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Gasification is one of the methods of utilization of lignite. Studies on clean coal technologies are carried out on a wide scale in Poland and worldwide. One of the projects was "The Development of Coal Gasification Technology for High Production of Fuels and Energy? carried out under the framework of the National Centre for Research and Development. The project was based on the gasification of lignite from the Be?chat?w deposit. For syngas production, a circulating fluidized bed reactor and CO2 as the gasifying a...

Sulphur is one of the major constituents of lignite. In addition, it is used to measure the negative environmental impacts of this raw material. The presented study included field work and laboratory work. Field work was aimed at collecting coal samples, which were subjected to a series of laboratory tests. In total, about 150 coal samples were collected and used for proximate analysis. In addition, a large database of archival results from mines and scientific literature was collected. Overall, more than 4000 coa...

All the elements in the periodic table from polonium to uranium belong to the group of radioactive elements. Additionally, potassium isotopes (40 K) should also be included to the mentioned group. A number of studies have shown that coal has a moderate ability to concentrate radioactive elements, but this problem becomes more important in the case of coal ash, where the accumulation of these elements takes place. This is associated with the low volatility of uranium and thorium, of which only a small amount is rel...

The performances of the excavation machines depend largely on the tool and overall machine characteristics and on the other hand on physical mechanical characteristics of the excavated rock. There were more theories based on analytical deductions to explain the main cutting parameters on the basis of basic physical mechanical properties of the excavated rock. In this paper we use a new methodology, based on reliable laboratory data, which make possible to obtain correlation and regression formulas in order to pred...