A steady state model for predicting performance of small-scale up-draft coal gasifiers

Cau, Giorgio; Tola, Vittorio; Pettinau, Alberto

doi:10.1016/j.fuel.2015.03.047

Cited by 27 publications

(7 citation statements)

References 35 publications

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“…In the last few years Sotacarbo gained a wide experience in biomass-and coal-fuelled fixed-bed and fluidized-bed gasification technologies [27][28][29] and recently installed a new pilot-scale 500 kW th BFB gasification unit-named FABER (fluidized air-blown experimental gasification reactor) and commissioned in December 2017-for the experimental development of BFB technology. The unit operates at about atmospheric pressure with air as gasifying agent and, due to its experimental nature, is equipped with several instruments for a careful process analysis.…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Analysis of a Small-Scale Biomass-to-Energy BFB Gasification-Based System

Porcu¹,

Sollai²,

Marotto³

et al. 2019

Energies

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In order to limit global warming to around 1.5–2.0 °C by the end of the 21st century, there is the need to drastically limit the emissions of CO2. This goal can be pursued by promoting the diffusion of advanced technologies for power generation from renewable energy sources. In this field, biomass can play a very important role since, differently from solar and wind, it can be considered a programmable source. This paper reports a techno-economic analysis on the possible commercial application of gasification technologies for small-scale (2 MWe) power generation from biomass. The analysis is based on the preliminary experimental performance of a 500 kWth pilot-scale air-blown bubbling fluidized-bed (BFB) gasification plant, recently installed at the Sotacarbo Research Centre (Italy) and commissioned in December 2017. The analysis confirms that air-blown BFB biomass gasification can be profitable for the applications with low-cost biomass, such as agricultural waste, with a net present value up to about 6 M€ as long as the biomass is provided for free; on the contrary, the technology is not competitive for high-quality biomass (wood chips, as those used for the preliminary experimental tests). In parallel, an analysis of the financial risk was carried out, in order to estimate the probability of a profitable investment if a variation of the key financial parameters occurs. In particular, the analysis shows a probability of 90% of a NPV at 15 years between 1.4 and 5.1 M€ and an IRR between 11.6% and 23.7%.

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Section: Introductionmentioning

confidence: 99%

Techno-Economic Analysis of a Small-Scale Biomass-to-Energy BFB Gasification-Based System

Porcu¹,

Sollai²,

Marotto³

et al. 2019

Energies

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“…Among these technologies, biomass gasification is considered as a reliable conversion technology due to the production of clean syngas for the efficient generation of heat and power while leading to relatively low emissions of pollutant [11,12]. Biomass gasification is a thermochemical conversion process which converts solid biomass feedstock into a mixture of gaseous components including hydrogen (H 2 ), carbon monoxide (CO), carbon dioxide (CO 2 ), and methane (CH 4 ) through partial oxidization [13,14]. In addition to these major products, some minor products such as a nitric oxide (NO), nitrogen dioxide (NO 2 ), water vapors (H 2 O), ammonia (NH 3 ), hydrogen cyanide (HCN), hydrogen sulphide (H 2 S), Energies 2020, 13, 5668 2 of 17 sulphur dioxide (SO 2 ), and sulphur trioxide (SO 3 ) may also be observed as well as some amount of tar and char [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Biomass to Syngas: Modified Non-Stoichiometric Thermodynamic Models for the Downdraft Biomass Gasification

2020

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Biomass gasification is the most reliable thermochemical conversion technology for the conversion of biomass into gaseous fuels such as H2, CO, and CH4. The performance of a gasification process can be estimated using thermodynamic equilibrium models. This type of model generally assumes the system reaches equilibrium, while in reality the system may only approach equilibrium leading to some errors between experimental and model results. In this study non-stoichiometric equilibrium models are modified and improved with correction factors inserted into the design equations so that when the Gibbs free energy is minimized model predictions will more closely match experimental values. The equilibrium models are implemented in MatLab and optimized based on experimental values from the literature using the optimization toolbox. The modified non-stoichiometric models are shown to be more accurate than unmodified models based on the calculated root mean square error values. These models can be applied for various types of solid biomass for the production of syngas through biomass gasification processes such as wood, agricultural, and crop residues.

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“…Process simulation plays an important role in the development of new technologies in the processes of design and optimization. [11,12] Numerous simulation works have been carried out to investigate gasification processes in entrained beds, [12][13][14] fixed beds, [15][16][17] and fluidized beds. [18][19][20][21] These works focused mainly on understanding effects of process parameters such as temperature, equivalence ratio (ER), and steam to coal ratio (S/C) on the gasification performance commonly characterized by the composition and lower heating value (LHV) of the produced gas, carbon conversion, cold gas efficiency (CGE), and thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

Process analysis of a two‐stage fluidized bed gasification system with and without pre‐drying of high‐water content coal

Han

Wang

et al. 2020

Can J Chem Eng

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In order to investigate the gasification performance of coal with high water content, a two‐stage fluidized bed gasification (TSFBG) system was systematically simulated by Aspen Plus to identify the effect of pre‐drying for coal with its initial water content varying from 10‐65 wt% on gasification performance, particularly energy efficiency. The results show that the energy efficiency based on lower heating value (LHV) (ηLHV) and higher heating value (HHV) (ηHHV) of feed coal are about 1.5%‐7% and 1.5%‐5% higher when coal is fed to the system directly without pre‐drying. For the TSFBG system, the higher the water content, the greater the energy efficiency reduction by pre‐drying. The analysis of energy allocations reveals that heat loss due to the pre‐drying of coal is mainly responsible for the decrease of energy efficiency in operations with pre‐drying. With an increase in the initial water content from 10 to 65 wt%, the ηLHV of the TSFBG system without the pre‐drying of coal using air/steam as gasification agent reaches its maximum of about 91% at an initial water content of 26 wt%. The ηLHV and ηHHV of the TSFBG system using oxygen/steam as gasification agent increases energy efficiency by about 1%‐2% compared to that using air/steam. For TSFBG using air/steam to gasify coal without the pre‐drying, the preferred initial water content of coal is below 50 wt%.

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A steady state model for predicting performance of small-scale up-draft coal gasifiers

Cited by 27 publications

References 35 publications

Techno-Economic Analysis of a Small-Scale Biomass-to-Energy BFB Gasification-Based System

Techno-Economic Analysis of a Small-Scale Biomass-to-Energy BFB Gasification-Based System

Biomass to Syngas: Modified Non-Stoichiometric Thermodynamic Models for the Downdraft Biomass Gasification

Process analysis of a two‐stage fluidized bed gasification system with and without pre‐drying of high‐water content coal

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