Pyrolysis of municipal sewage sludges in a slowly heating and gas sweeping fixed-bed reactor

Hu, Fan; Zhou, Hua; Wang, Jie

doi:10.1016/j.enconman.2014.05.043

Cited by 71 publications

(25 citation statements)

References 31 publications

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“…4(a), the H2 content of the gas composition increases linearly with the pyrolysis temperature and reaches 32. . This is mainly due to the higher thermal cracking of tar and char conversion at higher temperatures, and high temperatures allow the release of more light gases such as CH4 and C2Hm [25]. This changing tendency is consistent with the report on the CH4 content by…”

Section: Synergetic Effect Calculationsupporting

confidence: 81%

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

154

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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 Calculationsupporting

confidence: 81%

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

154

View full text Add to dashboard Cite

show abstract

“…The classification is generally by heating rate and vapor residence time [6,18]. Initially, pyrolysis was done with slow heating rates (5-7 K/min) which mainly produced char [13,15]. In the last 25 years, pyrolysis at higher heating rates and very short vapor residence times has gained much attention as the process could increase bio-oil yield up to 50 wt.% [11,18].…”

Section: Introductionmentioning

confidence: 99%

“…Most studies used biomass from agriculture crops, for example paddy husk [8,9], oil palm waste [10,11] and sugarcane bagasse [12], several on wood residues such as spruce [13] and birch [14], and from other waste materials including municipal waste [15] and rubber tires [16]. At the heart of a pyrolysis process is the reactor.…”

Section: Introductionmentioning

confidence: 99%

Fast pyrolysis of hardwood residues using a fixed bed drop-type pyrolyzer

Mazlan

Uemura

Osman

et al. 2015

Energy Conversion and Management

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“…The syngas yield is variable; in all conditions, the pyrolysis gas amount is not very high (does not exceed 23%) and the optimum pyrolysis temperature obtained for maximum syngas production is around 500°C. By investigating the effect of reaction temperature (in the range of 450–600°C) on the yields of SS pyrolysis products, [ 1 ] obtained a maximum gas yield of 20% in dry and ash-free basis at 600°C, whereas [ 32 ] reported a maximum yield of gaseous products in the range of 15–25% at high temperature (700°C). Reference [ 17 ], by studying the influence of pyrolysis temperature on products distribution, reported that gas yield remains almost constant (around 20–22%) as the pyrolysis temperature increased from 350 to 550°C but, above 550°C, a significant increase in gas production is observed (reaching a gas yield around 32%).…”

Section: Resultsmentioning

confidence: 99%

Hydrogen-Rich Syngas Production from Gasification and Pyrolysis of Solar Dried Sewage Sludge: Experimental and Modeling Investigations

Trabelsi

Ghrib

Zaafouri

et al. 2017

BioMed Research International

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Solar dried sewage sludge (SS) conversion by pyrolysis and gasification processes has been performed, separately, using two laboratory-scale reactors, a fixed-bed pyrolyzer and a downdraft gasifier, to produce mainly hydrogen-rich syngas. Prior to SS conversion, solar drying has been conducted in order to reduce moisture content (up to 10%). SS characterization reveals that these biosolids could be appropriate materials for gaseous products production. The released gases from SS pyrolysis and gasification present relatively high heating values (up to 9.96 MJ/kg for pyrolysis and 8.02 9.96 MJ/kg for gasification) due to their high contents of H2 (up to 11 and 7 wt%, resp.) and CH4 (up to 17 and 5 wt%, resp.). The yields of combustible gases (H2 and CH4) show further increase with pyrolysis. Stoichiometric models of both pyrolysis and gasification reactions were determined based on the global biomass formula, CαHβOγNδSε, in order to assist in the products yields optimization.

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Pyrolysis of municipal sewage sludges in a slowly heating and gas sweeping fixed-bed reactor

Cited by 71 publications

References 31 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

Fast pyrolysis of hardwood residues using a fixed bed drop-type pyrolyzer

Hydrogen-Rich Syngas Production from Gasification and Pyrolysis of Solar Dried Sewage Sludge: Experimental and Modeling Investigations

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