Improvements in Internal Furnaces and Flues of Steam Boilers.
Year: 1893

page_text: Date of Application, 17th Aug., 1893
Complete Specification Left, 16th May, 1894-Accepted, 23rd June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Internal Furnaces and Flues of Steam Boilers.
I, JOHN MCKAY,- of 19, Victoria Avenue, Whitley, in the County of
Northumberland, Engineer, do hereby declare the nature of this invention to be
as follows:
The object of this invention is to provide for the better circulation of water on
the crown of cylindrical furnaces and flues of steam boilers than exists at the
present time.
I have found, by observation, that the flow of water to the crown of a steam.
boiler furnace at work is much retarded by the stream of steam globules rising.
from the surface of the furnace at each side of the ridge, and, that overheating and
collapse occasionally occurs in consequence.
To remedy that evil, I prepare the furnace plate by sinking panels in its surface,
preferably on the side next the fire, leaving a margin or framework of thicker
plate around each panel, and in network connection with each other, which being.
thicker and therefore slower conductors of heat than the panels; allow corre-
sponding canals to form against them on the water side of the plate and act as
feeders to the active evaporative areas of the panels.
Although I prefer forming the water side of the furnace or flue plain throughout,.
I may sink the panels on that or both sides of the plate; and they may be sunk by
rolling, or by direct pressure before or after the plate is bent..
Dated this Sixteenth day of August 1893.
COMPLETE SPECIFICATION.
Improvements in Internal Furnaces and Flues of Steam Boilers.
I, JOHN MCKAY, 19, Victoria Avenue, Whitley, Northumberland, Engineer,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:—
I have found by observation that the streams of steam globules, which rise from
each side of the ridge of a steam boiler furnace when at work, adhere tenaciously
to their original points of issue, and so form a hindrance, which seriously retards
the necessary flow of water to the crown or ridge of the furnace, and that.
overheating and collapse occasionally occurs in consequence.
My invention remedies this evil by determining the circulation of the water, on
the crown of cylindrical furnaces and flues of steam boilers, and insures a free flow
of water to the saddle plate and tube ends thereby preserving them from
overheating especially in marine and other boilers with overhead return tubes.
The manner in which my said invention attains this object, is in preparing the
furnace and flue plates, by sinking a series of panels in their substance, in either or
both sides of said furnace and flue plates.
Thus the panels being thinner in section than the surrounding portions of the
plate, they become the most active evaporative areas, while the thick portions,
being, on account of their thickness, relatively slower conductors of heat, allow
canals of comparatively cooler water, to form & flow against them, which canals
act as feeders to the more active panels.