Steam power plants, their design and construction . in localities where thereis likely to be an interruption in the supply of fuel. With plants as small as 500 or 600 horse power in boilers, coal-handling machinery is frequently installed. It usually consistsof a receiving hopper, into which the coal is delivered, feeding STEAM POWER PLANTS. 149 to an endless chain of buckets which elevates and conveys thecoal to bunkers placed over the boilers; spouts lead from thebunkers to the floor near the furnace doors of the boilers if theyare hand fired or to mechanical stokers if the latter are provid
Steam power plants, their design and construction . in localities where thereis likely to be an interruption in the supply of fuel. With plants as small as 500 or 600 horse power in boilers, coal-handling machinery is frequently installed. It usually consistsof a receiving hopper, into which the coal is delivered, feeding STEAM POWER PLANTS. 149 to an endless chain of buckets which elevates and conveys thecoal to bunkers placed over the boilers; spouts lead from thebunkers to the floor near the furnace doors of the boilers if theyare hand fired or to mechanical stokers if the latter are the conveyor is arranged to pass beneath ash hoppersunder the boiler grates so that when not handling coal it can beused to elevate the ashes into a storage bin, from which they canbe removed by carts or otherwise. When coal is delivered byboat to a plant, particularly in large stations, it is frequently ele-vated by a self-filling bucket and raised by a boom to an elevatedcoal hopper in a tower on the wharf; the coal falls through a. ^-iSii^ 97£-^^-^ 97/^^4;-^8|4 Figure 61.—Cross-Section Power House Central Lard Co. crusher to reduce it in size and then passes through automaticweighing scales to the conveyors which deliver it into bunkersover the boilers. Sometimes large storage bunkers are built out-side of a power house, these being filled by conveyors, while asecond conveyor extends from the storage bunker to a smallerbunker over the boilers. Some idea of the varied manner inwhich coal handling machinery for power houses may be appliedcan be had by examining the illustrated catalogues of makers ofthis class of machinery. Cost of Coal Handling by Machinery.—For the purpose ofshowing the relative cost of hand firing and a modern coal-han- 150 STEAM POWER PLANTS. dling equipment combined with mechanical stokers in large plants,some pertinent figures have been obtained through the courtesyof a well-known electrical supply company owning a plant, con-taining a
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