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Why single drum boiler has been preferred why not bi-drum in steam boilers?
Ragupta1977
It is difficult to say what is better or preferred in absolute terms. There are pros and cons in not only number of drums in a boiler but in almost every techn solution. Single drum boiler shall be cheaper to manufacture as far as the boiling tubes (beyond the furnace walls) and connecting tubes from upper and lower headers do not become an expensive headache. I have recently seen some manufacturers claiming single drum to be the state of the art which is not true since single drum boilers have been in the market since the beginnings of the times we can say. Check old straight tubes sinuous header B&W boilers in any old book.
Pros:
Drum is situated out from flue gas --not heated--
Less holes in drum allow thinner walls and individual holes can be reinforced
Erection time would normally be shorter --more shop assemble parts--
Cons:
Water quality! Tubes scaling eliminatiio in case of accidentally using poor quality water --as it happens in some indutries with low of med pressure boilers-- is more difficult to clean than in two drums boilers.
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∙ 11y ago
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