High-Temperature Air/Steam-Blown Gasification of Coal in a Pressurized Spout-Fluid Bed

Xiao, Rui; Zhang, Mingyao; Jin, Baosheng; Huang, Yaji; Zhou, Hang

doi:10.1021/ef050233h

Cited by 173 publications

(83 citation statements)

References 21 publications

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“…Gaseous emissions were measured and recorded by means of gas analyzers and suitable software, and the results were used to calculate the gas yield (η gas ) [16] by applying a balance to the inert gas (N 2 ) that came into the reactor as part of the air, the HHV of the syngas obtained [41], measured in kJ/Nm 3 , and the cold-gas efficiency [42]:…”

Section: Biomass Characterizationmentioning

confidence: 99%

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

et al. 2017

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Investigation into clean energies has been focused on finding an alternative to fossil fuels in order to reduce global warming while at the same time satisfying the world's energy needs. Biomass gasification is seen as a promising thermochemical conversion technology as it allows useful gaseous products to be obtained from low-energy-density solid fuels. Air-steam mixtures are the most commonly used gasification agents. The gasification performances of several biomass samples and their mixtures were compared. One softwood (pine) and one hardwood (chestnut), their torrefied counterparts, and other Spanish-based biomass wastes such as almond shell, olive stone, grape and olive pomaces or cocoa shell were tested, and their behaviors at several different stoichiometric ratios (SR) and steam/air ratios (S/A) were compared. The optimum SR was found to be in the 0.2-0.3 range for S/A = 75/25. At these conditions a syngas stream with 35% of H 2 + CO and a gas yield of 2 L gas/g fuel were obtained, which represents a cold-gas efficiency of almost 50%. The torrefaction process does not significantly affect the quality of the product syngas. Some of the obtained chars were analyzed to assess their use as precursors for catalysts, combustion fuel or for agricultural purposes such as soil amendment.

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Section: Biomass Characterizationmentioning

confidence: 99%

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

et al. 2017

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“…4) There is no specific trend followed when superficial velocity is varied and diameter of rice husk particle is kept same; it may increase or decrease as observed. …”

Section: Discussionmentioning

confidence: 90%

“…The region near the fuel inlet shows a particularly concentrated region for the gaseous species of CO, H 2 and CH 4 . This region signifies the accumulation of devolatilisation products as the fuel is introduced to the bed at this point.…”

Section: Resultsmentioning

confidence: 99%

“…The previous studies by Ravi Inder Singh [2], 2010, developed the mathematical model for minimum fluidization velocity, causes of agglomeration and visualization of flow pattern; K G Mansaray et al [3], 2000, developed the model that was based on material balance, energy balance, and chemical equilibrium relations. A CFD model for fluidized bed biomass gasifier is developed and the simulations are carried out to obtain the optimal condition for production of hydrogen rich gas (Zhou et al, [4], 2006). A non-premixed combustion model was used for biomass air-steam gasification in the gasifier.…”

Section: Introductionmentioning

confidence: 99%

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CFD Analysis on Fluidized Bed Gasification of Rice Husk and Rice Straw

Singh¹,

Srivastava²

2017

OALib

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In the work being presented, computational fluid dynamics (CFD) analysis on fluidized bed gasification of rice husk has been carried out. The multiphase Eulerian model was undertaken in the analysis. Due to the lack of computational space, two dimensional models of fluidized bed were created. The objective of the investigation was to study the effect of variation on velocity with varying particle sizes. The quality of synthesis gas was also taken into account. The inlet's superficial velocity was varied from 0.2 m/s to 1.2 m/s and diameter of rice husk varied from 0.0438 mm to 4.38 mm. Based on obtained results, this may be concluded that minimum fluidization velocity decreases with increase in diameter of rice husk. The carbon conversion was found to be maximum for 0.7 m/s velocity and carbon conversion increased for other velocities up to 96.9%. The analysis was carried out using ANSYS FLUENT 14.0 non-commercial code. Subject AreasMechanical Engineering

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“…of which H 2 %, CO% and CH 4 % are the volumetric percentage of the component gases in the flue gas (Xiao, Zhang, Jin, Huang, & Zhou, 2006). Table 2 shows the average compositions and the HHV of the resulting syngas for the feedstock materials.…”

Section: Methodsmentioning

confidence: 99%

On the Diversification of Feedstock in Gasification of Oil Palm Fronds

Sulaiman¹,

Razali²,

Konda³

et al. 2014

J MECH ENG SCI

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Co-gasification of biomass can be beneficial since relying on only one type of biomass can interrupt operations if the supply of feedstock is disrupted for any reason. Despite this a gasifier system is usually designed for operation with only one specific feedstock. The gasifying of different biomasses can lead to failure or inefficiency. In this work the gasification of different forms of feedstock derived from oil palm frond was tested in an updraft gasifier that was specially designed for oil palm fronds. The feedstocks considered were dried frond blocks, briquetted fronds and overdried (at 150°C) frond blocks. The air flow rate was maintained to the value set for dried fronds in order to investigate the robustness of such configurations. The resulting syngas from the gasification was analyzed in terms of the composition of combustible gases and higher heating value (HHV). Overall, it was found that the altered forms of feedstock caused degradation in the syngas quality, which resulted in a decrease in the HHV of up to 65%.

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High-Temperature Air/Steam-Blown Gasification of Coal in a Pressurized Spout-Fluid Bed

Cited by 173 publications

References 21 publications

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

Optimization of a Bubbling Fluidized Bed Plant for Low-Temperature Gasification of Biomass

CFD Analysis on Fluidized Bed Gasification of Rice Husk and Rice Straw

On the Diversification of Feedstock in Gasification of Oil Palm Fronds

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