US1725798A - Steam boiler - Google Patents

Description

g- 1929. H. c. HEATON STEAM BOILER Filed July 10, 1924 m ad/Q m W i Patented Aug. 27, 1929..

UNITED STATES v r 1,725,793 PATENT OFFICE.

HERMAN C. HEATON, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE BABCOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

STEAM. BOILER.

Application filed Jul 10,

My invention particularly relates to steam boiler installations of the type employing finely divided fuel, and will be best understood from the following description taken with the annexed drawing which'shows more or less diagrammatically a verticalsection of an installation illustrative of my invention.

In said drawing, 10 denotes a steam and water drum of a boiler of a modified cross drum type having banks of inclined water tubes 11 and 12, the ends of which are connected by the usual downtake headers 13, 13 and uptake headers 14, 14. For purposes which will be apparent, the tube banks 11 and 12 are located a considerable distance below the drum 10 and are connected thereto by means of uptake nipples 15, horizontal tubes 16 and downtake nipples 17, thereby defining a. chamber in which the combustion of pulverized coal orother finely divided fuel may take place. Steam returned to drum 10 is let off through pipe 18 (the connection of which to the drum is not shown) and passes through a superheater 19 located between the tube banks 11 and 12 and leaves the installation through pipe 20.

For the purpose of more or less completely surroundin the combustion chamber with heat absorbing surfaces, I provide at each side of the furnace a vertical row of tubes 21, each of which rows is connected to a pair of head- ' ers 22, 23, uptake header 22 having a connection with drum 10 through conduit 24 (shown in dotted lines and as extending parallel to and outside of header 22), and nipples 25, and downtake header 23 being joined-to the drum through a downtake 26, conduit 27 shown similarly to conduit 24 and nipples 28. Similar connections join the vertical bank oftubes constituting the opposite side wall, with drum 10. In the installation shown, a pow dered fuel burner 29 is located in the lower portion of the combustion chamber and is directed upwardly so that the combustion gases are caused to make a 180 turn.

The gases of combustion after making a single pass over the tube banks 11 and 12 are caused to pass over an economizer 30 directly beneath tube bank 12, and thence through an air heater 31. Below air heater 31 I have provided a washer 32 for abstracting the remaining portions of the sensible heat from the gases. A. suction fan 33 is used to aid the circulation through the system. Any suitable liquid, such as water or relatively concen- 1924. Serial No. 725,153.

trated sulphuric acid, may be used as the scrubbing medium in washer 32. Feed water is admitted through pipe 34, 2-way valve 35, economizer 30 and pipe 36 connecting said economizer with the drum 10. I

It will be seen from the foregoing, that the combustion chamber is surrounded on the top by circulating tubes 16, on the front and rear ends by downtake and uptake nipples 17 and 15, respectively, and on either side by'a row of tubes 21, and is thus completely surrounded by water tubes; In this manner the intense heat produced in the furnace chamber by the combustion of the finely divided fuel is ade quately utilized. In addition such an arrangement has the important advantage that no masonry is exposed to the flame temperatures, thereby avoiding troubles incident to the use of exposed refractories, which present a considerable problem inpowdered fuel furnaces.

Moreover, it has been proposed to cut down the size of and even to omit entirely the steam and water drums, in boilers for use with extremely high pressures. In such boilers there is but little reserve capacity steam and should the feed water supply be stopped immediately after shutting off the burner, highly heated masonry if present would continue to produce steam in adjacent boiler heating surface, whereby such heating surface might be severely damaged. By the use of my improved arrangement however, this disadvantage is avoided and the feed water supply may be stopped at the same time the burner is shut off. Furthermore, the feed water supply may be shut off at the same time that the fuel supply is stopped without running the risk of damaging the tubes. It will be apparent that the cutting down of the drum sizes or their elimination, is of particular importance in the use of high boiler pressures.

Locating the combustion chamber above the boiler tubes permits a convenient arrangement of the subsequent heat absorbing units, such as the feed water and air heaters and the washer, all of which may be placed in vertical alignment, as shown.

Various changes will occur to those skilled in the art. 'For exam lo, the burner or burners 29 may be place near the top of the combustion chamber and the flames directed downwardly in a progressively widening path. It is to be understood that the above arrangement is illustrative only and that various changes may be made without departing from the spirit of my invention.

1 claim:

1. A boiler having a bank of inclined water tubes, uptake and downtake water chambers connecting the ends of said tubes, an upper steam and water drum above and spaced from said bank, a row of vertically disposed tubes connecting the tops of said downtake chambers with said drum, a row of horizontally disposed tubes connected to said drum, a row of vertically disposed tubes connecting the tops of the uptake water chambers with the ends of the tubes of said horizontal row, a row of vertically disposed tubes at each side of said row of horizontally disposed tubes and connections with saidvertically disposed tubes and said drum affording a circulation through said vertically disposed tubes, said bank and said rows of tubes forming a combustion chamber, and a finely-divided fuel supplying mechanism having an upwardly directed nozzle projecting through one of said rows of vertically disposed tubes and projecting the fuel upwardly at one side of said chamber, the gas outlet for the chamber being positioned beneath said bank.

2. A boiler having a bank of inclined water tubes, uptake and downtake water chambers connecting the ends of said tubes, an upper steam and water drum above and spaced from said bank, a row of vertically disposed tubes connecting the tops of said downtake chambers with said drum, a row of connections from the uptake water chambers to said drum, comprising tubes extending upwardly from said uptake water chambers, a row of vertically disposed tubes at each edge of said row of connections in planes at an angle to said row of connections, connections with said vertically disposed tubes and said drum afiording circulation through said verticall disosed tubes, said bank and said rows 0 tubes orming a combustion chamber, and a finelydivided fuel supplying mechanism having an upwardly directed nozzle projecting through one of said rows of vertically disposed tubes and projecting the fuel upwardly at one side of said chamber, the gas "outlet for the said chamber being positioned beneath said bank.

3. Aboiler having a bank of inclined water tubes, uptake and downtake water chambers connecting the ends of said tubes, an upper steam and water drum above and spaced from said bank, a row of vertcally disposed tubes connecting the tops of said downtake chambers with said drum, a row of horizontally disposed tubes connected to said drum, a row of vertically disposed tubes connecting the tops of the uptake water chambers with the ends of the tubes of said horizontal row, a row of vertically disposed tubes at each side of said row of horizontally disposed tubes and connections with said vertically disposed tubes and said drum affording a circulation through said vertically disposed tubes, said bank and said rows of tubes forming a combustion chamber, and a finely-divided fuel supplying mechanism for projecting finelydivided fuel into said combustion chamber, the gas outlet from said chamber being positioned beneath said bank.

4. A boiler having a bank of inclined water tubes, uptake and downtake water chambers connecting the ends of said tubes, an upper steam and water drum above and spaced from said bank, a row of vertically disposed tubes connecting the tops of said downtake chambers with said drum, a row of connections from the uptake water chambers to said drum, comprising tubes extending upwardly from said uptake chambers, a row of tubes ateach edge of said row of connections in planes at an angle to said row of connections, connections with said last named rows of tubes and said drum affording a circulation through said last named tubes, said bank and said rows of tubes forming a combustion chamber, and a finely-divided fuel supplying mechanism for projecting finely-divided fuel into said combustion chamber, the gas outlet for said chamber being positioned beneath said bank.

HERMAN C. HEATON.

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