Improvements in or connected with Boilers for Boiling or Chemically Treating and for Washing Esparto and other Grasses, Straw, Wood, Rags, and other Fibrous Materials for Paper Making.
Year: 1893

page_text: Date of Application, 6th July, 1893
Complete Specification Left, 5th Apr., 1894-Accepted, 5th May, 1894
PROVISIONAL SPECIFICATION.
Improvements in or connected with Boilers for Boiling or
Chemically Treating and for Washing Esparto and other
Grasses, Straw, Wood, Rags, and other Fibrous Materials for
Paper Making.
I, GEORGE SINCLAIR, of Albion Boiler Works, Leith, in the County of
Mid Lothian, North Britain, Boiler Maker, do hereby declare the nature of this
invention to be as follows, that is to say :-
My said invention relates to boilers similar to those described in my Patent
Specifications No. 2035 of 1880, and No. 6441 of 1893.
A boiler as made with my present improvements is in the form of a vertical
cylinder with curved top and bottom, there being near the bottom a perforated
horizontal plate or diaphragm on which rest the fibrous materials to be operated
on. Between the bottom and the perforated plate there is, near the latter, a
horizontal plate or diaphragm which is unperforated except where it has fixed to it
certain short dipping pipes and either a central vertical vomiting pipe or two or
more vomiting pipes or passages extending up the sides of the boiler.
In the ordinary way of working steam introduced at the bottom causes a circula-
tion of the liquid up through the vomiting pipe or pipes and down through the
fibrous materials.
My present invention has for its objects to produce a reverse circulation, after
the ordinary circulation has acted for some time, or alternatingly with the ordinary
circulation; and to wash the materials whilst still in the boiler, free from the
alkaline or other chemical liquid employed, I provide an additional inlet pipe for
steam or other fluid in connection with the bottom of the boiler, this pipe having
a nozzle inside the boiler and entering one of the dipping pipes herein before
mentioned. When steam enters by the additional pipe it gets between the perforated
plate and the plate immediately below it and acts in an upward direction on the
fibrous materials and liquid causing the liquid to ascend and to return downwards
through the pipe or pipes acting as vomiting pipes with the ordinary circulation.
The additional inlet pipe extends up the outside of the boiler and is fitted with a
stopcock or valve at about the level of the top of the boiler. Above that level
the side pipe has connected to it an injector which is connected to the steam supply
pipe, and which is provided with a valved inlet through which air can be admitted
or water. When the chemical liquid has acted for a sufficient time it may be
drained off in the ordinary way, and then water, by preference in a heated state
may be forced in by the steam injector, which may also be used for forcing in air
to agitate and act on the contents of the boiler.
Dated this Fifth day of July 1893.
EDMUND HUNT,
Applicant's Agent. .

page_text: COMPLETE SPECIFICATION.
Improvements in or connected with Boilers for Boiling or
Chemically Treating and for Washing Esparto and other
Grasses, Straw, Wood, Rags, and other Fibrous Materials for
Paper Making.
I, GEORGE SINCLAIR, of Albion Boiler Works, Leith, in the County of
Mid Lothian, North Britain, Boiler Maker, 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, that is to say :-
My said invention relates to boilers similar to those described in my Patent
Specifications No. 2035 of 1880 and No. 6441 of 1893.
A boiler as made with my improvements is constructed so that (like my former
arrangements) in the ordinary way of working, steam introduced at the bottom
causes a circulation of the liquid up through vomiting pipes and down through the
fibrous materials.
My present invention has for its objects to produce a reverse circulation, after
the ordinary circulation has acted for some time, or alternatingly with the ordinary
circulation; and to wash the materials while still in the boiler, free from the
alkaline or other chemical liquid employed. I provide an additional inlet pipe, for
steam or other fluid in connection with the bottom of the boiler, through which the
steam enters and acts in an upward direction on the fibrous materials and liquid,
causing the liquid to ascend and to return downwards through the vomiting pipes.
The additional inlet pipe extends up the outside of the boiler and is fitted with a
stopcock or valve at about the level of the top of the boiler. Above that level
the side or inlet pipe has connected to it an injector, which is connected to the
steam supply pipe, and which is provided with valved inlets for admitting water
or air.
And in order that my said invention and the manner of performing the same may
be properly understood 1 hereunto append a sheet of explanatory drawings, to be
hereinafter referred to, and showing a sectional elevation of two boilers as made
with modifications of my improvements. In these drawings the same reference
letters are used to mark the same or like parts wherever they are repeated.
The boilers, A, and, B, are each in the form of a vertical cylinder with curved
top and bottom, there being near the bottom a perforated horizontal plate or
diaphragm, C, on which rest the fibrous materials to be operated on. Between the
bottom and the perforated plate, C, there is near the latter, a horizontal plate or
diaphragm, D, which is unperforated except where it has fixed to it certain short
dipping pipes, E, and either a central vertical vomiting pipe, F, (as shown in the
boiler, A) or two or more vomiting pipes or passages, F, (as shown in the boiler, B)
extending up the sides of the boiler.
In the ordinary way of working the boiler, A, steam is introduced at the bottom
by the pipe, G, (as in my former arrangements) and causes a circulation of the
liquid up through the vomiting pipe or pipes, F, and down through the fibrous
materials.
As means for producing a reverse circulation, after the ordinary circulation has
acted for some time, or alternatingly with the ordinary circulation; and for washing
the materials while still in the boiler, A, free from the alkaline or other chemical
liquid employed, I provide an additional inlet pipe, H, for steam or other fluid,
fixed to the bottom of the boiler, A, and communicating through a short pipe, I, with
the space between the perforated plate, C, and the horizontal plate, D. When the
steam enters by the additional pipe, H, it gets between the perforated plate, C,
and the plate, D, and acts in an upward direction on the fibrous materials and
liquid causing the liquid to ascend and to return downwards through the pipe, F,

page_text: (which acts as a vomiting pipe with the ordinary circulation). The additional
inlet pipe, H, extends up the outside of the boiler, A, and is fitted with a stop
valve, J, at about the level of the top of the boiler. Above that level the
additional inlet pipe, H, has connected to it a two-branched pipe, K, and an
injector, L, which latter has connected to it a steam supply pipe, M. A part, N,
of the injector has laterally connected to it two stop valves, P, Q, one for admitting
water from a pipe, R, and the other for admitting air. When the chemical liquid
has acted for a sufficient time it may be drained off in the ordinary way, and then
water, by preference in a heated state, may be forced in by the steam injector, L,
which may also be used for forcing in air to agitate and act on the contents of the
boiler.
The injector, L, may be used for forcing in air or water so as to circulate in the
ordinary way, for which purpose the parts are arranged as shown in connection
with the boiler, B. The injector, L, is connected by a pipe, S, to the boiler, B,
the pipe, S, being fitted with a stop valve, T, and communicating with the internal
space below the plate, D.
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 :-
1. In boilers for boiling or chemically treating and for washing esparto and other
grasses, straw, wood, rags, and other fibrous materials for paper making, providing
an additional inlet pipe and an injector for introducing steam or other fluid in a
manner to produce a reverse circulation, substantially as hereinbefore described.
2. In boilers for boiling or chemically treating and for washing esparto and other
grasses, straw, wood, rags, and other fibrous materials for paper making, providing
an injector on an inlet pipe to inject air or other fluid into the boiler, substantially
as and for the purposes herein before described.
Dated this Fourth day of April 1894.
EDMUND HUNT,
Applicant's Agent.