NDLI: Investigation of Potential Benefits of Using Bricks of High Thermal Capacity and Conductivity in a Rotating Calcining Kiln

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhao, Lei Wang, Ting
Copyright Year	2008
Abstract	Petroleum coke is processed into calcined coke in a rotary kiln, where the temperature profiles of flue gas and coke bed are highly nonuniform due to different flow and combustion mechanisms. Motivated by saving energy costs, the effect of refractory brick’s thermal properties on potential energy savings is investigated. This study focuses on investigating potential energy savings by replacing inner one third of existing bricks with higher thermal capacity (Cp) and/or higher thermal conductivity (k) bricks. This investigation is motivated by postulating that the bricks with higher thermal capacity can store more thermal energy during the period of contacting with the hot gas and release more heat to the cock bed when the bricks rotate to below and in contact with the coke bed. A rotational, transient marching conduction numerical simulation is conducted using the commercial software FLUENT. The impact of brick heat capacity and thermal conductivity on transporting thermal energy to the coke bed is analyzed. The results show: (a) Increasing the heat capacity of brick layer reduces brick temperature which helps increase the heat transfer between the hot gas and brick, in other words it does help brick store more heat from the hot gas, but, heat transfer between brick and coke is reduced, which is opposite to the original postulation. (b) Higher brick thermal conductivity decreases brick temperature thus increases heat transfer between hot gas and the brick layer. The heat transfer from brick to coke bed is also increased, but not significantly. (c) Usually a brick with a higher Cp value also has a higher k-value. Simulation of a brick layer with both four times higher Cp and k values actually show appreciable heat is transported from the brick to the coke bed for one rotation for both lower and higher Cp and k bricks. The difference is not significant.
Sponsorship	Heat Transfer Division
Starting Page	729
Ending Page	740
Page Count	12
File Format	PDF
ISBN	9780791848470
DOI	10.1115/HT2008-56455
e-ISBN	0791838323
Volume Number	Heat Transfer: Volume 1
Conference Proceedings	ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
Language	English
Publisher Date	2008-08-10
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Roasting (metallurgy) Computer software Coke Combustion Rotary kilns Temperature profiles Heat conduction Thermal conductivity Potential energy Kilns Thermal energy transport Computer simulation Bricks Heat capacity Flow (dynamics) Rotation Petroleum Thermal energy Transients (dynamics) Thermal properties Heat Simulation Flue gases Heat transfer
Content Type	Text
Resource Type	Article

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