Effect of CaO/Fe2O3 on ash fusibility during petroleum coke gasification and combustion

Xiong, Qing-an; Huang, Youjian; Li, Jiazhou; Zhang, Yuming; Zhang, Wei

doi:10.1016/j.fuel.2022.125667

Cited by 2 publications

(2 citation statements)

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“…However, it was noted that the atmosphere played a key role on the CaO-Fe 2 O 3 binary fluxing ability; the weak reducing atmosphere can greatly prompt the CaO-Fe 2 O 3 binary fluxing capability. Except for coal ashes, Xiong et al 44 investigated the influence of CaO/ Fe 2 O 3 ratio on AFTs of petroleum coke ash, which featured high-sulfur and rich vanadium and nickel. It was also displayed that AFTs of petroleum coke ash were closely associated with the CaO/Fe 2 O 3 mass ratio, and the ability of CaO/Fe 2 O 3 to decrease AFTs of petroleum coke ash was also connected to atmospheres.…”

Section: Cao-fe 2 O 3 Agent On Ash Fusion Behaviormentioning

confidence: 99%

“…The mineral species in petroleum coal ash were more complicated because vanadium and nickel can also react with CaO and Fe 2 O 3 to change the mineral transformation events. Xiong et al found that increasing CaO/Fe 2 O 3 mass ratio can result in the vansih of coulsonite (FeV 2 O 4 ) with high melting point,] and form low-temperature eutectics such as anorthite (CaAl 2 Si 2 O 8 ) and gehlenite (Ca 2 Al 2 SiO 2 ) in the reducing atmosphere, and continuous increasing of CaO/Fe 2 O 3 will result in the generation of calcium orthosilicate (Ca 2 SiO 4 ) featured with high melting point and inhibit the generation of CaAl 2 Si 2 O 8 /Ca 2 Al 2 SiO 2 inversely. Of course, the atmosphere also can change the mineral transformation route.…”

Section: Cao-fe2o3 Binary Fluxing On Coal Ash Flowabilitymentioning

confidence: 99%

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A Mini-review of the Capability of Calcium-Based Binary Fluxing in Adjusting Coal Ash Flowability

Shi,

Wu,

Bai

et al. 2023

Energy Fuels

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Coal ash flowability determines whether the coal ash slag can be successfully discharged from entrained flow gasifiers, to a large extent. Traditional single CaO fluxing cannot perform well enough to meet the requirement of slagging gasifiers for the flowability of coal ash with extremely high SiO2 and Al2O3. Thus, this work reviewed the effect of Ca-bearing binary (CaO-Fe2O3, CaO-Na2O, and CaO-MgO) fluxing on ash flowability. The effect of CaO-Fe2O3 binary fluxing on ash flowability has been systemically investigated, while studies concerning CaO-Na2O and CaO/MgO on coal ash flowability were limited. CaO-Fe2O3 binary fluxing performs well in adjusting the AFTs and viscosity behavior. The CaO/Fe2O3 fluxing mass ratio of 1/1 was recommended within the compromise of AFTs and viscosity at operating temperature. CaO-Na2O also displayed good performance to decrease AFTs, but strong volatilization of Na species brings difficulty to quantify the influence of CaO-Na2O compositional fluxing. CaO-MgO compositional fluxing showed a synergistic effect at controlling both AFTs and viscosity, while the addition of CaO-MgO fluxing easily led to a crystallization slag pattern. Besides, the value of CaO/MgO corresponding to the best fluxing performance and fluidity performance was unrevealed, as well as CaO/Na2O. The exploration of CaO-Na2O and CaO/MgO in the industry needs further testimony in coal ash with bad flowability. In a comprehensive comparison, CaO/Fe2O3 binary fluxing is the most promising compositional flux in adjusting the coal ash flowability. The review can give guiding information for selecting high-efficiency fluxing compositional fluxing.

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Section: Cao-fe 2 O 3 Agent On Ash Fusion Behaviormentioning

confidence: 99%

Section: Cao-fe2o3 Binary Fluxing On Coal Ash Flowabilitymentioning

confidence: 99%