Modelling of an entrained flow coal gasifier. 2. Effect of operating conditions on reactor performance

Vamvuka, Despina; Woodburn, E.T.; Senior, P.

doi:10.1016/0016-2361(95)00115-l

Cited by 24 publications

(30 citation statements)

References 8 publications

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“…The agreement between the two models was reasonable, despite some differences in operating conditions as mentioned earlier. These findings are also consistent with those reported by Vamvuka et al, where the magnitude of CO 2 is overestimated for comparable conditions [13]. This difference may be because of either the WGS dominance at reduced temperatures or the weaker solid reaction in the work of Vamvuka.…”

Section: Gassupporting

confidence: 83%

“…Those effects are discussed further in the section titled "Mechanism of CO variation between reactor model and equilibrium model". However, the presence of optimal carbon conversion was not observed in the numerical results of Vamvuka [13].…”

Section: Gasmentioning

confidence: 82%

“…However, the presence of optimal carbon conversion was not observed in the numerical results of Vamvuka [13].…”

Section: Gasmentioning

confidence: 82%

“…They also predicted gasifier performance under additional operating conditions, expanded from the standard condition of the original design. Vamvuka and Woodburn also simulated gasifier performance at operating conditions similar to the Texaco gasifier, but did not compare their results against experiments [13].…”

Section: Model Prediction and Validationmentioning

confidence: 99%

“…Vamvuka et al, predicted gasifier performance at various operating conditions [12,13]. They used the PFR model for both the gas and the solid phases.…”

Section: Introductionmentioning

confidence: 99%

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One-Dimensional Modeling of an Entrained Coal Gasification Process Using Kinetic Parameters

Hwang

Song

2016

Energies

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A one-dimensional reactor model was developed to simulate the performance of an entrained flow gasifier under various operating conditions. The model combined the plug flow reactor (PFR) model with the well-stirred reactor (WSR) model. Reaction kinetics was considered together with gas diffusion for the solid-phase reactions in the PFR model, while equilibrium was considered for the gas-phase reactions in the WSR model. The differential and algebraic equations of mass balance and energy balance were solved by a robust ODE solver, i.e., an semi-implicit Runge-Kutta method, and by a nonlinear algebraic solver, respectively. The computed gasifier performance was validated against experimental data from the literature. The difference in product gas concentration from the equilibrium model, and the underlying mechanisms were discussed further. The optimal condition was found after parameter studies were made for various operating conditions.

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Section: Gassupporting

confidence: 83%

Section: Gasmentioning

confidence: 82%

“…However, the presence of optimal carbon conversion was not observed in the numerical results of Vamvuka [13].…”

Section: Gasmentioning

confidence: 82%

Section: Model Prediction and Validationmentioning

confidence: 99%

“…Vamvuka et al, predicted gasifier performance at various operating conditions [12,13]. They used the PFR model for both the gas and the solid phases.…”

Section: Introductionmentioning

confidence: 99%

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One-Dimensional Modeling of an Entrained Coal Gasification Process Using Kinetic Parameters

Hwang

Song

2016

Energies

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Two fluid model using kinetic theory for modeling of one‐step hydrogen production gasifier

Lü

Zhang

et al. 2008

AIChE Journal

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in Wiley InterScience (www.interscience.wiley.com).A Two Fluid Model (TFM) using kinetic theory of granular flow has been developed to describe an innovative process of hydrogen production in a single step. An extended Multi-species of Solid Phase (MSP) method is proposed to simulate the gas-solid heterogeneous reactions in an entrained flow gasifier, as opposed to Single-species of Solid Phase (SSP) in previous studies. The intrinsic equations of methane steam reforming and water-gas shift reactions are used for a good understanding of the reaction mechanism for high concentration of hydrogen production under higher pressure. On the basis of the results of computing, the main feature of core-annular reaction zone is predicted in the fully developed flow region. And the similar flame-like structure for velocity and temperature is observed to emerge from the feed injection zone at the bottom of gasifier. The model well illustrates the effects of CaO on enhancing the concentration of hydrogen and sequestering CO 2 in the process of coal gasification. The advantages of pressure gasification are also shown that coal conversion increases with increasing pressure while H 2 S concentration and tar content decreases. Moreover, there is a steep increase in H 2 S and tar species initiated from the entrance of gasifier and then a decrease at the next section. The model shows good agreement with the measurements of flow field and gas products concentration in laboratory-scale plants.

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Petroleum coke gasification: A review

et al. 2013

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The production of petroleum coke (petcoke) in the refineries is progressively peaking up because of the trend of processing heavy crudes and in turn, a renewed interest in delayed coking process. Therefore, an efficient, economical, and environmentally safe utilisation of petcoke has become imperative in the current petroleum refining scenario. Gasification of petcoke has emerged as one of the attractive options and is gaining increasing attention to convert the petcoke to value‐added products. The process offers the refiners a variety of product slates mainly via synthesis gas route. The products include steam, hydrogen, electricity, chemicals (viz. methanol, ammonia, etc.), liquid fuels via Fischer–Tropsch (F‐T) synthesis and so on. Petcoke has been identified as a potential feedstock for about 15% of the total planned gasification capacity worldwide. In the present communication, the published literature pertaining to petcoke gasification has been extensively analysed and a state‐of‐the‐art review has been written that includes: (1) the importance of petcoke gasification in the present petroleum refining scenario; (2) petcoke gasification reaction mechanism, kinetics, and typical product profile; (3) parametric sensitivity of the operating variables such as temperature and pressure; (4) various gasifiers for petcoke gasification; (5) modelling efforts on different types of gasifiers and (6) future prospects of petcoke gasification. An attempt has been made to get the afore‐mentioned aspects together in a thematic framework so that the information is available at a glance and is expected to be useful as a single point source to the researchers and practicing refiners.

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Modelling of an entrained flow coal gasifier. 2. Effect of operating conditions on reactor performance

Cited by 24 publications

References 8 publications

One-Dimensional Modeling of an Entrained Coal Gasification Process Using Kinetic Parameters

One-Dimensional Modeling of an Entrained Coal Gasification Process Using Kinetic Parameters

Two fluid model using kinetic theory for modeling of one‐step hydrogen production gasifier

Petroleum coke gasification: A review

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