US3844254A - Furnace having walls defined by tube membranes - Google Patents
Furnace having walls defined by tube membranes Download PDFInfo
- Publication number
- US3844254A US3844254A US00366115A US36611573A US3844254A US 3844254 A US3844254 A US 3844254A US 00366115 A US00366115 A US 00366115A US 36611573 A US36611573 A US 36611573A US 3844254 A US3844254 A US 3844254A
- Authority
- US
- United States
- Prior art keywords
- tube
- membranes
- corner
- furnace
- water
- 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 - Lifetime
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Classifications
-
- 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
- F22B37/36—Arrangements for sheathing or casing boilers
-
- 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
- F22B37/107—Protection of water tubes
- F22B37/108—Protection of water tube walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
Definitions
- corner tubes are free from the adjacent membranes, but are retained thereto by means of special clamping means.
- furnaces With certain types of furnaces the risk of explosions or forceful puffs of combustion gases is imminent. So is for instance the case with different types of refuse and waste combustion furnaces, especially furnaces for the combustion of waste liquor from the cellulose pulp manufacture. During the combustion of such liquor a chemical residue is formed at the bottom of the hearth, and if water from a cracked tube comes into contact with this residue a forceful explosion will occur, which will deform the walls and may result in more tubes being cracked.
- Furnaces of this type are often designed with a quadrilateral cross section, and the damages are most likely to occur near the corners of the furnace.
- the membranes are fitted at an angle to the tube forming the corner, and if the walls, following an explosion, are bent outwards the attachments at the corner tube will be heavily stressed, which easily will lead to a cracking of some tube, or tubes.
- the furnace is therefore designed in such a manner, that a tube located at each corner of the furnace is free from the adjacent membranes and is connected to the latter by means of clamps arranged externally of the walls and adapted for securing the blocks to the walls, said clamp at the pertaining corner tube extending to each direction therefrom at least over the outermost tube in the adjacent membrane.
- the drawing shows by way of example a corner portion of a furnace belonging to a waste liquor combustion plant.
- the walls of the furnace are composed of a number of water tubes 10, which within each side wall of the furnace are welded together to membranes.
- the faces of the tubes turned towards the furnace are covered by blocks 11 of fire resistant material, which are forced towards the tubes by means of wedge shaped members 12. These are retained at the wall by means of clamps I3 and bolts 14.
- two membranes arranged at an angle to each other and meeting each other at a corner are not interconnected directly by welding, but are locked together by means of a separate tube 15, which forms part of the water circulation system, but is not welded to either of the membranes.
- Tube 15 is, however, connected to the adjacent membranes by means of the clamps 13 used for retaining the wedge shaped members 12 at the corner portion.
- clamps 13 are designed in such a manner that they from the corner tube extend over at least one, preferably over two tubes in the adjacent membrane.
- the walls of big furnaces may each contain more than one membrane, so a single unit does not extend from one corner tube to the other.
- shape of the blocks and of the wedge members, as well as of the clamps is not limited to the examples shown in the drawing, but will have to be suited to the actual application.
- the essential part is that the corner tubes are free from the membranes, and that the clamps at the corners have sufficient length to provide the required strength.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Paper (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The furnace of a waste liquor recovery furnace is often defined by water tube membranes. The chemical residue formed as a result of the combustion is likely to react forcibly when mixed with water, and every caution should be taken in the design to avoid the risk of tube leaks. The corner connection between two wall membranes is difficult to arrange, and if a strong combustion puff should occur the weld seams at the corner tube may cause a leak from which water could gush into the molten residues causing an explosion. To avoid this risk the corner tubes are free from the adjacent membranes, but are retained thereto by means of special clamping means.
Description
United States Patent [191 Astrom Oct. 29, 1974 [5 FURNACE HAVING WALLS DEFINED BY 2,368,265 1/1945 Shellenberger 122/6 A TUBE MEMBRANES 3,404,663 10/1968 Lewis et al 122/367 R Inventor: Ingmar Astrom, Stenungsund,
Sweden Gotaverkens Angtekniska AB (Gotaverken Heat Engineering Co., Ltd.), Goteborg, Sweden Filed: June 1, 1973 Appl. No.: 366,115
Assignee:
Foreign Application Priority Data June 19, 1972 Sweden 8035/72 U.S. Cl. 122/6 A, 122/235 A Int. Cl. F22b 37/00 Field of Search 122/6 A, 235 A, 7; 110/98 References Cited UNITED STATES PATENTS 8/1934 Toomey 122/6 A 12/1935 Selaya 122/6 A Primary Examiner-Kenneth W. Sprague Assistant Examiner-Larry l. Schwartz Attorney, Agent, or FirmPierce, Scheffler & Parker [5 7 ABSTRACT The furnace of a waste liquor recovery furnace is often defined by water tube membranes. The chemical residue formed as a result of the combustion is likely to react forcibly when mixed with water, and every caution should be taken in the design to avoid the risk of tube leaks.
The corner connection between two wall membranes is difficult to arrange, and if a strong combustion puff should occur the weld seams at the comer tube may cause a leak from which water could gush into the molten residues causing an explosion.
To avoid this risk the corner tubes are free from the adjacent membranes, but are retained thereto by means of special clamping means.
1 Claim, 1 Drawing Figure FURNACE HAVING WALLS DEFINED BY TUBE MEMBRANES BACKGROUND OF THE INVENTION The furnaces of many combustion plants nowadays often have walls consisting of tube membranes, i.e., spaced water tubes interconnected by means of fins or similar members welded together to form a flat unit. The tubes of these membranes are often covered by some protecting cladding, which may consist of a fire resistant compound stamped onto the wall, or of blocks of fire and corrosion resistant material in any suitable manner attached to the wall.
With certain types of furnaces the risk of explosions or forceful puffs of combustion gases is imminent. So is for instance the case with different types of refuse and waste combustion furnaces, especially furnaces for the combustion of waste liquor from the cellulose pulp manufacture. During the combustion of such liquor a chemical residue is formed at the bottom of the hearth, and if water from a cracked tube comes into contact with this residue a forceful explosion will occur, which will deform the walls and may result in more tubes being cracked.
SUMMARY OF THE INVENTION Furnaces of this type are often designed with a quadrilateral cross section, and the damages are most likely to occur near the corners of the furnace. The membranes are fitted at an angle to the tube forming the corner, and if the walls, following an explosion, are bent outwards the attachments at the corner tube will be heavily stressed, which easily will lead to a cracking of some tube, or tubes. According to the invention the furnace is therefore designed in such a manner, that a tube located at each corner of the furnace is free from the adjacent membranes and is connected to the latter by means of clamps arranged externally of the walls and adapted for securing the blocks to the walls, said clamp at the pertaining corner tube extending to each direction therefrom at least over the outermost tube in the adjacent membrane.
BRIEF DESCRIPTION OF THE DRAWING The drawing shows by way of example a corner portion of a furnace belonging to a waste liquor combustion plant.
DESCRIPTION OF THE PREFERRED EMBODIMENT The walls of the furnace are composed of a number of water tubes 10, which within each side wall of the furnace are welded together to membranes. The faces of the tubes turned towards the furnace are covered by blocks 11 of fire resistant material, which are forced towards the tubes by means of wedge shaped members 12. These are retained at the wall by means of clamps I3 and bolts 14.
According to the invention two membranes arranged at an angle to each other and meeting each other at a corner are not interconnected directly by welding, but are locked together by means of a separate tube 15, which forms part of the water circulation system, but is not welded to either of the membranes. Tube 15 is, however, connected to the adjacent membranes by means of the clamps 13 used for retaining the wedge shaped members 12 at the corner portion. These clamps are designed in such a manner that they from the corner tube extend over at least one, preferably over two tubes in the adjacent membrane.
It is evident that the walls of big furnaces may each contain more than one membrane, so a single unit does not extend from one corner tube to the other. It is further evident that the shape of the blocks and of the wedge members, as well as of the clamps is not limited to the examples shown in the drawing, but will have to be suited to the actual application. The essential part is that the corner tubes are free from the membranes, and that the clamps at the corners have sufficient length to provide the required strength.
What I claim is:
I. In a steam boiler furnace having parallel water tubes interconnected by welding to form tube membranes, said membranes being assembled to define a combustion chamber having quadrilateral cross section and being provided, at their faces turned towards the combustion chamber, with blocks of fire-resistant material secured by clamping means located outside the wall,
the improvement of a water tube located at each corner of the combustion chamber, said tube lacking permanent connection of the adjacent tube membranes;
block retaining clamping means extending over the pertaining corner tube and at least the outermost tube in each of the adjacent tube membranes thereby locking said corner tube to said adjacent membranes; and
web-shaped blocks of fire-resistant material secured by said block-retaining clamping means to the faces of said corner tubes turned toward said chamber.
Claims (1)
1. In a steam boiler furnace having parallel water tubes interconnected by welding to form tube membranes, said membranes being assembled to define a combustion chamber having quadrilateral cross section and being provided, at their faces turned towards the combustion chamber, with blocks of fireresistant material secured by clamping means located outside the wall, the improvement of a water tube located at each corner of the combustion chamber, said tube lacking permanent connection of the adjacent tube membranes; block retaining clamping means extending over the pertaining corner tube and at least the outermost tube in each of the adjacent tube membranes thereby locking said corner tube to said adjacent membranes; and web-shaped blocks of fire-resistant material secured by said block-retaining clamping means to the faces of said corner tubes turned toward said chamber.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE08035/72A SE364104B (en) | 1972-06-19 | 1972-06-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3844254A true US3844254A (en) | 1974-10-29 |
Family
ID=20272962
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00366115A Expired - Lifetime US3844254A (en) | 1972-06-19 | 1973-06-01 | Furnace having walls defined by tube membranes |
Country Status (8)
Country | Link |
---|---|
US (1) | US3844254A (en) |
JP (1) | JPS571748B2 (en) |
CA (1) | CA988370A (en) |
DE (1) | DE2328943A1 (en) |
FI (1) | FI54023C (en) |
FR (1) | FR2190251A5 (en) |
GB (1) | GB1428418A (en) |
SE (1) | SE364104B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5012767A (en) * | 1989-10-03 | 1991-05-07 | Leighton Industries, Inc. | Heat exchanger tube spacers |
US5542378A (en) * | 1994-06-02 | 1996-08-06 | Saint-Gobain/Norton Industrial Ceramics Corp. | Waterwall tube block design |
CN109028010A (en) * | 2018-07-11 | 2018-12-18 | 哈尔滨锅炉厂有限责任公司 | Sliding positioning device and tube panel pipe localization method for tube panel |
US11022342B2 (en) * | 2018-06-26 | 2021-06-01 | Noritz Corporation | Heat exchanger and water heater including same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4961761A (en) * | 1989-08-18 | 1990-10-09 | Foster Wheeler Energy Corporation | Cyclone separator wall refractory material system |
JPH0471359U (en) * | 1990-11-02 | 1992-06-24 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1970585A (en) * | 1931-08-11 | 1934-08-21 | Fuller Lehigh Co | Furnace |
US2022830A (en) * | 1930-05-21 | 1935-12-03 | American Eng Co Ltd | Fluid-cooled wall structure |
US2368265A (en) * | 1940-07-27 | 1945-01-30 | Babcock & Wilcox Co | Furnace wall |
US3404663A (en) * | 1965-12-29 | 1968-10-08 | Combustion Eng | Prevention of furnace corrosion |
-
1972
- 1972-06-19 SE SE08035/72A patent/SE364104B/xx unknown
-
1973
- 1973-05-31 GB GB2591773A patent/GB1428418A/en not_active Expired
- 1973-06-01 US US00366115A patent/US3844254A/en not_active Expired - Lifetime
- 1973-06-04 CA CA173,132A patent/CA988370A/en not_active Expired
- 1973-06-06 DE DE2328943A patent/DE2328943A1/en active Pending
- 1973-06-14 JP JP6646373A patent/JPS571748B2/ja not_active Expired
- 1973-06-15 FR FR7321978A patent/FR2190251A5/fr not_active Expired
- 1973-06-19 FI FI1982/73A patent/FI54023C/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2022830A (en) * | 1930-05-21 | 1935-12-03 | American Eng Co Ltd | Fluid-cooled wall structure |
US1970585A (en) * | 1931-08-11 | 1934-08-21 | Fuller Lehigh Co | Furnace |
US2368265A (en) * | 1940-07-27 | 1945-01-30 | Babcock & Wilcox Co | Furnace wall |
US3404663A (en) * | 1965-12-29 | 1968-10-08 | Combustion Eng | Prevention of furnace corrosion |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5012767A (en) * | 1989-10-03 | 1991-05-07 | Leighton Industries, Inc. | Heat exchanger tube spacers |
US5542378A (en) * | 1994-06-02 | 1996-08-06 | Saint-Gobain/Norton Industrial Ceramics Corp. | Waterwall tube block design |
CN1117946C (en) * | 1994-06-02 | 2003-08-13 | 圣戈本陶瓷及塑料股份有限公司 | Novel water wall tube block design |
US11022342B2 (en) * | 2018-06-26 | 2021-06-01 | Noritz Corporation | Heat exchanger and water heater including same |
CN109028010A (en) * | 2018-07-11 | 2018-12-18 | 哈尔滨锅炉厂有限责任公司 | Sliding positioning device and tube panel pipe localization method for tube panel |
Also Published As
Publication number | Publication date |
---|---|
DE2328943A1 (en) | 1974-01-10 |
CA988370A (en) | 1976-05-04 |
JPS4956467A (en) | 1974-05-31 |
FI54023C (en) | 1978-09-11 |
JPS571748B2 (en) | 1982-01-12 |
FI54023B (en) | 1978-05-31 |
FR2190251A5 (en) | 1974-01-25 |
SE364104B (en) | 1974-02-11 |
GB1428418A (en) | 1976-03-17 |
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