CA1211664A - Cooled tube supports for boilers - Google Patents
Cooled tube supports for boilersInfo
- Publication number
- CA1211664A CA1211664A CA000429777A CA429777A CA1211664A CA 1211664 A CA1211664 A CA 1211664A CA 000429777 A CA000429777 A CA 000429777A CA 429777 A CA429777 A CA 429777A CA 1211664 A CA1211664 A CA 1211664A
- Authority
- CA
- Canada
- Prior art keywords
- studs
- metal
- boiler
- roof casing
- roof
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
- F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
- F22B37/202—Suspension and securing arrangements for contact heating surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In boilers, process tubes are suspended by means of support studs that are in thermal contact with and attached to the metal roof casing of the boiler and the upper bend portions of the process tubes. The support studs are sufficiently short that when the boiler is in use, the support studs are cooled by conduction of heat to the process tubes and the roof casing thereby maintaining the temperature of the stud so that it does not exceed 1400 F.
In boilers, process tubes are suspended by means of support studs that are in thermal contact with and attached to the metal roof casing of the boiler and the upper bend portions of the process tubes. The support studs are sufficiently short that when the boiler is in use, the support studs are cooled by conduction of heat to the process tubes and the roof casing thereby maintaining the temperature of the stud so that it does not exceed 1400 F.
Description
-"`` J~Z~1664 F I E LD OF THE I NVENT I O~l
2 The present invention relates to boiler tube
3 supports and particularly to process tube supports for
4 hybrid boilers.
BACKGROUND OF TIHE INVENTION
.
6 There are a nunnber of techniques disclosed in 7 the art for locating process tubes within high tempera-8 ture boilers, Illustrative of such techniques are those g disclosed in U.S. Patent 3,385,271; U.S. Patent 3,552,362 and U.S. Pa~ent 4,244,606. In actual practice, how-11 ever, it is most common to have the process tubes 12 which are located in boilers suspended by tube supports 13 from a superstructure external the boiler roof casingO
14 Thus, the process tubes located in the boiler have upper portions which extend through the boiler roof 16 casing, form a ~end, and return back down through the 17 boiler roof casing. The tubes are suspended by tube 13 supports attached to the bend of the tube and super-19 structure over the roof casing. Experience has shown that these precautions are necessary to avoid mechanical 21 failure of the tube supports which would occur if the 22 supports were located within the boiler where temper-23 atures are generally above at least 1000F and often 24 are as high as about 2000F and a corrosive atmosphere exists, 26 There are a number of disadvantages to the 27 common tube support technique in practice; not the least 2~ of which is the difficulty associated with providing 29 appropriate expansion joints in the region where the process tubes penetrate the casing of the boiler. Thus, 31 there remains a need for a very simple and economical .. ......
12~
1 technique for supporting process tubes in a boiler 2 chamber, 4 sriefly stated, a vertically disposed serpen-tine tubular c~il is s~lspended within the convection 6 section of a boiler chamber from the upper return bends 7 of the tubular Iroil by means of metal supports which are 8 in thermal cont3ct with and attached to the upper return g bends of the tubular coiil. The supports pass through the insulation of the boiler roof and also are in 11 thermal contact with and attached directly to the metal 12 roof casing. The metal suppor~s are sufficiently short 13 thab, under conditions of use, the supports are cooled 14 by means of conduction oE heat to the metal roof casing and the process tubes.
1~ In one embodiment of the invention, a metal 17 sleeve and insulation are provided around that portion 18 of the support which extends from the upper return bend 19 of the tubular coil to the boiler roof insulation.
In another embodiment, the support is a metal 21 tube which has an opening above the roof casing and has 22 a plurality of orifices in the tube wall within the 23 boiler such that air from outside the boiler is aspirat-24 ed from external the boiler through the tube and into the boiler thereby providing for additional cooling of 26 the support.
27 In yet another embodiment, a liquid, such as 28 water, is sealed within the tubular supports so that 29 under conditions of use, the liquid in contact with that portion of the support within the boiler is heated and 31 vaporized. The vaporized liquid is then condensed at lZ11~6~
1 the cooler portion of the support which is in contact 2 with the roof casing. Thereafter!~ condensed liquid 3 returns by gravity to portions of the support within the 4 boiler ther~by cooling the support.
Thes,e and otber features of the present 6 invention will be better understood by reading a de-7 tailed description of the invention in connection 8 with the drawings.
g THE DRAWINGS
Figure 1 is a schematic diagram illus~rating 11 the support of process tubes in a hybrid boiler in 12 accordance with the prese~nt invention.
13 Figure 2 is a cross-section of a view taken 14 along lines 2,2 of Figure 1.
Figure 3 is a schematic illustration of an 16 alternate embodiment of the present invent;on.
17 Figure 4 is a schematic illustration of yet 18 another embodiment of the present inven~ion.
.
Referring particularly to Figures 1 and 2 of 21 the drawings, there is shown a metal roof casing 10 of a 22 hybrid boiler. The boiler, of course, is provided with 23 side walls and a floor (not shown) defining a convection 24 section of the boiler. Preferably, roof casing 10 is 2S provided with a plurality of upwardly directed channels 26 12 which extend along the length of the boiler roof~ As ~7 can be seen in Figure 2t an insulating material 14 is 28 located within each of the upwardly directed channels ~z~ 64 1 12. The insulating material is selected from typical 2 boiler insulating materials such as refractory materials, 3 ceramic fibers and the like.
4 Arranged within the convection section of the furnace are a plurality of serpentine tubes 1~) for the 6 passage theretlhrough of process fluid to be heated in 7 the boiler. A~; shown in Figures 1 and 2, the serpentine 8 process tube 16 has upper bend portions 17, lower bend g portions 18 and straight: run portions 15. The serpen tine tube 16 is suspended in the boiler in accordance 11 with the practice of the present invention as will be 12 described herein in greal:er detail.
13 At substantial]Ly the mid-portion of each upper 14 bend portion 17, there is provided a circular metal ring 19.
16 Ring 19 may be similar, for example, to a half 17 socket welding pipe coupling. In any event, ring 19 is 18 adapted to receive in engaging relationship and be in 19 thermal contact with one end of supporting stud 20. As is shown in the drawings, stud 20 is attached by welding 21 to ring 19; however, it should be readily appreciated 22 that ring 19 and stud 20 may be threaded so that stud 20 23 can be screwed into ring 19.
24 In the practice of the present invention supporting stud 20 preferably is either a cyclindrical 26 metal rod or tube. In any event, supporting stud 20 27 extends upwardly from ring 19 through the insulation 14 28 of channel 12 and through an opening in the roof casing 29 10 and roof casing reinforcing plate 21. The opening in the roof casing 10 and the reinforcing plate 21 are just 31 sufficient to accommodate the passage of supporting stud 32 20. As can be seen in the figures, the supporting stud - ` -1211~64 1 20 is welded to the casing reinforcing plate 21 and the 2 casing rein~orcing plate 21, i~ turn, is welded to the 3 roof casing 10. Thus, the support stud 20 is in thermal 4 contact with and attached to both the ~etal roof casing 10 and the serpentine tube 16.
6 It shlDuld be readily appreciated that stud 20 7 may be attachedl to roof casing 10 by other techniques 8 such as providillg a threaded portion on the upper end of 9 stud 20 and using a nut to retain stud 20 in position against reinforcing plate 21.
11 As is shown in the figures, the hybrid boiler 12 includes horizontally dispo~ed water tubes 22 which 13 generally are arranged so as to run transverse to the 14 direction of the serpentine tubes 16; however, water tubes 22 optionally may run parallel to the direction of 16 the serpentine tubes 16. Also, as is shown, a plurality 17 of support bars 23 are welded to the roof casing 10.
18 Generally U-shaped connectors 24:, which are welded 19 to ~he tubular water pipes 22, hang from the support bar 23 so that the pipes 22 are suspended immediately 21 below the roof casing 10 of the boiler.
22 In a preferred embodiment of the present 23 invention, the water tubes 22 also are provided wi~h 24 horizonatally arranged fins 25 which serve to enhance the heat transfer efficiency of water tubes 22.
26 Heat loss to the exterior of the boiler is 27 minimized by means of insulation 28 located, in general~, 28 between the top half of tubes 22 and the roof casing 29 10.
An extremely important feature of supporting 31 stud 20 is that it be sufficièntly short that when the lZ~1~i6~
1 furnace is in use, heat is conducted from stud 20 to 2 roof casing 10 and process tube 16 so that the tempera-3 ture of stud 20 will not exceed 1400F and preferably 4 1000F. Thus, while the gases within the boiler and in contact with stud 20 may be as high as 2000F, and even 6 higher-, stud 21D is cooled by conduction since it is in 7 thermal contacl: with the process tube 16 and the roof 8 casing 10, earh of which are at considerably lower 9 temperatures.
In a preferred embodiment, the protection of 11 the support stud 20 by conductive cooling is enhanced by 12 providing a metal sleeve 30 which extends downwardly 13 from a position interme~3iate channel member 12 to the 14 top surface of the upper bend portion 17 of tubes 16 and an insulating material 3~!, such as refractory insulation, 16 ceramic fibers and ~he like, is located within the tubu-17 lar sleeve 30. In this way, contact of the stud 20 with 18 hot gases is minimized and heat transfer by conduction 19 to the roof casing 10 is facilitated.
~0 In an alternate embodiment of the present 21 invention, shown in Figure 3, support stud 20 is a 22 hollow tu~e which is open at one end to the atmosphere 23 immediately above the roof of the boiler. Located 24 along the circumference of the tube support stud 20 near the other end boiler within the boiler are a plurality 26 of orifices. Since during operation of a hybrid boiler, 27 the convection chamber tends to be at a pressure lower 28 than atmospheric pressure, air will enter into the 29 furnace chamber by passing downwardly through the tubular support stud 20 through orifices 34 and then 31 through the porous insulating material 32. In this way, 32 the support stud 20 also is cooled by convection, as 33 well as by conduction to the roof casing 10 and tube 16.
~ - .\
- lZ~:~L664 1 In yet another embodiment of the present 2 invention, shown in ~igure 4, a liquid charge, shown 3 as reference numeral 34 in Figure 4, is sealed within 4 support 20 by tube sealing members 35. Any non-corrosive liquid which will reflux under conditions of 6 use of the boiler can b~e employed. One such liquid is 7 mineral free deareated water. Also, the amount of 8 liquid employecl is not critical. In general, the liquid 9 will be sufficient to substantially fill that portion of the support 20 which exltends below the water tubes 22.
11 Typicall~, the liquid charge will be at atmospheric 12 pressure at room temperature; however, the liquid may 13 optionally be at reduced pressure.
14 Optionally, support 20 may also be provided with a small needle valve (not shown) for maintaining a 16 check on the condition of the support.
17 In operation, the support 20 is cooled not 18 only by heat being conducted by the metal support 20 to 19 the relatively cooler roof casing 10 and the serpentine tube }6, but also by vaporization of the liquid in 21 contact with the portion of the support 20 within the 22 boiler which liquid-, after vapori~zation, condenses at 23 the end of the support 20 outside the boiler and in 24 contact with the roof casing 10, where it gives up its heat to the atmosphere and returns by gravity to the 26 portion of the support 20 for repeat of the cycle.
27 As will be readily appreciated, there are many 28 benefits to be gained by the practice of the present 29 invention. For example, since the process tubes 16 are supported within the convection section of the boiler, 31 the entire process tube surface serves as a heat input 32 surface, In boiler designs such as that set forth in 33 U.S. Patent 3,385,271, where the process tubes penetrate 1 Z ~ 1 6 ~ ~
l the roof casing for external support, the effective heat 2 input surface area of the tubes are significantly ~ reduc~sd. Consider also that tube surfaces located 4 outside of the boiler provide a means for increased heat loss, Then too expansioJI joints are not required in the 6 casing when thls process tub~ss are suppor~ed in accord-7 ance with the present invention, thereby avoiding the 8 problem of air leakage i.rom or into the boiler. More-9 over, fabrication and erection are simplifled because roof penetrations are eliminated or simplified, except ll for the inlet and outlet connections of the process 12 tubes. Veey importantl~, since the support studs are 13 fabricated from common pipe components, the need for 14 unusually designed parts: with their associated higher costs is avoided.
BACKGROUND OF TIHE INVENTION
.
6 There are a nunnber of techniques disclosed in 7 the art for locating process tubes within high tempera-8 ture boilers, Illustrative of such techniques are those g disclosed in U.S. Patent 3,385,271; U.S. Patent 3,552,362 and U.S. Pa~ent 4,244,606. In actual practice, how-11 ever, it is most common to have the process tubes 12 which are located in boilers suspended by tube supports 13 from a superstructure external the boiler roof casingO
14 Thus, the process tubes located in the boiler have upper portions which extend through the boiler roof 16 casing, form a ~end, and return back down through the 17 boiler roof casing. The tubes are suspended by tube 13 supports attached to the bend of the tube and super-19 structure over the roof casing. Experience has shown that these precautions are necessary to avoid mechanical 21 failure of the tube supports which would occur if the 22 supports were located within the boiler where temper-23 atures are generally above at least 1000F and often 24 are as high as about 2000F and a corrosive atmosphere exists, 26 There are a number of disadvantages to the 27 common tube support technique in practice; not the least 2~ of which is the difficulty associated with providing 29 appropriate expansion joints in the region where the process tubes penetrate the casing of the boiler. Thus, 31 there remains a need for a very simple and economical .. ......
12~
1 technique for supporting process tubes in a boiler 2 chamber, 4 sriefly stated, a vertically disposed serpen-tine tubular c~il is s~lspended within the convection 6 section of a boiler chamber from the upper return bends 7 of the tubular Iroil by means of metal supports which are 8 in thermal cont3ct with and attached to the upper return g bends of the tubular coiil. The supports pass through the insulation of the boiler roof and also are in 11 thermal contact with and attached directly to the metal 12 roof casing. The metal suppor~s are sufficiently short 13 thab, under conditions of use, the supports are cooled 14 by means of conduction oE heat to the metal roof casing and the process tubes.
1~ In one embodiment of the invention, a metal 17 sleeve and insulation are provided around that portion 18 of the support which extends from the upper return bend 19 of the tubular coil to the boiler roof insulation.
In another embodiment, the support is a metal 21 tube which has an opening above the roof casing and has 22 a plurality of orifices in the tube wall within the 23 boiler such that air from outside the boiler is aspirat-24 ed from external the boiler through the tube and into the boiler thereby providing for additional cooling of 26 the support.
27 In yet another embodiment, a liquid, such as 28 water, is sealed within the tubular supports so that 29 under conditions of use, the liquid in contact with that portion of the support within the boiler is heated and 31 vaporized. The vaporized liquid is then condensed at lZ11~6~
1 the cooler portion of the support which is in contact 2 with the roof casing. Thereafter!~ condensed liquid 3 returns by gravity to portions of the support within the 4 boiler ther~by cooling the support.
Thes,e and otber features of the present 6 invention will be better understood by reading a de-7 tailed description of the invention in connection 8 with the drawings.
g THE DRAWINGS
Figure 1 is a schematic diagram illus~rating 11 the support of process tubes in a hybrid boiler in 12 accordance with the prese~nt invention.
13 Figure 2 is a cross-section of a view taken 14 along lines 2,2 of Figure 1.
Figure 3 is a schematic illustration of an 16 alternate embodiment of the present invent;on.
17 Figure 4 is a schematic illustration of yet 18 another embodiment of the present inven~ion.
.
Referring particularly to Figures 1 and 2 of 21 the drawings, there is shown a metal roof casing 10 of a 22 hybrid boiler. The boiler, of course, is provided with 23 side walls and a floor (not shown) defining a convection 24 section of the boiler. Preferably, roof casing 10 is 2S provided with a plurality of upwardly directed channels 26 12 which extend along the length of the boiler roof~ As ~7 can be seen in Figure 2t an insulating material 14 is 28 located within each of the upwardly directed channels ~z~ 64 1 12. The insulating material is selected from typical 2 boiler insulating materials such as refractory materials, 3 ceramic fibers and the like.
4 Arranged within the convection section of the furnace are a plurality of serpentine tubes 1~) for the 6 passage theretlhrough of process fluid to be heated in 7 the boiler. A~; shown in Figures 1 and 2, the serpentine 8 process tube 16 has upper bend portions 17, lower bend g portions 18 and straight: run portions 15. The serpen tine tube 16 is suspended in the boiler in accordance 11 with the practice of the present invention as will be 12 described herein in greal:er detail.
13 At substantial]Ly the mid-portion of each upper 14 bend portion 17, there is provided a circular metal ring 19.
16 Ring 19 may be similar, for example, to a half 17 socket welding pipe coupling. In any event, ring 19 is 18 adapted to receive in engaging relationship and be in 19 thermal contact with one end of supporting stud 20. As is shown in the drawings, stud 20 is attached by welding 21 to ring 19; however, it should be readily appreciated 22 that ring 19 and stud 20 may be threaded so that stud 20 23 can be screwed into ring 19.
24 In the practice of the present invention supporting stud 20 preferably is either a cyclindrical 26 metal rod or tube. In any event, supporting stud 20 27 extends upwardly from ring 19 through the insulation 14 28 of channel 12 and through an opening in the roof casing 29 10 and roof casing reinforcing plate 21. The opening in the roof casing 10 and the reinforcing plate 21 are just 31 sufficient to accommodate the passage of supporting stud 32 20. As can be seen in the figures, the supporting stud - ` -1211~64 1 20 is welded to the casing reinforcing plate 21 and the 2 casing rein~orcing plate 21, i~ turn, is welded to the 3 roof casing 10. Thus, the support stud 20 is in thermal 4 contact with and attached to both the ~etal roof casing 10 and the serpentine tube 16.
6 It shlDuld be readily appreciated that stud 20 7 may be attachedl to roof casing 10 by other techniques 8 such as providillg a threaded portion on the upper end of 9 stud 20 and using a nut to retain stud 20 in position against reinforcing plate 21.
11 As is shown in the figures, the hybrid boiler 12 includes horizontally dispo~ed water tubes 22 which 13 generally are arranged so as to run transverse to the 14 direction of the serpentine tubes 16; however, water tubes 22 optionally may run parallel to the direction of 16 the serpentine tubes 16. Also, as is shown, a plurality 17 of support bars 23 are welded to the roof casing 10.
18 Generally U-shaped connectors 24:, which are welded 19 to ~he tubular water pipes 22, hang from the support bar 23 so that the pipes 22 are suspended immediately 21 below the roof casing 10 of the boiler.
22 In a preferred embodiment of the present 23 invention, the water tubes 22 also are provided wi~h 24 horizonatally arranged fins 25 which serve to enhance the heat transfer efficiency of water tubes 22.
26 Heat loss to the exterior of the boiler is 27 minimized by means of insulation 28 located, in general~, 28 between the top half of tubes 22 and the roof casing 29 10.
An extremely important feature of supporting 31 stud 20 is that it be sufficièntly short that when the lZ~1~i6~
1 furnace is in use, heat is conducted from stud 20 to 2 roof casing 10 and process tube 16 so that the tempera-3 ture of stud 20 will not exceed 1400F and preferably 4 1000F. Thus, while the gases within the boiler and in contact with stud 20 may be as high as 2000F, and even 6 higher-, stud 21D is cooled by conduction since it is in 7 thermal contacl: with the process tube 16 and the roof 8 casing 10, earh of which are at considerably lower 9 temperatures.
In a preferred embodiment, the protection of 11 the support stud 20 by conductive cooling is enhanced by 12 providing a metal sleeve 30 which extends downwardly 13 from a position interme~3iate channel member 12 to the 14 top surface of the upper bend portion 17 of tubes 16 and an insulating material 3~!, such as refractory insulation, 16 ceramic fibers and ~he like, is located within the tubu-17 lar sleeve 30. In this way, contact of the stud 20 with 18 hot gases is minimized and heat transfer by conduction 19 to the roof casing 10 is facilitated.
~0 In an alternate embodiment of the present 21 invention, shown in Figure 3, support stud 20 is a 22 hollow tu~e which is open at one end to the atmosphere 23 immediately above the roof of the boiler. Located 24 along the circumference of the tube support stud 20 near the other end boiler within the boiler are a plurality 26 of orifices. Since during operation of a hybrid boiler, 27 the convection chamber tends to be at a pressure lower 28 than atmospheric pressure, air will enter into the 29 furnace chamber by passing downwardly through the tubular support stud 20 through orifices 34 and then 31 through the porous insulating material 32. In this way, 32 the support stud 20 also is cooled by convection, as 33 well as by conduction to the roof casing 10 and tube 16.
~ - .\
- lZ~:~L664 1 In yet another embodiment of the present 2 invention, shown in ~igure 4, a liquid charge, shown 3 as reference numeral 34 in Figure 4, is sealed within 4 support 20 by tube sealing members 35. Any non-corrosive liquid which will reflux under conditions of 6 use of the boiler can b~e employed. One such liquid is 7 mineral free deareated water. Also, the amount of 8 liquid employecl is not critical. In general, the liquid 9 will be sufficient to substantially fill that portion of the support 20 which exltends below the water tubes 22.
11 Typicall~, the liquid charge will be at atmospheric 12 pressure at room temperature; however, the liquid may 13 optionally be at reduced pressure.
14 Optionally, support 20 may also be provided with a small needle valve (not shown) for maintaining a 16 check on the condition of the support.
17 In operation, the support 20 is cooled not 18 only by heat being conducted by the metal support 20 to 19 the relatively cooler roof casing 10 and the serpentine tube }6, but also by vaporization of the liquid in 21 contact with the portion of the support 20 within the 22 boiler which liquid-, after vapori~zation, condenses at 23 the end of the support 20 outside the boiler and in 24 contact with the roof casing 10, where it gives up its heat to the atmosphere and returns by gravity to the 26 portion of the support 20 for repeat of the cycle.
27 As will be readily appreciated, there are many 28 benefits to be gained by the practice of the present 29 invention. For example, since the process tubes 16 are supported within the convection section of the boiler, 31 the entire process tube surface serves as a heat input 32 surface, In boiler designs such as that set forth in 33 U.S. Patent 3,385,271, where the process tubes penetrate 1 Z ~ 1 6 ~ ~
l the roof casing for external support, the effective heat 2 input surface area of the tubes are significantly ~ reduc~sd. Consider also that tube surfaces located 4 outside of the boiler provide a means for increased heat loss, Then too expansioJI joints are not required in the 6 casing when thls process tub~ss are suppor~ed in accord-7 ance with the present invention, thereby avoiding the 8 problem of air leakage i.rom or into the boiler. More-9 over, fabrication and erection are simplifled because roof penetrations are eliminated or simplified, except ll for the inlet and outlet connections of the process 12 tubes. Veey importantl~, since the support studs are 13 fabricated from common pipe components, the need for 14 unusually designed parts: with their associated higher costs is avoided.
Claims (8)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a hybrid boiler, a metal roof casing, insulation below said roof casing, horizontally disposed water tubes below said insulation, at least one serpentine process tube below said water tubes, said serpentine tube having substantially parallel and spaced apart vertical straight run portions joined by upper and bottom bend portions, metal sockets welded to substantially the mid point above each upper bend portion of said serpentine tubes, said metal sockets adapted to receive an engaging relationship support studs, support studs inserted in said metal sockets and welded thereto so as to be in thermal contact with and attached to the upper bend portions of said tube, said metal studs extending upwardly through the insulation, through the roof casing, and thence through a roof casing reinforcing plate, said roof casing reinforcing plate being welded to said roof casing, each metal stud being welded to said roof casing reinforcing plate so as to be in thermal contact with and attached to said roof casing, and each of the support studs being sufficiently short so that under conditions of use each of the studs are cooled by conduction as a result of being in thermal contact with said process tubes and said metal roof casing.
2. The boiler of claim 1 wherein said studs are sufficiently short so that under conditions of use, the temperature of said studs does not exceed 1400°F.
3. The boiler of claim 2 wherein the temperature of said studs does not exceed 1000°F.
4. The boiler of claim 1 including upwardly directed channels in said roof casing extending the length of said casing, insulation in said channels, said process tube located so that said studs extend upwardly through the insulation in the channel and through the roof casing.
5. The boiler of claim 4 including tubular metal sleeves surrounding the metal studs at least from the insulation in the channel to the upper bend of said tube and defining a space therebetween and insulation in the space between said studs and said metal sleeves.
6. The boiler of claim 5 wherein said studs are metal tubes each having an opening to the atmosphere above said roof and having a plurality of orifices around and through the circumference of a portion of said tube which is located beneath the roof casing whereby atmospheric air passes from said atmosphere to said furnace through said studs thereby providing additional cooling said support studs.
7. In a boiler of the type including a metal roof casing having insulation on the bottom surface of said metal roof casing and including a plurality of serpentine process tubes having straight run portions, upper bend portions and lower bend portions, said tubes located so that straight run portions are vertically disposed in said boiler, the improvement comprising metal sockets welded to substantially the mid portion of each upper bend portion of said serpentine tubes, metal support studs welded to said metal sockets so as to be attached to and in thermal contact with the upper bends of said process tubes, each of said support studs extending upwardly through said insulation, through said roof casing and a metal reinforcing member on the upper surface of said roof casing, each reinforcing member being welded to said roof casing, and each of said metal studs being welded to said reinforcing roof casing member, said studs being sufficiently short whereby said support studs are cooled by conduction as a result of being in thermal contact with said process tube and said roof casing.
8. The boiler of claim 7 wherein said studs are metal tubes each having an opening to the atmosphere above said roof casing and having a plurality of orifices around and through the circumference of a portion of said tube which is located beneath the roof casing whereby atmospheric air passes from said atmosphere to said furnace thereby providing additional cooling said support studs.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44883782A | 1982-12-10 | 1982-12-10 | |
| US06/448,838 US4444157A (en) | 1982-12-10 | 1982-12-10 | Liquid cooled tube supports |
| US448,837 | 1982-12-10 | ||
| US448,838 | 1982-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211664A true CA1211664A (en) | 1986-09-23 |
Family
ID=27035505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000429777A Expired CA1211664A (en) | 1982-12-10 | 1983-06-06 | Cooled tube supports for boilers |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1211664A (en) |
| GB (1) | GB2132331B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520921B (en) * | 2020-04-14 | 2021-10-01 | 哈尔滨锅炉厂有限责任公司 | Thin-wall fused salt heat absorber tube panel |
-
1983
- 1983-06-06 CA CA000429777A patent/CA1211664A/en not_active Expired
- 1983-06-07 GB GB08315569A patent/GB2132331B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2132331B (en) | 1986-03-19 |
| GB8315569D0 (en) | 1983-07-13 |
| GB2132331A (en) | 1984-07-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |