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

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

doi:10.1016/j.fuproc.2005.06.007

Cited by 96 publications

(95 citation statements)

References 5 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%

“…Moreover, it was reported that the release of Na would be inhibited under the reducing atmosphere (Kosminski et al, 2006b). This indicates fouling will be alleviated during Zhundong coal gasification, compared with Zhundong coal combustion.…”

Section: Introductionmentioning

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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“…Walk et al [13] identified that catalytic ability of AAEMs on CO2 gasification decreased in the order of Na > K > Ca from anthracite to lignite, and pointed the catalytic ability was dependent on the concentration, chemical forms, and dispersion of AAEMs in coal. Meanwhile, several other studies focused on the transformation of Na, Cl and silica [10,[14][15][16]. Kosminski et al [15,16] examined the transformation of Na during the gasification of South Australian lignite.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, several other studies focused on the transformation of Na, Cl and silica [10,[14][15][16]. Kosminski et al [15,16] examined the transformation of Na during the gasification of South Australian lignite. Their results indicated that release of Na and Cl was disproportionate to NaCl in coal.…”

Section: Introductionmentioning

confidence: 99%

CO<sub>2</sub> Gasification Reactivity of Chars Derived From Zhundong Coal

Guan

Zhang

2017

Preprint

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“…In previous research on gas turbine engine degradation and coal combustion process [5,6,7], it has been observed that carbonate salts of sodium and potassium dissolve SiC, because the passivating silica surface protecting the silicon carbide is removed by the fluxing action of the sodium or potassium ions as well as impurities that are present in the gaseous environment. This hot corrosion approach has been selected to address the reprocessing challenge due to its high corrosion rate of SiC.…”

Section: Introductionmentioning

confidence: 99%

Separation of Nuclear Fuel Surrogates from Silicon Carbide Inert Matrix

Baney¹

2008

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Project End Date: September 12, 2008 (with a six mo. no cost extension) Research ObjectivesThe objective of this project has been to identify a process for separating transuranic species from silicon carbide (SiC). Silicon carbide has become one of the prime candidates for the matrix in inert matrix fuels ,(IMF) being designed to reduce plutonium inventories and the long halflives actinides through transmutation Since complete reaction is not practical it become necessary to separate the non-transmuted materials from the silicon carbide matrix for ultimate reprocessing. This work reports a method for that required process.An efficient process has been developed for separating transuranic species from a silicon carbide (SiC) matrix. At high temperature (above 850 ºC) SiC can be oxidized in molten alkali salt such as sodium carbonate (Na 2 CO 3 ) and potassium carbonate (K 2 CO 3 ) and form water soluble products such as sodium or potassium silicate. SiC fine powder (1micron) was totally dissolved in Na 2 CO 3 molten salt after 30 min heat treatment at 900 ºC. SiC pellets were completely dissolved in K 2 CO 3 molten salt after approximate 40 hours heat treatment at 1050 ºC. Separation was achieved by dissolving the products obtained from SiC corrosion in water. Ceria (CeO 2 ) remained unchanged and was not corroded in these molten salt environments.

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

Cited by 96 publications

References 5 publications

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

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

CO<sub>2</sub> Gasification Reactivity of Chars Derived From Zhundong Coal

Separation of Nuclear Fuel Surrogates from Silicon Carbide Inert Matrix

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