US1680945A

US1680945A - Boiler furnace

Info

Publication number: US1680945A
Application number: US645779A
Authority: US
Inventors: William A Jones
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1923-06-16
Filing date: 1923-06-16
Publication date: 1928-08-14
Anticipated expiration: 1945-08-14

Description

w. A. JONES BOILER FURNACE Aug. 14, 192&

4 Sheets-Sheet Filed June .16, 1923 INVENTOR ,EM. ATTORNEY w. A. JONES BOILER FURNACE 4 Sheets-Sheet Filed June 16, 1925 INVENTOR.

e efw A TTORNEYS.

. w. A. JONES v BOILfiR FURNACE Filed June 16, 1923 4 Sheets-Sheet 5 l l w INVENTOR. Manama 1% 6M! M ATTORNEYS.

Aug. 14, 1928. r 1,680,945

w. A. JONES BOILER FURNACE Filed Ju ne 16, '1925' 4 Sheets-Sheet 4 Illl/ IIIIIIIIIIIIIIIIlII/IIIIIII IN VEN TOR.

M'HMQ -ATT2)RNEYS.

Patented Aug. 14, 1928.

i 1 ,680,945 UNITED STATES PATENT OFFICE.

WI LIAM A. JONES, 01" WEST ,NEW BRIGHTON, NEW YORK, ASSIGN'OR To THE B'AB- cocx & wILcox COMPANY,

JERSEY. d

Application filed June 16,

My invention relates to boiler furnaces and will be understood by reference to the accompanying drawings, in which Fig. 1 is. a sectional sideelevation of a boiler furnace embodying. my invention; Fig. 2 is a plan View of the water boxes and the connections therefor; Fig. 3 is an elevation of the parts shown in Fig.2; Fig. dis a partially vertical section through the scoker furnace chamber and showing the rear wall water box in elevation and the side water boxes in section; Fig. his a detail front View of the rear wall water box, partly in section, and on a larger scale, than shown in Fig. 4; Fig. Sis an end View ofthe box shown in Fig. 5; Fig. 7 is a sectional view on line 77 of Fig. 5; Fig. 8 is a View of a part of the rear wall water box and the rear bridge wall and shows therelation between the side water boxes and the rear water box; Fig. 9 is an end View ofthe part'shown in Fig. 8; F' lOis a sectional viewthrou h the left ski water box and blast box of t e stoker, and Fig. 11 is a sectional View of the lower member of the boiler pressure parts to which the water box connections are made. i j I Referring to the drawings, particularly Fig, l, the numeral 10 designates the furnace chamber in which is placed a blast chain grate stoker 11. 'Above the furnace is a bank 12 of water tubes which are connected at their ends to water compartments 1 3 and 14. A superheater 15 is placed above the bank of water tubes, and in the path of the first and second .passes of the gases from the furnace 10 as ey aredirected back and forth across the tubes 12 by the baffles shown.

A steam andwater drum 16 is connected with the

water compartments

13 and 14 of the tubes and is supplied with water from the economizer through which the gases pass after having passed through. the boiler. The furnace is provided with front and rear walls '18 and 19, respectively, and withside i walls 19.

e chain grate of the stoker,

OF BAYONNE, NEW JERSEY, ,A CORPORATION OF NEW BOILER FURNACE.

1923. Serial No.- 645,779.

formed by projectingthe metal of the wall of the tube outwardly, as best shown in Fig. 5. By thus forming the tube seats, a sort of dome is produced which insures against the formation of steam pockets where the ends of the pipe connections are attached to the box. That is to say, the end of the connecting pipe does not extend below the tube seat in the box, as would be the case if a plain opening were made in the box wall and the pipe inserted therein.

pipe 22 connects at one end with the box 20, and at itsother end with a flanged elbow 23. which connects with a pipe 24;. The pipe 24 is connected with'the lower forward member 25 of the boiler pressure parts, which, in turn, are connected with the downtake .water compartment 14 of the water-tubes. The

pipes

22 and 24 are placed outside of the furnace chamber and will,

therefore, be kept relatively cool and will receive no heat from the surrounding atmosphere, so that the water within these pipes will be'relatively dense and will contain substantially no steam. A second tube seat 2(iis formed in the box 20, as shown'in Fig. 5, and a bent pipe 27 connects the box 20 with the lower rear member 28 of the boiler pressure parts. The pipe 27 is inside thefurnace so that it is exposed to the heat of the furnace and the water and steam in pipe 27 will, therefore, be at a higher tempipe 27 will tend to decrease'further the density of the waterin pipe '27 and will thereby further increase'the velocity ofthe circulation, .For reasons already given, there will be no tendency to form a steam pocket at the tube seat 26.

Pipe 27 is curved, as shown in Figs. 1 to 3, preferably so asto have a reverse bend with part of thebend at right angles to the axes of the ends of the tubes. By reason of its departure from a straight line between the tube seat 30 in member 28 and tube seat 26 in box 20, particularly if bent in the manner illustrated, pipe 27 is so flexible that the lower boiler member 28 may move upward or downward, due to the expansion or contraction of the boiler pressure parts from variations in temperature, without overstraining pipe 27. The bending stress in pipe 27, which is created by this movement, will be for any given part of the pipe, directly proportional to the distance ot that part of the. pipe from the straight line between the seats 30 and 2G, and since the ends of the pipe at 26 and 30 have their axes parallel, there will be no bending stress, although there will be at these points a relaltiyely small direct longitudinal stress. This arrangement results in the greatest in the pipe occurring where it will not tend to loosen the endsof the pipe in the tube seats. It is noted that the pipe 27 lies substantially in a single plane. The above principle is employed in the connections fdrmed by pipe 22, elbow 23 and pipe 24 between tube seat 21 in box 20, and tube seat 31 in the lower forward member 25 of the boiler, and this connection is, therefore, also very flexible. This pipe connec tion does not 'lie in a single plane so that a certaintorsional flexibility is also present.

illater boxes

32 and 33 are provided in side walls 19 of the furnace chamber. The box 32 is placed in theIleftwall and the box 33 in the ri ht side wall, as viewed from the front of the "furnace. These boxes slope upwa'rd'from the front toward the rear of the boiler, so that the steam which. is formed therein will flow upward "toward the rear. The

boxes

32 and 33 pass under the bridge wall box 20 and extend, through the rear of the setting. They are provided with handholes and fittings 'therefor'at their rear ends so that they may be inspected inside throughout their length. These boxes are provided at their lower ends with pipe connections 34; for box 32, and with pipe connections 35 for the'box 33 from the lower forward boiler pressure member 25. These connectionsare exterior to the furnace and, being cool, are filled with dense water with out steam. The seat 36 on box 32 and seat 37 on the box '33 are formed in the same manner as seats 21 and26 onthe box 20. These boxes 32 and' 33 are connected by

bent pipes

38 and 39,1respectively, with the lower rear boiler pressure member 28, and are similar to pipe 27. These pipes are within the furnace and are exposed to the heat thereof, so that steam will be generated in them and the water willb'e lei-3s dense than that within pipes-34 'and'35, and the circulation will, therefore, be downward in

pipes

34 and 35, and'upward in

pipes

38 and 39 in the manner heretofore described in conneetion with the bridge wall box connections.

The box 20 is provided with handholes and fittings 40 and 41 are provided for these l-uindholes, as shown. in Fi 4. By removing these fittings it is possible to look through the box, and if it contains dirt or scale or other foreign matter, the same may be easily removed therefrom through the handholes. .A blow-oil connection 42 is provided at the lower end of the box near the bottom and provides means for draining the box and for blowing out any muddy water which it might contain. An auxiliary drain pipe (see Fig. 8) of small dian'ieter and provided with a valve is shown, and may be used when the lioil'er is in active service. The use of a large blow-oil pipe instead of the auxiliary drain pipe would tend to rob the box of such a quantity of 'ater that it might be endangered. A handhole is provided at the rear of box 32, and a similar hole is also provided at the rear of box 33 and fittings 4-3 and 4 :1, respectively, are applied to these openings. Similar handholes and fittil'lgs 46 and 4:7 are provided near the forward ends of these boxes and may be removed for permitting observation througln out the length of the boxes. Drain connections 48 and i9 are provided on the sides of these boxes near their lowerforward ends and are similar to that used on the rear wall box 20.

In Fig. 11 is illustrated the manner in which the

tubes

27, 3S and 39 pass through the drip pan 50 below the pressure part 28. This drip pan is connected to the boiler setting parts, so that there maybe relative movement between the

parts

28 and 50. An opening for each tube is providcd'in the pan 50 and a thimble 51 inserted therein, soithat the pan will not leak. The opening in the thimble 51 is large enough to permit the tube to move up and down therein. The flexible sealing plate 52 will also have suitable openings for the tube. In the boiler shown in the drawings the upper end of the uptake header ofthe boiler is supported in a fixed position. The side wall water box is also supported in a fixed )osition. lVhen the temperature of'the boiler and that of tube 39 are increased from atmospheric temperature to that of the hot water and the steam in the boiler, both the boiler part and the pipe 39 increase in length. Since the upper end of the uptake header and the side wall box 32 are fixed there must be suflicient flexibility in the pipe 3!) to accommodate the movement due to this increase in length.

Witlrtub'e 39, of the shape shown a very moderate force tending to shorten the distance between its ends causes the tube to bend the necessary'amount.

The principle employed'with the tube-34 lUU is the same as with 39. The connection 34 extends upward from the water box 32, then horizontally toward the center of the boiler, then vertically, then toward the rear to join the mud drum below the downtake headers at some distance from the side of the boiler. Here also a great portion of tube is at a considerable distance from a straight line joining the ends of the tube with the results above explained. The flexibility of tube 3a is greater than that of 39 because 34 does not lie in a single plane and considerable torsional flexibility is, therefore, present. This is also true of tube 22 and its connections.

Many changes may be made in the form and arrangement of the apparatus and the various parts thereof without departing from the spirit of my invention.

I claim: V o

1. In combination, a boiler having horizontally inclined water tubes connected by water compartments, a water back in the furnace, a drip pan connected to the furnace setting and located beneath one of the water compartments, and a pipe connecting the water back with the water compartment, said pipe extending through an opening in said drip pan and being freeto move verv tically therein, said drip pan having a thimble loosely surrounding the pipe to prevent leakage of water from the pan through the opening for the pipe.

2. In combination, a boiler, a furnace therefor, a water back of relatively small diameter in the furnace with its ends extending outside the furnace, a side Wall water box of relatively small diameter located below the water back and. extending through the frontand the back of the setting, said Water back and said water box' each being provided with a domed projection adjacent each of the ends thereof, pipes connecting each end of the water back and the water box with the boiler water spaces, said pipes being expanded into said projections, and said water back and said water box each having an opening at each end thereof, whereby they may be inspected throughout their length, and fittings for said openings.

WILLIAM A. JONES.