Performance modeling of radiant heat recovery exchangers for rotary kilns

Heat loss from rotating kilns may represent a significant percentage of the total energy input especially in highly energy intensive industrial sectors such as cement production. As an alternative to traditional energy recovery methods, the possibility of recovering radiant heat lost through the kil...

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Bibliographic Details
Published in:Applied thermal engineering 2011-10, Vol.31 (14), p.2578-2589
Main Authors: Caputo, Antonio C., Pelagagge, Pacifico M., Salini, Paolo
Format: Article
Language:English
Subjects:
Applied sciences
Cement kiln
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Engineering Sciences
Equipment costs
Exact sciences and technology
Heat exchangers
Heat exchangers (included heat transformers, condensers, cooling towers)
Heat recovery exchanger
Heat transfer
Kilns
Mathematical model
Mathematical models
Mechanics
Physics
Recovering
Rotary kiln
Rotary kilns
Rotating
Shells
Theoretical studies. Data and constants. Metering
Thermics
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Summary:Heat loss from rotating kilns may represent a significant percentage of the total energy input especially in highly energy intensive industrial sectors such as cement production. As an alternative to traditional energy recovery methods, the possibility of recovering radiant heat lost through the kiln surface has been proposed in the literature. This may be accomplished by surrounding the kiln with a secondary external shell acting as a heat exchanger for a transfer fluid. In this work a mathematical model for sizing and performance estimation of a heat exchanger recovering waste heat from the external surface of rotating kilns is developed. The equipment has been configured as an array of pressurized water carrying tubes arranged in a longitudinal pattern on the surface of a cylindrical outer shell coaxial with the rotary kiln. An example of model application is utilized to discuss the involved heat transfer process and its impact on equipment design. An economic model has also been developed to determine the optimal size of the equipment. ► The problem of recovering heat lost from external surface of rotary kilns is discussed. ► A mathematical model of heat recovery exchangers for rotary kilns is developed. ► Heat exchange mechanisms and heat recovery performances bounds are discussed. ► A cost model and criteria for determining optimal equipment size are developed.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2011.04.024