Combustion performance and slagging characteristics during co-combustion of Zhundong coal and sludge

Qi, Xiaobin; Song, Guoliang; Song, Weijian; Yang, Shu; Qi, Lu

doi:10.1016/j.joei.2017.02.002

Cited by 80 publications

(39 citation statements)

References 37 publications

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“…However, our sample is even poorer T A B L E 1 Analysis results all of these samples with a FC content of 1.4%. Besides, the VM content (51.3%) is almost comparable with the average VM content of 50.1% for 16 samples given in literature that have VM contents in the range of 42.5-65.3% 20,21,25,[27][28][29][31][32][33][34][35][41][42][43][44][45]. Furthermore, the proximate analysis results of SS used in this study are highly comparable with those of SS used by Folgueras et al28…”

supporting

confidence: 87%

“…The HHV and the ash content of solid fuels are the key parameters to characterize the fuel quality, and the analysis results of SS sample indicate that it has relatively poor fuel properties. 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 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 samples whose HHVs vary between 5.2 and 20.1 MJ/kg.…”

Section: Resultsmentioning

confidence: 71%

“…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]. However, our sample is even poorer T A B L E 1 Analysis results all of these samples with a FC content of 1.4%.…”

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confidence: 61%

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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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supporting

confidence: 87%

Section: Resultsmentioning

confidence: 71%

mentioning

confidence: 61%

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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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“…Tobias Pape Thomsen et al introduced the control technologies of the SS in various parts of the world and summarised their characteristics and limitations. Given the high moisture and low calorific value of the SS, reusing the heat value as a separate fuel is not feasible; thus, most researchers focused on co‐combustion with other high‐calorie fuel . Documents also pointed out that many studies on the kinetics of the co‐combustion between SS and coal laid a good foundation for the practical application of the SS thermal energy.…”

Section: Introductionmentioning

confidence: 99%

“…Given the high moisture and low calorific value of the SS, reusing the heat value as a separate fuel is not feasible; thus, most researchers focused on co-combustion with other highcalorie fuel. 8 Documents 9-11 also pointed out that many studies on the kinetics of the co-combustion between SS and coal laid a good foundation for the practical application of the SS thermal energy. In the study of synergism of co-combustion between sludge and coal, Ruikun Wang 12 pointed out that the reaction rate is a key factor in the heat transfer.…”

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confidence: 99%

Experimental investigation on co-combustion kinetics and gas emission law of sewage sludge-bituminous coal

Yang

et al. 2018

Int J Energy Res

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Summary The kinetic mechanism of the co‐combustion of sewage sludge (SS) and bituminous coal (BC) is studied. The separate combustion process of the SS can be divided into four stages, as follows: moisture precipitation, volatile precipitation, non‐volatile substance precipitation, and fixed carbon burnout. During the co‐combustion of the mixture, SS and BC maintained their respective combustion properties. The SS can significantly improve the ignition and combustion performance of BC. Through Fourier transform infrared spectroscopy analysis, we found that the main combustible component in the SS is the volatile organic matter, and the main emission product is CO2. These results provide a theoretical basis for the new technology of combined power generation of SS energy recycling.

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Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility

Jin

Yang

et al. 2022

Asia-Pacific J Chem Eng

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Thermal power plants in Zhundong area of Xinjiang equip Π-typed boiler widely in recent years. With the increasing ratio of Zhundong coal in blended fuels, the slagging is strengthened. And the boiler shutdown was caused by ash deposition on the convective heating surface frequently. In order to study the mechanism of this problem, a 0.4-MW th pilot-scale facility was built and expected to study ash deposition and heat transfer characteristics on the convective heating surface of 100% burning calcium-rich Zhundong coal.Thermodynamic model calculation was implemented on the heat transfer characteristics of two groups of tube panels, on which ash samples were collected after experiments. Then, simulation calculation was applied by software for verification. The ash samples were characterized by X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray detector (EDX). FactSage 7.3 thermochemical software package and a high-temperature viscometer were also used to figure out the viscosity-temperature characteristics. Results showed that a "step change" of heat transfer characteristics occurred when the flue gas temperature of inlet tube panel #2 approached to 1000 C. After the "step change," the heat transfer characteristics became stable. The ash deposition mainly consisted of siliconcalcium compounds of tube panel #1, while in contrast, that of tube panel #2 consisted of gehlenite, CaSO 4 , and Na 2 SO 4 . The ratio of liquid phase in raw coal ash samples increased sharply when the flue gas temperature exceeded 1030 C. With the increase of surface temperature of fouling tube panel, the CaSO 4 would be decomposed to release CaO, which reacted with gehlenite or other compounds to form low temperature eutectics. The fouling of ash would transfer to slagging and lead to the deterioration of ash deposition, which induced the formation of "step change" during the experiment.

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Combustion performance and slagging characteristics during co-combustion of Zhundong coal and sludge

Cited by 80 publications

References 37 publications

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

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

Experimental investigation on co-combustion kinetics and gas emission law of sewage sludge-bituminous coal

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility

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Combustion performance and slagging characteristics during co-combustion of Zhundong coal and sludge

Cited by 80 publications

References 37 publications

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

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

Experimental investigation on co-combustion kinetics and gas emission law of sewage sludge-bituminous coal

Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MWth facility

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Ash deposition and heat transfer characteristics on the convective heating surface of calcium‐rich Zhundong coal combustion in a 0.4‐MW_th facility