IMPROVEMENTS IN THE HEATING OF STEAM BOILERS
Year: 1876

page_text: LETTERS PATENT to John Cowan, of the Vineyard, Garston, near Liverpool,
for the Invention of "IMPROVEMENTS IN THE HEATING OF STEAM BOILERS."
PROVISIONAL SPECIFICATION left by the said John Cowan at the Office of
the Commissioners of Patents on the 3rd March 1876.
JOHN COWAN, of the Vineyard, Garston, near Liverpool.
THE HEATING OF STEAM BOILERS."
"IMPROVEMENTS IN
This Invention has for its object to generate.-steam by means of the waste heat
from lime kilns. In order to accomplish this object I use a vertical or horizontal
steam boiler, as may be convenient, which I place over the top of the kiln which is
used for calcining lime. I so place the boiler that the kiln can be charged by a
door which is placed for the purpose, and I close in the remainder of the mouth of
the kiln with bricks or other material, so as to conduct the product of combustion
in flues round the boiler and through the tubes (when the boiler contains tubes)
before it passes up the chimney.
I also in some cases construct a boiler which forms part or whole of the kiln,
inside of which the lime is calcined.
When the boiler does not form any part of the kiln I place a second boiler of
suitable form around the kiln, for the purpose of heating the water for supplying
the steam boiler. By this means a constant supply of boiling water is obtained for
the steam boiler.
In order that the calcining of the lime may be carried on when steam is not
required I construct a flue which carries off the products of combustion into the
chimney without passing through the flues which surround the boiler or through
the tubes of the boiler. This flue is opened or closed by means of a damper placed
there for the purpose.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Cowan in the Great Soal Patent Office on the 2nd September
1876.
JOHN COWAN, of the Vineyard, Garston, near Liverpool. "IMPROVEMENTS IN THE
HEATING OF STEAM BOILERS."
This Invention has for its object to generate steam by means of the waste heat
from lime kilns. In order to accomplish this object I use a vertical or horizontal
steam boiler, as may be convenient, which I place over the top of the kiln which is
used for calcining lime. I so place the boiler that the kiln can be charged by a
door which is placed for the purpose, and I close in the remainder of the mouth of
the kiln with bricks or other material, so as to conduct the products of combustion
in flues round the boiler and through the tubes (when the boiler contains tubes)
before it passes up the chimney.
I also in some cases construct a boiler which forms part or whole of the kiln
inside of which the lime is calcined.
When the boiler does not form any part of the kiln I place a second boiler of
suitable form around the kiln for the purpose of heating the water for supplying
the steam boiler. By this means a constant supply of boiling water is obtained for
the steam boiler.
In order that the calcining of the lime may be carried on when steam is not
required I construct a flue which carries off the products of combustion into the
chimney without passing through the flues which surround the boiler or through
the tubes of the boiler. This flue is opened or closed by means of a damper placed
thero for the purpose.
In order that my said Invention may be most fully understood and readily carried:
into effect, I will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a ground plan of apparatus arranged according to my Invention;
Figure 2 is an elevation of the upper parts of the same; Figure 3 is a side view;
and Figures 4 and 5 are vertical sections taken on the lines 1, 1, and 2, 2, Figure 1.
A, chamber of a lime kiln; B is the containing wall of the chamber; C, hot air
chamber or backing of sand; C¹, cold air inlets; D, retaining walls and filling in;
E is an arched recess giving access to the drawing and lighting hole F; G, the
opening for feeding the lime kiln, it can be closed by sliding iron doors; H is a
boiler for generating steam, which may be made of iron, copper, or any other metal,
and of any form of which steam boilers are usually made; I, smoke chamber and
flue; J, steam main; K, safety valve; L, pressure gauge; M, water gauge; N, trial
cocks; O, ring boiler for supplying hot water to steam boiler; P, flow and return
pipes from cistern; Q, cistern for supplying the ring boiler and holding a supply of
heated water for the steam boiler.
What I claim is the combination of boilers with kilns for calcining lime, sub-
stantially in the manner described.
In witness whereof, I, the said John Cowan, have hereunto set my hand and
seal, this Twenty-eighth day of August, in the year of our Lord One thousand