Biomass Gasification Processes in Downd raft Fixed Bed Reactors: A Review

Bhavanam, Anjireddy; Sastry, R. C.

doi:10.7763/ijcea.2011.v2.146

Cited by 70 publications

(62 citation statements)

References 41 publications

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“…In addition to the previous reactions that are common in combustion and gasification, hydrogen, steam, and carbon monoxide undergo further reactions as shown below [3,24]:…”

Section: Chemistry Of Gasificationmentioning

confidence: 99%

“…Bhavanam and Sastry [24] provided design procedures for different types of downdraft gasifiers. The gasification reaction in a downdraft gasifier undergoes several steps, starting with drying step at 100°C, followed by pyrolysis step between 200 and 300°C resulting in release of around 70% of biomass weight as volatile matter and tars [16,24].…”

Section: Design Of Downdraft Gasifiersmentioning

confidence: 99%

“…Leung et al [25] proposed a governmental support to accomplish faster steps toward gasification units commercialization. However, all over the world, biomass energy has been widely incorporated in the power generation system; U.S. started partial and full conversion of conventional power plants to biomass [24]. Throughout this chapter, we will discuss the latest trends in agricultural waste gasification.…”

Section: Introductionmentioning

confidence: 99%

“…Yet, it is still difficult to develop a decentralized power generation unit based on biomass energy which can be used to fill the gap in energy needs in rural areas and farms [4]. Technical difficulties prevent further commercialization of gasification units in accordance to lower conversion efficiency [23,24]. Leung et al [25] proposed a governmental support to accomplish faster steps toward gasification units commercialization.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Review of Biomass Thermal Gasification

Hamad¹,

Radwan²,

AshrafAmin³

2017

Biomass Volume Estimation and Valorization for Energy

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Gasification of biomass is one of the most attractive methods for producing hydrogen rich gas. Syngas production from biomass is an attractive solution for energy crisis. The production of energy from biomass reduces the dependence of developing countries on fossil fuels, as ample biomass is available in the developing countries and is renewable. Downdraft gasifiers are fixed bed gasifiers where the gasifying agent and biomass are flowing downwards, developed for high-volatile fuels such as wood or biomass gasification. Cocurrent flow regime throughout the oxidation and reduction zones reduces the tars and particulates in syngas, which will reduce the necessity of complicated cleaning methods compared to updraft gasifiers especially if the gas is used as a burnable gas in a small community. It is important to ensure homogenous distribution of gasifying agent at the downdraft gasifier throat. This chapter presents latest trends in gasification of biomass using downdraft gasification.

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“…In addition to the previous reactions that are common in combustion and gasification, hydrogen, steam, and carbon monoxide undergo further reactions as shown below [3,24]:…”

Section: Chemistry Of Gasificationmentioning

confidence: 99%

Section: Design Of Downdraft Gasifiersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Review of Biomass Thermal Gasification

Hamad¹,

Radwan²,

AshrafAmin³

2017

Biomass Volume Estimation and Valorization for Energy

View full text Add to dashboard Cite

show abstract

“…Detailed description of the model, balance equations and equilibrium modifications, are presented in author's previous study [15]. The following assumptions were applied to perform following calculations:  gasification reactor is assumed to be a moving bed reactor, fed from the top,  waste feed is 1000 kg/h,  the basic amount of air fed into the reactor is calculated based on equivalence ratio typical for biomass gasification [16,17] ER=0.25,  enriched air is assumed to contain up to 35% of oxygen,  nitrogen from air and inorganic substance from is treated as inert and does not influence chemistry of the process,  heat loss of the system is estimated to be equal to 15% of physical enthalpy of products. The reactor itself can be divided into 3 zones: drying, gasification and ash melting.…”

mentioning

confidence: 99%

Simulation analysis of wastes gasification technologies

Stępień

Ściążko²,

Czerski

et al. 2017

E3S Web Conf.

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Abstract. Each year a significant growth in the amount of wastes generated is observed. Due to this fact technologies enabling utilization of wastes are needed. One of the ways to utilizes wastes is thermal conversion. Most widely used technology for thermal conversion is gasification that enables to produce syngas that can be either combusted or directed to further synthesis to produce methanol or liquid fuels. There are several commercially available technologies that enable to gasify wastes. The first part of this study is subjected to general description of waste gasification process. Furthermore the analysis and comparison of commercially available gasification technologies is presented, including their process arrangement, limits and capabilities. Second part of the study is dedicated to the development of thermodynamic model for waste gasification. The model includes three zones of gasification reactors: drying, gasification and eventually ash melting. Modified Gibbs minimization method is used to simulate gasification process. The model is capable of predicting final gas composition as a function of temperature or equivalence ratio. Calculations are performed for a specified average wastes composition and different equivalence ratios of air to discuss its influence on the performance of gasification (temperature of the process and gas composition). Finally the model enables to calculate total energy balance of the process as well as gasification and final gas temperature.

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Flowsheet Modeling and Simulation of Biomass Steam Gasification for Hydrogen Production

et al. 2020

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Hydrogen production from biomass steam gasification is systematically reviewed. Equilibrium modeling and simulation studies using various techniques for effective hydrogen production are presented. Heat integration, economic analysis of the hydrogen production, and systematic design algorithms research publications are overviewed and discussed for energy‐efficient and economic hydrogen production from various biomass feedstocks. Comparison and analysis of the results strongly suggest the viable potential of biomass steam gasification for hydrogen production from small to large scales with applications for thermal heat, power generation, and many other industrial fields.

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Biomass Gasification Processes in Downd raft Fixed Bed Reactors: A Review

Cited by 70 publications

References 41 publications

Review of Biomass Thermal Gasification

Review of Biomass Thermal Gasification

Simulation analysis of wastes gasification technologies

Flowsheet Modeling and Simulation of Biomass Steam Gasification for Hydrogen Production

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