Exergy transfer analysis of an aluminum holding furnace

Acevedo, Luis; Usón, Sergio; Uche, Javier

doi:10.1016/j.enconman.2014.10.021

Cited by 23 publications

(6 citation statements)

References 21 publications

(25 reference statements)

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“…Nu ex ¼ Nu ex;T À Nu ex;P (13) where Nu ex,T is the derived exergy transfer Nussult number owing to temperature difference beat transfer and is equal to…”

Section: Exergy Transfer Analysismentioning

confidence: 99%

Exergy transfer characteristics of gas-solid heat transfer through sinter bed layer in vertical tank

Feng

Dong

Gao

et al. 2016

Energy

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“…Nu ex ¼ Nu ex;T À Nu ex;P (13) where Nu ex,T is the derived exergy transfer Nussult number owing to temperature difference beat transfer and is equal to…”

Section: Exergy Transfer Analysismentioning

confidence: 99%

Exergy transfer characteristics of gas-solid heat transfer through sinter bed layer in vertical tank

Feng

Dong

Gao

et al. 2016

Energy

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“…Aluminum and aluminum alloy products, which have good mechanical property and superb cast ability, are widely used in automobile, construction, communication and other fields [1]. Aluminum melting alone contributes more than 50% of a plant's total energy consumption, along with massive CO2 emissions and other waste production [1], [2]. In view of huge energy-cost and increasingly stringent emissions regulations, much attention has been paid to research and applications on energy conservation and emissions reduction for melting furnace [3].…”

Section: Introductionmentioning

confidence: 99%

“…Subject to existing hardware, the software-based strategies of reducing energy consumption have been reviewed in the literature [4]- [7]. There are many studies focusing on numerical simulation, e.g., [2], [8], [9]. In the literature [9], CFD technique combining with Taguchi method and crosstable-based analysis of variance was developed to optimize the parameter of melting process of an aluminum melting furnace.…”

Section: Introductionmentioning

confidence: 99%

Integration of Numerical Simulation and Control Scheme for Energy Conservation of Aluminum Melting Furnaces

et al. 2019

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Aluminum melting process is a semi-continuous process with high-energy consumption. In this paper, a software-based strategy which considers numerical simulation and control scheme simultaneously is employed to improve energy consumption of aluminum melting furnaces without changing the hardware. For numerical simulation, a nonlinear steady-state optimization is performed offline to obtain optimal operating points. Extensively, the optimal operating conditions include not only product exit temperature, but also ratio of combustion air flow and natural gas flow, furnace temperature, flue gas temperature and some important manipulated variables. For control scheme, a two-layer model predictive control which consists of steady state target calculation and dynamic optimization is developed to track the optimal operating conditions. In steady state target calculation layer, a priority strategy is proposed based on the different importance of controlled variables to make the steady state targets more reasonably. In dynamic optimization layer, a quadratic objective function is defined in terms of tracking both the optimal steady-state of controlled variables and manipulated variables. The method is successfully carried out in F1 aluminum melting furnace of a company in Tianjin. Compared with previous operation, the comprehensive energy consumption and the comprehensive energy consumption for unit output of product decrease 5.99% and 6.56% respectively. INDEX TERMS Melting processing, predictive control, control engineering, steady-state target calculation.

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“…Since then, countries like Canada [8], Japan, Finland, Sweden [9] [10] [11], and Turkey [12] [13] have also been analysed using the modified version of the technique. Exergy analysis has also been applied to aluminium recovery processes [14], die casting [15] and aluminium holding furnace [16].…”

Section: Introductionmentioning

confidence: 99%

Energy-Exergy Analysis and Carbon (IV) Oxide Emission of an Aluminium Extrusion Plant in Nigeria

Waheed¹,

Aiyedun²,

Oke³

et al. 2017

ENG

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Energy security, cost of production and environmental constraints have necessitated the need for proper energy utilisation in the manufacturing industries. This work analysed energy and production data from an aluminium extrusion plant in Lagos, Nigeria for energy efficiency, exergy efficiency (or process efficiency), energy cost per unit of production, CO 2 emission and pollution rate index. The input-output energy analysis method was used to estimate the embodied energy intensity. The pollution rate, energetic and exergetic efficiencies were estimated from the exergy analysis. The CO 2 emission was estimated from IPCC guideline on greenhouse inventories and the energy cost of unit produce was estimated from energy cost accounting method. The five-year average thermal and electrical utilisation ratio was 45/55, which deviated from the 70:30 of the global best practices. The embodied energy intensity for the five years' ranges between 2.31-162.3 GJ/t which is in excess of the recommended range of (2.9-3.2 GJ/t). The mean energy efficiency for the five year was 79.4% and the mean exergetic efficiency was 57.8% indicating that production was well managed (>50%) with energy wastages very high in boiler energy conversion. The total energy used was 16 MJ and CO 2 emitted is 1.01 × 10 11 g during the study period. The average pollution rate index for the plant was 0.8695 indicating that the plant is negatively impacting the environment due to technological limitation of the energy conversion process employed in the manufacturing plant. The study reveals a distortion of the recommended best practice in energy balance ratio which accounted for the high average cost of production (₦ 4418.3/t); process efficiency was generally low thereby negatively affecting industrial output for the company.

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Exergy transfer analysis of an aluminum holding furnace

Cited by 23 publications

References 21 publications

Exergy transfer characteristics of gas-solid heat transfer through sinter bed layer in vertical tank

Exergy transfer characteristics of gas-solid heat transfer through sinter bed layer in vertical tank

Integration of Numerical Simulation and Control Scheme for Energy Conservation of Aluminum Melting Furnaces

Energy-Exergy Analysis and Carbon (IV) Oxide Emission of an Aluminium Extrusion Plant in Nigeria

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