Plasma reactor to viabilize the volumetric reduction of radioactive wastes
Carregando...
Data
Data de publicação:
2019
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
INTERNATIONAL CONFERENCE ON DOSIMETRY AND ITS APPLICATIONS, 3rd
Exportar
Resumo
Introduction
According of the International Atomic Energy Agency – IAEA, nuclear waste, also known as,
radioactive waste, is any material containing a higher concentration of radionuclides than
those considered safe by the national authorities. In Brazil, there is a National Nuclear Energy
Commission to regulate. These wastes can be generated in nuclear power plants, industries,
hospitals and research institutes.
To permanently dispose of these radioactive wastes of low and medium level of radioactivity
safely and cost effectively, these should be transformed into the physical and chemical
compounds suitable for radionuclides immobilization with maximum volume and exhaust
gaseous reduction.
Incineration is used as a treatment for a very wide range of wastes. Incineration itself is
commonly only one part of a complex waste treatment system that altogether, provides for
the overall management of the broad range of wastes that arise in society. The objective of
waste incineration, in common with most waste treatments, is to treat waste so as to reduce
its volume and hazard, whilst capturing (and thus concentrating) or destroying potentially
harmful substances.
The incineration of waste is one of the most widespread and effective technologies allowing
considerably to reduce waste volume. In this scope, among the promising technologies for
the radioactive waste treatment is the plasma technology that allows reducing substantially
the waste volume after exposing them to temperatures above 2500ºC. In the planning and
management of radioactive waste, the challenges related to plasma technology are presented
as a motivation factor for the possible implantation of plasma reactors in nuclear plants and
research centers with the objective of improving the process of radioactive waste treatment.
In this way, this work aims to evaluate the use of plasma technology for the incineration of
radioactive waste for volumetric reduction and immobilization of this waste.
Methods
In this work, a plasma reactor was used for waste incineration, and all reactor parameters
(electric energy ranges, maximum arc current, maximum working voltage, air fl ow, maximum
energy conversion effi ciency, average temperature of heated gas, heated enthalpy) was
controlled based on literature. The experiment was carried out in the plasma reactor (laboratory
scale) of LPP in the ITA, using plasma torch transferred arc and with gaseous argon oxidizing
agent. The electrical and thermal characteristics of the auxiliary systems of the plasma reactor were obtained using transducers and thermocouples. The composition of the gases in the
process was analyzed using mass spectrometer and spectrophotometer.
Results
The accuracy of the data was important to ensure good results in the process, which allowed the
extraction of relevant information from the experiments performed. The volumetric reduction
reached 92% in relation to the sample before being processed, with a peak temperature of
1800ºC. Although a larger amount of argon fl ow intensify the cooling of the inner wall of the
reactor, and further promote the dilution of the plasma, the arc voltage increases, resulting in
higher power operation.
Conclusions
In the present work a high effi ciency thermal transfer torch was characterized , able to validate
the use of the plasma jet for the treatment of radioactive waste.
Como referenciar
PRADO, EDUARDO S.P.; GONÇALVES, MAX F.S.; MIRANDA, FELIPE de S.; PETRACONI FILHO, GILBERTO; MASSI, MARCOS; POTIENS JUNIOR, ADEMAR J. Plasma reactor to viabilize the volumetric reduction of radioactive wastes. In: INTERNATIONAL CONFERENCE ON DOSIMETRY AND ITS APPLICATIONS, 3rd, May 27-31, 2019, Lisboa, Portugal. Abstract... Lisboa, Portugal: C2TN, Instituto Superior Técnico, Universidade de Lisboa, 2019. Disponível em: http://repositorio.ipen.br/handle/123456789/31020. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.