Improvements in Steam Jacketted Boilers for Converting Wood and other Fibre into Pulp suitable for Manufacture into Paper or other Articles Prepared from Pulped Fibre.
Year: 1886

page_text: Improvements in Steam Jacketted Boilers for Converting Wood
and other Fibre into Pulp suitable for Manufacture into
Paper or other Articles Prepared from Pulped Fibre.
I WILLIAM TIJOU of Pinners Hall Great Winchester Street in the City of
London Engineer do hereby declare the nature of this invention to be as follows:-
In the steam jacketted boilers hitherto employed for boiling wood and other
fibres a considerable loss of time has occurred between the introduction of the
steam in the jacket and the attainment of the required temperature in the mass of
materials under treatment owing to the limited heating surface namely the
circumferential area alone of the inner boiler hitherto available in that class of
boilers. Now in order to remedy this defect and consequently to expedite the
process of boiling I propose according to my invention to increase the heating
surface of this class of boilers and also to facilitate the distribution and circulation
of the primary heating steam throughout the mass of materials under treatment in
the inner boiler, by providing such inner boiler with any desired number of cross
steam tubes communicating at each end with the jacket at any number of points
round the circumference of the inner boiler to which they may be secured by
flanges and rivets. The said tubes may either be parallel or more or less tapered
and may be placed either at right angles to the longitudinal axis of the boiler or at
any other convenient angle to the said axis. These cross tubes as also the interior
of the inner boiler would be covered with lead as is well understood in the class of
boilers referred to in order to protect the iron of the boilers from the destructive
action of the chemicals employed in the treatment of the wood or other fibre.
Dated this 17th day of May 1886

page_text: Improvements in Steam Jacketted Boilers for Converting Wood
and other Fibre into Pulp suitable for Manufacture into
Paper or other Articles Prepared from Pulped Fibre.
I WILLIAM TIJOU of Pinners Hall Great Winchester Street in the City of
London, 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 :—
In the steam jacketted boilers hitherto employed for boiling wood and other
fibres in the process of their conversion into pulp a considerable loss of time has
occurred between the first introduction of the steam in the jacket on starting the
apparatus and the attainment of the required temperature in the mass of materials
under treatment owing to the limited heating surface namely the circumferential
and portion of the end areas alone of the inner shell of, the boiler hitherto available
in that class of boilers.
Now in order to remedy this defect and consequently to expedite the process of
boiling I propose according to my invention to increase the heating surface of this
class of boilers and also to facilitate the distribution and circulation of the primary
heating steam through the mass of materials under treatment in the inner shell
of the boiler by providing such inner shell with any desired number of cross
circulating steam tubes communicating at both ends with the jacket at any number
of points round the circumference of the inner shell to which they may be secured
in any convenient manner as for example by flanges and rivets. The said tubes
may either be formed with parallel sides or be more or less tapered and of any
convenient section and may be disposed either horizontally that is to say at right
angles to the longitudinal axis of the boiler or at any other convenient angle or
inclination thereto. The outer surfaces of these cross tubes as also the interior of
the inner shell of the boiler which will be constructed of iron or steel should be
covered or lined with lead as is well understood in the class of boilers referred to in
order to protect the iron or steel of the boilers and cross steam tubes from the
destructive action of the chemicals employed in the treatment of the wood or other
fibre and to prevent the discoloration of the pulp which would be caused by the
solution of the iron or steel.
'
-
Figure of the drawings annexed is a vertical section of my improved boiler
taken along the line 1-2 in Figure 2 the usual cover and blow out valve being
omitted as also the lead lining above referred to.
Figure 2 is a horizontal section of the same taken along the line 3-4 in
Figure 1.
1
a is the outer steam jacket surrounding the inner shell or boiler b and provided
with the usual hollow.trunnions cc and stuffing boxes for the reception of the
steam inlet pipes d and e as is well understood, the boiler being fitted with the
usual blow out cocks and pressure guages. ff are the cross steam circulating
tubes or passages passing. diametrically or otherwise across the inner shell or
boiler b from side to side thereof and opening into the steam jacket at both ends.

page_text: These cross tubes which may be of any convenient shape in transverse section are
disposed at suitable intervals along the length of the boiler and by preference so as
to break joint with each other round the inner shell, to the inner sides of which
their opposite ends are rivetted or otherwise secured.
In Figure 1 I have represented one of the said cross tubes marked f¹ of tapered
form and disposed at a slight inclination.
It is obvious that the aforesaid cross steam circulating tubes may be applied
either to new or to existing boilers.
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 ;-
For boiling wood and other fibres in the process of their conversion into pulp the
construction and arrangement of steam jacketted boiler with steam circulating
tubes across the inner shell or boiler in communication with the surrounding steam
jacket substantially as specified.