US380670A

US380670A - Chusetts

Info

Publication number: US380670A
Authority: US
Publication date: 1888-04-03
Anticipated expiration: 1905-04-03

Description

2 Sheets-Sheet 2' (No Model.)

J. E. WARREN & F; A.

OLOUDMAN.

A APPARATUS FOR THE RECOVERY OF SODA. No. 380,670. Patented Apr. 3,1888.

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JOHN E. \VARREN AND FRANCIS A. GLOUDMAN, OF CUMBERLAND MILLS, MAINE, ASSIGNORS TO S. D. WARREN & COMPANY, OF BOSTON, MASSA- OHUSETTS.

APPARATUS FOR THE RECOVERY OF SODA.

$PECIFICATION forming part of Letters Patent No. 880,670, dated April 3, 1888.

Application filed April 22, 1887. Serial No. 235,765. (No model.)

To all whom it may concern.-

Be' it known that we, JOHN E. \VARREN and FRANoIs A. CLOUDMAN, both of Cumberland Mills, county of Cumberland, and State of Maine, have invented an Improvement in Apparatus for the Recovery of Soda, of which the following description, in connection with the accompanying drawings, is a specification, like letters onthe drawings representing like IO parts.

This invention relates to an apparatus or furnace for reclaiming chemicals from the spent liquors of pulpmill digesters, and is an improvement upon the furnace shown and described in United States Patent No. 319,956,

dated June 16, 1885. 7

One of the features of our invention consists in providing the evaporating-chamber with, preferably, a series of screw-conveyers located near the bottom or hearth of the said chamber, and by means of which the liquid, which in most cases will be of a sirupy consistency when it reaches the bottom of the said chamber, may be fed forward toward the inlet 2 5 to the rotary calcining or incinerating furnace.

Our invention further consists in providing the rotary calcining-furnace with an agitating device, herein shown as a screw-conveyor or worm, by means of which the soda or other 3o chemical therein may be detached from the walls of the said furnace, thereby preventing the inner walls of the furnace from becoming coated or lined with chemicals.

Another feature of our invention consists in providing the combustion-furnace, near the outlet of the calcining-furnace, with a throat having a surrounding water-jacket through which the spent liquor is circulated before entering the evaporating-chamber, the said 7 4o spent liquor serving to somewhat cool the said throat, thereby permitting the latter to be made of iron and to be projected into the outlet of the rotary calcining-furnace, iron being the most desirable material from which 5 to construct the said threat, but which could not be used to advantage hitherto on account of the intense heat in the fire-chamber, the iron, if used in furnaces made hitherto without the hollow throat having liquid circulating therethrough, being burned out in short time, thereby rendering necessary repairs, which occasioned delay and expense.

Figure 1 is a longitudinal section of our improved apparatus for reclaiming chemicals in spent liquors from pulp-digesters; Fig. 2, a section on line m as, Fig. 1; and Fig. 3, a sectional detail showing the'form of the waterjacketed iron throat, the section being taken on the line 00' as, looking toward the right. 7

The rotary calcining-furnace A, provided 6: with tracks a, running on pulleys a and located between the evaporating-chamber A and the combustion-furnace A is substantially as shown and described in the patent referred to.

The combustion-furnace A constructed in the main of brick or other refractory material, is provided with a throat, a made of iron,and having a surrounding water-jacket, a substantially as shown in Figs. 1 and 3, the said iron throat projecting into the axial outlet b 7o of the calcining-furnace, and being shaped as a segment of a circle to form for the product in the calcining-f'iu'nace a discharge-passage between the chord b of the segment and the axial outlet 1) of the said calcining-furnace, as 7 5 shown in Fig. 3, and described in the abovementioned patent. The iron throat a has connected to its water-jacket near its bottom a pipe, a communicating, as shown, with the bottom of a tank or reservoir, 13, to contain spent liquor, the said iron throat also having connected to its water-jacket near its top a pipe, 0,, extended into the evaporating-chamber A, the said pipe (1 being shown as extended to near the rear wall of the said evap- 8 5 crating-chamber. The spent liquor containing the chemicals to be recovered flows from the tank B through the pipe a into the waterjacket of the iron throat, fromwhich it passes through the pipe ainto the evaporating-cham- 0 her, it falling upon a tray, 5 and thence upon a second tray, 1), arranged zigzag to cause the liquor to pass over alargeevaporating surface, thesaid liquor descending from the tray b upon the bottom of the evaporatingchamber. As 5 theliquor circulates around the water-jacketed iron throat,it is heated, and the iron of the said throat is cooled sufficiently to prevent it from being burned out.

The liquid issuing from the pipe a is heated 10o on its passage around the iron throat from its water-jacket, so that it readily yields up its water as it flows through the chamber A, thereby hastening the evaporation of the said liquid, so that when it reaches the bottom of the said evaporatingchamber it is substantially of a sirupy consistency.

The sirupy liquid on the bottom of the evaporating-chamber is fed forward from its rear end toward the discharge or outlet 0 of the said chamber by means of screw-conveyers c, driven by a belt, (not shown,) but which is passed about pulleys 0 at one end of the said screw-conveyers outsidetheevaporating-chamber.

The discharge or outlet passage 0 is'controlled by a valve or gate, (not show-n,) in substantiallythe same manner as in the patent-referred to.

The sirupy liquid fed into the rotary chamberA is calcined therein; and in order to prevent the soda or other chemical salts from adhering to the inner walls of the said calciningfurnace an agitating device is located therein.

The agitation device is herein shown as a screw-conveyer or worm, d, which is independent of the calcining-chamber and is free to move therein.

The screw-conveyer or worm d normally rests upon the bottom of the calcining-furnace, and as the latter is rotated the said screw-conveyer or worm is carried up on one revolution to a certain distance, when it falls back again.

The screw-conveyer or worm serves to out off or detach the soda or chemical salt adhering to the inner wall of the calcining-furnace, the said screW-conveyer or worm at the same time feeding the soda or other chemical salt in the furnace forward toward the outlet, the said soda or other chemical salt passing from the calcining-furnace between the chord b and axial outlet 1) and into a suitable receptacle (not shown) located beneath the said discharge or outlet; or the said soda may be discharged directly upon the floor.

The soda or other chemical salt in the calcining-furnace is freed from organic matter, which is burned off by the products of combustion from the furnace A, they passing through the calcining and the evaporating furnaces to the chimney. (Not shown.)

Instead of the screw-conveyer or worm d, we may employ any other agitating or detaching device, such, for instance, as a harrow provided with teeth to scrape the adhering salt from the walls of the furnace;

The combustion-furnace may be made stationary or movable with respect to the calcining-furnace, as desired.

As shown in Figs. 2 and 3, the chord b is made in two parts, forming an angle between them to enable the water leg or throat to be more clearly shown; but in practice the chord will preferably consist of but a single straight line or part.

We claim 1. In an apparatus for recovering chemicals from the spent liquors of pulp-digesters, the

3. In an apparatus forrecovering chemicals I from the spentliquors of pulp-digesters, a rotary calcining-furnace, a combustionfurnace provided with an iron throat having a surrounding water-jacket and extended into the calcining-furnace, and a tank, B, connected to the said jacketed throat, combined with an evaporating chamber, also connected with the saidjacketed throat, the spentliquors being circulated around and heated in the jacketed throat before entering the evaporating-chamber, substantially as described.

4.. I In an apparatus for recovering chemicals from the spent liquors of pulp-digesters, a rotary calciningfurnace, and a combustion-furnace provided with a water-jacketed iron throat extended into the calcining-furnace, combined with an evaporatingchamber provided with screw-conveyerslocated near the bottom thereof to feed the chemicals forward toward the calcining-furnace, substantially as described.

5. In an apparatus for recovering chemicals from the spent liquors of pulp-digesters, a rotary calciningfurnace, an independent agitat ing device located therein, and a combustionfurnace provided with an iron throat extended into the calcining-furnace, and having a surroundingjacket, combined with an evaporating-chamber provided with screw-conveyers located near the bottom thereof to feed the chemicals forward toward the calcining-furnace, substantially as described.

ICC

IIO

6. In an apparatus for recovering chemicals from the spent liquors of pulp digesters, the combination, with a rotary calcining-furnace, of a combustion-furnace provided with a metallic throat extended into the'rotary calcining-fnrnace,said throat being surrounded with a hollow jacket adapted to contain a fluid, as and for the purpose specified. v

In testimony whereof we have signed our names to this specification in the two subscribing witnesses.

JOHN E. WARREN. FRANCIS A. OLOUDMAN.

Witnesses:

FRED. S. VERRILL, WV. E. AYER.

presence of