Steam Superheaters (Classic Reprint) 9781333883645

Варианты приобретения

Цена: 8800.00T
Кол-во:
о цене
Наличие: Невозможна поставка.

в Мои желания

Автор: Company Babcock and Wilcox
Название: Steam Superheaters (Classic Reprint)
ISBN: 9781333883645
Издательство: Forgotten Books
Классификация: ISBN-10: 1333883641
Обложка/Формат: Paperback
Страницы: 84
Вес: 0.12 кг.
Дата издания: 13.01.2019
Язык: English
Размер: 22.86 x 15.24 x 0.43 cm
Поставляется из: США
Описание: Excerpt from Steam Superheaters

Southern california edison co., long beach, cal. Babcock wilcox superheaters installed II 0200 horse power OF stirling boilersthat obtained simply by the use Of superheated low pressure steam. With the increase in the pressure there was an increase in the temperature and where attempts were made to superheat the high pressure steam to the same degree as had been the practice with the low pressure steam, great difficulty was experienced in lubrication, the present mineral cylinder oils being then unknown, and in some cases the designs being unsuitable for superheated steam. Where superheaters were used it was found necessary to reduce the amount of superheat to a point where its gain was too small to warrant the expense of a superheater installation. The almost universal use of compound engines in marine practice thus made the adoption Of superheaters impracticable. Although superheaters had never been as extensively used in stationary work, they were abandoned on land at the same time as at sea. Dr. Kirk introduced the triple expansion engine in 1874 and by 188 I it had become the normal type of marine engine, and the still further increase in steam pressure for this type of engine was an additional factor militating against the use of superheaters.

It is interesting to note that the British Board of Trade took a strong stand against the use of superheated steam on the ground that there was danger of the steam being broken into its constituent elements at high temperatures, and becoming dangerous. This stand, while wholly in error, had an effect in retarding development.

The use of mineral oils became general in the early seventies (though our present day heavy cylinder oils were unknown) and its use might have furnished the solution of the lubrication difficulties arising from the use of superheated steam had it not been for the fact that the foremost engineers were devoting their whole attention to the increase in efficiency of engines from the use of higher pressures, compounding, and improvements in mechanical details of valve gears, governors, and the like. Superheated steam through this period seems to have been almost entirely forgotten or discarded because of bad reports. A. E. Seaton, in A Manual of Marine Engineering says: The use of superheated steam has been discontinued since the pressure has gone beyond 60 pounds per square inch, partly in consequence of the increase in temperature beyond that due to the pressure being prejudicial to the good working of certain parts, partly also due to the danger and inconvenience of the superheater itself, and not a little to the action taken by the Board of Trade (british) with respect to it. This statement was made in editions of Seatons manual as late as 1890.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Steam Superheaters (Classic Reprint), Company Babcock and Wilcox