Improvements relating to Apparatus for Boiling Wood-pulp.
Year: 1890

page_text: Date of Application, 8th Oct., 1890-Accepted, 8th Nov., 1890
COMPLETE SPECIFICATION.
Improvements relating to Apparatus for Boiling Wood-pulp.
1, FREDRIK VILHELM LOUIS HIORTH, of Christiania, in the Kingdom of Norway,
Civil 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 :-
My invention relates to an arrangement for connecting together a number of wood-
pulp-boilers for the purpose of utilizing the gas and heat which are set free during
the boiling of the wood-pulp and it consists in the employment and adaptation to the
boilers of a series of pipes and valves whereby the said gas and heat can be conducted
directly from one boiler to another to be there employed to heat and decompose the
raw material contained therein.
In order to enable my invention to be fully understood I will describe how it can be
carried into practice by reference to the accompanying drawing in which :-
Figure is an elevation of a number of vertical boilers connected together according
to my invention and,
Figure 2 is a similar view but showing my invention applied to a number of
horizontal boilers.
Instead of allowing the gas after the boiling of the wood-pulp is completed to
escape into the open air or into special receivers constructed for that purpose as has
hitherto been the practice I unite the boilers by a system of pipes in such a manner
that the boiler in which material is being boiled can at any time without the process
being interrupted, be brought into communication with the following boiler in which
material is to be hoiled. The gas which is evolved in the first boiler is, after the
boiling is completed conducted into another boiler which is, by that means, heated,
and from which the gas is conducted to a third boiler and so on thereby completely
using the gas and its accompanying heat.
The boiler a for this purpose is connected with the main pipe b above by pipes c
and d the pipe d extending down between the boilers to a joint or socket e whereby it
is connected to a revolvable elbow-pipe the flanges of which exactly fit the flanges
of valves g g', the valve g is connected by means of a pipe with the boiler a and the
valve g' is connected by means of a pipe h' with the boiler a', which like the boiler a
is connected with the main pipe above by an elbow-pipe c'. The following pair of
boilers is connected in the same manner whereby each of them can through the common
main pipe b be connected with the other.
From the boiler a the gas is conducted through the pipes c, b, d, f and h' into the
boiler a from which through the pipes cl, b, d, and it can be conducted to the
boiler a³, whence the gas can be conducted to a fourth boiler in the same manner as
from the boiler a to a¹, and so on.
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. The combination with a number of wood-pulp-boilers, for the purpose of forming
communication between them, of an arrangement consisting of a main pipe
common to all the boilers, which pipe b is connected with each of the boilers in such a
manner that the gas forced out of the top of the boiler can be conducted down to the
bottom part of the following boiler and be used for heating and decomposing the raw
material contained therein, substantially as herein before described.
2. The combination with a number of wood-pulp-boilers of a main pipe b connected
with the boilers at the top by pipes c, c', e² and below by pipes d, d' which by means

page_text: of movable elbow pipes, can be placed in communication with either boiler of
each pair, substantially as herein before described.
Dated the 8th day of October 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.