Examination of steam gasification of coal with physically mixed catalysts

Abstract

The aim of this study was to analyse the steam gasification process of ‘Janina’ coal with and without Na-, K- and Ca-catalysts. The catalysts were physically mixed with the coal due to the simplicity of this method, short time of execution and certainty that the amount of catalyst is exactly as the adopted one. The isothermal measurements were performed at 800, 900 and 950°C and a pressure of 1 MPa using thermovolumetric method. The obtained results enabled assessment of the effect of analysed catalysts on the process at various temperatures by determination of: i) carbon conversion degree; ii) yield and composition of the resulting gas; and iii) kinetics of formation reactions of main gas components – CO and H2. The addition of catalysts, as well as an increase in operating temperature, had a positive effect on the coal gasification process – reactions rates increased, and the process time was reduced.

The Effect of Temperature-Pressure Conditions on the RDF Gasification in the Atmosphere of Steam and Carbon Dioxide

“…One can be observed that the share of calcium oxide, considered compounds that catalyse the gasification process [32], is the highest (above 40%). The ash also contains other catalytically active components (e.g., oxides of iron, potassium, magnesium and sodium [33,34]), but their shares are low. On the other hand, over 1/3 of the ash consists of compounds that have an adverse effect on gasification reaction, such as Al 2 O 3 , SiO 2 or P 2 O 5 [35,36].…”