Nature and origin of coke quality variation in heat-recovery coke making technology

Nyathi, Mhlwazi S.; Kruse, Richard; Mastalerz, María; Bish, David L.

doi:10.1016/j.fuel.2016.02.050

Cited by 17 publications

(7 citation statements)

References 33 publications

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“…Surface area was determined by low-pressure nitrogen adsorption on degassed samples, using a Micromeritics Model ASAP-2020 apparatus, at the boiling temperature of liquid nitrogen, as detailed elsewhere, , Coke surface area was obtained from the isotherms by applying the Brunauer–Emmett–Teller (BET) equation.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…Understanding these differences is also important for developing a path toward re-evaluating existing CSR prediction models followed by, if necessary, either modifying or replacing these models. Furthermore, the vast majority of literature on the cokemaking process relates to and originates from byproduct cokemaking technology, − whereas a small portion of the literature specifically refers to heat-recovery technology. , For optimal operation and efficient application of this technology, it is vital to conduct studies that provide insights into fundamental differences between cokes produced by these two technologies. As part of our continuing study on heat-recovery cokemaking technology, the aim of this investigation is to develop an understanding of the nature and cause of the differences in CSR between cokes produced in a heat-recovery oven and conventional byproduct oven technology.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Coke Quality Variation between Heat-Recovery and Byproduct Cokemaking Technology

et al. 2017

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Coke structural properties that lead to coke quality difference between heat recovery and byproduct cokemaking technology are investigated. Coke fingers collected from two zones (bottom center and top center) of a commercial heat recovery oven were analyzed and compared to the coke produced from the same coal blend using a moveable-wall slot oven. Coke fingers were studied at set intervals, starting from the floor of the heat recovery oven through the top of the bed, and from the slot oven wall to wall. Coke strength after reaction (CSR) test, gas adsorption techniques, optical microscopy, and X-ray diffraction analyses were used to study the coke samples. Although exhibiting lower overall CSR compared to the heat-recovery oven coke, the slot oven produced a more uniform coke quality along the coke cake width, because of the narrow width and bilateral heating of the slot oven. The top-section coke of the heat-recovery oven displayed unique structural characteristics ascribed to the availability of free space atop this coke and the use of radiant heat to drive its coking process. The heat-recovery oven bottom center and slot-oven coke displayed low surface area and total porosity, indicating restrictive coke cake expansion. Limited swelling is attributed to the coal charge weight overlying the heat-recovery oven bottom coke and the constrained nature of the slot-oven chamber. However, the shorter coking time used in the slot oven disadvantageously deprives the slot-oven coke of sufficient time to fully develop its carbon structure; therefore, the heat-recovery oven cokes demonstrated better carbon structural development. For the slot-oven coke, carbon structural development seems to have a stronger impact on CSR than surface area does, while for the heat-recovery oven top center coke, surface area appears to be the parameter that most affects CSR.

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Section: Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Coke Quality Variation between Heat-Recovery and Byproduct Cokemaking Technology

et al. 2017

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“…Vertical flues of each pair are connected at the top through a window in the partition wall [10]. In [11] coke oven gas can save 300-400 Nm3/hour by using reversal cycle modification in coke plant [12]. The gas and preheated air are fed to the base of the flues from where they move upwards under the influence of chimney draught.…”

Section: Introductionmentioning

confidence: 99%

Optimization of specific heating consumption of coke oven plant using flow meter calibration modification

Mahato¹,

Agarwal²,

Jain³

2023

3C Tecnología

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Coke oven plant produces coke which acts as a reducing agent in blast furnaces. So, coke is an important material which is also called as a reducing agent. Coke is basically used for manufacturing of steel materials and extraction of metals. In an integrated steel plant coke is a prime material for making high grade of steels. In this present research work, the calibration of flow meter is modified. By this modification of gas flow meter calibration coke oven gas flow reduced from 17100Nm3/hrs to 16900Nm3/hrs, such as 200 Nm3 on hourly basis saving without any extra manpower cost. The proposed method is also cost effective as it saves Rs 6483000 every month for producing coke. This methodology is also helpful for reducing the manufacturing cost of coke in a recovery type of coke plant and stable oven operation and prolongation of coke oven life. Future advancements in this technique will allow us to minimize the need for money, which will revolutionize the nation's economy.

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“…The reaction behavior of coke in BF is mainly related to its thermal strength and reactivity. 3) A series of multiphase complex reaction of coke in BF have been studied in detail by scholars and researchers, including composition, structure, performance after its interaction between gas, liquid and solid. 4) Due to the gradual shortage of resources, the main problems that coking faces are the diversity of coal selected for metallurgical coke, the complexity of coal types themselves, and the variability of coal blending schemes.…”

Section: Introductionmentioning

confidence: 99%

New Method for Preparation of Coke Analogues and Comparability for Industrial Metallurgical Coke

Sun

Zhang

et al. 2020

ISIJ Int.

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To better understand metallurgical coke behavior in blast furnace, the preparation of coke analogues was improved by using demineralized coke powder. Scanning electron microscope, Raman spectroscopy, mercury intrusion method, and CO 2 gasification reactivity test were used to establish the representativeness relation between different coke analogues and metallurgical cokes. The results show that the coke analogues prepared by graphite powder and demineralized metallurgical coke powder were in general representative of industrial coke. With the controlled and reproducible pore characteristic, the average pore diameter of coke analogues is smaller and the average pore area is bigger, while the pore connectivity of metallurgical coke is stronger. Analogue prepared from demineralized coke has a slight superiority over that prepared from graphite in carbon structure and gasification reaction with CO 2 . In general, the coke analogue made from demineralized coke has higher comparability to industrial metallurgical coke and are more suitable for laboratory research.

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Nature and origin of coke quality variation in heat-recovery coke making technology

Cited by 17 publications

References 33 publications

Investigation of Coke Quality Variation between Heat-Recovery and Byproduct Cokemaking Technology

Investigation of Coke Quality Variation between Heat-Recovery and Byproduct Cokemaking Technology

Optimization of specific heating consumption of coke oven plant using flow meter calibration modification

New Method for Preparation of Coke Analogues and Comparability for Industrial Metallurgical Coke

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