Comparison of chosen gasification systems for solid fuels and biomass in termsof obtaining hydrogen for small application / Władysław Mitianiec // W: Proceedings of the 6th International Conference on ... więcej

Comparison of chosen gasification systems for solid fuels and biomass in termsof obtaining hydrogen for small application / Władysław Mitianiec // W: Proceedings of the 6th International Conference on Contemporary Problems of Thermal Engineering, Poland, online, 21-24 September, 2020 [Dokument elektroniczny] / ed. by Wojciech Stanek, Paweł Gładysz, Sebastian Werle, Lucyna Czarnowska. – Gliwice : Institute of Thermal Technology Silesian University of Technology, 2020. – Pamięć USB. – S. 453-467 : rys., schem., tab. – Bibliogr. 25 poz., Abstr. – ISBN 978-83-61506-54-6

Current requirements concerning the clean combustion technology both in automotive sector and energy industry force to search fuels with small molar concentration of carbon and sulphur. One of the best ... więcej

Current requirements concerning the clean combustion technology both in automotive sector and energy industry force to search fuels with small molar concentration of carbon and sulphur. One of the best methods to obtain gaseous fuels is gasification of solid fuels and biomass together with municipal sewage. Dispersion of energy production requires smaller gasification reactors for local applications. The paper presents various small gasification systems with water-coal mixture and water-biomass mixture both with oxygen (air) and without oxygen. Mathematical modelling together with 13 kinetic chemical reactions enabled to apply them in CFD program. The chemical model is based on surface reactions given in the model of Equivalent Reactor Network (ERN) in Ansys Energetico . Simulation of gasification of different reactor designs enabled to obtain the mass concentration of chemical compounds on the outlet of the system. The work includes also general flow of the fluid inside gasifier. Increasing of internal turbulence inside the gasification system gives better and quicker gasification process than in the stationary flow about 30%. Additionally, heating of the gasifier walls by electrical system without air gives higher mass ratio of hydrogen (0.13) and carbon monoxide (0.55) at the outlet than in the system with the air. The air consumes some part of the fuel and a lot of carbon dioxide is produced. The paper shows comparison of mass concentration of CO, H2, H2O, H2S, CO2, O2, CH4, tar, C(s) and other chemical compounds in the syngas for solid fuels and municipal sewage. Computation of different gasification systems enabled to choose the best system to obtain higher concentration of hydrogen in the syngas. Generally, turbulence and internal heating of the water-fuel mixture enables higher concentration of hydrogen in the syngas. Application of the gasification reactor with external heated walls and without oxygen inflow produces the syngas without tar and volatile species in comparison to the systems with additional oxygen supply. In all considered cases the syngas contained a large amount of CO2 about 25 – 30% of total mass. Such system will be used in one of polish small enterprise for fuelling of special industrial piston engine. This article is the result of research work carried out in the project financed by polish National Centre of Research and Development.