A device and operation method for evaporating liquid metal sodium under high temperature and high pressure

Abstract

The invention provides a device for evaporating liquid metal sodium under high temperature and high pressure, which includes an outer cylinder, a thermocouple, an external temperature control device, a flange, a sodium storage cup, a vacuum pumping and gas replacement connecting pipe, and a cooling plate connecting pipe; The device for evaporating liquid metal sodium under high temperature and high pressure in the scheme adopts the structure of coiled tube in its cooling structure, and the outlet pipe of the coiled tube is connected to the upper head of the evaporation device by welding. The coiled tube structure can withstand The large pressure load can meet the evaporation demand under the pressure condition of up to 10MPa. At the same time, the cooling medium flows inside the coil to directly cool the coil, and the thermal resistance is small, which improves the utilization efficiency of the cooling medium. The wall thickness of the evaporation device in the present invention is moderate, which not only meets the evaporation requirements under high temperature and high pressure, but also has a weight suitable for the operation of the operator in the glove box; in addition, the device of the present invention uses a graphite-coated gasket, which can meet the requirements of evaporation without cooling. Sealing of evaporators at high temperatures.

Description

technical field [0001] The invention relates to the technical field of metal sodium evaporation research, in particular to a device and an operation method for evaporating liquid metal sodium under high temperature and high pressure. Background technique [0002] In systems or equipment related to liquid metal sodium, liquid metal sodium in a high temperature state (up to 550° C.) will evaporate to form a large amount of sodium vapor. According to the literature (Sodium and Potassium Engineering Handbook (Internal Data) [M]. "Fast Reactor Research" Editorial Group, translation. 1986) report, it can be known that sodium vapor can be caused by diffusion under isothermal conditions, convection caused by temperature difference, and agitation. Processes such as mechanical convection, turbulent flow at free surfaces are transferred to the covering gas. The sodium vapor covering the airborne zone may condense due to the drop in temperature during the transfer process, causing pipe...

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Problems solved by technology

[0005] The distillation device for sodium under vacuum is mainly suitable for low pressure (absolute pressure 10 -3 Pa), the temperature is below 450°C, and a large amount of cooling water is required to cool the flange and other places, so it is not suitable for the evaporation of sodium under high temperature and high pressure.

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