US1061767A

US1061767A - Wood-pulp digester.

Info

Publication number: US1061767A
Application number: US65101511A
Authority: US
Inventors: John Charles William Stanley
Original assignee: STANLEY PAPER FIBRE Co
Current assignee: STANLEY PAPER FIBRE Co
Priority date: 1911-09-25
Filing date: 1911-09-25
Publication date: 1913-05-13
Anticipated expiration: 1930-05-13

Description

J. G. W. STANLEY.

WOOD PULP DIGESTER.

APPLICATION FILED 8EPT.25,1911.

1,061,767. Pa ented May13,1913.

oloooQcncoo m 45 2 A" J 24 25 .6

can inc- 1 ES WILLIAM STEY, 01F SAN 1ilE'tJhN'fJIlTSCO, CALIFORNIA, ASSIGNOE, BY

DIEEGT AND MESNE ASSIGNMEIIIS, TO STANLEY lPAlPER FIBREBOMZPANY, OFJSAN .FMNCISCO, CALIFORNIA, A CORPORATION OF ARIZONA.

WQOID-PULP DIGESTEB.

Specification of Letters Eatent.

Patented May 113, 1913.

- ing is a specificatlon.

This invention relates to a digester :ior the cooking of wood, straw, flax and other material for the manufacture of pulp.

The object of this invention is to provide adigester for cooking wood, straw, flax and other fibrousrnaterial in large quantities and to provide a sim lo and e 'cient means'for drawing ofi the i uors in which the materials are cooked, an .for washing and cleansing the pulp so that it will be entirely free from the chemical solutions employed in its digestion.

A further object is to provide means by which the digesting solution may be con.-

densed and the chemicals contained therein separated therefrom. I

Other objects will appear hereinafter. The inventlon consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanyring? drawings, in Wh1Cl'1- igure 1 is .a vertical, sectional view of the invention partly in elevation and partly in diagram. Fig. 2 is a horizontal section on the line X-X of Fig. 1.

In the drawings, A represents the digester which consists ofia vertically disposed cylinder, of any suitable dimensions, and built of such materials as to be able to carry a pressure of approximately from 80 to 125 pounds. The cylinder A is preferably formed of steel and is rigidly mounted on a suitable framework 2, and is provided with a dome-shaped head 3, having a feed opening formed therein which is closable by means of a steam-tight door or manhole cover 4, of any suitable description. The lower end of the cylinder A converges toward and terminates in a discharge opening which is closable by means of a peculiarly constructed ats '5 which is adapted to swing downwardi y when it is desired to empty the cylinder A of the digested pulp as later, described. The gate 5 is formed with a hollow, hemispherical dome or spray hood 7 of a diameter slightly smaller than that of the discharge opening of the cylinder A, which portion 7 is adapted to extend into the discharge opening when the mate 5 is closed. The dome 7 is rovided with a series of perforations 6 w ich iormsteam communicating passages between the interior of the dome 7 and the interior of the cylinder A, and whereby steam from a pipe 8 is admitted to the digester for the purposes shortly to be described. Pipe 8 connects with a flexible hose 9 leading to a pipe 10, which in turn connects with a steam 1pc 11 leading from any suitable source 0 steam supply; a cut-oil valve 12 being disposed between the

pipes

10 and 11 at any convenient point. An air pipe 13, leading from any suitable source of air supply, and a pipe.l4, leading from any suitable source of water sup 1y, intersect the pipe 10; and a pipe 15 lea s from the pi e 10 adjacent to the valve 12 and opens to tie interior of the c linder A adjacent to its upper end. Cut-

o valves

16 and 17 are disposed in the pipes 13 and 14 respectively. A cut-ofi' valve 18 is disposed in the pie 10 near its lower end and a like valve 19 15 disposed in the pipe 15 at a point adjacent to the cylinder A.

Mounted within the cylinder A, centrally thereof, is a vertically disposed, perforated pipe 20, the upper end of which extends to a point a short distance above the middle of the cylinder A and terminates in a manifold coupling 21; the lower end of the pipe 20 being a apted to be connected with an 0 ening 22 leading through the wall' of the ome 7, when the gate 5 is closed.

A pipe 23 connects with the pipe 10 below '28. The lower end of the con enser coil 24 v plings 31 adjacent to the inner wall .of the cylinder A. Mounted in the couplings 31 are vertically disposed, perforated pipes 32 which? end upwardly to a point a shortv distance below the dome 3 of the cylinder A and downwardly to a point a short distance above the converging portion of the lower.

end ofthe cylinder.-

' The

pipes

20 and 32 are supported in the cylinder A by means of brackets 33 which are mounted on the inner wall of the cylinder vand are connected to the T-couplin'gs A cut-0d valve 34 is disposed in the pipe 20 adjacent to its upper end, which valve is operated through a stem 35 extending through a stug-box 36 in the wall of the cylinder A to the exterior "thereof and is provided with a hand-wheel on lts outer end by which the valve 34 may be opened or closed from the exterior of the cylinder A.

In the operation of the invention the gate 5 is closed'and the cylinder A is filled with wood or othermaterials to be treated, pre-- viously reduced to a suitable size, which is delivered to the interior of the cylinder A through the feed opening in the up er end thereof. During this procedure

t e cutofi valves

12, 16, 17 18, 19 and 25 are closed.-

A suitable-solution of caustic soda, sulfate of soda, or'other appropriate substances, is

then delivered to the interior of the cylinder A in suficient quantities to practically submerge the materials previously placed therein. This solution may be tormed by mixing the dry powdered chemicals with the materials to be treated and then admittingwater tojthe Interior'of the cylinder A through the

pipes

14, 10 and 15 by opening the

valves

17 and 19. This being done, the cover 4: is,closed, whereupon the valves'l'? and 19 are-closed, and the

valves

12, 18

and 34 are opened to admitof the passage of-steam to the interior of the cylinder A through the perforated bottom ordome 7, formed on the gate 5, and through the perforated .pipe sections 32 on the perforated standard 20,- which are so arranged as to insure a thorough distribution of steam throughout the mass contained in the cylinderA. When steam pressure in the cylinder equals boiler pressure the valve 19 is opened. Thesteam is delivered to the cylinder A at' a pressure ranging from 80. to 100 pounds pressure and raises the temperature of the solution in the reservoir A to approximately the boiling point. When the cooking is completed, WlllCh may be any Loan-re? fibrous materials to pulp, usually about eight hours, the

valves

12, 18 and 19 are closed and the valve 25 in the pipe 23 which leads to the condenser coil 24 is opened so as to allow the solution in the cylinder 'A to dram therethrough; the solution passing .outthrough the pipe 20 and the dome 7.

The liquor being drained from the'cylinder A, the valves 34 and 25 are closed and water is delivered to the interior of the cylinder through the

pipes

10 and 15 andsvalves 17 and 19, which water flows throughout the digested pulp and acts to wash and cool the pulp.

Valves

17 and 19 are then closed. Thevalves 16 and 18 are then opened to admit air to the cylinder through the dome 7 at the bottom closure. hen air pressure in the cylinder A reaches approximately eighty pounds pressure per. square inch, the

valve 18 is closed and the valve 25 is opened which allows the wash-water to flow to the tank 29 through the condenser coil 24. The pressure of the air acts to force the liquids in the cylinder out through the pipe 20 and perforated dome- "to. the condenser '24, and thereby thoroughlyv cleanses and cools the pulp in the cylin er A. This being done, the valve 25 is closedand the gate 5" is opened so as to permit the digestedjand cleansed .pulp to discharge through the lower end of the cylinder into a receiving hopper, of any suitabledescription, from whence it is removed for further treatment. The discharge of the pulp from the cylinder A is facilitated by directing the airpressure into the upper end of the cylinder by opening the valve 19 so as to bear upon the pulp and force it downward; the valve'34 being closed to prevent the escape of the air through the pipe 20. The liquids drained it it from the cylinder A contain the chemi- 29 and evaporating it. v

The thorough removal of the digesting solution from the pulp is important, inasmuch as it renders the pulp purer and at the same time admits of the chemicals therein being restored and makes possible the acquirement of by-products accumulated in the digesting process.

The gate 5 is here shown as mounted on an arm 37 on a shaft 38 on which a toothed acorns? segment 39 is mounted. A worm 40 meshes with the segment 39 and is adapted to be rotated, by means of a hand-wheel 41 so as to rock the shaft 38 and thereby swing the gate to open or close the discharge opening in the lower end of the cylinder A. 'Bolts 42, pivoted on the cylinder,

- are adapted to pass between lugs on the periphery of the gate 5 when the latter is closed, and nuts 43 are screwed on the lower end of the bolts to securely clamp the gate 5 in its closed position.

' An important feature of this invention resides in the means for introducing air under pressure to the interior of the container both at'its upper and lower ends. In the latter instance it acts to agitate the pulp to perwit the wash-water to percolate throughout the mass and thereby insures a thorough cleansing action taking place. This also serves to rapidlg cool the (pulp so that it may be readily Iandled an. worked immediately after its discharge from the container; the delivery of the air to the upper end of the container acting, as before mentioned, to quickly force the cleansed pulp out oi the discharge opening after the washwater has been drained therefrom Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. In a digester, the combination with a digesting tank'having a perforated dome in the bottom thereof, of means for delivering steam, air and fluids under pressure to the upper end of the tank, means for distributing steam, air and fluids through the interior of the tank, comprising a plurality of perforated, horizontally and vertically arranged tubes connected together; a condenser, and means for delivering steam, air and fluids through the perforated dome in the bottom of the tank to said condenser.

2. A digester which includes a vertically disposed, cylindrical container having a feed opening at its upper end and a discharge openmg at its lower end, a closure with a perforated dome for said discharge opening, said dome consisting of a hemispherical, perforated hood smaller in diameter than the diameter or' said discharge opening, a vertically disposed, perforated pipe in the container opening at its lower end to the interior oi the perforated dome, and a cut-0d valve in said pipe operable from the exterior of the container.

3. A digester which includes a vertically disposed, cylindrical container having a feed opening at its upper end and a dis charge opening at its lower end, a closure with a perforated dome for said discharge opening, said dome consisting of a hemispherical, perforated hood smaller in diameter than the diameter of said discharge opening, a vertically disposed, perforated pipe in the container opening at its lower end to the interior of the perforated dome, a cutofi' valve in said pipe operable from the exterior of the container, radial pipes leading from the upper end of said perforated pipc above said valve, and a vertically disposed, perforated pipe connecting with the outer end of each of said radial pipes.

at. A digester consisting of a container having a teed opening at its upper end and a discharge 0 ening at its lower end, closures for sai openings and a perforated partition plate at the lower end of the container and forming with said bottom closure 21 fluid chamber which is in communication through said perforations with the container and m communication with a source of steam pressure sup ly and also in communi cation with the discharge for the liquid, said partition plate having a perforated hollow column extending upwardly from it and means for delivering air under pressure into the top of the container.

5. A di ester consisting of a container havin a eed opening at Its upper end and a disc arge o ening at its lower end, closures for sai openings and a perforated partition late at the lower end of the container an forming with said bottom closure a fluid chamber which is in communication through said perforations with .the container and incommunication with a source of steam pressure supply and also in communication with the discharge for the liquid, said partition plate having aperiorated hollow column extending u wardly from it, means for delivering air un er pressure into the top of the container, said column having perforated radial branches with vertical perforated hollow terminals, said chamber below the partition plate and column, branches and terminals so constructed and arranged to afford a percolating system for the steam and fluid through the material undergoing digestion.

6. A di ester consistln of a container having a eed opening at its upper end and a discharge 0 ening at its lower end, closures for sai openings and a perforated partition late at the lower end of the container and forming with said bottom closure a fluid chamber which is in communication through said perforations with the container and in communication with a source of steam pressure supply and also in communication with the discharge for the liquid, said partition'plate having a perforated hollow column extending upwardly from it, means for delivering air under pressure into the top of the container, said column having perforated radial branches with vertical perforated hollow terminals, said chamber below the partition plate and column, branches and terminals soconstructed and arranged to afford a percolatmama ing system for the steam and fluid through my hand in the presm bf o s ubs crib" the; material dundergging digestign, and a, WMZHQSSQS. va ve dispose in san column an operable & from outside the digester to interrupt com- WILLIAM w 5 munication between said chamber below the Wimesws:

partition plate and. saiol branches. JQHN H; E cm-.5

In testimamy WhQEGBQ]? I have hereunto set CHARLES EDELMAN, 1