Formation Characteristics of High-density and High-hardness New Briquette Based on Herby Biomass

Mizuno, Satoru; Ida, Tamio; Fuchihata, Manabu; Namba, Keiichi; Kakosaka, Atsushi; Fujita, Osamu

doi:10.3775/jie.91.41

Cited by 8 publications

(8 citation statements)

References 5 publications

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“…The temperature range of the flat region is from 370 K to 520 K. This temperature range coincides with the evaporating temperature of water and the softening temperature of hemi-cellulose associated with hydrolysis until the starting temperature of gasification (Sano and Honjo, 2011). From this investigation of the thermal decomposition properties and the previous research about the same herby biomass as spent green tea grounds (Mizuno, et al 2012), the optimum temperature to mold Bio-coke with the highest apparent specific gravity and the highest compressive strength is determined from the middle of the flat region. Fig.…”

Section: Pyrolysis Characterizationmentioning

confidence: 97%

“…Hence, the biomass solid fuel, Biocoke, has high volume reduction ratio and high strength characteristic at ordinary temperatures. The high volume reduction ratio is due to Bio-coke having high apparent specific gravity of 1.20 ~ 1.38 , Mizuno, et al 2012, Torii, et al, 2012, about 3.5 times the apparent specific gravity of wood biomass. Bio-coke's compressive strength is approximately 60 ~ 200 MPa at ordinary temperature , Mizuno, et al 2012, Torii, et al, 2012.…”

Section: Introductionmentioning

confidence: 99%

“…The high volume reduction ratio is due to Bio-coke having high apparent specific gravity of 1.20 ~ 1.38 , Mizuno, et al 2012, Torii, et al, 2012, about 3.5 times the apparent specific gravity of wood biomass. Bio-coke's compressive strength is approximately 60 ~ 200 MPa at ordinary temperature , Mizuno, et al 2012, Torii, et al, 2012. However, the effect on the ultimate compressive strength by differences of specimen size has not been described on the patent and not investigated yet.…”

Section: Introductionmentioning

confidence: 99%

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Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds

Mizuno¹,

Ida

Fuchihata

et al. 2016

Mechanical Engineering Journal

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Various sizes of high-density biomass briquette, named 'Bio-coke,' were produced from spent green tea grounds. The mechanical properties at room temperature of the Bio-coke samples were investigated using a compression testing machine. From the results, the relationship between the specimen size of Bio-coke and the ultimate compressive strength at room temperature showed that the ultimate compressive strength depends on the specimen size of Bio-coke. The maximum value of the ultimate compressive strength among the different specimen sizes of Bio-coke was at 67 MPa, obtained from the 12-mm diameter sample. In addition, at 12 mm diameter or smaller, there is hardly any difference in the ultimate compressive strengths measured. Hence, the cold compressive strength properties are divided into two groups based on the uniformity of the structure of the main components along the horizontal cross section of a Bio-coke. Results indicate that the state of the structure, composed of cellulose, hemi-cellulose, and lignin, appears to be consistent resulting from uniform permeation conditions at the 12-mm diameter or smaller samples. Meanwhile, at diameters of 20 mm or larger, the condition of the periphery of the samples were not consistent with that of the middle region because of the temperature, stress gradient and number of void occurring inside the Bio-coke caused by specimen size effect.

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Section: Pyrolysis Characterizationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds

Mizuno¹,

Ida

Fuchihata

et al. 2016

Mechanical Engineering Journal

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“…Because the formation conditions affect the softening and fluidity properties of biomass. An adhesive property of biomass, fluidity of hemicellulose and lignin which are biomass components, is activated under high temperature (Mizuno et al, 2012). It was also reported that the mechanical characteristics of BIC were affected by the type of biomass.…”

Section: Introductionmentioning

confidence: 99%

Solidification characteristics of green tea as raw material of solid fuel

Tagami

Ida

2019

Mechanical Engineering Journal

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Biocoke (BIC), made from all types of biomass is a solid fuel. Hemicellulose and lignin, essential chemical components of biomass, work as bonding agents of BIC solidification because they have softening and fluidity characteristics. Their characteristics make bonding structure inside of BIC during the formation process. Previous studies suggested that physical and mechanical characteristics of BIC are different if raw materials (kinds of biomass) are different even if forming conditions are the same. It was inferred that the reason was different of content rate of main components. Among various biomass, green tea has excellent formability. In this paper, we focus on the potential of green tea as a raw material of BIC. Firstly, we compared the fluidity of green tea with other biomass. Then, compressive strength tests of BIC made from green tea and other biomass were conducted. We used the trunk of conifers, the bark of conifers, bagasse, and rice straw other than green tea. The result of fluidity test indicated that green tea is easiest-to-flow biomass among the five biomasses. Moreover, the flow starting temperature was able to estimate from a content percentage and moisture content with ±30% accuracy by using our estimated equation. As results of compressive strength test, each BIC which was made from five biomasses have two peak points of compressive strength and apparent density. Green tea BIC made under all the test conditions has high apparent density 1.3-1.4 g/cm 3. On the other hand, green tea BIC has the lowest compressive strength among the five biomasses tested. We found out that the raw material which it is easy to fluidize by heating has low compressive strength from these results.

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“…9) Briquetting of biomass at higher temperature up to 210°C was investigated. 10) Mechanical pressurization to 22 MPa produced briquettes of reed with compressive strength of 20-120 MPa.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Coke from Hydrothermally Treated Biomass in Sequence of Hot Briquetting and Carbonization

et al. 2014

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A sequence of briquetting of biomass solids (bamboo, larch and mallee) at temperature and mechanical pressure of respectively, and carbonization at 900°C produces coke with tensile strength (TS) of 5-19 MPa. Introduction of heat treatment in hot-compressed water (i.e., hydrothermal treatment; HT) of the biomass prior to the briquetting increases TS up to 44, 57 and 42 MPa for the bamboo, larch and mallee, respectively. TS of coke is correlated well and positively with the coke/briquette bulk density ratio, and HT increases the ratio if operated under appropriate conditions. The efficacy of HT is attributed primarily to increase in the coke yield on a basis of the briquette mass. HT hydrolytically removes highly volatile cellulosic material (i.e., cellulose and hemicellulose), transforms it into solid that contributes to coke as effectively as lignin, and thereby increases the mass yield of coke by a factor of 1.4 to 2.1. HT also enhances the plasticizability of the biomass during the briquetting by degradation of the lignin to reasonable extent, and then promotes particles' coalescence/fusion and densification of the briquettes. Applying mechanical pressure over a range of 12-114 MPa to the briquetting of a solid from HT of the bamboo at 240°C successfully results in production of coke with TS of 41-44 MPa.

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Formation Characteristics of High-density and High-hardness New Briquette Based on Herby Biomass

Cited by 8 publications

References 5 publications

Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds

Effect of specimen size on ultimate compressive strength of Bio-coke produced from green tea grounds

Solidification characteristics of green tea as raw material of solid fuel

Preparation of Coke from Hydrothermally Treated Biomass in Sequence of Hot Briquetting and Carbonization

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