Year: 1890

page_text: The rear wall of the furnace is also provided with a series of loops or supports, E,
to receive the movable grate or teeth, F, said grate or bars being made of
suitable refractory material, such as fire clay or plumbago, and the object of which
is to prevent the fuel from falling forward into the throat of the furnace when the
damper is raised.
At the bottom and at the rear of the furnace is provided a gutter, G, which
communicates with the outer air through the door, H, and through which the ashes
are received, as for instance when the fuel is to be let down to the point of
combustion, the attendant simply pushes the ashes back from the bottom, into the
gutter, G, and the incandescent fuel together with the green fuel will be lowered
to the point of combustion, and the ashes withdrawn from the gutter through
the door.
I, is the throat leading from the furnace to the water chambers where the steam
is generated. The generator is composed of the hollow base, K, of any suitable
size and dimensions which communicates with the hollow columns or chambers, L.
The columns or chambers, L, are connected together by horizontal chambers, M,
and between the hollow columns or chambers, L., are arranged a series of thin or
narrow water chambers, N, the lower ends of which communicate with the base, K,
while the upper ends of said chambers extend upward nearly to the horizontal
chamber, M. There may be any desired number of these water chambers, N,
arranged in a line parallel with the exit line of the products of combustion, and in
the construction of these steam generating chambers I use a bar, 0, bent as
indicated in Figure 10, which rests in the shoes, P', said shoes being firmly riveted
to the upper walls of the chamber, K.
The shoes, P, which are necessary to make this construction of boiler a practical
one, are for the purpose of making a strong steam tight connection between the
several chambers of the boiler, and especially at the corners where a proper joining
of the walls of the chambers cannot be accomplished by other forms of construction,
and hence the shoe, P, forms an indispensable feature of the boiler.
The metal plates which connect the outer walls of the generating chambers, N,
are riveted to the bars, 0, so as to form a complete structure, as shown in
Figure 4.
R, is the steam dome or super-heater, which is supported in any suitable manner
above the water chamber, M, and between the walls of the water chambers, L, the
upper portion of the water chambers, L, being connected so as to communicate with
the steam drum, R, by means of the pipe, S. The steam drum or super-heater, K,
is provided with the pipe, T, which conveys the steam to any suitable point
of use. The upper-portion-of-the generating chambers,-M, and N, are connected to
and communicate with the upper portion of the chambers, L. by means of the
pipes, U, which are primarily designed to permit the air to escape from the upper
portion of said chambers when the same are being filled with water, and which will
allow the said chambers to be always full, and in the generation of steam a certain
portion of the steam will be conducted through the pipes, U, to the upper portion
of the chambers, L, where it enters the super-heater or chamber, R, but the greater
portion of the steam generated in the chambers, N, passes down and enters the
chambers, L, through its connection at the base.
Certain portions of the waste products of combustion pass off from around the
chambers, N, and surround the super-heater-or-drum,-R, which,-together_with_the
heat radiated from the chambers, L, and N, surround and super-heat the steam in
the chamber, R, and thus make the furnace very effective. The wast products pass
up around the chambers, R, and pass out to the stack, W, through pipe, A', while
the products of combustion which pass between the chambers, N, are conducted to
the stack, W, through the pipe, B¹.
The walls of the generating chamber, that is the masonry work, are provided with
a flue which enters the generating chamber at each side and communicates with the
pipes, A, B, leading to the stack, W.
The object of this construction is to carry the waste products of combustion in a