Calculation of qualitative and quantitative composition of Estonian oil shale and its combustion products. Part 1. Calculation on the basis of heating value☆

Arro, H.; Prikk, A.; Pihu, T.

doi:10.1016/s0016-2361(03)00125-x

Cited by 34 publications

(42 citation statements)

References 2 publications

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“…Prior to practical dew point measurements in CFB boilers, the value of the dew point of flue-gas water steam was calculated basing on the average composition of oil shale whose calorific value is in the range of Q r i = 8.30-8.50 MJ/kg, estimated using the method described in [7]. In calculations the following numerical values were used: moisture content W r i = 11-14% and excess air content at α = 1.20 (O 2 = 3.5%).…”

Section: Dew Point Of Flue Gasmentioning

confidence: 99%

Corrosion of Air Preheater Tubes of Oil Shale CFB Boiler. Part I. Dew Point of Flue Gas and Low-Temperature Corrosion

Pihu

Arro²,

Prikk³

et al. 2009

Oil Shale

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Section: Dew Point Of Flue Gasmentioning

confidence: 99%

Corrosion of Air Preheater Tubes of Oil Shale CFB Boiler. Part I. Dew Point of Flue Gas and Low-Temperature Corrosion

Pihu

Arro²,

Prikk³

et al. 2009

Oil Shale

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“…The calculations were based on the average ash water data ( Table 1). The CO 2 amounts produced in boilers were calculated on the basis of the oil shale heating value and the extent of carbonate decomposition (k CO2 ) as described in [8].…”

Section: Alkaline Ash Water Neutralisation By Flue Gasesmentioning

confidence: 99%

“…When 1 kg of oil shale, with the heating value of 8.4 MJ/kg, is combusted in a boiler, the estimated amount of CO 2 produced is ~20.5 moles/kg [8]. Thus, the stoichiometric amount of CO 2 obtained from combusting 1 ton of oil shale would be sufficient to neutralise approximately 270 m 3 of ash water.…”

Section: Alkaline Ash Water Neutralisation By Flue Gasesmentioning

confidence: 99%

Estonian oil shale power plants’ ash handling problems

Arro¹,

Loosaar²,

Pihu³

et al. 2007

WIT Transactions on Ecology and the Environment, Vol 105

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Over 90% of the Estonian basic power supply is covered by oil shale-fired thermal power plants. Every year about 11 million tons of oil shale (ash content 45-47%) is fired. The old pulverised firing (PF) and the new circulated fluidised bed (CFB) technologies are used. The PF boilers were commissioned between 1959 and 1973. Due to their age and problems relating to environmental and economical performance, two old blocks were replaced using the CFB technology. The new CFB units (2x215 MWel) delivered by Foster Wheeler started operation in [2003][2004] and are meeting the EU LCP Directive limits of gaseous emissions without any additional flue gas cleaning equipment.The most serious problem today is ash handling. Power plants (PP) using big amounts of water for ash handling are not known in Europe and are environmentally hazardous. In compliance with the EU directives the oil shale power plants must be switched over to a technology which minimises high alkaline liquid waste (dry, semidry or dense slurry technology) from July 2009. Before taking a final decision, it has to be found out what might be involved in adopting the new technology and what problems might emerge. Whatever technology we use for ash removal, ash fields come into contact with millions of cubic metres of rainwater a year which becomes polluted. The question of how to neutralise free lime in oil shale ash as one of the most hazardous components seems to be a particularly important question. This paper describes the problems relating to the chemical-mineralogical composition of oil shale ash. The conditions at hydro (wet), dry, or semidry ash removal are analysed.

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“…The oil shale heating value is correlated with the concentrations of elements C, H, O, S, N, and Cl in the organic fraction of oil shale [10]. However, these elements are also present in large quantities in inorganic fraction of oil shale.…”

Section: Introductionmentioning

confidence: 99%

Determination of Heating Value of Estonian Oil Shale by Laser-Induced Breakdown Spectroscopy

Aints¹,

Paris²,

Laan³

et al. 2018

Journal of Spectroscopy

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The laser-induced breakdown spectroscopy (LIBS) combined with multivariate regression analysis of measured data were utilised for determination of the heating value and the chemical composition of pellets made from Estonian oil shale samples with different heating values. The study is the first where the oil shale heating value is determined on the basis of LIBS spectra. The method for selecting the optimal number of spectral lines for ordinary multivariate least squares regression model is presented. The correlation coefficient between the heating value predicted by the regression model, and that measured by calorimetric bomb, was R 2 = 0 98. The standard deviation of prediction was 0.24 MJ/kg. Concentrations of oil shale components predicted by the regression model were compared with those measured by ordinary methods.

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Calculation of qualitative and quantitative composition of Estonian oil shale and its combustion products. Part 1. Calculation on the basis of heating value☆

Cited by 34 publications

References 2 publications

Corrosion of Air Preheater Tubes of Oil Shale CFB Boiler. Part I. Dew Point of Flue Gas and Low-Temperature Corrosion

Corrosion of Air Preheater Tubes of Oil Shale CFB Boiler. Part I. Dew Point of Flue Gas and Low-Temperature Corrosion

Estonian oil shale power plants’ ash handling problems

Determination of Heating Value of Estonian Oil Shale by Laser-Induced Breakdown Spectroscopy

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