US1747011A - Superheater - Google Patents

Description

H. J. KERR SUPERHEATER Feb. 11, 1930.

Filed Feb. 2, 1925 4 Sheets-Sheet l INVENTOR .WBY y W 1% W a ATTORNEY$ Feb. 11, 1930. KERR 1,747,011

SUPERHEATER Filed Feb- 2, 1925 4 Sheets-Sheet 2 unlllllll! lllllll IN VEN TOR. My. x w/ A TTORNEYS.

4 Sheets-Sheet 3 H. J. KERR SUPERHEATER Filed Feb. 2, 1925 Feb. 11

/7 4 ATTORNEYS.

Feb. 11, 1930. H, J. KERR 1,747,011

SUPERHEATER Filed Feb. 2, 1925 4 Sheets-Sheet 4 IN VEN TOR.

Patented Feb. 1 1 1930 UNITED STATES PATEN OFFICE HOWARD J. KERR, OF EL MORA, NEW JERSEY, ASSIGNOR TO THE BABCOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY SUPERJIEA'IER Application filed February 2, 1925. Serial No. 6,242.

My present invention relates to superheaters, particularly those arranged to be contacted with radiant heat, and will be best understood from, the following description and the annexed drawings, in which 1 is a sectional side elevation of a boiler showing one form of my invention; Fig. 2 is an enlarged view of a portion of Fig. 1; Fig. '3 is a section on the line 3-3 of Fig. 2- Fig. 4c is a re View similar to Fig. 3, but showing the parts in a difierent position; Fig; 5 is a horizontal section through the boiler Wali and showing a modification of the arrangement shown in Fig. 1, such section being taken on the line 5 ofFig: 7 Fig. (vis a view similar to Fig. 5, but taken on the line 6'6 of Fig. 7 and Fig. 7 isasectiontaken on the line 7-7 of Fig. 5, with the wall parts removed; Fig. 8 is a view similar to Fig. 6-, but showi-ngthe parts in a different position; Fig. 9 shows the lower portion of another form of water tubeboiler, with a modification or my invent on appliedl thereto; Fig. I0 is an enlarged side elevation are part oi Fig. 9, and Fig. 11 1s a section-of Fig; l tlxon the line li 11.

header 1'8: and the-outlet header =19, thelaiiter being conneetedvthrough the pipe 20 with the steam-and water-drumand theheader 1*8beilig c nnected-by a=r0w of tubes 21 extending across the furnace chamber to a header 22 wh-iohiissoonnectedby pipes 23 tothedrum 11'. The tubes=2lserve to increase the circulation thnough the-tubes 17 and may; also be used as slag-,screens' when powdered. fuel is burnedintheehamber 10..

lilz-willibe obviousthat the water from the drum 11 passes down throu 'h the pipes 23, the header 22, the tubes 21, tile header 18, the tubes 17, the header '19 and the connections 26 back to the drum 11, so that there is a circulationthrou-gh the tubes 17.

As will be noted best in Fig. 3, the water tubes 17 are spaced apart and the superheater tubes 15 are arranged in the rear of such spaces. Consequently the tubes 15 are con tact-ed not only the hot gases in the chamber 10, but also by the radiant heat from the burning fuel and the incandescent rear wall of the furnace chamber.

In the operation of the boiler, it is desirable at certain times,- particularly when starting up the boiler, to protect the superheater tubes from the direct radiant heat toprevent injury to the tubes, or to limit the degree of superheat, andI have provided means by Whirih this may be accomplished.

In the arrangement illustrated in Figs. 3 and 4, a" protecting member'24 is mounted on sleeves at its top and bottom on each of the tubes 17 so as to be rotatable about the axes-of the tubes 17 on which it is mounted.- As a convenient means for turning the protecting member 24: from the position-shown in Fig; 4 to the position shown in Fig. 3, in which latter position it will cut off the fiowotrad iant heat to the superheater tubes 15, I have shown the upper end of each of the protecting metribers 24 as provided with gear teeth 25 meshing with gears 26 on a shaft 27 extending out? through the boiler setting and controlled by a hand Wheel 28. WVhen the shaiit 27 is rotated, it is obvious that each of the protecting members 24 will be rotated around its r'espe'c'- tive water tube 17. p

In the arrangement shown in Figs. 5 to 8 thereis a modification of the arrangement just described, the protecting meinbers b'e'ing' arranged sothat normally they are out of contact with the hot gases and are, therefore',-1ess liable to be injured. In this arrangement, a box-like casing 29 extends through the furnace' Wall 16 and carries a pair of vertical shafts 3O rotatable through gears 31 from a shaft 32 extending out through the boiler setting and provided with suitable operating means-by which it may be turned. Between 1 is pivoted a protecting member 35 bent outwardly as shown best in Figs. 5 and 6, with the opening through the furnace wall small enough to force the members 35 to the position shown in Fig. 5 when the plates 34 are in the position shown in that figure.

On rotating the shaft 32, the plates 34 are carried in toward the furnace chamber by friction rolls 36on shafts and by gears 37 also on such shafts gearing with suitable racks cut on the sides of the plates 34. It

will be noted that the protecting members are held at an angle to each other, so that as the curved surface of the tubes 17 is contacted, these members will be turned on the pivots to the final position shown in Fig. 8, in which they stand across the spaces between the water tubes 17 to out off the radiant heat from the superheater tubes 15. When it is desired to permit the radiant heat to contact with the tubes 15, the shaft 32 is rotated in the opposite direction which will draw the plates 34 away from the furnace chamber and will bring the pivoted protecting plates 35 back to the position shown in Fig. 5, where they will be out of contact with the hot gases and with the radiant heat from the furnace.

In the arrangement shown in Figs. 9, 10 and 11, the lower water tubes 38 are spaced from the upper water tubes 39 to form a superheater chamber in which is located a superheater having inlet and outlet headers, 40, 41 connected by tubes 42. The headers 40, 41 extend through the side wall of the boiler setting in the manner illustrated as to one of them in Fig. 10, it being understood that the other header is similarly arrange-d.

. The header 41 is slidably mounted in a wall box 43 provided with a stufiing box. The outlet pipe 44 for the superheated steam is also provided with a stufling box through which the end of the header 41 extends, the end of the header being connected through a pair of spaced members with a rod 45 having a screw-thread formed on the end thereof on which there is a geared nut 46, the gear 47 of which is connected through a gear 48 on a .shaft 49 with the corresponding gear on the end of the header 40.

When the shaft 49 is rotated, therefore, it will be obvious that the headers 40 and 41 will be drawn simultaneously through the side wall of the chamber to shift the position of the tubes 42 in relation to the water tubes 38. In the position shown in Fig. 10, the staggered tubes 38 will cut oil substantially all of the radiant heat from the superheater I tubes 42 and this would be the position, for

instance, in which the tubes 42 would be located when the boiler is starting up and before any substantial amount of steam is flowing through the tubes 42. Then, when the boiler is steaming fully, the shaft 49 will be turned to shift the headers 40, 41 to bring the tubes 42 into the diagonal path between the rows of tubes 38, and consequently into position to be contacted by the radiant heat of the furnace. The tubes 42 may, of course, be located in any intermediate position to vary the amount of radiant heat with which. they are contacted.

It will be understood that the arrangements which I have shown are merely illustrative and that the embodiment of my invention may be widely varied.

I claim 1. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, and means to vary the amount of the radiant heat passing between said water tubes and reaching the superheater.

2. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to per- 4 mit radiant heat rays to pass therebetween to said superheater,- and adjustable means to cover the spaces between said water tubes, whereby the amount of the radiant heat passing to the superheater may be regulated.

3. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, adjustable means to cover the spaces between said water tubes, whereby the amount of the radiant heat passing to the superheater may be regulated, and operating means for said adjustable means operable from the exterior of the furnace.

4. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler Water tubes between said superheater and the source of heatin the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, and adjustable metal plates arranged to contact with said water tubes and cover the spaces between said water tubes, whereby the amount of the radiant heat passing to the superheater may be regulated.

5. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, an adjusting member movable at right-angles to the axes of said water tubes and a protecting member hinged to the end of said adjusting member and adapted to contact with a water tube to be swung across the space between a pair of said water tubes and in front of said superheater when said adjusting member is moved toward the water tube.

6. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, one of the furnace walls extending at the rear of said superheater and said water tubes and having a relatively narrow opening therethrough, an adjusting member extending through said opening, a protecting member hinged to the inner end of said adjusting member and arranged to contact with a water tube as said adjusting member is moved toward the water tube to swing said protecting member across the space between a pair of said water tubes and in front of said superheater.

7. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, and means cooperating with said tubes to vary the amount of the radiant heat passing between said water tubes and reaching the superheater.

8. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, and means movably associated with said tubes to vary the amount of the radiant heat passing to the superheater.

9. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, and metal plates associated with said tubes and movable to adjustably cover the spaces between said tubes, whereby the amount of the radiant heat passing to the superheater may be regulated.

10. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, in combination with means to vary the amount of the radiant heat passing between said water tubes to the superheater, said means comprising protecting members movably mounted with respect to said tubes and adapted to at least partially close the spaces therebetween.

11. In a steam boiler, a superheater arranged to be contacted normally by the radiant heat of the furnace, boiler water tubes between said superheater and the source of heat in the furnace and spaced apart to permit radiant heat rays to pass therebetween to said superheater, and means associated with said superheater and water tubes for regulating the amount of heat imparted to the superheater from the source of heat in the furnace.

HOWARD J. KERR.

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