Modeling of gasification process of Indian coal in perspective of underground coal gasification (UCG)
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Modeling of gasification process of Indian coal in perspective of underground coal gasification (UCG) Ramesh Naidu Mandapati1 · Praveen Ghodke2 Received: 25 January 2019 / Accepted: 9 September 2019 © Springer Nature B.V. 2019
Abstract In the present study, the steam gasification of Indian coal and its demineralized coal were investigated in a specially designed fixed-bed reactor, to determine the intrinsic kinetics parameters with optimum operating temperature and partial pressures of steam in the perspective of underground coal gasification (UCG). The gasification reactivity of a chosen coal was higher compared to the demineralized coal and the reason could be mineral content of ash present in the coal. A one-dimensional unsteady kinetic model was developed for the steam gasification process in a fixed-bed reactor. The intrinsic kinetic parameters for steam gasification and water–gas shift reaction are estimated by fitting the developed models with the experimental data. Keywords Indian coal · Demineralized coal · Steam gasification · Water–gas shift reaction · Kinetics · Modeling Abbreviation C Total molar concentration (mol m−3) CJ Molar concentration of species J (mol m−3) 2O (atm−1) K1 Adsorption coefficient of H 2 (atm−1) K2 Adsorption coefficient of H L Length of bed (m) P Total pressure (atm) PH2 O Partial pressure of H2O (atm) PH2 Partial pressure of H2 (atm) O2 (atm) PCO2 Partial pressure of C PCO Partial pressure of CO (atm) R Universal gas constant (J mol−1 K−1) * Praveen Ghodke [email protected] Ramesh Naidu Mandapati [email protected] 1
Department of Chemical Engineering, Vignan’s Foundation for Science, Technology & Research, Vadlamudi, Andhra Pradesh 522213, India
2
Department of Chemical Engineering, School of Engineering, University of Petroleum and Energy Studies (UPES), Dehradun, Uttarakhand 248007, India
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S0 Initial surface area of char (m2 g m−1) T Temperature (K) V Volume of the bed ( m3) Y Mole fraction YH2 O Mole fraction of H2O 2 YH2 Mole fraction of H O2 YCO2 Mole fraction of C YCO Mole fraction of CO k0 Pre-exponential factor (atm−1 s−1) k1 Arrhenius rate constant ( atm−1 s−1) kf Forward rate constant (mol m−3 atm−2 s−1) kb Backward rate constant (mol m−3 atm−2 s−1) t Time (s) v Volumetric flow rate (m3 s−1) x Local conversion of char x Average conversion of char z Space (m) 𝛾SG Rate of steam gasification (mol m−3 s−1) 𝛾WGS Rate of water–gas shift reaction (mol m−3 s−1) 𝜌CO Initial molar density of char (mol m−3) 𝜌C The molar density of char (mol m−3) 𝜀0 Initial porosity of char 𝜓 Initial structural parameter of char
1 Introduction Gasification is a proven technology where solid fuels are directly converted into gaseous fuel. The coal which is not mineable or lies too deep underground or otherwise too costly to exploit using conventional mining techniques; UCG can be implemented. UCG is current focused technology where un-mineable coal is utili
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