The Investigation of Mercury Contents in Polish Coal Samples

Wichliński, Michał; Kobyłecki, Rafał; Bis, Zbigniew

doi:10.2478/aep-2013-0019

Cited by 25 publications

(18 citation statements)

References 10 publications

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Section: Introductionmentioning

confidence: 95%

“…[8][9][10][11] the Polish hard coals contain roughly 100 ng/g of mercury that is an average value compared to the data for other coals in the world. It has to be emphasized, however, that the mercury content in lignite (brown coal) is much higher and often exceeds 200 ng/g [8][9][10][11]. Since so far the concentration of mercury was mainly reported for Polish coal samples [9][10][11] there is still a lack of data for other possible Hgcontaining substances, such as e.g.…”

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Emission of Mercury From Polish Large-Scale Utility Boilers

Kobyłecki¹,

Wichliński²,

Wielgosz³

et al. 2016

J. Ecol. Eng.

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The article presents the results of investigations focused on the determination of mercury content in gas and solid samples. The emission of Hg was the result of coal combustion. The investigations were carried out in the selected power generation facilities operated with pulverized coal and circulating fluidized bed boilers. Analysis was carried out for the flue gases, as well as fuel and sorbent samples and the by-products of the combustion process (fly ash, slag, bottom ash, and the products of wet desulfurization technology). The determination of mercury content in solid samples was carried out using Lumex RA-915+ spectrometer with RP-91C attachment. The measurements of the mercury concentration in the flue gases were performed according to the cold vapor technique. The analysis of the results indicated that the main source of mercury is coal, but significant concentration was also determined for the biomass co-combusted in one of the facilities. Considerable amounts were also determined in fly ash and wet FGD (flue gas desulfurization) samples.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

Emission of Mercury From Polish Large-Scale Utility Boilers

Kobyłecki¹,

Wichliński²,

Wielgosz³

et al. 2016

J. Ecol. Eng.

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“…The second group of methods called 'precombustion methods' is focused on mercury removal from the fuel before its combustion in power plants. Those methods are briefly described in the publication of Wichliński and others [9]. Particular focus is put to a low temperature thermal treatment of fuel (LT3).…”

Section: Introductionmentioning

confidence: 99%

“…The recently reports indicate that mercury content in coal in the world varies significant and, in some extreme cases, could reach up to 1000 ng/g [3]. The Polish coals were also examined and several authors report that the average mercury content in Polish hard coals combusted for power generation is roughly 80 ng/g [4][5][6][7]. Even though Hg content in Polish is relatively low.…”

Section: Introductionmentioning

confidence: 99%

Application of low-temperature thermal treatment for the reduction of mercury content in coal

2016

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Abstract. The article describes research carried out on four coals samples (raw coals A and B and enriched coals A and B). The fuels were subjected to low-temperature thermal treatment in order to remove as much mercury as possible while still maintaining high energy quality of the fuels. The lab-scale tests were performed in a fluidized bed column and for chosen coal fraction 500-1000m. Air and a mixture of carbon dioxide (16%) and nitrogen (the rest) were used as the fluidizing medium that as intended to have similar composition as the synthetic flue gas. The coals were tested for five temperatures of 200, 250, 300, 350 and 400°C.The results indicated that it was possible to remove more than 80% of mercury from coal A (raw and enriched), in CO 2 /N 2 atmosphere at the temperature of 400°C in the case of coal B, both raw and enriched, the amount of removed mercury at 400°C was roughly 70%. At lower temperature, 350°C, the amount of removed mercury was 70% and 60% for coals A and B, respectively. Apart from the above test the investigation were also carried out in order to determine the loss of volatiles during the thermal treatment of the coals. The results indicated that at 400 o C roughly 20% of the volatiles were evolved from the fuel particles. The loss of elemental carbon and fuel higher heating value (HHV) after the treatment were 10% and 8%, respectively.

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“…As a result, mercury emitted from fossil fuel combustion plants may exist in three forms, i.e. either elemental mercury (volatile metallic mercury) gas, Hg0,oxidized gaseous mercury (volatile ionic mercury), Hg 2+ , or mercury adsorbed on dust particles, Hg(p) [4,7].Due to very low mercury content in coals (usually 80-100 ng/g as in the case of Polish coals [16,17,18]) and its random distribution in fuel particles the exact measurement of mercury becomes quite difficult. Most common mercury analyzers are operated based on atomic adsorption spectrometry with atomic vapor generation (CV-AAS).…”

Section: Introductionmentioning

confidence: 99%

Mercury emissions from polish pulverized coalfired boiler

2017

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Abstract. The current paper presents the research results carried out at one of Polish power plants at a pulverized hard coal-fired 225 MW unit. The research was carried out at full load of the boiler (100% MCR) and focused on analysis of mercury content in the input fuel and limestone sorbent for wet flue gas desulfurization (FGD) system, as well as investigation of mercury content in the combustion products, i.e. fly ash, slag, FGD product (gypsum) and FGD effluents (waste). Within the framework of the present study the concentration of mercury vapor in the exhaust gas was also investigated. The analysis was performed using Lumex RA-915+ spectrometer with an attachment (RP-91C). The measurements were carried out at three locations, i.e. before the electrostatic precipitator (ESP), downstream the ESP, and downstream the wet FGD plant. Design of the measurement system allowed to determine both forms of mercury in the flue gas (Hg 0 and Hg 2+ ) at all measurement locations.Based on the measurement results the balance of mercury for a pulverized coal (PC) boiler was calculated and the amount of mercury was assessed both in the input solids (fuel and sorbent), as well as the gaseous and solids products (flue gas, slag, ash, gypsum and FGD waste).

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The Investigation of Mercury Contents in Polish Coal Samples

Cited by 25 publications

References 10 publications

Emission of Mercury From Polish Large-Scale Utility Boilers

Emission of Mercury From Polish Large-Scale Utility Boilers

Application of low-temperature thermal treatment for the reduction of mercury content in coal

Mercury emissions from polish pulverized coalfired boiler

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