Modelling of a pressurised entrained flow coal gasifier: the effect of reaction kinetics and char structure

Liu, G.-S; Rezaei, Hamid; Lucas, John; Harris, David; Wall, Terry

doi:10.1016/s0016-2361(00)00037-5

Cited by 88 publications

(59 citation statements)

References 33 publications

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“…5,10,11 It has been found that chars with different structures may behave differently during subsequent combustion. 12 However, the reactivity of chars obtained at high pressure under steam gasification has scarcely been studied. 13 Thermogravimetric analysis (TGA) is a useful, simple, and fast tool for investigating and comparing thermal behavior, reactivity, and kinetics parameters during the pyrolysis, combustion, and gasification of carbonaceous materials.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Parameters and Reactivity for the Steam Gasification of Coal Chars Obtained under Different Pyrolysis Temperatures and Pressures

et al. 2011

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The effect of devolatilization conditions (pressure and temperature) on the steam gasification kinetics and reactivity of coal chars was investigated. For this purpose, five different rank coals were selected: a lignite (LT), two high-volatile bituminous coals (DT and SA), a low-volatile bituminous coal (DI), and a semianthracite (HV). The coal chars were obtained by devolatilization in a novel pressurized fixed-bed reactor at temperatures of 800, 900, and 1000°C and pressures of 1, 5, 10, and 20 atm. The reactivity of the chars was studied by isothermal thermogravimetric analysis in a kinetically controlled regime at different temperatures under a steam atmosphere. The reactive behavior of the chars was evaluated by means of the random pore model (RPM), which satisfactorily described the steam gasification of the coal chars. The gasification apparent reaction rate increased as the devolatilization pressure increased, whereas this parameter decreased as the devolatilization temperature increased.

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Section: Introductionmentioning

confidence: 99%

Kinetic Parameters and Reactivity for the Steam Gasification of Coal Chars Obtained under Different Pyrolysis Temperatures and Pressures

et al. 2011

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“…Vamvuka et al 8,9 assumed the two-phase flow to be one-dimensional with plug flow axially and complete radial mixing, so did Liu et al 10 Fang et al 11 divided the reactor into 80 short cylinder cells, and further divided each cell into four annular regions along the radial. In every annular region, gas and solid flow is assumed to be in plug flow.…”

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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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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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“…Variety of feedstock can be used in PHTW process, ranging from hard coal and brown coal over biomass to mixtures of waste and coal [45]. Entrained bed gasifiers are the most widely used gasifiers with different technologies i.e., BBP (Babcock Borsig Power), Hitachi, MHI (Mitsubishi Heavy Industries), PRENFLO (Pressurized entrained flow), Shell coal gasification process (SCGP), E-Gas and Texaco/GE [13,32,33,[53][54][55][56]. In these gasifiers, coal and other solid fuel particles concurrently react with steam and oxygen or air in suspended (i.e.…”

Section: Componentsmentioning

confidence: 99%

Syngas production through gasification and cleanup for downstream applications — Recent developments

Mondal¹,

Dang²,

Garg³

2011

Fuel Processing Technology

237

104

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Modelling of a pressurised entrained flow coal gasifier: the effect of reaction kinetics and char structure

Cited by 88 publications

References 33 publications

Kinetic Parameters and Reactivity for the Steam Gasification of Coal Chars Obtained under Different Pyrolysis Temperatures and Pressures

Kinetic Parameters and Reactivity for the Steam Gasification of Coal Chars Obtained under Different Pyrolysis Temperatures and Pressures

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

Syngas production through gasification and cleanup for downstream applications — Recent developments

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