A critical review on sustainable biochar system through gasification: Energy and environmental applications

You, Siming; Ok, Yong Sik; Chen, Season S.; Tsang, Daniel C.W.; Kwon, Eilhann E.; Lee, Jechan; Wang, Chi Hwa

doi:10.1016/j.biortech.2017.06.177

Cited by 279 publications

(68 citation statements)

References 110 publications

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“…However, most existing models focus only on the prediction of temperature profile and syngas composition without considering biochar production [7,11,[14][15][16]. Besides syngas, biochar is another valuable product from the gasification process due to its potential ability of improving soil quality and sequestering carbon [17][18][19]. To predict biochar production, the heat and mass transfer on a particle level needs to be considered.…”

Section: Introductionmentioning

confidence: 99%

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

et al. 2018

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Syngas and biochar are two main products from biomass gasification. To facilitate the optimization of the energy efficiency and economic viability of gasification systems, a comprehensive fixed-bed gasification model has been developed to predict the product rate and quality of both biochar and syngas. A coupled transient representative particle and fixbed model was developed to describe the entire fixed-bed in the flow direction of primary air. A three-region approach has been incorporated into the model, which divided the reactor into three regions in terms of different fluid velocity profiles, i.e. natural convection region, mixed convection region, and forced convection region, respectively. The model could provide accurate predictions against experimental data with a deviation generally smaller than 10%. The model is applicable for efficient analysis of fixed-bed biomass gasification under variable operating conditions, such as equivalence ratio, moisture content of feedstock, and air inlet location. The optimal equivalence ratio was found to be 0.25 for maximizing the economic benefits of the gasification process.

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Section: Introductionmentioning

confidence: 99%

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

et al. 2018

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“…Similarly, a combination of higher biochar and higher organic matter appears to be related with charcoal accessibility in soils. Since biochar is very stable in soil, it can directly and long-term modify the soil water holding capacity with its macro porous nature resulting from the cellular composition of the feedstock from which it was derived [21].…”

Section: Impact Of Biochar On Soilmentioning

confidence: 99%

“…It was also observed that a relative increase in temperature causes a relative decrease in N mineralization. In addition, the ratio of fungal PLFA (phospholipid-derived fatty acid) biomarkers to bacteria is also increased in the soil when these biochars are added [21].…”

Section: Impact Of Biochar On Soilmentioning

confidence: 99%

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Role of Biochar Products towards Environmental Management and Technologies: A Brief Review

2018

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Biochar products are not structurally homogenous material but consist of a wide range of heterogeneous elements and chemical structures. This erroneous conception is generally based on the parent material (biomass) and the pyrolysis conditions while covering numerous forms of black carbon. These characteristics lead to a wide spectrum of particle sizes, electrical conductivities, and surface areas among the different products. Biochar products are known to have environmental benefits by connecting the charring biomass to the soil, a step towards environmental management and technology also applied in land administration. Suspected advantages consist of increased soil fertility and crop yield. This paper determines the applicability of biochar products for environmental management and technology, its impacts and effects on soil and soil biota. Various techniques used in the production of biochar are discussed as well as the manufacturing costs on small, medium, and large scales.

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“…During the gasification process, carbonaceous feedstock is converted into fuel gas, hydrocarbons, and a small amount of solid residue (i.e. biochar and ash) in an oxygen-deficient environment (You et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Particulate emission from the gasification and pyrolysis of biomass: Concentration, size distributions, respiratory deposition-based control measure evaluation

Yao

You

Dai

et al. 2018

Environmental Pollution

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Gasification and pyrolysis technologies have been widely employed to produce fuels and chemicals from solid wastes. Rare studies have been conducted to compare the particulate emissions from gasification and pyrolysis, and relevant inhalation exposure assessment is still lacking. In this work, we characterized the particles emitted from the gasification and pyrolysis experiments under different temperatures (500, 600, and 700 °C). The collection efficiencies of existing cyclones were compared based on particle respiratory deposition. Sensitivity analysis was conducted to identify the most effective design parameters. The particles emitted from both gasification and pyrolysis process are mainly in the size range 0.25-1.0 μm and 1.0-2.5 μm. Particle respiratory deposition modelling showed that most particles penetrate deeply into the last stage of the respiratory system. At the nasal breathing mode, particles with sizes ranging from 0.25 to 1.0 μm account for around 91%, 74%, 76%, 90%, 84%, and 79% of the total number of particles that deposit onto the last stage in the cases of 500 °C gasification, 600 °C gasification, 700 °C gasification, 500 °C pyrolysis, 600 °C pyrolysis, and 700 °C pyrolysis, respectively. At the oral breathing mode, particles with sizes ranging from 0.25 to 1.0 μm account for around 92%, 77%, 79%, 91%, 86%, and 81% of the total number of particles that deposit onto the last stage in the six cases, respectively. Sensitivity analysis showed that the particle removal efficiency was found to be most sensitive to the cyclone vortex finder diameter (D). This work could potentially serve as the basis for proposing health protective measures against the particulate pollution from gasification and pyrolysis technologies.

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A critical review on sustainable biochar system through gasification: Energy and environmental applications

Cited by 279 publications

References 110 publications

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

Biomass gasification for syngas and biochar co-production: Energy application and economic evaluation

Role of Biochar Products towards Environmental Management and Technologies: A Brief Review

Particulate emission from the gasification and pyrolysis of biomass: Concentration, size distributions, respiratory deposition-based control measure evaluation

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