US1693983A - Apparatus for boiling cellulose - Google Patents

Description

Dec. 4, 1928.

. 1,693,983 (2. HANGLEIITER ET AL APPARATUS FOR BOILING CELLULOSE Filed Aug. 10, 1925 Fig.1.

/n ven tor-s- Patented Dec. 4, 1928.

UNITED STATES PATENT, OFFICE.

- CARL HANGLEITER, OF' MANNHEIM-WALDHOF, AND .AJJOLF SCHNEIDER, OF KEL- HEIM-ON-THE-DANUBE, GERMANY, ASSIGNORS TO THE FIRM: ZELLSTOFFFABRIK WALDHOF, OF MAN NHEIM-WALDHOF, GERMANY, A CORPORATION OF GERMANY.

APPARATUS FOR BOILING GELLULOSE.

Application filed August 10, 1925, Serial No. 49,488, and in Germany August 26, 1924.

Our invention relates to improvements in apparatus for boiling cellulose, and more particularly in apparatus of the type shown and described in our copending application, Se-

, rial Number 549,112, filed April 3, 1922' As has been described in the said application cellulose boilers are provided with means for regenerating gases or vapors, such as sulfurous acid, and waste heat, such means consisting of a pluralityof pipes adapted to be connected with the top parts of the boilers and having a suitable liquid such as fresh liquor circulating therethrough, the said liquor taking up the gases and vapors escaping from the boilers and transmitting the same to a suitable storage receptacle. lVe have found that when connecting the said pipes with the boilers the operation of the system is frequently interfered with by liquid blows caused at the part where the said pipes are connected with the conduits for transmitting the gas or vapor thereto. Further, the pressure of the said storage receptacle reacts on the liquid circulated through the said pipes so as to interfere with the proper movement of the liquid. In some cases the fresh liquor is liable to flow into the boiler when the pressure within the said boiler has been reduced to a certain extent. Finally the said pressure within the storage receptacle, which is gradually increased in the course of the operation by the increasing temperature of the fresh liquor, reacts on the liquor and gas flowing through the said pipes and on the gas confined within the boilers. The object of the improvements is to provide a system in which the said objections are obviated, and with this object in View we construct the said pipes for removing the gas or vapor from the boilers in the form of an injector or a plurality of injectors causing a vacuum within a vacuum chamber or chambers, and connecting the boilers with the said'vacuum chamber or chambers, the said pipe or pipes including a pump for supplying the liquor to the injector under pressure.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawing, in which the same reference characters have been used in all the views to indicate corresponding parts. 7 In said drawing,

Fig. 1, is a diagrammatical elevation showing our improved system, and

Fig. 2, is a detail sectional View showing the injectors, boilers, a storage receptacle and other parts of the system.

I In the example shown in the drawingfour improved system comprises a series of cellulose boilers A, B, Z, a storage receptacle 1 4 for fresh sulfit liquor, a pipe 12 connected with the bottom part of the said receptacle and having two branches 4 a=nd5 connected with suitable mixing members f and f disposed within the storage receptacle 14. The pipe 12 includes a pump '11 and a regulating valve 16, and the pipes 4 and 5 include pumps d and (Z and regulating valves 17 and 18. By means of the said pumps and -regulating valves'the desired pressure difference isproduced within the different parts of the pipes 12 and 4, 5. Between the pumps d and d and the mixing members f and f1? check valves 6 and e? are provided, which prevent any reaction of the pressure within the receptacle 14 on the liquor flowing through the pipes 4 and 5. Each of the boilers is connected with the pipes 4 and 5 through conduits a a 6 b and 2 2 the said conduits including valves a, a 7), -6 and z, 2

As appears more particularly from Fig. 2 the pipes 4 and 5 include injectors c and 0 respectively, and in the example shown in the said figure. the suction chamber of each inj ector communicates with one of the conduits a a 6 b and 2 2 But we wish it to be understood that'our invention is not limited to a construction in which each of the said conduits is connected to a suction chamber of its own.

In the operation of the system the waste gas or vapor and heat from the boilers A, B,.

Z are regenerated by opening the valves a, I

a, b", b and a, 2 and starting the operation of the pumps 11 and d", d Thereby the fresh sulfit liquor from the storage receptacle 14 is made toflow in the direction of the arrow ac first through the pipe 12 and thereafter through the branch pipes 4, 5. lVhen flowing through the injectors 0*, 0

.the pressure of the liquor is transformed into Velocity, thus creating a vacuum within the vacuum chambers of the injectors. Thereby the vapor and gas are drawn from the boilers and transmitted into the storage receptacle 14, where they are mixed to the water by means of the members 7, F, the said members being for example in the form of forami nated pipes, or in the form of pipes having nozzles at their delivery ends. It will be understood that after flowing through the first injector the velocity of the liquor is again transformed into pressure, and it is transformed into velocity again when flowing through the next injector.

It .appears therefore that the waste gases and the heat from the boilers are stored Within the storage receptacle 14. 'Insome cases we provide means in connection with the storage receptacle for rapidly removing a large volume of steam by reducing the pres- In the operation of the system the pumps d? and (Z have thefunction to return the liquor into the receptacle 14 and thus to assisttake the fresh liquor from the place where it is manufactured and pass the same into a receptacle such as 14 without taking the same from the said receptacle and again circulating the same through the pipes. Also in such cases there is no reaction of the pressure within the storage receptacle on the liquor and gas within the pipes 4 and 5 and on the gas within the boilers A, B, Z.

While in describing the invention reference has been made to a particular example embodying the same we wish it to be understood that our invention is not limited to the construction shown in the drawing, and that various changes may be made in the general arrangement of theapp'aratus and the construction of its parts Without departing from the invention. We claim:

1'. In a system for completely and rapidly relieving the pressure in cellulose boilers and regenerating the waste heat and vapors, a boiler, an immediate connection between the waste gas-pipes and the liquor-pipes such that an injector is formed by which the hot waste gases are drawn out of the boiler without cooling them, a pump for passing the, fresh liquor under pressure through the said in jector, a closed storage-receptacle from which the liquor is taken by the pump and into which it is fed back after having passed the injector, and a check-valve between said injector and storage-receptacle.

2. In a system for completely and rapidly relieving the pressure in cellulose boilers and regenerating the waste heat and Vapors, a

boiler, an immediate connection between the waste gas-pipes and the liquor'pipes such that an injector is formed by which the hot waste gases are drawn out of the boiler without cooling them directly into a closed liquor storage-receptacle, a pump between the storage-receptacle and injector for passing liquor under pressure through the said injector, and

a second pump between the injector and the storage-receptacle for feeding back the liquor into the said receptacle.

In testimony whereof we hereunto aflix o'ur signatures.

CARL HANGLEITER. ADOLF SCHNEIDER.

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