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Co-firing of gas coal dust fine particles and synthetic peat gas. Part 1. Simulation of processes of steam-air gasification of peat in a fixed bed and combustion of dust and gas mix in a stream

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Category: Content №6 2021

Last Updated on 28 December 2021

Published on 28 December 2021

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Authors:

B.B.Rokhman, orcid.org/0000-0002-1270-6102, Thermal Energy Technology Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

N.I.Dunayevska, orcid.org/0000-0003-3271-8204, Thermal Energy Technology Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V.G.Vyfatnuik, orcid.org/0000-0003-0771-2652, Thermal Energy Technology Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

I.V.Beztsennyi, orcid.org/0000-0001-6536-5121, Thermal Energy Technology Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2021, (6): 057 - 065

https://doi.org/10.33271/nvngu/2021-6/057

Abstract:

Purpose. To build a model of solid fuel gasification in a fixed bed taking into account the velocity of particles, which allows obtaining detailed information about the technological process. To develop an optimal technological scheme of co-firing of pulverized coal particles and peat gas in the TPP-210A boiler. To investigate the process of a binary mix burning.

Methodology. The objects of research were pulverized coal of Ukrainian deposits and peat from Volyn region deposits. The developed model was used to calculate the peat gasification process. To study the process of burning a binary blend, ANSYS FLUENT package was used.

Findings. A model of solid fuel gasification in a fixed bed has been developed, which differs from the existing models by taking into account the particle velocity and its change. With the aid of this model the detailed information on temperature and concentration fields of the two-phase environment is received. The process of burning binary mix in a TPP-210A boiler is investigated.

Originality. It was found that in the time interval 2200 < < 3200 s a stable stationary process of thermochemical processing of peat with q_4.1 = 0.130.3% is formed. The profile of the dispersed phase velocity distribution resembles a mirror reflection of the profile of the particle diameter dependence.

Practical value. Using the constructed model, the process of thermochemical processing of 28939 kg/h of raw peat in three reactors with a fixed bed at a pressure of 1.5 MPa was numerically investigated. The composition of the generator gas at the reactor outlet was determined.

Keywords: fixed bed, coal, peat, thermal conductivity, steam-air gasification, conductive and radiative heat exchange

References.

1. Tiilikka, M., & Bolhr-Nordenkampf, M. (2014). Advanced Gasification Technologies for Large Scale Energy Production. Power-Gen Europe Conference, 1, 1-16.

2. Rokhman, B., & Nekhamin, M. (2020). Theoretical study of nonstationary air gasification of solid fuel in a fixed bed at atmospheric pressure. Vidnovluvana Energetyka, 1(60), 86-95. https://doi.org/10.36296/1819-8058.2020.1(60).86-95.

3. Nagornov, A.N. (2020). Results and development of gasification technologies of low-ash coal in a pressurized dense bed with a steam-air blowing (Abstract of a doctoral thesis of Technical Sciences).

4. Alekseev, M.V., Bogomolov, A.R., Pribaturin, N.A., Shevyrev,S.A., Sorokin, A.L., & Kagakin, E.I. (2013). Modeling of a layerwise gas counterflow gasifier for conversion of sludge TSOF Berezovskaya in a flow of overheated steam. Vestnik Kuzbasskogo gosudarstvennogo universiteta, 79-84.

5. Taimasov, D.R., Permyakov, E.E., Ulzysayhan, Hudryoe, & Senachin, P.K. (2017). Coal gasification in the dense bed of the reversed process gas generator. Polzunovsky almanac, 3(1), 24-27.

6. Maryishin, N.S., Timasov, D.R., Permyakov, E.E., & Senachin,P.K. (2017). Modeling gasification in a dense bed. Energo and resource-efficiency of low-stored buildings. Materials, 338-342.

7. Han, W., & Gou, X. (2020).Improved path flux analysis mechanism reduction method for high and low temperature oxidation of hydrocarbon fuels. Combustion Theory and Modelling, 24(6), 1090-1107.https://doi.org/10.1080/13647830.2020.1820577.

8. Nnabuo, N., Salama, A., & Ibrahim, H. (2020).CFD investigation of biogas reformate using membrane-assisted water gas shift reaction: parametric analyses. Chemical Engineering Research and Design. https://doi.org/10.1016/j.cherd.2020.07.023.

9. Ma, J., & Zitney, S.E. (2012). CFD modeling of entrained-flow gasifiers with improved physical and chemical submodels. Energy Fuels, 26, 7195-7219.

10. Gmes-Barea, A., & Leckner, B. (2010). Modeling of biomass gasification in fluidized bed. Progress in Energy and Combustion Science, 36, 449-509.

11. Watanabe, H., & Kurose, R. (2020).Modeling and simulation of coal gasification on an entrained flow coal gasifier. Advanced Powder Technology. https://doi.org/10.1016/j.apt.2020.05.002.

12. Gerasev, A.P. (2017). Modeling of mass transfer in apparatuses with a stationary granular bed taking into account the phase temperature difference. Theoretical Foundations of Chemical Engineering, 51(3), 320-326. https://doi.org/10.1134/s0040579517030046.

13. Schneiderbauer, S., & Saeedipour, M. (2018). Approximate deconvolution model for the simulation of turbulent gas-solid flows: An a priori analysis. Physics of Fluids, 30(2), 023301. https://doi.org/10.1063/1.5017004.

14. Nikolaev, A.K., Dokoukin, V.P., Lykov, Y.V., & Fetisov, V.G. (2018). Research of processes of heat exchange in horizontal pipeline. IOP Conference Series: Materials Science and Engineering, 327, 032041. https://doi.org/10.1088/1757-899x/327/3/032041.

15. Pinto, R.N., Afzal, A., DSouza, L.V., Ansari, Z., & Mohammed Samee, A.D. (2016). Computational Fluid Dynamics in Turbomachinery: A Review of State of the Art. Archives of Computational Methods in Engineering, 24(3), 467-479. https://doi.org/10.1007/s11831-016-9175-2.

16. L, D., Bai, Y., Wang, J., Song, X., Su, W., Yu, G., , Tang, G.-J. (2021). Structural features and combustion reactivity of residual carbon in fine slag from entrained-flow gasification. Journal of Fuel Chemistry and Technology, 49(2), 129-136. https://doi.org/10.1016/s1872-5813(21)60011-7.

17. Mularski, J., & Modliski, N. (2020). Entrained flow coal gasification process simulation with the emphasis on empirical devolatilization models optimization procedure. Applied Thermal Engineering, 115401. https://doi.org/10.1016/j.applthermaleng.2020.115401.

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