Certain Improvements in or connected with Regenerative Furnaces.
Year: 1896

page_text: Date of Application, 27th Nov., 1896
Complete Specification Left, 26th Aug., 1897-Accepted, 2nd Oct., 1897
PROVISIONAL SPECIFICATION.
Certain Improvements in or connected with Regenerative Furnaces.
I, JOHN WILLIAM HALL, of Ivy House, Bilston, in the County of Stafford,
Engineer, do hereby declare the nature of this Invention to be as follows:-
This Invention has reference to gas furnaces having reversing regenerators
usually known as "Siemens Furnaces." According to this Invention I provide
in addition to the usual four ordinary regenerators, two additional regenerators
which are so connected by means of valves that the whole of the products of
combustion after leaving the usual pair of regenerators on the exhaust side of
the furnace are passed through one of the additional regenerators which absorbs
any useful heat remaining in the waste products. On reversing the furnace the
gas passes to the ordinary gas regenerator as in the common arrangement of
reversing regenerator furnaces but the air passes through the supplementary
regenerator which has been previously heated by the waste gases and from that
to the usual air regenerator.
The above described method of working may be carried out without the pro-
vision of any extra valves, beyond the valves frequently now employed known as
'pot-lid" valves for the gas, and the common air reversing valves, provided the
latter be of a size sufficient to pass the whole of the products of combustion.
Dated this 26th day of November 1896.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
Certain Improvements in or connected with Regenerative Furnaces.
I, JOHN WILLIAM HALL, of Ivy House, Bilston, in the County of Stafford,
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:---
This Invention has reference to gas furnaces having reversing regenerators
usually known as "Siemens furnaces." According to this Invention I provide
in addition to the usual four ordinary regenerators, two addition regenerators
which are so connected by means of valves that the whole of the products of
combustion after leaving the usual pair of regenerators on the exhaust side of the
furnace are passed through one of the additional regenerators which absorbs any
useful heat remaining in the waste products. On reversing the furnace the gas
passes to the ordinary gas regenerator as in the common arrangement of reversing
regenerator furnaces but the air passes through the supplementary regenerator

page_text: which has been previously heated by the waste gases and from that to the usual
air regenerator.
The above described method of working may be carried out without the pro-
vision of any extra valves, beyond the valves frequently now employed known
as "pot-lid valves for the gas, and the common air reversing valves, provided
the latter be of a size sufficient to pass the whole of the products of combustion.
My Invention is illustrated by the accompanying drawing on which Fig. 1 is
a sectional elevation on line X X of Fig. 2 of a regenerator furnace with my
Invention applied; Fig. 2 is a sectional plan of the same on line Y Y of Fig. 1;
and Fig. 3 is a sectional elevation on line Z Z of Fig. 1.
The same letters of reference indicate the same parts in all the Figures.
A' A are the two ordinary air regenerators: 13 13 are the two gas regenerators
above which is the ordinary furnace C; D 1 are the two additional regenerators
of which D receives the waste products of combustion from the air and gas
regenerators A' B' and, when the furnace is reversed, D is the regenerator which
receives the waste products of combustion from the ordinary regenerators A³ ³.
E is the usual gas flue from which the gas is taken by the ordinary gas hox e¹
through the regulator valve F from which it is distributed to the two ordinary
not-lid valves G G through which the gas passes to one or other of the gas
regenerators B B. The air enters either one or other of the extra regenera-
tors D D through the butterfly reversing valve H and from that extra regenerator
the air passes to the ordinary regenerator and so on to the furnace.
The operation of the furnace is as follows:-Assuming that the air is entering
the furnace C through the air regenerator A2 and the gas is entering the furnace
through the gas regenerator 13 the valve G will be on its lower seating as shewn
so that the gas will enter the furnace C from the gas flue E along the horizontal
gas box e and over the valve G2 and along the outlet of the gas box and
through the ordinary gas regenerator B. The air meanwhile enters the extra
regenerator D by the butterfly reversing valve II and passes through the same
and through the passage d and up through the ordinary air regenerator A to
the furnace C. The waste products of combustion will pass from the furnace C
down through the ordinary air regenerator A and gas regenerator B and as
the valve G is in contact with its upper seat as shewn the passage e³ will be con-
neeted through the side box and valve hox with the extra regenerator D' so that
the waste products of combustion will pass from the ordinary regenerator B
through the passage and up and under the pot-lid reversing valve (it and down
and through the extra regenerator D where it meets the other portion of the
waste products of combustion which enter the extra regenerator D through the
ordinary regenerator A' and thus all the products of combustion pass through
the extra regenerator 1) and on through the butterfly reversing valve H and
along the chimney flue I fo the stark J. The diretion of the air and gases above
described is indicated by the arrows on the drawing.
Thus the extra regenerator D is heated by the waste products of combustion
from the ordinary regenerators A B which otherwise would have passed direct
to the chimney. The heat stored in the additional regenerator D is used up
in heating the incoming air passing therethrough when the furnace is reversed,
the waste products of combustion then passing in a similar manner from the
regenerators A2 132 through the extra regenerator D2 and in the same manner
heating this regenerator ready for heating the incoming air when the furnace is
again reversed.
The horizontal positions of the extra regenerators D D as shown upon my
drawing is preferable as being most generally convenient but it will be under-
stood that my Invention is not limited to this arrangement as there is nothing
to prevent the extra regenerators being arranged in other ways as may be necessary
to adapt the Invention to the particular position which the furnace occupies. It
will thus he seen that any leakage of gas through the gas valves, which under
ordinary circumstances would burn in the waste flue or chimney, is caught and

page_text: burnt as it passes through the additional regenerators D or D2 and the heat so
generated is thus utilized instead of passing wastefully up the chimney. It will
be observed that no different valves are required than are requisite for the ordinary
Siemen's reversing furnaces provided only that the air valve H should be of
sufficient area to pass the whole products of combustion instead of passing only
those from the air regenerator as would be the case if the extra regenerators were
not used.
It will be understood that the arrangement of pot-lid valves G¹ G³ shewn is
not the only one that can be adopted to carry out my Invention. Any type of
reversing gas valve which allows the waste products of combustion to pass to
separate exhaust branches, instead of into one exhaust branch as is the case with
the ordinary butterfly reversing valve, will serve for working the furnace.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The employment with each pair of ordinary regenerators in a regenerative
furnace, of two additional regenerators so arranged and connected by means of
valves that the products of combustion after leaving the usual pair of regenerators
on the exhaust side of the furnace pass through and heat one of the additional
regenerators through which when the furnace is reversed the air passes and is
heated on its way to the pair of ordinary regenerators substantially as described.
2. The employment with each pair of ordinary regenerators in a regenerative
furnace of the two additional regenerators D 12 and the valves and connections
arranged substantially as hereinhefore described and illustrated by the accom-
panying drawing so that the products of combustion after leaving the usual pair
of regenerators on the exhaust side of the furnace pass through and heat one of
the additional regenerators I) or 13 through which when the furnace is reversed
the air passes and is heated on its way to the pair of ordinary regenerators as
hereinbefore set forth.
Dated this 25th day of August 1807
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.