Improvements in Steam Generators.
Year: 1895

page_text: Date of Application, 12th Dec., 1895
Complete Specification Left, 27th Aug., 1896-Accepted, 10th Oct., 1896
PROVISIONAL SPECIFICATION.
'Improvements in Steam Generators..
I, GEORGE CROYDON MARKS, of 18 Southampton Buildings, Chancery Lane,
London, W.C. Consulting Engineer (a communication from Antonin Montupet,
of 42 Boulevard Bonne-Nouvelle, Paris, in the Republic of France), do hereby
declare the nature of this invention to be as follows:-
My invention relates to multitubular steam generators and comprises. a new
combination of arrangements which have been described in the Specification of my
correspondent's prior Letters Patent No. 18270 dated the 30/9/95.
According to my present invention I use arrangements whereby the combination
of return flues to accomplish a better utilization of fuel is, realized in practice.
The steam generating tubes support partitions or baffle plates which compel.the
products of combustion to come in intimate contact with such tubes throughout
their length, and when these products leave the extremity of the said tubes between
the partitions or baffle plates they will pass into other tubes placed in the upper
longitudinal chamber and therefrom pass into the chimney. On leaving the steam
generating tubes the products of combustion are still at a very high temperature
and when passing through the return flue tubes they will yield their heat to the
water in the chamber which they convert into steam.
-Moreover the products of combustion on meeting in the upper chamber prior to
entry into the return flues in the chamber' become intimately mixed and are again
ignited so that I obtain an important saving of fuel while augmenting the power of
the generator.
The chamber being heated as well as the return flue tubes fitted therein, expands,
equally with such tubes and liability to escape is avoided.
The steam generating tubes may be heated as energetically as desired, say to
heat corresponding to 150 to 200 kilogrammes and upwards of coal per aquare
metre of grate surface, as they are adapted to expand freely and they protect
the chamber and the inner tubes fitted therein from the action of too great a
heat.
When the steam generator is constructed with short tubes I may also establish a
return flue with the upper longitudinal chamber.
Dated this 12th day of December 1895.
MARKS & CLERK,
18. Southampton Buildings. London. W.C.. Agents.
COMPLETE SPECIFICATION.
Improvements in Steam Generators.
I, GEORGE CROYDON MARKS, of 18 Southampton Buildings, Chancery Lane,
London, W.C. Consulting Engineer, (a communication from Antonin Montupet,
of 42 Boulevard Bonne-Nouvelle, Paris, in the Republic of France), 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 :-
My invention relates to multitubular steam generators and comprises a new

page_text: combination of arrangements which have been described in the Specification of my
correspondent's prior Letters Patent No. 18270 dated the 30/9/95.
According to my present invention I use arrangements whereby the combination
of return flues to accomplish a better utilization of fuel is realized in practice.
Figure 1 represents a steam generator having a longitudinal chamber with return
flue tubes, and long vapourising tubes, while
•
baffle
Figure 2 is a modified construction sometimes adopted.
The steam generating tubes F are supported by partitions or
plates R, S, U, which compel the products of combustion to come into intimate
contact with such tubes throughout their length, and when these products leave
the extremity of the said tubes F between the partitions or baffle plates S and U
they will pass into the other tubest placed in the upper longitudinal chamber A
and therefrom pass into the chimney V. On leaving the steam generating tubes F
the products of combustion are still at a very high temperature, and when passing
through the return flue tubes t they will yield their heat to the water in the
chamber A which they convert into steam.
Moreover the products of combustion prior to entry into the return flues in the
chamber become intimately mixed and are again ignited so that an important saving
of fuel is obtained while the power of the generator is augmented.
The chamber A being heated as well as the return Hue tubes fitted therein,
expands equally with such tubes, aud liability to escape is avoided.
The steam generating tubes F may be heated as energetically as desired, say to
heat corresponding to 150 to 200 kilogrammes and upwards of coal per square
metre of grate surface as they are adapted to expand freely in the supporting
plates R and U and they protect the chamber A and the inner tubes fitted therein
from the action of too great a heat.
I may also provide return flue tubes t within the upper longitudinal chamber A
when the generator is arranged with short tubes F, as shown in Figure 2..
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
-
In a multitubular steam generator having an upper longitudinal chamber the
combination of lower vaporizing tubes adapted for free expansion, with return flue
tubes arranged in the said chamber and adapted for equal expansion therewith,
substantially as and for the purposes herein before set forth.
Dated the
TAÑA
KAND
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.