Effect of Heating Rate on Coke Quality and Productivity in Nonrecovery Coke Making

Tiwari, H. P.; Banerjee, P. K.; Saxena, V. K.; Sharma, Rahul; Haldar, S. K.; Paul, Sanjoy Kumar

doi:10.1080/19392699.2014.896349

Cited by 20 publications

(5 citation statements)

References 13 publications

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“…One prepared coke sample was distributed to all participating laboratories to determine the coke CRI and CSR in this exercise. Having a single source of coke sample will nullify the possible error of sampling and the effects of heating rate, bulk density during carbonization, which affects the resulting coke quality. , Each laboratory conducts the coke reactivity followed by the coke CSR test by adopting the standard operating procedure, and results were compiled in the form of a Z score.…”

Section: Resultsmentioning

confidence: 99%

“…At 1100 °C, the solution loss region was the largest and increased in local porosity, which was relatively homogeneous, whereas in the coke outer-surface region, the solution loss region and degradation region occurred at 1300 °C. Still, variability at 1150 °C for CO 2 concentration and local porosity within the coke led to the highest coke degradation and the lowest coke strength after reaction. − The literature also reported that the sensitivity of the coke CRI and CSR determined from the quality control laboratories should be adequate because it depends on several operating parameters like heating rate, bulk density, moisture content, temperature, etc. ,− Also, many researchers have developed a prediction model based on various factors that can give insight into coke quality based on data mining techniques. − Therefore, in this study, the authors have conducted detailed research on factors affecting variability in coke reactivity test under the standard test condition for laboratory and commercial coke samples produced from stamp charge batteries using a specially designed sample holder probe. The study of inter-laboratory comparison test (ILCT) on CSR and CRI at different laboratories is also part of the present research.…”

Section: Introductionmentioning

confidence: 93%

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Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

et al. 2022

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The coke reactivity index and coke strength after reaction are critical parameters for the efficient operation of a blast furnace. Therefore, maintaining desired qualities of the produced coke as per coal blend chemistry and coke oven battery parameters is essential. However, the coke reactivity index (CRI) and coke strength after reaction (CSR) vary from laboratory to laboratory even though they have the same determination methodology. In the present investigation, a unique laboratory sample holder for reactivity test has been developed. The test method by Nippon Steel Corporation (NSC) has been compared with the newly developed sample holder method. The correlation between coke CRI and CSR has been studied with samples with a wide range of reactivity in the repeatability test. Results confirmed that the reactivity of coke highly depends on the reaction of individual coke pieces participating in the test. Despite undergoing strict process monitoring of the testing procedure of hot strength of coke, the present study confirmed that a variation of ±2 points in coke CSR and CRI does not affect coke quality in a single reading. The study also includes the influence of the number of coke pieces in the test sample to optimize the coke bed height. This paper described in detail the methodologies adopted, addressing the factors resulting in differences in CRI/CSR values within the same coke.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

et al. 2022

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“…Identical carbonization rates from both the sides can be achieved by appropriate heat input from the side walls. The uniform coking rate from both sides will result in an even carbonization and hence improvement in coke quality and productivity [10].…”

Section: Influence Of Heating Rate On Cokemakingmentioning

confidence: 99%

Influence of thermal conductivity of ceramic materials on heating rate/coking time and coke quality in cokemaking

Tiwari

Kumar

Tiwary

et al. 2019

Metall. Res. Technol.

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The Iron and Steel Industry has undergone a radical change, and processes have been developed continually for the faster rate of production. The thermal characteristic of reaction depends on the thermal conductivity of coal charge by progressively developing the zone of coke. In general, higher the oven temperature, the more rapid is the initial rate of heating, plastic temperature range, plasticity and volatile evolution characteristics of the coal. The higher thermal conductivity of bricks will increase heat transfer rate and consequently, the output of the oven will increase the throughput. The heating rate is also associated with the pattern of heat supply during carbonization which influences the strength and fissuring of the coke. Results show that replacement of LC-65 castable with higher thermal conductivity castable SiC-30% reduces the coking time by 50% whereas LC-85 reduces the coking time by 20% even at same coke end temperature and coke CSR. The requirement of free space temperature of the laboratories oven is different for using different thermal conductivity of the ceramic castable to maintain same heating rate and coke end temperature during coking. Results confirmed that increasing the thermal conductivity of ceramic castable decrease in the free space temperature to maintaining the constant heating rate (∼4 °C/min) and coke end temperature (∼925 °C). The results also depict that the use of SiC-30 and LC-85 castable, the input temperature should be reduced by ∼200 °C and ∼100 °C to maintain the same heating rate and coke end temperature as compared to LC-65 castable. The study will also beneficial for reducing the Noxs.

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“…The gas and preheated air are fed to the base of the flues from where they move upwards under the influence of chimney draught. [13]the hot products of combustion cross over to the adjacent flues and pass on the regenerators where the checker-work absorbs most of the sensible heat contained in the product of combustion. [14].…”

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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Effect of Heating Rate on Coke Quality and Productivity in Nonrecovery Coke Making

Cited by 20 publications

References 13 publications

Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

Variability in Metallurgical Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR): An Experimental Study

Influence of thermal conductivity of ceramic materials on heating rate/coking time and coke quality in cokemaking

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

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