Numerical and experimental thermal analysis of a tunnel kiln used in ceramic production

Nicolau, Vicente de Paulo; Dadam, Alessandro P.

doi:10.1590/s1678-58782009000400003

Cited by 37 publications

(19 citation statements)

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“…Then, it is possible to propose alternatives to obtain better quality products, as well as to reduce processing the time and energy consumption. Several studies of thermal analysis in kilns can be found in the literature [32][33][34][35][36][37][38][39][40][41][42][43][44].Yu [32] developed a transient mathematical model for tunnel kilns. Using the model, the author was able to predict several parameters of the process, such as the temperature distribution in parts, energy consumption, heat losses, rate at which energy is accumulated, etc.…”

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confidence: 99%

Natural Gas Intermittent Kiln for the Ceramic Industry: A Transient Thermal Analysis

et al. 2019

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Drying and firing of ceramic products are processes that require high energy consumption. Making these processes more efficient can improve product quality, reduce processing time and energy consumption, and promote economic and environmental gains. In this sense, this work aims to quantify heat transfer in an intermittent ceramic kiln during the heating and cooling stages, with and without thermal insulation. All mathematical formulation is based on the first law of thermodynamics. From the results, we conclude that the greatest heat loss occurs by radiation in the sidewalls of the equipment, and that a considerable amount of energy is required to heat the sidewalls, base, and ceiling of the kiln. Further, with the use of thermal insulation, it was concluded that a high reduction in the heat lost through the sidewalls was achieved, thus providing a global energy gain of approximately 35% and a reduction in the maximum external surface temperature from 249.34 to 79.47 °C when compared to the kiln without thermal insulation, reducing the risks of work accidents and thermal discomfort when in operation.

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confidence: 99%

Natural Gas Intermittent Kiln for the Ceramic Industry: A Transient Thermal Analysis

et al. 2019

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“…Heat transfer by radiation between i and j real zone in tunnel furnace is given by (10) and by convection according (11).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…. σ (10) and convection heat transfer by (11) (11) where σ Stefan's Boltzmann constant (σ = 5,6703.10 −8 (W.m -2 K -4 )), T -temperature (K), S − surface (m 2 ), TA ij , TA jitotal heat exchange surface between i-th and j-th zone, α − convective coefficient (Wm -2 K -1 ), S − surface (m 2 ), T i gtemperature of gas medium at i zone (°C).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The relationship between the fuel consumption and heat storage rate in wares and in the lining bricks of kiln cars were also studied [9]. The results of the present numerical simulations [10], [11] show that, by using the present models, we can predict the following parameters: temperature distributions in wares and in lining bricks and in metal parts of kiln cars; fuel consumption; heat losses; heat storage and heat storage rates in wares, in lining bricks, and in metal parts of kiln cars; gas flow; and exhaust components. The present results disclose that the dynamic characteristic of a tunnel kiln is dominated by the transient heat conduction in wares and in lining bricks.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of burner's range of tunnel furnace by simulation

Kostúr

2014

Proceedings of the 2014 15th International Carpathian Control Conference (ICCC)

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Tunnel furnace belongs between thermal devices with big energy consumption. Therefore constructers and users are interested about some possibilities to decrease energy consumption in this group of thermal devices. One way for this aim appears the analysis building or rebuilding tunnel furnace by evaluation by simulation cases. In paper will be described mathematical model of tunnel furnace as basic tool for the creating simulation model. Mathematical model is given by based equations describing thermal processes by heat conducting, convection and radiation in tunnel furnace. Then will be presented an optimization of burner's range by simulations with aim to minimize the energy consumption to manufacture subjects.

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“…The numerical simulation becomes a valuable tool in investigating the performance of complex physical systems including different physical phenomena. In [6] a numerical model has been proposed and implemented into a Fortran routine for evaluating the temperature distribution within the walls, gas and tiles along the kiln under steady state assumption.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of an entire ceramic kiln under actual operating conditions for the energy efficiency improvement

Milani

Montorsi

Stefani

et al. 2017

Journal of Environmental Management

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The paper focuses on the analysis of an industrial ceramic kiln in order to improve the energy efficiency and thus the fuel consumption and the corresponding carbon dioxide emissions. A lumped and distributed parameter model of the entire system is constructed to simulate the performance of the kiln under actual operating conditions. The model is able to predict accurately the temperature distribution along the different modules of the kiln and the operation of the many natural gas burners employed to provide the required thermal power. Furthermore, the temperature of the tiles is also simulated so that the quality of the final product can be addressed by the modelling. Numerical results are validated against experimental measurements carried out on a real ceramic kiln during regular production operations. The developed numerical model demonstrates to be an efficient tool for the investigation of different design solutions for the kiln's components. In addition, a number of control strategies for the system working conditions can be simulated and compared in order to define the best trade off in terms of fuel consumption and product quality. In particular, the paper analyzes the effect of a new burner type characterized by internal heat recovery capability aimed at improving the energy efficiency of the ceramic kiln. The fuel saving and the relating reduction of carbon dioxide emissions resulted in the order of 10% when compared to the standard burner.

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Numerical and experimental thermal analysis of a tunnel kiln used in ceramic production

Cited by 37 publications

References 1 publication

Natural Gas Intermittent Kiln for the Ceramic Industry: A Transient Thermal Analysis

Natural Gas Intermittent Kiln for the Ceramic Industry: A Transient Thermal Analysis

Optimization of burner's range of tunnel furnace by simulation

Numerical analysis of an entire ceramic kiln under actual operating conditions for the energy efficiency improvement

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