Coal pyrolysis under synthesis gas, hydrogen and nitrogen

Coal pyrolysis in a fluidized bed reactor simulating the process conditions of coal topping in CFB boiler

“…Several research groups [20][21][22][23][24][25] reported an obvious increase of the pyrolysis oil yield with increasing the H 2 content in the reaction atmosphere, while others [14,26] found that the inclusion of H 2 decreased the pyrolysis oil yield, although it improved the quality of the pyrolysis oil. Table 3 compares the major literature reports and working conditions (including reactor type and heating rate) for investigating the influence of H 2 on pyrolysis oil yield.…”

Continuous high-temperature fluidized bed pyrolysis of coal in complex atmospheres: Product distribution and pyrolysis gas

“…1a where the recycled pyrolysis gas is burnt. There are some literature studies about the atmospheric-gas influence on coal pyrolysis [3][4][5][6][7][8][9][10][11][12]. Braekman-Danheux et al [4,5] studied the influence of coke oven gas components on product yields and char characteristics in a fixed bed reactor.…”

“…They reported that the char obtained in a coke oven gas atmosphere was not fundamentally different from those in pure hydrogen or pure inert atmosphere, while the overall conversion and oil yield were lower than in pure hydrogen but higher than in helium. Also in a fixed bed reactor of atmospheric pressure, Ariunaa et al [6] found that there was slight difference in the yields of char and tar under varied atmospheric-gas compositions for lignite at temperatures of 400 to 800 • C. Liao et al [7] revealed that the higher pressure and slower heating rate increased the pyrolysis oil yield and improved the oil quality when testing the pyrolysis in a pressurized fixed bed reactor. They also concluded that the conversion and oil yield of coal pyrolysis in coke oven gas and synthesis gas were higher than those from hydropyrolysis at the same H 2 partial pressure.…”

Pyrolysis of pine wood and characterisation of solid and liquid products

“…Its chemical composition was determined by the XRF analysis and the results are given in Figure 3 and Table 4 respectively. The data in Table 4 show that the content of S (SO 3 .09 was more than one (>1.0) and this value is an indication that the ash of pine wood has a basic (alkaline) character. Also the ash of pine wood was a subject for XRD analysis and the results are given in Figure 4 and Table 5 respectively.…”