Reactions between sodium and kaolin during gasification of a low-rank coal

Kosminski, A.; Ross, D.P.; Agnew, John B.

doi:10.1016/j.fuproc.2005.06.004

Cited by 112 publications

(75 citation statements)

References 8 publications

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“…In addition to Na 2 SO 4 , the NaCl and organic Na in TCMLc also possibly reacted with SiO 2 forming the above Na-based compounds (Kosminski et al, 2006a(Kosminski et al, , 2006b). Since these formed Na silicates or aluminosilicates were nonvolatile, the two retentions including residual char mass and Na increased.…”

Section: Reactions Between Minerals and Zhundong Coal Ashmentioning

confidence: 99%

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Effect of bed materials on slagging and fouling during Zhundong coal gasification

Song

et al. 2017

Energy Exploration & Exploitation

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The suitable bed material is important to inhibit ash-related problems including agglomeration and slagging in furnace and fouling on tail heated surfaces during coal gasification in fluidized bed. For newfound high-alkali vast-reserve Zhundong coal in China, the selection of bed material in fluidized bed should be paid more attention because of its more serious ash-related issues. Five bed materials including quartz, kaolin, corundum, sludge ash, and phosphate rock were used to investigate their feasibility to solve the ash-related issues of two typical types of Zhundong coal including Tianchimulei coal and Shaerhu coal. All of five bed materials could effectively impact the release and transformation of alkali and alkaline earth metal species, especially Na species. The capture order of Na by five bed materials from high to low was sludge ash, quartz, kaolin, corundum, and phosphate rock for the two types of coal, and ash fusion temperatures of residual ash added different bed materials were in orders of phosphate rock > corundum > sludge ash > kaolin > quartz for Tianchimulei coal and corundum > phosphate rock > sludge ash > kaolin > quartz for Shaerhu coal. This influence of bed materials was mainly related to their chemical compositions, especially Al-, Si-, and P-based compounds. Due to the strong capture of alkali and alkaline earth metal-based compounds and high ash fusibility temperature, sludge ash was suggested as the appropriate selection of the bed material during Zhundong coal gasification in fluidized bed. Moreover, this suggestion would contribute to the sewage sludge treatment.

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Section: Reactions Between Minerals and Zhundong Coal Ashmentioning

confidence: 99%

“…Although the reactions between Al 2 O 3 and Na-based compounds were not obvious, the reactions still occurred at 900 C forming Na aluminates (Kosminski et al, 2006a;Kyi and Chadwick, 1999). The possible reactions are as follows (reactions (17) and (18)…”

Section: Reactions Between Minerals and Zhundong Coal Ashmentioning

confidence: 99%

Effect of bed materials on slagging and fouling during Zhundong coal gasification

Song

et al. 2017

Energy Exploration & Exploitation

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“…This is likely due to the interaction of sodium with silica forming a melt phase. Kosminski et al conducted studies in a small-scale tubular furnace to determine the level of interaction behavior of sodium species with silica and aluminosilicates in gasification environments [25,26]. It was observed that a portion of organically-bound sodium, in carboxylic functional groups, decomposes to form sodium carbonate, which in turn reacts with silica to form liquid sodium disilicates and other silicates at 1123 K under N2, CO2, and steam atmospheres [25].…”

Section: Role Of Inorganic Interactions In Agglomerate and Deposit Fomentioning

confidence: 99%

“…The suitability of additives is dependent upon the prospect of forming high melting phases by interacting with the fouling components particularly alkalis. For example, kaolinite is widely used additive to trap sodium [26]. At high temperatures, kaolinite structures decompose to form meta-kaolinite.…”

Section: Strategies To Minimize Agglomeration and Ash Depositionmentioning

confidence: 99%

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

Krishnamoorthy

Pisupati

2015

Energies

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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.

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“…Their results indicated that release of Na and Cl was disproportionate to NaCl in coal. Kosminski et al [17] also investigated the reaction between Na and silica or kaolin, and found liquid sodium silicates were major reaction products of Na and silica.…”

Section: Introductionmentioning

confidence: 99%