Biomass gasification models for downdraft gasifier: A state-of-the-art review

Patra, Tapas Kumar; Sheth, Pratik N.

doi:10.1016/j.rser.2015.05.012

Cited by 273 publications

(159 citation statements)

References 70 publications

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“…This is due to the synergy between the low volatile matter content of torrefied biomass and the cracking of tars in downdraft gasification oxidation and reduction stages; consequently, the tars formation in the global equation is not meaningful (Kuo et al 2014;Patra and Sheth 2015;Gagliano et al 2016).…”

Section: Model Descriptionmentioning

confidence: 99%

“…Additionally, this gasification model does not provide a detailed description of physical and chemical mechanisms inside the gasifier. The results are considered as a general energy information that may assist the exploration of the thermodynamic operational limits of the gasification process (Patra and Sheth 2015). However, to improve the model capacities in this work, the char byproduct is an approach of the carbon conversion efficiency to consider that not all carbon in the solid fuel reacts to produce carbonaceous gases, such as CO, CO2, and CH4.…”

Section: Model Descriptionmentioning

confidence: 99%

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Effect of Torrefied Wood Biomass under an Oxidizing Environment in a Downdraft Gasification Process

Ramos-Carmona

Pérez

2017

BioResources

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The effect of composition and heating value of torrefied biomass under an oxidizing atmosphere at different conditions (180, 210, and 240 °C during 30, 75, and 120 minutes) was studied relative to downdraft gasification performance. An extended model for gasification in thermochemical equilibrium was used to evaluate the effect of pretreated biomasses, fuelto-air equivalence ratio, and char byproduct production on the producer gas composition, reaction temperature, cold gas efficiency (CGE), and the engine fuel quality (EFQ). The model was validated with experimental data, reaching a global relative error of 8.5%. For raw or torrefied biomasses, with regard to char production, the CGE decreases if char increases; this is due to the fact that the process tends to combustion regimes when a lower amount of carbon is involved in the gasification reaction. Otherwise, the CGE and EFQ increase (up to 80% and 2.5 MJ/kg, respectively) if fuel-to-air ratio increases. With regard to the torrefied biomass, it is highlighted that CGE and EFQ increase from 77% to 82% and from 2.2 MJ/kg to 2.5 MJ/kg, respectively, when the torrefaction conditions (temperature and/or time) increase. This behavior is related to the increase of the autothermal zones in the gasification process and due to the higher heating value of torrefied biomass.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Effect of Torrefied Wood Biomass under an Oxidizing Environment in a Downdraft Gasification Process

Ramos-Carmona

Pérez

2017

BioResources

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“…Downdraft Gasifier-Air moves concurrently with the biomass feed entering from the upper part of the gasifier. As shown in Fig 3, [14,15].…”

Section: Types Of Gasifiersmentioning

confidence: 99%

“…The major advantage of fluidized bed gasifiers is the uniform temperature profile in the gasification zone created by circulating fluid through fine granular material. Loss of fluidization due to plugging the bed is the major disadvantages of fluidized bed gasifier [15]. 4 (2) Oxidation/Combustion Zone: supplies the energy for the subsequent gasification and pyrolysis reactions.…”

Section: Figure 3 -Updraft and Downdraft Gasifiersmentioning

confidence: 99%

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Production of Syngas from Biomass Using a Downdraft Gasifier

Golpour¹,

Boravelli²,

Smith³

et al. 2017

IJERA

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The role of biomass in energy and fuel production as an alternative to fossil fuel is vitally important considering carbon dioxide production vs. secure energy. Sustainable, renewable and reliable resources of domestically produced biomass together with wind and solar energy are sensible options to support a small-scale power generation to meet local electricity demand plus provide heat for rural development. The present work focuses on: 1. Design, build and operate a vertical downdraft biomass gasifier with tar removal 2. Establishing the optimum operating methodology and parameters to maximize syngas production in biomass gasification through process testing. The one ton per day biomass gasification process unit designed in this work included a downdraft biomass thermochemical conversion gasifier, gas transportation line with tar removal and an enclosed combustion chamber. The reactor used internal heat transfer surfaces to enhance intra-bed heat and mass transfer inside the reactor. Three different woody biomass feedstock including pellets, picks and flakes were examined in this work. Specific results described in this paper include identifying and characterizing the key operating factors (i.e., temperature profile, feed stock carbon/hydrogen mass ratio, and air flow rate) required to optimize reactor yield. To achieve the maximum syngas production yield, experiments carried out using classical experimental design methodology.

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Fixed bed gasification of corn stover biomass fuel: Egypt as a case study

El-Sattar

Kamel

2019

Biofuels Bioprod Bioref

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This paper focuses on the optimal performance of a small tri‐generation power, heat, and cooling plant, which uses corn stover as the feedstock. First, 100 kg h−1 of the corn stover is converted into syngas by the gasification process, using a downdraft fixed‐bed reactor at gasification temperatures reaching 995 °C and with an oxidant–fuel ratio of 1.65. About 243.18 kg h−1 of product gas mass flow with 4.766 MJ kg−1 of calorific value is supplied to an externally fired gas turbine (EFGT) to convert this fuel to electrical power. It is estimated that the EFGT is capable of producing 70.57 kW of electrical power with a high‐temperature heat exchanger efficiency of 75% and a pressure ratio of 4.84 at a turbine inlet temperature of 875 °C. The absorption refrigeration system is used for the cooling process. The cooling power (ℚ eva ) of the absorption cooling system is 130.92 kW with a cooling tower temperature of 15 °C and a system performance coefficient (PC) of 0.6. The recovered heat flow to the generator ( ℚ gen ) and the refrigerating heat flow are 82.62 kWth and 48.83 kWref , respectively, with a circulation ratio of 4.07. For the whole system (gasifier, EFGT, and absorption cooling), the gross electrical efficiency (ηnetEL ) is 21.78% and the net thermal efficiency (ηth ) is 47.43% with a system cooling‐to‐power ratio (CPR) of 1.88. The simulation of this system was conducted using Cycle‐Tempo software. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd

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Biomass gasification models for downdraft gasifier: A state-of-the-art review

Cited by 273 publications

References 70 publications

Effect of Torrefied Wood Biomass under an Oxidizing Environment in a Downdraft Gasification Process

Effect of Torrefied Wood Biomass under an Oxidizing Environment in a Downdraft Gasification Process

Production of Syngas from Biomass Using a Downdraft Gasifier

Fixed bed gasification of corn stover biomass fuel: Egypt as a case study

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