Combustion characteristics of simulated gas fuel in a 30kg/h scale pyrolysis-melting incinerator

Shin, Dong Ku; Yu, Tiantang; Yang, Won Seok; Jeon, Bo-Young; Park, Seung Ho; Hwang, Jungho

doi:10.1016/j.wasman.2007.11.016

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…It has been recognized in the literature that both the fuel properties and the process conditions affect the combustion mechanisms, altering the heat generation, heat transfer, and reaction rates in a complicated manner [15]. Only a handful of experimental works on co current combustion have been carried out until now (more recently Pironi et al [16], Vantelon et al [17], Zhou et al [18], Fang et al, [19], Changkook et al [20]).…”

Section: Literature About Oil Shale (Os) and Semicoke (Sc) Combustionmentioning

confidence: 99%

Reducing CO2 emissions from oil shale semicoke smoldering combustion by varying the carbonate and fixed carbon contents

Sennoune

Salvador

Quintard

2011

Combustion and Flame

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One technique used to recover oil from ground oil shale, or to burn oil shale semicoke, consists of propagating a smoldering front through a packed bed. One drawback of this technique is that the mineral structure of the shale is decarbonated due to the high temperature of the front. This phenomenon causes 70% of the CO 2 emissions released during such processes. The remaining 30% result from the fixed carbon oxidation. With the aim of decreasing the front temperature and thus avoiding decarbonation at the front passage, the impact of two parameters was experimentally tested in this work: first, increasing the amount of carbonates, as they may play the role of a heat sink, and second, decreasing the amount of fixed carbon in the medium. It is shown that increasing the amount of carbonates can only decrease the front temperature to 800°C but not lower, which is still too high to avoid decarbonation. On the other hand, the front temperature can be decreased enough for decarbonation to be almost completely avoided by reducing the amount of fixed carbon. At the low temperatures reached, almost all the fixed carbon is oxidized, but not all the oxygen transported in the air is consumed by the chemical front. The velocity of the front is consequently decreased.

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Section: Literature About Oil Shale (Os) and Semicoke (Sc) Combustionmentioning

confidence: 99%

Reducing CO2 emissions from oil shale semicoke smoldering combustion by varying the carbonate and fixed carbon contents

Sennoune

Salvador

Quintard

2011

Combustion and Flame

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Mixing of an Oil Shale With Inert or Reactive Media to Avoid Decarbonation at the Passage of a Combustion Front

et al. 2010

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Description of the materialGround oil shale semicoke was prepared in a laboratory retorting furnace under inert atmosphere. A laboratory combustion cell was then used to operate the combustion of the semicoke added with more or less sand and/or carbonates. This enabled to vary independently the amount of CaCO3 and the amount of fixed carbon in the mix. The temperature of the combustion front propagating in this mix was recorded, together with its velocity. The flue gas was analysed. ApplicationPropagating a combustion front through a fixed bed is a way to produce oil and a fuel gas from oil shale or to recover energy from oil shale semicoke in the retort process. When operated with air, this process involves high temperaturestypically larger than 1000C B0C -resulting in the decarbonation of the carbonate matrix and the emission of additional CO2. The aim of this work was to avoid this decarbonation. Results, Observations, and ConclusionsIt is shown that increasing the amount of CaCO3 in the medium (with constant fixed carbon amount) can decrease the combustion front temperature down to 800C B0C but not below, which is not sufficient to avoid decarbonation.Decreasing the amount of fixed carbon can decrease the temperature down to 600C B0C, a temperature at which decarbonation occurs only a bit. At this temperature, not all the oxygen in the fed air is used, which results in a slowing down of the combustion front. SPE 138143Significance of Subject Matter To our knowledge, no results have been published yet where the two parameters of carbonate amount and fixed carbon amount were varied independently, and where their impact on the front temperature and decarbonation were determined. Avoiding decarbonation in such processes is a potential very significant way to reduce CO2 emissions.

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Combustion characteristics of simulated gas fuel in a 30kg/h scale pyrolysis-melting incinerator

Cited by 2 publications

References 9 publications

Reducing CO2 emissions from oil shale semicoke smoldering combustion by varying the carbonate and fixed carbon contents

Reducing CO2 emissions from oil shale semicoke smoldering combustion by varying the carbonate and fixed carbon contents

Mixing of an Oil Shale With Inert or Reactive Media to Avoid Decarbonation at the Passage of a Combustion Front

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