Hydrogen from Coal in a Single Step

Mondal, Kanchan; Piotrowski, Krzystof; Dasgupta, Debalina; Hippo, E.J.; Wiltowski, Tomasz

doi:10.1021/ie048974d

Cited by 40 publications

(34 citation statements)

References 31 publications

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“…This is because water-gas shift reaction is not pressure dependent and methane steam reforming reactions is favored by low pressure. 4 Therefore, the corresponding effectiveness factors are set in the homogeneous reactions according to the contribution for Hydrogen production. The values of the effectiveness factors at the operating pressure of 3-6 MPa are derived from the literature.…”

Section: Gasification Model Comparison With Experimentsmentioning

confidence: 99%

“…1 More attention has been paid to the process of hydrogen production from coal in a single step, [2][3][4] which combines the water gas shift reaction and reforming reactions with gasification in one reactor. This process can also be extended to biomass gasification and some excellent catalysts has been developed to accelerate a process of hydrogen and syngas production at very low temperature.…”

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confidence: 99%

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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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Section: Gasification Model Comparison With Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

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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“…Regarding method (3) the operation parameters, such as gasifying agent, temperature and residence time, are key factors in the formation and decomposition of tar. Tar can be thermally cracked at temperature above 1273 K. In the type (2) method, the use of additives (type such as dolomite, olivine and even char), also facilitate tar reduction (Kuznetsov & Shchipko, 1996;Mondal, Piotrowski, Dasgupta, Hippo, & Wiltowski, 2005;Orio, Corella, & Narvaez, 1997). Dolomite is particularly suited because 100% elimination of tar can be achieved with this additive.…”

Section: Gasification Of Coal and Heavy Hydrocarbonsmentioning

confidence: 99%

Introduction to hydrogen production

Navarro¹,

Guil²,

Fierro³

2015

Compendium of Hydrogen Energy

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“…In one such study, the coal is gasified in the presence of an oxygen carrier (Fe 2 O 3 ) and a CO 2 removal agent (CaO). In addition to the water gas shift reaction the oxygen carrier oxidizes the CO to form more CO 2 which is removed by the CaO sorbent (Mondal, 2005).…”

Section: Calcium Assisted Hydrogen Productionmentioning

confidence: 99%

Enhanced Hydrogen Production Integrated with CO2 Separation in a Single-Stage Reactor

Ramkumar¹,

Iyer²,

Wong³

et al. 2008

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High purity hydrogen is commercially produced from syngas by the Water Gas Shift Reaction (WGSR) in high and low temperature shift reactors using iron oxide and copper catalysts respectively. However, the WGSR is thermodynamically limited at high temperatures towards hydrogen production necessitating excess steam addition and catalytic operation. In the calcium looping process, the equilibrium limited WGSR is driven forward by the incessant removal of CO 2 by-product through the carbonation of calcium oxide. At high pressures, this process obviates the need for a catalyst and excess steam requirement, thereby removing the costs related to the procurement and deactivation of the catalyst and steam generation. Thermodynamic analysis for the combined WGS and carbonation reaction was conducted. The combined WGS and carbonation reaction was investigated at varying pressures, temperatures and S/C ratios using a bench scale reactor system. It was found that the purity of hydrogen increases with the increase in pressure and at a pressure of 300 psig, almost 100% hydrogen is produced. It was also found that at high pressures, high purity hydrogen can be produced using stoichiometric quantities of steam. On comparing the catalytic and non catalytic modes of operation in the presence of calcium oxide, it was found that there was no difference in the purity of hydrogen produced at elevated pressures. Multicyclic reaction and regeneration experiments were also conducted and it was found that the purity of hydrogen remains almost constant after a few cycles. 1

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Hydrogen from Coal in a Single Step

Cited by 40 publications

References 31 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

Introduction to hydrogen production

Enhanced Hydrogen Production Integrated with CO2 Separation in a Single-Stage Reactor

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