Estimation of Energy Consumption in COREX Process Using a Modified Rist Operating Diagram

Wenlong, Zhan; Wu, Keng; Liu, Qihang; Wu, X.H.

doi:10.1016/s1006-706x(15)30115-1

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Figure 4 in combination with Eqs. (19), (20). This point shifts with the changes in the reducing gas composition.…”

Section: Resultsmentioning

confidence: 92%

“…17) The operating line based approach of the Rist diagram known for blast furnace fuel rate calculation, 18) has also been used to study the fuel consumption of COREX process by Zhou et al 19) The modifications in the Rist diagram of the blast furnace due to the pulverized coal injections were used for COREX process. The similar approach has been utilized to analyse the mass and heat balances of the COREX process, by Zhan et al 20) They established a suitable modified operating diagram, which also indicated the influences of the raw materials, and the metallization rate on the fuel consumption. Theoretical assumptions of the blast furnace operations were also applied to the COREX process for the reference.…”

Section: Introductionmentioning

confidence: 99%

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Operating Line Prediction of COREX Iron-making Process Using RIST Diagram

2020

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In the present work, the calculations of the modified operating line for the COREX process, based on the Rist diagram approach, have been performed. The operating line developed by Rist in 1960's has been modified by various researchers for improvements in the blast furnace. The idea proposed by Rist was further utilized to perform the heat balance along with the net oxygen balance for the other iron making processes. The operating line has been modified thus accounting the generated H 2 O and CO 2 with respect to Fe, in the process of smelting reduction of ore by coal containing volatile and moisture.

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“…Figure 4 in combination with Eqs. (19), (20). This point shifts with the changes in the reducing gas composition.…”

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Operating Line Prediction of COREX Iron-making Process Using RIST Diagram

2020

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“…As a result, relevant aspects of his work are sometimes not widely known. Such is the case that some authors claim to modify the Rist diagram to include the H 2 contribution 14 , 15 , when in fact this was already taken into account by Rist. For these reasons, we decided to revisit his original work, during which we made a number of additions and corrections.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the Rist diagram for predicting operating conditions in blast furnaces with multiple injections

Bailera¹,

Nakagaki²,

Kataoka³

2021

Open Res Europe

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Background: The Rist diagram is useful for predicting changes in blast furnaces when the operating conditions are modified. In this paper, we revisit this methodology to provide a general model with additions and corrections. The reason for this is to study a new concept proposal that combines oxygen blast furnaces with Power to Gas technology. The latter produces synthetic methane by using renewable electricity and CO2 to partly replace the fossil input in the blast furnace. Carbon is thus continuously recycled in a closed loop and geological storage is avoided. Methods: The new model is validated with three data sets corresponding to (1) an air-blown blast furnace without auxiliary injections, (2) an air-blown blast furnace with pulverized coal injection and (3) an oxygen blast furnace with top gas recycling and pulverized coal injection. The error is below 8% in all cases. Results: Assuming a 280 tHM/h oxygen blast furnace that produces 1154 kgCO2/tHM, we can reduce the CO2 emissions between 6.1% and 7.4% by coupling a 150 MW Power to Gas plant. This produces 21.8 kg/tHM of synthetic methane that replaces 22.8 kg/tHM of coke or 30.2 kg/tHM of coal. The gross energy penalization of the CO2 avoidance is 27.1 MJ/kgCO2 when coke is replaced and 22.4 MJ/kgCO2 when coal is replaced. Considering the energy content of the saved fossil fuel, and the electricity no longer consumed in the air separation unit thanks to the O2 coming from the electrolyzer, the net energy penalizations are 23.1 MJ/kgCO2 and 17.9 MJ/kgCO2, respectively. Discussion: The proposed integration has energy penalizations greater than conventional amine carbon capture (typically 3.7 – 4.8 MJ/kgCO2), but in return it could reduce the economic costs thanks to diminishing the coke/coal consumption, reducing the electricity consumption in the air separation unit, and eliminating the requirement of geological storage.

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“…Most of the studies on TGR-OBF and COREX have focused on a reaction unit rather than the ISP. Wenlong et al estimated the impact of different metallization rates and fuel structures on the energy consumption of the COREX process by using a modified Rist operating diagram [23]. Hu et al compared the CO 2 emissions between the COREX and blast furnace ironmaking system based on carbon element flow analysis [24].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Energy Consumption and CO2 Emission for Three Steel Production Routes—Integrated Steel Plant Equipped with Blast Furnace, Oxygen Blast Furnace or COREX

Song

Jiang

Bao

et al. 2019

Metals

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High CO2 emissions and energy consumption have greatly restricted the development of China’s iron and steel industry. Two alternative ironmaking processes, top gas recycling-oxygen blast furnace (TGR-OBF) and COREX®, can reduce CO2 emissions and coking coal consumption in the steel industry when compared with a conventional blast furnace (BF). To obtain parameters on the material flow of these processes, two static process models for TGR-OBF and COREX were established. Combining the operating data from the Jingtang steel plant with established static process models, this research presents a detailed analysis of the material flows, metallurgical gas generation and consumption, electricity consumption and generation, comprehensive energy consumption, and CO2 emissions of three integrated steel plants (ISP) equipped with the BF, TGR-OBF, and COREX, respectively. The results indicated that the energy consumption of an ISP with the TGR-OBF was 16% and 16.5% lower than that of a conventional ISP and an ISP with the COREX. Compared with a conventional ISP, the coking coal consumption in an ISP with the TGR-OBF and an ISP with the COREX were reduced by 39.7% and 100% respectively. With the International Energy Agency factor, the ISP with the TGR-OBF had the lowest net CO2 emissions, which were 10.8% and 35.0% lower than that of a conventional ISP and an ISP with the COREX. With the China Grid factor, the conventional ISP had the lowest net CO2 emissions—2.8% and 24.1% lower than that of an ISP with the TGR-OBF and an ISP with the COREX, respectively.

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Estimation of Energy Consumption in COREX Process Using a Modified Rist Operating Diagram

Cited by 5 publications

References 9 publications

Operating Line Prediction of COREX Iron-making Process Using RIST Diagram

Operating Line Prediction of COREX Iron-making Process Using RIST Diagram

Revisiting the Rist diagram for predicting operating conditions in blast furnaces with multiple injections

Comparison of Energy Consumption and CO2 Emission for Three Steel Production Routes—Integrated Steel Plant Equipped with Blast Furnace, Oxygen Blast Furnace or COREX

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