US2458798A - Baffle for watertube boilers - Google Patents

Description

Jan. 11, 1949. G; P. REINTJES BAFFLE FOR WATER TUBE BOILERS Filed Nov. 16, 1944 Bn entor @mit Jan. 11, 1949; G. P; REINTJl-:s

y BAFFLE FOR WATER TUBE BOILERS Filed NOV. 16, 1944 4 Sheets-Sheet 3 Jail 11, 1949 G. P. RElNTJEs BAFFLE FOR WATER TUBE BOILERS- 4 Sheets-Sheet 4 Filed NOV. 16, 1944 Patented Jan. 11, 1949 UNITED STATES PATENT OFFICE 2,458,798 BAFFLE FOR WATERTUBE BOILERS George P. Reintjes, Kansas City, Mo. Application November 16, 1944, Serial No. 563,709

(Cl. 11G-98) 3 Claims.

This invention relates to improvements in the emciency of water tube boilers by a system of bailles whereby it is possible to transfer more heat into the tubes than with other baille systems with which I am familiar.

In a straight tube boiler, one or more steam and water drums usually overly and parallel the tubes, the end of said tubes being ordinarily cone nected to headers, which, in turn, are connected to the steam drums. It has been found that those tubes directly underlying the steam drum are most efcient in the production of steam since they are straighter and offer less resistance to flow; consequently to improve boiler heating capacity, it will be evident that these tubes should be exposed to as much radiant heat as possible and that they should also be heated to the greatest extent possible by convection. -in object of the invention, therefore, is to provide a combination of horizontal and vertical bailles of such nature that the center tubes, that is, the tubes lying between vertical planes coinciding with the diameter of the boiler drum, shall be exposed to cross flow of the combustion gases, said cross flow having been found to be more eilicient in transferring heat than ilow paralleling the tubes.

A further object of the invention is to increase the overall efficiency by proportioning the passes to the volume of gases, decreasing the area of the passes as the gases cool so as to maintain a constant or greater velocity, and effecting turning or deflection of the gases to as great extent as possible, in an unrestricted open chamber above the tube bank and in front of the curtain wall, which materially lessens frictional resistance and accommodates more gases or the same volume of gases with less stack height.

With the general objects named in view, and others as will hereinafter appear, the invention consists in certain novel and useful features of construction and combination of parts as hereinafter described and claimed; and in ord-er that it may be fully understood, reference is to be had to the accompanying drawings, in which:

Figure 1 is a central vertical section taken through a water tube boiler of standarddesign, equipped with the bailles of the invention.

Figure 2 is a section on the line II-II of Figure 1.

Figure 3 is a section on the line III-III of Figure 1.

Figure 4 is a section on the line IV-IV cf Figure 1.

Figure 5 is a section on the line V-V of Figure 1.

Figure 6 is a cross section through a slightly modified form of baille construction in which the vertical bailles forming the main or cross-dow pass are arranged in Venturi tube fashion.

Figure 'I is a cross section through the same general type of furnace having a steam superheater above the tube bank.

Figure 8 illustrates a wider combustion cham ber in which there are two yor more main or crossilow passes.

, Figure 9 is a perspective vi-ew of the furnace with the boiler tubes and walls largely broken away to more clearly disclose the bailles.

In the said drawings, where like reference characters identify corresponding parts in all of the figures, l is the steam drum of any conventional boiler, said drum being connected to front and rear headers 2 and 3, which are interconnected by boiler tube bank 3a, the boiler as a whole being supported on any suitable setting 4 and providing a furnace combustion chamber 5. The furnace is constructed with a curtain wall 6 separating the gas and turn chamber l from the stack or outlet end of the furnace 8, and a hor zontal baill-e extending from the lower edge of the cross baffle to the back wall of the outlet chamber and from side wall to side wall of said chamber to close direct communication between the outlet chamber and the fire box.

In the present embodiment of the invention, a horizontal lower baille 9 is arranged above the second row of boiler tubes, said baille extending from the rear to the front end of the furnace. This horizontal baille 9 is cut-away, preferably equal distance from the center line of the furnace from a point vertically below the curtain wall to the front end of the furnace, to provide a main cross-flow pass l0 for the combustion gases leading entirely through the bank of tubes to the turn chamber l above the same and below the boiler drum. The gases are preferably confined to the central portion of the tube bank by a pair of upwardly extending baffles Il, running longitudinally of the furnace shown in the present embodiment as being inclined toward each other, their lower ends being in juxtaposition with the inner edges of the cut-away portion of the horizontal baille 9.

The gases are prevented from flowing into the rear section of the bank yof tubes by means of a vertical cross baille l2 extending from baffle to baille Il. This construction prevents by-passing of the llame and combustion gases to the rear or stack end of the furnace.

In order to force the gases rearwardly in counterow relation and to maintain as great a wiping action on the tubes as is possible, a pair of upper horizontal baies I3 extend from the 0pposite ends of the longitudinal baiiles H to the side walls of the furnace. Thus, the ballles I3 in conjunction with the lower bales 9, the side walls of the furnace and the longitudinally extending ba'fles Si, produce a pair of counterow passes lli leading into the economizer or rear section of the tube bank back of the curtain wall 6 and bale i2.

In the construction shown in Figure 6, vertical baffles i5 are arranged in Venturi-tube Ifashion combustion gases being forced through the center part or" the same by a pair of vertically extending walls 2li super-imposed on the upper ends o'f the vertical main cross-pass baiiles 2l.

It will be apparent that various modifications may be employed when the bafe system is used in wide furnaces. For example, in Figure 8 a construction is shown in which a pair of main cross-flow passes 22 and `23 communicate with one common .longitudinal flow pass .24.

From the above description and drawings, it will be apparent that l have produced a construction embodying all of the features set forth as desirable, and while I have illustrated vand .described the preferred construction, it is Vto be understood that 1 reserve the right'to all changes within the spirit and scope of the appended claims.

I claim:

l. The combination in a water tube boiler having iront and rear headers connected 'by a bank of water tubes in vertically and horizontally spaced rows, a roof spaced above said tubes, a re box below the tubes, .a bridge wall dividing the space above the tubes into a gas turn chamber and a gas outlet chamber, and side and end walls enclosing the tube bank and fire box, Van outlet connection for the gas outlet chamber, of a plurality of spaced longitudinal bailles extending longitudinally of and upwardly through the tube bank from a point below the bridge wall to one end wall of the furnace, a cross baiile extending vupwardly'through the tube bankffrom a point below the bridge wall to the lower edge of the bridge wall to close communication between the space between adjacent longitudinal bailles and the outlet chamber, horizontal lbaiiles extending from the side walls oi the furnace to the lower edges of adjacent longitudinal baiiles to conne upward gas ow to the space between said longitudinal baiiles, and a horizontal baiiie extending from the lower edge of the cross baille to `the back wall of the outlet chamber and from side wall to side wall of said chamber to close direct communication between the outlet chamber and the fire box.

2. The combination in a water tube boiler having front and rear headers connected by a bank lthrough .the Etube bank from a point below the bridge wall to one end wall of the furnace, a cross baille extending upwardly through the tube bank from a point below the bridge wall to the lower edge of the bridge wall to close communication between the space between said pair of 'longitudinal baiiies and with the outlet chamber,

horizontal bailies extending from the side walls of the furnace to the lower edges of the -longitudinal baies to conine upward gas iiow to the space between said longitudinal bailles, and a horizontal y baffle extending from the lower edge of the cross ba'flle to `the back wall of the voutlet chamber and from side wall to side wall oi said chamber to close direct communication betw-een the outlet chamber and the fire box.

S. The combination in a water tube boiler having iront and rear headers connected by a bank of `water tubes in vertically and horizontally spaced rows, a roof spaced above said tubes, a iire .box Abelow the tubes, a bridge wall dividing the space above the tubes into a gas turn chamber and a gas outlet chamber, side and end walls enclosing the tube bank, ire box and outlet chamber, and an outlet connection for the gas outlet chamber, of a pair of spaced longitudinal bailes extending longitudinally of and upwardly through the `tube bank from a point below the bridge .wall to one end wall of the furnace, a

`cross baffleextending upwardly through the tube bank from a point below the bridge wall to the lower vedge of the bridge wall to close communication between vthe space between said pair of longitudinal baiiies and the outlet chamber, horizontal 'baiiies extending from the side walls of the furnace 'to the lower edges oi the longitudinal vbaiiies `to confine upward gas flow to the area be- REFERENCES `Cl'lll)v The following references are of record in the nie Vof this patent:

UNITED STATES PATENTS Number Name Date Re. 18,326 Bailey Jan. 12, 1932 544,882 Chapman Aug. 20, 1895 897,322 Summers Sept. 1, 1903 983,170 Sewall Jan. 31, 1911 1,124,405 ,Pennell i Jan. 12, 1915 1,175,223 Black Mar. le, 1916 1,699,864 "VonPagenhardt Jan. 22, 1929

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