swelling index

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swelling index

  1. 1. Lab report Energy Engineering labTitle: To determine the swelling index of coalApparatus: Transparent crucible Gas burner standTheory:Free swelling index (FSI) is an important parameter for coke ability and combustion of coals.The free swelling index in British Standards Index (BSI) nomenclature (the crucible swellingindex number (CSN) in ISO nomenclature) is a measure of increase in the volume of coalwhen heated, with the exclusion of air. This parameter is useful in evaluating coals for cokingand combustion. This parameter is useful in evaluating coals for coking and combustion.Coals with a low free swelling index (0-2) are not suitable for coke manufacture. Coals withhigh swelling numbers (+8) cannot be used by themselves to produce coke, as the resultantcoke is usually weak and will not support the loads imposed within the blast furnace.When bituminous coals are heated, they develop plastic properties at about 350 °C and as aresult. Exhibit fluidity, swelling, expansion and contraction in volume and after carbonizationproduce a coherent residue the strength of which depends on the ranking of the coal. Thisplastic property of coals is commonly indicated in the free swelling index,When many bituminous coals are heated, they soften and form a plastic mass that swells andresolidifies into a porous solid. Coals that exhibit such behaviour are called caking coals.Strongly caking coals, which yield a solid product (coke) with properties suitable for use in ablast furnace, are called coking coals. All coking coals are caking, but not all caking coalsare not coking coal.Procedure:I took the crucible and directly placed it on flame. After heating sometime it was transferredto the table, took the balance. Weighted it in cold state. Level it by tapping it on solid surfacerotating it betweens taps. Cover the crucible with lid and it upright silica triangle. Support inthe draft directly; cover the gas flame for time required for burning the volatile matter die out,but in any case not less than 2.5 minutes. Remove the coke bottom carefully and remove thecarbon residue remaining in the crucible due to ignition.Swelling index of coal Page | 1
  2. 2. Lab report Energy Engineering labResult:There is no swelling in coal.Discussion:  There is no swelling in the coal. Because this is inferior type of coal. So there Is no swelling in this type.  The temperature of crucible should be reached to 850°C within 2.5 minutes. But the gas pressure here is low as compared required.  The apparatus which is available here for swelling index determination is not proper.Swelling index of coal Page | 2

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