US1979884A

US1979884A - Steam boiler and its furnace

Info

Publication number: US1979884A
Application number: US365816A
Authority: US
Inventors: David S Jacobus
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1929-05-25
Filing date: 1929-05-25
Publication date: 1934-11-06
Anticipated expiration: 1951-11-06

Description

1934- D. s. JACOBUS STEAM BOILER AND ITS FURNACE 2 SheeEs-Sheet 1 Filed May 25, 1929 H .HHIIIIIIIIHHIIIIHIHHHHUHHIHHHI I .INVENTOR 4 H QQn I W v mi w ,4 ATTORNEY;

Nov. 6, 1934.. D. s. JACOBUS STEAM BOILER AND ITS FURNACE 2 Sheets-Sheet 2 Filed May 25. 1929 K\ INVENTOR f t; MW

ATTORNEY- atentecl Nov. 6, 1934 UNITED STATES OFFIE STEAM BOILER AND ll'llS NAME! Application May 25, 1929, Serial No. 365,816

10 Claims.

My invention will best be understood by reference to the accompanying drawings, in which I have illustrated a preferred embodiment thereof and in which Fig. 1 is a Sectional view through a steam boiler and its furnace embodying my invention, and Fig. 2 is a front view thereof with a portion of the casing removed.

Like reference characters indicate like parts throughout the drawings.

Referring now to the drawings, 10 is an upper transverse steam and water drum, and 11 are inclined water tubes preferably comprising an upper bank 111 and a lower bank 112. In the embodiment illustrated, the lower bank 112 comprises three rows of tubes extending transversely of the boiler, the tubes of the three rows being located one directly above the other and directly below the tubes of the row which comes above them, so that there are four, rows in which the tubes are unstaggered. For every tube in the lowermost row there are therefore three tubes which come directly above it in the same vertical plane. The uppermost tubes of the upper bank are staggered. The arrangement of the tubes with those which come nearest the fire directly over each other provides an emcient slag screen and prevents the trouble that would be experienced through the accumulation of slag between the tubes if all of the tubes were staggered in the same way as in the upper part of the upper bank.

The ends of the tubes 111 of the upper bank are connected to downtake and

uptake headers

12 and 13, respectively, and the lower and upper ends of the tubes of the lower bank 112 are connected to downtake and

uptake headers

121 and 131, respectively, the

headers

12 and 121 being connected by nipples 14, while the

headers

13 and 131 are connected by nipples 15. The upper ends of the headers 13 are connected by circulators 16 to the steam and water drum 10. The headers 12 are connected to the drum 10 by nipplesl'7 which enter the upper ends of the headers 12, alternate nipples preferably being bent away from each other as illustrated in Fig. 1 and entering the drum in rows spaced circumferentially thereof.

The furnace is indicated at 18 the front walls of which are indicated at 19 which are provided with water wall tubes 20, while the rear furnace wall is indicated at 21, the same being cooled by water tubes 22. The upper ends of the tubes 20 are connected to a transverse header 23, while the upper ends of the tubes 22 are connected to a transverse header 24. A plurality of riser tubes 25 are connected to the header 23 and uniformly spaced therealong, and are located between the

uptake headers

13 and 131 and the front casing 26. The upper ends of the riser tubes 25 are preferably. connected to a transverse header 27 which is, in turn, connected to the steam and water drum by a row of tubes 28.

Riser tubes 251 also connect the transverse header 24 directly to the steam and water drum 10, the tubes preferably being provided with extensions 252 which extend upwardly into the drum 10. A portion of the riser tubes 251 is located between the

downtake headers

12 and 121 and the rear casing 29.

Downcomer tubes 30 connect the steam and water drum 10 to lower headers which are not illustrated in the drawings, and to which the wall :0

tubes

20 and 22 are connected. Circulating

tubes

31 and 32 are connected at their upper ends to the

transverse headers

23 and 24, respectively, while their lower ends are connected to headers not illustrated in the drawings. Water wall tubes 33 for one of the side walls are also indicated in dotted lines in Fig. 1, and are connected at their upper ends to'a transverse header 34, the header 34, in turn, being connected by riser tubes 35 to, the steam and water drum 10.

A superheater indicated generally at 36 is located above the upper bank of tubes 111 and comprises an inlet header 37 which is connected by tubes 38 to the steam space of the steam and water drum 1 0 and an outlet header 39, the headers 37 and 39 being connected preferably by a plurality of rows of U-shaped tubes 40, the lowermost of which are supported on piers 41 which are, in turn, supported on the inclined water tubes. The tubes of the superheater are maintained in spaced relation by suitable cross plates 42.

In the embodiment illustrated, a baffle 43 is laid on the uppermost row of tubes of the bank 111, and a baffie 44 extends upwardly from the bafile 43 to the header 39. The space between the headers 37 and 39 is preferably sealed by suitable plates 45.

The roof of the boiler is indicated at 46. A separate header 4'7 is provided to which a limited 100 number of the tubes 33 at one end are connected, the header 47 preferably being connected to the steam and water drum 10 by a tube 48.

The headers 131 are provided with handholes 49 which are located between the riser tubes 25, as shown in Fig. 2, and through which the tubes of the lower bank 112 may be removed and replaced without disturbing the riser tubes. The lowermost row of tubes of the upper bank 111, may also be removed and replaced without dis- 110 are connected to the

transverse headers

23 and 24,'respectively, serve to distribute the water rising through the

wall tubes

20 and 22 better than would be the case if a single riser tube were'connected to the end of the

transverse headers

23 and 24. Where there is only a single riser tube,

. there is a tendency for more water to flow upwardly through some of the wall tubes than the others because of the frictional resistance in the header itself. Placing the

riser tubes

25 and 251 along the

headers

23 and 24, serves to distribute the water more evenly, therefore, in the wall tubes than would otherwise be the case.

I claim:

1. In a steam boiler and its furnace, a steam and water drum. water wall tubes associated with a furnace wall, a first transverse header to which the upper ends of said water wall tubes are connected, a plurality of riser tubes connected to and spaced along said header and extending upwardly therefrom, a second transverse header substantially co-extensive with said first transverse header to which the upper ends of said riser tubes are connected in horizontally spaced relation, and circulating tubes connecting said second transverse header to said steam and water drum.

2. In a steam boiler and its furnace, a circulatory system comprising a steam and water drum. uptake and downtake headers connected thereto and horizontally inclined water tubes connected to said headers, water wall tubes associated with the front furnace wall, a transverse header to which the upperends of said water wall tubes are connected, riser tubes connectedto and spaced along said header and extending upwardly from said header in front of said uptake headers, connections leading from the upper ends of said riser tubes to said steam and water drum, the parts being constructed and arranged to permit removal of the lowermost rows of said horizontally inclined tubes between said riser tubes.

3. In a steam boiler and its furnace, a steam and water drum, a boiler casing, water wall tubes associated with a furnace wall, a first transverse header to which the upper ends of said water wall tubes are connected, a plurality of riser tubes connected to and spaced along said header and exsaid water wall tubes are connected, riser tubes spaced along and extending upwardly from said header between one of said sets of headers and said boiler casing and connections leading from the upper ends of said riser tubes to said steam and water drum.

5. In a steam boiler and its furnace, a boiler rsraeea casing, a circulatory system comprising a steam and water drum, sets'of uptake and downtake headers connected thereto and horizontally inclined water tubes connected to said headers, vertically extending water well tubes associated with a furnace wall below one of said sets of headers, a horizontal transversely extending header to which the upper ends of said water wall tubes are connected, riser tubes uniformly spaced along and extending upwardly from said header between one of said sets of headers and said boiler casing, and connections leading from the upper ends of said riser tubes to said steam and water drum.

6. In a steam boiler and its furnace, a boiler casing, a circulatory system comprising a steam and water drum, uptake and downtake headers connected thereto and horizontally inclined water tubes connected to said headers, water wall tubes associated with the front furnace wall, a transverse header to which the upper ends of said water wall tubes are connected, riser tubes spaced along and extending upwardly from. said header between said uptake headers and said boiler casing, an upper header to which the upper ends of said riser tubes are connected, and tubes connecting said upper header to said steam and water drum.

'7. In a steam boiler and its furnace, a boiler casing, a boiler circulatory system comprising a steam and water drum, uptake and downtake headers connected thereto and horizontally inclined water tubes connected to said headers, said inclined water tubes comprising an upper bank and a lower bank, water wall tubes associated with a furnace wall, a transverse header to which the upper ends of said water wall tubes are connected with tubes spaced along and extending upwardly from said header between one of said sets of headers andsaid boiler casing, and connections leading from the upper ends of said riser tubes to said steam and water drum, the headers for said lower bank of inclined tubes being provided with hand-holes located between said riser tubes and through which the tubes of said lower bank may be inserted or removed.

8. In a boiler installation, the combination of a steam boiler having uptake and downtake headers, inclined boiler tubes connecting said headers, and a steam and water drum communlcably connected to said headers, a boiler casing having a wall spaced from the uptake headers of the boiler, a furnace having steam evaporating tubes at a wall thereof, downcomer tubes for leading water from the boiler to said wall tubes, and upcomer tubes for leading steam from said wall tubes to the boiler, said tubes being located in substantial part between the uptake headers of the boiler and the adjacent wall of the casing structure.

9. In a steam boiler and its furnace, a boiler casing, a circulatory system comprising a steam and water drum, sets of uptake and downtake headers connected thereto and horizontally inclined water tubes connected to said sets of headers, a row of uniformly spaced vertically extending water tubes associated with a furnace wall below one of said sets of headers, a horizontal transversely extending header connected to the upper ends of said wall tubes, and a series of tubular riser connections uniformly spaced along said header and extending upwardly therefrom between the superposed set of headers and said boiler casing and thence laterally to said steam and water drum.

extending header connected to the upper ends of said wall tubes, and a series of tubular riser connections of substantially equal length uniformly spaced along said header and extending upwardly therefrom between the superposed set of headers and said boiler casing and thence laterally to said steam and water drum.

mm s. JACOBUS.