. American engineer and railroad journal . steam in the tubeshas much to do with the success of the superheater. One ofthe best means to avoid the burning of the tubes is to ar-range them in a manner to obtain a very rapid circulation ofthe steam in the tubes, and a circulation relatively slow of thegases of combustion around the tubes. By these means thesteam has a cooling action on the tubes, the temperature ofwhich cannot much exceed that of the steam itself, while thegases of combustion are rapidly deprived of their great ex-cess of heat by the tubes which are nearest to the fire-box. An e
. American engineer and railroad journal . steam in the tubeshas much to do with the success of the superheater. One ofthe best means to avoid the burning of the tubes is to ar-range them in a manner to obtain a very rapid circulation ofthe steam in the tubes, and a circulation relatively slow of thegases of combustion around the tubes. By these means thesteam has a cooling action on the tubes, the temperature ofwhich cannot much exceed that of the steam itself, while thegases of combustion are rapidly deprived of their great ex-cess of heat by the tubes which are nearest to the fire-box. An example of this was found at the local exposition atNuremberg, where an ice machine of the Linde system, intend-ed to make ice for a skating rink, was driven by a steam en-gine, using highly superheated steam, constructed by Mr. & Co. at Aschersleben. This engine was at the same time to furnish power for aportion of the electric lighting of the exposition. This ser-vice required continuous running, and this plant did not shut. Fig. 1.—Generator and Superheater. face of each boiler is only 7 square meters, the grate meters, being for the two boilers together 14 square me-ters and square meters respectively. It is to be seen thatthe heating surface is small in comparison to the grate sur-face, from which there is a yery great production of steam
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
