Effect of torrefaction on the properties of rice straw high temperature pyrolysis char: Pore structure, aromaticity and gasification activity

Chen, Handing; Chen, Xueli; Qin, Yueqiang; Wei, Juntao; Liu, Haifeng

doi:10.1016/j.biortech.2016.12.074

Cited by 94 publications

(28 citation statements)

References 47 publications

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“…These results indicated the role of pelletizing process that may help extractives to migrate to the particles surface and so facilitate further removal of volatile and tar cracking. Unlike torrefaction‐only pretreatment that may result in less volatile removal and tar cracking during pyrolysis, resulting in reduction of pore volume and surface area and so reducing the char gasification reactivity …”

Section: Resultsmentioning

confidence: 99%

“…Unlike torrefaction-only pretreatment that may result in less volatile removal and tar cracking during pyrolysis, resulting in reduction of pore volume and surface area and so reducing the char gasification reactivity. 48,49 However, it should be noted that other factors could contribute to the apparent differences in the reactivity. Reactivity can be affected by the char obtained by the secondary reaction, which is partly responsible for the loss of reactivity.…”

Section: Gasification Reactivitymentioning

confidence: 99%

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Influence of torrefaction after densification on the fuel characteristics and the inherited gasification kinetics of Erianthus arundinaceus energy grass

Qadi

Kobayashi

Takeno

2019

Env Prog and Sustain Energy

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In this study, a mixture of breeding lines of Erianthus arundinaceus energy grass was pretreated prior to gasification. Although biomass torrefaction and subsequent pelletizing of torrefied biomass (TOP process) have been studied in details, the torrefaction of pellets (TAP process) still in its infancy. Therefore, samples prepared by TAP, torrefaction‐only and pelletizing‐only were compared in terms of fuel characteristics and gasification kinetics. Results showed that the mass yield decreased with increasing torrefaction temperature, whereas the higher heating value (HHV) continued to increase with temperature, which can be seen in the evolution of O/C and H/C atomic ratios. Tradeoff between mass yield and HHV points to 250°C as the optimum torrefaction temperature, as mass yield above 76% could be achieved. TAP process was superior not only in terms of producing fuel with higher energy density, but also the gasification reactivity was higher than that of torrefied‐only or densified‐only samples, suggesting TAP is promising to be employed within the gasification process. Yet, conducting TAP under higher torrefaction temperatures may weaken the reactivity due to the more release of potassium during pyrolysis. Lastly, gasification kinetics data revealed that the pretreated samples exhibited slightly higher activation energy.

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Section: Resultsmentioning

confidence: 99%

Section: Gasification Reactivitymentioning

confidence: 99%

Influence of torrefaction after densification on the fuel characteristics and the inherited gasification kinetics of Erianthus arundinaceus energy grass

Qadi

Kobayashi

Takeno

2019

Env Prog and Sustain Energy

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“…Table 1. Fuel properties of RH, RS, and wood (data were taken from [23,59,99,102, for RH, from [105,109,112,[119][120][121]125,135,136,145,[156][157][158][159][160][161][162][163][164][165][166][167][168][169][170][171][172][173][174][175] for RS and from [92,110,[176][177][178] Origin of the raw materials can have a significant impact on the inorganic composition of fuel ashes of RH and RS. For instance, as shown in Table 2, RH from Egypt, Cambodia, and Italy was evaluated in the same laboratory with the same measurement techniques [72,98].…”

Section: Fuel Properties Of Rice Husk and Rice Strawmentioning

confidence: 99%

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

et al. 2019

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Utilization of biomass either as a renewable energy source or for the generation of biogenic materials has received considerable interest during the past years. In the case of rice husk (RH) and rice straw (RS) with high silica contents in the fuel ash, these approaches can be combined to produce high-grade biogenic silica with purities >98 wt % from combustion residues. The overall process can be considered nearly neutral in terms of CO2 emission and global warming, but it can also address disposal challenges of rice husk and rice straw. For the resulting biogenic silica, several advanced application opportunities exist, e.g., as adsorbents, catalysts, drug delivery systems, etc. This article provides a comprehensive literature review on rice husk and rice straw combustion as well as applied strategies for raw material pre-treatment and/or post-treatment of resulting ashes to obtain high quality biogenic silica. Purity of up to 97.2 wt % SiO2 can be reached by combustion of untreated material. With appropriate fuel pre-treatment and ash post-treatment, biogenic silica with purity up to 99.7 wt % can be achieved. Studies were performed almost exclusively at a laboratory scale.

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“…Chen et al [15] investigated the release and transformation characteristics of K and Cl during straw torrefaction and mild pyrolysis under different conditions due to the variation of contents and chemical form. Moreover, Chen et al [16] investigated the influence of torrefaction on the physicochemical characteristics of char during raw and water washed rice straw pyrolysis and compared pore structure, aromaticity, and gasification activity of pyrolysis chars between raw and torrefied samples.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of wood pellets mixed with torrefied rice straw as a biomass fuel

Kizuka

Ishii

Sato

et al. 2019

Int J Energy Environ Eng

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Utilization of rice straw as an alternative fuel source to fossil fuel has been considered. However, properties such as water content, low heating value, less grindability, high bulk density, and high ash content are problems in such a biomass fuel supply chain. This study attempted to produce wood pellets mixed with torrefied rice straw (WPTRS) to solve the problems related to using rice straw as fuel. For that, preferred torrefaction conditions, such as torrefaction temperature and holding time, were determined by indicators of the grindability, energy loss, and heating value. As a result, the preferred grindability was found at torrefaction temperatures of over 220 °C. In terms of energy, we derived two viewpoints: i.e., if minimum energy loss is prioritized, the preferred torrefaction temperature is 220 °C, and for an increase in the heating value of rice straw, 280 °C was preferred. Next, WPTRS was produced using rice straw torrefied at 220 °C and 280 °C, and by changing the mixing ratio of rice straw to wood. Burning tests were conducted to clarify the WPTRS characteristics and the results revealed that the torrefaction at a temperature of 280 °C increased WPTRS's heating value. In addition, the basicity can be used as a good indicator for clinker production when wood and rice straw are used as fuel.

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Effect of torrefaction on the properties of rice straw high temperature pyrolysis char: Pore structure, aromaticity and gasification activity

Cited by 94 publications

References 47 publications

Influence of torrefaction after densification on the fuel characteristics and the inherited gasification kinetics of Erianthus arundinaceus energy grass

Influence of torrefaction after densification on the fuel characteristics and the inherited gasification kinetics of Erianthus arundinaceus energy grass

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

Characteristics of wood pellets mixed with torrefied rice straw as a biomass fuel

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