An investigation of thermal behaviour of biomass and coal during co-combustion using thermogravimetric analysis (TGA)

Vhathvarothai, Navirin; Ness, James; Qian, Yu

doi:10.1002/er.3083

Cited by 32 publications

(10 citation statements)

References 49 publications

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“…Accurate enthalpies are therefore difficult to calculate in such open system. However, the calculated combustion enthalpy (ΣE) for the reference fibers was reasonably close to the ones found in the literature [63,64]. The ΣE was clearly reduced by the LDH especially after Uhyd synthesis (Table 2).…”

supporting

confidence: 54%

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Lange

Lastusaari

Reza

et al. 2015

Fibers

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Inorganic Mg2+ and Al 3+ containing layered double hydroxide (LDH) particles were synthesised in situ from aqueous solution onto chemical pulp fibers of pine (Pinus sylvestris). High super saturated (hss) solution with sodium carbonate produced LDH particles with an average diameter of 100-200 nm. Nano-size (70 nm) LDH particles were found from fibers external surface and, to a lesser degree, from the S2 cell wall after synthesis via low super saturated (lss) route. The synthesis via slow urea hydrolysis (Uhyd) yielded micron and clay sized LDH (2-5 µm) and enabled efficient fiber densification via mineralization of S2 fiber wall layer as indicated by TEM and compliance analysis. The Uhyd method decreased fiber compliance up to 50%. Reduction in the polymerisation degree of cellulose was observed with capillary viscometry. Thermogravimetric analysis showed that the hybridization with LDH reduced the exothermic heat, indicating, that this material can be incorporated in flame retardant applications. Fiber charge was assessed by

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supporting

confidence: 54%

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Lange

Lastusaari

Reza

et al. 2015

Fibers

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“…In addition, analysis of the curves also indicate that the TDP is a 3-step occurrence involving the loss of moisture or drying from (30-175 °C), active devolatization or loss of volatiles from (175-400 °C) and char degradation (400-1000 °C) denoted by the long tailing in the DTG curves. Similar trends have been reported for biomass samples in literature [20,21].…”

Section: Chemical Fuel Propertiessupporting

confidence: 90%

Kinetic analysis of oil palm empty fruit bunch (OPEFB) pellets as feedstock for pyrolysis

Nyakuma

2015

Preprint

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The thermal behaviour and decomposition kinetics of pelletized oil palm empty fruit bunch (OPEFB) was investigated in this study using thermogravimetric analysis (TGA). The OPEFB pellets were heated from room temperature to 1000 ºC at different heating rates; 5, 10 and 20 °C min -1 under inert atmosphere. Thermal degradation occurred in three steps; drying, devolatization and char decomposition. Subsequently, the Popescu method was applied to the TG/DTG data to determine the kinetic parameters of the OPEFB pellets. The activation energy, E, for different degrees of conversion, α = 0.05 to 0.7 are 36.60 kJ/mol to 233.90 kJ/mol with high correlation R 2 values. In addition, the drying and decomposition of lignin reactions displayed lower E values compared to the devolatization characterized by high E value of 233 kJ/mol at α = 0.2. This indicates that the devolatization process is slower and requires higher energy requirement to reach completion than the other stages of thermal decomposition of the fuel under inert atmosphere.

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“…The coal‐forming process will disrupt some of the bonds and aromatic ring structures that are connected to the coal structure, forming some intermediates such as acids, phenols, alcohols, and ketones under the microbial metabolism and dehydrogenase, carboxylase, and synthase action. Oxygen atoms will be introduced into the coal structure in this process, resulting oxygen content increase . The carbon content will decrease with continuous production of methane and the consumption and dissolution of organic carbon in coal .…”

Section: Resultsmentioning

confidence: 99%

“…Oxygen atoms will be introduced into the coal structure in this process, resulting oxygen content increase. 35,36 The carbon content will decrease with continuous production of methane and the consumption and dissolution of organic carbon in coal. 37 However, the change in the carbon and oxygen content after the secondary gas production is exactly opposite to that of the primary degradation.…”

Section: Change In the Surface Element Contentmentioning

confidence: 99%

Controlling mechanism of coal chemical structure on biological gas production characteristics

et al. 2020

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Summary To find the effect of coal chemical structure on biogas production, Lignite B was collected and extracted with nitrogen methylpyrrolidone (NMP), acetone and 0.60 mol/L NaOH. Simultaneously, methanogenic bacteria were enriched, and gas production experiments involving solvent extraction from residual coal and secondary gas production experiments involving coal were performed. The characteristics of biogas production, microcrystalline structure and coal chemical structure were analyzed. The results showed that the biogas production capacity of residual coal extracted by different solvents differed. The biogas production capacity of residual coal extracted by 0.60 mol/L NaOH was severely inhibited. The biogas production capacity of residual coal extracted by NMP and acetone was enhanced compared with that of raw coal. In contrast, primary residual coal still exhibits potential for methane production, but the methane production efficiency was reduced. Changes in the microcrystalline structure and functional groups of residual coal showed that solvent extraction increases the spacing and stacking height of the aromatic lamellae of coal, reduces the hydroxyl, methyl, methylene and aromatic hydrocarbon levels in coal, loosens the macromolecular network structure of coal, and enhances the connectivity of pores and fissures, thus allowing methane‐producing bacteria to enter the coal mass and create favorable conditions for gas production through interactions between the two. X‐ray photoelectron spectroscopy measurements showed that the secondary gas production increased the C content on the coal surface, decreased the O content and the O/C ratio, thus promoting the consumption of oxygen‐containing functional groups on the coal surface to further produce gas.

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An investigation of thermal behaviour of biomass and coal during co-combustion using thermogravimetric analysis (TGA)

Cited by 32 publications

References 49 publications

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

In Situ Hybridization of Pulp Fibers Using Mg-Al Layered Double Hydroxides

Kinetic analysis of oil palm empty fruit bunch (OPEFB) pellets as feedstock for pyrolysis

Controlling mechanism of coal chemical structure on biological gas production characteristics

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