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Successful Preheating of Pulverized Hard Coal and Lignite for Blast Furnace PCI
Author(s) -
Splittgerber Frank,
Lahr Jens,
Haustein Nicole,
Lychatz Bernd
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500451
Subject(s) - pulverized coal fired boiler , blast furnace , coal , fluidized bed , materials science , context (archaeology) , metallurgy , waste management , nuclear engineering , environmental science , process engineering , engineering , geology , paleontology
In the context of the development of a preheating procedure for injection coal, investigations are made in order to determine the heat transmission coefficient for a fluidized bed preheating technology. This should provide answers to the questions whether the procedure is able to fulfill the requirements of blast furnace operation and whether the required throughputs of 60 t h −1 of preheated pulverized hard coal (PC) and pulverized lignite (PL), respectively, with temperatures between 150 and 220 °C can be realized. The necessary data are determined by experiments using two samples, one of hard coal and one of lignite in a fluidized bed preheating plant at the laboratory of the E.S.C.H. GmbH. The heat transmission coefficients are determined between 350 and 800 W m −2 K −1 which account for residence times of about 5 min at temperatures between 170 and 190 °C. In addition, the water content of the PL is reduced from about 9.5 wt% to less than 1 wt%. Based on the results, it can be estimated that the required throughputs can be achieved by preheating in the fluidized bed. Thus, the preheating procedure can be integrated into the E.S.C.H. Pulverized Coal Injection (PCI) technology.