Investigating pyrolysis and combustion characteristics of torrefied bamboo, torrefied wood and their blends

Mi, Bingbing; Liu, Zhijia; Hu, Wanhe; Wei, Penglian; Jiang, Zehui; Fei, Benhua

doi:10.1016/j.biortech.2016.02.087

Cited by 84 publications

(23 citation statements)

References 23 publications

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“…Fryda et al (2014) concluded that dry torrefaction improved the physical properties of bamboo, including grindability and moisture content, but wet torrefaction removed salts and minerals from bamboo. Mi et al (2016) confirmed that torrefaction improved the fuel characteristics of bamboo wastes, such as the heating value, ash and C/H and C/O ratios. Furthermore, torrefied bamboo had a lower ignition temperature and a higher reactive potential than raw bamboo (Bada et al, 2014).…”

Section: Introductionsupporting

confidence: 52%

Investigating the co-firing characteristics of bamboo wastes and coal through cone calorimetry and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy

et al. 2019

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To evaluate the combustion characteristics of raw or torrefied bamboo wastes and coal blends, the co-firing process determined by cone and pollutant emission was investigated by thermogravimetric analysis coupled with Fourier transform infrared spectroscopy. The results showed that torrefaction improved the fuel properties of bamboo wastes. Torrefied bamboo had a lower volatile fuel ratio, H/C and O/C ratios, pollutant emission and a higher heating value. They further affected the co-firing process of raw or torrefied bamboo and coal. All blends had a lower ignition temperature and a more stable flame than coal. Torrefied bamboo and coal blends had a lower percentage of quality loss, a higher heat release rate (HRR), total heat release (THR) and total smoke release (TSR). With an increase in the proportion of torrefied bamboo in the blends, the HRR, THR, TSR and percentage of quality loss increased. The main pollutant emissions included CO2, CO, SO2 and NO x. All blends of torrefied bamboo and coal had a lower pollutant emission. The optimum blend suggested was 20% torrefied bamboo/80% coal.

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Section: Introductionsupporting

confidence: 52%

Investigating the co-firing characteristics of bamboo wastes and coal through cone calorimetry and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy

et al. 2019

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“…However, the cellulose structure of bamboo occurs to change at torrefaction temperature of around 275°C 11 . Based on previous research results of our group, torrefied bamboo and wood had similar fuel properties with coal and was suitable for co‐firing with coal, compared to raw biomass 12‐14 . Especially, the fouling behavior of wet torrefied bamboo was similar with woody biomass, which is obviously higher than that of raw bamboo, compared with raw woody biomass 15 .…”

Section: Introductionmentioning

confidence: 89%

The chemical and structural transformation of bamboo wastes during torrefaction process

Feng

Jin

et al. 2020

Env Prog and Sustain Energy

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To investigate the chemical and structural transformation of bamboo during torrefaction process, bamboo wastes were torrefied at temperatures of 200, 250, and 300°C and residence times of 1.0, 1.5, and 2.0 hr, whose properties were determined by thermogravimetry coupled with mass spectrometry (PY‐MS), Fourier transform infrared spectrometer (FTIR), X‐ray diffraction (XRD), and solid‐state nuclear magnetic resonance spectroscopy (NMR). The results showed that torrefaction improved the energy density and calorific value, reduced the volatile matters, and pollutant emission of bamboo wastes. The chemical and structural transformation of bamboo wastes was due to pyrolysis of some chemical groups. Torrefaction temperatures had the more significant effect than residence times. The energy enrichment factor (EEF), the calorific value improvement (CVI), and fuel ratio (FR) of torrefied bamboo wastes increased with the increase of torrefaction temperatures and residence times. When torrefaction temperatures increased to 300°C, crystalline region of cellulose was destroyed. There were more than 10 families of pyrolysis products, including alcohol, acid, aldehyde, alkane, ester, ether, furan, ketone, phenol, etc. Torrefaction changed the chemical environment of H atoms from aromatics of guaiacs unit, β‐O‐4 structure, β‐β structure to xylan. The β‐O‐4 bond was broken in guaiacle unit and formed aromatization and alkyl side chains. The results will be helpful to reveal torrefaction mechanism of bamboo wastes and further develop their add‐valued utilization as energy products.

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“…For the biochars prepared at 350°C, the peaks corresponding to the release of volatiles are not observed in Figure 7(c). The last thermal decomposition peaks attributed to the decomposition of lignin, tar and/or char appear prominently with increasing the treatment temperature (Ren et al, 2013;Mi et al, 2016). At 250°C, the only biochar prepared by a 20-MPa compression has a prominent peak for the fixed carbon decomposition.…”

Section: Thermogravimetric Analysesmentioning

confidence: 99%

Torrefaction Characteristics of Japanese Cedar Sawdust with a Mechanical Compression in Air Atmosphere

Fernanda

Kawahara

Higashi

et al. 2019

J. Chem. Eng. Japan

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In this study, biochars were prepared from Japanese cedar sawdust with a mechanical compression at di erent temperatures in an air atmosphere. The compression pressure at a given constant value was applied to the raw material during the torrefaction process. Experimental results indicated that the compression positively improved the fuel properties of the biochar obtained. The carbon content in biochar increased; whereas the oxygen and hydrogen contents decreased. The H/C ratio of biochar was generally proportional to its O/C ratio, and biochars prepared at temperatures of more than 300°C were in proximity to bituminous or sub-bituminous coals in the van Krevelen diagram. Torrefaction at 300°C and 3 MPa gave biochar with a higher heating value of 29.8 MJ/kg and an energy yield of 0.85. Furthermore, the di erential thermal analyses showed that the peaks corresponding to the release of volatile matters from biochar decreased with an increase in the compressive load. Consequently, torrefaction of Japanese cedar sawdust with compression in an air atmosphere would be a promising method to produce biochars as an alternative fuel.

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Investigating pyrolysis and combustion characteristics of torrefied bamboo, torrefied wood and their blends

Cited by 84 publications

References 23 publications

Investigating the co-firing characteristics of bamboo wastes and coal through cone calorimetry and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy

Investigating the co-firing characteristics of bamboo wastes and coal through cone calorimetry and thermogravimetric analysis coupled with Fourier transform infrared spectroscopy

The chemical and structural transformation of bamboo wastes during torrefaction process

Torrefaction Characteristics of Japanese Cedar Sawdust with a Mechanical Compression in Air Atmosphere

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