Simulation of Steam Gasification in a Fluidized Bed Reactor with Energy Self-Sufficient Condition

Suwatthikul, Ajaree; Limprachaya, Siripong; Kittisupakorn, Paisan; Mujtaba, Iqbal M.

doi:10.3390/en10030314

Cited by 33 publications

(18 citation statements)

References 22 publications

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“…Char, ash, and carbon content divided after decomposition of biomass are mixed with the products of volatile Gibbs reactions along with superheated air, which is the gasifier agent. 84 Biomass gasification comprises a very complex mechanism that involves the development of several chemical reactions. Equations 1 – 8 show the main reactions related to this system.…”

Section: Methodsmentioning

confidence: 99%

Process Analysis of Hydrogen Production via Biomass Gasification under Computer-Aided Safety and Environmental Assessments

2020

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The growing awareness to advance new ways to transform renewable materials for producing clean fuels, under technical and sustainable viability, is evident. In this regard, hydrogen arises as one of the cleanest and energetic biofuels in the market. This work addresses the modeling and evaluation of a biomass gasification topology employing process simulation along with an environmental and inherent safety analysis. The presented pathway considered two renewable raw materials (cassava and rice waste) based on their vast availability in north Colombia regions. We employed Aspen Plus process simulation software to model the process, setting biomasses (and ash content) as nonconventional solids in the software and inclusion of FORTRAN subroutines for handling solid properties. Otherwise, the environmental evaluation was performed applying the waste reduction algorithm (WAR). At the same time, safety assessment involves a comprehensive approach based on the inherent safety index (ISI) and the process route index (PRI) methods. Data generated from the implementation of rigorous process simulation of biomass gasification allowed us to determine the needed aspect for performing process analysis methodologies. Results revealed that this topology generates a total flow of 3944.51 kg/h with more than 97% vol of H 2 , from the sustainable use of 19,243 kg/h of cassava waste and 15,000 kg/h of rice straw. From the environmental viewpoint, the process showed moderately to a high overall rate of potential environmental impacts (PEIs), with a higher contribution from process sources than energy sources. It indicates that most of the generated impacts would come from self-operation than from the energy supply generation. In the case of process safety, the topology obtained an ISI score of 35, which represents that modeled gasification would operate below 50% of the expected neutral standard for a physical–chemical process. Complementing the safety evaluation, the obtained PRI suggests that compared to other processes, the analyzed topology shows relatively adequate performance considering the nature of this type of process.

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Section: Methodsmentioning

confidence: 99%

Process Analysis of Hydrogen Production via Biomass Gasification under Computer-Aided Safety and Environmental Assessments

2020

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“…A validated Aspen plus model gave an optimal operating temperature of 911°C, equivalence ratio of 0.18 and STBR of 1.78 to achieve energy selfsufficient conditions for steam gasification in a fluidized bed reactor. Suwatthikul et al achieved a maximum carbon conversion efficiency of 91.03% (Suwatthikul et al, 2017).…”

Section: Previous Workmentioning

confidence: 99%

Aspen Plus simulation of biomass gasification for different types of biomass

Timsina¹,

Thapa²,

Eikeland³

2020

Linköping Electronic Conference Proceedings

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A steady-state Aspen Plus model was developed for biomass gasification in a fluidized bed reactor. A combination of different Aspen Plus unit operations was used to model the gasification process. The model was used to predict the gasifier performance for different operating conditions like temperature, Steam to Biomass Ratio (STBR) and biomass loadings. Further, the gas compositions were compared for different types of biomass feed. The gasification reactor is based on Gibbs minimization with restricted equilibrium approach. Hydrogen production was around 50% for all the biomasses while CO production varies from 8% (Pig manure) to 24.5% (Olive residue) at 700°C. H2/CO ratio increases with an increase in STBR for all the biomass and the ratio was the highest for the pig manure and lowest for the olive residue. Olive residue, wood residue and miscanthus gave the H2/CO ratio of 1.5-2.1, which are more suitable as a feedstock in Fischer-Tropsch synthesis depending upon the operating temperature, a catalyst used and other operating conditions. For the wood residue, an increase in temperature increases the H2 and CO production whereas CO2 and CH4 concentration decreases and becomes stable after 700°C. H2 concentration increased from 46 % to 54 % and CO concentration decreases from 30% to 20% with an increase in STBR from 0.6 to 1 for the wood residue.

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“…There is little amount of data allowing to assess the entrainment rate at the dense zone's surface given the complexity of the process and lack of common agreement on which is the dominating process. In general, in models presented in literature [23], [24] approach based on -projection‖ of solids volume fraction from the dense zone is used. This method, in a way, assumes that there is no distinguishable limit between the dense phase and the freeboard zone, which is true in the turbulent and fast fluidizing beds.…”

Section: Elutriation Of Particles From the Fluid Bedmentioning

confidence: 99%

System efficiency analysis of dual interconnected bubbling fluidized bed reactors for solar fuel production

Farooqui¹,

Jaroszuk²,

Ferrero³

et al. 2018

EasyChair Preprints

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Chemical looping syngas production is a two-step syngas fuel production process that produces CO and H2. The process is composed of two fluidized bed reactors (oxidation reaction and reduction reactor), oxygen carriers (metal oxides) circulating between the two reactors. A comprehensive model is developed to simulate the chemical looping water and carbon dioxide splitting in a dual fluidized bed reactors interconnected with redox cycling between these two reactors through metal oxides (non-stoichiometric ceria). An extensive FORTRAN subroutine is developed and hooked into Aspen plus V8.8 to appropriately model the complexities of the bubbling fluidized bed reactor including the reaction kinetics. The model developed has been validated for its hydrodynamics and kinetics level and individual correlation was quantified for its validity. The reduction reactor is supplied with the solar energy that temperature above 1300oC is varied up to 1550oC. The heat to attain this high temperature is achieved with solar beam down tower. The oxidation reactor is supplied with a mixture of CO2 and H2O with different mixture composition combining 60% and remaining N2. The oxidation reactor temperature is varied between 700-1000oC to identify the maximum efficiency achieved. It is found that the maximum efficiency achieved is 67% corresponds to highest temperature difference between the reactors.

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Simulation of Steam Gasification in a Fluidized Bed Reactor with Energy Self-Sufficient Condition

Cited by 33 publications

References 22 publications

Process Analysis of Hydrogen Production via Biomass Gasification under Computer-Aided Safety and Environmental Assessments

Process Analysis of Hydrogen Production via Biomass Gasification under Computer-Aided Safety and Environmental Assessments

Aspen Plus simulation of biomass gasification for different types of biomass

System efficiency analysis of dual interconnected bubbling fluidized bed reactors for solar fuel production

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