US1959866A

US1959866A - Boiler with furnace wall tubes

Info

Publication number: US1959866A
Application number: US355712A
Authority: US
Inventors: David S Jacobus
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1929-04-17
Filing date: 1929-04-17
Publication date: 1934-05-22
Anticipated expiration: 1951-05-22

Description

May 22, 1934. D. s. JACOBUS 5986 BOILER WITH FURNACE WALL TUBES Filed April 1'7, 1929 2 Sheets-Sheet 1 ENVEN OR W %A% R N EY 2 May 22, 1934" D. s. JACOBUS BOILER WITH FURNAC EWALL TUBES 2 Sheets-Sheet 2 Filed April 17, 1929 2 INVENTOR W BY I ATTORNEYJ Patented May 22, 1934 1,959,866 BOILER WITH FURNACE WALL TUBES David S. J acobus,

Montclair, N. 1., assignor to The Babcock & Wilcox Company, Bayonne,

N. J.,' a corporation of New Application April 17,

This invention relates to a closely spaced vertically disposed water vided with. wall tubes which water is circulated and corresponding Claims.

boiler that is proroof tubes through by means of a circulat- 5 ing pump from a steam and water separator. The

feed water for the economizer where steam may then through slag screen tubes from which it, together with the steam generated, enters the steam and water separator.

The invention will be under scription in connection drawings, in which Fig. through an illustrative em tion taken is a partial tion taken a section taken along 4 is a side wall tubes tion through the headers taken along the line 5 tical section on an enl line 6-6 of Fig. 7; Fig. taken along the line 7-'7 of Fig.6; Fig. 3 is a sec-v tion taken with along the line plan View along the line 2--2 the line view partly broken and headers; Fig.

and

'Zisa along the line 8-8 9 is a diagrammatic side view of the wall tubes and headers.

In the drawings, reference c the furnace of a boiler that is with vertically disposed with horizontally disposed the roof tubes that provided with one or more .A flue 3 extendshorizont the upper gases that A bank of slag screen horizontal tubes in so on to the uppermo pipe 12 1e header 10 lie close together.

water boiler is forced through an be generated and stood from the dethe accompanying a vertical section bodiment of the inven- 1-1 of Fig. 2; Fig. 2 and a partial horizontal secof Fig. 1; Fig. 3 is 3-3 of Fig. 5; Fig. away showing the 5 is a vertical secbetween the tubes -5 of Fig. 4; Fig. 6 is a verarged scale taken along the horizontal section of Fig. 1; and Fig. showing a portion haracter 1 indicates lined on the sides tubes and along water The furnace 1 is burners 2 for fuel. ally some distance from portion of the furnace 1 and thence downwardly to a conduit or outlet 4 for the waste pass to the stack. The conduit 4 may be provided with a damper 5.

tubes portion of the flue the The headers -tubes 11,

t header passes through 6 is located in the 3 and a hopper 6 lower side of this portion of '7 that may be a steama superheater 8 are located n of the flue 3.

9 leads from a feed pump lowermost header 10 of the of the economizer ove the other and are conso that the water upper header and An outlet ads from the uppermost economizer to header 13 locate d in the horizontal Jersey 1929, Serial No. 355,712

portion of flue 3 and extending longitudinally thereof. A row of tubes 14 extends across the flue 3 and connects the header 13 on one'side to a header 15 on the other side, these tubes being preferably suspended in the form of a catenary. A similar row of tubes leads from the header 15 across the flue 3 to a header below the header 13 and so on back and forth to the lowermost header 13' from which an outlet pipe 16 for the mixture of steam and water leads to the steam and water separator 17. The steam and water separator is provided with a safety valve 18 and a steam pipe 19 leads from the upper portion of the separator 17 to the inlet header of the superheater 8. A valved drain pipe or blowofi pipe 1'7 may be connected to the lower portion or water space of the steam and water separator 1'7.

A pipe 20 leads from the lower portion or water space of the steam and Water separator 17 to the circulating pump 21. The outlet pipe 22 leads from the pump 21 and is provided with branches 22 that lead to a header 23 along the front of the furnace and also to headers 25 along opposite sides of the furnace and from these headers 25 connections 22" lead to a header 24 along the rear of the furnace, these headers being horizontally disposed and located at the lower edges of the furnace walls. Rows of water wall tubes 26, 2'7 and 28 lead upwardly from the

headers

23, 24 and 25 to corresponding

upper headers

29, ,30 and 31 respectively.

A tube 32 leads from near one end of the upper header 29 to the end of an upper horizontal header 33 along one side of the furnace. Roof tubes 34 extend across the upper end of the furnace from the header 33 to a corresponding header 33 on the other side of the furnace. A tube 35 leads from the header 30 and tubes 36 lead from the headers 31 and one of the headers 33 to the tube 37, which in turn leads to the steam and water separator 17.

Figs. 3, 4 and 5 show how the side wall tubes and the roof tubes are bent into loops at the corners to enable the main portions of the tubes to contact with each other along the walls. The water flows from a lower header 25 through the row of tubes 28 to the upper header 31, flowing through groups which are shown as having seven tubes connected in series in these figures, although a different number may be used. A tube 28 leads from the header 25 to a position near the header 31 and is bent in a loop 40. The tube then extends downwardly parallel with and near the first branch to similar loops 40 near the header 25 and so on back and forth until a desired number of return loops are provided, whereupon the tube enters the header 31 as shown at 42. By providing the loops 40 the straight portions of the tubes can be brought substantially into contact with each other to cover the entire areas of the walls, and by making the loops 40 at right angles to the wall formed by the tubes sufiicient spaces are left between the loops 40 to accommodate similar loops of the roof tubes 34 that are connected to the headers 33, as most clearly indicated near the upper portions of Figs. 3, 4-. and 5.

The manner in which the tubes are held in alignment is shown in Figs. 5, 6 and 7. Vertical metallic buck stays 43 are provided along the outside of the furnace and horizontal cross memhere 44 and 45 are attached to the same at intervals. Plates 46, bent to form hooks, are riveted to the cross members 44 and 45 and retain cross rods 17 of circular cross section. The ends of wires 48 are fusion welded to the tubes 28 and the other ends are carried around the cross rod 47 and twisted to draw the tubes toward the cross rod. Aligning and spacing tile 49 are in stalled between the tubes 28 and a heat insulating cross piece 50 rests upon the cross member 45 and bears against the channel shaped cross member 44.

The tubes 28 may be welded together along the straight portions of their lengths, as indicated at 51, and plastic refractory material may be placed against the outside of the tubes with plastic heat insulating material applied to the refractory layer.

The operation is as follows:

Feed water is forced through the pipe 9 into the lowermost header 10 of the economizer, thence through the U-tubes to the uppermost header 10'. The economizer may be provided with a sufficient amount of heating surface to cause some of the water to be evaporated. The water or mixture of steam and water passes from the uppermost header 10 of the economizer through the pipe 12 into the upper header 13, then through the upper row of tubes 14 to the upper header 15, then back and forth through the rows of tubes 14, and headers 13 and 15 across the flue 3, and out through the pipe 16 to the separator 17. The circulating pump 21 removes the water from the lower portion of the separator 17 and forces it through the pipe 22 and branches into the

lower headers

23, 24 and 25, from which the water passes through the rows of tubes 26, 2'7 and 28 into the

upper headers

29, 30 and 31. The steam and water from the header 30 passes through the

pipes

35 and 37 to the separator 17. The steam and water passes from the header 29 through the tube 32 to one of the headers 33 and roof tubes 34 to the other header 33 and thence to the sepa- Lesasee rator 17. Steam and water passes from the upper headers 31 through the pipes 36 and 37 to the steam and Water separator 17.

The steam passes from the upper portion of the steam and water separator 17 through the pipe 19 into the superheater 8 and thence into the steam main. The lower portion of the separator 17 is provided with the valved drain pipe or blowofi 17 so that the water in which impurities have become concentrated may be with-- drawn from the steam and water separator.

I claim:

1. A boiler having in combination a plurality of tubes forming a water wall, supporting mechanism for said wall including a buckstay parallel to said tubes, a transverse supporting member mounted on said buckstay, spacing tile positioned between said member and said tubes and engaging said tubes and tensioning flexible means connected to said member for holding said tubes in engagement with said spacing tile.

2. A steam boiler having in combination a combustion chamber, an outlet flue leading from said chamber in a substantially horizontal direction for the heating gases, steam genearting wall tubes located in said combustion chamber, a superheater located in said outlet flue, and a group of tubes positoned in said flue between said combustion chamber and said superheater, the tubes of said group being so spaced as to form a slag screen, and a slag disposal hopper located in said flue below said slag screen.

3. A water tube Wall including a length of tubing bended into several parallel runs lying adjacent each other in the same plane and with the connecting loops at-opposite ends of the runs disposed in planes transverse to the aforesaid plane of the wall, and means for rigidly connecting adjacent runs.

l. A Water tube furnace comprising adjacent water tube walls, each wall including a length of tubing bended into several parallel closely adjacent runs lying in the same plane and with the loops at the opposite ends of the runs disposed in planes transverse to the aforesaid plane of the wall, the walls being disposed in such relation to each other that the loops of adjacent walls are alternately interfitted to form a closure at the juncture of the walls.

5. A furnace comprising adjacent fluid cooled walls, each wall having several parallel closely adjacent tube portions lying in the same plane and connected by loops disposed in planes at an angle to the aforesaid plane of the wall, the tubes on said adjacent walls being disposed in such re- 1;

lation to each other that the loops thereof are in substantially axial alignment.

DAVID S. JACOBUS.

eenririeme er eennnerieri.

@etent Ne. 51 959 May 22, 11934..

J DAVED s. ineees.

it is herehy eertiiied that error appears in the printed specification of the above nhered patent requiring correction as ioiiows: Page 2, line 94, claim 7. strike out the word "tensioningfi and line 100, claim 2, for "genearting" read generating; and that the said Letters Patent should be read with these eorreetions rherein that the same may conform to the record of the case in the Fateni iiiee.

signed and sealed this 5th day of February, A. D. 1935.

I Leslie Frazer @eni) Acting Commissioner of Patenta