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The coking process is based on the transformation of coal into coke at high temperature. In non-recovery coke oven, heating is usually asymmetric, this may be due to the fact that heating is provided by controlled combustion of volatile matter of charged cake at oven crown and sole flue.In the present investigation, a simplified temperature …
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a. Lower carbon content: Non-coking coal generally has a lower carbon content compared to cooking coal, typically ranging from 40% to 70%. b. Higher ash content: Non-coking coal has a higher ash content, which means it produces more ash residue when burned. This makes it less suitable for the production of coke.
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DOI: 10.1016/S1006-706X(14)60104-7 Corpus ID: 137593146; Effect of Indian Medium Coking Coal on Coke Quality in Non-recovery Stamp Charged Coke Oven @article{Tiwari2014EffectOI, title={Effect of Indian Medium Coking Coal on Coke Quality in Non-recovery Stamp Charged Coke Oven}, author={Hari Prasad Tiwari and P. K. …
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Abstract. In order to predict the behaviour of the heat-recovery (HR) /non-recovery (NR) coke oven during the coke-making process, time-dependent numerical …
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The model is validated using measured temperatures of coal and flue gas bed in a coke oven in operation for a coking cycle. Temperature variation and its distribution in the coking chamber, combustion chamber, and heating wall are simulated for the coke oven using silica bricks with different thermal conductivities.
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Maximization of non-coking coal in coal blend is eloquent interest among researchers in coke making throughout the world. To maximize the non-coking coals in coal blend with the scarce and expensive coking coals is an essential practice in the iron and steel industry.
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The CCP model indi cates that upto 30% non coking coal may be used in heat recovery coal blend to get ≥65 coke CSR [26] [27]. Though this was a learning phase of this new technol ogy for Tata ...
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The coking-bed is 1 m high, 3.45 m wide and 12.9 m deep; the sole-flue beneath the bed is 26 m long (13 m long inner flue plus 13 m long the outer one) and there are nine down-comers, as shown in Fig. 1.The exhaust gases are discharged by four uptakes (as shown in Fig. 1).During the measurement campaign the oven has produced …
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In HR/NR coke ovens, the coal/coke bed is located in a large chamber of the oven (see Fig. 1) [1], ... One-dimensional model of heat-recovery, non-recovery coke ovens. Part II: Coking-bed sub-model. Fuel, 181 (2016), pp. 1115-1131. View PDF View article View in Scopus Google Scholar [34]
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The present paper discusses the optimisation of bulk density and coal blend, and use of non-coking coals in the coal blend to obtain the desired coke with …
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Temperature, pressure and inner combustion are controlled in the ovens. Coking time is in the order of 48 hours. Coke withdrawal is carried out with the same PCM used for …
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12.2.1 General. Metallurgical coke is produced by the destructive distillation of coal in coke ovens. Prepared coal is heated in an oxygen-free atmosphere (–coked–) until most volatile components in the coal are removed. The material remaining is a carbon mass called coke. Metallurgical coke is used in iron and steel industry processes ...
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JSW Steel has adopted the newly developed vibrocompaction precarbonisation technique, along with non-recovery ovens, having a capacity to produce 1˙2 Mtpa of coke. Optimisation of coal blend and bulk density of cake produced from vibrocompaction has helped JSW use inferior coals up to 35% in the coal blend, without …
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The waste mill oil was added in the coal blend as a binder before hammer mill and charged in the ovens. JSW Steel has non-recovery coke ovens synergized with vibro-compaction technology to produce ...
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The coking process is based on the transformation of coal into coke at high temperature. In non-recovery coke oven, heating is usually asymmetric, this may be …
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A blend of several coals is used and Table 1 provides the proximate and ultimate analysis of the blend [4]. Prior to insertion into the oven, the coal blend charge is …
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The Soviet coking industry now constitutes a highly developed sector of the national economy. Large modern plants equipped to recover all the coke-oven products have replaced the small undertakings operating imperfect techniques and equipment with largely manual labor, making a limited range of products and associated with …
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During the carbonization of coking coal in a by-product coke oven battery, the VM consisting of around 25 % to 30 % of the coal charged is driven off as effluent gas which leaves the coke oven chambers as the hot raw coke oven gas. ... coke oven battery. In the non-recovery process, air is introduced above the top of the coke bed in …
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Worldwide, the cokemaking process has remained more or less unchanged for over 100 years, and metallurgical coke is produced in recovery and nonrecovery coke ovens by using top gravity and stamp charging and a wide range of coal bases.As BFs have been operated with coke, it has been urged globally to reduce the coke cost more …
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In heat recovery non-recovery coke ovens, the volatile gases generated are burnt, and the heat generated is used for cokemaking. The extra heat, along with the flue gases, is utilised in boilers for power generation. JSW Steel has 1·2 Mtpa non-recovery coke ovens to meet the coke requirement of blast furnaces. Until now, very limited work has been …
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Non-recovery coke ovens are used for production of coke, whereby products are not recovered. Power can be generated by means of waste gas heat recovery. In this way …
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7. Coke making can either be a part of an integrated steel plant or can be undertaken independently. 8. In non-recovery beehive oven the horizontal space requirement is at least 30–40% more than in the case of slot-oven batteries. 9. The first set of non-recovery coke ovens were built in ___________. 10.
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The calculations show that about 15% of the raw gas enthalpy is transferred to the coal/coke bed. Most of the energy released during coal decomposition process is lost with the flue gases (47.4%) and heat conduction through the walls to the environment (39.7%). ... One-dimensional model of heat-recovery, non-recovery coke ovens. …
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The cycle for the production of coke by each oven was about 72 hours. The non-recovery process has again become an important factor to the coke industry, particularly in light of the more favorable economics. ... but also non-recovery coke ovens can be built at remote coal mine locations from where the coke can be shipped at less cost to ...
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The highlight of the study can be summed up as follows: In a 48-h coking cycle, the thermal profiling via infrared imaging for one oven for the higher VM blend …
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The non-recovery coking process uses both direct and indirect high-temperature heating in an oxygen deficient atmosphere to transform coal to coke by driving off the volatile matter to concentrate the carbon. ... and stamping operations. In addition, coke oven coal charging and coke pushing operations will occur on the eastern and western sides ...
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The objective of this study was to maximize the use of non-coking coal in the coal blend without deteriorating the coke quality in non-recovery coke oven. The …
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Coking time is in between 72 and 96 hours.
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Premium technology for heat-recovery coke ovens. Compared to conventional slot-type ovens, this technology has the advantage that coal of a comparably "poorer" grade can be used, and at the same time a higher-grade coke with larger individual pieces obtained. "Poorer" grade means that coals with high or low volatile matter can be used ...
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The HR/NR coke oven examined in this study is shown in Fig. 1a (see half of the oven). The design consists of two main parts: a large chamber where the coal blend charge is located (upper-oven) and the horizontal heating flues placed below the charge in the bottom part of the oven (sole-flues).
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This led to the revival of interest in the non-recovery coke oven technology as it was realized that it could be used with minimum investment and complied with the pollution control regulations [3]. Non-recovery coke ovens are used for production of coke, whereby products are not recovered. Power can be generated by means of waste gas …
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Along with these advantages, our design is synonymous with low energy consumption, premium coke product quality, and maximum operational reliability. All this together means that our ovens boast an extremely long oven lifetime of more than 45 years. thyssenkriupp Uhde is a world leader in developing best available technologies.
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Semantic Scholar extracted view of "One-dimensional model of heat-recovery, non-recovery coke ovens: Part IV: Numerical simulations of the industrial plant" by R. Buczyński et al. ... non-recovery coke ovens Part V: Coking-bed sub-model using an inverse procedure ... coking some coals generate pressures in coke ovens that are …
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The use of increased proportion of semi-soft coal (crucible swelling number of 2.5) and high ash (≥ 15%) indigenous coal in the range of 20%–35% and 20%–65% respectively in the blends resulted in good quality of coke. Plant data of a non-recovery coke oven were used for developing and validating the model.
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In non-recovery ovens, coking proceeds from the top through direct heating by the partial combustion of the volatile matter over the coal bed, and from the bottom by heat coming from full
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NR/HR-coke ovens. CFD-simulations of processes occurring in both the up - per and the lower part of the oven, allow both identify the reasons for uneven heating and propose remedies. The coke making process is transient and requires typically around 48 to 72 hours until the coal has been completely transformed to coke. Performing time-de -
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