Maximum carrying capacity and granular temperature of A, B and C particles

Gidaspow, Dimitri; Mostofi, Reza

doi:10.1002/aic.690490404

Cited by 25 publications

(12 citation statements)

References 26 publications

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“…According to Geldart classification, Geldart B particles were used in Tartan's riser, and Geldart A particles were used in Lin's gasifier. Gidaspow 68 presented an approximate analyti- Figure 9. Effect of operating pressure on total gas mass flow rate.…”

Section: Prediction Of Entrained Flow Coal Gasifiermentioning

confidence: 43%

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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Section: Prediction Of Entrained Flow Coal Gasifiermentioning

confidence: 43%

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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“…Verloop and Heertjes (1974) were the first to derive such an expression. Gidaspow and Mostofi (2003) corrected it for the effect of bed density.…”

Section: Power Spectrummentioning

confidence: 46%

Computation of turbulence and dispersion of cork in the NETL riser

Jiradilok

Gidaspow

Breault

et al. 2008

Chemical Engineering Science

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“…The interesting fact about this very complex dynamics is that, for all the simulated bed heights ͑5 Ͻ N Ͻ 200͒, the bed free surface and though the fluid pressure fluctuations frequency follow the same scaling law f ϰ N − , with 0.468Ͻ Ͻ 0.69, and that this law is also valid for 2-D/3-D bubbling beds. [34][35][36][37][38][39][40] This suggests that plane porosity waves and bubbles are of the same nature despite their topological differences. An observation that strengthens this point of view comes from deep slugging beds.…”

Section: From Sfb To Deep Bedsmentioning

confidence: 99%

Local and global dynamics of shallow gas-fluidized beds

2006

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Shallow fluidized beds ͑SFB͒ are studied in this paper as a paradigm for deep fluidized beds. We take advantage of their much simpler behavior to analyze their dynamics with a one-dimensional Eulerian-Lagrangian model. After a validation with available experiments, we examine how particle-scale collisional and hydrodynamic phenomena combine to produce the overall dynamics of SFB. Characteristic times governing the particle's motion are evidenced and the coupling with the fluid is also examined. As a perspective to this work we finally discuss the implications of the SFB dynamics for deep beds. We show that despite the severe simplifications, the model is able to reproduce the temporal dynamics of deep beds and that the internal structuring of SFB is similar in nature to bubbling beds.

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Maximum carrying capacity and granular temperature of A, B and C particles

Cited by 25 publications

References 26 publications

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

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

Computation of turbulence and dispersion of cork in the NETL riser

Local and global dynamics of shallow gas-fluidized beds

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