EP2735790B1 - Tower boiler - Google Patents
Tower boiler Download PDFInfo
- Publication number
- EP2735790B1 EP2735790B1 EP12817946.2A EP12817946A EP2735790B1 EP 2735790 B1 EP2735790 B1 EP 2735790B1 EP 12817946 A EP12817946 A EP 12817946A EP 2735790 B1 EP2735790 B1 EP 2735790B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- furnace wall
- heat transfer
- superheater
- boiler
- bottom portion
- 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.)
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- 239000011295 pitch Substances 0.000 claims description 27
- 239000000567 combustion gas Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000446 fuel Substances 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000001272 nitrous oxide Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
- F22G7/06—Steam superheaters characterised by location, arrangement, or disposition in furnace tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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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
- F22B21/40—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 arranged in a comparatively long vertical shaft, i.e. tower 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
- F22G1/02—Steam superheating characterised by heating method with heat supply by hot flue gases from the furnace of the steam boiler
Definitions
- a tower type boiler is a boiler that is suitable for being installed in a limited space.
- An example thereof is the tower type boiler disclosed in Patent document 1.
- This tower type boiler is provided with a boiler main body, a burner that injects fuel into the interior of the boiler main body and burns this fuel, and a heat transfer section that performs a heat exchange with the combustion gas that is generated as a result of the fuel being injected from the burner into the interior of the boiler main body and burned therein.
- a reduction in the size of this boiler i.e., in the surface area occupied by this boiler
- the heat transfer section for example, the superheaters are provided with a long heat transfer pipe that is folded back and forth several times so as to form a pipe bundle, and the greater the adjacent pitch between the heat transfer pipes (i.e., the greater the distance between mutually adjacent heat transfer pipes) in this bundled state, the greater the volume of the superheater becomes. Because the size of the superheaters directly affects the size of the boiler, in a conventional tower type boiler, superheaters (i.e., a heat transfer section) having the narrowest possible adjacent pitch are employed.
- Patent document 1 Japanese Patent Application, First Publication No. H09-243004
- the tower type boiler disclosed in the aforementioned Patent document 1 is a tower type boiler that is capable of generating steam in high-steam conditions (i.e., high-temperature, high-pressure conditions) with the purpose of improving plant efficiency, then the fuel input quantity is reduced thanks to the improvement in plant efficiency, however, as well as this, the flow rate of the steam that is supplied from the tower type boiler to the turbine is reduced.
- the water supply flow rate is reduced, this results in the temperature of the water or steam that is flowing through the furnace wall pipes increasing compared with a tower type boiler in conventional steam conditions.
- the amount of heat recovered by the water supply heater is increased in order to further improve the plant efficiency. In such cases, the temperature of the water supply that is introduced into the boiler increases, and the temperature of the water or steam flowing through the furnace wall pipes further increases.
- the present invention was conceived in view of the above-described problems in the conventional technology, and it is an object thereof to provide a tower type boiler that is able to generate steam under high-steam conditions with the purpose of improving plant efficiency without having to use materials that are able to withstand high-temperature steam for the furnace walls.
- GB524052A , FR2131549A5 , GB497208A and GB546763A disclose tower type boilers according to the pre-characterizing portion of Claim 1.
- the invention is in the boiler of Claim 1.
- the amount of heat that is absorbed by the furnace walls in which the plurality of furnace wall pipes in the bottom portion of the furnace wall have been arranged running in a vertical direction is relatively small, and the steam temperature inside the pipes in the top portion of the furnace wall is kept low.
- combustion gas whose gas temperature exceeds the melting point of the ash is introduced into the superheater that is located closest to the bottom side of the furnace wall. Accordingly, if the adjacent pitch between heat transfer pipes in this superheater is set to a narrow value, blockages in the superheater that are caused by the ash becoming adhered to the heat transfer pipe may be concerned. In contrast, if the adjacent pitch between heat transfer pipes in this superheater is set to a wide value, then it is inevitable that the size of the boiler will have to be increased.
- the adjacent pitch between heat transfer pipes in the superheater that is located closest to the bottom side of the furnace wall is set to a value that prevents blockages caused by the ash and also avoids any increase in the boiler size. For example, if combustion gas having a temperature of approximately 1600 °C that has been generated by combustion is to be cooled to below approximately 1200 °C, which is the melting point of the ash, before it is introduced into the superheater that is located on the side further away from the bottom portion of the furnace wall, then it is desirable for the adjacent pitch between heat transfer pipes to be between 1000 and 2000 mm. In this case, the adjacent pitch between heat transfer pipes in the superheater that is located on the side further away from the bottom portion of the furnace wall is roughly between 600 and 700 mm
- the tower type boiler by employing the above-described structure, it is possible to perform operations under high-steam conditions with the purpose of improving plant efficiency without having to use materials that are able to withstand high-temperature steam for the furnace walls, namely, without having to alter the material currently being used for the furnace walls.
- FIG. 1 shows an embodiment of the tower type boiler according to the present invention.
- this tower type boiler 1 is provided with a furnace wall 3 that forms a boiler main body 2, a burner 4 that injects fuel into the interior of the boiler main body 2 and burns this fuel, and a heat transfer section that performs a heat exchange with combustion gas G that is generated as a result of the fuel being injected from the burner 4 into the interior of the boiler main body 2 and burned therein.
- the heat exchange with the combustion gas G is performed by a furnace wall bottom portion 3a and a furnace wall top portion 3b that are located respectively in a lower portion and an upper portion of the boiler main body 2.
- the heat transfer section is located within a top portion flow path 10 that is surrounded by the furnace wall top portion 3b of the boiler main body 2, and this heat transfer section is provided with a plurality of superheaters 5 to 8, a reheater 9, and an economizer (not shown).
- the combustion gas G is made to flow through the heat transfer section inside the top portion flow path 10, namely, the combustion gas G is made to flow to the superheaters 7, 6, and 8, the reheater 9, the superheater 5, and the economizer and to perform a heat exchange therewith, and the combustion gas G after this heat exchange is introduced to a nitrous oxide removal catalyst of a nitrous oxide removal system and an exhaust gas processing device of a desulfurization apparatus and the like that are located further downstream so that components of sulfur compounds and nitrogen compounds and the like are removed therefrom.
- the combustion gas G is then discharged into the atmosphere.
- Respective heat transfer pipes 11 that make up the superheater 7 that is positioned closest to the furnace wall bottom portion 3a side out of the plurality of superheaters 5 to 8 and that is exposed to the flames F, and the heat transfer pipes 11 that make up the superheater 6 that is positioned on the downstream side of the superheater 7 are folded back and forth several times so as to form a pipe bundle. Furthermore, as is shown in the enlarged portion in FIG. 1 , adjacent pitches Pw between the respective heat transfer pipes 11 making up these superheaters 6 and 7 are set wider than the pitches Pn between the heat transfer pipes 11 making up the superheater 8 which is positioned on the side away from the furnace wall bottom portion 3a.
- the superheater 8 which is positioned on the side away from the furnace wall bottom portion 3a, namely, the superheater 8 which has the narrow adjacent pitch Pn between the heat transfer pipes 11.
- the superheater 7 which is positioned closest to the furnace wall bottom portion 3a side and which is exposed to the flames F, and the superheater 6 which is adjacent to the superheater 7, namely, the superheaters 6 and 7 which have the wide adjacent pitch Pw between the heat transfer pipes 11 also perform the role of heat transfer surfaces that lower the temperature of the combustion gas G.
- the amount of heat to be absorbed by the furnace wall bottom portion 3a in which a plurality of furnace wall pipes (not shown) are arranged in upper and lower directions is reduced, and the steam temperature inside the furnace wall pipes in the furnace wall top portion 3b of the boiler main body 2 can be kept to a low value.
- FIG. 2 shows another embodiment of a tower type boiler according to the present invention.
- a tower type boiler 21 according to this embodiment differs from the tower type boiler 1 according to the previous embodiment in that, as is shown by the enlarged portion in FIG. 2 , adjacent pitches Pw, Pm, and Pn between the respective heat transfer pipes 11 are set so as to become sequentially narrower as they are positioned away from the furnace wall bottom portion 3a between the superheater 7, which, out of the plurality of superheaters 5 to 8, is positioned closest to the furnace wall bottom portion 3a, and the superheater 8, which is positioned the furthest away therefrom.
- the remaining structure of the tower type boiler 21 is the same as that of the tower type boiler 1 according to the previous embodiment.
- the structure of the tower type boiler according to the present invention is not limited to the structures of the tower type boilers according to the above-described embodiments, and as another structure it is also possible, for example, to change the adjacent pitches between the heat transfer pipes 11 within the superheater 6 that is positioned next to the superheater 7, which is positioned closest to the furnace wall bottom portion 3a. It is also possible to change the adjacent pitches Pw, Pm, and Pn between each of the heat transfer pipes 11 from the superheater 7, which is positioned closest to the furnace wall bottom portion 3a, to the superheater 8, which is positioned the furthest away therefrom, such that they become gradually narrower as they are positioned away from the furnace wall bottom portion 3a.
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- 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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
Description
- A tower type boiler is a boiler that is suitable for being installed in a limited space. An example thereof is the tower type boiler disclosed in Patent document 1.
- This tower type boiler is provided with a boiler main body, a burner that injects fuel into the interior of the boiler main body and burns this fuel, and a heat transfer section that performs a heat exchange with the combustion gas that is generated as a result of the fuel being injected from the burner into the interior of the boiler main body and burned therein. A reduction in the size of this boiler (i.e., in the surface area occupied by this boiler) can be achieved by placing superheaters, a reheater, and an economizer that make up the heat transfer section on a top portion of a box-shaped furnace wall.
- The heat transfer section, for example, the superheaters are provided with a long heat transfer pipe that is folded back and forth several times so as to form a pipe bundle, and the greater the adjacent pitch between the heat transfer pipes (i.e., the greater the distance between mutually adjacent heat transfer pipes) in this bundled state, the greater the volume of the superheater becomes. Because the size of the superheaters directly affects the size of the boiler, in a conventional tower type boiler, superheaters (i.e., a heat transfer section) having the narrowest possible adjacent pitch are employed.
- In this manner, if superheaters having a narrow adjacent pitch are employed, then not only is it possible to obtain highly efficient heat transfers, but the size of the boiler can also be reduced. However, when a combustion gas that contains ash is introduced into a superheater having a narrow adjacent pitch, then if the temperature of the combustion gas exceeds the melting point of the ash, the ash becomes adhered to the heat transfer pipe and the fluidity of the combustion gas is constricted by the amount that the adjacent pitch of the heat transfer pipe is narrowed. As a result, effective heat transfer becomes impossible.
- In this type of conventional tower type boiler, in order to avoid a situation in which ash becomes blocked between mutually adjacent heat transfer pipes in a superheater, the surface area of the heat transfer surface (i.e., of the furnace wall in which a number of furnace wall pipes have been arranged in a vertical direction) as far as the superheater that is closest to the bottom portion of the furnace wall is increased so as to absorb a suitable amount of heat. By doing this, the temperature of the combustion gas that is introduced into the superheaters is prevented from exceeding the melting point of the ash.
- [Patent document 1] Japanese Patent Application, First Publication No.
H09-243004 - If the tower type boiler disclosed in the aforementioned Patent document 1 is a tower type boiler that is capable of generating steam in high-steam conditions (i.e., high-temperature, high-pressure conditions) with the purpose of improving plant efficiency, then the fuel input quantity is reduced thanks to the improvement in plant efficiency, however, as well as this, the flow rate of the steam that is supplied from the tower type boiler to the turbine is reduced. In other words, because the water supply flow rate is reduced, this results in the temperature of the water or steam that is flowing through the furnace wall pipes increasing compared with a tower type boiler in conventional steam conditions. Moreover, there are also cases in which the amount of heat recovered by the water supply heater is increased in order to further improve the plant efficiency. In such cases, the temperature of the water supply that is introduced into the boiler increases, and the temperature of the water or steam flowing through the furnace wall pipes further increases.
- On the other hand, in a tower type boiler that is used in high-steam conditions as well, as is described above, it is essential for the temperature of the combustion gas that is introduced into the superheater that is closest to a bottom of the furnace wall to be lowered to less than the melting point of the ash. Because of this, it is not possible to reduce the surface area of the heat transfer surface of a bottom portion of the furnace wall, and to lower the temperature of the water or steam that is flowing through the furnace wall pipe.
- In other words, when the water flowing through the interior of the furnace wall pipes in the furnace wall has changed to high-temperature water or steam in the furnace wall, because it rises towards a drum or separator that is placed in the top portion of the boiler main body, the steam temperature inside the pipes in the top portion of the furnace wall becomes extremely high and there is a possibility of failure of the materials the pipe occurring.
- In this case, even if a material that is able to withstand high-temperature steam, for example, if a 7CrMoVTiB10-10 composition, known as T24, is used for the furnace wall at the top portion of the boiler main body, it is difficult with current welding technology for this material to be used to form a furnace wall. Accordingly, for the operation that is performed under high-steam conditions, technology is desired that will prevent the steam temperature inside the pipe at the top portion of the furnace wall from becoming too hot.
- The present invention was conceived in view of the above-described problems in the conventional technology, and it is an object thereof to provide a tower type boiler that is able to generate steam under high-steam conditions with the purpose of improving plant efficiency without having to use materials that are able to withstand high-temperature steam for the furnace walls.
-
GB524052A FR2131549A5 GB497208A GB546763A - The invention is in the boiler of Claim 1.
- Preferred features are set out in the dependent claims.
- In the tower type boiler of the present invention, prior to combustion gas that contains ash being introduced into a superheater that has narrow adjacent pitches between its heat transfer pipes and that is located on the further side from the furnace wall bottom portion, it is necessary for the temperature of this combustion gas to be lowered to less than the melting point of the ash. For this reason, the superheater that is located on the side that is closest to the bottom portion of the furnace wall, namely, the superheater having a wide adjacent pitch between its heat transfer pipes performs the role of a heat transfer surface that lowers the temperature of the combustion gas. Accordingly, the amount of heat that is absorbed by the furnace walls in which the plurality of furnace wall pipes in the bottom portion of the furnace wall have been arranged running in a vertical direction is relatively small, and the steam temperature inside the pipes in the top portion of the furnace wall is kept low.
- In this case, when the respective adjacent pitches between heat transfer pipes in the plurality of superheaters become sequentially narrower in each superheater as they are positioned away from the bottom portion of the furnace wall, then in each superheater, not only is it possible to avoid blockages caused by the ash and to prevent the size of the boiler becoming too large, but it also becomes possible to achieve highly efficient heat exchange.
- In the tower type boiler of the present invention, combustion gas whose gas temperature exceeds the melting point of the ash is introduced into the superheater that is located closest to the bottom side of the furnace wall. Accordingly, if the adjacent pitch between heat transfer pipes in this superheater is set to a narrow value, blockages in the superheater that are caused by the ash becoming adhered to the heat transfer pipe may be concerned. In contrast, if the adjacent pitch between heat transfer pipes in this superheater is set to a wide value, then it is inevitable that the size of the boiler will have to be increased.
- Accordingly, the adjacent pitch between heat transfer pipes in the superheater that is located closest to the bottom side of the furnace wall is set to a value that prevents blockages caused by the ash and also avoids any increase in the boiler size. For example, if combustion gas having a temperature of approximately 1600 °C that has been generated by combustion is to be cooled to below approximately 1200 °C, which is the melting point of the ash, before it is introduced into the superheater that is located on the side further away from the bottom portion of the furnace wall, then it is desirable for the adjacent pitch between heat transfer pipes to be between 1000 and 2000 mm. In this case, the adjacent pitch between heat transfer pipes in the superheater that is located on the side further away from the bottom portion of the furnace wall is roughly between 600 and 700 mm
- In the tower type boiler according to the present invention, by employing the above-described structure, it is possible to perform operations under high-steam conditions with the purpose of improving plant efficiency without having to use materials that are able to withstand high-temperature steam for the furnace walls, namely, without having to alter the material currently being used for the furnace walls.
-
-
FIG. 1 is a schematic view showing from the side an embodiment of a tower type boiler according to the present invention. -
FIG. 2 is a schematic view showing from the side another embodiment of the tower type boiler according to the present invention. - Hereinafter, the tower type boiler of the present invention will be described based on the drawings.
-
FIG. 1 shows an embodiment of the tower type boiler according to the present invention. - As is shown in
FIG. 1 , this tower type boiler 1 is provided with afurnace wall 3 that forms a boilermain body 2, aburner 4 that injects fuel into the interior of the boilermain body 2 and burns this fuel, and a heat transfer section that performs a heat exchange with combustion gas G that is generated as a result of the fuel being injected from theburner 4 into the interior of the boilermain body 2 and burned therein. The heat exchange with the combustion gas G is performed by a furnacewall bottom portion 3a and a furnacewall top portion 3b that are located respectively in a lower portion and an upper portion of the boilermain body 2. The heat transfer section is located within a topportion flow path 10 that is surrounded by the furnacewall top portion 3b of the boilermain body 2, and this heat transfer section is provided with a plurality ofsuperheaters 5 to 8, a reheater 9, and an economizer (not shown). - In this tower type boiler 1, the combustion gas G is made to flow through the heat transfer section inside the top
portion flow path 10, namely, the combustion gas G is made to flow to thesuperheaters superheater 5, and the economizer and to perform a heat exchange therewith, and the combustion gas G after this heat exchange is introduced to a nitrous oxide removal catalyst of a nitrous oxide removal system and an exhaust gas processing device of a desulfurization apparatus and the like that are located further downstream so that components of sulfur compounds and nitrogen compounds and the like are removed therefrom. The combustion gas G is then discharged into the atmosphere. - Respective
heat transfer pipes 11 that make up thesuperheater 7 that is positioned closest to the furnacewall bottom portion 3a side out of the plurality ofsuperheaters 5 to 8 and that is exposed to the flames F, and theheat transfer pipes 11 that make up thesuperheater 6 that is positioned on the downstream side of thesuperheater 7 are folded back and forth several times so as to form a pipe bundle. Furthermore, as is shown in the enlarged portion inFIG. 1 , adjacent pitches Pw between the respectiveheat transfer pipes 11 making up thesesuperheaters heat transfer pipes 11 making up thesuperheater 8 which is positioned on the side away from the furnacewall bottom portion 3a. - As has been described above, in the tower type boiler 1 according to this embodiment, it is necessary to lower the temperature of the combustion gas G to less than the melting point of ash before this combustion gas G is introduced into the
superheater 8 which is positioned on the side away from the furnacewall bottom portion 3a, namely, thesuperheater 8 which has the narrow adjacent pitch Pn between theheat transfer pipes 11. For this reason, thesuperheater 7 which is positioned closest to the furnacewall bottom portion 3a side and which is exposed to the flames F, and thesuperheater 6 which is adjacent to thesuperheater 7, namely, thesuperheaters heat transfer pipes 11 also perform the role of heat transfer surfaces that lower the temperature of the combustion gas G. - Accordingly, the amount of heat to be absorbed by the furnace
wall bottom portion 3a in which a plurality of furnace wall pipes (not shown) are arranged in upper and lower directions is reduced, and the steam temperature inside the furnace wall pipes in the furnace walltop portion 3b of the boilermain body 2 can be kept to a low value. - In this manner, in the tower type boiler 1 of this embodiment, even if the amount of heat that is input into the boiler
main body 2 is increased, it is still possible to keep the steam temperature within the furnace wall pipes in the furnace walltop portion 3b of the boilermain body 2 at a low level. Because of this, it is possible to perform operations under high-steam conditions with the purpose of improving the plant efficiency without having to use a material for the furnacewall top portion 3b that is able to withstand high-temperature steam, for example, without having to use a 7CrMoVTiB10-10 composition, known as T24, namely, by instead using a furnace wall material that is currently in use, for example, by using a 13CrMo4-5 material known as T12. -
FIG. 2 shows another embodiment of a tower type boiler according to the present invention. - As is shown in
FIG. 2 , atower type boiler 21 according to this embodiment differs from the tower type boiler 1 according to the previous embodiment in that, as is shown by the enlarged portion inFIG. 2 , adjacent pitches Pw, Pm, and Pn between the respectiveheat transfer pipes 11 are set so as to become sequentially narrower as they are positioned away from the furnacewall bottom portion 3a between thesuperheater 7, which, out of the plurality ofsuperheaters 5 to 8, is positioned closest to the furnacewall bottom portion 3a, and thesuperheater 8, which is positioned the furthest away therefrom. The remaining structure of thetower type boiler 21 is the same as that of the tower type boiler 1 according to the previous embodiment. - In this manner, if the adjacent pitches Pw, Pm, and Pn between each of the
heat transfer pipes 11 from thesuperheater 7, which is positioned closest to the furnacewall bottom portion 3a, to thesuperheater 8, which is positioned the furthest away therefrom, are set so as to become gradually narrower as they are positioned away from the furnacewall bottom portion 3a, then in each of thesuperheaters - The structure of the tower type boiler according to the present invention is not limited to the structures of the tower type boilers according to the above-described embodiments, and as another structure it is also possible, for example, to change the adjacent pitches between the
heat transfer pipes 11 within thesuperheater 6 that is positioned next to thesuperheater 7, which is positioned closest to the furnacewall bottom portion 3a. It is also possible to change the adjacent pitches Pw, Pm, and Pn between each of theheat transfer pipes 11 from thesuperheater 7, which is positioned closest to the furnacewall bottom portion 3a, to thesuperheater 8, which is positioned the furthest away therefrom, such that they become gradually narrower as they are positioned away from the furnacewall bottom portion 3a. - While preferred embodiments of the invention have been described and illustrated above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention as claimed.
- In this tower type boiler, it is possible to perform operations under high-steam conditions with the purpose of improving plant efficiency without having to alter the material currently being used for the furnace walls.
-
- 1, 21 ... Tower type boilers,
- 2 ... Boiler main body,
- 3 ... Furnace wall,
- 3a ... Furnace wall bottom portion,
- 3b ... Furnace wall top portion,
- 5∼8 ... Superheaters (Heat transfer sections),
- 9 ... Reheater (Heat transfer section),
- 11 ... Heat transfer pipes,
- G ... Combustion gas,
- Pn ... adjacent pitch between heat transfer pipes in the superheater that is located further away from the furnace wall bottom portion,
- Pw ... adjacent pitch between heat transfer pipes in the superheater that is located closest to the furnace wall bottom portion,
- Pm ... adjacent pitch between heat transfer pipes in the superheater that is located between the superheater that is located the furthest away from the furnace wall bottom portion and the superheater that is located closest to the furnace wall bottom portion
Claims (3)
- A tower type boiler comprising:a furnace wall (3) that forms a boiler main body (2) and that performs a heat exchange with combustion gas (G) that is generated inside this boiler main body (2); anda heat transfer section (5, 6, 7, 8, 9) that is positioned at a top portion (3b) of the boiler main body (2) and that performs a heat exchange with the combustion gas (G) that is generated within the boiler main body (2), whereinthe heat transfer section (5, 6, 7, 8, 9) is provided with a plurality of superheaters (5, 6, 7, 8), whereinthe furnace wall (3) has a number of furnace wall pipes arranged in a vertical direction, and has a box-shape, and whereinthe heat transfer section (5, 6, 7, 8, 9) is located within the furnace wall, the tower type boiler is characterized in thatan adjacent pitch (Pw) between heat transfer pipes (11) in at least the superheater (7) from among the plurality of superheaters (6, 7, 8) that is located closest to the furnace wall bottom portion (3a), the furnace wall bottom portion (3a) being located in a lower portion of the boiler main body (2), and that is exposed to the flames (F) from a burner (4), is set wider than an adjacent pitch (Pn) between heat transfer pipes (11) in that superheater (8) that is located further away from the furnace wall bottom portion (3a).
- The tower type boiler according to claim 1, wherein the respective adjacent pitches (Pw, Pn) between the heat transfer pipes (11) in the plurality of superheaters (5, 6, 7, 8) become gradually narrower in each superheater (5, 6, 7, 8) as they are positioned away from the furnace wall bottom portion (3a).
- The tower type boiler according to claim 1, wherein the heat transfer section (5, 6, 7, 8, 9) is located within a top portion flow path (10) that is surrounded by a furnace wall top portion (3b) located in an upper portion of the boiler main body (2), and
the superheater (7) that is located closest to the furnace wall bottom portion (3a) is located above the furnace wall bottom portion (3a).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011160529 | 2011-07-22 | ||
PCT/JP2012/067118 WO2013015088A1 (en) | 2011-07-22 | 2012-07-04 | Tower boiler |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2735790A1 EP2735790A1 (en) | 2014-05-28 |
EP2735790A4 EP2735790A4 (en) | 2015-04-15 |
EP2735790B1 true EP2735790B1 (en) | 2021-01-13 |
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ID=47600943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12817946.2A Active EP2735790B1 (en) | 2011-07-22 | 2012-07-04 | Tower boiler |
Country Status (3)
Country | Link |
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EP (1) | EP2735790B1 (en) |
JP (1) | JP5692385B2 (en) |
WO (1) | WO2013015088A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB497208A (en) * | 1937-07-21 | 1938-12-14 | Fried Krupp Germaniawerft Ag | Improvements in or relating to water tube boilers |
GB524052A (en) * | 1938-01-21 | 1940-07-29 | Babcock & Wilcox Ltd | Improvements in or relating to water tube boilers with superheaters |
GB546763A (en) * | 1941-03-28 | 1942-07-29 | Babcock & Wilcox Ltd | Improvements in tubulous boilers |
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DE2144847A1 (en) * | 1971-09-03 | 1973-03-15 | Kawasaki Heavy Ind Ltd | HEATING SURFACE OF A FLUE GAS BOILER FOR METAL FRESH OVEN |
JPS63243603A (en) * | 1987-03-30 | 1988-10-11 | バブコツク日立株式会社 | Shifter among heat transfer tube group |
JPH02178502A (en) * | 1988-12-29 | 1990-07-11 | Hirakawa Tekkosho:Kk | Boiler with water tube group |
JPH09243004A (en) | 1996-03-06 | 1997-09-16 | Ishikawajima Harima Heavy Ind Co Ltd | Tower boiler |
JP2001227883A (en) * | 2000-02-17 | 2001-08-24 | Babcock Hitachi Kk | Heat exchanger |
CN101042058B (en) * | 2007-04-27 | 2011-12-07 | 冯伟忠 | Novel steam-electric generating set |
US8511258B2 (en) * | 2007-05-09 | 2013-08-20 | Hitachi, Ltd. | Coal boiler and coal boiler combustion method |
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2012
- 2012-07-04 JP JP2013525645A patent/JP5692385B2/en active Active
- 2012-07-04 WO PCT/JP2012/067118 patent/WO2013015088A1/en active Application Filing
- 2012-07-04 EP EP12817946.2A patent/EP2735790B1/en active Active
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Also Published As
Publication number | Publication date |
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JPWO2013015088A1 (en) | 2015-02-23 |
EP2735790A1 (en) | 2014-05-28 |
EP2735790A4 (en) | 2015-04-15 |
WO2013015088A1 (en) | 2013-01-31 |
JP5692385B2 (en) | 2015-04-01 |
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