Pyrolysis, combustion and gasification characteristics of miscanthus and sewage sludge

Jayaraman, Kandasamy; Gökalp, İskender

doi:10.1016/j.enconman.2014.09.058

Cited by 203 publications

(88 citation statements)

References 54 publications

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“…2(a), the total mass loss of sewage sludge is lower than that of wheat straw due to the higher ash content of the former as shown in Table 1. During the pyrolysis process, the major mass loss and gas evolution occur simultaneously with continuous heating of sewage sludge and wheat straw [22]. The beginning and ending temperatures of the decomposition process are important pyrolysis characteristic parameters for a fuel.…”

Section: Synergetic Effect Calculationmentioning

confidence: 99%

Synergetic effect of sewage sludge and biomass co-pyrolysis: A combined study in thermogravimetric analyzer and a fixed bed reactor

Wang

Deng

Tan

et al. 2016

Energy Conversion and Management

147

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Much attention has been given to the valuable products from sewage sludge pyrolysis. In this study, the pyrolysis of sewage sludge, biomass (wheat straw) and their mixtures in different proportions were carried out in a thermogravimetric analyzer (TGA) and fixed-bed reactor. The effects of pyrolysis temperature and percentage of wheat straw in wheat straw-sewage sludge mixtures on product distributions in terms of gas, liquid and char and the gas composition were investigated. Results indicate that there is a significantly synergetic effect during the co-pyrolysis processes of sewage sludge and wheat straw, accelerating the pyrolysis reactions. The synergetic effect resulted in an increase in gas and liquid yields but a decrease in char yield. The gas composition and the synergetic effect degree are strongly affected by the wheat straw proportions, and the strongest synergetic effect of sewage sludge and wheat straw co-pyrolysis appears at the biomass proportion of 60 %. With an increase of temperature, the gas yield from sewage sludge pyrolysis increased but the liquid and char 2 / 22 yields decreased. Moreover, the required heat of co-pyrolysis is significantly reduced compared with the pyrolysis of sewage sludge and wheat straw pyrolysis alone, because of the exothermic reactions between the ash components in two fuel samples.

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Section: Synergetic Effect Calculationmentioning

confidence: 99%

Synergetic effect of sewage sludge and biomass co-pyrolysis: A combined study in thermogravimetric analyzer and a fixed bed reactor

Wang

Deng

Tan

et al. 2016

Energy Conversion and Management

147

View full text Add to dashboard Cite

show abstract

“…TGA and DTA are very useful tools for assessing the thermal characteristics of biomass and its components under a controlled environment and is often associated with kinetic modeling (Magdziarz and Wilk, 2013;Branca and Di Blasi, 2015). Numerous papers have concerned with the kinetics of combustion of lignocellulosic biomass, in terms of rice husk (Saldarriaga et al, 2015), corn straw (Fang et al, 2013), miscanthus (Jayaraman and Gökalp, 2015) and date palm wastes (Sait et al, 2012). Despite the literatures regarding lignocellulosic biomass is abundant, only a limited number of studies are concerned about the combustion of microalgae.…”

Section: Introductionmentioning

confidence: 99%

Combustion behavior and kinetics of low-lipid microalgae via thermogravimetric analysis

Gai

Liu

Han

et al. 2015

Bioresource Technology

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h i g h l i g h t sCombustion of low-lipid microalgae C. pyrenoidosa and S. platensis were studied. Chemical functional groups present in two microalgae were investigated via FTIR. Apparent activation energies for combustion of the two microalgae were calculated. C. pyrenoidosa has a higher reactivity compared to S. platensis during combustion. a r t i c l e i n f o t r a c tThermogravimetric analysis and differential thermal analysis were employed to investigate combustion characteristics of two low-lipid microalgae, Chlorella pyrenoidosa (CP) and Spirulina platensis (SP) and isoconversional Starink approach was used to calculate the kinetic parameters in the present study. The results showed that three stages of mass loss, including dehydration, devolatilization and char oxidation, were observed during combustion of both of two low-lipid microalgae. The whole weight loss of combustion of two microalgae was both shifted to higher temperature zones with increased heating rates from 10 to 40 K/min. In the 0.1-0.9 conversion range, the apparent activation energy of CP increased first from 51.96 to 79.53 kJ/mol, then decreased to 55.59 kJ/mol. Finally, it slightly increased to 67.27 kJ/mol. In the case of SP, the apparent activation energy gradually increased from 68.51 to 91.06 kJ/mol.

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“…The experimental details are presented in detail elsewhere [33,38,39]. During the experiments, about 15 mg of coal sample is placed in a ceramic crucible and heated up to 1150°C with the heating rate of 35°C min -1 .…”

Section: Methodsmentioning

confidence: 99%

Thermogravimetric and evolved gas analyses of high ash Indian and Turkish coal pyrolysis and gasification

Jayaraman

Gökalp

2015

J Therm Anal Calorim

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High ash coals from India and Turkey are investigated in this study. A coupled thermogravimetric analyzer and mass spectrometer system is used for the thermal decomposition characterization of the coal samples and the identification of the volatiles evolved during the various reaction regions. Coal samples are heated in argon, air, oxygen, steam and blended gas mixtures at the temperature range from 25 to 1250°C. The experiments are performed to study the pyrolysis, combustion and gasification characteristics of typical Indian and Turkish high ash coals. Thermogravimetry and derivative thermogravimetry studies are applied to measure the conversion level and half-life time of the coals/chars during and after pyrolysis. The maximum mass loss occurs during the devolatilization stage of coals at the temperatures from 350 to 700°C, where O 2 , CO 2 , CO, H 2 and a small amount of CH 4 are released. Coal particles start to react with steam and produce CO 2 , CO and H 2 when the temperature is increased above 750°C. The gasification reactions are completed around 950°C in steam and steam blended ambience. The reactivity of high ash coal chars mainly depends on reagents' and surrounding gases concentration and also the reaction temperature. The results indicate that the size effect of the char particles is minimal at high gasification temperatures. Char gasification rates determined by TG techniques under isothermal conditions in different reagent flow rates and size effect contribute to enhance the knowledge on high ash coal thermal characterization and gasification and, therefore, to establish the optimum operational conditions for syngas production from high ash coals.

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Pyrolysis, combustion and gasification characteristics of miscanthus and sewage sludge

Cited by 203 publications

References 54 publications

Synergetic effect of sewage sludge and biomass co-pyrolysis: A combined study in thermogravimetric analyzer and a fixed bed reactor

Synergetic effect of sewage sludge and biomass co-pyrolysis: A combined study in thermogravimetric analyzer and a fixed bed reactor

Combustion behavior and kinetics of low-lipid microalgae via thermogravimetric analysis

Thermogravimetric and evolved gas analyses of high ash Indian and Turkish coal pyrolysis and gasification

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