CA2205452C - Boiler with downcomers forming part of support structure - Google Patents
Boiler with downcomers forming part of support structure Download PDFInfo
- Publication number
- CA2205452C CA2205452C CA 2205452 CA2205452A CA2205452C CA 2205452 C CA2205452 C CA 2205452C CA 2205452 CA2205452 CA 2205452 CA 2205452 A CA2205452 A CA 2205452A CA 2205452 C CA2205452 C CA 2205452C
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- bent tubes
- boiler
- profile
- tubes
- header
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
- F22B21/346—Horizontal radiation boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/02—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially straight water tubes
- F22B21/04—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from substantially straight water tubes involving a single upper drum and a single lower drum, e.g. the drums being arranged transversely
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/22—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight
- F22B21/24—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes of form other than straight or substantially straight bent in serpentine or sinuous form
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combustion Of Fluid Fuel (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A water/steam boiler wherein a flexible tube boiler has front and rear downcomers embedded in the front and rear walls and which are shaped in a way to add structural support to the boiler and to also allow for water cooled front and rear walls. Three different tube profiles are shown which can be used in combination. The tube profiles may be tangential or not and can allow for passage for combustion gases in a desired direction.
Description
BOILER WITH DOWNCOMERS FORMING A PART OF SUPPORT STRUCTURE
FIELD OF THE INVENTION
The present invention relates to designs for boilers and more particularly, relates to a design for a flexible tube boiler.
S BACKGROUND OF THE INVENTION
The use of boilers is well known in the art and many different designs have been proposed. The boilers may be used for heating fluids such as water, glycol/water mixtures, thermal fluids, etc. They may be used for producing steam at low or high pressure by means of a heat exchange with the hot gases that are the products of combustion.
Generally, furnace or boiler circuits that receive heat cause the fluid to flow from a low elevation to a high elevation while the water or other fluid is continuously circulated through the outflowing circuits to down flowing circuits which are generally referred to as downcomers. All such circuits generally originate at a common point which is known as a header or drum and terminate at a common point in either a header or a drum.
As therefore mentioned, many designs are known in the art.
However, there still exists a need for a flexible tube boiler design wherein a high efficiency is achieved while having a structure such that they are relatively inexpensive to manufacture.
BRIEF SUMMARY OF THE INVENTION
According to one aspect of the present invention, there is provided a boiler comprising a front wall, a rear wall, a pair of opposed side walls, a lower header, an upper header, a plurality of bent tubes extending between the lower header and the upper header and being in fluid communication therewith, a first upper horizontal conduit in fluid communication with the upper header, the first upper horizontal conduit being located proximate the front wall, a second upper horizontal conduit in fluid communication with the upper header, the second upper horizontal conduit being located proximate the rear wall, a second lower horizontal conduit in fluid communication with the lower header, the first lower horizontal conduit being located proximate the front wall, a second lower horizontal conduit in fluid communication with the lower header located proximate the rear wall, a first pair of downcomers, the first pair of downcomers being located adjacent the front wall and being in fluid communication with the first upper horizontal conduit and the first lower horizontal conduit, and a second pair of downcomers located adjacent the rear wall, the second pair of downcomers being in fluid communication between the second upper horizontal conduit and the second lower horizontal conduit, the arrangement being such that the horizontal conduits and the downcomers define a frame for the boiler.
According to a further aspect of the present invention, there is provided a boiler comprising a front wall, a rear wall, and a pair of opposed side walls, an upper header, a lower header, and a plurality of bent tubes extending between and in fluid communication with the upper header and the lower header, each of the tubes having a profile comprised of a first section exiting from the lower header, a horizontal floor section, a riser section extending vertically upwardly adjacent one of the side walls, a plurality of interconnecting U-shaped sections extending between one of the side walls and a central vertical plane of the boiler, and an entry section extending between an uppermost of the U-shaped sections and the upper header.
In a preferred aspect of the invention, the bent tubes are designed to have three different profiles. In a first section of the boiler proximate the front wall thereof, first and second profile tubes are alternated in a tangential manner. In a rearward section of the boiler proximate the rear wall thereof, bent tubes having a first and a third profile are arranged in a non-tangential manner. The arrangement is such that combustion gases passing through the front section are forced to flow in a longitudinal direction while in the rear section, they are permitted to flow upwardly through a passing lane into a convection section of the boiler.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the invention, reference will be made to the accompanying drawings illustrating embodiments thereof, in which:
Figure 1A is a side elevational view, partially in a section, of a boiler illustrating the flow of gases throughout the convection zone;
Figure 1B is a view similar to Figure 1A showing an alternative gas flow pattern;
Figure 2 is a side elevational view illustrating the fluid circulation patterns in the boiler of Figure 1B;
Figure 3 illustrates, in side elevational view, a boiler arrangement used to heat water;
Figure 4 is a cross-sectional view taken at the front end of a steam boiler;
Figure 5 is a cross-sectional view of a steam boiler at the rear end thereof;
Figure 6A is a rear elevational view of the rear wall of a steam boiler showing a downcomer arrangement with provision for an access opening;
Figure 6B is an elevational view of the front wall thereof;
Figure 7A is an elevational view, partially in the cutaway, of a rear wall for a water boiler;
Figure 7B is an elevational view of the front wall thereof;
Figure 8A is an elevational view of a first tube profile for use in a steam boiler;
Figure 8B is an elevational view of a first tube profile for use in a hot water boile r Figure 9A is an elevational view of a second tube profile for use in a steam boiler;
Figure 9B is an elevational view of a second tube profile for use in a hot water boiler;
Figure 10A is an elevational view of a third tube profile for use in a steam boiler;
Figure 10B is an elevational view of a third tube profile for use in a hot water boiler;
Figure 11 is an elevational view of the combination of tube profiles used in the front section of a steam boiler;
Figure 12 is an elevational view of the tube profiles used in the rear portion of a steam boiler;
Figure 13 is a perspective view, partially in cutaway, of the front portion of a boiler according to the present invention; and Figure 14 is an enlarged perspective view illustrating the structural arrangement between the downcomer and fluid flow patterns.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings in greater detail and by reference characters thereto, there is illustrated a boiler which is generally designated by reference numeral 10. Boiler 10 includes a lower header 12 and an upper header or drum 14. Boiler 10 is of a generally overall rectangular configuration having a front wall 16 and a rear wall 18 with a burner port 20 being provided in front wall 16. The flow of combustion gases is illustrated in Figures 1A and 1B by means of arrow 22.
As shown in Figure 1A and as will be discussed in greater detail hereinbelow, combustion gas flow 22 may initially flow in a first horizontal direction from the front wall rearwardly, and then reverse direction as they pass through a so-called turning lane to a convection zone. A baffle 24 may be utilized to divide the convection zone in two to allow a further pass before the combustion gases exit through a combustion gas outlet 26 located proximate rear wall 18.
FIELD OF THE INVENTION
The present invention relates to designs for boilers and more particularly, relates to a design for a flexible tube boiler.
S BACKGROUND OF THE INVENTION
The use of boilers is well known in the art and many different designs have been proposed. The boilers may be used for heating fluids such as water, glycol/water mixtures, thermal fluids, etc. They may be used for producing steam at low or high pressure by means of a heat exchange with the hot gases that are the products of combustion.
Generally, furnace or boiler circuits that receive heat cause the fluid to flow from a low elevation to a high elevation while the water or other fluid is continuously circulated through the outflowing circuits to down flowing circuits which are generally referred to as downcomers. All such circuits generally originate at a common point which is known as a header or drum and terminate at a common point in either a header or a drum.
As therefore mentioned, many designs are known in the art.
However, there still exists a need for a flexible tube boiler design wherein a high efficiency is achieved while having a structure such that they are relatively inexpensive to manufacture.
BRIEF SUMMARY OF THE INVENTION
According to one aspect of the present invention, there is provided a boiler comprising a front wall, a rear wall, a pair of opposed side walls, a lower header, an upper header, a plurality of bent tubes extending between the lower header and the upper header and being in fluid communication therewith, a first upper horizontal conduit in fluid communication with the upper header, the first upper horizontal conduit being located proximate the front wall, a second upper horizontal conduit in fluid communication with the upper header, the second upper horizontal conduit being located proximate the rear wall, a second lower horizontal conduit in fluid communication with the lower header, the first lower horizontal conduit being located proximate the front wall, a second lower horizontal conduit in fluid communication with the lower header located proximate the rear wall, a first pair of downcomers, the first pair of downcomers being located adjacent the front wall and being in fluid communication with the first upper horizontal conduit and the first lower horizontal conduit, and a second pair of downcomers located adjacent the rear wall, the second pair of downcomers being in fluid communication between the second upper horizontal conduit and the second lower horizontal conduit, the arrangement being such that the horizontal conduits and the downcomers define a frame for the boiler.
According to a further aspect of the present invention, there is provided a boiler comprising a front wall, a rear wall, and a pair of opposed side walls, an upper header, a lower header, and a plurality of bent tubes extending between and in fluid communication with the upper header and the lower header, each of the tubes having a profile comprised of a first section exiting from the lower header, a horizontal floor section, a riser section extending vertically upwardly adjacent one of the side walls, a plurality of interconnecting U-shaped sections extending between one of the side walls and a central vertical plane of the boiler, and an entry section extending between an uppermost of the U-shaped sections and the upper header.
In a preferred aspect of the invention, the bent tubes are designed to have three different profiles. In a first section of the boiler proximate the front wall thereof, first and second profile tubes are alternated in a tangential manner. In a rearward section of the boiler proximate the rear wall thereof, bent tubes having a first and a third profile are arranged in a non-tangential manner. The arrangement is such that combustion gases passing through the front section are forced to flow in a longitudinal direction while in the rear section, they are permitted to flow upwardly through a passing lane into a convection section of the boiler.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the invention, reference will be made to the accompanying drawings illustrating embodiments thereof, in which:
Figure 1A is a side elevational view, partially in a section, of a boiler illustrating the flow of gases throughout the convection zone;
Figure 1B is a view similar to Figure 1A showing an alternative gas flow pattern;
Figure 2 is a side elevational view illustrating the fluid circulation patterns in the boiler of Figure 1B;
Figure 3 illustrates, in side elevational view, a boiler arrangement used to heat water;
Figure 4 is a cross-sectional view taken at the front end of a steam boiler;
Figure 5 is a cross-sectional view of a steam boiler at the rear end thereof;
Figure 6A is a rear elevational view of the rear wall of a steam boiler showing a downcomer arrangement with provision for an access opening;
Figure 6B is an elevational view of the front wall thereof;
Figure 7A is an elevational view, partially in the cutaway, of a rear wall for a water boiler;
Figure 7B is an elevational view of the front wall thereof;
Figure 8A is an elevational view of a first tube profile for use in a steam boiler;
Figure 8B is an elevational view of a first tube profile for use in a hot water boile r Figure 9A is an elevational view of a second tube profile for use in a steam boiler;
Figure 9B is an elevational view of a second tube profile for use in a hot water boiler;
Figure 10A is an elevational view of a third tube profile for use in a steam boiler;
Figure 10B is an elevational view of a third tube profile for use in a hot water boiler;
Figure 11 is an elevational view of the combination of tube profiles used in the front section of a steam boiler;
Figure 12 is an elevational view of the tube profiles used in the rear portion of a steam boiler;
Figure 13 is a perspective view, partially in cutaway, of the front portion of a boiler according to the present invention; and Figure 14 is an enlarged perspective view illustrating the structural arrangement between the downcomer and fluid flow patterns.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to the drawings in greater detail and by reference characters thereto, there is illustrated a boiler which is generally designated by reference numeral 10. Boiler 10 includes a lower header 12 and an upper header or drum 14. Boiler 10 is of a generally overall rectangular configuration having a front wall 16 and a rear wall 18 with a burner port 20 being provided in front wall 16. The flow of combustion gases is illustrated in Figures 1A and 1B by means of arrow 22.
As shown in Figure 1A and as will be discussed in greater detail hereinbelow, combustion gas flow 22 may initially flow in a first horizontal direction from the front wall rearwardly, and then reverse direction as they pass through a so-called turning lane to a convection zone. A baffle 24 may be utilized to divide the convection zone in two to allow a further pass before the combustion gases exit through a combustion gas outlet 26 located proximate rear wall 18.
In the embodiment illustrated in Figure 1B, baffle 24 is eliminated while combustion gas outlet 26 is located proximate front wall 16.
The flow pattern of the combustion gases is partially a function of the design and arrangement of the bent tube configurations which will now be referred to, A first tube profile is shown in Figures 8A and 8B. The profile of Figure 8A is substantially identical to that of Figure 8B
except that the arrangement shown in Figure 8B is one which would be suitable for a hot water boiler while the arrangement in Figure 8A would be suitable for a steam boiler. Similar reference numerals are thus employed for both embodiments with the embodiment for hot water having reference numerals in the 100's.
In the illustrated embodiment of Figure 8A, there is provided a pair of tubes generally designated by reference numeral 30 and which tubes are in fluid communication with lower header 12 and upper drum or header 14. At lower header 12, tube 30 has an exit portion 32 connected approximately halfway up lower header 12. From exit portion 32, there is an upwardly angled portion 34 which in turn continues on as a horizontal floor portion 35. Horizontal floor portion 35 is in fluid communication with a riser 36. At its upper end riser 36 is in fluid communication with a plurality of U-shaped sections generally designated by reference numeral 38. At its upper extremity, tube 30 enters upper drum 14 in its lower right-hand quadrant.
Tubes 30 and 30' are substantial mirror images of each other about a center plane line 40.
A second tube profile is shown in Figures 9A and 9B and like the embodiment of Figures 8A and 8B, there are a pair of tubes 43, 43'.
Tube 43 is in fluid communication with lower header 12 and exits therefrom in its upper right-hand quadrant through exit portion 44. Subsequently, there is provided a horizontal floor portion 45 which ~ CA 02205452 1997-OS-12 is in communication with riser 46. In a manner similar to the previously described embodiment, there are also provided a plurality of U-shaped portions 47, the uppermost one of which terminates in an upwardly angled entry portion 48 in fluid communication with the lower right-hand quadrant of upper drum 14.
A similar arrangement is provided for the embodiment illustrated in Figure 9B.
The third tube profile is shown in Figures 10A and lOB and comprises tubes 60 and 60'. In this embodiment, tube 60, in a manner similar to tube 30, has an exit portion 49 communicating with an upwardly angled portion 50 which in turn communicates with a horizontal floor portion 51. A riser 52 extends between horizontal floor portion 51 and a further horizontal floor upper portion 53. Horizontal portion 53 extends inwardly to terminate in a U-shaped portion 54 which has a leg formed as an upwardly angled portion 55. Subsequently, in an arrangement similar to the previously described embodiments, there are provided a plurality of U-shaped portions 56, the uppermost one of which terminates in a upwardly angled portion 57 in fluid communication with upper drum 14 in its lower right-hand quadrant.
In a front portion of boiler 10 - i.e. adjacent front wall 16, the bent tube arrangement is such so as to provide alternating tubes 30 and 43. This arrangement continues for a substantial portion of the length of a boiler 12 while adjacent rear walls 18, one provides for alternating tubes of the type shown in Figures 8 and 10 - i.e. tubes 30 and tubes 60 are arranged in an alternating fashion. This creates a passageway for the gases to pass upwardly into the convection zone defined by the U-shaped portions of the tubes.
Boiler 10 utilizes a downcomer vertical conduit and downcomer horizontal conduit arrangement which forms a structural portion of the boiler and will now be described in greater detail.
Adjacent front wall 16, there is provided a front upper horizontal conduit 64 and a front lower horizontal conduit 66. Conduits 64 and 66 are in fluid communication with upper header 14 as indicated by the arrows. Similarly, downcomer 68 and 70 provide a flow path between front upper horizontal conduit 64 and front lower horizontal conduit 66; front lower horizontal conduit is in fluid communication with lower header 12 as may be best seen in Figures 13 and 14.
Proximate rear wall 18, and in a manner similar to that described with respect to the arrangement proximate front wall 16, there is provided a rear upper horizontal conduit 74 and a rear lower horizontal conduit 76. Rear upper horizontal conduit 74 is in fluid communication with upper header 14 while rear lower horizontal conduit 76 is in fluid communication with lower header 12. Downcomers 78 and 80 provide fluid communication between rear upper horizontal conduit 74 and 1_5 rear lower horizontal conduit 76.
The walls may be cooled by means of a plurality of riser tubes 84. Similarly, there may be provided a rear access opening 88 to boiler 12 and a plurality of cooling conduits 90 may be situated thereabout.
Similarly, burner port cooling conduits 94 may be provided in the manner illustrated in Figure 7B.
Boiler 10 may be enclosed by first side wall 98 having insulation 100 located adjacent thereto and a second side wall 102 having insulation 104 associated therewith.
The above embodiments provide a number of advantages wherein the downcomers are adjacent the front and rear walls and are shaped to contour the furnace and allow for a water cooled front and rear wall.
Apart from the downcomers providing a natural fluid circulation, they also serve as structural members to strengthen the boiler and provide a more rugged core. The possibility of having front end or rear water cooled walls can eliminate refractory maintenance and reduce boiler and low heat losses.
The flow pattern of the combustion gases is partially a function of the design and arrangement of the bent tube configurations which will now be referred to, A first tube profile is shown in Figures 8A and 8B. The profile of Figure 8A is substantially identical to that of Figure 8B
except that the arrangement shown in Figure 8B is one which would be suitable for a hot water boiler while the arrangement in Figure 8A would be suitable for a steam boiler. Similar reference numerals are thus employed for both embodiments with the embodiment for hot water having reference numerals in the 100's.
In the illustrated embodiment of Figure 8A, there is provided a pair of tubes generally designated by reference numeral 30 and which tubes are in fluid communication with lower header 12 and upper drum or header 14. At lower header 12, tube 30 has an exit portion 32 connected approximately halfway up lower header 12. From exit portion 32, there is an upwardly angled portion 34 which in turn continues on as a horizontal floor portion 35. Horizontal floor portion 35 is in fluid communication with a riser 36. At its upper end riser 36 is in fluid communication with a plurality of U-shaped sections generally designated by reference numeral 38. At its upper extremity, tube 30 enters upper drum 14 in its lower right-hand quadrant.
Tubes 30 and 30' are substantial mirror images of each other about a center plane line 40.
A second tube profile is shown in Figures 9A and 9B and like the embodiment of Figures 8A and 8B, there are a pair of tubes 43, 43'.
Tube 43 is in fluid communication with lower header 12 and exits therefrom in its upper right-hand quadrant through exit portion 44. Subsequently, there is provided a horizontal floor portion 45 which ~ CA 02205452 1997-OS-12 is in communication with riser 46. In a manner similar to the previously described embodiment, there are also provided a plurality of U-shaped portions 47, the uppermost one of which terminates in an upwardly angled entry portion 48 in fluid communication with the lower right-hand quadrant of upper drum 14.
A similar arrangement is provided for the embodiment illustrated in Figure 9B.
The third tube profile is shown in Figures 10A and lOB and comprises tubes 60 and 60'. In this embodiment, tube 60, in a manner similar to tube 30, has an exit portion 49 communicating with an upwardly angled portion 50 which in turn communicates with a horizontal floor portion 51. A riser 52 extends between horizontal floor portion 51 and a further horizontal floor upper portion 53. Horizontal portion 53 extends inwardly to terminate in a U-shaped portion 54 which has a leg formed as an upwardly angled portion 55. Subsequently, in an arrangement similar to the previously described embodiments, there are provided a plurality of U-shaped portions 56, the uppermost one of which terminates in a upwardly angled portion 57 in fluid communication with upper drum 14 in its lower right-hand quadrant.
In a front portion of boiler 10 - i.e. adjacent front wall 16, the bent tube arrangement is such so as to provide alternating tubes 30 and 43. This arrangement continues for a substantial portion of the length of a boiler 12 while adjacent rear walls 18, one provides for alternating tubes of the type shown in Figures 8 and 10 - i.e. tubes 30 and tubes 60 are arranged in an alternating fashion. This creates a passageway for the gases to pass upwardly into the convection zone defined by the U-shaped portions of the tubes.
Boiler 10 utilizes a downcomer vertical conduit and downcomer horizontal conduit arrangement which forms a structural portion of the boiler and will now be described in greater detail.
Adjacent front wall 16, there is provided a front upper horizontal conduit 64 and a front lower horizontal conduit 66. Conduits 64 and 66 are in fluid communication with upper header 14 as indicated by the arrows. Similarly, downcomer 68 and 70 provide a flow path between front upper horizontal conduit 64 and front lower horizontal conduit 66; front lower horizontal conduit is in fluid communication with lower header 12 as may be best seen in Figures 13 and 14.
Proximate rear wall 18, and in a manner similar to that described with respect to the arrangement proximate front wall 16, there is provided a rear upper horizontal conduit 74 and a rear lower horizontal conduit 76. Rear upper horizontal conduit 74 is in fluid communication with upper header 14 while rear lower horizontal conduit 76 is in fluid communication with lower header 12. Downcomers 78 and 80 provide fluid communication between rear upper horizontal conduit 74 and 1_5 rear lower horizontal conduit 76.
The walls may be cooled by means of a plurality of riser tubes 84. Similarly, there may be provided a rear access opening 88 to boiler 12 and a plurality of cooling conduits 90 may be situated thereabout.
Similarly, burner port cooling conduits 94 may be provided in the manner illustrated in Figure 7B.
Boiler 10 may be enclosed by first side wall 98 having insulation 100 located adjacent thereto and a second side wall 102 having insulation 104 associated therewith.
The above embodiments provide a number of advantages wherein the downcomers are adjacent the front and rear walls and are shaped to contour the furnace and allow for a water cooled front and rear wall.
Apart from the downcomers providing a natural fluid circulation, they also serve as structural members to strengthen the boiler and provide a more rugged core. The possibility of having front end or rear water cooled walls can eliminate refractory maintenance and reduce boiler and low heat losses.
' CA 02205452 1997-OS-12 In one embodiment, there may be provided soot- blowing pipes 108 which extend longitudinally between the tubes where they meet at the center line.
It will be understood that the above described embodiment is for purposes of illustration only and that changes and modifications may be made thereto without departing from the spirit and scope of the invention.
It will be understood that the above described embodiment is for purposes of illustration only and that changes and modifications may be made thereto without departing from the spirit and scope of the invention.
Claims (13)
1. A boiler comprising a front wall, a rear wall, a pair of opposed side walls, a lower header, an upper header, a plurality of bent tubes extending between said lower header and said upper header and being in fluid communication therewith, a first upper horizontal conduit in fluid communication with said upper header, said first upper horizontal conduit being located proximate said front wall, a second upper horizontal conduit in fluid communication with said upper header, said second upper horizontal conduit being located proximate said rear wall, a first lower horizontal conduit in fluid communication with said lower header, said first lower horizontal conduit being located proximate said front wall, a second lower horizontal conduit in fluid communication with said lower header located proximate said rear wall, a first pair of downcomers, said first pair of downcomers being located adjacent said front wall and being in fluid communication with said first upper horizontal conduit and said first lower horizontal conduit, and a second pair of downcomers located adjacent said rear wall, said second pair of downcomers being in fluid communication between said second upper horizontal conduit and said second lower horizontal conduit, the arrangement being such that said horizontal conduits and said downcomers define a frame for said boiler.
2. The boiler of Claim 1 comprising a first sat and a second set of said bents tubes, said first set of bent tubes extending from a first side of said lower header, said second set of bent tubes extending from a second side of said lower header, said first set of bent tubes being a substantial mirror image of said second set of bent tubes.
3. The boiler of Claim 2 wherein said bent tubes include first profile bent tubes and second profile bent tubes, said first profile bent tubes and second profile bent tubes being arranged tangentially in an alternating manner.
4. The boiler of Claim 3 wherein said first profile bent tubes and said second profile bent tubes are arranged in a tangential alternating manner in a first boiler section adjacent said front wall, a plurality of third profile bent tubes, said first profile bent tubes and said third profile bent tubes, said first profile bent tubes and said third profile bent tubes being arranged in a non-tangential alternating manner in a second boiler section adjacent said mirror wall.
5. The boiler of Claim 4 wherein each of said bent tubes has a profile comprised of a first section exiting from said lower header, a horizontal floor section, a riser section extending vertically upwardly adjacent one of said side walls, a plurality of interconnected U-shaped sections extending between one of said side walls and a central vertical plane of said boiler, and an entry section extending between an uppermost of said U-shaped section and said upper header.
6. The boiler of Claim 5 further including a baffle located intermediate said U-shaped sections of said bent tubes.
7. The boiler of Claim 1 wherein each of said bent tubes has a profile comprised of;
a first section exiting from said lower header, a horizontal floor section, a riser section extending vertically upwardly adjacent one of said side walls, a plurality of interconnected U-shaped sections extending between one of said side walls and a central vertical plane of the boiler, and an entry section extending between an uppermost of said U-shaped sections and said upper header.
a first section exiting from said lower header, a horizontal floor section, a riser section extending vertically upwardly adjacent one of said side walls, a plurality of interconnected U-shaped sections extending between one of said side walls and a central vertical plane of the boiler, and an entry section extending between an uppermost of said U-shaped sections and said upper header.
8. The boiler of Claim 7 comprising a first set and a second set of said bent tubes, said first set of bent tubes extending from a first side of said lower header, said second set of bent tubes extending from a second side of said lower header, said first set of bent tubes being a substantial mirror image of said second set of bent tubes.
9. The boiler of Claim 7 wherein said bent tubes include first profile bent tubes and second profile bent tubes, said first profile bent tubes and said second profile bent tubes being arranged tangentially in an alternating manner.
10. The boiler of Claim 9 further including a plurality of a third profile bent tubes.
11. The boiler of Claim 10, wherein said first and second profile bent tubes are arranged in an alternating tangential manner in a first boiler section adjacent said front wall, said first profile bent tubes and third profile bent tubes being arranged in an alternating manner in a second boiler section adjacent said rear wall.
12. The boiler of Claim 7 further including a baffle located intermediate said U-shaped sections.
13. The boiler of Claim 7 further including a plurality of soot-blowing pipes located between said bent tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2205452 CA2205452C (en) | 1997-05-12 | 1997-05-12 | Boiler with downcomers forming part of support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2205452 CA2205452C (en) | 1997-05-12 | 1997-05-12 | Boiler with downcomers forming part of support structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2205452A1 CA2205452A1 (en) | 1998-11-12 |
| CA2205452C true CA2205452C (en) | 2007-01-16 |
Family
ID=4160658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2205452 Expired - Lifetime CA2205452C (en) | 1997-05-12 | 1997-05-12 | Boiler with downcomers forming part of support structure |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2205452C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10724734B2 (en) * | 2017-02-02 | 2020-07-28 | Superior Boiler, LLC | Multiple pass flexible water tube boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102679303B (en) * | 2012-05-17 | 2014-04-02 | 仲伟军 | Horizontal dual-drum energy-efficient boiler without fireproofing-material furnace-building process |
| TR201903277T4 (en) * | 2013-12-23 | 2019-03-21 | Thermodesign Inc | High temperature fluid generator. |
| US10197266B2 (en) * | 2014-06-12 | 2019-02-05 | Thermodesign, Inc. | Boiler system comprising an integrated economizer |
| CN104100961B (en) * | 2014-07-25 | 2016-02-03 | 仲伟军 | Horizontal coal-fired, biomass-burning chain-grate boiler |
| US11060717B2 (en) * | 2017-07-14 | 2021-07-13 | Superior Boiler, LLC | Multiple pass flexible water tube boiler and method of using same |
-
1997
- 1997-05-12 CA CA 2205452 patent/CA2205452C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10724734B2 (en) * | 2017-02-02 | 2020-07-28 | Superior Boiler, LLC | Multiple pass flexible water tube boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2205452A1 (en) | 1998-11-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20170512 |