Ispitivanja šarži na propusnost plina u procesu redukcije željezne rude krutim ugljenom

An increased interest in new methods of pig iron production, which do not require the use of coke, leads to searches for substitutes of coke as the reducing agent. Hard coal is gaining an increasing importance in these searches, as its resources in the world’s deposits presently known should be sufficient for the next 300 to 500 years, whereas the resources of petroleum or natural gas are estimated to suffice only for a few dozens of years. This is particularly true for Poland, where the difference in the respective resources indicates even more clearly the need of using hard coal as a reducing agent. The purpose of the study was to investigate the change of the gas permeability of different types of coal as a result of phenomena occurring in the processes of reduction of iron ores, in order to evaluate the suitability of various Polish coals for these processes. The article describes the methodology of examination of the gas permeability of a hard coal bed in a stream of hot reduction gases. Tests were performed in a model testing furnace. As the test material, hard coal types 32, 33 and 34 from selected Polish coal mines were used.Sve veće zanimanje za nove metode proizvodnje sirovog željeza koje ne traže uporabu koksa vodi do traženja redukcijskog sredstva. U tim traženjima kruti ugljen zadobiva sve veću važnost jer su njegova nalazišta u svijetu, za koja trenutno znamo, dovoljna za slijedeći 300 - 400 godina, dok su rezerve nafte ili zemnog plina dovoljne za samo nekoliko decenija. To posebno važi za Poljsku gdje su nalazišta takva da još jasnije ukazuju na potrebu uporabe tvrdog ugljena kao redukcijskog sredstva. Cilj ovog rada je bio da se ispita propusnost različitih vrsta ugljena kao rezultat fenomena koji se pojavljuju u procesu redukcije željeznih ruda. Kao ispitni materijal koristio se kruti ugljen tipa 32, 33 i 34 iz odabranih poljskih rudnika. Članak ispituje metodologiju ispitivanja propusnosti na plin posteljice tvrdog ugljena u struji vrućih redukcijskih plinova