Modeling Performance of High-Temperature Biomass Gasification Process

Mhilu, Cuthbert F.

doi:10.5402/2012/437186

Cited by 16 publications

(9 citation statements)

References 9 publications

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“…Mhilu [ 5 ] has derived a thermodynamic equilibrium model to predict the main product gas composition CO, CO 2 , H 2 , and CH 4 for gasification of different biomass materials. The gasification regime is investigated at temperatures ranging from 800 K to 1400 K and at equivalence ratio (ER) values between 0.3 and 0.4.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics Analysis of Refinery Sludge Gasification in Adiabatic Updraft Gasifier

Ahmed

Sinnathambi

Eldmerdash

et al. 2014

The Scientific World Journal

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Limited information is available about the thermodynamic evaluation for biomass gasification process using updraft gasifier. Therefore, to minimize errors, the gasification of dry refinery sludge (DRS) is carried out in adiabatic system at atmospheric pressure under ambient air conditions. The objectives of this paper are to investigate the physical and chemical energy and exergy of product gas at different equivalent ratios (ER). It will also be used to determine whether the cold gas, exergy, and energy efficiencies of gases may be maximized by using secondary air injected to gasification zone under various ratios (0, 0.5, 1, and 1.5) at optimum ER of 0.195. From the results obtained, it is indicated that the chemical energy and exergy of producer gas are magnified by 5 and 10 times higher than their corresponding physical values, respectively. The cold gas, energy, and exergy efficiencies of DRS gasification are in the ranges of 22.9–55.5%, 43.7–72.4%, and 42.5–50.4%, respectively. Initially, all 3 efficiencies increase until they reach a maximum at the optimum ER of 0.195; thereafter, they decline with further increase in ER values. The injection of secondary air to gasification zone is also found to increase the cold gas, energy, and exergy efficiencies. A ratio of secondary air to primary air of 0.5 is found to be the optimum ratio for all 3 efficiencies to reach the maximum values.

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Section: Introductionmentioning

confidence: 99%

Thermodynamics Analysis of Refinery Sludge Gasification in Adiabatic Updraft Gasifier

Ahmed

Sinnathambi

Eldmerdash

et al. 2014

The Scientific World Journal

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“…In this way, a larger percentage of feedstocks can be converted into syngas. Several studies indicate that the application of preheated airsteam is able to enhance syngas quality and raise the overall energy efficiency of the process [9,10].…”

Section: Introductionmentioning

confidence: 99%

Assessing biomass steam gasification technologies using a multi-purpose model

Sepe

Li²,

Paul

2016

Energy Conversion and Management

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Two advanced steam-gasification technologies of biomass, high temperature steam gasification (HTSG) and solar-assisted steam gasification, have been thermodynamically investigated in this work and compared with both conventional auto-thermal gasification and High Temperature Air and Steam Gasification (HTAG). A multi-phase, multi-physics 1D steady-state model has been built up to predict the biomass gasification performance, efficiency, yield and species of produced syngas at varying gasification methods and input parameters. In particular, heterogeneous and homogenous gasification reactions coupled with a radiative transfer were employed in the solar-assisted steam gasification. The results showed that the solar-assisted steam gasification technology demonstrates its potential to produce high quality syngas (nearly 42% H 2 and 35% CO). Moreover, it upgrades the heating value of the product syngas up to 1.4 times more than the original value, due to the additional solar energy induction. Compared with conventional auto-thermal gasification, it was found that the process efficiency can be improved from 65% to 81% if using the HTAG technology and the content of hydrogen in the syngas increased from 30% to 55% if applying HTSG. The modelling results agree considerably with the reported experimental and modelling data in literature, and also able to return a direct comparison of advantage and disadvantage of each gasification method, in terms of syngas quantity and quality.

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“…While quantifying experimentally the heat losses during the gasification process, it was found a large amount of energy leaving the system, around 85%, regardless of the moisture content. For this reason, it is not desirable to establish a comparison with works developed under the assumptions of the adiabatic reactor and equilibrium modeling [12,19,[41][42][43]. These assumptions lead to an inaccurate syngas yield, since the temperature levels become much higher than reality and sometimes unreal, carrying the Gibbs minimization process to overestimate CO and H 2 and underestimate or even neglect CxHy concentration.…”

Section: Exergy Balancementioning

confidence: 99%

Thermodynamic assessment of human feces gasification: an experimental-based approach

et al. 2019

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Residues with a large amount of organic content represent a potential for energy recovery. Specifically human feces, given the amount of global production and the environmental appeal, appear as a potential candidate for a new feedstock. The objective of this work is to perform a thermodynamic assessment of human feces gasification considering for the first time all inefficiencies of a downdraft gasifier. A thermochemical characterization was conducted from the sterilized raw material to the products. New data and discussions about the conversion efficiencies for such type of fuel are brought up, such as the influence of the exothermic pyrolysis on the chemical exergy destruction. The results suggest an unfavorable application in energetic terms; however, when the exergy analysis is added with the environmental bias, the process becomes more attractive due to the high physical exergy.

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Modeling Performance of High-Temperature Biomass Gasification Process

Cited by 16 publications

References 9 publications

Thermodynamics Analysis of Refinery Sludge Gasification in Adiabatic Updraft Gasifier

Thermodynamics Analysis of Refinery Sludge Gasification in Adiabatic Updraft Gasifier

Assessing biomass steam gasification technologies using a multi-purpose model

Thermodynamic assessment of human feces gasification: an experimental-based approach

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