Improvements in Steam Generators.
Year: 1898

page_text: Date of Application, 30th Mar., 1898-Accepted, 6th Aug., 1898
COMPLETE SPECIFICATION.
Improvements in Steam Generators.
We, HENRY BURNETT WATSON, JOHN STANLEY WATSON, and TORBEN CHRISTIAN
BILLETOP, of High Bridge Works, City and County of Newcastle-on-Tyne,
Engineers, 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:-
This invention has reference to steam generators of the combined fire and water-
tube type, and has for its object to make such steam generators more efficient and
compact than those hitherto constructed.
Our said invention and the manner of carrying the same into effect may be best
understood by aid of the accompanying drawings, in which the same reference
letters are used to indicate corresponding parts in all the figures shown.
Fig. 1 is a sectional elevation;
Fig. 2 a half plan of the top of the boiler as regards its upper part; and half
plan of the upper tube plate as regards its lower portion.
Fig. 3 is a half plan of the lower tube plate in its upper portion, and a half
plan of the fire-grate and lower chamber in the lower half.
Fig. 4 is a sectional elevation of the grate and back bridge, on the lines A-B
of Figure 3.
In these, A is an external shell or cylinder of the main boiler, B B are a series
of fire tubes passing through the main boiler, C spherical bottom of the main
boiler and D upper tube plate also forming part of the walls of the main boiler.
E a further portion of the shell of the boiler which is supported by struts e from
the spherical top of the main boiler and is arranged in such manner that the tubes D
can be easily got at for cleaning and renewal. G is a central tube of large diameter
connecting chamber F with the main boiler. H H a series of smaller water tubes
surrounding tube G and further connecting the chamber F with the main boiler.
Chamber F is otherwise left free to expand being attached to the boiler only by
tubes G and H. II are the fire grates nearly surrounding chamber F. They are
stoked through one or more fire doors J. K is a brick arch fitted with holes
space below
extending up through the same at an angle so as to deliver air from the
on to the top of the fire. This bridge K is arranged on the opposite side to that
of the furnace doors, or on the portion of the grate which it would be difficult to
stoke as lying behind the sediment chamber and water tubes. The outer wall of
the furnace is formed of fire bricks N bolted to a light casing O. P are feet or
brackets carrying the boiler, Q is a manhole shown in Figure 2 at the top of the
boiler for cleaning purposes and R & S are hand or mud holes for cleaning out
mud and deposits. T is the fire-box or combustion chamber. U uptake or smoke
casing. V funnel or exit to chimney, and W feed pipe. This feed pipe is bent
down as shown so as to deliver the feed into the large tube G and thus assist the
circulation.
The mode of action is as follows:-The products of combustion from the grate I
are obliged to pass among the water tubes H before they can enter the fire tubes B.
Passing through the fire tubes B they give out their heat and escape into the

page_text: uptake U which is provided with shield plates U so as to prevent too great radiation
of heat at that point. The water circulating down tube G passes up through the
water tubes H and entering the main casing is obliged to pass among the fire
tubes P before it can enter the main part of the boiler or descend again through
the tube G. The admission of air below the bridge can be regulated by regulating
the supply through the air holes L by means of a shutter or door operated by a
handle from the front of the ashpit in the usual manner, and the opening of the
furnace doors J. The feed water being naturally colder than the water in the
boiler assists the circulation by causing a down current through tube G.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
-
1. The arrangement in steam generators of the combined fire and water tube
type of the fire and water tubes in such manner relative to each other that the pro-
ducts of combustion are obliged to pass among the water tubes before entering
the fire tubes while the heated water and steam formed in the water tubes have to
cross among the fire tubes in the course of their circulation substantially as
described and illustrated.
2. The combination of the up and down comers G & H with the lower sediment
chamber arranged free for expansion substantially as herein described.
3. The general arrangement of combined fire and water tube boiler substantially
as described and illustrated in the accompanying drawings whereby the staying
of the tube plates is greatly reduced beyond what is usually required and the
various parts are practically balanced or self supporting.
4. In combination with a combined fire and water tube boiler such as described
under the above claims the special arrangement. for supplying air above the
furnace substantially as herein described.
Total : 0
1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicants.