Process Development and Reactor Analysis of Coal Pyrolysis to Acetylene in Hydrogen Plasma Reactor

Chen, Jiaqi; Cheng, Yi

doi:10.1252/jcej.08we133

Cited by 19 publications

(8 citation statements)

References 12 publications

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“…CFD simulations of coal gasification in a downer reactor have been carried out using an Eulerian–Lagrangian method, where the coal devolatilization is the first step of the reactions followed by a series of homogeneous and heterogeneous reactions . The comprehensive discrete particle method coupled with coal pyrolysis parameters from the CPD model was utilized for simulating coal gasification and pyrolysis in thermal plasma downer reactors. − However, because of the fact that the discrete particle method is computationally very demanding, it is not suitable for simulating large-scale reactors.…”

Section: Introductionsupporting

confidence: 81%

Multifluid Modeling of Coal Pyrolysis in a Downer Reactor

Zhan

Fan

et al. 2016

Ind. Eng. Chem. Res.

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Downer is a promising reactor for coal pyrolysis, where the energy used for coal pyrolysis comes from the heat carrier particles. However, fundamental studies are limited regardless of its practical importance. To this end, a multifluid model is established to study the hydrodynamics, heat, mass transfer, and chemical reaction in a downer reactor: The conservation equations of mass, momentum, and energy are closed with proper models for interphase mass, momentum, and heat transfer, including the particle radiation mechanism and with advanced kinetic theory for particulate phase stresses and particle−particle drag coefficients. Species transport equations, the reaction kinetic model, and the water evaporation model are also coupled. Computational fluid dynamics simulations highlight the importance of feeding temperature in coal pyrolysis and indicate that the gas−solid heat transfer and particle radiation are the major heat transfer mechanisms, whereas the direct particle−particle heat transfer is negligible. The simulations prove qualitatively the rationality of the model for coal pyrolysis.

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Section: Introductionsupporting

confidence: 81%

Multifluid Modeling of Coal Pyrolysis in a Downer Reactor

Zhan

Fan

et al. 2016

Ind. Eng. Chem. Res.

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“…A comprehensive CFD‐DPM has been established to describe the complex gas‐particle reacting flow of coal pyrolysis, which takes place under ultrahigh temperature with millisecond(s) reaction time in hydrogen plasma reactors. With the significant improvements on the previous work, the model predictions are shown to be in good agreement with the performances of both pilot‐plant reactors and conclude that an appropriate tar cracking mechanism should be considered for such an ultrahigh temperature and ultrafast pyrolysis process.…”

Section: Discussionsupporting

confidence: 53%

“…Both results showed sound agreement with the experimental data. Chen and Cheng established a comprehensive model incorporating CPD model to describe the complex gas‐particle reaction behavior of coal pyrolysis, and the results qualitatively agreed with the major operational experience on the 2‐MW pilot‐plant reactor.…”

Section: Introductionsupporting

confidence: 55%

“…To further investigate the detailed particle devolatilization behavior and predict the scale‐up performance to a 5‐MW reactor, the above particle heat‐transfer mechanisms (Shuang et al) has been taken into account in the CFD approach together with the physical models of coal devolatilization, and the tar cracking reactions, forming a comprehensive modeling scheme [i.e., CFD with discrete phase model (DPM)]. Here, the improved CPD model is applied to describe the devolatilization behavior of rapidly heated coal based on the physical and chemical transformations of the coal structure.…”

Section: Introductionmentioning

confidence: 99%

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Cross‐Scale Modeling and Simulation of Coal Pyrolysis to Acetylene in Hydrogen Plasma Reactors

Yan

Cheng

2013

AIChE Journal

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Coal pyrolysis to acetylene in hydrogen plasma is carried out under ultrahigh temperature and milliseconds residence time. To better understand the complex gas-particle reaction behavior, a comprehensive computational fluid dynamics with discrete phase model has been established, with special consideration of the particle-scale physics such as the heat conduction inside particle. The improved chemical percolation devolatilization model that incorporates the tar cracking reactions is adopted. The model predictions are in good agreement with the performances of two pilot-plant reactors. The simulations reveal the detailed unmeasurable information of gas phase and particle-scale behaviors, then point out the facts that coal devolatilization almost finishes in the first 100 mm of the reaction chamber and the optimal particle diameter is suggested to be 20-50 lm. The different reactor performances during the scale-up from 2-to 5-MW unit are analyzed based on the detailed simulation results in combination with the operational experience.

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“…The conversion of coal to the desired acetylene product takes place in milliseconds, with hydrogen, ethylene, methane, and CO, as the primary byproducts. [8][9][10] The attractive features of this process are: it is coalbased, clean, one-step conversion technology, without direct emission of carbon dioxide, and without the need for water as feedstock. 11 At present, a demonstration pilot plant with the plasma power input of 5-MW, including reaction, separation and the common facilities, has been successfully built and run for industrial testing by the Xinjiang Tianye Group.…”

Section: Innovations In Clean Energy and Low-carbon Techniquesmentioning

confidence: 99%