A Study for Torrefied Characteristics of Torrefied Green Tea Based on Index of the Coal

Tagami, Nami; Nakadate, Tomoe; Mizuno, Satoru; Ida, Tamio

doi:10.3775/jie.97.1

Cited by 1 publication

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“…In WT process in this study, dehydration is considered as a main reaction. The results shown here are also obtained in the previous studies on WTB (Benavente et al, 2015;Bach and Skreiberg, 2016a) and DTB (Chen et al, 2015;Tagami et al, 2018).…”

Section: Chemical and Energy Properties Of Wtb 31 Ultimate Analysissupporting

confidence: 88%

Wet torrefaction kinetics and heating value estimation for wet torrefied Japanese cedar and rice straw

INOUE,

TAMAKOSHI,

SAWAI

2024

JTST

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One effective measure to achieve carbon neutrality is to shift away from coal. Wet torrefied biomass (WTB) can be the promising solid biofuels to replace coal, when high moisture content biomass is used as feedstock. To utilize WTB for industrial use, WTB with predetermined energy properties such as higher heating value (HHV) and solid mass yield (SMY) has to be produced to meet the requirement in coal-fired power plants and industrial boilers. In this study, the analytical approach to estimate SMY and HHV of WTB for given wet torrefaction (WT) process parameters, temperature and residence time is investigated for Japanese cedar and rice straw. The Van Krevelen diagram shows that dehydration is considered as a main reaction of WTB, which is the same result as the previous studies on dry torrefied biomass (DTB). HHVs of WTB as well as DTB are well correlated with its SMY, and the experimental correlations of HHV are proposed as a function of SMY. The difference in HHV of rice straw between WTB and DTB and the difference in HHV between Japanese cedar and rice straw are closely related to the difference in ash content and the ash removal effect in WT process. The WT reaction based on volatile release is modeled as the single reaction with only one reaction rate constant of volatiles evolved. It is found that the solid-state reaction function codes F12 and D1 are the most suitable for Japanese cedar and rice straw, and kinetic parameters in WT process are determined. The estimation method of SMY and HHV is proposed based on the WT kinetic model and the HHV experimental correlation. It is found that the WT temperature and residence time to produce WTB with predetermined SMY and HHV can be provided by the proposed estimation method within an accuracy of about 10%.

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Section: Chemical and Energy Properties Of Wtb 31 Ultimate Analysissupporting

confidence: 88%

Wet torrefaction kinetics and heating value estimation for wet torrefied Japanese cedar and rice straw

INOUE,

TAMAKOSHI,

SAWAI

2024

JTST

View full text Add to dashboard Cite

show abstract

A Study for Torrefied Characteristics of Torrefied Green Tea Based on Index of the Coal

Cited by 1 publication

References 0 publications

Wet torrefaction kinetics and heating value estimation for wet torrefied Japanese cedar and rice straw

Wet torrefaction kinetics and heating value estimation for wet torrefied Japanese cedar and rice straw

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