Wet torrefaction of biomass for high quality solid fuel production: A review

He, Chao; Tang, Chunyan; Li, Chuanhao; Yuan, Jihui; Tran, Khanh-Quang; Bach, Quang‐Vu; Qiu, Rongliang; Yang, Yanhui

doi:10.1016/j.rser.2018.03.097

Cited by 194 publications

(56 citation statements)

References 98 publications

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“…Torrefaction decreases the oxygen content of the solid product. It has been observed that bio-oil obtained from bio-mass pyrolysis is unstable and low industrial use is due to the high oxygen content (He et al, 2018).…”

Section: Hydrothermal Torrefactionmentioning

confidence: 99%

A comprehensive review of renewable energy production from biomass-derived bio-oil

Sharma¹,

Singh²,

Baskar³

et al. 2019

bta

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Renewable energy production has attracted great attention due to public concerns about the depletion of fossil fuels and the growing emphasis on zero carbon emissions. Two main drivers have pushed renewable energy production to the top of the global agenda: climate change and energy security. Biomass is considered to be the only sustainable source of organic carbon on earth and the perfect equivalent to petroleum for the production of bioenergy, biofuels and fine chemicals with net zero carbon emission in a biorefinery. This review focuses on the potential of producing energy from different biomasses and describes technologies such as direct combustion, microwave technology, hydrothermal liquefaction, and fast pyrolysis to convert biomass into bioenergy. Herein, innovative scalable concepts are provided to perform microwave pyrolysis on a larger scale. Current research is mainly focused on the use of catalysts to enhance the process. Various parameters affect the biomass pyrolysis process, properties, and yields of products. These generally include the biomass source, biomass pretreatment (physical, chemical, and biological), the catalyst, the reaction atmosphere, temperature, the heating rate, and the pressure and vapor residence time. The study also shows how various types of reactors affect the bio-oil yield in the presence of a catalyst.

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Section: Hydrothermal Torrefactionmentioning

confidence: 99%

A comprehensive review of renewable energy production from biomass-derived bio-oil

Sharma¹,

Singh²,

Baskar³

et al. 2019

bta

View full text Add to dashboard Cite

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“…Renewable biomass is one of the emerging energy resources with high potentials that can balance CO 2 emissions [3]. Lignocellulosic biomass is currently a major energy source for fossil fuel partial substitution [4][5][6]. Biomass contributes about 10% of the global annual energy production [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…WT is the treatment of biomass with hydrothermal media at 180-260 • C with pressures at 0.9-4.6 MPa, respectively [4,7,20,21]. WT seems to be a promising technology to produce low cost high quality solid biomass fuels from agricultural wastes.…”

Section: Introductionmentioning

confidence: 99%

“…WT produces solid fuels with enhanced properties at comparatively milder conditions with regard to time and temperature [25]. Furthermore, WT was considered to be a low cost and thus cost-effective prefabrication method with promising equipment corrosion-limiting properties and simple operation [4,7]. After All, WT or hydrothermal pretreatment has attracted an interest, being an effective way to convert high moisture biomass [26].…”

Section: Introductionmentioning

confidence: 99%

“…According to He et al [4], issues associated with operating cost, pollutant emissions, re-design of industrially scale reactor, and system integration with downstream applications must be solved in order to make WT environmentally and commercially sustainable. The most critical issues deal with (i) requirements of reactor materials withstanding high temperature, moderate pressure and severe corrosion; (ii) clogging issues caused by inorganic precipitates; (iii) post-treatment of wastewater and downstream application of WT material; and (iv) heat recovery to minimize energy consumption.…”

Section: Introductionmentioning

confidence: 99%

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Acid-Catalyzed Wet Torrefaction for Enhancing the Heating Value of Barley Straw

et al. 2020

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In the present study, the possibility of improving the higher heating value (HHV) of lignocellulosic biomass, especially barley straw, was examined. The research deals with the treatment of barley straw by acid-catalyzed wet torrefaction (ACWT), also called acid hydrolysis, in a batch reactor (autoclave) Parr 4553 3.75 L. In this case, two different simulation approaches were applied: (i) combined severity factor (CSF) and (ii) response surface methodology (RSM) based on Box–Behnken design of experiments (DoE). Sulfuric acid (SA) concentration, temperature and time were the ACWT parameters examined herein. An oxygen bomb calorimeter was used for the HHV measurement. The findings indicated that the composition changes of the straw due to ACWT had a significant effect on the HHV of the pretreated material. In this study, treatment conditions were 10–35 mM SA, 160–200 °C and an isothermal reaction time 0–40 min (preheating period not included in these values). In conclusion, there was a significant increase in the HHV up to 24.3 MJ/kg for the ACWT barley straw, compared to 17.5 MJ/kg for the untreated straw, at optimal conditions of 200 °C for 25 min (isothermal period) and 35 mM SA. This resulted in a 1.39 enhancement factor (EF) and 68% energy yield (EY).

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