Novel nuclear fuel reprocessing big-flow-ratio mixing and clarifying tank

Abstract

The invention relates to a novel nuclear fuel reprocessing big-flow-ratio mixing and clarifying tank which comprises an aqueous-phase outlet stage and a mixing and clarifying stage in sequential connection. The aqueous-phase outlet stage is provided with an aqueous-phase outlet and an organic-phase inlet, and the aqueous-phase outlet is provided with a height-adjustable heavy-phase weir to ensurereasonable and stable interface height and reduce organic-phase entrainment loss; the mixing and clarifying stage is provided with a mixing chamber and a clarifying chamber, a crossed stirring deviceis arranged in the mixing chamber which is not provided with a hidden chamber, an upper phase port, a lower phase port and a backflow port are arranged, and unique phase port structure enables part oforganic phase or aqueous phase to flow back, so that mass transfer needs are met while stable running is ensured; the clarifying chamber is divided into three clarifying areas, so that effective clarifying is ensured while continuous mass transfer effect is realized. The tank has the advantages that mixing and clarifying are realized through staged treatment, and the tank can run stably for a long time in the big-flow-ratio process and is stable in liquid level and interface at each stage, moderate in interface, little in phase entrainment, excellent in hydraulic performance and mass transferperformance and high in stage efficiency reaching process requirements.

Description

technical field [0001] The invention relates to nuclear fuel post-processing extraction equipment, in particular to a novel nuclear fuel post-processing large flow ratio mixing and clarifying tank. Background technique [0002] Mixing-settler is a commonly used extraction equipment in spent fuel reprocessing process. The box-type mixing and clarifying tank mainly includes two types of mixing and clarifying tanks: mechanical stirring and air pulse stirring. my country has a relatively thorough research on the air pulse stirring mixing and clarifying tank, but its stirring capacity is limited, and it is not suitable for large flow ratios and small contact ratios. system, the power reactor nuclear fuel reprocessing plant should choose a mixing and clarifying tank with a relatively large operating flow. The traditional air stirring mixing and clarifying tank and the conventional mechanical stirring mixing and clarifying tank are difficult to adapt to this system. SUMMARY OF THE...

AI Technical Summary

Problems solved by technology

Box-type mixing and settling tanks mainly include two types of mixing and settling tanks: mechanical stirring and air pulse stirring. my country has thoroughly studied air pulse stirring mixing and settling tanks, but its stirring capacity is limited, so it is not suitable for large flow ratio and small contact ratio. system, the power reactor nuclear fuel reprocessing plant should choose a mixing and settling tank with a relatively large operating flow, and the traditional air stirring mixing and settling tank and the conventional mechanical stirring mixing and settling tank are difficult to adapt to this system

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