Identifier: jeffersonberkele00west (find matches)
Title: Jefferson, Berkeley, and Morgan counties, by G.P. Grimsley, assistant geologist. I.C. White, state geologist
Year: 1916 (1910s)
Authors: West Virginia Geological and Economic Survey Grimsley, George Perry, 1868-
Subjects: Geology
Publisher: (Wheeling)
Contributing Library: West Virginia University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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e draught in that it would carry a portion of the ashesinto the kiln there to be fused or included with the lime. Jfthe ash is high in silica or alkalies, or sulphur, the troublewould be increased, and there is a general tendency to colorthe lime by this action. In the air draught, compressed air is forced through apipe to the fire-boxes of the kiln and increases the temperatureby insuring complete combustion of the fuel, and further car-ries the flame and heat well up into the kiln. There is amarked saving in fuel and increase in capacity of the kiln.Against the use of forced air draught, it is claimed that thetemperature is raised so high in the lower part of the kiln thattlic lime is burned too quickly causing the rock to break intosmall lumps which on exposure to the air rapidly slake. It isalso iii^cd thai the air-blast introduces a large amount of airinto the kiln and so slakes the linn.. The ordinary slaking ollinn- 011 exposure to tin- ail is due to the absorption of moisture,
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WEST VIRGINIA GEOLOGICAL SURVEY. 481 forming the hydrate. If dry air is used in the forced draughtthere could be no air-slaking, and even if the air was moistthere would be no absorption of moisture at the high temper-ature of the kiln. Further the breaking of the lime into smallpieces prevents air-slaking rather than increasing it, on ac-count of the surface protective coat formed over the finer lime. In the use of a forced draught it is important that therequisite amount of air should be used, an excess of supplywill prove wasteful of fuel. The air should also be heated, ora considerable amount of the available heat of the fire will beconsumed in heating the air. The admission of cold air belowthe grate-bars in the forced air draught is very wasteful ofheat and also soon destroys the grate-bars. In the Shoop kiln which is used in several plants inBerkeley and Morgan Counties, the cooling lime in the lowerpart of the kiln gives off heat which is drawn through an open-ing and passes u

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