Performance modeling of radiant heat recovery exchangers for rotary kilns

Caputo, Antonio Casimiro; Pelagagge, Pacifico M.; Salini, P.

doi:10.1016/j.applthermaleng.2011.04.024

Cited by 37 publications

(15 citation statements)

References 3 publications

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“…Heat transfer in such systems and particularly in gas‐grain mixtures is an important physical phenomenon which may govern a wide variety of natural systems (e.g. volcanic eruption) and industries (rotary kilns devoted to asphalt or cement production, torrefaction of biomass, fertilizer production, waste treatment, and manufacturing of nuclear fuel). This phenomenon is quite complex for several reasons …”

Section: Introductionmentioning

confidence: 99%

Heat convection and radiation in flighted rotary kilns: A minimal model

et al. 2016

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We propose a minimal model aiming to describe heat transfer between particles (i.e. grains) and gases in a model of flighted rotary kilns. It considers a channel in which a convective gas interacts with a granular suspension and a granular bed. Despite its simplicity it captures the main experimental findings in the case of dilute suspension of heavy grains typical of what can be observed in many industrial rotary kilns. Energy balance between each phase takes into account the main heat transfer mechanisms between the transverse granular motion and the convective gas. In the absence of radiation heat transfer, the model predicts exponential variations of the temperatures characterized by a length which depends on the granular and gas heat flow rates as well as on the exchange areas. When radiation is taken into account, the model can be solved numerically. For this case, the temperature variations can be fitted by stretched exponentials whose parameters are found to be independent of the studied phases. Finally, an efficiency criterion is proposed to optimize the length of the system

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Section: Introductionmentioning

confidence: 99%

Heat convection and radiation in flighted rotary kilns: A minimal model

et al. 2016

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“…The kiln surface may reach a temperature exceeding 400°C and is another important heat loss source. Heat losses by convection and radiation may comprise about 8-15% of input energy [6,7,17,18]. Rotary kilns emit significant amounts of heat on the radiation route, that may be usefully exploited, for i.e.…”

Section: Radiating Exchangermentioning

confidence: 99%

“…The heat exchanger : a) in tube arrangement located coaxially on the external layer of the rotary kiln, b) in the arrangement of bent tubes[18].…”

mentioning

confidence: 99%

Using the adsorption chillers for utilisation of waste heat from rotary kilns

et al. 2018

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Waste heat utilisation and its reclamation is important for increasing the efficiency of the electric power production and for decreased consumption of primary energy. Waste heat can be utilised for the electric power production or for manufacturing and processing purposes. According to long-term forecasts, the consumption of electric power with current consumption of about 150 TWh, can be increased to about 230 TWh in around 2040, what may lead to the increased energy consumption from fuels and the increased emission of harmful contaminants to the atmosphere. The cement subsector, next to the glass industry, is among the most power-consuming industries, and it consumes about 12-15% of total energy consumed by industry in total, whereas the CO 2 emission from such industry exceeds about 5% in worldwide scale. In the cement sector, there is an increasing need for useful reclamation of waste energy, in order to obtain high energy-saving factors, and hence the financial and environmental benefits. In this paper the chances for waste energy reclamation from a rotary kiln are presented, with means of the used adsorption chillers.

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“…2 at SMZ Jelsava, a.s.: 14 % of the total energy expenditure for the burning process. The waste heat from the rotary furnace shell has until now been used only as a secondary effect on water heating [7,8] improve the operational, economic and environmental indicators in the production of sintered magnesite in rotary furnaces. The operating conditions were used for a simulation model (Table 1).…”

Section: Analysis Of the Current Statementioning

confidence: 99%

Effective Use of Rotary Furnace Shell Heat

Lišuch¹,

Dorcak²,

Spišák³

2014

Acta Polytech

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<pre><pre>Significant proportion of the total energy expenditure for the heat treatment of raw materials are heat losses through the shell of rotary furnace. Currently, the waste heat is not used in any way and escapes into the environment. Controlled cooling system for rotary furnace shell (<span>CCSRF</span>) is a new solution integrated into the technological process aimed at reducing the heat loss of the furnace shell. Based on simulations and experiments carried out was demonstrated a significant effect of controlled cooling shell to the rotary furnace work. The proposed solution is cost-effective and operationally undemanding.</pre></pre>

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Performance modeling of radiant heat recovery exchangers for rotary kilns

Cited by 37 publications

References 3 publications

Heat convection and radiation in flighted rotary kilns: A minimal model

Heat convection and radiation in flighted rotary kilns: A minimal model

Using the adsorption chillers for utilisation of waste heat from rotary kilns

Effective Use of Rotary Furnace Shell Heat

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