Characteristics of carbonized sludge for co-combustion in pulverized coal power plants

Park, Sangwoo; CheolHyeon, Jang

doi:10.1016/j.wasman.2010.10.009

Cited by 91 publications

(42 citation statements)

References 16 publications

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“…This study also refers to a batch-type carbonation experiment, conducted by Park and Jang [4], specific to dried sewage sludge at 300-500 °C for 30 min. Koga et al [8] also reported a sewage sludge carbonization system handling 40-60 kg/h of dewatered sludge at a 500 °C carbonation temperature to produce biocoal.…”

Section: Simulation Of the Sewage Sludge Carbonization Processmentioning

confidence: 99%

“…In addition, this study assumes that the carbonization temperature is 450 °C (compared with 500 °C by Koga et al [8]). This lower temperature may be more efficient and reduce energy use [4]. However, Lundin et al [29] showed that the cost of co-incineration with waste was higher than using it in agricultural applications and incineration or fractionation combined with phosphorus recovery.…”

Section: Comparison Of Scenariosmentioning

confidence: 99%

“…Finding alternative energy sources, such as bioenergy, is necessary. Carbonization technology can transform sludge into a carbon-containing product that can be used as biocoal and co-fired with fossil coal to generate electricity in power plants [4][5][6][7][8]. Carbonizing sludge reduces its volume to approximately one-eighth of the sludge cake, increases its calorific value, removes its odor, and improves its combustibility and grindability, making it a better co-firing material for pulverized coal power plants [4,5,9].…”

Section: Introductionmentioning

confidence: 99%

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Environmental Effects of Sewage Sludge Carbonization and Other Treatment Alternatives

et al. 2013

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Carbonization is a newly developed process that converts sewage sludge to biocoal, a type of solid biomass that can partially substitute for coal during power generation. This study presents an assessment of the environmental effects of various sewage sludge treatment processes, including carbonization, direct landfills, co-incineration with municipal solid waste, and mono-incineration in Taiwan. This assessment was conducted using the life cycle assessment software SimaPro 7.2 and the IMPACT2002+ model. Results show that carbonization is the best approach for sewage sludge treatment, followed in descending order by co-incineration with municipal solid waste, direct landfills, and mono-incineration. The carbonization process has noticeable positive effects in the environmental impact categories of terrestrial ecotoxicity, aquatic ecotoxicity, land occupation, ionizing radiation, aquatic eutrophication, non-renewable energy, and mineral extraction. For the emission quantity of greenhouse gases, landfilling has the greatest impact (296.9 kg CO 2 eq./t sludge), followed by mono-incineration (232.2 kg CO 2 eq./t sludge) and carbonization (146.1 kg CO 2 eq./t sludge). Co-incineration with municipal solid waste has the benefit of reducing green house gas emission (-15.4 kg CO 2 eq./t sludge). In the aspect of energy recovery, sewerage sludge that has been pretreated by thickening, digestion, and dewatering still retains a high moisture content, and thus requires a significant amount of energy use when used as a substitute solid fuel. Therefore, the carbonization of sewage sludge would be a more sustainable option if the energy delivery and integration processes are made more efficient.

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Section: Simulation Of the Sewage Sludge Carbonization Processmentioning

confidence: 99%

Section: Comparison Of Scenariosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Environmental Effects of Sewage Sludge Carbonization and Other Treatment Alternatives

et al. 2013

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“…The composition of the organic fraction in biomass doesn't vary much. However, the variation of the moisture and ash content is large [6][7][8]. The most popular way of final sewage sludge management is storage.…”

Section: Introductionmentioning

confidence: 99%

Sewage sludge gasification process for clean and sustainable environment

Werle

2016

Renew. Energy Environ. Sustain.

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Abstract. This work presents a multicriterial investigation of the sewage sludge gasification in the fixed bed gasifier. The operating parameters of gasification were varied over a wide range. Parameters such as air ratio l = 0.12-0.27, gasification agent preheating t = 50-250°C and gasification agent composition (z O2 ¼ 0:21 and z O2 > 0:21) were found to influence syngas lower heating value and syngas composition.

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“…In particular, TG can monitor the sample mass of substance as a function of temperature and/or time, whereas DTG is an approach performed by detecting the rate of mass loss. These two approaches have been used recently in thermal degradation of biomass samples (Eero, 1981;Jakab et al, 1997;Meszaros et al, 2007;Sebestyén et al, 2011;Shafizadeh, 1968;Varhegyi et al, 1988;Villanueva et al, 2011;Wilson et al, 2011), investigations of sewage sludge pyrolysis (Dumpelmann et al, 1991;Magdziarz and Werle, 2014), and combustion (Font et al, 2001;Magdziarz and Wilk, 2013), as well as co-combustion of sewage sludge and other substances (Otero et al, 2002;Park and Jang, 2011;Yu and Li, 2014). Operation parameters of SCPs, such as temperature and atmosphere conditions, were also evaluated using both TG and DTG approaches (Calvo et al, 2013;Manara and Zabaniotou, 2012).…”

Section: Introductionmentioning

confidence: 99%

Consequences of sludge composition on combustion performance derived from thermogravimetry analysis

Xiao

Wang

et al. 2015

Waste Management

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a b s t r a c tWastewater treatment plants produce millions of tons of sewage sludge. Sewage sludge is recognized as a promising feedstock for power generation via combustion and can be used for energy crisis adaption. We aimed to investigate the quantitative effects of various sludge characteristics on the overall sludge combustion process performance. Different types of sewage sludge were derived from numerous wastewater treatment plants in Beijing for further thermogravimetric analysis. Thermogravimetric-differential thermogravimetric curves were used to compare the performance of the studied samples. Proximate analytical data, organic compositions, elementary composition, and calorific value of the samples were determined. The relationship between combustion performance and sludge composition was also investigated. Results showed that the performance of sludge combustion was significantly affected by the concentration of protein, which is the main component of volatiles. Carbohydrates and lipids were not correlated with combustion performance, unlike protein. Overall, combustion performance varied with different sludge organic composition. The combustion rate of carbohydrates was higher than those of protein and lipid, and carbohydrate weight loss mainly occurred during the second stage (175-300°C).Carbohydrates have a substantial effect on the rate of system combustion during the second stage considering the specific combustion feature. Additionally, the combustion performance of digested sewage sludge is more negative than the others.

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Characteristics of carbonized sludge for co-combustion in pulverized coal power plants

Cited by 91 publications

References 16 publications

Environmental Effects of Sewage Sludge Carbonization and Other Treatment Alternatives

Environmental Effects of Sewage Sludge Carbonization and Other Treatment Alternatives

Sewage sludge gasification process for clean and sustainable environment

Consequences of sludge composition on combustion performance derived from thermogravimetry analysis

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