TWO-DIMENSIONAL MODEL OF THE SOLID FUEL GASIFICATION IN A FIXED BED UNDER PRESSER. 1. INVESTIGATION OF SHUBARKOL COAL CONVERSION IN A STEAM-OXYGEN MIXTURE WITH THE MASS PART OF H2О/O2=45/55

Keywords: fixed bed, coal, thermal conductivity, steam-oxygen gasification, temperature.

Abstract

A non-stationary model of the steam-oxygen gasification of solid fuel in a fixed bed under pressure has been developed with allowance for the interphase convective heat exchange, radiation-conductive heat transfer of the solid phase, radiant and conductive heat exchange of the bed  with the reactor wall, heterogeneous and homogeneous chemical reactions, gravity and aerodynamic resistance. Temperature distribution of the phases, diameter of the coal particles, concentrations of the gas components over the bed height as a function of time during the gasification of Shubarkol long-flame coal under a pressure of 3 MPa at a ratio of mass fractions in the oxygen-oxygen mixture H2О/O2 = 45/55 is obtained. The obtained information can be used in the design of reactors, commissioning modes and the gas generator operation at various loads, when the process of steam-oxygen coal gasification is non-stationary due to the cyclical fuel supply and ash discharge by using a system of lock bins. It has been shown that the section of the oxidizing zone, where the temperature of the coal particles reaches its maximum value, is very narrow and is 10-11 mm. Two alternative modes of the gas generator operation are proposed. The first mode H2О/O2 = 40/60 is associated with an increase in the maximum temperature of the particles in a small area adjacent to the reactor bottom from to 1550 °C, which makes it possible to organize stable liquid slag removal from the gas generator. The second mode H2О/O2 = 72/28  is based on solid slag removal, when the temperature of the particles does not exceed 1000 °С. Referenses 11, tabl. 1, fig. 9.

Author Biography

B. Rokhman, Coal Energy Technology Institute NAS of Ukraine, 04070, Kyiv, str. Andreevskaya 19

Rokhman.jpgAuthor information: the leading researcher of the Institute of Coal Energy Technologies of the NAS of Ukraine, Doctor of Technical Sciences. Biographical information of Rohman B.B. is published in well-known world directories "Who's Who in Science and Engineering" and "2000 Outstanding Intellectuals of the 21st Century".
Education: Novocherkassk Polytechnic Institute.
Research area: Mathematical modeling of aerodynamics, heat and mass transfer and chemical reaction of a polydisperse ensemble of solid fuel in chamber and layer furnaces, in reactors with a circulating fluidized bed and in the fluidized bed.
Publications: more than 90 scientific papers, 27 of them are contained in the science-based Scopus database and 4 in the science-based  Web of Science database.

References

1. Aerov M. E., Todes O. M., Narinskiy D. Apparatyi so statsionarnyim zernistyim sloem. [Apparatus with a stationary granular bed]. Leningrad. USSR. Khimiya. 1979. 176 p. [in Rus-sian].
2. Rokhman B.B. Modeling and numerical investigation of the process of vapor-oxygen gasification of solid fuels in a vertical flow reactor under pressure. Journal of Ehgineering Physics and Thermopysics. 2014. Vol. 87. No. 5. Pp. 1103-1115. [in English].
3. Westbrook C.K., Dryer F.L. Simplified reaction mecha-nisms for the oxidation of hydrocarbon fuels in flames. Combust. Sci. Technol.. 1981. No. 27. Pp. 31-43. [in English].
4. Bustanmante F., Enick R.M, Killmeyer R.P, Howard B.H, Rothenberger K.S, Cugini A.V, Morreale B.D., Ciocco M.V. Un-catalyzed and wall-catalyzed forward water-gas shift reaction ki-netics. AIChE J. 2005. No. 51. Pp. 1440-1454. [in English].
5. Ma J., Zitney S.E. CFD modeling of entrained-flow gasi-fiers with improved physical and chemical submodels. Energy Fuels. 2012. No. 26. Pp. 7195-7219. [in English].
6. Gómes-Barea A., Leckner B. Modeling of biomass gasifi-cation in fluidized bed. Progress in Energy and Combustion Sci-ence. 2010. No. 36. Pp. 449-509. [in English].
7. Wen C. Y., Chaung T. Z. Entrainment Coal Gasification Modeling. Ind. Eng. Chem. Process Des. Dev.. 1979. Vol. 18. No. 4. Pp. 684-695. [in English].
8. Gräbner M. Industrial Coal Gasification Technologies Covering Baseline and High‐Ash Coal. Wiley. 2014. 384 p. [in English].
9. Nagornov A. N. Issledovanie i razrabotka tehnologii gazi-fikacii malozolnyh uglej v plotnom sloe pod davleniem pri pa-rovozdushnom dute. Avtoreferat dissertacii na soiskanie uchenoj stepeni kandidata tehnicheskih nauk. [Research and development of technology for gasification of low-ash coals in a dense bed under pressure with a vapor-air blast. Abstract of thesis for the degree of candidate of technical sciences]. Barnaul. Russia. 2010. 20 p. [in Russian].
10. Yoon H., Wei J., Denn M. A model for moving bed coal gasification reactors. AIChE J. 1978. Vol. 24. No. 5. Pp. 885-903. [in English].
11. Rokhman B.B. Modelirovanie teplomassoobmena i himicheskogo reagirovaniya gazodispersnogo potoka pylevidnyh chastic uglya v vysokotemperaturnom gazifikatore. [Modelling heat-and-mass transfer and chemical reaction of the gas-dispersed flow of the pulverized coal particles in a high-temperature gasifi-er]. Vidnovluvana energetika, 2016. No. 3. 13-26. [in Russian].

Abstract views: 64
PDF Downloads: 50
Published
2019-03-18
How to Cite
Rokhman, B. (2019). TWO-DIMENSIONAL MODEL OF THE SOLID FUEL GASIFICATION IN A FIXED BED UNDER PRESSER. 1. INVESTIGATION OF SHUBARKOL COAL CONVERSION IN A STEAM-OXYGEN MIXTURE WITH THE MASS PART OF H2О/O2=45/55. Vidnovluvana Energetika, (1(56), 61-71. https://doi.org/10.36296/1819-8058.2019.1(56).61-71