Thermogravimetric analysis of coal and sludge co-combustion with microwave radiation dehydration

Yu, Lilei; Li, P.S.

doi:10.1016/j.joei.2014.03.009

Cited by 22 publications

(9 citation statements)

References 9 publications

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“…The ash content, which is 47.3%, is relatively high compared to the average ash content (40.0%) of 13 different samples of SS in literature 20,24-35 whose ash contents change in range of 27.3-53.8% on dry basis. Besides, HHV, which is 11.6 MJ/kg, is lower than the average HHV (14.0 MJ/kg) for eight SS samples25,26,29,[36][37][38][39][40] whose HHVs vary between 5.2 and 20.1 MJ/kg. Also, the fixed carbon (FC) contents of SS samples used in previous studies change in very wide range of 1.4-18.5% on dry basis, and the average value for these 13 samples was 6.8 20,[24][25][26][27][28][29][30][31][32][33][34][35].…”

mentioning

confidence: 68%

Co‐combustion of lignite with sewage sludge and refuse‐derived fuel

Ozfidan

Haykırı-Açma

Yaman

2019

Env Prog and Sustain Energy

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Burning behavior of fuel blends consisted of lignite samples and waste biomass species such as sewage sludge (SS) and refuse‐derived fuel (RDF) was studied. The blends where the wastes account for 5, 10, and 15 wt% were burned in a thermal analyzer up to 900°C. The nonisothermal burning kinetics were established using Borchardt and Daniels method that bases on the data obtained from differential scanning calorimetry. The maximum rate of combustion (Rmax), the peak temperature (TR‐max), the ignition temperature (Tign), and the burnout temperature (Tb) that predicts the thermal reactivity were considered to evaluate the effects of RDF and SS on the burning characteristics of the lignite samples. It was determined that the combinations of the additive behavior and the synergistic interactions govern the burning characteristics of the fuel blends. The thermal reactivity of the samples can be arranged in the order of RDF > lignite > SS. On the other hand, blending of RDF or SS with the lignite samples did not led to any significant segregation in the heat flow characteristics, and can be concluded that these wastes can be safely burned with lignite.

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confidence: 68%

Co‐combustion of lignite with sewage sludge and refuse‐derived fuel

Ozfidan

Haykırı-Açma

Yaman

2019

Env Prog and Sustain Energy

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“…The air velocity was xed at 6.5 m/s, which was measured by a vane anemometer (Testo, 410i, USA). The thermal treatment at a higher temperature of the sludge results in devolatilization and combustion (He et al 2013;Poudel et al 2015;Yu and Li 2014;Záleská et al 2017). Therefore, the experimental conditions concerning the thermal degradation were studied at air temperatures of 100, 125, and 150 °C in two different thicknesses of the sludge layer as 1 and 2 inches.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Comparative Study of Hot Air Drying and Microwave Drying for Dewatered Sludge

Wulyapash

Phongphiphat

Towprayoon

2021

Preprint

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Large amounts of sludge are generated from wastewater treatment in seafood processing industries. Most of the dewatered sludge in Thailand is not utilized and disposed by landfilling. The dried sludge utilization as refuse-derived fuel (RDF) is an alternative solution due to the gross calorific value (GCV), which is greater than 21.9 MJ/kg. However, the key obstacle is its high moisture content of 87.4% (wet basis). Therefore, drying methods using hot air and microwave techniques were investigated for preparing dried sludge. The effects of hot air temperatures (100-150 °C) and microwave power levels (100-800 W) were compared on drying kinetics, specific energy consumption (SEC), and characteristics of the dried products. The results showed that drying times were decreased by increasing the hot air temperatures. In the same way, the increase in microwave power levels decreased the drying time. The application of microwaves contributed to reducing the drying time by more than 46% compared to the hot air. The reduction of drying times resulted in the saving SEC. The GCV of the dried sludge decreased with the decrease in the volatile matter (VM) due to the high component of VM as 79.5-80.3% (dry ash-free basis). The sludge dried by the microwaves showed a lower GCV than the hot air products. However, dried sludges still had high GCV (≥ 20.8 MJ/kg). Furthermore, the minimal variation of the product characteristics demonstrated that the microwave technique could be applied as an alternative drying method with a rapid process compared to the conventional hot air technique.

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“…The apparent activation energy undertakes an indispensable role in the meantime, that is to say, the bigger the apparent activation energy is, the harder the action goes on [23]. Selecting basis of the model has been introduced in Section 2.3 and the results are as follows.…”

Section: Kinetic Analysis Of Coals and Blended Coals During Low Tempementioning

confidence: 99%