Energy and exergy analyses in a rotary burner with pre-calcinations in cement production

Çamdalı, Ünal; Eri̇ṡen, Ali̇; Çelen, Füsun

doi:10.1016/j.enconman.2003.12.002

Cited by 63 publications

(38 citation statements)

References 9 publications

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“…A con servative figure of how much energy is needed to manufacture one metric ton of HMA is around 85 kWh [4]. Therefore, the total quantity of energy consumed in this sector can be estimated in 136$10 6 MWh/year. On the other hand, the average world crude oil production during 2007 was 84,523 millions of barrels per day in average [5].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the literature in construction processes and materials is more scarce, although in the cement production literature studies have been found where energy and exergy analyses were used. Çamdali et al [6] carried out energy and exergy analyses of a dry system rotary burner with pre calcinations in a cement plant, including thermal and chemical processes: results showed that while the calculated energy efficiency is 97%, the calculated exergy efficiency is only 64.4%, providing an indication of the location of the degradation of energy. Rasul et al [7] identified the thermal energy conservation opportunities on the basis of energy and exergy balances of the kiln and cooler systems of an existing cement industry.…”

Section: Introductionmentioning

confidence: 99%

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Energy and exergy analysis in an asphalt plant’s rotary dryer

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García-Hernando

et al. 2011

Applied Thermal Engineering

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a b s t r a c tIn this paper, energy and exergy analyses of a rotary dryer employed in a Hot Mix Asphalt (HMA) plant for heating and drying of the aggregates in the mixture is presented. In the analysis, the exergy method in addition to the more conventional energy analysis, is employed to identify and evaluate the ther modynamic losses. The results show that, at design conditions, the plant performs with energy and exergy efficiencies of 0.89 and 0.18, respectively. The energy losses are mainly due to the flue gases. The exergy distribution indicates that the combustion and the heat transfer at different temperatures in the burner yield the highest exergy destruction in the process. A parametric study is conducted for the plant under various operational production parameters, including different humidities of the aggregates and filler content in aggregates, working temperatures and ambient conditions, in order to determine the parameters that affect the plant performance. It is shown that the solids humidity has a great impact on energy requirements. A better and sustainable use of the heat source employed in the dryer is proposed to avoid the high irreversibilities found. Furthermore, operating corrections in the mix or in the exhaust gas temperature are proposed to optimize the performance of the plant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy and exergy analysis in an asphalt plant’s rotary dryer

Peinado

Vega

García-Hernando

et al. 2011

Applied Thermal Engineering

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“…Isso faz com que nessa análise as perdas de energia devido às irreversibilidades do processo sejam omitidas. Por outro lado, a análise da exergia é capaz de evidenciar a degradação da energia envolvida no processo quantitativamente [12]. Isso ocorre porque ela leva em consideração a união entre as duas leis enunciadas.…”

Section: Introductionunclassified

“…Devido à importância dos fornos rotativos de clínquer na produção de cimento, diversos autores realizaram a modelagem desse equipamento com o intuito de realizar os balanços de massa, energia e exergia [10][11][12]14]. A partir desses balanços, é possível calcular as eficiências energética e exergética do forno.…”

Section: Introductionunclassified

Efeito da reação de calcinação nas análises energética e exergética de um forno rotativo empregado na produção de clínquer

et al. 2018

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Resumo A produção do cimento exige um grande consumo energético. A principal etapa desse processo é a clinquerização, onde ocorre a produção do clínquer, que é realizada em forno rotativo. Estudos publicados em literatura especializada indicam que parte significativa da energia gasta no processo produtivo do cimento é utilizada nesta parte do sistema. Em vista disso, é relevante o estudo sobre a utilização da energia disponibilizada para a operação do forno rotativo. Diversos autores realizaram a modelagem matemática de fornos rotativos objetivando analisar as eficiências energética e exergética desse equipamento. Neste trabalho, partindo-se de um estudo anterior, foi proposta uma metodologia para o cálculo das eficiências energética e exergética de um forno empregado na produção do clínquer. Foram adicionadas as reações envolvidas na calcinação e clinquerização, o que tornou a descrição do processo mais realista. Essas alterações afetaram significativamente os valores das eficiências obtidas anteriormente.

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“…Camdali et al [11] carried out energy and exergy analyses for a dry system rotary burner with pre-calcinations in a cement plant of an important cement producer in Turkey. Heat losses by conduction, convection and radiation from the rotary burner were obtained to be about 3% of the heat coming into the system.…”

Section: Introductionmentioning

confidence: 99%