Investigations into the control of agglomeration and defluidisation during fluidised-bed combustion of low-rank coals

Vuthaluru, Hari; Linjewile, Temi M.; Zhang, Dongke; Manzoori, A.Reza

doi:10.1016/s0016-2361(98)00165-3

Cited by 70 publications

(46 citation statements)

References 4 publications

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“…The increased ash deposition as well as the changed properties of the ash deposits containing low-melting compounds such as K, Na, S and Ca would form a kind of coating on the bottom ash particles, which is partly in a liquid form, and begin to bind the particles together like glue [40], leading to agglomeration of the ash particles in the combustor. Bed agglomeration would eventually cause de-fluidization for a fluidized bed combustor, which would hence result in greatly reduced combustor utilization efficiency.…”

Section: Challenges With Ash Deposition In a Biomass-fired Or Co-firementioning

confidence: 99%

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

et al. 2012

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This paper presents a concise overview of ash deposition in combustion or co-firing of biomass (woody biomass, agricultural residues, peat, etc.) with other fuels for power/heat generation. In this article, the following five research aspects on biomass combustion ash deposition are reviewed and discussed: influence of biomass fuel characteristics, deposit-related challenges, ash deposition monitoring and analysis of ash deposits, mechanisms and chemistry of fly ash deposition, and key technologies for reducing ash deposition and corrosion in biomass-involved combustion.

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Section: Challenges With Ash Deposition In a Biomass-fired Or Co-firementioning

confidence: 99%

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

et al. 2012

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“…If the sintered particles become too large, partial or complete defluidization of the bed will occur. Sintering and agglomeration are more problematic in the utilization of low-rank coals due to the presence of significantly larger amounts of organically bound inorganic matter that are released at low temperatures [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Effect of sodium compounds on the sintering propensity of coal-associated minerals

Nel

Strydom

Schobert

et al. 2015

Journal of Analytical and Applied Pyrolysis

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“…For example, silicon (Si)-rich minerals were found to be good sorbents for retaining Na-based compounds within coal ash, reducing the possibility of fouling in boiler tails (Kyi and Chadwick, 1999). Aluminum (Al)-rich minerals could increase the melting points of ash particles to inhibit the formation of low-temperature eutectics (Linjewile and Manzoori, 1999;McCullough et al, 2011;Van Eyk et al, 2012;Vuthaluru et al, 1999;Wei et al, 2016;Xu et al, 2014). Phosphorus (P)-rich sludge could effectively retain alkali metals in residual ash in the form of high-melting-point phosphates, avoiding defluidization of biomass in FB (Li, 2014).…”

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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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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Investigations into the control of agglomeration and defluidisation during fluidised-bed combustion of low-rank coals

Cited by 70 publications

References 4 publications

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation

Effect of sodium compounds on the sintering propensity of coal-associated minerals

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

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