Upgrading and dewatering of raw tropical peat by hydrothermal treatment

Mursito, Anggoro Tri; Hirajima, Tsuyoshi; Sasaki, Keiko

doi:10.1016/j.fuel.2009.07.004

Cited by 129 publications

(51 citation statements)

References 26 publications

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“…Recent studies 18,19) showed simultaneous progress of depolymerization and polymerization 18) and formation of monomeric phenol derivatives. 19) HT is thus recognized to be a method to upgrade biomass to a lignin-enriched solid, 20) and it is therefore worth to study a sequence of HT, hot briquetting and carbonization examining the efficacy of HT in preparation of coke from the biomass. A potential problem of the ligninrich solid is, even if prepared successfully by HT, is its propensity for foaming upon heating at temperature of 200-300°C.…”

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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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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“…Details of the HT apparatus and experimental procedure have been given previously 17,18) . In brief, the as-received raw lignite (about 6 g) was placed in a steel lter (ϕ = 60 μm), and three of the steel lters were xed in the middle of a 0.5 L batch-type reactor (Taiatsu Techno MA22) that was equipped with an automatic temperature controller and had a maximum temperature of 400 C and a maximum pressure of 30 MPa (Fig.…”

Section: Methods 221 Hydrothermal Treatmentmentioning

confidence: 99%

Effect of Hydrothermal Treatment Coupled with Mechanical Compression on Equilibrium Water Content of Loy Yang Lignite and Mechanism

et al. 2016

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Measurements of equilibrium water contents (EWCs) in samples obtained from hydrothermal treatment (HT) and HT coupled with mechanical compression (HT-MC) were undertaken across a range of relative humidities (RHs) to investigate the performance of EWC and its mechanism. The changes in the concentrations of carboxyl groups and mesopore volume were measured by an improved barium ion exchange and N 2 adsorption-desorption isotherms methods, respectively. The results showed that EWCs decreased with progressively severe HT and HT-MC conditions and EWCs of HT-MC samples were lower than those of HT samples, indicating that HT and HT-MC can upgrade lignite by reducing water loading capacity and HT-MC was better than HT. At low RHs (RH ≤ 10%), the factor that controls EWC is water moleculesactive sites interactions and one to two water molecules are associated with each carboxyl group, while at medium RHs (10 < RH ≤ 92%) the amount of monolayer water and mesopore volume gain in signi cance and ca. two multilayer water molecules are bound to each monolayer water molecule. At high RHs (RH > 92%), EWC is determined by comprehensive factors such as macropores and cracks. Furthermore, EWC can be either higher or lower than residual water content (RWC) based on the RH within a threshold residual water level (ca. 5 to 16%). EWC was generally higher than RWC below a RWC of ca. 5% and the opposite relationship was observed for samples with RWC above ca. 16%. These provide information for the operation of lignite dewatering technique, the control of its water re-adsorption, and storage.

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“…The increase in the calorific values for SM 1 and SM 2 was influenced by their cellulose and hemicellulose content. As reaction temperatures increase, the calorific value of solid products increases, but the amount of solid product decreases due to [7,[18][19][20][21]. Therefore, in hydrothermal reactions, an optimum temperature should be maintained to maximize the energy recovery efficiency (ERE) [22][23][24].…”

Section: Changes In Calorific Value and Energy Recovery Efficiencymentioning

confidence: 99%

“…The H/C and O/C ratios of SM 1, SM 2, cellulose, hemicellulose, and lignin decreased with the coalification status between lignite and sub-bituminous coal. This occurs when the biomass components of MSW are converted into carbonaceous products by chemical dehydration reactions during hydrothermal treatment (4(C 6 H 10 O 5 )n ⇔ 2(C 12 H 10 O 5 )n + 10H 2 O) [6,10,11,18,20]. Due to dewatering, dehydration, and decarboxylation, hydrothermal reactions can enhance biomass properties by reducing the hydrogen and oxygen contents of reaction products, resulting in increased calorific values of biomass products.…”

Section: Coalification Band Of Hydrothermal Productsmentioning

confidence: 99%

Conversion of Municipal Solid Wastes into Biochar through Hydrothermal Carbonization

Kim¹,

Park²,

Yoshikawa³

2017

Engineering Applications of Biochar

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In this study, the hydrothermal treatment of municipal solid wastes (MSWs) for the production of biochar as a renewable solid fuel was investigated. The properties of surrogate MSWs and mixtures of newspaper and vegetables were greatly improved by hydrothermal treatment and were similar to those of coal-like fuel substances. Hydrothermal treatment increased the calorific value, the fixed carbon, and carbon contents. The composition of the major biomass components of MSW was found to affect the alternation of their physical and chemical properties significantly. These characteristic changes in pure cellulose, hemicellulose, and lignin were similar to those of coalification at the hydrothermal reaction temperature range of 150-280°C. The treated products became a solid fuel substance, the characteristics of which corresponded with fuel between lignite and subbituminous coal. The results of this study indicate that hydrothermal treatment can be used as an effective means to generate highly energy-efficient renewable fuel resources using MSWs.

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Upgrading and dewatering of raw tropical peat by hydrothermal treatment

Cited by 129 publications

References 26 publications

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

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

Effect of Hydrothermal Treatment Coupled with Mechanical Compression on Equilibrium Water Content of Loy Yang Lignite and Mechanism

Conversion of Municipal Solid Wastes into Biochar through Hydrothermal Carbonization

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