System model for gasification of biomass model compounds in supercritical water – A thermodynamic analysis

Withag, J.A.M.; Smeets, Jules R.; Bramer, Eduard A.; Brem, Gerrit

doi:10.1016/j.supflu.2011.10.012

Cited by 70 publications

(47 citation statements)

References 28 publications

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“…In this research, the Soave-Redlich-Kwong with the Twu mixing rule (SRK-Twu) is selected. This method is already tested and the results are similar in comparison to other work related to SCWG process modeling [23].…”

Section: Choice Of Property Methodssupporting

confidence: 60%

“…The current study considers two types of processes that are based on VERENA pilot plant in Germany, the Reference Premixed (RP) system [21] and the DI system [22]. The RP system makes use of premixed biomass and water (both at room temperature) as its feedstream [23] [24]. This mixed stream is preheated using product gas before it enters the reactor.…”

Section: R Yukananto Et Al American Journal Of Analytical Chemistrymentioning

confidence: 99%

“…Therefore, HE effectiveness for recovering heat plays an important role in determining the thermal efficiency of the system. The HE effectiveness is defined as the ratio of the actual heat transferred by the HE and the maximum heat that could possibly be transferred from one stream to the other [23]. During the SCWG process, the specific heat capacity of water can change dramatically.…”

Section: Performance Indicatorsmentioning

confidence: 99%

See 2 more Smart Citations

An Energy Analysis on Gasification of Sewage Sludge by a Direct Injection in Supercritical Water

Yukananto¹,

Louwes²,

Bramer³

et al. 2017

AJAC

Self Cite

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Supercritical Water Gasification is an efficient technology in converting wet biomass into H 2 and CH 4 in comparison to other conventional thermochemical processes. Coke deposition, however, remains as a major challenge in this technology. Coke formation is the result of polymerization reactions that take place at sub-critical conditions. Directly injecting the relatively unheated wet biomass feed into supercritical water increases the heating rate and reduces the residence time of the feed in the sub-critical condition. This leads to a minimized coke formation in the process. However, a non-isothermal mixing takes place during this direct injection that is less energy-efficient. In addition, the biomass feedstream experiences less pre-heating that means less heat recovery from the product gas. These two aspects might reduce the overall process performance. Parametric studies of key operating parameters, such as operating temperature, dry matter content, bypass water ratio and heat exchanger effectiveness, are carried out to investigate the influence of direct injection to the thermal efficiency of the system. Subsequently, optimization using pinch analysis is conducted to the system with direct injection. Finally, an operating window for optimum performance of the optimized direct injection gasification system is proposed.

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Section: Choice Of Property Methodssupporting

confidence: 60%

Section: R Yukananto Et Al American Journal Of Analytical Chemistrymentioning

confidence: 99%

Section: Performance Indicatorsmentioning

confidence: 99%

See 1 more Smart Citation

An Energy Analysis on Gasification of Sewage Sludge by a Direct Injection in Supercritical Water

Yukananto¹,

Louwes²,

Bramer³

et al. 2017

AJAC

Self Cite

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show abstract

“…This value is around 1.5 MJ·( kg-total-feed) −1 for a reactor operating at 700 °C with the same process conditions. Another process simulation concerning a system model based on methanol gasification has been performed by Withag et al [135]. Here, the authors also used AspenPlus TM and tested the validity of different EoS concluding that the property methods based on the Peng-Robinson and Soave Redlich-Kwong EoS all give a prediction of the H2 mole fraction within a bandwidth of 3.5% compared to experimental results.…”

Section: Process Modelingmentioning

confidence: 99%

Supercritical Water Gasification of Biomass: A Literature and Technology Overview

Yakaboylu

Harinck

Smit³

et al. 2015

Energies

183

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Abstract:The supercritical water gasification process is an alternative to both conventional gasification as well as anaerobic digestion as it does not require drying and the process takes place at much shorter residence times; a few minutes at most. The drastic changes in the thermo-physical properties of water from the liquid state to the supercritical state make it a promising technology for the efficient conversion of wet biomass into a product gas that after upgrading can be used as substitute natural gas. The earliest research goes back as far as the 1970s and since then, supercritical water has been the subject of many research works in the field of thermochemical conversion of wet biomass. This article reviews the state of the art of the supercritical water gasification technology starting from the thermophysical properties of water and the chemistry of reactions to the process challenges of such a biomass based supercritical water gasification process plant.

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“…Some research in this area has been done by researchers. Whitag et al presented a system model for the process of gasification of biomass model compounds in SCW media and predicted the influence of some parameters on the molar fraction of gaseous components and thermal efficiency (Whitag et al 2012). Fiori et al proposed a conceptual process design for a hydrogen production plant based on SCW gasification.…”

Section: Introductionmentioning

confidence: 99%

Gasification of sugarcane bagasse in supercritical water media for combined hydrogen and power production: a novel approach

Safari

Tavasoli

Ataei

2016

Int. J. Environ. Sci. Technol.

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A novel process based on supercritical water gasification has been used in this study for co-production of hydrogen and power from sugarcane bagasse as one of the main agricultural wastes of Iran. The cycle of the process was designed first, and then, the thermodynamic equilibrium model of the gasification process was simulated using ASPEN PLUS. The effects of temperature and feed concentration on molar fraction of main components of produced gas were investigated. The temperature was directly correlated with hydrogen production in which hydrogen and carbon monoxide production was favored at higher temperatures. The maximum hydrogen production occurred in the sugarcane bagasse concentrations about 20-30 wt%. Palladium membrane as a metallic dense membrane was used for separation of highpurity hydrogen. Hydrogen production of 8.55 kg/h and electrical power generation of 56 kW were obtained for the 20 wt% mixture of bagasse with a mass flow rate of 1000 kg/ h, reactor pressure of 300 bars and temperature of 700°C.

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System model for gasification of biomass model compounds in supercritical water – A thermodynamic analysis

Cited by 70 publications

References 28 publications

An Energy Analysis on Gasification of Sewage Sludge by a Direct Injection in Supercritical Water

An Energy Analysis on Gasification of Sewage Sludge by a Direct Injection in Supercritical Water

Supercritical Water Gasification of Biomass: A Literature and Technology Overview

Gasification of sugarcane bagasse in supercritical water media for combined hydrogen and power production: a novel approach

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