Recovering Soda from Black Liquor.
Year: 1886

page_text: Date of Application, 11th June, 1886.
Complete Left, 5th Mar., 1887.
Complete Accepted, 15th Apr., 1887.
and Recovering Soda from Black Liquor.
I, BERNARD DAWSON, of York House, Malvern Link, in the County of Worcester,
Engineer, do hereby declare the nature of this invention to be as follows:-
As is well known, it is necessary to evaporate waste lyes and incinerators or appa-
ratus of various types have been employed for the purpose of effecting such evaporation
and recovery of the soda from black liquor. In such apparatus it has heretofore been
usual to employ solid fuel, but it has not been found practicable with such fuel to
effect surface evaporation in an efficient manner.
Now this invention has for object to obtain a more extended flame such as will
onable surface evaporation to be more efficiently effected, for which purpose gaseous
fuel in lieu of solid fuel is employed. Apparatus adapted for the use of such fuel
according to this invention may be constructed in various forms, the gas being
generated in producers of any suitable construction and introduced into the apparatus
with a due proportion of air in such a manner that the flame may extend over prac-
tically the entire surface of the liquor to be evaporated. By my invention fuel of
comparatively low price may be employed, the nuisance from emission of smoke may
be prevented, more liquor can be evaporated in a given time than has been usual when
employing solid fuel such as coal or coke, and there will be less liability to wear or
destruction of parts of the apparatus.
Dated th th 1... CT 1000
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.

page_text: and Recovering Soda from Black Liquor.
I, BERNARD DAWSON, of York House, Malvern Link, in the County of Worcester,
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:―
As is well known it is necessary to evaporate waste lyes, such as those containing
soda obtained in the manufacture of paper, and incinerators or apparatus of various
types have been employed for the purpose of effecting such evaporation and recovery
of the soda from black liquor. In such apparatus it has heretofore been usual to
employ solid fuel but it has not been found practicable with such fuel to effect surface
evaporation in an efficient manner.
Now this invention has for object to obtain a more extended flame such as will
enable surface evaporation to be more efficiently effected, for which purpose gaseous
fuel in lieu of solid fuel is employed. Apparatus adapted for the use of such fuel
according to this invention may be constructed in various forms, the gas being
generated in producers of any suitable construction, and introduced into the apparatus
with a due proportion of air in such a manner that the flame may extend over
practically the entire surface of the liquor to be evaporated.
By my invention fuel of comparatively low price may be employed, the nuisance
from emission of smoke may be prevented, more liquor can be evaporated in a given
time than has been usual when employing solid fuel such as coal or coke and there
will be less liability to wear, or destruction of parts of the apparatus.
On the accompanying sheet of drawings there is shewn a part of an Arnot's
incinerator for evaporating lyes, provided with gas apparatus according to this
invention, for the production of the heat by which the process is effected.
Fig. 1. shews an end elevation.
"
2. a longitudinal section.
and Recovering Soda from Black Liquor.
I, BERNARD DAWSON, of York House, Malvern Link, in the County of Worcester,
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 :-
--
As is well known it is necessary to evaporate waste lyes, such as those containing
soda obtained in the manufacture of paper, and incinerators or apparatus of various
types have been employed for the purpose of effecting such evaporation and recovery
of the soda from black liquor. In such apparatus it has heretofore been usual to
employ solid fuel but it has not been found practicable with such fuel to effect surface
evaporation in an efficient manner.
Now this invention has for object to obtain a more extended flame such as will
enable surface evaporation to be more efficiently effected, for which purpose gaseous
fuel in lieu of solid fuel is employed. Apparatus adapted for the use of such fucl
according to this invention may be constructed in various forms, the gas being
generated in producers of any suitable construction, and introduced into the apparatus
with a due proportion of air in such a manner that the flame may extend over
practically the entire surface of the liquor to be evaporated.
By my invention fuel of comparatively low price may be employed, the nuisance
from emission of smoke may be prevented, more liquor can be evaporated in a given
time than has been usual when employing solid fuel such as coal or coke and there
will be less liability to wear, or destruction of parts of the apparatus.
On the accompanying sheet of drawings there is shewn a part of an Arnot's
incinerator for evaporating lyes, provided with gas apparatus according to this
invention, for the production of the heat by which the process is effected.
Fig. 1. shews an end elevation.
2. a longitudinal section.
"
"3
3. a sectional plan.
4. a cross section.
In these views only a small portion of the bath is shewn.
A, is the main gas flue from the Gas Producers.
B. is a gas valve box containing a mushroom valve C, worked by the spindle and
hand wheel C. This valve box has two openings one at each side connected with gas
flues A', A; the quantity of gas required in the furnace being regulated by the
mushroom valve C.
A is an enclosed chamber partly filled with firebricks loosely stacked, these latter
being for the purpose of splitting up the current of gas when it is being admitted
into the chamber.
D, D. are two openings for admitting air into the enclosed chamber E¹ E¹. The
1

page_text: E, E, E, E. are auxiliary air ports for admitting air into the chamber E¹. These
may also be provided with covers or slides for regulating the air admission.
K, K, K, K are openings left in the arch M to allow the air in the chamber E¹ to
pass through and mix with the gas issuing from chamber A.
F. F. F. F. are air inlet ports for admitting air into the enclosed chamber G
and H. H. H. H. H. H. H are the outlet ports whence the air passing round chamber G
is allowed to issue and mix with the gas proceeding from chamber A³.
Lis the bath or chamber containing the waste lyes to be evaporated.
The method of operation of this apparatus for evaporating waste lyes by the com-
bustion of gas is as follows:-Gas is admitted from the main gas flue A by means of
the valve Cand passes out at each side of the gax box B into the two flnes A¹ A¹
travelling onwards into the chamber A2, where it is split up and diffused through the
chequer work shewn. The air necessary for combustion is supplied through the various
passages shewn, one part of it passing through openings D. D; E. E. E. E, into the
chamber E and thence through the openings K. K. K. K in the arch M, while
another part of the air is taken into the ports F. F. F. F passing into the chamber G
and allowed to mix with the gas through the openings H. H. H. H. H. H. H. The
air becomes split up in this way and is also partially heated and mixes intimately with
the gas the result being that perfect combustion takes place where the gas and air
meet. The flame and products of combustion then pass into the chamber L over
the waste lyes to be evaporated and are finally carried in the ordinary way to the
chimney.
The direction of the gas is shewn on the drawing by arrows,
dotted arrows.
that of the air by
As will bo evident the details of construction of the apparatus may be variously
modified, so long as the arrangement he such as to admit of the use of gaseous fuel in
lieu of solid fuel, in such a manner that the flame may extend over practically the
entire surface of the liquor to be evaporated.
Having now particularly described & ascertained the nature of the said invention
and in what manner the same is to be performed I declare that what I claim is.-
For the purpose of evaporating waste lyes and recovering soda therefrom, the use
in combination with a pan or receptacle or receptacles for containing the waste lye or
liquor, of apparatus in which combustion of gaseous fuel is effected, the arrangement
being such that the resulting flame and products of combustion are caused to pass
over the surface of the waste lye or liquor for the purpose specified.
Dated this 3rd day of March 1887.