Valorization Method for Hard Coal as Fuel for Nonindustrial Combustion Installations with Special Regard to Reduction of Mercury Content

Dziok, Tadeusz; Strugała, A.; Baic, I.; Olszewska, Danuta

doi:10.1021/acs.energyfuels.9b04267

Cited by 9 publications

(6 citation statements)

References 34 publications

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“…38 It should also be mentioned that there is a further possibility to reduce the mercury content in coal by subjecting the clean coals to thermal pretreatment at 250 C. By so doing, the mercury content may be reduced to a level below 4.8 mg/GJ. 7 Figure 3 presents thermogravimetric curves of relative mass loss, along with temperature change of the analysed samples. Drying, primary and secondary pyrolysis, as well as gasification can be distinguished by means of these curves.…”

Section: Resultsmentioning

confidence: 99%

“…One of the limitations is that the higher heating value is lower than 6 MJ/kg. The calorific value of the rejects from the hard coal dry deshaling using the FGX separator can be very diverse 6,7 It depends, among others, on the properties of raw coal (feed coal). The low calorific value of the rejects may be obtained by using feed coals characterised by relatively high grain size, above 6 mm.…”

Section: Introductionmentioning

confidence: 99%

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Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO₂ gasification process

Czerski

Grzywacz

Dziok

et al. 2020

Intl J of Energy Research

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The dry deshaling process using the FGX method is a modern technique of coal quality enhancing without the use of water. The positive effect of this operation is the increase of calorific value and the removal of contaminants such as sulphur, chlorine, mercury and other heavy metals along with the separated gangue. However, elements such as sodium, potassium or calcium, considered as catalysts in the gasification process, are also partially removed. Consequently, the global effect of the dry deshaling on coal reactivity, being a key parameter determining its suitability for the gasification, is hard to predict. This study aims to determine the impact of dry deshaling of coal by FGX separator on its reactivity. Using TG analysis, 10 samples of coals from Polish mines, before and after the dry deshaling at commercially working FGX separator, were gasified in CO 2 atmosphere under non-isothermal conditions. The effect of deshaling on the basic properties of coals, ash composition and the content of contaminants such as sulphur and mercury, was also determined. The results showed slightly lower reactivity of clean coals. The values of kinetic parameters of gasification reaction were similar, or an increase in the activation energy value was compensated by the higher value of the pre-exponential factor. The basic properties of coals and the content of sulphur and mercury have changed after the deshaling process, and the magnitude of these changes differed significantly among the samples analysed. The changes in the ash composition were insignificant. These results suggest that FGX technology may be an attractive way of coal preparing for the gasification, resulting in a reduction of byproducts and contaminants without adverse effect on coals reactivity. K E Y W O R D S CO 2 gasification, coal, dry deshaling, non-isothermal TGA, upgrading of coal 1 | INTRODUCTION So as to allow efficient and ecological conversion of this fossil fuel, coal can be gasified. 1 Before thermochemical use, however, coal is directed to processing processes aimed at reducing ash content and increasing heating value, this being the first stage of applying Clean Coal Technologies. One such method of coal preparation is the

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO₂ gasification process

Czerski

Grzywacz

Dziok

et al. 2020

Intl J of Energy Research

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“…The total analytical sulfur content S t a and the sulfur content in the working fuel S t r were also examined. The high-temperature combustion method with IR detection was used to perform the measurement [24,25]. In the analyzed hard coal, the sulfur content was tested in accordance with the PN-G-04584: 2001 standard.…”

Section: Methodsmentioning

confidence: 99%

Study of Selected Parameters of Coal Burned in a Combined Heat and Power Plant

Paśnikowska-Łukaszuk¹

2021

Adv. Sci. Technol. Res. J.

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The paper discusses the use of fossil fuels and the process of their extraction in Poland. Hard coal used on a daily basis in one of the Polish combined heat and power plants was described, followed by monthly measurements of coal parameters. Daily and total analyzes of the obtained measurement results of hard coal were carried out in accordance with the applicable standards. The differences in the values of coal from the same source but imported at different time intervals are shown, which result from the weather conditions and the method of hard coal storage. Negative correlations occurred between ash content and calorific value, heat of combustion and volatile matter, as detailed in the work conclusions.

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“…It is also possible to significantly reduce the mercury content in hard coal using a combination of the cleaning process and the thermal pre-treatment process at 250°C. This method allows the mercury content in hard coal to be reduced to less than 4.8 μg/MJ (Dziok et al 2020). The lowest mercury content was recorded for biomass fuels, in particular after thermal treatment (torrefied biomass, biocarbon, and charcoal) as well as for fuels produced from hard coal in the pyrolysis process (coal char and coke).…”

Section: Comparison Of Mercury Content In the Fuels Analyzedmentioning

confidence: 99%

The possibility of reducing emissions from households by using coal briquettes

Dziok¹,

Penkała²

2020

Polityka Energetyczna – Energy Policy Journal

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The expected demand for hard coal intended for the households will progressively be decreasing. This is directly related to the introduced anti-smog resolutions, as well as the growing level of environmental awareness. However, it should be noted, that the use of the modern home heating boilers will result in an increase in the demand for medium coal sizes. The shortfall of this type of coal is already observed on the market. Therefore, its import is necessary. One of the solutions to increase the supply of the medium coal sizes is the production of coal briquettes. Moreover, their use will consequently lead to reduced emissions. The paper presents a comparison of emissions from the combustion of coal briquettes and hard coal in home heating boilers. The briquettes were characterized by significantly lower emissions than hard coal (by 52% on average). The particulate matter emissions were lower by 70%. This may significantly contribute to improving air quality in Poland and in addition, limit the occurrence of smog. The possibility of further emission reduction by using low-emission fuels as briquette components was presented. The average relative emission reduction compared to hard coal for the analyzed fuels was estimated as follows: 62% for coal char, 57% for coke, 51% for charcoal/biocarbon, 49% for anthracite, 45% for torrefied biomass, and 33% for peat. Furthermore, the issue of the mercury content in the analyzed fuels was discussed. The lowest mercury content was found in biomass fuels, in particular biomass after thermal treatment (torrefied biomass, biocarbon, and charcoal). Fuels produced from hard coal in the pyrolysis process (coal char and coke) were characterized by very low mercury content as well.

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Valorization Method for Hard Coal as Fuel for Nonindustrial Combustion Installations with Special Regard to Reduction of Mercury Content

Cited by 9 publications

References 34 publications

Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO₂ gasification process

Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO₂ gasification process

Study of Selected Parameters of Coal Burned in a Combined Heat and Power Plant

The possibility of reducing emissions from households by using coal briquettes

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Valorization Method for Hard Coal as Fuel for Nonindustrial Combustion Installations with Special Regard to Reduction of Mercury Content

Cited by 9 publications

References 34 publications

Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO2 gasification process

Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO2 gasification process

Study of Selected Parameters of Coal Burned in a Combined Heat and Power Plant

The possibility of reducing emissions from households by using coal briquettes

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Product

Resources

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Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO₂ gasification process

Experimental evaluation of the dry coal deshaling by pneumatic vibrating FGX separator on the CO₂ gasification process