Study on slag composition and flow property in a bench-scale OMB gasifier

Yu, Guangsuo; Zhu, Qingrui; Chi, Guozhen; Guo, Qinghua; Zhou, Zhijie

doi:10.1016/j.fuproc.2012.05.001

Cited by 28 publications

(9 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rather complicated and somewhat unambiguous is the effect of included and excluded mineral matter in coal. There is still no consensus on the exact nature and extent of this influence [8,26,46,65,67] on UC, since the mineral matter effect on char oxidation can be both positive and negative.…”

Section: Effect Of Volatile Matter Contentmentioning

confidence: 99%

Unburned carbon from coal combustion ash: An overview

Bartoňová

2015

Fuel Processing Technology

144

View full text Add to dashboard Cite

Section: Effect Of Volatile Matter Contentmentioning

confidence: 99%

Unburned carbon from coal combustion ash: An overview

Bartoňová

2015

Fuel Processing Technology

144

View full text Add to dashboard Cite

“…Wall et al reported that slag composition is preferentially contributed by the excluded mineral matter based on a pilot scale study [13]. This was further suggested by Yu et al based on a study of slag in a bench-scale Opposed Multi Burner (OMB) gasifier [102]. This suggests that slag mobility should also be studied based on various density fractions contributing to the slag formation.…”

Section: Slag Mobilitymentioning

confidence: 93%

A Critical Review of Mineral Matter Related Issues during Gasification of Coal in Fixed, Fluidized, and Entrained Flow Gasifiers

Krishnamoorthy

Pisupati

2015

Energies

View full text Add to dashboard Cite

Gasification of coal is gaining more popularity due to its clean operation, and its ability to generate products for various markets. However, these technologies are not widely commercialized due to reliability and economic issues. Mineral matter in coal plays an important role in affecting the availability/reliability of a gasifier. Agglomeration in the bed, slag mobility and blockage of the syngas exit section are some of the operations related concerns in fixed-bed gasifiers, while ash deposition and sudden defluidization are the major concerns in fluidized bed gasifiers. In the case of entrained flow gasifiers, syngas cooler fouling and blockage, corrosion and erosion of refractory, and slag mobility are some of the major issues affecting the operations and the reliability of the gasifier. This review is aimed at critically examining various mineral matter related issues contributing to the operation and reliability problems in three types of generic gasifiers (fixed bed, fluidized bed and entrained flow gasifiers). Based on the review, some strategies to counter the potential mineral matter related issues are presented.

show abstract

“…Slag fluidity is generally characterized by ash fusion temperatures (AFTs) and viscosity, and the two parameters depend on temperature. 1 In addition, the typical slag viscosity for gasifier operation is in the range from 5 to 25 Pa•s, and this directly decides the operation temperature of the gasifier. 2 Therefore, the fluidity and corrosivity of slag are the main key factors for the stability and long-time operation of the entrained-flow gasifier.…”

Section: Introductionmentioning

confidence: 99%

Dissolution of Cr₂O₃ into Coal Slag and Its Impact on Slag Flow Properties

et al. 2020

View full text Add to dashboard Cite

In an entrained-flow coal gasifier, gasification slag derived from the melting of mineral matter in coal flows along the refractory wall and is tapped out. The refractory of spallation and dissolution enters into coal slag and can affect the slag flow properties, which are crucial for the entrained-flow gasifier's smooth operation. Cr 2 O 3 is one of the most common compositions of refractory materials and is selected to research the effect of refractory on the flow properties of slag. In this work, the dissolution of Cr 2 O 3 into coal slag is calculated by FactSage software, and its impact on ash fusion temperatures and slag viscosity are investigated. The Cr 2 O 3 concentration of coal slag increases from 0.5 to 4 wt % as the operation temperature rises (1300−1600 °C). Cr 2 O 3 reacts with FeO to form the high-melting point mineral donathite during the ash melting process, and the retention of FeO reduces the formation of low-melting point clinopyroxene, leading to the increase of ash fusion temperatures with the Cr 2 O 3 content. In addition, the slag viscosity increases with the Cr 2 O 3 content because of the increasing polymerization degree of the slag structure. Crystalline donathite formed by Cr 2 O 3 is precipitated first during the cooling process, and the precipitated donathite acts as the heterogeneous nucleus, promoting the precipitation of troilite and anorthite and thus increasing the critical viscosity temperature. This suggests that the high-chromia refractory material corrosion can cause the fluctuation of slag flowability and even lead to slag blockage. Therefore, the gasifier cannot be operated beyond the upper limit of operation temperature (1600 °C) for a long time to avoid the severe dissolution of refractory materials.

show abstract

Study on slag composition and flow property in a bench-scale OMB gasifier

Cited by 28 publications

References 18 publications

Unburned carbon from coal combustion ash: An overview

Unburned carbon from coal combustion ash: An overview

A Critical Review of Mineral Matter Related Issues during Gasification of Coal in Fixed, Fluidized, and Entrained Flow Gasifiers

Dissolution of Cr₂O₃ into Coal Slag and Its Impact on Slag Flow Properties

Contact Info

Product

Resources

About

Study on slag composition and flow property in a bench-scale OMB gasifier

Cited by 28 publications

References 18 publications

Unburned carbon from coal combustion ash: An overview

Unburned carbon from coal combustion ash: An overview

A Critical Review of Mineral Matter Related Issues during Gasification of Coal in Fixed, Fluidized, and Entrained Flow Gasifiers

Dissolution of Cr2O3 into Coal Slag and Its Impact on Slag Flow Properties

Contact Info

Product

Resources

About

Dissolution of Cr₂O₃ into Coal Slag and Its Impact on Slag Flow Properties