. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . trikes against the firebox sheets, and re-sults in the accumulation of a relativelysoft, light, ashy substance that grows orspreads over certain areas of the arch andthe metal parts of the furnace. With the use of pulverized fuel theusual difl^culties resulting from theformation of hard and soft clinker areeliminated, but with fuels containing cer-tain intrinsic combinations of ferrous sili-cates, which fuse at comparatively lowtemperatures (2,000 to 2,300 degs. Fahr.),the honeycomb formation
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . trikes against the firebox sheets, and re-sults in the accumulation of a relativelysoft, light, ashy substance that grows orspreads over certain areas of the arch andthe metal parts of the furnace. With the use of pulverized fuel theusual difl^culties resulting from theformation of hard and soft clinker areeliminated, but with fuels containing cer-tain intrinsic combinations of ferrous sili-cates, which fuse at comparatively lowtemperatures (2,000 to 2,300 degs. Fahr.),the honeycomb formation will resultwhen the proper air supply and com-bustion conditions do not obtain. Thenferric silicates, which fuse at relativelyhigh temperatures (2,500 degs. Fahr. andabove) are formed. For example, dur-ing the process of combustion ferric sul-phide (FeS:), commonly known as ironpyrites, is reduced to ferrous sulphide(FeS) as the result of the chemical re«duction may be illustrated by the follow-ing formula: FeS, = FeS -f S. As ferrous sulphide (FeS) melts at acomparatively low temperature (2,138. SEdKITV IIRK K AKCII FORMINi; FIRNACE Ft)R PULVER-IZED FUEL. boiler capacity and efficiency, and pro-duces heavy expense in delays for clean-ing fires and ash pans and in the finaldisposition of the ash. The clinkcringand honeycombing of ash is one of theworst troubles to be dealt with in thecombustion of coal, and its formation degs. Fahr.), it may surround itself withfuel and ash, and form a pasty masswhich may act as a binder to, collect otherferrous sulpliide (FeS), fuel and ash, allof which may tend to collect on, and ad-here to, the hottest parts of the fireboxsheets, such as staybolt heads, flue beads I AND 1. MOTlVii KNGINKKKINC. Janiiarv. \^\7 and like parts, which arc higher in tcm-]icraturi than the mchiiig point offerrous sulphide (FeS) and the sur-rounding nul;d surfaces, wliile tlie leni-Icrature nf the latter may he lower thanilie meltiiiK point of the ferrous sulphide
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
