Improvements in or connected with the Furnaces of Steam-boilers.
Year: 1894

page_text: Improvements in or connected with the Furnaces of Steam-boilers.
I, RICHARD HUGO DAMES. of 20, Admiralitätstrasse, Hamburg, in the Empire
of Germany, Engineer, do hereby declare the nature of this invention to be as
follows:-
The objects of this invention are to effect smokeless combustion in steam boiler
furnaces and to utilize the fuel to the greatest possible extent.
The arrangements hitherto employed for effecting the above mentioned objects,
have been based on the principle of introducing atmospheric air, either in a cold
or in a heated condition, under or close behind the grate, from the front of the
boiler. Many and serious drawbacks are involved in apparatus embodying this
principle, which greatly interfere with the stoking of the furnaces, especially in the
case of marine boilers, and are also very liable to become clogged or stopped up by
an excess of fuel and by ashes and clinkers.
According to my invention, heated air is introduced from the rear of the boiler
directly into the combustion-chamber.
The accompanying drawings illustrate my invention in connexion with a marine
boiler,
Fig. 1 being an elevation of the rear end of the boiler, and
Fig. 2 a longitudinal section of the boiler, parts being shown in elevation.
In the type of marine boiler generally used, wherein there is a combustion
chamber entirely surrounded by water, the supply of air is, according to this
invention, effected by means of a length of pipe a (Fig. 2) extending from the
combustion-chamber e to and through the rear wall of the boiler. In the case of
boilers with dry combustion chambers ("knapsack-boilers "), and in that ci
stationary boilers, the air may be introduced directly into the combustion-
chamber e.
In the upper part of the up-take or the lower part of the chimney, there is
arranged a system of piping 6, either in the form of serpentine coils, or after the
manner of a superheater, which communicates at one end with a ventilator c, and at
the other end by means of a pipe d with the combustion chamber e.
The ventilator c is a stoke-hold ventilator of the usual kind fitted with a rotary
cap which can be set in the direction of the wind. In cases where a ventilator of
this kind is not sufficient, a blower can be employed.
The air forced into the pipe & either by the natural draught or by the artificial
or forced draught produced by a blower, is heated in the said pipe by the escaping
smoke or gases of combustion, and flows through the pipe d'into the combustion-
chamber e at a point where the air comes into contact with the flame of the boiler
fire.
By this means the oxygen contained in the air is ignited and serves to burn the
carbon or small particles of coal carried along by the flame.
In this manner the fuel is utilized in the most favourable way conceivable, whilst
he formation of smoke is prevented.
Dated this 27th day of November 1894.

page_text: improvements in or connected with the Furnaces of Steam-boilers.
I, RICHARD HUGO DAMES, of 20, Admiralitätstrasse, Hamburg, in the Empire
of Germany, 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 :-
The objects of this invention are to effect smokeless combustion in steam-boiler
furnaces and to utilize the fuel to the greatest possible extent.
The arrangements hitherto employed for attaining these objects, have been based
on the principle of introducing atmospheric air, either in a cold or in a heated
condition, under or close behind the grate, from the front of the boiler. Many and
serious drawbacks are involved in apparatus embodying this principle, such apparatus
greatly interfering with the stoking of the furnaces, especially in the case of marine
boilers, and being itself very liable to become clogged or stopped up by an excess
of fuel and by ashes and clinkers.
According to my invention heated air is introduced from the rear of the
boiler directly into the rear combustion-chamber i.e. smoke-box of the boiler
furnace.
The drawings left with my Provisional Specification illustrate my invention
applied in connection with a marine boiler,
Fig. 1 being an elevation of the rear end of the boiler, and
Fig. 2 a longitudinal section of the boiler with parts in elevation.
In the type of marine boiler generally used, wherein there is at the rear of the
boiler furnace a combustion-chamber or smoke box entirely surrounded by water,
the supply of air is, according to this invention, effected by means of a pipe a
(Fig. 2) extending from the combustion chamber or smoke box e to and through
the rear wall of the boiler. In the case of boilers with dry combustion-chambers
("knapsack-boilers "), and in that of stationary boilers, the air may be introduced
directly into the combustion-chamber e.
In the upper part of the up-take or the lower part of the chimney, there is
arranged a system of piping b, either in the form of serpentine coils, or after the
manner of a superheater, which communicates at one end with a cowl or ventilator c,
and at the other end, by means of a pipe d, with the pipe a and combustion-
chamber e. The cowl or ventilator c is a stoke-hold ventilator of the usual kind,
fitted with a rotary cap which can be set to suit the direction of the wind. In cases
where a ventilator of this kind is not sufficient, a blower can be employed.
The air forced into the piping b, either by the natural draught, or by the artificial
or forced draught produced by a blower, is heated in the said pipe by the hot gases
and products of combustion escaping through the uptake and chimney and flows
through the pipe d and pipe a into the combustion-chamber e which it enters at a
point where it comes into contact with the flame from the boiler fire. By this
means, the oxygen contained in the said air serves to effect the combustion of the
carbon or small particles of coal carried along by the flame. In this way the fuel
fed to the boiler furnace is utilized in a very efficient manner and the formation of
smoke is prevented.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. Supplying heated air to the rear combustion-chamber or sunoke box of a steam
boiler furnace substantially as herein described for the nounce co fah

page_text: 2. In a steam boiler furnace the combination with the rear combustion chamber
or smoke box of the furnace, of apparatus constructed and arranged substantially
as described and shown for supplying heated air thereto for the purpose set forth.
Dated this 19th day of August 1895.
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.