Air gasification of digestate and its co-gasification with residual biomass in a pilot scale rotary kiln

Freda, Cesare; Nanna, F.; Villone, A.; Barisano, D.; Brandani, S.; Cornacchia, Giacinto

doi:10.1007/s40095-019-0310-3

Cited by 31 publications

(14 citation statements)

References 31 publications

(40 reference statements)

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“…% (Figure 7). The results of the equilibrium model are in good agreement with experimental data of biomass gasification by air [15,16]. The deviation from experimental results was detected with the methane content in the syngas.…”

Section: Air Gasificationsupporting

confidence: 80%

Thermodynamic Analysis of Biomass Gasification by Different Agents

Freda¹,

Vittoria²,

Fanelli³

et al. 2020

IJES

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Biomass gasification was investigated by a thermodynamic analysis with the scope to understand the effect of the injection of different gasifying agents and of the gasification temperature on the output variables of process. The thermodynamic analysis was carried out by a freeware commercial software. Gasification temperature in the range of 750-950°C, together with different gasification agents air and steam, were investigated. In the case of air process equivalence was varied up to complete combustion of the biomass. For steam gasification the molar steam/biomass ratio was increased up to 9. The investigated output variables of the process were gas yield, heating value and gas composition.

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Section: Air Gasificationsupporting

confidence: 80%

Thermodynamic Analysis of Biomass Gasification by Different Agents

Freda¹,

Vittoria²,

Fanelli³

et al. 2020

IJES

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“…The thermodynamic analysis was carried out by thermodynamic model Soave Redlich-Kwong, setting as syngas the composition of Freda et al [ 15 ] without inert compounds (N 2 , CH 4 ). Only the equilibrium reactor was set in the simulation, and CO 2 flowrate, equilibrium temperature and pressure were varied.…”

Section: Methodsmentioning

confidence: 99%

“…In the syngas derived by digestate, partial pressures of CO, H 2 and CO 2 , consequently, can decrease until 5–10 bar. With a fixed CO flowrate, in the first case the H 2 flowrate followed the same H 2 /CO ratio as that of the raw syngas of Freda et al [ 15 ], 0.87; in the second case, hydrogen was set to have H 2 /CO equal to 2. In order to vary the CO 2 /CO ratio, for both cases the CO 2 flowrate was varied to obtain CO 2 /CO between 0 and 3.…”

Section: Methodsmentioning

confidence: 99%

“…As mentioned before, digestate is a stream derived from municipal solid waste management, which needs to be further valorized, with respect to the actual utilization as feedstock for compost production. Few research works are available in the literature concerning gasification of digestate, although it may be considered a strategy to produce syngas in a sustainable way [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Process Simulation and Environmental Aspects of Dimethyl Ether Production from Digestate-Derived Syngas

Giuliano

Catizzone

Freda

2021

IJERPH

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The production of dimethyl ether from renewables or waste is a promising strategy to push towards a sustainable energy transition of alternative eco-friendly diesel fuel. In this work, we simulate the synthesis of dimethyl ether from a syngas (a mixture of CO, CO2 and H2) produced from gasification of digestate. In particular, a thermodynamic analysis was performed to individuate the best process conditions and syngas conditioning processes to maximize yield to dimethyl etehr (DME). Process simulation was carried out by ChemCAD software, and it was particularly focused on the effect of process conditions of both water gas shift and CO2 absorption by Selexol® on the syngas composition, with a direct influence on DME productivity. The final best flowsheet and the best process conditions were evaluated in terms of CO2 equivalent emissions. Results show direct DME synthesis global yield was higher without the WGS section and with a carbon capture equal to 85%. The final environmental impact was found equal to −113 kgCO2/GJ, demonstrating that DME synthesis from digestate may be considered as a suitable strategy for carbon dioxide recycling.

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“…Mathematical models of gasification processes under the influence of solar radiation are proposed in [53][54][55][56][57][58]. Allothermal processes of biomass pyrolysis and gasification were investigated in [59][60][61][62][63][64][65][66][67], including those in a staged gasification unit [68,69]. Schemes with the heat recirculation of the produced gas were proposed in [70].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fuel and Steam Consumption on Characteristics of Fixed Bed Process of Woody Biomass Steam Gasification with Intensive Heat Supply

Donskoy

2021

Energy Systems Research

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Plant biomass is one of the most widespread renewable energy sources. Energy utilization of biomass allows solving some problems associated with the development of off-grid energy systems and the processing of combustible waste (primarily agricultural and forestry waste). This paper is devoted to the study of an allothermal gasification process of plant biomass materials using a kinetic-thermodynamic model developed by the author. The gasification process is considered stationary, and steam is used as a gasification agent. The power of the supplied heat is considered constant (10 kW). One of the significant tasks related to allothermal gasification is to choose flowrate parameters so that the heat supplied is efficiently used in chemical reactions without the threat of reactor overheating. The determination of the boundaries of the safe gasifier operation involved variant calculations with a view to optimizing the gasification conditions. The calculation results show that the allothermal gasification process can proceed with a thermochemical efficiency of about 70%. For each fixed fuel consumption level, there is an optimal fuel-steam ratio. The complete conversion of biomass requires sufficiently high temperatures. The produced gas contains a significant steam fraction (>50 vol%) even under optimal conditions. The calculated fraction of hydrogen in dry gas is up to 60vol%. The data obtained can be used to assess the efficiency of energy units with biomass gasification using high-temperature sources, for example, in systems that use and store solar thermal energy.

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Air gasification of digestate and its co-gasification with residual biomass in a pilot scale rotary kiln

Cited by 31 publications

References 31 publications

Thermodynamic Analysis of Biomass Gasification by Different Agents

Thermodynamic Analysis of Biomass Gasification by Different Agents

Process Simulation and Environmental Aspects of Dimethyl Ether Production from Digestate-Derived Syngas

The Influence of Fuel and Steam Consumption on Characteristics of Fixed Bed Process of Woody Biomass Steam Gasification with Intensive Heat Supply

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