US20060150874A1 - Furnace wall structure - Google Patents
Furnace wall structure Download PDFInfo
- Publication number
- US20060150874A1 US20060150874A1 US10/523,033 US52303305A US2006150874A1 US 20060150874 A1 US20060150874 A1 US 20060150874A1 US 52303305 A US52303305 A US 52303305A US 2006150874 A1 US2006150874 A1 US 2006150874A1
- Authority
- US
- United States
- Prior art keywords
- tubes
- furnace wall
- nose
- furnace
- header
- 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.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B29/00—Steam boilers of forced-flow type
- F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
- F22B29/061—Construction of tube walls
- F22B29/065—Construction of tube walls involving upper vertically disposed water tubes and lower horizontally- or helically disposed water tubes
-
- 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
- F22B37/22—Drums; Headers; Accessories therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B19/00—Water-tube boilers of combined horizontally-inclined type and vertical type, i.e. water-tube boilers of horizontally-inclined type having auxiliary water-tube sets in vertical or substantially vertical arrangement
-
- 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
- F22B37/62—Component parts or details of steam boilers specially adapted for steam boilers of forced-flow type
- F22B37/64—Mounting of, or supporting arrangements for, tube units
- F22B37/645—Mounting of, or supporting arrangements for, tube units involving upper vertically-disposed water tubes and lower horizontally- or helically disposed water tubes
Definitions
- the present invention relates to a furnace structure composed of a combustion chamber which is the steam generator of a boiler for thermal power generation, and more specifically, to the furnace wall structure of the furnace rear wall.
- FIG. 6 shows a simplified side view of the wall tubes forming the wall face of the furnace which composes the combustion chamber of a conventional boiler for thermal power generation.
- the combustion chamber of the boiler for thermal power generation is composed of a furnace wall 1 formed by arraying furnace wall tubes 2 a for conveying water, steam, or a fluid mixture of them at regular intervals, and welding these furnace wall tubes 2 a via membrane bars 3 disposed therebetween (See FIG. 2 ).
- the furnace wall 1 is provided with a furnace wall bottom part A composed of the furnace wall tubes 2 a having upward-spiraled fluid passages; a nose part C which has nose wall tubes 5 a disposed in a middle part of a furnace rear wall B adjoining the furnace wall bottom part A with a side view resembling a sidewise V ( ⁇ ); and a screen part D having screen tubes 7 .
- burners 4 provided for supplying fuel from outside for combustion, which are arrayed in each of the plural stages provided in the vertical direction at corresponding positions on the lower side of the front wall and rear wall of the gas flow of the furnace wall 1 . These burners 4 heat the fluid inside the furnace wall tubes 2 a and make it move upwards from the furnace wall bottom part A inside the inclined furnace wall tubes 2 a.
- the fluid heated by the burners 4 receives a different amount of heat depending on the arrayed position of the furnace wall tube 2 a provided for conveying the fluid, and on the positional relationship between the furnace wall tube 2 a and the burners 4 . Therefore, in order to make the amount of heat received by the fluid uniform, regardless of the arrayed position of the furnace wall tube 2 a and the positional relationship between the furnace wall tube 2 a and the burners 4 , the furnace wall tubes 2 a in the furnace wall bottom part A are upward-spiraled.
- Such a structure of the upward-spiraled furnace wall tubes 2 a of the conventional boilers for thermal power generation is disclosed in Japanese Published Unexamined Patent Application No. 2000-130701, paragraph [0027].
- FIG. 7 and FIG. 8 (as viewed from the direction of the lines II-II of FIG. 7 ) show a detailed structure of the connection part (hereinafter also referred to as the-transition part) between the spiral furnace wall tubes 2 a in the furnace rear wall, and the nose wall tubes 5 a and the screen tubes 7 .
- the connection part hereinafter also referred to as the-transition part
- the combustion gas G in the furnace rises from the furnace wall bottom part A; turns at the nose part C to the left side on the drawing; passes through the furnace ceiling part; and then flows towards an unillustrated furnace rear heat transfer part.
- the combustion gas G rises while making a detour in the upper part of the furnace wall 1 .
- the combustion gas G generated at the burners 4 region at the furnace wall bottom part A flows towards the right side on FIG. 6 ; passes through the furnace ceiling part; and flows towards the unillustrated furnace rear heat transfer part.
- the combustion gas G flows the shortest route in the furnace wall 1 in this manner, which shortens the retention time of the combustion gas G in the furnace, thereby making the combustion of the fuel insufficient.
- the shortened retention time of the combustion gas G in the furnace also makes the heat storing insufficient in the furnace wall tubes 2 a and the other heat transfer tube regions in the furnace, thereby causing high-temperature combustion gas G to flow to the furnace rear heat transfer part side.
- the high-temperature combustion gas G causes the heat transfer tubes arranged on the furnace rear heat transfer part to have clinkers or slag, which are difficult to remove after being hardened.
- the terminal parts of the spiral furnace wall tubes 2 a are positioned in the intermediate part of the nose part C composed of the nose wall tubes 5 a and others. Consequently, the header 6 for adjusting the number of tubes and mixing the inner fluid, which is required in the connection part (transition part) between the spirally inclined furnace wall tubes 2 a and the screen tubes 7 because of the difference in number between the furnace wall tubes 2 a and the nose wall tubes 5 a, is conventionally disposed inside the nose part C as shown in FIG. 7 .
- furnace wall tubes 2 b which extend upright from the inclined terminal parts of the furnace wall tubes 2 a whose fluid passages are upward-spiraled, are connected with the header 6 . Then the header makes the fluid flow towards the nose wall tubes 5 a. Between the header 6 and the nose wall tube 5 a are provided fluid passages 5 f for conveying the inner fluid downwards. The fluid passages 5 f are arranged in parallel with the vertical furnace wall tubes 2 b.
- the inclined terminal parts of the furnace wall tubes 2 a are directly connected with the screen tubes 7 , which are composed of thick tubes with higher rigidity than the furnace wall tubes 2 a so as to support the weight of the furnace wall bottom part A by a small number.
- the screen tubes 7 which are composed of thick tubes with higher rigidity than the furnace wall tubes 2 a so as to support the weight of the furnace wall bottom part A by a small number.
- the header 6 is provided to compensate for the difference in number between the furnace wall tubes 2 a and the nose wall tubes 5 a and to mix the inner fluid.
- the header 6 is installed inside the nose part C, and the inner fluid coming out of the header 6 flows through fluid passages 5 f into the nose wall tubes 5 a whose side views resembles a sidewise V ( ⁇ ).
- the reinforcing supports 8 must be installed in the screen tubes 7 that are directly connected with the spirally inclined furnace wall tubes 2 a, and such a complicated structure leads to a cost increase.
- the object of the present invention is to provide a furnace wall structure which can drain the water inside the nose wall tubes while the operation of the boiler is suspended, and also to provide a furnace wall structure which can dispense with the reinforcing supports for supporting the weight of the furnace wall bottom part.
- the present invention is a furnace wall structure having a furnace wall 1 installed in a furnace which is the combustion chamber of a boiler for thermal power generation, the furnace wall 1 comprising: a furnace wall bottom part A composed of furnace wall tubes 2 a having upward-spiraled fluid passages; a nose part C which has nose wall tubes 5 a disposed in a middle part of a furnace rear wall B adjoining the furnace wall bottom part A; and a screen part D having screen tubes 7 , wherein the terminal parts of the furnace wall tubes 2 a are located lower than the nose part C.
- the drain generated in the nose wall tubes 5 a while the operation of the boiler is suspended can naturally fall inside the furnace wall tubes 2 a located lower than the nose part C.
- the terminal parts of the furnace wall tubes 2 a are located lower than the nose part C, which makes the drain generated in the nose wall tubes 5 a naturally fall inside the header 6 .
- the header 6 can be installed lower than the nose part C and also outside the furnace wall 1 .
- the header 6 installed outside the furnace wall 1 facilitates draining operations from the header 6 and maintenance operations.
- furnace wall tubes 2 b ( 2 b 1 , 2 b 2 ) which extend upright from the terminal parts of the furnace wall tubes 2 a are provided so as to connect parts 2 b 1 of the furnace wall tubes 2 b directly with the header 6 , to connect the header 6 with the nose wall tubes 5 a via vertical tubes 5 e 1 and 5 e 2 ; and to connect other parts 2 b 2 of the furnace wall tubes 2 b directly with the screen tubes 7 , thereby integrating the vertical furnace wall tubes 2 b ( 2 b 1 , 2 b 2 ), the vertical tubes 5 e 1 and 5 e 2 , and the screen tubes 7 by being welded via membrane bars 3 .
- the terminal parts of the furnace wall tubes 2 a having the spirally inclined fluid passages are located lower than the nose part C, which makes it possible to provide the furnace wall tubes 2 b ( 2 b 1 , 2 b 2 ) extending upright between the terminal parts of the furnace wall tubes 2 a and the nose wall tubes 5 a.
- the parts 2 b 1 of the vertical furnace wall tubes 2 b are bent downwards to be connected with the header 6 ;
- horizontal tubes 5 b 1 and 5 b 2 are provided in such a manner as to be divided from the header 6 into opposite sides in the horizontal direction;
- the horizontal tubes 5 b 1 and 5 b 2 are connected with the vertical tubes 5 e 1 and 5 e 2 which partly extend upright adjacent to the vertical furnace wall tubes 2 b ( 2 b 1 , 2 b 2 ) via the vertical tubes 5 c 1 and 5 c 2 and the horizontal tubes 5 d 1 and 5 d 2 ;
- the vertical tubes 5 e 1 and 5 e 2 are connected with the nose wall tubes 5 a, respectively.
- connection tube group ( 5 b 1 , 5 b 2 to 5 e 1 , 5 e 2 ) consisting of the horizontal tubes 5 b 1 , 5 b 2 , 5 d 1 , and 5 d 2 , the vertical tubes 5 c 1 and 5 c 2 , and the vertical tubes 5 e 1 and 5 e 2 .
- the connection tube group ( 5 b 1 , 5 b 2 to 5 e 1 , 5 e 2 ) never causes drain retention, thereby making the drain from the nose wall tubes 5 a naturally fall into the header 6 quickly.
- the furnace wall 1 is suspended from the ceiling joist supported by a steel column, and the header 6 , which is also a heavy material, is also suspended from an adjacent ceiling joist via a spring arm.
- the furnace wall 1 moves downwards by several to several tens of centimeters by heat extension, and the spring arm can follow the heat extension of the header 6 in the vertical direction, but not the heat extension of the furnace wall 1 in the horizontal direction.
- connection tube group ( 5 b 1 , 5 b 2 to 5 e 1 , 5 e 2 ), particularly the portions having a side view of an inverted L formed by the vertical tubes 5 c 1 and 5 c 2 and the horizontal tubes 5 d 1 and 5 d 2 can absorb the heat extension of the furnace wall 1 in the horizontal direction.
- drain tubes 5 d at the bottom of the header 6 and to provide an open/close valve 10 at the drain tubes 5 d facilitate the draining from the header 6 .
- FIG. 1 shows a side view of the furnace wall structure of the embodiment of the present invention
- FIG. 2 is a perspective view of a part of the furnace wall structure of FIG. 1 ;
- FIG. 3 is a detailed side view of the furnace wall structure of FIG. 1 ;
- FIG. 4 is a view seen from the direction indicated by the arrows I, I of FIG. 3 ;
- FIG. 5 is an enlarged view of a part of FIG. 4 ;
- FIG. 6 is a side view of the conventional furnace wall structure
- FIG. 7 is a detailed side view of the conventional furnace wall structure.
- FIG. 8 is a perspective view taken along the line II-II of FIG. 7 .
- FIG. 1 to FIG. 5 An embodiment of the present invention will be described as follows with the drawings.
- the boiler furnace wall structure of the present embodiment is shown in FIG. 1 to FIG. 5 .
- FIG. 1 shows its simplified side view
- FIG. 2 shows a perspective view of a partly cut portion of the furnace wall structure
- FIG. 3 shows an enlarged side view of the transition part of the furnace wall tubes from the furnace wall tubes to the nose part
- FIG. 4 shows a view seen from the direction indicated by the arrows I and I of FIG. 3
- FIG. 5 is an enlarged view of a part of FIG. 4 .
- the furnace wall 1 shown in FIG. 1 is provided with a furnace wall bottom part A composed of furnace wall tubes 2 a having upward-spiraled fluid passages; a nose part C having nose wall tubes 5 a which is disposed in a middle part of a furnace rear wall B adjoining the furnace wall bottom part A; and an upper screen part D having screen tubes 7 .
- the terminal parts of the upward-spiraled furnace wall tubes 2 a are located lower than the nose part C having the nose wall tubes 5 a. Furthermore, the present embodiment employs a boiler structure where the header 6 for adjusting the number of tubes and mixing the inner fluid that is required because of the difference in number between the furnace wall tubes 2 a and the nose wall tubes 5 a is installed lower than the nose part C and also outside the furnace wall 1 .
- the terminal parts of the upward-spiraled furnace wall tubes 2 a are located lower than the nose part C; between the terminal parts of the furnace wall tubes 2 a and the nose part C are provided vertical furnace wall tubes 2 b ( 2 b 1 , 2 b 2 ) extending higher than the terminal parts of the furnace wall tubes 2 a; and the header 6 for adjusting the number of tubes and mixing the inner fluid that is required because of the difference in number between the furnace wall tubes 2 b ( 2 b 1 , 2 b 2 ) and the nose wall tubes 5 a is installed lower than the nose part C and also outside the furnace wall 1 .
- the parts 2 b 1 of the furnace wall tubes 2 b are bent downwards to be connected with the header 6 .
- horizontal tubes 5 b 1 and 5 b 2 which are divided from the header 6 into opposite sides in the horizontal direction, and which are connected with the vertical tubes 5 c 1 and 5 c 2 partly extending upright adjacent to the inclined furnace wall tubes 2 a.
- the vertical tubes 5 c 1 and 5 c 2 are connected, via the horizontal tubes 5 d 1 and 5 d 2 , with vertical tubes 5 e 1 and 5 e 2 , respectively which partly extend upright adjacent to the furnace wall tubes 2 b ( 2 b 1 , 2 b 2 ).
- the vertical tubes 5 e 1 and 5 e 2 are connected with the nose wall tubes 5 a whose side views look like a sidewise V ( ⁇ ).
- drain tubes 5 d at the bottom of the header 6 and the provision of an open/close valve 10 at the drain tubes 5 d facilitate the draining from the header 6 through the drain tubes 5 d.
- the screen tubes 7 are connected with the parts 2 b 2 Of the vertical furnace wall tubes 2 b adjoining the spiral furnace wall tubes 2 a, and are composed of comparatively thick tubes so as to support the weight of the furnace wall bottom part A.
- the terminal parts of the upward-spiraled furnace wall tubes 2 a are located lower than the nose part C, so that the header 6 that is required in the transition part because of the difference in number between the furnace wall tubes 2 a and the nose wall tubes 5 a can be installed lower than the nose part C and also outside the furnace wall 1 .
- This structure has the following effects.
- the present invention there is no accumulation of water which is the inner fluid inside the nose wall tubes 5 a while the operation of the boiler is suspended, which facilitates maintenance as compared with the conventional case. Furthermore, the reinforcing supports conventionally installed to support the weight of the furnace wall bottom part A become unnecessary, thereby relatively reducing the cost of equipment.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Combustion Of Fluid Fuel (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Paper (AREA)
Abstract
Description
- The present invention relates to a furnace structure composed of a combustion chamber which is the steam generator of a boiler for thermal power generation, and more specifically, to the furnace wall structure of the furnace rear wall.
-
FIG. 6 shows a simplified side view of the wall tubes forming the wall face of the furnace which composes the combustion chamber of a conventional boiler for thermal power generation. - The combustion chamber of the boiler for thermal power generation is composed of a
furnace wall 1 formed by arraying furnace wall tubes 2 a for conveying water, steam, or a fluid mixture of them at regular intervals, and welding these furnace wall tubes 2 avia membrane bars 3 disposed therebetween (SeeFIG. 2 ). - The
furnace wall 1 is provided with a furnace wall bottom part A composed of the furnace wall tubes 2 a having upward-spiraled fluid passages; a nose part C which hasnose wall tubes 5 a disposed in a middle part of a furnace rear wall B adjoining the furnace wall bottom part A with a side view resembling a sidewise V (<); and a screen part D havingscreen tubes 7. - There are also
plural burners 4 provided for supplying fuel from outside for combustion, which are arrayed in each of the plural stages provided in the vertical direction at corresponding positions on the lower side of the front wall and rear wall of the gas flow of thefurnace wall 1. Theseburners 4 heat the fluid inside the furnace wall tubes 2 a and make it move upwards from the furnace wall bottom part A inside the inclined furnace wall tubes 2 a. - The fluid heated by the
burners 4 receives a different amount of heat depending on the arrayed position of the furnace wall tube 2 a provided for conveying the fluid, and on the positional relationship between the furnace wall tube 2 a and theburners 4. Therefore, in order to make the amount of heat received by the fluid uniform, regardless of the arrayed position of the furnace wall tube 2 a and the positional relationship between the furnace wall tube 2 a and theburners 4, the furnace wall tubes 2 a in the furnace wall bottom part A are upward-spiraled. Such a structure of the upward-spiraled furnace wall tubes 2 a of the conventional boilers for thermal power generation is disclosed in Japanese Published Unexamined Patent Application No. 2000-130701, paragraph [0027]. -
FIG. 7 andFIG. 8 (as viewed from the direction of the lines II-II ofFIG. 7 ) show a detailed structure of the connection part (hereinafter also referred to as the-transition part) between the spiral furnace wall tubes 2 a in the furnace rear wall, and thenose wall tubes 5 a and thescreen tubes 7. - The combustion gas G in the furnace, as shown in
FIG. 6 , rises from the furnace wall bottom part A; turns at the nose part C to the left side on the drawing; passes through the furnace ceiling part; and then flows towards an unillustrated furnace rear heat transfer part. Thus, the combustion gas Grises while making a detour in the upper part of thefurnace wall 1. In contrast, if the nose part C is absent, the combustion gas G generated at theburners 4 region at the furnace wall bottom part A flows towards the right side onFIG. 6 ; passes through the furnace ceiling part; and flows towards the unillustrated furnace rear heat transfer part. Without the nose part C, the combustion gas G flows the shortest route in thefurnace wall 1 in this manner, which shortens the retention time of the combustion gas G in the furnace, thereby making the combustion of the fuel insufficient. The shortened retention time of the combustion gas G in the furnace also makes the heat storing insufficient in the furnace wall tubes 2 a and the other heat transfer tube regions in the furnace, thereby causing high-temperature combustion gas G to flow to the furnace rear heat transfer part side. The high-temperature combustion gas G causes the heat transfer tubes arranged on the furnace rear heat transfer part to have clinkers or slag, which are difficult to remove after being hardened. - This makes it necessary to provide the nose part C which must have a complicated tubing structure. The terminal parts of the spiral furnace wall tubes 2 a are positioned in the intermediate part of the nose part C composed of the
nose wall tubes 5 a and others. Consequently, theheader 6 for adjusting the number of tubes and mixing the inner fluid, which is required in the connection part (transition part) between the spirally inclined furnace wall tubes 2 a and thescreen tubes 7 because of the difference in number between the furnace wall tubes 2 a and thenose wall tubes 5 a, is conventionally disposed inside the nose part C as shown inFIG. 7 . - Other furnace wall tubes 2 b, which extend upright from the inclined terminal parts of the furnace wall tubes 2 a whose fluid passages are upward-spiraled, are connected with the
header 6. Then the header makes the fluid flow towards thenose wall tubes 5 a. Between theheader 6 and thenose wall tube 5 a are provided fluid passages 5 f for conveying the inner fluid downwards. The fluid passages 5 f are arranged in parallel with the vertical furnace wall tubes 2 b. - In the transition part, the inclined terminal parts of the furnace wall tubes 2 a are directly connected with the
screen tubes 7, which are composed of thick tubes with higher rigidity than the furnace wall tubes 2 a so as to support the weight of the furnace wall bottom part A by a small number. However, it is impossible to transfer the weight of the furnace wall bottom part A to thescreen tubes 7 only by the furnace wall tubes 2 a with insufficient rigidity. Therefore, there are reinforcingsupports 8 provided between the furnace wall tubes 2 a and thescreen tubes 7 in order to compensate for the rigidity of the furnace wall tubes 2 a and to transfer the weight of the furnace wall bottom part A to thescreen tubes 7. - According to the aforementioned prior art, since the terminal parts of the spirally inclined furnace wall tubes 2 a are located in the intermediate part of the nose part C, the
header 6 is provided to compensate for the difference in number between the furnace wall tubes 2 a and thenose wall tubes 5 a and to mix the inner fluid. Theheader 6 is installed inside the nose part C, and the inner fluid coming out of theheader 6 flows through fluid passages 5 f into thenose wall tubes 5 a whose side views resembles a sidewise V (<). - Thus in the conventional furnace wall structure, the water inside the fluid passages 5 f located lower than the
header 6 cannot be drained while the operation of the boiler is suspended. - Furthermore, according to the prior art, the
reinforcing supports 8 must be installed in thescreen tubes 7 that are directly connected with the spirally inclined furnace wall tubes 2 a, and such a complicated structure leads to a cost increase. - The object of the present invention is to provide a furnace wall structure which can drain the water inside the nose wall tubes while the operation of the boiler is suspended, and also to provide a furnace wall structure which can dispense with the reinforcing supports for supporting the weight of the furnace wall bottom part.
- The present invention is a furnace wall structure having a
furnace wall 1 installed in a furnace which is the combustion chamber of a boiler for thermal power generation, thefurnace wall 1 comprising: a furnace wall bottom part A composed of furnace wall tubes 2 a having upward-spiraled fluid passages; a nose part C which hasnose wall tubes 5 a disposed in a middle part of a furnace rear wall B adjoining the furnace wall bottom part A; and a screen part D havingscreen tubes 7, wherein the terminal parts of the furnace wall tubes 2 a are located lower than the nose part C. - Since the terminal parts of the furnace wall tubes 2 a are located lower than the nose part C, the drain generated in the
nose wall tubes 5 a while the operation of the boiler is suspended can naturally fall inside the furnace wall tubes 2 a located lower than the nose part C. - Also, in a case where the
header 6 is connected with the terminal parts of the furnace wall tubes 2 a, the terminal parts of the furnace wall tubes 2 a are located lower than the nose part C, which makes the drain generated in thenose wall tubes 5 a naturally fall inside theheader 6. - Furthermore, the
header 6 can be installed lower than the nose part C and also outside thefurnace wall 1. In this case, theheader 6 installed outside thefurnace wall 1 facilitates draining operations from theheader 6 and maintenance operations. - It is also possible that furnace wall tubes 2 b (2 b 1, 2 b 2) which extend upright from the terminal parts of the furnace wall tubes 2 a are provided so as to connect parts 2 b 1 of the furnace wall tubes 2 b directly with the
header 6, to connect theheader 6 with thenose wall tubes 5 a via vertical tubes 5 e 1 and 5 e 2; and to connect other parts 2 b 2 of the furnace wall tubes 2 b directly with thescreen tubes 7, thereby integrating the vertical furnace wall tubes 2 b (2 b 1, 2 b 2), the vertical tubes 5 e 1 and 5 e 2, and thescreen tubes 7 by being welded viamembrane bars 3. - Thus, in the present invention, the terminal parts of the furnace wall tubes 2 a having the spirally inclined fluid passages are located lower than the nose part C, which makes it possible to provide the furnace wall tubes 2 b (2 b 1, 2 b 2) extending upright between the terminal parts of the furnace wall tubes 2 a and the
nose wall tubes 5 a. This enables the parts 2 b 2 of the furnace wall tubes 2 b to be directly connected with thescreen tubes 7 so as to integrate the vertical furnace wall tubes 2 b (2 b 1, 2 b 2), the vertical tubes 5 e 1 and 5 e 2, and thescreen tubes 7 by being welded via themembrane bars 3, thereby supporting the weight of the furnace wall bottom part A without using reinforcing members. - It is also possible that the
parts 2 b 1 of the vertical furnace wall tubes 2 b are bent downwards to be connected with theheader 6; horizontal tubes 5 b 1 and 5 b 2 are provided in such a manner as to be divided from theheader 6 into opposite sides in the horizontal direction; the horizontal tubes 5 b 1 and 5 b 2 are connected with the vertical tubes 5 e 1 and 5 e 2 which partly extend upright adjacent to the vertical furnace wall tubes 2 b (2 b 1, 2 b 2) via the vertical tubes 5 c 1 and 5 c 2 and the horizontal tubes 5 d 1 and 5 d 2; and the vertical tubes 5 e 1 and 5 e 2 are connected with thenose wall tubes 5 a, respectively. - Thus, the
header 6 and thenose wall tubes 5 a are connected with each other via a connection tube group (5 b 1, 5 b 2 to 5 e 1, 5 e 2) consisting of the horizontal tubes 5 b 1, 5 b 2, 5 d 1, and 5 d 2, the vertical tubes 5 c 1 and 5 c 2, and the vertical tubes 5 e 1 and 5 e 2. The connection tube group (5 b 1, 5 b 2to 5 e 1, 5 e 2) never causes drain retention, thereby making the drain from thenose wall tubes 5 a naturally fall into theheader 6 quickly. - Although it is not illustrated, the
furnace wall 1 is suspended from the ceiling joist supported by a steel column, and theheader 6, which is also a heavy material, is also suspended from an adjacent ceiling joist via a spring arm. Thefurnace wall 1 moves downwards by several to several tens of centimeters by heat extension, and the spring arm can follow the heat extension of theheader 6 in the vertical direction, but not the heat extension of thefurnace wall 1 in the horizontal direction. However, the connection tube group (5 b 1, 5 b 2 to 5 e 1, 5 e 2), particularly the portions having a side view of an inverted L formed by the vertical tubes 5 c 1 and 5 c 2 and the horizontal tubes 5 d 1 and 5 d 2 can absorb the heat extension of thefurnace wall 1 in the horizontal direction. - To provide drain tubes 5 d at the bottom of the
header 6 and to provide an open/close valve 10 at the drain tubes 5 d facilitate the draining from theheader 6. -
FIG. 1 shows a side view of the furnace wall structure of the embodiment of the present invention; -
FIG. 2 is a perspective view of a part of the furnace wall structure ofFIG. 1 ; -
FIG. 3 is a detailed side view of the furnace wall structure ofFIG. 1 ; -
FIG. 4 is a view seen from the direction indicated by the arrows I, I ofFIG. 3 ; -
FIG. 5 is an enlarged view of a part ofFIG. 4 ; -
FIG. 6 is a side view of the conventional furnace wall structure; -
FIG. 7 is a detailed side view of the conventional furnace wall structure; and -
FIG. 8 is a perspective view taken along the line II-II ofFIG. 7 . - An embodiment of the present invention will be described as follows with the drawings. The boiler furnace wall structure of the present embodiment is shown in
FIG. 1 toFIG. 5 . - Concerning the boiler furnace wall structure of the present embodiment,
FIG. 1 shows its simplified side view;FIG. 2 shows a perspective view of a partly cut portion of the furnace wall structure;FIG. 3 shows an enlarged side view of the transition part of the furnace wall tubes from the furnace wall tubes to the nose part; andFIG. 4 shows a view seen from the direction indicated by the arrows I and I ofFIG. 3 .FIG. 5 is an enlarged view of a part ofFIG. 4 . - The
furnace wall 1 shown inFIG. 1 is provided with a furnace wall bottom part A composed of furnace wall tubes 2 a having upward-spiraled fluid passages; a nose part C havingnose wall tubes 5 a which is disposed in a middle part of a furnace rear wall B adjoining the furnace wall bottom part A; and an upper screen part D havingscreen tubes 7. - In the
furnace wall 1 of the present embodiment, the terminal parts of the upward-spiraled furnace wall tubes 2 a are located lower than the nose part C having thenose wall tubes 5 a. Furthermore, the present embodiment employs a boiler structure where theheader 6 for adjusting the number of tubes and mixing the inner fluid that is required because of the difference in number between the furnace wall tubes 2 a and thenose wall tubes 5 a is installed lower than the nose part C and also outside thefurnace wall 1. - As shown in
FIG. 3 toFIG. 5 , the terminal parts of the upward-spiraled furnace wall tubes 2 a are located lower than the nose part C; between the terminal parts of the furnace wall tubes 2 a and the nose part C are provided vertical furnace wall tubes 2 b (2 b 1, 2 b 2) extending higher than the terminal parts of the furnace wall tubes 2 a; and theheader 6 for adjusting the number of tubes and mixing the inner fluid that is required because of the difference in number between the furnace wall tubes 2 b (2 b 1, 2 b 2) and thenose wall tubes 5 a is installed lower than the nose part C and also outside thefurnace wall 1. The parts 2 b 1 of the furnace wall tubes 2 b are bent downwards to be connected with theheader 6. Furthermore, there are horizontal tubes 5 b 1 and 5 b 2 which are divided from theheader 6 into opposite sides in the horizontal direction, and which are connected with the vertical tubes 5 c 1 and 5 c 2 partly extending upright adjacent to the inclined furnace wall tubes 2 a. The vertical tubes 5 c 1 and 5 c 2 are connected, via the horizontal tubes 5 d 1 and 5 d 2, with vertical tubes 5 e 1 and 5 e 2, respectively which partly extend upright adjacent to the furnace wall tubes 2 b (2 b 1, 2 b 2). The vertical tubes 5 e 1 and 5 e 2 are connected with thenose wall tubes 5 a whose side views look like a sidewise V (<). - The provision of drain tubes 5 d at the bottom of the
header 6 and the provision of an open/close valve 10 at the drain tubes 5 d facilitate the draining from theheader 6 through the drain tubes 5 d. - The
screen tubes 7 are connected with the parts 2 b 2 Of the vertical furnace wall tubes 2 b adjoining the spiral furnace wall tubes 2 a, and are composed of comparatively thick tubes so as to support the weight of the furnace wall bottom part A. - In the furnace wall structure of the present embodiment, the terminal parts of the upward-spiraled furnace wall tubes 2 a are located lower than the nose part C, so that the
header 6 that is required in the transition part because of the difference in number between the furnace wall tubes 2 a and thenose wall tubes 5 a can be installed lower than the nose part C and also outside thefurnace wall 1. This structure has the following effects. - (1) It becomes possible to provide, in the connection part between the
header 6 and thenose wall tubes 5 a, wall tubes (the vertical tubes 5 c 1 and 5 c 2 and the vertical tubes 5 e 1 and 5 e 2) extending upright to make the inner fluid flow upwards, so that the water inside thenose wall tubes 5 a can naturally fall to theheader 6 while the operation of the boiler is suspended. - (2) Locating the terminal parts of the upward-spiraled furnace wall tubes 2 a lower than the nose part C enables upright extended at the connection part between the spiral furnace wall tubes 2 a and the
screen tubes 7, the furnace wall tubes 2 b 1 are connected with theheader 6, and theheader 6 is connected with thenose wall tubes 5 a via the vertical tubes 5 e 1 and 5 e 2 so as to integrate the vertical tubes 5 e 1 and 5 e 2, thescreen tubes 7, and the vertical furnace wall tubes 2 b 1 and 2 b 2 by being welded via the membrane bars 3, thereby supporting the weight of the furnace wall bottom part A. - (3) The provision of the drain tubes 5 d at the bottom of the
header 6 and the provision of the open/close valve 10 at the drain tubes 5 d facilitate the draining from theheader 6 by operating the open/close valve 10 installed outside thefurnace wall 1, and also facilitates the maintenance operation of theheader 6 and the adjacent tube group from outside thefurnace wall 1. - According to the present invention, there is no accumulation of water which is the inner fluid inside the
nose wall tubes 5 a while the operation of the boiler is suspended, which facilitates maintenance as compared with the conventional case. Furthermore, the reinforcing supports conventionally installed to support the weight of the furnace wall bottom part A become unnecessary, thereby relatively reducing the cost of equipment.
Claims (5)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-263449 | 2002-09-09 | ||
JP2002263449 | 2002-09-09 | ||
PCT/JP2003/011425 WO2004023037A1 (en) | 2002-09-09 | 2003-09-08 | Furnace wall structure |
Publications (2)
Publication Number | Publication Date |
---|---|
US7073451B1 US7073451B1 (en) | 2006-07-11 |
US20060150874A1 true US20060150874A1 (en) | 2006-07-13 |
Family
ID=31973186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/523,033 Expired - Lifetime US7073451B1 (en) | 2002-09-09 | 2003-09-08 | Furnace wall structure |
Country Status (9)
Country | Link |
---|---|
US (1) | US7073451B1 (en) |
EP (1) | EP1544540B1 (en) |
JP (1) | JP3934139B2 (en) |
KR (1) | KR100687389B1 (en) |
CN (1) | CN1277067C (en) |
AU (1) | AU2003261991B2 (en) |
CA (1) | CA2498262C (en) |
DE (1) | DE60325393D1 (en) |
WO (1) | WO2004023037A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090087805A1 (en) * | 2006-03-14 | 2009-04-02 | Babcock-Hitachi Kabushiki Kaisha | In-Furnace Gas Injection Port |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006005208A1 (en) * | 2006-02-02 | 2007-08-16 | Hitachi Power Europe Gmbh | Hanging steam generator |
EP2213936A1 (en) | 2008-11-10 | 2010-08-04 | Siemens Aktiengesellschaft | Continuous-flow steam generator |
DE102010038885B4 (en) * | 2010-08-04 | 2017-01-19 | Siemens Aktiengesellschaft | Once-through steam generator |
CN103620332B (en) * | 2012-03-28 | 2015-09-02 | 新日铁住金株式会社 | The protecting wall structure of molten metal container and the furnace wall construction method of molten metal container |
JP6958373B2 (en) * | 2018-01-17 | 2021-11-02 | 栗田工業株式会社 | Boiler chemical cleaning method |
CN108534118B (en) * | 2018-03-30 | 2023-10-31 | 东方电气集团东方锅炉股份有限公司 | Water-cooled wall structure of supercritical or ultra-supercritical once-through boiler |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US864973A (en) * | 1904-09-26 | 1907-09-03 | Dubuque Harness And Saddlery Company | Manufacture of harness-pads. |
US2719210A (en) * | 1953-06-10 | 1955-09-27 | Combustion Eng | Method of welding thin walled tubes from a single side |
US3434460A (en) * | 1966-11-30 | 1969-03-25 | Combustion Eng | Multicircuit recirculation system for vapor generating power plant |
US3927646A (en) * | 1965-04-13 | 1975-12-23 | Babcock & Wilcox Co | Vapor generator |
US4075979A (en) * | 1975-12-19 | 1978-02-28 | Kraftwerk Union Aktiengesellschaft | Assembly of a combustion chamber nose in a continuous-flow boiler having a two-section construction with gas-tightly welded walls |
US4864973A (en) * | 1985-01-04 | 1989-09-12 | The Babcock & Wilcox Company | Spiral to vertical furnace tube transition |
US5950574A (en) * | 1996-12-17 | 1999-09-14 | Babcock-Hitachi Kabushiki Kaisha | Boiler |
US6651596B1 (en) * | 1997-05-09 | 2003-11-25 | Siemens Aktiengesellschaft | Continous flow steam generator having a double-flue construction |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6123004U (en) * | 1984-07-12 | 1986-02-10 | 川崎重工業株式会社 | boiler header |
JPS6123004A (en) | 1984-07-12 | 1986-01-31 | Fuji Facom Corp | Automatic warehouse system |
JP3916784B2 (en) | 1998-10-26 | 2007-05-23 | バブコック日立株式会社 | Boiler structure |
JP2000186801A (en) * | 1998-12-21 | 2000-07-04 | Ishikawajima Harima Heavy Ind Co Ltd | Piping structure for scissors |
-
2003
- 2003-09-08 CN CNB03821332XA patent/CN1277067C/en not_active Expired - Fee Related
- 2003-09-08 AU AU2003261991A patent/AU2003261991B2/en not_active Expired
- 2003-09-08 US US10/523,033 patent/US7073451B1/en not_active Expired - Lifetime
- 2003-09-08 CA CA002498262A patent/CA2498262C/en not_active Expired - Lifetime
- 2003-09-08 DE DE60325393T patent/DE60325393D1/en not_active Expired - Lifetime
- 2003-09-08 JP JP2004534190A patent/JP3934139B2/en not_active Expired - Lifetime
- 2003-09-08 KR KR1020057003979A patent/KR100687389B1/en active IP Right Grant
- 2003-09-08 WO PCT/JP2003/011425 patent/WO2004023037A1/en active Application Filing
- 2003-09-08 EP EP03794282A patent/EP1544540B1/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US864973A (en) * | 1904-09-26 | 1907-09-03 | Dubuque Harness And Saddlery Company | Manufacture of harness-pads. |
US2719210A (en) * | 1953-06-10 | 1955-09-27 | Combustion Eng | Method of welding thin walled tubes from a single side |
US3927646A (en) * | 1965-04-13 | 1975-12-23 | Babcock & Wilcox Co | Vapor generator |
US3434460A (en) * | 1966-11-30 | 1969-03-25 | Combustion Eng | Multicircuit recirculation system for vapor generating power plant |
US4075979A (en) * | 1975-12-19 | 1978-02-28 | Kraftwerk Union Aktiengesellschaft | Assembly of a combustion chamber nose in a continuous-flow boiler having a two-section construction with gas-tightly welded walls |
US4864973A (en) * | 1985-01-04 | 1989-09-12 | The Babcock & Wilcox Company | Spiral to vertical furnace tube transition |
US5950574A (en) * | 1996-12-17 | 1999-09-14 | Babcock-Hitachi Kabushiki Kaisha | Boiler |
US6651596B1 (en) * | 1997-05-09 | 2003-11-25 | Siemens Aktiengesellschaft | Continous flow steam generator having a double-flue construction |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090087805A1 (en) * | 2006-03-14 | 2009-04-02 | Babcock-Hitachi Kabushiki Kaisha | In-Furnace Gas Injection Port |
Also Published As
Publication number | Publication date |
---|---|
EP1544540B1 (en) | 2008-12-17 |
KR20050057273A (en) | 2005-06-16 |
EP1544540A1 (en) | 2005-06-22 |
AU2003261991B2 (en) | 2006-05-18 |
US7073451B1 (en) | 2006-07-11 |
JPWO2004023037A1 (en) | 2005-12-22 |
EP1544540A4 (en) | 2005-11-16 |
WO2004023037A1 (en) | 2004-03-18 |
CA2498262C (en) | 2008-03-18 |
CN1682077A (en) | 2005-10-12 |
KR100687389B1 (en) | 2007-02-26 |
CN1277067C (en) | 2006-09-27 |
AU2003261991A1 (en) | 2004-03-29 |
DE60325393D1 (en) | 2009-01-29 |
CA2498262A1 (en) | 2004-03-18 |
JP3934139B2 (en) | 2007-06-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN100554860C (en) | Tube spacer, its manufacture method and use the heat exchanger of this separator | |
US7073451B1 (en) | Furnace wall structure | |
US4075979A (en) | Assembly of a combustion chamber nose in a continuous-flow boiler having a two-section construction with gas-tightly welded walls | |
US4638857A (en) | Vertical tube heat exchanger panel for waste-recovery boilers such as black liquid boilers or household waste incinerator furnaces, and methods of manufacture | |
RU2067722C1 (en) | Water-tube boiler | |
KR100444497B1 (en) | Continuous steam generator | |
JP5119720B2 (en) | boiler | |
RU2317484C2 (en) | Parallel current flow steam generator and method of manufacture of parallel current flow steam generator | |
RU2193729C2 (en) | Boiler | |
KR840001100B1 (en) | Steam generator arrangement | |
KR102408191B1 (en) | Boiler | |
JP2008267687A (en) | Auxiliary boiler | |
EP0052939A1 (en) | Water-tube boiler | |
JPH11241802A (en) | Connecting structure for furnace wall tube and rising tube | |
JPH05141608A (en) | Soda recovery boiler | |
US425941A (en) | Boiler with vertical sections | |
US5730087A (en) | Tube enclosure and floor support routing for once through steam generators | |
JP2002081608A (en) | Boiler structure | |
JP2001056104A (en) | Oxygen combustion once-through boiler | |
JPH08312904A (en) | Boiler | |
JPH10122503A (en) | Structure of rear wall part of furnace for boiler | |
SU1255835A1 (en) | Cooled element of oven walls | |
KR100566967B1 (en) | Boiler | |
JPH09318042A (en) | Boiler device | |
EA032077B1 (en) | Water-heating boiler |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BABCOCK-HITACHI KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKAMOTO, TOSHIHIKO;MATSUDA, JUNICHIRO;FURUKAWA, ATSUSHI;REEL/FRAME:016894/0814 Effective date: 20050112 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
AS | Assignment |
Owner name: MITSUBISHI HITACHI POWER SYSTEMS, LTD., JAPAN Free format text: MERGER;ASSIGNOR:BABCOCK-HITACHI K.K.;REEL/FRAME:035003/0333 Effective date: 20141001 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553) Year of fee payment: 12 |