Improvements in Superheaters to be used in connection with Gas Producing Apparatus.
Year: 1899

page_text: Date of Application, 14th Sept., 1899.
Complete Specification Left, 28th May, 1900-Accepted, 7th July, 1900
PROVISIONAL SPECIFICATION.
Improvements in Superheaters to be used in connection with Gas
Producing Apparatus.
We, EDWARD JAMES DUFF, Engineer, and The UNITED ALKALI COMPANY,
LIMITED, both of 30, James Street, Liverpool, in the County of Lancaster, do
hereby declare the nature of this invention to be as follows:-.
This invention relates to apparatus employed for superheating the mixture
of air and water vapour for use in the manufacture of gas from gas producers.
The superheating of the air and water vapour is effected by abstracting a
portion of the heat from the producer gases as they pass to the ammonia recovery
plant and thence to the furnaces. The abstraction of the heat is usually effected
by causing the hot producer gas and the cold mixture of air and water vapour to
travel through concentric pipes an arrangement which, owing to the different
contractions and expansions, leads to destruction of the apparatus.
According to this invention the pipes (preferably four) conveying the hot pro-
ducer gases, are encased in a rectangular iron chamber furnished with baffle
plates through which the air to be superheated is caused to flow and combined
with the said pipes are boxes to catch the dust which accompanies producer
gases. The said pipes are connected alternately at top and bottom by connecting
boxes which are built outside the said rectangular chamber, so as practically to
form one long zig-zag pipe. The gases from the producer enter the first pipe
near the bottom and at one end of the superheating chamber and, after passing
upwards and downwards several times, according to the number of pipes used,
the said gases leave at the other end of the chamber. The air and steam enter
the superheating chamber near the top and at the side at which the producer
gases are leaving, and are caused by the baffle plates projecting alternately from
the top and bottom of the rectangular chamber, to travel outside the pipes con-
veying the producer gases and in a direction opposite to that taken by the said
gases and leave through an exit pipe near the bottom at the far end of the super-
heating chamber that is the end nearest to the gas producing chamber.
The aforesaid dust boxes are, in the case of the entering and exit pipes con-
veying the producer gases prolongations of these pipes below the bottom of the
superheating chamber and furnished at their lower ends with doors through
which the dust can be removed. In the case of the intermediate pipes the dust
box is in the form of a hopper also furnished with a door below. This hopper,
in addition to acting as a dust catcher, forms the bottom connecting box between
the gas pipes; and is sufficiently large to cause a diminution in the gas current
at this point and thus aid the settlement of dust.
Dated this 14th day of September 1899.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.

page_text: Improvements in Superheaters to be used in connection with Gas
Producing Apparatus.
We, EDWARD JAMES DUFF, Engineer, and The UNITED ALKALI COMPANY,
LIMITED, both of 30, James Street, Liverpool, in the County of Lancaster, 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 relates to apparatus employed in superheating the mixture
of air and water vapour for use in the manufacture of gas by gas producers.
The superheating of the air and water vapour is effected by absorbing a
portion of the heat from the producer gases as they pass to the ammonia recovery
plant and thence to the furnaces. The abstraction of the heat is usually effected
by causing the hot producer gas and the cold mixture of air and water vapour to
travel through concentric pipes; an arrangement which owing to the different
contractions and expansions, leads to destruction of the apparatus.
According to this invention superheaters for this purpose are constructed as
hereinafter described with reference to the accompanying drawings.
Figure 1 is a vertical section. Figure 2 is a section on the line 12 Figure 1
and Figure 3 is a part plan and part section on the line 3 4 Figure 1. The
pipes A (preferably four, but other number may be used) conveying the hot
producer gases are encased in a preferably rectangular iron chamber B (furnished
with baffle plates b) through which the air to be superheated is caused to flow,
and combined with the said pipes, are boxes to catch the dust which accompanies
producer gases. The said pipes are connected alternately at top and bottom by
connecting boxes C which are built outside the said chamber B so that with the
pipes A they form practically one long zig-zag pipe. The gases from the producer
enter the first pipe at a near the bottom and at one end of the superheating
chamber and, after passing upwards and downwards several times, according to
the number of pipes used, the said gases leave at a at the other end of the
chamber. The air and steam enter the superheating chamber at 2 near the top
and at the side at which the producer gases are leaving and are caused by the
baffle plates projecting alternately from the top and bottom of the rectangular
chamber to travel outside the pipes A and in a direction opposite to that taken by
the gases through the said pipes and leave through an exit pipe near. the
bottom at the far end of the superheating chamber that is the end nearest to
the gas producing chamber. The dust boxes are, in the case of the entering and
exit pipes A, prolongations of these pipes below the bottom of the superheating
chamber as shewn at a and they are furnished at their lower ends, with doors
through which the dust can be removed. In the case of the intermediate pipes A
the dust box is constituted by the connecting box C which is in the forni of a
hopper also provided with a door below. This hopper is sufficiently large to
cause a diminution in the gas current at this point and thus aid the settlement
of the dust.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we declare that what we
claim is
-
1. A superheater for use in connection with gas producing apparatus the said
superheater consisting of pipes connected alternately at top and bottom and pro-
ith Jnd t....

page_text: encased in a chamber provided with an inlet and outlet for air and steam and with
baffle plates so that the air and steam pass through the chamber in contact with
the pipes in a direction the reverse of that taken by the gases substantially as
hereinbefore described.
2. A superheater for use in connection with gas producing apparatus, the said
superheater consisting of pipes connected alternately at top and bottom and pro-
vided at bottom with dust boxes the dust box forming the said connection in
the case of intermediate pipes the said pipes being encased in a chamber provided
with baffle plates, the said series of pipes being provided with an inlet and
outlet for the gases and the said chamber being provided with an inlet and outlet
for air and steam so arranged that the air and steam pass in contact with the
pipes in a direction the reverse of that taken by the gases substantially as herein-
before described.
Dated this 98th day of May 1900
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.