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    Simulation of Char Dust Combustion Inside a Pyroscrubber Downstream of a Petroleum Coke Calcining Kiln

    Source: Journal of Thermal Science and Engineering Applications:;2012:;volume( 004 ):;issue: 001::page 11010
    Author:
    Zhao Lei
    ,
    Wang Ting
    DOI: 10.1115/1.4005287
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A pyroscrubber is a furnace used in the petroleum coke calcining industry to recover energy from the carbonaceous contents, including char dust and hydrocarbon volatiles of the exhaust gas from the calcination kiln. The combusted hot gases are used to generate steam and produce electricity, so it is important to optimize the pyroscrubber performance to produce high-grade combusted gases to generate steam but with minimal emissions. A previous study employed the locally-homogeneous flow (LHF) model to study the means to improve combustion efficiency and reduce emissions. In the LHF model, the interphase exchange rates of mass, momentum and energy are assumed to be infinitely fast, so the dispersed phase (char dust) can be simplified as the gas phase, and the complex two-phase flow is then treated as a single-phase flow. In this study, LHF model is replaced with a solid particle combustion model by incorporating both finite-rate heterogeneous and homogeneous combustion processes. Results reveal that the particle combustion model generates much higher local flame temperature (2200 K) than in LHF model (1800 K). All char particles are burned before or in the high-bay area. Total energy output of the case with particle combustion model is 92% of the LHF model. Furthermore, motivated by the potential energy saving from removing the air blower power supply, this study further investigates the possible benefit of running the pyroscrubber with the ventilation doors open. Three cases with different combinations of air injections and door opening have been studied. Results show that the gas flow is stably stratified with a large amount of the entrained cold air moving at the bottom of the chamber and the hot combusted gas moving through the top. With the bottom doors completely open, sufficient air can be drawn into the pyroscrubber without the need of blowing air in, but the combustion gases will be overcooled making this practice unfavorable from the energy saving point of view.
    keyword(s): Flow (Dynamics) , Temperature , Combustion , Particulate matter , Kilns , Coke , Dust , Roasting (Metallurgy) , Simulation , Petroleum , Doors AND Gases ,
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      Simulation of Char Dust Combustion Inside a Pyroscrubber Downstream of a Petroleum Coke Calcining Kiln

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    http://yetl.yabesh.ir/yetl1/handle/yetl/150305
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    • Journal of Thermal Science and Engineering Applications

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    contributor authorZhao Lei
    contributor authorWang Ting
    date accessioned2017-05-09T00:54:35Z
    date available2017-05-09T00:54:35Z
    date copyrightMarch, 2012
    date issued2012
    identifier issn1948-5085
    identifier otherJTSEBV-28838#011010_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/150305
    description abstractA pyroscrubber is a furnace used in the petroleum coke calcining industry to recover energy from the carbonaceous contents, including char dust and hydrocarbon volatiles of the exhaust gas from the calcination kiln. The combusted hot gases are used to generate steam and produce electricity, so it is important to optimize the pyroscrubber performance to produce high-grade combusted gases to generate steam but with minimal emissions. A previous study employed the locally-homogeneous flow (LHF) model to study the means to improve combustion efficiency and reduce emissions. In the LHF model, the interphase exchange rates of mass, momentum and energy are assumed to be infinitely fast, so the dispersed phase (char dust) can be simplified as the gas phase, and the complex two-phase flow is then treated as a single-phase flow. In this study, LHF model is replaced with a solid particle combustion model by incorporating both finite-rate heterogeneous and homogeneous combustion processes. Results reveal that the particle combustion model generates much higher local flame temperature (2200 K) than in LHF model (1800 K). All char particles are burned before or in the high-bay area. Total energy output of the case with particle combustion model is 92% of the LHF model. Furthermore, motivated by the potential energy saving from removing the air blower power supply, this study further investigates the possible benefit of running the pyroscrubber with the ventilation doors open. Three cases with different combinations of air injections and door opening have been studied. Results show that the gas flow is stably stratified with a large amount of the entrained cold air moving at the bottom of the chamber and the hot combusted gas moving through the top. With the bottom doors completely open, sufficient air can be drawn into the pyroscrubber without the need of blowing air in, but the combustion gases will be overcooled making this practice unfavorable from the energy saving point of view.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSimulation of Char Dust Combustion Inside a Pyroscrubber Downstream of a Petroleum Coke Calcining Kiln
    typeJournal Paper
    journal volume4
    journal issue1
    journal titleJournal of Thermal Science and Engineering Applications
    identifier doi10.1115/1.4005287
    journal fristpage11010
    identifier eissn1948-5093
    keywordsFlow (Dynamics)
    keywordsTemperature
    keywordsCombustion
    keywordsParticulate matter
    keywordsKilns
    keywordsCoke
    keywordsDust
    keywordsRoasting (Metallurgy)
    keywordsSimulation
    keywordsPetroleum
    keywordsDoors AND Gases
    treeJournal of Thermal Science and Engineering Applications:;2012:;volume( 004 ):;issue: 001
    contenttypeFulltext
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