Supercritical water oxidation reactor and method suitable for radioactive waste treatment

Abstract

The invention discloses a supercritical water oxidation reactor and method suitable for radioactive waste treatment, the supercritical water oxidation reactor comprises an end cover area, a reaction area and a salt storage area, and a core area of the reaction area is provided with a scraping brush, a stirrer and other mechanical devices. A nuclide salt storage area is arranged at the bottom and is provided with a mechanical stirring device and a tertiary oxidant inlet. According to the invention, supercritical water oxidation treatment of radioactive wastes can be realized, nuclides are removed by using the characteristic that the solubility of nuclides in supercritical water is small, and meanwhile, the nuclides are mechanically removed by using a scraping brush, and meanwhile, due to the existence of the cooling film type wall, not only can the heat of a reaction area be absorbed to prevent the wall surface from being overheated, but also the waste heat of the wall surface can be utilized. And meanwhile, a sacrificial thin lining is arranged at a key part of the reactor, so that radioactive wastes generated after the device is decommissioned are minimized. The reactor has important application value in the field of supercritical water oxidation treatment of radioactive wastes.

Description

technical field [0001] The invention belongs to the field of radioactive waste treatment, and particularly relates to a supercritical water oxidation reactor and method suitable for radioactive waste treatment. Background technique [0002] As a clean energy, nuclear power has become an important part of my country's energy structure. With the emergence of a large number of nuclear power plants, the amount of radioactive waste has also increased year by year, mainly including radioactive waste ion exchange resin, radioactive waste oil, radioactive waste solvent, radioactive waste protective clothing and gloves, etc. At present, the main methods of dealing with these radioactive wastes are incineration, plasma incineration, Fenton oxidation, direct curing and so on. However, these methods have various problems. Although the incineration method can significantly reduce the volume of waste, it will cause secondary pollution such as radioactive fly ash; the plasma incineration ...

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Problems solved by technology

However, there are various problems in these methods. Although the incineration method can obviously reduce the volume of waste, it will cause secondary pollution such as radioactive fly ash; the plasma incineration method needs to add solidified materials and the tail gas treatment system is complicated; Although the reaction conditions of the oxidization method are mild, the reaction time is long and the amount of secondary waste liquid is large; the direct solidification method is simple in process, but the capacity is increased

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