Characterization of feed coal and combustion by-products from Kemerkoy power plant in Turkey

Sen, Gul Akar; Yılmaz, Hatice; Sen, Shamik; Arslan, Vedat; Ipekoglu, Uner

doi:10.1007/s12517-019-4433-x

Cited by 6 publications

(2 citation statements)

References 39 publications

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“…Due to its low ash content, high volatility, and high calorific value, Zhundong coal is considered to be a kind of high-quality power coal. , However, serious fouling and slagging occur during the combustion of Zhundong coal. It is generally believed that the high content of alkali metal and alkaline earth metals (AAEMs) in coal is the main reason for fouling and slagging. , Most of AAEMs in the Zhundong coal can volatilize below 1000 °C and then enter the flue gas . The gaseous AAEMs in the flue gas can condense on the heat exchange surface and react with other minerals including silica and iron oxide at high temperatures to form more viscous particles, thus capturing more ash particles, forming thick deposits and causing severe slagging. , At present, several measures have been proposed and applied to coal-fired power plants, including measures of adding Jinggong coal, reducing the heat release in the furnace volume, and removing the slag and ash deposits .…”

Section: Introductionmentioning

confidence: 99%

“…It is generally believed that the high content of alkali metal and alkaline earth metals (AAEMs) in coal is the main reason for fouling and slagging. 5,6 Most of AAEMs in the Zhundong coal can volatilize below 1000 °C and then enter the flue gas. 7 The gaseous AAEMs in the flue gas can condense on the heat exchange surface and react with other minerals including silica and iron oxide at high temperatures to form more viscous particles, thus capturing more ash particles, forming thick deposits and causing severe slagging.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Struvite Addition on Relieving the Slagging Tendency during Zhundong Coal Combustion

Jin

Yang

et al. 2019

Energy Fuels

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Zhundong coal is a kind of high-quality power coal, but serious fouling and slagging may occur due to the rich content of alkali and alkali earth metals (AAEMs). Combustion experiments were carried out on an electrically heated tube furnace at different temperatures in air atmosphere. The raw coal and its mixtures with struvite additive (2−8 wt % of coal mass) were respectively burned in air atmosphere. Combustion-generated ashes were collected and analyzed by inductively coupled plasma−optical emission spectroscopy, X-ray diffractometry, and scanning electron microscopy−energy dispersive spectroscopy. Results show that the mixed coal ash at high temperatures has a looser and more brittle structure than the raw coal ash and is more easily removed. With the introduction of struvite, whitlockite and chladniite appear, which improves the melting temperature of the mixed coal ash, while gehlenite (Ca 2 Al 2 SiO 7 ) and akermanite (Ca 2 MgSiO 7 ) disappear. The high content of calcium in Zhundong coal leads to the formation of a low-temperature eutectic with some minerals such as Al and Si at temperatures higher than 1000 °C. Ca separates out after these minerals melt, flows within the flue gas, and congeals on the heating surfaces, causing serious slagging. The fixation rate of Ca in the mixed coal ash blended with struvite increases obviously. The optimum addition of struvite is 4%.

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