Physical and chemical properties of selected Turkish lignites and their pyrolysis and gasification rates determined by thermogravimetric analysis

Effect of operating parameters on coal gasification

“…Several researchers (Alvarez et al 1994;Ahn et al 2001;Zhang et al 2006;Cakal et al 2007;Liu et al 2008;Everson et al 2008;Fouga et al 2011;Tanner and Bhattacharya 2016;Wang et al 2015) have studied kinetic behavior of coal gasification using different kinetic models. They have used different raw materials and various operating conditions.…”

Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review

“…Ye et al [4] treated the low-rank coal with an acid and removed all the cations from the coal and observed that reactivity of the low-rank coal was about the same as to the high-rank coal [16]. Cakal et al [6] used four different lignite samples (Elbistan, Soma, Seyitomer, and Tuncbilek) under the CO 2 stream at two different temperatures 875 C and 1000 C in a TGA apparatus and observed that Elbistan coal was highly active. The order of reactivity sequence at these temperatures was given as Elbistan > Soma > Seyitomer > Tuncbilek.…”

“…CO 2 is not used industrially as much as steam in the gasification or activation processes but it is the preferred agent used at laboratory level and CeCO 2 reaction is of great importance. The slower reaction rate at temperatures around 723 C allows a better control of the gasification process and analysis of the different variables [6]. The effect of pressure on char-CO 2 gasification has been extensively studied by numerous researchers [9,35,39,43,51,156,172e174] and modern theories are proposed under atmospheric pressure conditions [175,176].…”

Sensitivity analysis of different devolatilisation models on predicting ignition point position during pulverized coal combustion in O2/N2 and O2/CO2 atmospheres

“…TGA techniques are widely used to determine coal ignition behaviour [13][14][15][16][17]. However TGA analysers operate under very different conditions from those encountered in pilot-scale and industrial furnaces.…”

“…Here only the main elements will be shown: (1) secondary oxidant supply, (2) primary oxidant supply, (3) secondary oxidant duct with super kanthal wire heater, (4) insulation modules with kanthal wire heater, (5) coal powder feeder, (6) pulverized coal À primary oxidant duct, (7) primary oxidant À coal inlet, (8) secondary oxidant inlets, (9) furnace, (10) control thermo couples, (11) quartz glass tube, (12) spotlights, (13) high-speed digital image recorder, (14) gas/ash sampling probe, (15) exhaust, (16) ventilator, and (17) outlet, Fig. 1.…”