US1327032A - Superheater - Google Patents

Description

E. A. GEOGHEGAN.

SUFERHEATER. APPLICATION HLED NOV. 8. 1917.

Patented J an. 6, 1920.

UNITED STATES PATENT OFFICE.

EDWARD A. GEOGHEGAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO MILTON KRAEMER AND EDWARD J. TALBOTT, TRUSTEES.

SUPERHEATER.

Application filedNovember 8, 1917.

To all whom it may concern.

Be it known that I, EDWARD A. GEOGHE- GAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvementsin Superheaters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such, as will enable others skilled in the art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, andto the letters of reference marked thereon, forming part of this specification.

My invention relates to steam superheatcrs, and particularly to that type of such apparatus as are mounted in furnace settings of their own and are provided with mechanical stoking apparatus.

The object of my invention is to provide such a superheating apparatus, which, in its operation will-supply'the steam with the required degree of superheat without effecting any chemical change therein.

I accomplishthis objectby arranging a series of banks of vertically inclined steam conveying tubes in asuitable furnace setting or heating chamber, and connecting the upper and lower ends of the tubes of said several banks by means of pairs of tube headers, said-pairs of headers being so connected thatthere willbe a continuous passage through said headers and banks of tubes from the intake tothe exit therefrom.

The features of my invention are hereinafter fully set forth and pointed out, and are illustrated in the accompanying drawings in which:

Figure 1, is a side elevationof a'steam superheating appartus embodying my invention mounted in an independent furnace setting.

Fig. 2, is a sectional view showing the plan arrangement of the lower headers, and their connections.

Fig. 3, is a plan view of the upper headers and their connections.

In these drawings the lower header tubes are indicated by the numerals l to 12 inclusive; and the upper headers are indicated by the numerals 13 to 24 inclusive. The lower headers are connected in pairs by means of branch pipes, A, B, C, D, E, and F; and said branch pipes are connected in Specification of Letters Patent.

Patented Jan. 6, 1920.

Serial No. 200,919.

pairs by meansof the pipes A, C and E; -and the upper headers are connected in pairs by-means of branch pipes G, H, I, J, K and L and the branch pipes H and I are connected by means of the pipes H and the branch pipes J and K are connected by means of the pipe J; while a steam supply pipe M is connected with the branch pipe G, and a steam exit pipe N is connected with the branch pipe L.

1 As shown in Fig. 1, the lower headertubes l and 2, are connected with the upper header tubes 13 and it by means of the banks of tubes a a; the lower header tubes 3 and 4 with the upper header tubes 15 and 16 by means of banks of tubes 1) b; the lower header tubes 5 and 6 with the upper header tubes 17 and 18 by means of banks of tubes 0 c; the lower header tubes 7 and 8 with the upper header tubes 19 and 20 bymeans of banks of tubes (Z (Z; the lower header tubes 9 and 10 with the upper header tubes 21 and 22 by means of banks of tubes 6 e; and the lower header tubes 11 and 12 with the upper header tubes 23 and 24k by means of banks of tubes f f; so that steam entering the upper headers 18 and 14: through the intake pipe-M and branch G, passes downwardly through the banks of tubes a a into the lower headers l and 2; thence through the pipes A A, and B into the lower headers 3 and 4; thence upwardly through the banks of tubes Z) 6 into the upper headers 15 and 16; thence through the pipe H, H and I into the upper headers 17 and 18; thence downwardly through the banks oftube-s c 0 into the lower headers 5 and 6; thence through the pipes C, C and D into the lower headers 7 and 8; thence upwardly through the banks of tubescZ .(Z into the 11pperheaders 19 and 20; thence through the pipes ,J J and K'into the upper headers 2l and 22; thence downwardly through banks of tubes 6 6 into the lower headers 9 and 10; thence through the pipes E E and F into the lower headers 11 and 12; thence upwardly through banks of tubes 7 7 into the upper headers 23 and 2st; thence through the pipe L to the exit pipe N.

The apparatus above described is inclosed in a suitable furnace setting consisting of the rear wall 0, side walls P, front wall Q, cover arch S, bottom T, and fire back wall U. The furnace is preferably provided with a mechanical stoker mechanism Q, of any desired type, although it may be arranged for manual stoking.

The chamber back of the fire wall U is provided with transverse baffles g, h, i, and I preferably place a horizontal baffle j immediately under the upper tube headers, so that fire gases rising upwardly in front of the fire Wall U pass rearwardly over said wall and among the banks of tubes 0; a and Z) Z); thence under the lower end of the baflie g and upwardly among the banks of tubes Q0 and cl; thence over the upper end of the baflie it and downwardly among the banks of tubes (Z and e e; thence upwardly among the banks of tubes 7 7" toward the smoke exit V.

In operation saturated steam is introduced into the first pair of upper headers 13 and 14 immediately above the fire-grate Q, and passes through the super-heater apparatus as hereinbefore described, and the fire gases at their greatest heat impinge upon the banks of tubes at a which contain steam as it comes from the generator, and during its passage through the tubes a a the strata of steam contacting with the inner surface of the tubes a a by the action of heat, becomes somewhat drier than the inner portion of the column of steam within each of the tubes of the banks a a, and when the steam enters the lower headers 1 and 2, it is partially mixed by being brought into a sin gle body in each of said headers 1 and 2; and said mixing is carried a step further by uniting the steam from the two headers 1 and 2 in a single body, and again subdividit by causing it to pass through the pipes A, A and B into the lower headers 3 and 1, from whence it is again subdivided among the tubes of the banks 6 b; the stratification. of steam mentioned in the banks a a, is thus broken up and the vapor particles thoroughly intermixed during the steams passage from the banks of tubes into the headers, and from one pair of headers into the succeeding pair of headers. It will be noted also that when the steam is being acted upon by the hottest fire gas, it is the wettest, and can absorb a high degree of heat without having its chemical content disassociated and the oxygen absorbed by the metal of the tubes; and it will be noted also that as the steam passes through the successive banks of tubes, and becomes progressively drier therein, the heat of the firegas outside of the tubes becomes progres sively lower, so that the oxygen will not have been burned out of the steam; or in otherwords, it will not have been absorbed by the metal walls of the tubes, (which as is well known, have a great affinity therefor,)

thereby leaving a residue comprised almost entirely of hydrogen gas, to be delivered into the exit pipe N.

This result is obtained by breaking up the dry and moist stratas of steam in the banks of tubes as it passes from bank to bank and thoroughly intermixing the vapor particles during the passage from one bank to the next; and by reducing the heat as the dryness of the steam increases.

Having thus described my invention, and illustrated suitable apparatus for embodying the same, I do not desire to limit myself to the exact arrangement of apparatus shown and described, as it is obvious that many changes and modifications can be made therein without departing from the scope of my invention; therefore what I claim as new and desire to secure by Letters Patent is:

In an apparatus of the class described, a furnace chamber, a fire-grate therein, a firewall behind said grate, an intake returnbend header tube above said fire-grate, a series of succeeding return-bend header tubes on the plane of and behind said intake header, a fire-bafie under said headers, vertical return-bend pipe connections connecting said return-bend headers in alternate pairs, so that the last header becomes a discharge header, a series of return-bend tube headers under'the first named headers and behind said fire-wall, vertical return-bend pipe connections connecting said lower headers in alternate pairs in staggered relation to said upper headers, inclined superheater tubes connecting the first and succeeding upper headers with the first and (I EDWARD A. GEOGHEGAN.

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