purification are cold trap and filter. The filter mainly relies on the filter to intercept large-sized oxides. In addition to the function of intercepting and filtering impurities of the filter, the cold trap also has a cooling function, which can dissolve and corrode impurities. Supersaturated precipitation. Under the condition of oxygen control and oxygen supersaturation, because the impurities are mainly oxides, the cold trap is only equivalent to a filter. The main method of filter purification is interception filtration, and the size of the captured impurities is limited by the pores of the filter element. size, when there are enough impurities, a filter cake may form on the surface of the filter element, which can intercept impurities whose size is smaller than the pore size of the filter element, but at this time the filter element mesh is clogged, the pressure loss will greatly increase, and the flow rate is extremely low, and the filtration time will increase infinitely , in the circuit, once the filter cake is formed, the filter element will be replaced, so for the liquid metal circuit, the main function of the filter is to intercept impurities whose size is smaller than the pore size of the filter element

At present, the filter is generally located in the main circuit, and its pressure loss is large, which affects the design parameters and construction cost of the main circuit.

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