Abstract:One of the primary causes that limit the blast furnace productivity is the resistance exerted to the gas flow in the cohesive zone by the ferrous burden. Use of nut coke (10-40 mm) together with ferrous burden proves beneficial for decreasing this resistance. In present study, effect of nut coke addition on the olivine fluxed iron ore pellet bed is investigated under simulated blast furnace conditions. Nut coke mixing degree (replacement ratio of regular coke) was varied from 0 to 40 wt% to investigate the phy… Show more
“…It was found that the nut coke addition in the pellet bed improves the bed permeability substantially. 16) Furthermore, the cohesive zone temperature range was observed to reduce by 16°C for every 10 wt% nut coke addition. 16) In the study, it was suggested that along with enhanced reduction kinetics, the higher iron carburisation would be the main cause for such behaviour.…”
Section: Melting Behaviour Of Iron Ore Pellet Bed Under Nut Coke Mixementioning
confidence: 92%
“…16) Furthermore, the cohesive zone temperature range was observed to reduce by 16°C for every 10 wt% nut coke addition. 16) In the study, it was suggested that along with enhanced reduction kinetics, the higher iron carburisation would be the main cause for such behaviour. However, the complete characterisation was not presented and discussions were not made about melting pattern in the presence or absence of nut coke in the pellet bed.…”
Section: Melting Behaviour Of Iron Ore Pellet Bed Under Nut Coke Mixementioning
confidence: 92%
“…Therefore, in our previous study, 16) a thorough investigation was performed to understand the physicochemical behaviour of the pellet bed when nut coke (0-40 wt%) was added as a replacement of the regular coke. It was found that the nut coke addition in the pellet bed improves the bed permeability substantially.…”
Section: Melting Behaviour Of Iron Ore Pellet Bed Under Nut Coke Mixementioning
confidence: 99%
“…The quenching temperature for the sample bed was determined based on a series of high-temperature experiments. 16) In order to understand the prime reason of the pellet bed melting, samples were quenched from a temperature close to the bed melting temperature. In addition, to understand the liquid flow behaviour in the presence of nut coke, the sample bed was quenched around the dripping temperature.…”
Section: Quenching Experimentsmentioning
confidence: 99%
“…The effect of nut coke addition on the pellet bed contraction and pressure drop was discussed comprehensively in our previous article. 16) In the present study, the fundamentals of pellet bed melting and dripping are investigated.…”
Section: Effect Of Nut Coke Addition On the Pressure Dropmentioning
The melting and dripping behaviour of an iron ore pellet bed mixed with nut coke are investigated through a series of quenching, melting and dripping experiments. In the melting bed of iron ore pellets, nut coke acts as a frame to maintain the passage for the gas flow. The iron carburisation level of the pellet shell is found to control the melting temperature of the pellet bed. Simultaneous and layer-wise melting is observed for the pellet bed with and without mixed nut coke, respectively. In the case of pellet bed mixed with nut coke, the liquid dripping starts at a lower temperature (1 500°C) compared to the case when nut coke is absent (1 518°C). Subsequently, a steady rate of liquid dripping is observed for the pellet bed mixed with nut coke. However, in the case of the pellet bed without nut coke, most of the liquid drips (~50 wt%) at high temperature (1 550°C). The difference in carbon content of the quenched pellets and the dripped metal reveals that a substantial iron carburisation occurs when liquid iron flows over the regular coke particles. The nut coke is noticed to consumed preferentially in place of the regular coke. Additionally, the total coke consumption decreases with an increase in nut coke addition in the pellet bed. These results give support for more extensive use of nut coke as a replacement of the regular coke in the ironmaking blast furnace.
“…It was found that the nut coke addition in the pellet bed improves the bed permeability substantially. 16) Furthermore, the cohesive zone temperature range was observed to reduce by 16°C for every 10 wt% nut coke addition. 16) In the study, it was suggested that along with enhanced reduction kinetics, the higher iron carburisation would be the main cause for such behaviour.…”
Section: Melting Behaviour Of Iron Ore Pellet Bed Under Nut Coke Mixementioning
confidence: 92%
“…16) Furthermore, the cohesive zone temperature range was observed to reduce by 16°C for every 10 wt% nut coke addition. 16) In the study, it was suggested that along with enhanced reduction kinetics, the higher iron carburisation would be the main cause for such behaviour. However, the complete characterisation was not presented and discussions were not made about melting pattern in the presence or absence of nut coke in the pellet bed.…”
Section: Melting Behaviour Of Iron Ore Pellet Bed Under Nut Coke Mixementioning
confidence: 92%
“…Therefore, in our previous study, 16) a thorough investigation was performed to understand the physicochemical behaviour of the pellet bed when nut coke (0-40 wt%) was added as a replacement of the regular coke. It was found that the nut coke addition in the pellet bed improves the bed permeability substantially.…”
Section: Melting Behaviour Of Iron Ore Pellet Bed Under Nut Coke Mixementioning
confidence: 99%
“…The quenching temperature for the sample bed was determined based on a series of high-temperature experiments. 16) In order to understand the prime reason of the pellet bed melting, samples were quenched from a temperature close to the bed melting temperature. In addition, to understand the liquid flow behaviour in the presence of nut coke, the sample bed was quenched around the dripping temperature.…”
Section: Quenching Experimentsmentioning
confidence: 99%
“…The effect of nut coke addition on the pellet bed contraction and pressure drop was discussed comprehensively in our previous article. 16) In the present study, the fundamentals of pellet bed melting and dripping are investigated.…”
Section: Effect Of Nut Coke Addition On the Pressure Dropmentioning
The melting and dripping behaviour of an iron ore pellet bed mixed with nut coke are investigated through a series of quenching, melting and dripping experiments. In the melting bed of iron ore pellets, nut coke acts as a frame to maintain the passage for the gas flow. The iron carburisation level of the pellet shell is found to control the melting temperature of the pellet bed. Simultaneous and layer-wise melting is observed for the pellet bed with and without mixed nut coke, respectively. In the case of pellet bed mixed with nut coke, the liquid dripping starts at a lower temperature (1 500°C) compared to the case when nut coke is absent (1 518°C). Subsequently, a steady rate of liquid dripping is observed for the pellet bed mixed with nut coke. However, in the case of the pellet bed without nut coke, most of the liquid drips (~50 wt%) at high temperature (1 550°C). The difference in carbon content of the quenched pellets and the dripped metal reveals that a substantial iron carburisation occurs when liquid iron flows over the regular coke particles. The nut coke is noticed to consumed preferentially in place of the regular coke. Additionally, the total coke consumption decreases with an increase in nut coke addition in the pellet bed. These results give support for more extensive use of nut coke as a replacement of the regular coke in the ironmaking blast furnace.
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