Entrained flow gasification of biocoal from hydrothermal carbonization

Tremel, Alexander; Stemann, Jan; Herrmann, Michael; Erlach, Berit; Spliethoff, Hartmut

doi:10.1016/j.fuel.2012.05.024

Cited by 65 publications

(38 citation statements)

References 12 publications

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“…There are also reports that indicate changes in feedstock type have little influence on solids characteristics [48][49][50][51]. The differences in these observations likely depend on the feedstocks that are being evaluated.…”

Section: Influence Of Feedstock Properties On Hc Characteristicsmentioning

confidence: 99%

Hydrothermal Carbonization: Modeling, Final Properties Design and Applications: A Review

et al. 2018

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Active research on biomass hydrothermal carbonization (HTC) continues to demonstrate its advantages over other thermochemical processes, in particular the interesting benefits that are associated with carbonaceous solid products, called hydrochar (HC). The areas of applications of HC range from biofuel to doped porous material for adsorption, energy storage, and catalysis. At the same time, intensive research has been aimed at better elucidating the process mechanisms and kinetics, and how the experimental variables (temperature, time, biomass load, feedstock composition, as well as their interactions) affect the distribution between phases and their composition. This review provides an analysis of the state of the art on HTC, mainly with regard to the effect of variables on the process, the associated kinetics, and the characteristics of the solid phase (HC), as well as some of the more studied applications so far. The focus is on research made over the last five years on these topics.

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Section: Influence Of Feedstock Properties On Hc Characteristicsmentioning

confidence: 99%

Hydrothermal Carbonization: Modeling, Final Properties Design and Applications: A Review

et al. 2018

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“…Recirculation of process water significantly enhances dewatering [57]. A further thermal drying down to a water content of only 7 % is possible using only internal heat [69]. Although most of the HTC literature suggests that hydrochar is a lignitetype fuel, very few examples of combustion behavior of hydrochar are found in the literature.…”

Section: Hydrochar As Solid Fuelmentioning

confidence: 99%

“…Thermal efficiencies can be as low as 30% for raw biomass and as high as 40% for coal [69]. Hydrochar likely falls between the two.…”

Section: Gasification Of Hydrocharmentioning

confidence: 99%

“…For coal gasification, pressurized oxygenblown entrained flow gasification is used [72], due to its syngas quality of high H 2 and CO concentrations and low tar and hydrocarbon content, as well as its short residence time, resulting in compact gasifier equipment compared to fluidized bed gasifiers. Entrained gasification is also popular for hydrochar gasification [69,72], but not for raw biomass, which requires a complicated feeding system.…”

Section: Gasification Of Hydrocharmentioning

confidence: 99%

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Hydrothermal Carbonization of Biomass for Energy and Crop Production

Reza¹,

Andert²,

Wirth³

et al. 2014

Applied Bioenergy

299

226

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Hydrothermal carbonization (HTC) is a thermochemical pretreatment process where biomass is treated under hot compressed water to produce hydrochar. Hydrochar is a stable, hydrophobic, friable solid product, which has a fuel value similar to that of lignite coal. Among its other advantages, its capability to handle wet feed makes the HTC process most attractive. The complex reaction chemistry of HTC offers a huge potential for producing a variety of products, from fuel to supercapacitors, from carbon nanospheres to low cost adsorbents, from fertilizers to soil amenders. Hydrochar opens possibilities for replacing coal in existing coal-power plants. Its high surface area and adsorption characteristics make it compatible for use in supercapacitors. Hydrochar also contains high amounts of stable carbon and other nutrients, which are essential for soil amendment. Moreover, the HTC process liquid, especially if a short retention time is used, contains potentially toxic substances like phenols, furfurals, and their derivatives, which open opportunities for anaerobic digestion to produce biogas. This review paper gives an overview of the HTC process parameters, reactions, and the use of hydrochar for energy and crop production.

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“…Because of its ability to produce more small size and spherical particles compared with that of the raw biomass, the limitation of the entrained flow gasification could be avoided and thereby, increasing the performance of gasifier. For example, Tremel et al (2012) found that the overall gasification efficiency and carbon conversion efficiency of the entrained flow gasifier was observed superior for the smaller (80-160μm) particles torrefied biomass compared with that of the larger (160-250μm) particles. This could help to use the torrefied biomass in the facility of the entrained flow coal gasification without any modifications.…”

Section: Gasificationmentioning

confidence: 99%

A Comprehensive Review on Biomass Torrefaction

Nhuchhen¹,

Basu²,

Acharya³

2014

IJREB

174

143

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Biomass is a versatile energy resource that could be used as a sustainable energy resource in solid, liquid and gaseous form of energy sources. Torrefaction is an emerging thermal biomass pretreatment method that has an ability to reduce the major limitations of biomass such as heterogeneity, lower bulk density, lower energy density, hygroscopic behavior, and fibrous nature. Torrefaction, aiming to produce high quality solid biomass products, is carried out at 200-300 °C in an inert environment at an atmospheric pressure. The removal of volatiles through different decomposition reactions is the basic principle behind the torrefaction process. Torrefaction upgrades biomass quality and alters the combustion behavior, which can be efficiently used in the co-firing power plant. This paper presents a comprehensive review on torrefaction of biomass and their characteristics. Despite of the number of advantages, torrefaction is motivated mainly for thermochemical conversion process because of its ability to increase hydrophobicity, grindability and energy density of biomass. In addition to this, torrefied biomass could be used to replace coal in the metallurgical process, and promoted as an alternative of charcoal.

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Entrained flow gasification of biocoal from hydrothermal carbonization

Cited by 65 publications

References 12 publications

Hydrothermal Carbonization: Modeling, Final Properties Design and Applications: A Review

Hydrothermal Carbonization: Modeling, Final Properties Design and Applications: A Review

Hydrothermal Carbonization of Biomass for Energy and Crop Production

A Comprehensive Review on Biomass Torrefaction

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