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The efficiency and flexibility of the BL gasification process may improve by mixing BL with more energy-rich fuels such as pyrolysis oil (PO). To improve understanding of the fuel conversion process, blends of BL and PO were studied in an atmospheric drop tube furnace. Experiments were performed in varying atmosphere (5% and 0% CO2, balanced by N2), temperature (800–1400°C), particle size (90–200μm...
Gasification is a promising alternative for polymeric waste valorization when mechanical recycling is unfeasible on account of its heterogeneity or partial contamination, or simply when it yields a product of lower quality than what the market requires. Apart from its application for electricity generation, the waste-derived syngas shows a great potential for chemical waste recycling for the synthesis...
Compared with individual pyrolysis of Shendong coal or the direct coal liquefaction residue, co-pyrolysis has an improved tar yield. However, the synergistic mechanism in the integrated process is still controversial. In order to explore the interactive effect in co-pyrolysis of coal and the direct coal liquefaction residue, elemental analysis, gas chromatography, Fourier – transform infrared spectrometer,...
This article presents an overview on carbon chemical structure transformation to understand kerogen thermal decomposition based on the chemical structure of kerogen. Formation of kerogen is highlighted to distinguish the typical types of kerogen containing in oil shale and coal. The oil production potential for oil shale and coal is found to little correlate with their organic amounts but to depend...
In contrast with thermogravimetric analyzer (TGA), where the samples stacked in the crucible inhibit the release of primary pyrolysis products that subsequently undergo secondary pyrolysis, and fluidized beds which fail to provide precise data on the yields of pyrolysis products without secondary reactions, the wire-mesh reactor (WMR) effectively avoids secondary pyrolysis and provides more accurate...
Tar formation and CO2 emission represent the strongest barrier for use of gasification technology for biomass conversion, whereas sufficing for both is only possible with expensive physical methods and further chemical processing. The use of CaO as a CO2 sorbent within an advanced high-temperature gasification system is able to achieve efficient cracking of the tars to the primary syngas with low...
Coal pyrolysis process is accompanied by free radical generation, stabilization and condensation. Free radical concentration plays a crucial role in pyrolysis product distribution. Hydrothermal treatment of lignites is used as a pretreatment method to regulate pyrolysis product distribution analyzed by free radical reaction mechanism. The free radical concentration in lignite and char was monitored...
This paper presents the results of six tar sample analyses obtained during 60days of an underground coal gasification (UCG) trial in the “Wieczorek” mine in Poland. The tars were sampled periodically during coal gasification by four different reagents: oxygen enriched air, air, a mixture of air and carbon dioxide, and air with nitrogen. The tar samples were analysed over a wide range of physico-chemical...
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