US1863352A - Device for utilizing waste heat - Google Patents

Description

G. s. PIERCE ET AL 1,863,352

DEVICE FOR UTILIZING WASTE HEAT Filed Nov. 15, 1928 2 sheets-sheet 1 June 14, 1932.

June 14, 1932. G. 's PIERCE ET AL DEVICEFOR UTILIZING WASTE HEAT Filed Nov. l5, 1928 2 Sheets-Sheet 2 INVENTORS ATTORNEYS Patented June 14, 1932 unire-n sfr-.Aras

cit-EN s, France, aan avancer s. GHITTUM, ce comarcas. care, Asslenoas a0. BUGKEYE seem casernes COMPANY, or c@ammalaV crac. e coaecaarlcu or OHIO rara-,Nr ortie-E;

DEVICE. non. UTILIZING. Hitler Application mea November 15, 192e. serial No. 319,577.

Thisv invention relates to improvements in means for utilizing the Waste heat of an industrial furnacesu'chas an open hearth furnace, and it more particularly relates to an improved mechanism for operating the valve which diverts the heat and to improved means for installingthe saine inthe furnace stach.

@ne of the objects of the invention is to provide a valvec'asing which can be readily installed in the stack at a point in close proximity tothe talreoi conduit for the Wastegases and which will act to support the upper part of the stack.

i A Jfurther object of the invention is to provide improved operating mechanism for the valve of a nature Which will permit the valve to be readily opened and closed.

Further objects of the invention Will appear from the accompany-ing description'and claims.

VIn the accompanying drawings F ig; 1 is a top, plan view, partly in transverse-section, showing our improved construction.

Fig. A2 is a partial sectionK on the line Qj-Q of Fig. 1,.A

Fig.' 3 is an enlarged vertical section through one of the bea-rings of one of the valve operating shafts.

Fig. 4 isa view partly in front elevation and partly in vertical section.

Fig. 5 is an enlarged fragmentary section on the line 5-5 O Fig; 2.

Fig. 6 isa section on the line -fot Fig. l.

Fig'. 7j is an elevation on a reduced scale, Showing a portion of; a Self-Supporting Stack in which our improved device is incorpo.. rated.

Fig. Sis a sect-ion on the line ST8, 0f Fig. l, with some of the parts in a different vvorlr-J ing position from that shown in the other figures. Y

9. and 1 0 arc enlarged perspective views of details of the supporting track for the valve.

VReferring to the drawings SV represents the upper portion and S the lower Lportion respectively of a furnace stack of the selflsupporting type to which our improved valve or damper-mechanism has been applied; 'The lower portion SU' of' the stackr i'sv snitahby1 braced by members M at the bottom and is in the present case lined. .with a refractory material A talreoii conduit C. is connect? ed to this lower portion S1 tor thepnrpose of carrying away the. hot g-aseste. a. boiler (not shown). or other point Where the heat may be utilized.

lt has beenA the practice in some cases there the. Waste heat is taken from the stack; toj place a valve or damperI in the; top.v @It the stack7 such location' however being ,ohjees tionable. tor variousy reasonsione off vv-l'iichv that much heat is lost by convection or1ra1` diation and. another being that the services of a steeplejaclr. are frequently required to pack the valve and that the valve must neo-A essarily be located a greatdistance `from the operating mechanism. It apparentv therej fore that the idealpoint for the location of; the valve or damper isianmediately abcrvc the conduit C', as the loss of heat due to. raf. di'ation or convection` is.- minimized and the` erection and maintenance o hazards ncs dental to stach-.top dampers eliminated. It is also. obvious that installation of the dampf er ata point adjacent the conduit necessitatesa construction o valvercasifng which is calculated to. be supported the loiver'porf. tion of the stack and in turn support; the-"up.. per-portion of the stack.

The valve casing is formed of tvvov partsjl and 2 to. provide acentral valve chamber 3: and upper and lower aligned cylindrical ex-A tensions 4, which communica-te with the chamber. In the event that this construceY tion is applied toy an existing stack, the tivo parts of the casing are placed around the stack at the desired point and bolted 130.-,

gether by bolts 5. which. pass through the flat-faced: v'flanges or joints 5. Rivets. arev then driven through the stack and' the. exe tensions and that portion of the stack which` passes through the. 'chamber 3 cut away in any suitable manner such as by an oxygen torch. The removal of this comparatively nar-row band from the stack result-s separating the` stack in two parte,V the4 upper and lower portions S and S" previously 1re?.

ferred to, the lower portion supporting the valve casing and the valve casing in turn supporting the upper portion.

The central valve chamber is in the nature of an enlargement, one-half thereof being semi-circular'in shape and the other half having its outside dimensions of rectangular form, with one side of the rectangular shaped part formed open and provided with attaching flanges 6 for the purpose to be explained.

V"Each casing' member and its extension are integrally formed and suitably braced by integral ribs 7 to provide a structure of sufiicient strength to support the upper portion of the stack.

Inside and at the top of the lower stack portion S a valve seat member 10 is placed. The valveseat proper is indicated at 11, and is a comparatively narrow flat concentric seat, from which rise upwardly and angularly an outside wall 12 and an inside wall 13, the wall 13 being uniformly shaped while the wall 12 varies so as to present or effect a continuation at 12, the purpose of which will appear later. The seat member 10 is also provided with a downwardly extending flange 14 which serves to locate the member 10 concentrically within the stack portion S, while around the lower slope of the wall 12 a fire-clay luting is employed, the lining R also being extended to the under. side of the wall 13 to protect and seal the seat from theheat. Y

An annular valve 15 is provided, the

' diameter of which is aproximately the mean diameter of the seat 11, there being an annular extension 16 which may rest directly on the seat 11, or which may embed itself in a sand seal, the walls 12 and 13, in connection with the seat 11, forming a trough adapted for this purpose. The under side of the valve 15 is provided with a plurality of ribs 17 having laterally extending flanges 17', the flanges 17 serving to retain in position the refractory lining 18 which is preferably packed into the spaces between the ribs 17.

The valve has a pair-fof diametrically opposite bosses 19 through which a shaft 2O is passed, which shaft has at each end a roller 21. In alignment with the rollers 21 are tracks 22, supported partly on the bottom of the chamber 3 and partly on a metal plate 23 which is secured to the lower fiange 6 at the open end of the chamber and forms a continuation of the bottom of the chamber. The plate 23 is the bottom of a box-like housing into which the valve is withdrawn when it is desired to allow the gases Vto pass to atmosphere at the top of the stack S', the housing heilig preferable since it is desired that leakageA of air into the stack is to be reduced as far as possible. The housing is formed of the bottom 23, sides 24, a removable top 25, and a removable end 26, with suitable stiffening girders and braces, such `with a gear 35 on a shaft 36, on which are two pinions 37 with which are meshedA rackbars 38, resting on said pinions 37. The forward ends of the rack-bars have apertures through which are loosely passed the ends of the shaft 20. When the hand wheel 30 is turned there will be a forward or rearward movement, as the case may be, of the rackbars 38, resulting in a movement of the valve 15. The initial opening movement of the valve 15 (from the position shown in Fig. 2) is a sliding movement along the seat 11, until the rollers 21 Contact with the inclined ends 22l of the tracks 22, whereupon the valve is lifted bodily from the seat. When the rollers are' on the tracks 22, the valve is pivotally` suspended from the shaft 20, and provision is made to prevent the valve catching on any obstruction that may hinder its passage to the rear of the box structure (Fig. 8), the

LAV

previously mentioned extended wall 12 serving to guide the valve, aided later by a. beam 40, notched to accommodate the operating shafts 28, 33 and 36. Fixed to the sides 24. are a pair ofangle plates 42, which support the rear ends of the rack-bars 38 when the valve is moved to open position. At various-points around the chamber 3 are placed hand-hole openings 43 for the purpose of allowing renewal of the sand filling when desired.

In order to prevent substantial leakage of air into the stack through the housing'and valve chamber the shaft bearings 29` are each provided with a Vsolid bushing 44 which closely surrounds the shaft `andsaid bearings are further provided with a fiat flange 45 which is secured against the walls 24 and to the outside thereof, the cap 46 which secures the bushing 44 in place being also on the outside To each'track 22 is fixed a removable bumper 47 which limits the rearward movement, the removability of which allows for easy assembling of the valve in the stack, although it is also possible to lower the valve into the box by removing the upper cover plate 25.

Having thus described our invention we claim:

1. In a mechanism of the character described, a chamber having a valve seat, a valve cooperating with said seat, a Vpair of stationary track rails for said valve each having an inclined portion adjacent said seat, a pair of racksV pivotally connected directly with said valve, and means for reciprocating said racks.

2. In a mechanism of the character de-` scribed, a chamber having'a valve seat, a valve cooperating with said seat, a pair of stationary track rails for said valve each having an inclined portion adjacent said seat, a pair of racks pivotally connected directly with said valve, and means for reciprocating said vracks, said means comprising a shaft; pinions connected with said shaft and meshed said racks, an operating shaft, and gearing between the two shafts.

3. In a mechanism of the character described, a chamber having a valve seat, a valve cooperating with said seat, a pair of anti-friction rolls carried by said valve, a pair of stationary track rails for said valve cooperating with said rolls and each having an inclined portion adjacent said seat, a pair of racks pivotally connected directly with said valve, and means for reciprocating said racks.

4. In a mechanism of the character described, a chamber having a horizontally arranged annular valve seat, a horizontal dislishaped valve cooperating with said seat, one side of said chamber being open, a housing connected with the open side of said chamber and communicating therewith, a pair of racks pivotally connected directly with said valve, a pair of track rails leading from said seat into said housing each having an inclined portion adjacent said seat, operating mechanism supported in said housing including pinions meshed with said racks, supports in said housing for said racks, and means in said housing for supporting said valve.

5. In a valve mechanism adapted to be inserted in a furnace stack formed of two spaced-apart sections, the combination of a structure for connecting the stack sections and supporting the upper stack section comprising a valve chamber and upper and lower cylindrical extensions to receive adjacent ends of the stack sections rigidly connected with the chamber, a movable valve in said chamber, and means carried by said structure for operating said valve.

6. In a valve mechanism adapted to be inserted in a furnace stack formed of two spaced-apart sections, the combination of a sectional structure for connecting the stack sections and supporting the upper stack section comprising a valve chamber and upper and lower cylindrical extensions to receive adjacentends of the stack sections rigidly connected with the chamber, means for clamping the parts of said structure together and thereby clamp the cylindrical extensions to the stack sections, a movable valve in said chamber, and means carried by said structure for operating said valve.

7. In a valve mechanism adapted to be inserted in a furnace stack formed of two spaced-apart sections, the combination of a two-part structure for connecting the stack sections and supporting the upper stack section comprising a valve chamber and upper and lower cylindrical extensions to receive adjacent ends of the stack sections, means for clamping the parts of said structure together to thereby clamp the extensions about the stack sections, a movable valve in said chamber, a housing connected to and communicating with said valve chamber, and means carried by said structure and encased in said housing and chamber for operating said valve.

8. In a valve mechanism adapted to be inserted in a furnace stack formed of two spaced-apart sections, the combination of a sectional structure for connecting the stack sections and supporting the upper stack section comprising a valve chamber and upper and lower cylindrical extensions rigidly connected with said chamber to receive the adjacent ends of the stack sections, means for clamping the parts of said structure together to thereby cause the extensions to clamp the stack sections, that portion of the structure forming the valve chamber having an opening of rectangular form, a housing secured about the walls of said opening, a valve seat in said chamber which surrounds the upper end of the lower stack section, a valve cooperating with said seat, and means located in said chamber and housing for moving said valve to and from its seat.

In testimony whereof, we have hereunto set our hands this 25th day of October, 1928.

GLEN S. PIERCE.

EVERETT S. CHITTUM.

lso

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