Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Commandré, Jean-Michel; Salvador, Sylvain

doi:10.1016/j.fuproc.2004.08.001

Cited by 26 publications

(18 citation statements)

References 23 publications

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“…The maximal carbon dioxide mole fraction obtained from CO2-7 reading is 15.0%. The calculated carbon dioxide mole fraction is similar to the carbon dioxide mole fractions reported in [31,32] which are 14.5% and 13.6%, respectively.…”

Section: Fire Dynamics Simulator Software Results For Burnersupporting

confidence: 86%

Multiphysics Design of Pet-Coke Burner and Hydrogen Production by Applying Methane Steam Reforming System

Davidy¹

2021

Clean Technol.

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Pet-coke (petroleum coke) is identified as a carbon-rich and black-colored solid. Despite the environmental risks posed by the exploitation of pet-coke, it is mostly applied as a boiling and combusting fuel in power generation, and cement production plants. It is considered as a promising replacement for coal power plants because of its higher heating value, carbon content, and low ash. A computational fluid dynamics (CFD) computational model of methane steam reforming was developed in this research. The hydrogen production system is composed from a pet-coke burner and a catalyst bed reactor. The heat released, produced by the pet-coke combustion, was utilized for convective and radiative heating of the catalyst bed for maintaining the steam reforming reaction of methane into hydrogen and carbon monoxide. This computational algorithm is composed of three steps—simulation of pet-coke combustion by using fire dynamics simulator (FDS) software coupled with thermal structural analysis of the burner lining and a multiphysics computation of the methane steam reforming (MSR) process taking place inside the catalyst bed. The structural analysis of the burner lining was carried out by coupling the solutions of heat conduction equation, Darcy porous media steam flow equation, and structural mechanics equation. In order to validate the gaseous temperature and carbon monoxide mole fraction obtained by FDS calculation, a comparison was carried out with the literature results. The maximal temperature obtained from the combustion simulation was about 1440 °C. The calculated temperature is similar to the temperature reported, which is also close to 1400 °C. The maximal carbon dioxide mole fraction reading was 15.0%. COMSOL multi-physics software solves simultaneously the catalyst media fluid flow, heat, and mass with chemical reaction kinetics transport equations of the methane steam reforming catalyst bed reactor. The methane conversion is about 27%. The steam and the methane decay along the catalyst bed reactor at the same slope. Similar values have been reported in the literature for MSR temperature of 510 °C. The hydrogen mass fraction was increased by 98.4%.

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Section: Fire Dynamics Simulator Software Results For Burnersupporting

confidence: 86%

Multiphysics Design of Pet-Coke Burner and Hydrogen Production by Applying Methane Steam Reforming System

Davidy¹

2021

Clean Technol.

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“…It is therefore expected that combustion of petcoke will lead to higher emissions of SO 2 . SO 2 emissions in pulverized fuel firings as mentioned earlier, normally correlate strongly with the sulphur content of the fuel and generally almost all the sulphur in the fuel is released as SO 2 (Commandre, 2005;Werther & Ogada, 1997;Spliethoff & Hein, 1998). Petcoke has low ash content which easily fuses in the cement clinker.…”

Section: Petroleum Cokementioning

confidence: 91%

“…The fixed carbon varies from 80 -92 percent (Bryers, 1995). Irrespective of the coking process, petcoke has higher calorific value than coal, typically LHV of about 32.5-35 MJ/kg (Commandre & Salvador, 2005). The use of petcoke as fuel presents several challenges due to its high sulphur content, poor ignition and burnout characteristics because of its low volatile content.…”

Section: Petroleum Cokementioning

confidence: 99%

Alternative Fuels in Cement Manufacturing

Chinyama¹

2011

Alternative Fuel

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“…The powdered solid fuel is injected through a water-cooled feeding probe and dispersed over the cross-section of the reactor. It reacts for a controlled residence time before being sampled by a water-cooled probe [38]. The well controlled solid injection consists of a low velocity (10 cm/min) conveyor belt that ensures a fuel mass flow rate from 0.5 to 1.5 g/min.…”

Section: No Heterogeneous Reductionmentioning

confidence: 99%

NO reduction capacity of four major solid fuels in reburning conditions – Experiments and modeling

Cancès

Commandré²,

Salvador³

et al. 2008

Fuel

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The combustion of solid fuels in the rotary kiln and in the calciner of a cement plant generates fuel and thermal NO. This NO can be reduced inside the reducing zone of the calciner. This occurs in two different ways: homogeneous reduction by hydrocarbons and heterogeneous reduction by char. The purpose of this paper is to identify the relative contribution of volatile matters or char on the NO reduction process, which largely depends on the nature of the solid fuel used for reburning. Experiments were undertaken in an Entrained Flow Reactor (EFR), at three temperatures: 800, 900 and 1000°C. Four major fuels used in the cement production process were studied: a lignite, a coal, an anthracite and a petcoke. Specific experiments were undertaken to determine (i) their devolatilisation kinetics and the gas species released. A wide range of species influencing the NO chemistry was carefully analyzed. Then, (ii) the char oxidation and (iii) the char NO reduction kinetics were characterized. Finally, (iv), the ''global'' NO reduction capability of each fuel was quantified through experiments during which all phenomena could occur together. This corresponds to the situation of an industrial reactor in reducing conditions. Anthracite and petcoke reduce only very small quantities of NO whereas lignite and coal reduce, respectively, 90% and 80% of the initially present 880 ppm of NO (at 1000°C after 2 s). The four types of experiments described above were then modeled using a single particle thermo-chemical model that includes heterogeneous reactions and detailed chemistry in the gas phase. This model reveals that both NO reduction on char and NO reduction by volatiles mechanisms contribute significantly to the global NO reduction. After short residence times (several tenth of a second), gas phase reactions reduce NO efficiently; after long residence times (several seconds) the char reduces larger quantities of NO.

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Lack of correlation between the properties of a petroleum coke and its behaviour during combustion

Cited by 26 publications

References 23 publications

Multiphysics Design of Pet-Coke Burner and Hydrogen Production by Applying Methane Steam Reforming System

Multiphysics Design of Pet-Coke Burner and Hydrogen Production by Applying Methane Steam Reforming System

Alternative Fuels in Cement Manufacturing

NO reduction capacity of four major solid fuels in reburning conditions – Experiments and modeling

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