US1643973A - Steam-circulating system for driers - Google Patents

Description

oa. 4 192 A j l 7 J. o.,wo'oDsoME STEAM CIRCULA'IINC:A SYSTEM FOR DRIERS .FnedfecQ 16.4 192s 15x/'EDR y Jol/11n 0. Woof/60mg I. ."l .mw l;

13. A similar, though preferably longer, inner conical shell 17 is adapted to be fitted within the other end of said outer shell 10 with its flanged end 13 similarly positioned within a recess formed in the upper fianged end 11. Said conical shell 17A also terminates in a reduced end having an orifice-19 spaced' apart a short distance from the orifice 16 and directly in line therewith. Lugs 20- formed on the inside of the outer shell 10 serve to position'the removable conical shells 14 and 17. Said shells 14 and 17 are made removable in order that shells having the required size of orifice 16 and 19 may be lquickly installed Itoy meet the demands of the particular drying system on which the jet compressor is to be pressor 7 yexcept that its inner shells 25 and 26 are provided with relatively different sized orifices 27 and 28 respectively. The circulator 24 is also provided with a side aperture 29 opposite the , orifices 27 and 28 and threaded to receive a pipe 30 which con- Vnects said circulator to a side orilice 31 in a nozzle separator32. Said nozzle separator 32 is positioned in a .drain line 33 leading Vfrom the `tting 4 to a drain header 34. Said nozzle separator 32 comprises an outer shell 35 provided with Hang-es 36 at each end adapted to be secured to {ianged fittings 37 on the piping 33. A single inner shell 38 extends from the upper end of said outer shell 35ste a point somewhat below the side orifice 31. Said shell 38 is conical shaped and provided with a lower restricted orifice 39. The function of the nozzle separator 32,4 as is obvious, `is to separate the` water from the uncondensed steam, the latter ,being aspirated through the pipe 30 by means of the suction effect created within the Venturi circulator 24. The condensate being, of course, of greater density is delivered through the orifice 39 at a point below the side aperture 31 and therefore tends to continuey in its downward path through the piping 33 into the drain header 34. The re- -sult islan economy in steam, since litttle if any uncondensed steam is allowed to pass out into the drain header 34. f

Thev operation is substantially as follows: After the steam has passed through the j et compressor 7, it passes through the reduced orifice 27, at which lpoint its velocity. is increased and its static pressure decreased to the extent necessary to form a partial vacuumv sufiicient to draw in uncondensed steam from the nozzle separator 32 through the piping `30. The combined streams of steam then pass through the upwardly flared inner shell 26,` the velocity being thereby somewhat reduced, and through the piping 8 and the hollow trunnion 2 into the interior of the drying cylinder 1. The pressure of the V'steam within thedrying cylindercly forces the condensate formed in the drying process out through the s iphon 3 Aand the steam yt- -ting 4 into the drain line'33.. In its passage through the separator 32 the uncondensedl steam isseparated out'from the condensate as described above and the condensate. passes on into the drain header and isremoved from the system.

Itis obviousthat the sizes of thel various orifices in the Venturi fittings must be carefully calculated in order tofproduce therequired velocity vof steam to the drier with the required drop in pressure between the separator 32 and the circulator 24.l By calculations from suitable charts that may be pre'- pared showing the iiow of steam to the drier using various sized orifices, the correctsize of orifice for any particular installation of driers may be readily computed. Since the inner shells in the various Venturi fittings are according to my construction intere changeable, it is a simple matter to change the capacity yof the *systemV in 5 accordance with varying needs.

It will be understood that while I have described `my steam circulating apparatus as applied to drying systems for paper ma chines, said apparatus is equally applicable to any similar drying system,- as for instancel in the drying of textile fabrics.'

I am aware that many` changesV may be made, and numerous details of construction maybe varied through a wide range without departing from the principles of this inven- .Y

tion, and I therefore do not purpose limiting the Vpatent granted hereon, otherwise than necessitated by the prior art.

lI claim as my invention:

V1. Ina steam drying apparatus* a steam drier, a high pressure steam' line, piping connecting` said line to said drier, a jet compressor and circulator 4of the Venturi type 'in said piping, a low pressure steam supply header connected to saidjet compressor atl the constricted portion, a drain line'from said drier, a Venturi type nozzle' separator in. said drain line and a communicating conduit between said separator-land sa-id circulator to recirculate uncondensed steam from said drainline.

2. In a steam dryingapparatus, a steam drier, high and low pressuresteam lines', piping from said high pressure line to said nected to said drier, a'nozzle separator in drier, a jet compressor and a Venturi circuylator in'said piping, a drain 'header consaid drain connecting line andA communicating conduits between said separator and said circulator and between said low pressure steam line and said jet compressor.

3. In a paper drier system, a drier drum, high and 10W pressure steam lines, a jet compressor havinga restricted orifice and a side opening adjacent said orifice, said compressor being connected to said high pressure l0 line and to said drier drum, a conduit connecting said low pressure line to said side opening, a return drain line, a restriction nozzle in said return drain line, a Venturi circulator in said jet compressor line, and a communicating` conduit between said restriction nozzle and said Venturi circulator for recirculating uncondensed steam.

In testimony whereof I have hereunto subscribed my name.

JOHN O. WOODSOME.

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