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Co-combustion of sludge with coal

Author

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  • Nadziakiewicz, Jan
  • Koziol, Michal

Abstract

Utilisation of waste-water sludge is one of the most difficult processes of environment protection because of the high moisture and contents of harmful substances. The waste-water treatment systems in Poland, especially in small towns, are often not separate from industrial sewage systems and this causes relatively large contents of heavy metals and other toxic substances in the sludge. Incineration is the only effective method of utilisation of such waste material. From the other side, coal is still the most popular fuel in Poland, and it is often used in many boilers producing hot water for the central heating of buildings or parts of the towns. Mostly they are stoker fired boilers of old construction, and they need urgent modernisation. The use of stoker-fired boilers for incineration of the sludge in small towns is the object of the analysis presented in this paper. There are two important points in the co-combustion of sludge with coal in a stoker-fired boilers: ecological and exploitation requirements. The important restriction of the sludge/coal ratio is the emission of harmful substances with the flue gas. There are substances originating from the components of the sludge: SO2, NOx, HCl, heavy metals and dust. Their concentrations in the flue gas should meet the environmental regulations. The other factor influencing the co-combustion process is the change of physical and thermal properties of the fuel: heating value, moisture content and ash composition. These influence the thermal output of the boiler, the amount of air required for combustion, the volume of flue gases and dust concentration and particle distribution. In this paper, the results of experiments performed with an experimental boiler are presented. The effects of the following parameters are considered: composition and thermal parameters of the sludge and their change during the year, emissions of SO2, NOx, CO and dust from the experimental boiler for various compositions of the fuel (sludge/coal ratio, moisture content). As a result of the analysis, the parameters limiting the amount of sludge in a mixture with coal are identified.

Suggested Citation

  • Nadziakiewicz, Jan & Koziol, Michal, 2003. "Co-combustion of sludge with coal," Applied Energy, Elsevier, vol. 75(3-4), pages 239-248, July.
    • Handle: RePEc:eee:appene:v:75:y:2003:i:3-4:p:239-248
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    Citations

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    Cited by:

    1. Madiyar Aidabulov & Daulet Zhakupov & Khabiba Zhunussova & Aknur Temireyeva & Dhawal Shah & Yerbol Sarbassov, 2023. "Thermal Characterization, Kinetic Analysis and Co-Combustion of Sewage Sludge Coupled with High Ash Ekibastuz Coal," Energies, MDPI, vol. 16(18), pages 1-13, September.
    2. Małgorzata Wzorek, 2020. "Evaluating the Potential for Combustion of Biofuels in Grate Furnaces," Energies, MDPI, vol. 13(8), pages 1-15, April.
    3. Folgueras, M. Belén & Díaz, R. María & Xiberta, Jorge, 2005. "Pyrolysis of blends of different types of sewage sludge with one bituminous coal," Energy, Elsevier, vol. 30(7), pages 1079-1091.
    4. Hao, Runlong & Zhang, Zili & Zeng, Qinda & Mao, Yumin & He, Hongzhou & Mao, Xingzhou & Yang, Fan & Zhao, Yi, 2018. "Synergistic behaviors of anthracite and dried sawdust sludge during their co-combustion: Conversion ratio, micromorphology variation and constituents evolutions," Energy, Elsevier, vol. 153(C), pages 776-787.
    5. Chen, Jiacong & He, Yao & Liu, Jingyong & Liu, Chao & Xie, Wuming & Kuo, Jiahong & Zhang, Xiaochun & Li, Shoupeng & Liang, Jialin & Sun, Shuiyu & Buyukada, Musa & Evrendilek, Fatih, 2019. "The mixture of sewage sludge and biomass waste as solid biofuels: Process characteristic and environmental implication," Renewable Energy, Elsevier, vol. 139(C), pages 707-717.
    6. Piotr Sakiewicz & Krzysztof Piotrowski & Mariola Rajca & Izabella Maj & Sylwester Kalisz & Józef Ober & Janusz Karwot & Krishna R. Pagilla, 2022. "Innovative Technological Approach for the Cyclic Nutrients Adsorption by Post-Digestion Sewage Sludge-Based Ash Co-Formed with Some Nanostructural Additives under a Circular Economy Framework," IJERPH, MDPI, vol. 19(17), pages 1-28, September.
    7. Di Liang & Yimin Li & Zhongning Zhou, 2022. "Numerical Study of Thermochemistry and Trace Element Behavior during the Co-Combustion of Coal and Sludge in Boiler," Energies, MDPI, vol. 15(3), pages 1-16, January.
    8. Xiao, Han-min & Ma, Xiao-qian & Lai, Zhi-yi, 2009. "Isoconversional kinetic analysis of co-combustion of sewage sludge with straw and coal," Applied Energy, Elsevier, vol. 86(9), pages 1741-1745, September.
    9. Li, Shiyuan & Xu, Mingxin & Jia, Lufei & Tan, Li & Lu, Qinggang, 2016. "Influence of operating parameters on N2O emission in O2/CO2 combustion with high oxygen concentration in circulating fluidized bed," Applied Energy, Elsevier, vol. 173(C), pages 197-209.
    10. Sever Akdağ, Ayşe & Atak, Onur & Atimtay, Aysel T. & Sanin, Faika Dilek, 2018. "Co-combustion of sewage sludge from different treatment processes and a lignite coal in a laboratory scale combustor," Energy, Elsevier, vol. 158(C), pages 417-426.
    11. Tan, Peng & Ma, Lun & Xia, Ji & Fang, Qingyan & Zhang, Cheng & Chen, Gang, 2017. "Co-firing sludge in a pulverized coal-fired utility boiler: Combustion characteristics and economic impacts," Energy, Elsevier, vol. 119(C), pages 392-399.

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