US1380373A - Dbier-heatihg system - Google Patents

Description

W. B. FULTON.

DRIER HEATING SYSTEM.

APPLICATION FILED OCT-1, 1919.

1,380,373, Pa't entedJuhe 7,1! 21.

W/zZ/AM 5. F01 722M Witness: Inventor "'1 W S w,

Attorney.

45 tively high-pressure steam to these driers:

wnmivi in. semen, or riinnnn'rown, OHIO.

nninn-nnnrnve SYSTEM.

T all whom it may concern:

' the following is a specification.

This invention pertains to improvements in systems for heating driers. It is especially applicable to rotary drying cylinders employed in drying the web in. the

process of paper making, and I have chosen such a paper machine drier for illustration.

The invention will be readily understood from the following description taken in connection with the accompanying drawing in which i 1 Figure 1 is a diametrical section of a .part of an exemplifying cylindrical paper drier: and y r Fig. 2 an end elevation of two series of such driers shown in connection with a system exemplifying my present invention. In the drawing, referring to Fig. 1:-' '1, indicates the shell of an vordinary rotary paper machine drier: v

2, the steam inlet thereto: and 2 3, the water outlet therefrom.

In theordinary construction, exemplified in Fig. 1, the heating steam enters and the water of condensation leaves at: the same end of the drier, which is quite usual, and my present improvements, when employed in connection with paper machine driers, V

contemplate either that the steam may enter at one end of the drier and the water of condensation leave at its other end, or that the entry of steam and the departure of condensation water may take place at the same end of the drier.

Proceeding with the drawing 4:, indicates a secondary group of the driers, the group being illustrated as containing two driers:

5, a supply-pipe for conveying compara- 6, a discharge-pipe for conveying steam at lowered pressure, as well as the water of con densation'from these driers:

7 a receiver:

8, a pipe placing the upper portion of the receiver in connection with the discharge 6 of the secondary driers:

9, a primary group of driers, the group being illustrated as containing two driers:

Y Specification of Letters Patent.

' primary driers Patented June 7, 1921.

Application filed October 1, 1919. Serial No. 327,783. a

10, supply-pipe placing the upper part of the receiver in communication with the primary driers 9: a 3:

11, a discharge-pipe connected with the primary driers '9 for conveying from them their contents consisting of vapor at reduced or zeropressure, as well as air and the water of condensatlon:

12, a suction device, illustrated as a pump:

13, a pipe placing the suction device in connection with the discharge pipe 11 of the 14, a condenser, which be of either 1- D-S A E AT NT-on on..- 3

the surface or jet type, disposed in pipe 13:

1 5, steam traps, of any usual character, CllSPOSGCl' in the'individual discharge pipes of the primary driers 9:

15 by-pass pipes around the steam traps 15 15- a valve in each of these by-pass pipes;

V 16, an assumed water-level in the re ce1ver: I

17, a float-valve disposed within and controlled by the level of water in the receiver and adaptedto be opened by the rising of the float:

18, a pipe placing the'fioat valved? in communication with the suctiondevice: 12:

19, a pipe placing the upper portion of the receiver in connection-withthe suction device 12:

20, a check-valve in pipe 19 opening away from the receiver 2]., a stop-valve in pipe 19: 22, the stem of this stop-valve:

23,-a diaphragm connected with this stem:

paratively high pressure. 7, This steai'n heats the driers 4 and, by parting with heat, be-

comes reduced in pressure and, along with the water condensed in these driers, goesthrough pipe 8 to the receiver 7, water of condensation, entrained inthe steam discharged from these driers, falling to the base ofthe where its accumulation will eventually cause it to stand at the level 16. p

The steam at reduced pressure, leaves the receiver through pipe '10 and goes to the primary driers 9 and efiects the heatin of those driers, but to a lower temperature t an seconds mary driers 9 parts with heat andbecon es reduced in prfissure and thege dneli: g s- =cha throng ipes 11 an 13, t 1s- 1 hiiugwitfidnwn by the suction device 12, the discharge consisting of the water at eonden mtion and air, and ssibly some lsteam the motion device using, y,. ;muum-intheprimary less. The mmtmps 15 open, as usual, in the presence of excessive water and form partill sells betm the primary driers and itho-ismtiondeviee and prevent the overnvherlmingpf the-suction device with steam from the driers. The condenser itserves -im eondenaingflle discharge firom the pritnary diners, when those dricrs discharge receiver 7 is provided with a baflie 7, as showman itsinlet firompi-pe Band its tmflst to'pipe 10, this haflie preventing she direct low of steam between the two.

pipes and causing the water entrained in the discharged pipe 8 to seek-the lower :wtorfthe Receiver. The water in thebese of thomeim stands normally at the level 16, and when the level of water rises than 1th. 'fleotwpene valve 17 and theeuction desicewithdmm water receiver.

1 Diaphragm 28 has its upper surfacesubtartBe-presaure-ofwthe steam in the receiver and holds valve 21 normallycloaed, pgnsinst of action of weight 25, ipe 19 being without nine under such con 'tions. If, however, the pressure in primary tails or is lost mtirely, as a result of their own "action, then the ,mceiverm y-possibly cease to withdraw the water and air, from the secondary driers. In such case the lowering of the pressure ir the receiver relieves the pressure over diaphragm 23;, whereupon valve 21 opens and permit the suction device 12 to draw dimdalyupon the receiver through pipe 19, same as if .the primary driers were not in day a e suc no ice 12, iii-acting through p300 Hand 19, finds, in the weight of the 2 ve pro in check-valve 20, a slight resistance whereby the superior BIICHDQJsQXBDtQd on pipe 13 and the primarydrier z9. v v

Bye'pas ns l5 enablef we suction device to he always flitting on the primary driers 9 so as to remove steam, water of condensation, :and'air from those driersreven while the traps are not indicating that water is 1. The steam in the prirs, while am; 19 m to be removed from the drier-s, and the valves 15 are to be so regulated that the suction devicewill always draw sufficiently on the primary I have referred to the grou of driers 9 as primary and the group 0 driers 4 as secondary, in view of the fact that in the drying of paper, for instance, it is usual to first subject thgzpaper to drying at the lower drying heat and subsequently subject it to dryingahthe higher drying heat, the paper in such case passing the driers in at the driers' 9 and te.su

While I- have illustrated my system as comprising but two greupsofdriers, each grou containing two driers, each group may contain any-desired and propel-number of driers, there maybe as many groups as desiredQ-z and valve 21, with their accessries, -being disposed between each two groups.

It is to understood that, even in the absence ofthe-traps '15, the valves 15* serve in introducing a restriction between" the iiriers f9 and the suction device, restriction servingto prevent theoverwlwlniing of the suction device by steam fi-om the suction device to'withdraw from the driers the water of condensation and airjin quantities as limited by the restriction introduced in the pipes between the driers and the suction device. i Y

1. A driersysteiucomprising, agr'oup of secondar diners, apipefor s Iyingsteam thereto, a fieceiver, a pipe, aoi "the receiver in communication wi h sai secondary driersr, a group Tof primary drier-s, a pipe clog the receiver in communication with the primary driers, Motion device, a suctionpipe glad the suction deyice in communication wi h the primary drier-s, a pipe placing the suctionudeviee vin communication with the base oivthe receiver, and a float valvewithin the Receiver on said last mentioned andr having its float adapted to open the valve by file isc of accumulated ter in the receiver, combined substantially as set fulfill. 1

2. A drier system secondary drieraa pipe sapptyangsteam thereto, a receiver, a We placing; the receiver n communication with said. secondary drlers, a groupyilprimary thaws, a

' ing, a group of the direction of arrow 26, the paper being thus subjected to its primary dryingaction baeqaent drying at the secondary driers 4.

pipe placing the receiver in communication with the primary, a suction device, a suction-pipe placing-thesuetiomdevice in communication with the primary drier-s, a pipe placing the suction device in communication with the base of the receiver, a valve 1 in said last-mentioned pipe arranged to open by the-rise of the level of water in" the receiver, andsteam jtrapsdispos'ed between V j the primarydriers and the suction' device,

combined 'substantiallyas setforth.

. 3.;A drier system comprising,*agroupof secondary driers, a pipe for-supplying steam thereto r es-w p p p here- *ceiver in communication with said secondary clr1ers,-a'group of pr mary dr1ers,'a

pipe placing the receiver inycommunication with the primary driers, a SllCiilOIl devrce, a

cation with the base of' the'receivenand a condenser dISPOSBCl lIl the discharge pipe between the primary driers and'the' suction device, combined substantially asset forth.

4. A drier system comprising, a group of secondary driers, a pipe for supplying steam thereto, a receiver, a pipe placing the receiver in communication with said secondary driers, a group of primary driers, a

pipe placing the receiver in communication.

with the primary driers, a suction device, a suction-pipe placing the suction device in communication with the primary driers, a pipe placing the suction device in communication with the base of the receiver, a valve in said last-mentioned pipe arranged to open by the rise of the level of waterin the receiver, steam traps disposed between the primary driers and the suction device, bypass pipes at such steam traps, and regulating valves in such by-pass pipes, combined substantially as set forth.

5. A drier system comprising, a group of secondary driers, a pipe for supplying steam thereto, a receiver, a pipe placing the receiver in communication with said secondary driers, a group of primary driers, a pipe placing the receiverin communication with the primary driers, a suction device, a suction-pipe placing the suction-device in communication with the primary driers, a pipe placing the suction device in communication with the base of the receiver,a float-valve in said last-mentioned pipe and arranged to be opened by the rising of the level of the accumulated water in the receiver, a pipe placing the suction-device in communication with the upper portion of the receiver, a normally closed valve in such pipe, a diaphragm connected with the stem of such valve and having one of its surfaces subjected to the pressure in the receiver, and a weight adapted to open such valve when the pressure over the diaphragm is reduced,

combined substantially as set forth.

6. A drier system comprising, a group of secondary driers, a pipe for supplying steam thereto, a receiver, a pipe placing the re ceiver in communication with said secondary driers, a group of primary driers, a plpe placing" the receiver in communication l with the" primary "drlers, a suction dev1ce, -a; su'ction-pipe placing the suction-device in communication with'the primary drlers, aplpe placing the suction "device communrcar 'tion with thebas'e of the receiver, fa fioat- "valve in said last-mentionedpipe and farrangedto be openedby thei rising of the level of the accumulated waterin "the -receiv'er, a pipe placing thesuction-device-in" communication with the upper portion 'of the receiver, a normally closed valve in such pipe, a diaphragm connected with the stem of such valve and having one o'f-its surfaces pressure of the diaphragm'is reduced, and

check-valve in said pipe placing the suction device in communication with the upper part of the receiver and adapted to furmary driers, a suction device, a pipe placin the suction device in communication w1th the base of the receiver, a valveinsaid last-mentioned pipe arranged to open by the rise of the level of water in the receiver,

[subjected to the pressureiin the'receiverfa means adapted to" open such valve when the the receiver in communication with the pripipes placing the primary driers in com--.

munication with the. suction device, and restriction devices in said last mentioned pipes to limit the flow from-the driers to the suction device, combined substantially as set forth.

8. A drier system comprising primaryand secondary groups of driers, meansffor supplying steam tosald secondarygroup,

'means for .withdrawing steam, a1r and water of condensation from said secondary group, means for separating the water from said steam and air, means for conducting the separated steam and air to said primary group of driers, a common suction device for exhausting said primary group of driers and for withdrawing water from said separatingmeans and means for connecting said. suction device with the steam spacein said separating means when the pressure in said primary group of driers falls to a predetermined value; 7 r r 9. A drier system comprising primary and secondary groups of driers, means for supplying steam to said secondary group,

means for withdrawing steam, air and water of condensation fromsaid secondary group, means for separating the water from said steam and air, means for conducting the sep arated steam and air to said primary group of driers, and a common suction device for

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