US525540A

US525540A - flodquist

Info

Publication number: US525540A
Authority: US
Publication date: 1894-09-04
Anticipated expiration: 1911-09-04

Description

2 Sheets-Sheet 1.

(No Model.)

0. W. PLODQUIST. APPARATUS'POR THB. MANUFAGTURB oF cELLULosE. No. 525,540.

Patented Sept. 4, 1894.

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No Model.) 2 Sheets-Sheet 2.

C. W. FLODQUIST. APPARATUS PoR THB MANUFAGTURB 0F cELLULosB.

No. 525,540. Patented Sept. 4, 1894.

FISQ.

M/MJD UNITED STATES i PATENT OFFICE.

CARL WALDEMAR FLODQUIST, OF STOCKHOLM, SWEDEN.

APPARATUS FOR THE MANUFACTU RE OF CELL'U LOSE.

p SPECIFICATION forming part of Letters Patent No. 525,540, dated September 4, 1894.

Application filed March 8, 1893.

To a/ZZ whom it may concern:

Beitknown that I, CARL WALDEMAR FLoD- QUIST, a subject of the King of Sweden and Norway, residing in Stockholm, in the Kingdom of Sweden, have invented certain new and useful Improvements in Apparatus for the Manufacture of Cellulose, of which the following is a specification.

My invention relates to boilers used in the manufacture of sulphite cellulose, wherein the wood fibers or particles must be boiled or digested.

In'the production of sulphite cellulose, the boiling has hitherto, in general, been effected by means of steam in such a way that the steam has been conducted either into the boiler itself, or into a casing surrounding the boiler. The rst method has the inconvenience that the boiling lye is diluted, whereby the boiling is retarded and also rendered unequal, as the lye will be mainly diluted in the top layer of the mass. The latter method requires, on the otherhand, ajacket or casing strong enough to resist a considerable pressure, as rapid boiling requires atemperature of the steam which ought not to be below 150o centigrade. Such a casing is expensive, particularly if, as is almost necessary, it is made in parts which can be separated in order that the boiler shall be accessible from without. The use of the present apparatus implies, on the contrary, no dilution of the lye, requires no strongcasing, one of the weakest kind being suicient, and still the boiling maybe effected at a temperature far higher than that rst mentioned. This apparatus employs a jacket, and hot air instead of steam for the boiling. The air is heated to the desired temperature, say 300 centigrade by means of a suitable heating apparatus, and is led into the casing or jacket surrounding the boiler at one end of the former; it flows through the jacketspace and is let out at the other end of the casing, whence it is conducted either into the open air, or back to the heating apparatus. The air need not be pure, Abut may be mixed with, or substituted by gases, as for instance those from the furnace in the heating apparatus, provided these gases are only so pure as not to cause such a deposit of soot, or the like, in the casing, as to render a frequent cleaning of the same necessary. As the hot Serial No. 465,161. (No model.)

to the boiler and to each other that they may be easily taken apart, all parts of the boiler shell being thus made readily accessible from without. The boiler may have a cylindrical shape and the joints of the easing may extend either transversely or longitudinally, but preferably the former.

In the accompanying drawings I have shown an embodiment of the invention.

Figure 1 is a longitudinal, axial section of the apparatus. Fig. 2 is an end elevation of the left-hand end of the apparatus seen in Fig. l. Fig. 3 is a transverse, vertical section on line 3, 3, in Fig. l, atl the right-hand end of the casing seen in Fig. l. Fig. 4 is a detail view of the angle-irons in the jacket-space between the boiler and casing.

.A represents the cylindrical boiler, which is provided with tubular journals, B, at its ends. These journals have rotative bearings in pillow blocks, C. The boiler maybe rotated through the medium of a worm-wheel, D, seen on the journal B at the left-hand end in Fig. 1, and a worm or screw, D. The boiler is furnished with a manhole, N, and has a steam-gage pipe, L, which latter enters the boiler through the hollow of a journal B.

The boiler is inclosed ina casing or jacket, the body, E, of which is secured tothe boiler through the medium of angle-irons, c', one of which is seen detached in Fig. 4. These angle-irons form distancing pieces and occupy the jacket-space, sc, about the boiler. In order to prevent or retard radiation of heatl from the jacket-space the jacket or casing is made double, that is ot' two shells, a and b, one Within the other, and the space between them is filled with some non-conducting material, c, as asbestos, mineral wool, &c.

The construction of the casing, as illustrated, is as follows: I-irons, d, are bent in the form of hoops or rings and extend roundwise of the jacket; and the inner series of plates, a, rest on the outer faces of the inner flanges of the rings d; the outer series of plates rest on the outer faces of the outer of the casing is non-rotative and has Ain it a` collar, e, which embraces the rotating journal of the boiler. This end portion of the casing is made of two sets of plates with interposed non-conducting material, similar to the body portion, and tits snugly up to an end-ring, d', on the latter at y, where the joint between the rotating and non-rotating parts is situated. At this point the body E is furnished with a circular bearing lip or flange, d2, which projects to form a rabbet which receives the adjacent margin of the non-rotative end-portion EX. The ring d', is supported by struts, cl3, the bases of which rest on the shell of the boiler. The hot air or gas enters the .jacket-space through the end-portion EX, by way of a pipe, H, flows through the j acket-space and escapes through the end-portion E', of the casing to abreeching, N', and outlet pipe, H'.

At the end of the apparatus seen at the right in Fig. l, the end-portion E' of the casing is continuous with the body-portion E, and of course rotates with the latter. In this end-portion are a number of apertures, o, for the escape of the hot gases from the jacketspace into the stationary breeching N', whichA fits up snugly to the apertured face of the end-portion E', inclosing said apertures; said breeching closely embraces the journal B.

In the construction shown the I-irons d extend roundwise of the casing, like hoops, as stated, but it will readily be understood by any one skilled in the manufacture of such structures how they might be made to extend longitudinally of the casing, the plates a and b then forming segments of the cylinder.

As it is not important that the joints shall be steam tight, or the casing be able to withstand anynotable internal pressure, the plates a and b may be quite thin, and each plate may extend only part way round the cylindrical casing; or in other words, the plat extending about the casing may each be made up of- Aseveral segments secured together at their edges.

Having thus described my invention, I claim- 1. The combination with the rotatvely mounted boiler having a jacket or casing, the. body portion of which is secured to and ro. tates with the boiler, of the non-rotative endportion EX, of the casing, fitting closely to the end of the body of the casing, the said casing being provided at its respective endl with an inlet and outlet for said gases, substantially as set forth.

2. The combination with a rotatively 7c mounted boiler havinga jacket or casing, the body portion of which is secured to and rotates with the boiler and is provided with aperturcs o, in its end, of the stationary breeching N', at the end of the casing and inclol- .15 ing said apertures, said breeching being provided with an outlet for gases, as set forth.

3. The combination with the rotativlalyV mounted boiler A, having hollow journals to provide access for determining the internal 8o pressure, of the casing E, EX, E', about slid boiler, said casing having an inlet for hot gases at one end and an outlet for said gasa. at the other end, substantially as set forth.

4. The combination with the boiler, of the l5 non-conducting casing E,comprisinga Serin of ring-like, flanged I-'irons, d, an inner series of plates a, resting on and secured tothe outer faces of the inner flanges on said irong,

the outer series of plates b, resting on and It d4