Exergy based efficiency indicators for the silicon furnace

Børset, Marit Takla; Kolbeinsen, Leiv; Tveit, Halvard; Kjelstrup, Signe

doi:10.1016/j.energy.2015.07.010

Cited by 31 publications

(7 citation statements)

References 15 publications

(19 reference statements)

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“…On the first day of the tests we did not intervene in existing operating process. Similar problems were observed by investigators 7,8 with a negative distribution of the electric current in the cavity. As seen from the results of 26.12.17, currently used mode is characterized by great instability.…”

Section: Resultssupporting

confidence: 83%

“…However, one must correlate process model and practical operating. The importance of accurate exergetic balancing was described by the authors 8 . However, this technique should also be associated with the operator's actions.One needs to download the raw materials per unit of time, consistent with the consumption of electricity over the same length of the previous period.…”

Section: Introductionmentioning

confidence: 99%

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Operational Aspects of Silicon Oxidereduction Process and Their Effects on the Material and Thermal Flows Balance in Carbothermic Reactors

2018

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The article deals with the influence of operational aspects on the performance of the reduction process in reactors with submerged electrical arc. Experiments were conducted in the large-scale laboratory conditions in one-electrode furnace with a capacity of 200 kVA at Chemical and Metallurgical Institute (Karaganda, Kazakhstan). Also limited industrial research in the furnace with the capacity of 30 MVA at LLP ‘Tau-KenTemir’ was conducted.In the process of the research, evidence was achieved that increasing the interval between the furnace top treatments up to 30 minutes, and achieving a balance between the material and thermal flows in a reactor allow increasing silicon yieldup to 10-15% minimum. Fluctuations in the phase currentstabilize. It was proved that on the basis of the concept of balancing it is possible to bringan industrial reactor out of complex crisis statesrather quickly.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Operational Aspects of Silicon Oxidereduction Process and Their Effects on the Material and Thermal Flows Balance in Carbothermic Reactors

2018

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“…The flue gas flow rate is assumed to scale linearly with the furnace electrical power. The same applies for mass flows of ore, carbon and metal produced [30][31][32]. The mass and energy balances for combustion of furnace flue gas with air and recirculated flue gas are calculated using the open source physical properties library [33], which is based on the Shomate enthalpy correlations from the National Institute of Standards and Technology (NIST) Chemistry WebBook [34,35].…”

Section: Silicon and Ferrosilicon Productionmentioning

confidence: 99%

Investigating the Potential for Increased Energy Utilisation and Reduced CO2 Emissions at Mo Industrial Park

et al. 2020

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The potential for increased energy utilisation and reduced carbon footprint has been investigated for the industrial park Mo Industri Park (MIP), located at Mo i Rana, Norway. Process data has been gathered to quantify the energy flows between industrial clients. The energy flows have been visualised quantitatively in Sankey diagrams, while the quality of the available energy is presented in the form of a grand composite curve. High temperature flue gas from ferrosilicon (FeSi) production at Elkem Rana represent the largest heat source available for utilisation. A theoretical assessment of potential applications for this energy is presented and includes: (1) electricity production; (2) local biocarbon production, where surplus heat is utilised for drying of wood chips; (3) post combustion carbon capture, where surplus heat is utilised for solvent regeneration. The results indicate that increasing the current energy recovery from 400 GWh to >640 GWh is realistic. The increase in energy recovery can be used for reducing the carbon footprint of the industrial park. Investment in a common utility network for surplus heat may lower the threshold for establishing other energy clients at MIP. These are possibilities which may be investigated in more detail in future work.

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“…The task efficiency has been defined and applied to different industrial processes, such as thermal power plants, air separation, heat storage systems, oil and gas platforms, and silicon production …”

Section: Exergy‐based Performance Indicatorsmentioning

confidence: 99%

“…The 3 different values for ε t a s k reported in Table have been calculated in Nguyen Tuong‐Van et al by following the approach of 3 alternative groups of authors. For the silicon furnace, a possible task exergy efficiency has been defined excluding the exergy of the volatiles introduced with the carbonaceous materials from the exergy inputs . Despite the fact that the task efficiency succeeds into highlighting that a good margin to improve the system exists, its non‐unique definition leaves room for interpretation and may cause problems when it is necessary to apply it systematically to processes of different nature.…”

Section: Examples Of Application Of Exergy‐based Kpis To Industrial Pmentioning

confidence: 99%

Exergy-based performance indicators for industrial practice

2018

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Summary Key performance indicators (KPIs) are powerful tools that industries can use not only to monitor their activities but also to highlight their unexploited potential. Energy‐based KPIs are nowadays mostly used to evaluate industrial process performances. However, these indicators might present some limitations and might give misleading results in some circumstances. An example is represented by industrial processes that make use of different energy forms (eg, electricity and heat) and of different material inputs, and that are therefore difficult to compare in terms of energy. A further example can be found in the Carnot engine that, despite being ideal, can have quite low energy efficiency (eg, the energy efficiency of a Carnot engine working between 700 and 300 K is 57%), suggesting that its performance can be improved. The use of exergy‐based KPIs allows us to overcome many of the limitations of energy‐based indicators. The exergy efficiency of Carnot engines is 100%, clearly indicating that the system cannot be further improved. Moreover, the use of specific exergy consumption instead of specific energy consumption to monitor the performance of a process allows one to take into account possible differences in quality of material and energy streams. In the present work, exergy‐based KPIs for industrial use are reviewed. The paper outlines advantages and limitations of the reviewed indicators, with the scope of promoting their use in industry. A systematic use of exergy‐based KPIs not only gives a meaningful representation of process performances in terms of resource use but it can also direct efforts to improve the processes. To better understand their meaning under different circumstances, the revised indicators are applied to 3 industrial processes.

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Exergy based efficiency indicators for the silicon furnace

Cited by 31 publications

References 15 publications

Operational Aspects of Silicon Oxidereduction Process and Their Effects on the Material and Thermal Flows Balance in Carbothermic Reactors

Operational Aspects of Silicon Oxidereduction Process and Their Effects on the Material and Thermal Flows Balance in Carbothermic Reactors

Investigating the Potential for Increased Energy Utilisation and Reduced CO2 Emissions at Mo Industrial Park

Exergy-based performance indicators for industrial practice

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