US1596843A - Water-cooled-damper construction - Google Patents

Description

Aug. 17 1926.

E. J. M DONNELL WATER COOLED DAMPER CONSTRUCTION Filed Sept. 20, 1922 5 Sheets-Sheet 1 INVENTOR ,M"

Aug. 17 1926. 1,596,843

E. J. M DONNELL WATER COOLED DAMPER CONSTRUCTION Filed Sept. 20, 1922 5 Sheets-Sheet 2 INVENT R C Mw1 M Aug. 17 ,1926.

E. J. M DONNELL WATER COOLED DAMPER CONSTRUCTION 5 Sheets-Sheet 5 Filed Sept. 20, 1922 mm NM INVENTOR Cum/ 404 714W Aug. 17 1926.

E. J. M DONNELL WATER COOLED DAMPERCONSTRUCTION Filed Sept. 20', 192? 5 Sheets-Sheet 4 Patented Aug. 17, 1926.

UNITED STATES PATENT OFFICE.

EDWARD J. MODONNELL, OF PITTSBURGH, PENNSYLVANIA, ASBIGNOR TO BLAw-KN ox COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

WATER-COOLED-DAMPEB CONSTRUCTION.

Application filed September 20, 1922. Serial- No. 589,879.

Figure 1 is a partial longitudinal section of an open hearth furnace provided with my improved water cooled dampers;

Figure 2 is a partial horizontal section; 6 Figure 3 is a cross section showing the dampers in front elevation;

Figure 4is a partial cross section similar to F gure 3 showing a modification;

Figure 5 is a top plan view, partly broken away, of the water cooled slot enclosure;

Figure 6 is a vertical longitudinal section of Flgure 5;

Figure 7 is a vertical longitudinal section of one of the water cooled dampers;

Figures 8, 9 and 10 are detail views of damper parts hereinafter referred to;

Figures 11, 1'2 and 13 are detail views of the water cooled damper guides;

Figure 14 is an end view of the damper seat; and

Figure 15 is a detail view of the hanger frame for the damper.

My invention relates to the water cooling of open hearth structures, and particularly to the water cooling of the dampers now used in the so-called McKune system, wherein the inlet for the air and gas at the inlet end of a reversing open hearth furnace is small compared with the outlet port area at the opposite end for the outgoing gases.

The general damper systemherein shown is not my invention, as the same was invented by George L. Danforth, Jr.. of Chica 0, llllinois.

y invention relates to the water cooling of these movable dampers, and relates to the water cooling of the damper itself, of the slot through which it slides, and the structure of the hood, seat, guides, etc.

In the drawings, 2 represents an open hearth furnace of the usual reversing type, and in the furnace shown 3 is the uptake leading to the gas inlet port and 4, 4 are uptakes leading to the air inlet ports at the side of the covered gas port and rising over it. -Through the throat of the furnace, at each endare arranged two water cooled dampers, indicated generally by the number 5. The throat is provided with two slots through 50 "which these dampers slide, and over each slot is mounted a stationary enclosing hood 6 within which the'damper' may be raised.

The preferred form of damper is illustrated in Figures 7 to 10 and consists preferably of a surrounding hollow shell 7 preferably of generally rectangular form with rounded corners, and which may be made of welded sheet or plate steel.- The inner surface of this shell is preferably provided with ribs 8 Y which may be either separated or continuous and are shown as made in separated sections at the sides and ends of the inner surface. These ribs enter suitable recesses in the lining brick and serve to hold it in place. The space within this shell is filled in with fire brick, thus giving a fire brick damper with a surrounding metal cooling shell. The

cooling water is preferably fed in through a pipe 9 passing down through a sleeve pipe 10, the pipe 9 having an extension 11 so that the water is led down into one end of the hollow shell. The water, after circulating in the shell, flows out through the sleeve pipe 10 and another corresponding sleeve pipe 12. These sleeve pipes also serve as hangers for the valve, they being secured to an upper cross bar 13 having alifting yoke or ring 14 to which a wire rope may be attached for raising and lowering. On this lifting bar, 15 represents water connections, 16 being the inlet and 17 the outlet.-

Wi hin the hollow shell I also preferably enclose a high which is secure strips 19 and is connected with a high pres sure supply pipe 20 leading up to the supply and exhaust fitting 21. If the hollow shell becomes clogged with mud or an sediment or collectiop, it may be blown out y supplying high pressure fluid, such as water or air,

"to blow out the collection.

pressure perforated pipe 18 within the hollow shell by.

Each hood 6 is preferably suspended by hangers 22 from the structural work of the furnace, and comprises a metal shell having a cover 23 through which the hollow hangers and water connections extend.- These shells are preferably lined with fire brick 24, and a packing of heat'insulating material 25 is preferably p ovided between the refractory linin and the shell. In this manner, when the ampere are lifted, they will not be subjected. to the chilling of 'the outside air, which would tend to cause the brick to crack and spall. At its lower end, each hood preferably rests on a water cooled slot casing 26 which is preferabl inclined to suit the slope of the roof, ass own, for

low slot shells is preferably made of welded sheet or plate material, and in Figure 5, 27 represents the water inlet pipe and 28 the outlet pipe. In each of these shells I also preferably provide a perforated blowout pipe 29 having an inlet 30 for fluid under high pressure, this being generally similar to the corresponding pipe in the damper shell. I also preferably provide water cooled damper guides 31 at the points. shown in Figure 2, these preferably being of L-shape in cross section and of the form shown in detail in Figures 11 to 13, inclusive. They are also preferably made of welded plates and have the usual inlet and outlet pipes, wash-out plugs, etc. In this construction, 32 is the water outlet pipe extending to near the closed top, and 33 is the inlet ipe.

I may a so employ a Water cooled seat for the damper. as shown at 34 in the modified form of Figure 4:. This seat will protect the bottom portion of the water cooled damper from getting in direct contact with refractory material having a very high temperature. It is of especial advantage where the water is muddy or contains sediment which ma settle in the bottom of the damper coo er. In this water cooled seat, Which may be of welded plate material, 35 is the inlet pipe, 36 outlets, and 37 a high pressure perforated blow-off pipe through which fluid under considerable pressure may be fed when desired to clean out sediment.

The advantages of my invention will be apparent to those skilled in theart, sincean effective water cooling s'yste'ni' is provided for movable dampers in reversing regenerative furnaces.

The dampers may slide in over he side instead of from the top; the line of movement may be at an an le to the vertical; the details may be varie and other changes may be made without departing from my invention.

I claim 2- 1. In a reversing regenerative furnace, a

water cooled damper formed of refractory material with a water cooled shell surrounding the same, and means for insuring a forced circulation of the cooling water through said shell, comprising an inlet pipe extending a substantial and fixed distance within said shell, substantially as described.

2. In a reversing regenerative furnace a I water cooled damper and a water cooled'slot through which the damper moves, substantially as described.

3. In a reversing regenerative furnace, a water cooled damper and a refractory lined hood into which the same may be lifted through a slot in the furnac wall, substan tially as described.

4. In a reversing regenerative furnace, 9.

water cooled damper a hood projecting outward from the urnace wall, and a water cooled slot through the furnace wall, substantially as. described.

5. In a reversing regenerative furnace, a water..cooled damper, and hollow hangers for supporting the damper having supply and exhaust pipes for supplying liquid to the water cooled portion of the damper, substantially as described.

6. In a reversing regenerative furnace, a water cooled damper having a water circulating passage therethrough, and a high pressure fluid supply pipe extending into and terminating in the circulating passage, said high pressur fluid supply pipe constituting means by which sediment may be flushed out of the said circulating passage, substantially as described.

7. In a reversing regenerative furnace, a hollow water cooled casing forming a water cooled slot through the furnace wall, and connections for supplying fluid under high pressure within said casin to wfash out sediment, substantially as escribed.

8. A reversing regenerative furnace having a water cooled slot in its roof and a damper ,movable through the slot, substantially as described.

9. A reversing regenerative furnace having a water cooled slot in its roof and a water cooled damper movable through the slot, substantially as described.

10. In a reversing regenerative furnace, a! water cooled damper having water cooled guides, substantially as described.

11 In 'a reversing regenerative furnace, a water cooled damper, and water cooled guides therefor having seating portions for the damper, substantially as described.

12. In a reversing regenerative furnace, a water cooled damper and a water cooled seat therefor, substantially as described.

13. In a" reversing regenerative furnace, a Water cooled damper and water cooled guides partly enclosin and guiding the same, substantially as escribed.

14. A reversing regenerative furnace having a water cooled slot in its roof, and a refractory lined hood resting on the water cooled portion of the slot, substantially as described.

3 15. A water cooled damper having a surrounding water cooling frame with ribs or projections to hold the brickwork filling the interior thereof, substantially as described.

16. A reversing regenerative furnace hav- 18. A reversing regenerative furnace having water cooled slots in its throat portions and water cooled dampers vertically movable therethrough, said furnace having refractory lined hoods into which the dampers may be drawn, substantially as described. I

19. In a reversing regenerative furnace, a water cooled damper formed of refractory material with a water cooled shell extending around the entire periphery thereof, and means for insuring a forced circulation of the cooling water throughout said shell,

water cooled damper formed of refractory material with a water cooled shell surrounding the same, said shell having its inlet and outlet connections for the cooling Water adjacent each other, substantially as described.

In testimony whereof I have hereunto set my hand. 3

, EDWARD J. MGDON N ELL.

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