Improvements in or connected with Steam Generators.
Year: 1895

page_text: Date of Application, 31st July, 1895
Complete Specification Left, 22nd Jan., 1896-Accepted, 22nd Feb., 1896
PROVISIONAL SPECIFICATION.
Improvements in or connected with Steam Generators.
I WILLIAM EAVES of Atlas Steel and Iron Works Sheffield in the County
of York Engineer do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to so arrange or construct boilers for either natural,
induced, or forced draught that whilst economy in construction and space occupied
is secured the hot gases from the furnace are very efficiently utilized in effecting
the preliminary heating of the incoming air and also increasing the heating effect
on the boiler itself and at the same time the boiler can be kept at practically the
same temperature throughout so as to prevent unequal expansion and contraction
thus minimizing injurious strains. According to my invention I surround the
boiler, or part thereof, with two casings forming two spaces wholly or partly
around the boiler. The outer of these spaces is provided with an air inlet or air
inlets in any suitable position and either open to the air for natural or induced
draught or provided with air forcing devices for forced draught. The said outer
space also communicates with the mouth of the furnace by means of suitable
valves for controlling the admission of air to the furnace either above or below the
furnace bars or both. The inner space is in communication on the one hand with
the furnace or the tubes leading therefrom and on the other hand with the chimney
or outlet for the products of combustion from the furnace or with the fan if an
induced draught be used. The air enters the outer space and passes therethrough
to the furnace and the products from the furnace passing through the inner space
heat the air so entering through the outer space and at the same time exert a very
efficient heating effect on the boiler itself.
Suitable openings with doors can be made through the casings to allow of
cleaning as required.
Dated this 21st dor of Lule 1805
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in or connected with Steam Generators.
I, WILLIAM EAVES, of Atlas Steel and Iron Works, Sheffield, in the County
of York, 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 object of my invention is to so arrange, or construct, boilers for either
natural, induced, or forced draught, that, whilst economy, in construction and
space occupied, is secured, the hot gases from the furnace or furnaces, are very
efficiently utilised in effecting the preliminary heating of the incoming air and
also increasing the heating effect on the boiler itself, and, at the same time, the
boiler can be kept at practically the same temperature throughout so as to prevent
unequal expansion and contraction thus minimising injurious strains. According

page_text: to my invention I surround the boiler, or part thereof, with two casings forming
two spaces wholly or partly, around the boiler. In the accompanying drawing
I have shewn in Figure 1 in end view and in Figure 2 in longitudinal section
a boiler provided with casings according to my invention the inner casing being
marked B and the outer casing being marked A. The outer of these spaces
(marked' A) is provided with an air inlet or air inlets at a in any suitable position
and either open to the air for natural or induced draught, or provided with air forcing
devices for forced draught. The said outer space A2 also communicates with the
mouth of the furnace by means of suitable valves for controlling the admission of
air to the furnace or furnaces either above or below the furnace bars or both.
The inner, space B2 is in communication on the one hand through the space D²
(enclosed by the casing D) with the furnace or furnaces, or the tubes leading
therefrom as shewn and on the other hand at with the chimney or outlet for the
products of combustion from the furnace or with the fan if an induced draught be
used. The air enters the outer space A³ and passes therethrough, and through
the space C2(enclosed by the casing C) to the furnace or furnaces through those of
the valves which are open in the casing surrounding the furnace and ash pit front,
and the hot gases from the furnace pass through the inner space B2 and heat the air
so entering through the outer space and at the same time exert a very efficient
heating effect on the boiler itself.
Suitable openings with doors can be made through the casings to allow of cleaning
as required. The air may enter the space A directly or there may be a casing at
the rear end of the boiler as shewn at a into which the air first enters on its way
to the space A².
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed declare that what I
claim is
1. In combination with a steam boiler, a passage, or passages, for the hot gases
from the furnace or furnaces and a passage, or passages, for the air to the furnace, or
furnaces, the said passages, both for the said hot gases and for the said air,
surrounding, or partly surrounding, the body of the boiler; substantially as, and
for the purposes, hereinbefore described.
2. In combination with a steam boiler, two casings enclosing spaces surrounding
or partly surrounding the body of the boiler the one space being in communication
with the furnace, or furnaces and with the chimney, or outlet, and the other space
being in communication with the air inlet and with the furnace or furnaces;
substantially as herein before described and illustrated in the accompanying
-drawings.
Dated this 22nd day of January 1896.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.