Theoretical Study of Microwave Enhanced Thermal Decontamination of Oil Contaminated Waste

Shang, Hui; Robinson, John P.; Kingman, S.W.; Snape, Colin E.; Wu, Qun

doi:10.1002/ceat.200600279

Cited by 20 publications

(18 citation statements)

References 16 publications

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“…The results are also consistent with Shang et al. ;8, 9 these authors affirmed that the higher the moisture (water) content of the material subjected to microwave drying, the greater the removal of organic phase. This takes place because the water has the biggest dielectric constant among the components present in contaminated cuttings.…”

Section: Resultssupporting

confidence: 91%

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Microwave Drying of Drilled Cuttings in the Context of Waste Disposal and Drilling Fluid Recovery

et al. 2014

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The use of drilling fluids in oil drilling process generates solid–liquid mixtures that must be separated. One of the aims of this process is compliance with environmental laws regarding to disposal of waste from drilling activities. The present study aims to investigate the microwave drying of contaminated drilled cuttings. The aspects investigated are: cuttings size and shape, bed height, composition of the drilling fluid, and application of a sweep gas. The results show that mixtures of cuttings containing rounder and larger particles lead to greater removal of drilling fluid than mixtures that consist of less‐round and finer particles. The increase of the bed height leads to higher efficiency in terms of n‐paraffin removal. The use of a sweep gas increases the n‐paraffin removal from 75 to 90 %. The higher the water content on the drilling fluid, the greater the removal of organic phase. The microwave heating does not cause significant changes in the organic phase recovered.

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Section: Resultssupporting

confidence: 91%

“…In addition, the initial moisture content in the cuttings positively affects the process 8. According to Shang et al.,9 the free water would have the role of promoting the heating of materials, while the interstitial water would drag the hydrocarbons. Robinson et al 10.…”

Section: Introductionmentioning

confidence: 99%

Microwave Drying of Drilled Cuttings in the Context of Waste Disposal and Drilling Fluid Recovery

et al. 2014

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“…Acceptable results are achieved by using a multimode applicator for treatment of contaminated drill cutting under high microwave power between 10 to 15 kW [28]. Simulation of the field distribution and power density in microwave treatment of oil contaminated waste in Shang et al study [29] also yield very useful information in respect of location of maximum electric field strength and dependency of dielectric loss factor and microwave absorption.…”

Section: Journal Of Chemical Engineering and Process Technologymentioning

confidence: 99%

“…Simulation assessment is one of the efficient methods used to achieve the optimum design through a 3D visualisation of field distribution within the applicators and materials. This technique has been used in other studies using available electromagnetic design software [27,29] such as QuickWave-3D ® , COMSOL and Microwave Studio ® in the market. This paper was devoted to the microwave pyrolysis of High-Density Polyethylene (HDPE) for the production of fuel and other useful chemicals.…”

Section: Journal Of Chemical Engineering and Process Technologymentioning

confidence: 99%

Microwave Pyrolysis of Plastic

Khaghanikavkani¹,

Farid²,

Holdem³

et al. 2013

J Chem Eng Process Technol

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Microwave heating has been used in the chemical industry for many years for diverse applications due to advantages, such as volumetric heating, high power density, and fast and easier temperature control. The motivation of this work is to develop a methodology to use potential benefits of microwave as a heat source in plastic pyrolysis. A goal was to use the available knowledge to design and build a rotating microwave reactor, to attain homogeneous temperature distribution in anticipation of producing pyrolysis products with uniform molecular hydrocarbon distribution. Also, it was sought to investigate the effect of process parameters on products' yield and composition, and examine their suitability as fuel and useful chemicals. A rotating microwave reactor was designed and fabricated using a coaxial transmission structure without the limitations of the commonly-used enclosed glass quartz reactor, which made the design appealing for any future industrial-sized microwave reactor. The optimum pyrolysis operating condition led to the production of a suitable product for a fuel application. However these products cannot be used directly as phase change materials due to their low latent heat and very broad melting range. Fractionation of the products may also be used as phase change materials, capable of storing/releasing heat at suitable application temperature. The microwave heating provided a more uniform heating distribution, although it did not alter product composition in comparison to the conventional pyrolysis of plastic. In the small microwave reactor used in this project, microwave benefit was not evident with regards to its effect in creating uniform temperature distribution. The benefit may be clearer in an industrial-sized reactor in which heat penetration in conventional thermal reactor can be a serious problem. The pyrolysed products (oil/waxes) were quantitatively analysed using GC/FID. The results of microwave pyrolysis showed 73% oil/wax yield, with silicon carbide used as a microwave absorbent.

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“…Os estudos de descontaminação de cascalhos contaminados com fluido de perfuração de base não-aquosa, utilizando as micro-ondas iniciaram com Shang et al (2005Shang et al ( , 2006Shang et al ( , 2007, Robinson et al (2009Robinson et al ( , 2010Robinson et al ( , 2012 e passaram a ser estudados mais recentemente por Pereira (2013), Santos (2014), Panisset (2014) e Petri (2014. Os resultados reportados na literatura mostram que esta tecnologia tem potencial para substituir a centrífuga filtrante, reduzindo os teores de fase orgânica a níveis abaixo de 1%, em massa.…”

Section: Introductionunclassified

Mapeamento Da Secagem Micro-Ondas Em Cascalhos Contaminados Com Fluido De Perfuração

Carneiro

Júnior²,

Ataíde³

2015

Anais Do Congresso Brasileiro De Engenharia Química Em Iniciação Científica - Cobeq IC 2015

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RESUMO -A perfuração de poços de petróleo geram fragmentos de rochas, também chamados cascalhos, que estão contaminados com fluido de perfuração, que é injetado para a uma perfuração mais eficiente. Este cascalho contaminado precisa de um devido tratamento para que ocorra seu descarte em alto mar. Um equipamento muito utilizado nesse tratamento é a centrifuga vertical, porém ela opera muito próximo dos limites imposto pela legislação ambiental que estipula um teor de 6,9%, em massa, de contaminante no cascalho. Portanto, o equipamento de descontaminação de cascalhos de perfuração que tem sido proposto pelos autores desse trabalho é um secador via micro-ondas. Foram realizadas secagens de um cascalho de perfuração contaminado com 24,4% de fluido de perfuração BRMUL base nparafina. Utilizaram-se energias específicas de 0,200, 0,230 e 0,260 kWh/kg e uma temperatura de controle de 290ºC. Após a secagem foi feito um mapeamento de cada região do recipiente e analisado, pelo método da retorta, os teores residuais presentes em cada região. Constataram-se a influencia de alguns fatores que causam a heterogeneidade da secagem como, a existência de um gradiente de temperatura no equipamento devido aos hotspots, a localização do termopar no interior da cavidade e o tempo de secagem. Os resultados mostram que regiões próximas às bordas da bandeja apresentam um alto teor residual, regiões próximas ao termopar apresentam baixo teor residual. INTRODUÇÃOPara se perfurar um poço de petróleo utiliza-se o método de perfuração rotativo. Este método baseia-se em pressionar a broca sobre a rocha e realizar um movimento de rotação ocasionando o esmerilhamento da rocha. A retirada destes fragmentos de rocha gerados, ditos cascalhos de perfuração, é realizada pelo fluido de perfuração, que entra pelo interior da broca e retorna à superfície, pelo espaço anular entre a coluna de perfuração e as paredes do poço, carreando consigo os cascalhos.No intuito de descontaminar o cascalho da perfuração de poços e de recuperar o fluido de perfuração para sua reutilização, várias etapas de separação são necessárias. Cada equipamento desse sistema é responsável pela separação de determinada faixa de tamanho de partículas e pela diminuição dos teores de fluido (ou base sintética do fluido) do cascalho contaminado. Para adequar o cascalho aos limites ambientais previstos é empregado o "secador de cascalho" que, na verdade, é uma centrífuga filtrante. Porém, devido aos riscos operacionais e também ao fato do teor residual de fluido presente no cascalho estar muito próximo dos limites ambientais, bem como pela provável redução destes limites, há uma busca por novas tecnologias de descontaminação de cascalhos.

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Theoretical Study of Microwave Enhanced Thermal Decontamination of Oil Contaminated Waste

Cited by 20 publications

References 16 publications

Microwave Drying of Drilled Cuttings in the Context of Waste Disposal and Drilling Fluid Recovery

Microwave Drying of Drilled Cuttings in the Context of Waste Disposal and Drilling Fluid Recovery

Microwave Pyrolysis of Plastic

Mapeamento Da Secagem Micro-Ondas Em Cascalhos Contaminados Com Fluido De Perfuração

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