Numerical simulation for the steam gasification of single char particle
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ORIGINAL PAPER
Numerical simulation for the steam gasification of single char particle Vinod Kumar Yadav1,2 · Ravi Shankar3 · Vineet Kumar2,4 Received: 13 May 2020 / Accepted: 9 September 2020 © Institute of Chemistry, Slovak Academy of Sciences 2020
Abstract Simulation of a single char particle for the synthesis gas production is challenging task due to its complex chemical reactions coupled with the varying physicochemical properties during the gasification process. Steam gasification of a single char particle require the favourable conditions for the CO and H 2 enriched gas with minimum C O2 formation. Here, non-linear partial differential equation for the unsteady state diffusion-controlled reaction of a gasification agent (steam) inside the noncatalytic porous spherical char particle is numerically solved by staggered grid finite volume method with suitable boundary conditions. The steam gasification is numerically solved for the variable size char particle of two different diameters, i.e. 5 and 10 mm between the temperature range of 1000–1300 K. Gasification process at high-steam partial pressure suggests high H2 and CO concentration in the synthesis gases. Keywords Coal · Gasification · Steam · Staggered grid · Finite volume method (FVM)
Introduction Coals from different regions of the world have different characteristics in term of mineral content and carbon matrix. In high ash containing coals, beneficiation process is difficult for the mineral matter removal that leads to the lower efficiency and greater environmental pollution during coal combustion. The carbon dioxide emissions from the coal combustion leads to global warming that has led to the international agreement that sets the target for controlling CO2 emissions. To achieve these goals, it is required to enhance Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11696-020-01348-2) contains supplementary material, which is available to authorized users. * Ravi Shankar [email protected] 1
Department of Chemical Engineering, Government Polytechnic Gorakhpur, Gorakhpur, Uttar Pradesh 273012, India
2
Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
3
Department of Chemical Engineering, Madan Mohan Malaviya University of Technology Gorakhpur, Gorakhpur, Uttar Pradesh 273016, India
4
Department of Chemical Engineering, Indian Institute of Technology (ISM) Dhanbad, Dhanbad 826004, India
the energy efficiency by making changes in the combustion practices of solid fuel. In many countries, the coal reserves are in better condition than oil and natural gas (Chavan et al. 2012). Owing to this reason, countries like India, using coal-based energy option for their economy and approximately 70–80% of energy are based on the thermal (coal) power plants (Choudhary and Shankar 2012). These power plants unit generate considerable amount of C O2, which is responsible for major environmental pollution (Chandra and Chandra 20
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