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Anuwat Luxsanayotin Full Text Available Slagging is one of major ash deposition problems experienced in the boilers of coal—fired power plants especially theplants that use lignite, like Mae Moh lignites.

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The occurrence of slag is a complex phenomenon depending on several factorssuch as ash properties, furnace operating conditions, and coal properties. The main objective of this work is to study theeffect of mineral components in Mae Moh lignite on ash fusion temperatures AFTs, which is commonly used as a keyindicator for slag formation tendency under pulverized combustion conditions.

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Two Mae Moh lignites from the coal seamsplanned to be used in the future were selected for the study to represent low CaO and high CaO lignite. The two lignites,namely K1 and K3, have 3.

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The AFT characterization shows that their initial deformationtemperatures ITs were almost identical and considered as low for the typical flue gas temperature in the radiationsection of Voimaluste luhend Moh boilers, i.

The X-ray diffraction analyses evidently show the presence of illite, pyriteand anhydrite in K1, which explains the observed lower IT of PSX Share Option Tehingud sample. Anhydrite, which is known to lower the ITs, is alsothe most abundant mineral in K3. When the CaO is added to the low CaO samples, the fluxing effect will initially occur.

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However, when the CaOcontent is higher than a critical value i. Ternary phase diagrams «.

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