Modelling of pyrolysis of coal–biomass blends using thermogravimetric analysis

Sadhukhan, Anup Kumar; Gupta, Parthapratim; Goyal, Tripurari; Saha, Ranajit

doi:10.1016/j.biortech.2008.03.047

Cited by 130 publications

(42 citation statements)

References 18 publications

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“…The interaction between coal and biomass during thermal co-conversion is an issue yet to be solved; some devolatilization and pyrolysis results of coal and biomass blends have revealed no or very little synergy between the two fuels [44][45][46][47][48][49][50][51][52][53][54][55][56] while others have revealed significant synergy [43,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71]. It is important to segregate the synergistic effect from the catalytic effect engendered by biomass mineral matters; most of the studies that found synergistic effects between the two fuels failed to segregate these two phenomena.…”

Section: Feedstockmentioning

confidence: 99%

“…However, the existence of non-catalytic synergistic effect remains controversial. Some researchers [43,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][101][102][103][104][105][106][107][108] have shown evidence of synergy between biomass and coal while others [44][45][46][47][48][49][50][51][52][53][54][55][56] found no evidence of synergy. Trevor and Kandiyoti [109] pointed out that the way biomass components are intermeshed affects the distribution of pyrolysis products.…”

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

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A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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Abstract:Biomass is relatively cleaner than coal and is the only renewable carbon resource that can be directly converted into fuel. Biomass can significantly contribute to the world's energy needs if harnessed sustainably. However, there are also problems associated with the thermal conversion of biomass. This paper investigates and discusses issues associated with the thermal conversion of coal and biomass as a blend. Most notable topics reviewed are slagging and fouling caused by the relatively reactive alkali and alkaline earth compounds (K 2 O, Na 2 O and CaO) found in biomass ash. The alkali and alkaline earth metals (AAEM) present and dispersed in biomass fuels induce catalytic activity during co-conversion with coal. The catalytic activity is most noticeable when blended with high rank coals. The synergy during co-conversion is still controversial although it has been theorized that biomass acts like a hydrogen donor in liquefaction. Published literature also shows that coal and biomass exhibit different mechanisms, depending on the operating conditions, for the formation of nitrogen (N) and sulfur species. Utilization aspects of fly ash from blending coal and biomass are discussed. Recommendations are made on pretreatment options to increase the energy density of biomass fuels through pelletization, torrefaction and flash pyrolysis to reduce transportation costs.

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Section: Feedstockmentioning

confidence: 99%

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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“…Several authors have observed interactions between the components of coal and biomass blends [10,37], while others have reported additive behaviour [38][39][40][41][42][43]. Table 3 shows the kinetic parameters (E, k 0 and ψ) determined from the data obtained at the three heating rates (5, 10 and 15 K min -1 ) for all the char samples together with the coefficients of determination, R 2 , for each model and char sample.…”

Section: Interactions Between the Components Of The Blendsmentioning

confidence: 99%

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

Fermoso

Gil

Pevida

et al. 2010

Chemical Engineering Journal

115

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The non-isothermal thermogravimetric method (TGA) was applied to a bituminous coal (PT), two types of biomass, chestnut residues (CH) and olive stones (OS), and coalbiomass blends in order to investigate their thermal reactivity under steam. Fuel chars were obtained by pyrolysis in a fixed-bed reactor at a final temperature of 1373 K for 30 min. The gasification tests were carried out by thermogravimetric analysis from room temperature to 1373 K at heating rates of 5, 10 and 15 K min -1 . After blending, no significant interactions were detected between PT and CH during co-gasification, whereas deviations from the additive behaviour were observed in the PT-OS blend.However, for the two coal-biomass blends, the gasification behaviour resembled that of the individual coal, as this component constituted the larger proportion of the blend. The temperature-programmed reaction (TPR) technique was employed at three different heating rates to analyze noncatalytic gas-solid reactions. Three nth-order representative gas-solid models, the volumetric model (VM), the grain model (GM) and the random pore model (RPM) were applied in order to describe the reactive behaviour of the chars during steam gasification. From these models, the kinetic parameters were determined.The best model for describing the reactivity of the PT, PT-CH and PT-OS samples was the RPM model. VM was the model that best fitted the CH sample, whereas none of the models was suitable for the OS sample.

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“…The kinetic parameters of the evolved species were obtained by applying the techniques described in the previous equations (1)(2)(3)(4)(5)(6)(7)(8). For this purpose, the curve of dmi/dt vs. temperature was plotted for the heating rate (20•C/min) using the following equation:…”

Section: Resultsmentioning

confidence: 99%

“…Reference [7,8,9] and many other researchers, developed mathematical approaches to calculate the kinetic parameters.…”

Section: Introductionmentioning

confidence: 99%

The Pyrolysis Behavior of Evolved Species from Date Palm Seeds

Babiker

Aziz

Heikal

et al. 2014

MATEC Web of Conferences

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Abstract. The pyrolytic behavior of evolved gases from date palm seeds (DPSs) were measured to gain insight into the mechanism of DPSs pyrolysis. Six different cultivars were used in this study, namely Deglet nour, Piarom, Suffry, Safawi, Mabroom and Aliya. A thermo-gravimetric analyzer (TGA) and a real-time gas analyzer (GA) were used to calculate the mass losses and the mole fraction of evolved gases, respectively. DPSs samples were pyrolyzed in an inert atmosphere condition using argon with a purge rate of 100 mL/minute. The samples were subjected to non-isothermal operation. An independent single model and parallel reaction model were adopted to interpret the empirical data collected from TGA and GA, respectively. The results reveled that there are three types of pyrolysis zones depending on the main constituents of every cultivars. Moreover, the potentialty of the zones in controlling the pyrolysis behavior was noticeable. The dominant hydrocarbon species in DPSs were CO and CH4 (40 to 50% higher than the rest of species). The mole fraction of CO was 2 to 4 times higher than the mole fraction of CO2. The activation energy and frequency factor of DPSs evolved species showed that Mabroom has the highest activation energy regarding H2 (63.21kJ/mol) and CO (74.32 kJ/mol).

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Modelling of pyrolysis of coal–biomass blends using thermogravimetric analysis

Cited by 130 publications

References 18 publications

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

Kinetic models comparison for non-isothermal steam gasification of coal–biomass blend chars

The Pyrolysis Behavior of Evolved Species from Date Palm Seeds

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