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Prediction of coking dynamics for wet coal charge

Kardaś D., Polesek-Karczewska S., Ciżmiński P., Stelmach S.

Chemical and Process Engineering

2015

Vol. 36, nr 3

291--303

A one-dimensional transient mathematical model describing thermal and flow phenomena during coal coking in an oven chamber was studied in the paper. It also accounts for heat conduction in the ceramic oven wall when assuming a constant temperature at the heating channel side. The model was solved numerically using partly implicit methods for gas flow and heat transfer problems. The histories of temperature, gas evolution and internal pressure were presented and analysed. The theoretical predictions of temperature change in the centre plane of the coke oven were compared with industrialscale measurements. Both, the experimental data and obtained numerical results show that moisture content determines the coking process dynamics, lagging the temperature increase above the water steam evaporation temperature and in consequence the total coking time. The phenomenon of internal pressure generation in the context of overlapping effects of simultaneously occurring coal transitions – devolatilisation and coal permeability decrease under plastic stage – was also discussed.

Synergy analysis of vaporisation processes

Hoffmann V. V. I., Huminic G.

International Journal of Applied Mechanics and Engineering

2004

Vol. 9, no 4

701-713

In this paper, the authors present a new expression of the vaporisation heat in the case of isobar-isothermal processes, the identification of the components of the vaporisation heat and the correct description of the phenomena, which are happening at the critical state.