Quenchants: Polymer

Prabhu, K. Narayan

doi:10.1081/e-eisa-120053893

Cited by 2 publications

(3 citation statements)

References 13 publications

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“…In view of byproduct cokemaking technology environmental pollutants, the 1990 Clean Air Act Amendments encourages the adoption of nonrecovery/heat-recovery cokemaking technology, as this technology meets the emission standards. 2 Because of differences in design between heat-recovery ovens and slot ovens, operational conditions in these two technologies are significantly different. Industry observers report a retrospective coke quality, as expressed by coke strength after reaction (CSR), variation that overrides coal properties of blend used between these two technologies.…”

Section: Introductionmentioning

confidence: 99%

“…The byproduct cokemaking technology, which uses batteries of slot ovens, has enjoyed decades of successful use as a predominant method of metallurgical coke production in U.S. coke manufacturing plants. However, the heat-recovery cokemaking technology is increasingly garnering attention and application as an alternative method, a move necessitated by tightening environmental legislations, among other factors. , With coal being an organically complex material consisting primarily of hydrocarbons, emissions associated with coal preparation fugitive particulates, coal charging, oven leaks, coke pushing, coke quenching, and byproduct recovery processes adversely impact human health and the environment. The U.S. Environmental Protection Agency (EPA) established the maximum achievable control technology and emission standards, which requires batteries to comply with source specific emission standards.…”

Section: Introductionmentioning

confidence: 99%

“…The U.S. Environmental Protection Agency (EPA) established the maximum achievable control technology and emission standards, which requires batteries to comply with source specific emission standards. In view of byproduct cokemaking technology environmental pollutants, the 1990 Clean Air Act Amendments encourages the adoption of nonrecovery/heat-recovery cokemaking technology, as this technology meets the emission standards …”

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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Numerical Calculation of the Heat Transfer Coefficients in Multi-Thermocouple Probes by the Reconstruction Temperature Method

Sanchez-Sarmiento

Cavaliere

2021

Materials Performance and Characterization

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The numerical simulation of the heat transfer problem of the quenching process requires an accurate characterization of the heat transfer coefficient dependence on surface temperature, which is usually determined by measuring the cooling curve and applying an inverse method. In most cases, the thermocouple is located at the center of the probe (ISO 9950, Industrial Quenching Oils — Determination of Cooling Characteristics — Nickel-Alloy Probe Test Method), but, in recent years, probes with several thermocouples have been developed (e.g., Tensi test) and the process to estimate the coefficients turned out to be more complex. The proposed methodology has considered the numerical reconstruction of the temperature field of the probe using multi-thermocouple measurements, actual material properties, and heat transfer equations. The heat transfer coefficients are directly obtained from the numerically reconstructed thermal field based on the fact that its gradient at the boundaries is proportional to the heat flux transferred. It is important to remark that neither parameter optimization nor curve fitting is needed.

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Quenchants: Polymer

Cited by 2 publications

References 13 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

Numerical Calculation of the Heat Transfer Coefficients in Multi-Thermocouple Probes by the Reconstruction Temperature Method

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