Biomass Gasification for District Heating

Biomass gasification is currently a hot research topic. To achieve a high hydrogen content in the product gas, the gasification feedstock used in this study is air‐dried pine woodchips. Experiments are performed in a downdraft gasifier by varying the operation parameters of the particle size (60 mesh, 80 mesh, 100 mesh), temperature point (700, 750, 800, 850, 900°C), and steam‐to‐biomass mass (S/B) ratio (0, 0.7, 1.4, 2.1, 2.8). The main effects of particle size, temperature, and S/B ratio on the composition of the product gas are analyzed to predict the optimal operation parameters of biomass feedstock. For pine woodchip gasification, the optimal particle size is 80 mesh or 0.17 mm, the preferred temperature is 850°C, and the optimal S/B ratio is 1.4. Although there is an error between the experiment and the simulation, the difference is not significant. The Aspen Plus model can provide guidance for the gasification of pine woodchips and can be extended to the gasification of other kinds of biomass.

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“…Similar conclusions were reported in Refs. 23,[25][26][27]29. The fraction of CH 4 decreases by 6.95% as the fraction of CO 2 increases by 5.69%.…”

Section: Effect Of Temperature On the Product Gasmentioning

confidence: 95%

“…However, Refs. indicated that an increase in the gasification temperature led to an increase in the hydrogen yield. Introducing steam into gasification is more favorable for the hydrogen yield than pure air …”

Section: Introductionmentioning

confidence: 99%

Investigation of biomass (pine wood) gasification: Experiments and Aspen Plus simulation

Huang

Jin

2019

Energy Science & Engineering

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“…The economies of many countries are based on agro-industry, a sector that produces a lot of biomass residues that can be used as feedstock for the production of solid, liquid, and gas biofuels via thermochemical or biological gasification processes (Abbasi and Abbasi, 2010;Gírio et al, 2010;Yang et al, 2014;Aslan, 2016;Chen, 2016;Cutz et al, 2016;Joselin Herbert and Unni Krishnan, 2016;Bilgili et al, 2017;Toklu, 2017). Thermochemical processes to produce biofuels under biomass conversion include partial oxidation with pure air or pure oxygen to produce a syngas rich in CO and CH 4 , reforming with steam to produce mixtures of CO 2 and H 2 , partial oxidation and partial reforming with air-steam or oxygen-steam to produce a syngas rich in H 2 , and pure pyrolysis without any oxidizer to produce liquid and gas fuels (Hernandez et al, 2016;Pacioni et al, 2016;Kirsanovs et al, 2017;Li et al, 2017;Sansaniwal et al, 2017b;Tanczuk et al, 2017;Xiao et al, 2017;Zhang and Pang, 2017). Thus, one of the most performed thermochemical processes is coal and biomass air-gasification have been used for a long time to produce syngas with a high heating value (HHV) ranging from 4 to 6 MJ/SATP m 3 (Gordillo and Annamalai, 2010;Sandeep and Dasappa, 2014).…”

Section: Introductionmentioning

confidence: 99%

Experimental Gasification of Coffee Husk Using Pure Oxygen-Steam Blends

2019

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This work discusses results on temperature profile, syngas composition, High Heating Value, and efficiency of a Coffee Husk counter-current fixed-bed gasification process, in which oxygen-steam blends were used as an oxidizing agent. The experimentation was carried out for various Equivalence Ratios (ER) and Steam-Fuel Ratios (SF), whose ranges were [1.6-5.6] and [0.4-0.8], respectively. The results show that increased steam (higher steam fuel ratios) improves the H 2 /CO molar ratio i.e., for a constant ER = 3.7 and SF at 0.4, 0.6, and 0.8, the H 2 /CO ratio was 1.2, 1.4, and 1.8, respectively. Also, the addition of steam tends to increase the syngas Higher Heating Value, which ranged between 7,714 kJ/m 3 at ER = 1.6 and SF = 0.4 and 8,841 kJ/m 3 at ER = 3.2 and SF = 0.8. On the other hand, increased ER (lower oxygen) decreases the Net Cold Gasification Efficiency (CGE NET) which was between 53% at ER = 5.6 and SF = 0.6 and 82% at ER = 1.6 and SF = 0.4. Results were also compared to results published before for gasification of the same biomass but using air-steam mixtures for partial oxidation. This comparison shows that the use of oxygen increases both the temperature profile in the bed and the yield of CO and H 2 contained in the syngas.

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“…PKS enters the gasifier from the belt conveyor and screw feeder. A limited amount of air as a gasifying medium is also added into the gasifier to produce combustible gas with typical composition: 19.5% H2; 22.3% CO; 3.07% CH4; 12.4% CO2; and 3.46% H2O (Kirsanovs et al, 2017). The gas should be cooled to condense the water content and cleaned to remove unwanted particulates by feeding the gas into a water scrubber.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Study of Palm Kernel Shell Gasification for Aggregate Heating in an Asphalt Mixing Plant

Putro

Pranolo

Waluyo

et al. 2020

Int. J. Renew. Energy Dev.

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This study evaluated thermodynamically the performance of conversion of palm kernel shells into combustible gas through gasification technology for aggregate heating in a hot-mixed asphalt production plant by developing a thermodynamic model using licensed Aspen Plus v.11 software. The effects of the equivalence ratio (ER) in the gasification process and the amount of combustion air to combustible gas to attain the required aggregate temperature were investigated. The thermodynamic model showed a good agreement with the experimental results based H2 and CO contain in producer gas which provided by maximum root mean square errors value of 8.82 and 6.42 respectively. Gasification of 30–35 kg of palm kernel shells in a fixed-bed gasifier reactor using air as a gasifying agent at an ER of 0.325–0.350 generated gaseous fuel for heating 1 ton of aggregate to a temperature of 180–200°C with combustion excess air 10%–20%. ©2020. CBIORE-IJRED. All rights reserved

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Biomass Gasification for District Heating

Cited by 17 publications

References 16 publications

Investigation of biomass (pine wood) gasification: Experiments and Aspen Plus simulation

Investigation of biomass (pine wood) gasification: Experiments and Aspen Plus simulation

Experimental Gasification of Coffee Husk Using Pure Oxygen-Steam Blends

Thermodynamic Study of Palm Kernel Shell Gasification for Aggregate Heating in an Asphalt Mixing Plant

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