RU214815U1 - INSTALLATION FOR MELTING METAL RADIOACTIVE WASTE - Google Patents

Abstract

The utility model relates to an installation for melting metal radioactive waste, in relation to the nuclear, radiochemical industry for the processing of radioactive waste. Installation for melting metal radioactive waste, consisting of a melting tank made in the form of a vertical cylindrical body with a bottom and a lid, located inside the melting tank of a crucible with a body and a bottom, characterized in that an induction heater is installed in the gap between the bodies of the melting tank and the crucible, at the bottom parts of the crucible with a gap relative to its body and bottom there is a water seal, on the body of the melting tank in the upper part above the induction heater there is a branch pipe for discrete supply of metal radioactive waste, a branch pipe for draining the purified metal passes through the bottoms of the crucible and the melting tank, through the lower part of the body of the crucible between its bottom and a water seal and the lower part of the melting tank passes the slag drain pipe. EFFECT: prevention of contamination of the cleaned metal with contaminated slag is ensured. 1 ill.

Description

The utility model relates to a plant for melting metal radioactive waste, gas purification and waste conditioning in relation to the nuclear, radiochemical industry for processing radioactive waste.

A melting unit for induction remelting of metal radioactive waste is known, containing a hot chamber, a crucible with a device for turning around an axis, an inductor (see RU 2753924 C2 dated 11/18/2019, class F27B 14/06).

The disadvantage of this melting unit is a one-time loading of radioactive metal without subsequent conditioning of secondary waste and gas purification.

The closest to the proposed technical essence and the number of matching features is a gas crucible furnace containing a combustion chamber, a crucible, a cylindrical casing, a cover, a dust and gas cleaning system (application for invention No. 2019133056 dated 10/16/2019).

The disadvantage of this furnace is the inability to separately drain the cleaned metal and contaminated slag.

To eliminate these shortcomings in the plant for melting metal radioactive waste, it is proposed:

- install an induction heater in the gap between the bodies of the melting vessel and the crucible;

- in the lower part of the crucible with a gap relative to its body and bottom, place a water seal;

- on the body of the melting tank in the upper part above the induction heater, place a branch pipe for the discrete supply of metal radioactive waste;

- through the bottoms of the crucible and the melting vessel, pass the branch pipe for draining the purified metal;

- through the lower part of the crucible body between its bottom and the water seal and the lower part of the melting vessel, pass the slag drain pipe.

The essence of the plant for melting metal radioactive waste, gas purification and waste conditioning is shown in the figure, on which the following designations are adopted: 1 - hydraulic seal; 2 - bottom; 3 - induction heater; 4 - body; 5 - cover; 6 - branch pipe for loading metal radioactive waste; 7 - branch pipe draining the purified metal; 8 - slag drain pipe; 9 - melting tank; 10 - trolley with a mold; 11 - crucible.

The melting tank 9 is made in the form of a vertical cylindrical body 4 with a bottom 2 and a lid 5. A crucible 11 is installed in the melting tank 9, containing a body and a bottom. Inside the crucible 11 there is a water seal 1 to ensure separate draining of the cleaned metal and contaminated slag. The heating of the crucible 11 with radioactive metal is provided by an induction heater 3 located between the bodies of the melting vessel and the crucible 11. The purified metal is drained through the drain pipe 7, which passes through the bottoms of the crucible and the melting tank 9. The slag drain pipe 8 passes through the lower part of the crucible body 11 between its bottom and hydraulic seal 1 and the lower part of the melting tank 9.

Installing the melting of metal radioactive waste operates as follows. Metallic radioactive waste with flux is fed discretely-continuously into the crucible 11 through the metal radioactive waste loading pipe 6. The induction heater 3 is turned on. The metal is heated to a melt temperature of ~1600°C. Upon reaching the level of the drain hole, the molten metal is drained through the purified metal drain pipe 7 into the mold 10. The metal is poured into the mold 10 continuously as the canisters with MPO enter the crucible 11 and melt. The slag with radionuclides is drained through the slag drain pipe 8. From the gas cavity of the melting vessel 9, through the cover 5, the radioactive gas is constantly drawn out.

The proposed installation for the remelting of metallic radioactive waste has successfully passed the tests. 100 kg of radioactive metal waste contaminated with radionuclides ¹³⁷ Ce, ²⁴¹ Am were melted down.

EFFECT: expanding the functionality of the plant for melting metal radioactive waste.

Claims (1)

Installation for melting metal radioactive waste, consisting of a melting tank made in the form of a vertical cylindrical body with a bottom and a lid, located inside the melting tank of a crucible with a body and a bottom, characterized in that an induction heater is installed in the gap between the bodies of the melting tank and the crucible, at the bottom parts of the crucible with a gap relative to its body and bottom there is a water seal, on the body of the melting tank in the upper part above the induction heater there is a branch pipe for discrete supply of metal radioactive waste, a branch pipe for draining the purified metal passes through the bottoms of the crucible and the melting tank, through the lower part of the body of the crucible between its bottom and a water seal and the lower part of the melting tank passes the slag drain pipe.

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