US1982378A - Steam jet pump - Google Patents

Description

Nov. 27, 1934. J. GARVIE STEAM JET PUMP Filed Sept. 9, 1952 2 Sheets-Sheet l INVENTOR. Jn N56 Gmzv/r.v PER. Hrromzv.

J. GARVIE STEAM JET PUMP Nov. 27, 1934.

Patented Nov. 27, 1934 UNITED STATES 1,982,378 STEAM JET PUMP James Garvie, Bedford Park, London, England Application September 9, 1932,

Serial No. 632,465

In Great Britain October 20, 1931 3 Claims. (01. 230-95) My present invention relates to improved means for eliminating smoke and, improving thermal efficiency of boilers. Heretofore various efforts have been made to eliminate smoke and improve thermal efliciency by employing steam and air blast apparatus in which a nozzle connected to a source of steam supply projects ajet of steam into a Venturi nozzle and is located within a tubular jacket or sleeve provided with air admission apertures. It is found that with apparatus of this type as at present in use there is a tendency to use it as little as possible because of the excessive noise set up by the action of thesteam jet within a tubular casing which generally communicates with a pipe like air supply conduit the whole construction of which is sirable volume of sound. Also itis foundthat certain boilers have different requirements as to the relative value of steamand air supply and generally the rate of supply of steam is adjusted to suit the requirements of the boiler as far as possible but the regulation of the airsupply is not adjusted with respect to each jet so that the desired result is not always obtained. The object of my invention is to provide a construction of blast apparatus for furnaces which will not have these disadvantages. p

In v order that this invention may be clearly understood and readily carried into effect two sheets of drawings are appended hereto illustrating embodiments thereof and wherein,

Fig, 1 is a longitudinal sectional view of one of the jets. I

Fig. 2 is a side elevation the device shown in Fig. 1. V

Fig. 3 is a detail sectional view to a larger scale showing the device for regulating the quantity of steam flowing to the jet.

Fig. 4 is a partsectional coupled pair of injectors. H i

Fig. 5 is a part sectional front elevation view showing a modified arrangement of smoke eliminators which are particularly adaptableto boilers fitted with mechanical stokers, and 7 Fig.6 is a vertical sectional View of acomplete assembly of one of the devices shown in Fig, 5. j

Referring to the drawings, the blast apparatus comprises an air conduit 1 open at one end 2 and closed by a plate 3 at the other and having directed laterally from it one or more chambers 4 each accommodating a steam jet 5 co-axially aligned with a Venturi tube 6 directed towards the furnace, the open end of the air supply conduit having disposed around it a bell shaped cap 7 and having provided within it one ormore bafiles 8 for the purpose of producing a form of silencer, each'said jet .5having disposed about it a cone 9 provided with one or more air supply apertures 10 each adjustable in effective area of opening.

In carrying the preferred embodiment of my view of the nozzle of plan view showing a such as to producean unde-- .or directly aligned witheach other; .thesesaid plates canbe secured. in .one or more screws 12 passed through'the appropriate part of the air, conduit intothe within the box and supported within a sleeve 14' fitted in a concentric tubular boss 15 practice the air conduit can as shown in Fig. 4 be composed of a numberof flanged cast or drawn steel or iron tubeswith flanges ii at their ends which are bolted together to providean air conduit of the required axial dimension, each fiangedunitof this conduit having cast integral with it or welded to it a chamber invention into i in the form of a cylindrical box theaxis of which is at right angles relatively to the axis of the air conduit 1. By constructing the. air conduit in this manner a large amount of noise is eliminated as comparedwith existing apparatus in which the air conduit is made of sheet'metal. The plate 3 is bolted against the outer flange at such end and the other ,end of the conduit iscomposed of a tube la from, which the box 4 and, the outer flange 11 are omitted. Fitted over itsouter end so to have an annular and an axial clearance therefrom is the bell shaped cast metal 'capFl so that, the air entering saidcap has to reverse its direction, of travel to enter the. air conduit. Arranged diagonallyacross the interior of the airconduit at its inlet end is a bafiie 8 in the form of a plate provided with a plurality of perforations as shown so that the combination of this perforated plate and annular cap provides a silencer. If required more than oneof these diagonal plates can. be employed, their faces being their apertures stepped relative to each other Each of position by periphery ofeach plate. The bell shaped cap can be secured in position by one or more radial screws 13.

Each of the said. laterallydirected boxes 4 formed with the air conduit 1 accommodates one of the steam jets 5preferably co-axially mounted concentric formed integralwith the outer end ofv the box 4,

this concentric boss being normally closed by a movable cover cap, 16 which can be hinged at one end on a screw threaded into .the outer end of the boxiand engaged at its other end by means of a hook shaped part over another like screw. The body of the steam. jet 5 is bored axially to receive an adjustable needle 17 in well known manner and the body 5 is apertured between its periphery and its axis to provide a supplementary air passage 18. Air can pass through into an annular space 19 surrounding the'support of the adjustable needle. and from thence through the passage 18 formed along the said body parallel with, itsaxis. This supplementary air can be admitted by opening the closure plate hinged at the outer end of the box. The inner end of the sleeve 14 accommodating the jet is formed with a conical part 20 terminating in a nozzle 21 parallel with and contiguous to each other and I fb'urning and by such an arrangement a cheap" the nozzle which drives the steam and air into r s to the jet body by a radial, pipe 25, threaded into the body 5 andcarried through an. opening; pro-'- end to a conduit 23 directed intothe required zone of the furnace. -.'I'his conduit mayhave a fiared downwardly inclined nozzle 24 detachably.

fitted onits free end as this part is subject to and easy replacement is effected. Also the said flared nozzle can be composed of a metal or alloy of high heat resisting quality. Steam is admitted vided for such purpose in the side of the said box 4, and for the purpose of regulating; the supply 1 of air the cone shaped front end 20 of the said sleeveis' formed with a number of-longitudinal slots 26 and has-disposed about it the Crim an throttle member i l-slotted: as at. 10 toicorrespond with the slots.26;in-'theconical part of the sleeve .andform'ed with'a short cylindrical-portion 9'a at its inner end fitted over the correspondingly shaped part-of the said sleeve, a set screw 27 being passed through afl'circumferential slot in said cylindrical portion into the said sleeve so that a fine adjustment can be effected with each I-jet.

.When, as wouldnormally be the practice a number of je'ts'and' their associated parts are provided a steam supply pipe 28 common to-.all of the jet pipes 25 is provided connected to the pipes 25 by suitable Ts and elbows in-well known Emannen. r, 1 1 When the invention-is applied to .a'boiler fitted with mechanical s'tokers, the smoke eliminators can consist of anumber of individual devices not .connectedto a common air conduit 1. Such'an arrangement. is shown in Figs. 5 and 6 in which .eachzbox 4 is formed with lugs4a by means of which it is. attached to the boiler and plate. Steam'pipes 25' arecarriedto the jetsin'side' the .boxes 4 and each-box is formed an upstanding air conduit portion lbonwhich is bolted the tubular: member. 1a in the same manner. as previously described. In this arrangement; the bell members. 7 are' 'located above] the steam inljectors, the parts inthis embodiment correspond- -ing-to those in'the previously described embodiment bearing thesame referenc'e numerals The 'bell' shaped enclosing cap" necessitates ithe a'i'r entering the. inlet conduit following the sinuous course; and as the mouth of the bell shaped cap .isin juxt'apositi'onto the said box the induced air :is ,toa certain extent pre-heated by-beingdrawn overthe said box before entering the air inlet conduit, itbeing: understood that the said box iWill acquire a QCBItEJ-ILIdBEIQG-Of heat by reason ,ofthe location therein of the steamjet. 1

The construction of; device shown in "Figs. -5 and 6 is intended :to. supply' steam and 1 air to a single nozzle and for -this ipurpose it is preferred .to provide zwith-"theisteam supply pipe means [sage can;.be.adjusted oneformed with a different ,the. furnace to be so constructed that it sets up a turbulence action materially increasing thermal efficiency and the diminution of smoke, A suitable method of obtaining this turbulence is to fit in the mouth. of the nozzle a number of radial webs3l"which are inclined relatively to the axis of. thenozzle so as to impart a spin or whirling to the ejected steamand air. I g I The shape and direction of the; nozzle 24- is preferably so arrangedthat-the delivery of the column of air crosses -over 'the' delivery of air from adjacentnozzles and sets up turbulence in the-furnace, and the air is-pre-heated by-coming in contact with thenozales, allof whichincreases theefiiciency of combustion.

What-I claim is:

1 In a steam jet pump for deliveri and air into a furnace for eliminating smoke, a box an air inlet conduit extending laterally from one side of said box, a steam jet accommodated in said'box, an outlet in one end' of i said box opposite which is located the emission end ofsaid jetya Ve nturi tube fitted in said outlet,'-a'n outer openinlet'endof said air conduit, anda substan- .-tial1y'-bellshaped capfitted over and'aboutthe said open inlet end of said conduit so" as to" be annularly spaced-therefromso-as' to provide an annular air "passageabout the said air conduit, k

a baflie in said air conduitj'said' bell [shaped cap having an open inlet located betweenthe'ends of the' air conduit; a steamand air emission "tube being fitted to theouter end ofsaidfVenturitube. I 2. In-a steamjet p'ump for delivering "steam and air into a furnace an airconduit open at one end and closed at the other, achamber intersecting said "conduit and projecting'laterally therefrombetween its ends,- a steam 'jet in said chamber; a- Venturi tube fitted'in one end of and directed from-said end of thejchamber towards the furnace, 'saidjetbeing co-axial with said'venturi tube, a substantially bell shaped cap disposedabout and spaced from the open end of said air supply conduit; and a baflle inside fs'aid I air supply conduit, the bell shaped cap surroundingathesaid airsu'pply'c'onduit' to provide an annular airspace, asteam andair' eniission tube beingfitted to the'oute'r end of said Venr ei. 31 In a steam jet 'pump for delivering {steam and air into a furnace'an'air conduit o ener;

v steam oneen'd and closed at the otheri chambers inter secting said conduit and [projecting laterally therjefrombetween its ends, steam jets in said chambers-and'Venturi tubesin one of said-cha n'- bersfdirected fromsaid chambers towards the furnace, said jets being coaxial with said Veri- 'turi 'tube s, a 'substantiallybell shaped cap disposed about and spaced from the open end of a,

.said air supply t a baffle in Said airsmj;

ply conduit near its open end, the said bell shaped ca'p surrounding the said air supply conduitto fprovide a substantially annular air space,;and i air and steam'emission tubes fitted to the outer 1 .ends of said Venturi tubes. a I JAMES GARYIE.

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