In:
Journal of Fluids Engineering, ASME International, Vol. 67, No. 3 ( 1945-04-01), p. 197-205
Abstract:
While tremendous advances in feedwater treatment to protect boiler heating surfaces from scale, corrosion, and embrittlement have been made, the methods commonly used on railroads have been accompanied by an increasing degree of foaming troubles. According to statements of the American Railway Engineering Association, the introduction of alkaline sodium compounds, while reducing the scale problem, has increased the foam-producing capacity of the water supplies. This paper approaches a solution to the problem of carry-over by discussing the mechanisms which cause other than dry steam to leave the boiler. The most important type of carry-over is probably that due to foaming. Carry-over by effervescence is also discussed. The effects of carry-over and methods of prevention are treated in detail. In the study of the problem and its correction numerous tests have been conducted by the author’s company, and by the A.R.E.A., and individual railroads. These are reported at some length, the results showing that proper control of feedwater treatment will help minimize foaming. Antifoam compounds increase the concentrations that may be carried in the boiler, but concentration must be controlled either manually or by automatic blowing. Apparatus of various types for this purpose is described, as well as a suitable design of steam separator, which is essential to separate the carry-over from the steam, and discharge the carry-over to the atmosphere.
Type of Medium:
Online Resource
ISSN:
0097-6822
Language:
English
Publisher:
ASME International
Publication Date:
1945
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