Steam power plants, their design and construction . reduce the draft slightly owing to the friction of thegases passing through them and to the reduction in temperatureof the gases. Provision should be made for this by the use ofmechanical draft or of larger chimneys than would be necessaryif economizers are not used. In plants already constructed theaddition of economizers reduces the coal consumption, and thiscounterbalances in a measure the loss in draft, as less draft isnecessary with them because less fuel is burned. Economizers consist of vertical cast-iron pipes about 4 inchesin diamete
Steam power plants, their design and construction . reduce the draft slightly owing to the friction of thegases passing through them and to the reduction in temperatureof the gases. Provision should be made for this by the use ofmechanical draft or of larger chimneys than would be necessaryif economizers are not used. In plants already constructed theaddition of economizers reduces the coal consumption, and thiscounterbalances in a measure the loss in draft, as less draft isnecessary with them because less fuel is burned. Economizers consist of vertical cast-iron pipes about 4 inchesin diameter and 9 feet long placed in rows several inches apart,each row being connected at the top and bottom to cast-iron head- 116 STEAM POWER PLANTS. ers through which the water is suppHed and withdrawn. Theyare provided with scrapers that encircle the pipes and that arecontinuously raised and lowered by a suitable mechanism, thepower coming usually from a small steam engine. Economizersare placed in brick flues between the boilers and the chimney, and. J-BeamUnM.\ .\\^>js\\\\\\\\t;^
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