阅读说明：本技术 锅炉装置 (Boiler device ) 是由 山下登敏 山口达也 川上俊弘 栗栖功至 于 2019-10-21 设计创作，主要内容包括：提供一种能抑制一次再热器与二次再热器的中间部的炉宽方向上的蒸汽温度差,并且能降低建筑物高度的锅炉装置。锅炉装置(1)具备包括一次再热器(9)和二次再热器(10)的再热器,将一次再热器(9)的出口歧管(12)分成从炉宽方向的中央部朝向左侧壁延伸的左侧出口歧管(13)和从炉宽方向的中央部朝向右侧壁延伸的右侧出口歧管(14),在将左侧出口歧管(13)经由第一连结管(15)结合于入口歧管(16)的右端部,并且将右侧出口歧管(14)经由第二连结管(17)结合于入口歧管(16)的左端部的基础上,将该左侧出口歧管(13)和右侧出口歧管(14)以大致相同的高度在前后方向上错开位置地配置。(Provided is a boiler device which can suppress a steam temperature difference in the width direction between the intermediate portions of a primary reheater and a secondary reheater and can reduce the height of a building. A boiler device (1) is provided with a reheater comprising a primary reheater (9) and a secondary reheater (10), wherein an outlet manifold (12) of the primary reheater (9) is divided into a left outlet manifold (13) extending from the center in the width direction toward the left side wall and a right outlet manifold (14) extending from the center in the width direction toward the right side wall, the left outlet manifold (13) is joined to the right end of an inlet manifold (16) via a first connecting pipe (15), the right outlet manifold (14) is joined to the left end of the inlet manifold (16) via a second connecting pipe (17), and the left outlet manifold (13) and the right outlet manifold (14) are arranged in a staggered manner so as to be substantially equal in height in the front-rear direction.)

1. A boiler device is provided with: a furnace to burn fuel; a reheater disposed in a combustion gas passage through which combustion gas generated in the furnace flows; and a mantel provided on a top of the furnace and the combustion gas path, the reheater including a primary reheater and a secondary reheater, and upper portions of heat transfer tube groups constituting the primary reheater and the secondary reheater penetrating the mantel and being connected to a header pipe and a manifold pipe disposed in the mantel,

the outlet manifold of the primary reheater being divided into a left outlet manifold extending from a central portion in a furnace width direction toward a left side wall side of the furnace and a right outlet manifold extending from the central portion in the furnace width direction toward a right side wall side of the furnace,

the left side outlet manifold is coupled to a first connecting pipe leading to a right side of an inlet manifold of the secondary reheater, and the right side outlet manifold is coupled to a second connecting pipe leading to a left side of the inlet manifold,

the left outlet manifold and the right outlet manifold are set to be substantially the same height so as to be staggered in the front-rear direction orthogonal to the furnace width direction.

2. The boiler arrangement according to claim 1,

the first linking pipe has a first straight portion extending in parallel along the right side outlet manifold, and the second linking pipe has a second straight portion extending in parallel along the left side outlet manifold,

the header combined with the left side outlet manifold protrudes toward the second straight portion, and the header combined with the right side outlet manifold protrudes toward the second straight portion.

3. The boiler arrangement according to claim 1 or 2,

the inlet manifolds are arranged on substantially the same plane so as to be shifted in a front-rear direction orthogonal to a furnace width direction with respect to the left outlet manifold and the right outlet manifold.

Technical Field

The present invention relates to a boiler apparatus in which a reheater or the like is disposed in a combustion gas passage, and more particularly to a manifold arrangement structure of a reheater including a primary reheater and a secondary reheater.

Background

In a boiler apparatus, a furnace for burning fuel is provided in a vertical direction, and a flue is connected to an upper portion of the furnace. The flue has a combustion gas passage inside, and a heat exchanger for generating steam is disposed in the combustion gas passage. Then, the combustion gas generated in the furnace flows through the combustion gas passage, thereby heating the boiler feed water flowing through the heat exchanger to generate steam.

The heat exchanger disposed in the combustion gas passage includes a superheater, a reheater, and an economizer. The boiler feed water supplied from the feed pump to the heat exchanger is preheated in the economizer, and then becomes saturated steam while being supplied to the water tubes of the furnace wall, and is heated by the combustion gas in the superheater. The superheated steam generated in the superheater is supplied to the high-pressure turbine for rotationally driving, and the rotationally driven steam is supplied to the reheater. Here, the reheater includes a primary reheater (low-temperature reheater) and a secondary reheater (high-temperature reheater), and the steam discharged from the high-pressure turbine is reheated in the primary reheater and the secondary reheater, and then supplied to the low-pressure turbine to rotationally drive the low-pressure turbine (see, for example, patent document 1).

In this type of boiler apparatus, a roof chamber called a mantle is provided on the top of the furnace and the combustion gas passage, and a plurality of headers connected to the upper portions of the heat transfer tube groups constituting the suspended heat exchanger and manifolds connected to the headers are arranged in the mantle. The manifold has an inlet manifold and an outlet manifold, and the reheater including the primary reheater and the secondary reheater is disposed in a state where the outlet manifold of the primary reheater and the inlet manifold of the secondary reheater are connected in the cabin.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-89909

Disclosure of Invention

Problems to be solved by the invention

The steam temperature in the manifold has a temperature difference in the width direction between the left and right sides, but if the left and right sides are switched between the outlet manifold of the primary reheater and the inlet manifold of the secondary reheater, the temperature difference between the left and right sides can be eliminated. Specifically, if the outlet manifold of the primary reheater is divided into two parts, i.e., left and right, in the furnace width direction, and the left outlet manifold of the primary reheater is connected to the right side of the inlet manifold of the secondary reheater, and the right outlet manifold of the primary reheater is connected to the left side of the inlet manifold of the secondary reheater, the difference in steam temperature between the left and right sides of the furnace width can be eliminated.

Here, if the left outlet manifold and the right outlet manifold divided into two parts are arranged at different heights by being shifted in the vertical direction, interference between the right outlet manifold and the connecting pipe connecting the left outlet manifold to the right side of the inlet manifold and interference between the left outlet manifold and the connecting pipe connecting the right outlet manifold to the left side of the inlet manifold can be avoided. However, in the case of such a configuration of the arrangement of the manifolds, there is a problem that the height of the cabin in which the manifolds are arranged needs to be increased, and the height of the building of the boiler device becomes high.

The present invention has been made in view of the above-described circumstances of the prior art, and an object thereof is to provide a boiler apparatus capable of suppressing a steam temperature difference in the width direction between the intermediate portions of the primary reheater and the secondary reheater, and reducing the height of the building.

Technical scheme

In order to achieve the above object, the present invention is a boiler device typically including: a furnace to burn fuel; a reheater disposed in a combustion gas passage through which combustion gas generated in the furnace flows; and a mantel provided on a ceiling portion of the furnace and the combustion gas passage, wherein the reheater includes a primary reheater and a secondary reheater, and an upper portion of a heat transfer tube group constituting the primary reheater and the secondary reheater penetrates the mantel portion and is connected to a header and a manifold disposed in the mantel portion, wherein an outlet manifold of the primary reheater is divided into a left outlet manifold extending from a central portion in a furnace width direction toward a left side wall of the furnace and a right outlet manifold extending from the central portion in the furnace width direction toward a right side wall of the furnace, the left outlet manifold is coupled to a first coupling pipe guiding a right side of an inlet manifold of the secondary reheater, the right outlet manifold is coupled to a second coupling pipe guiding the left side of the inlet manifold, and the left outlet manifold and the right outlet manifolds are set to be substantially identical in a front-rear direction offset from the furnace width direction A height.

Effects of the invention

According to the present invention, the building height of the boiler device can be reduced while suppressing the steam temperature difference in the furnace width direction between the primary reheater and the secondary reheater. The problems, configurations, and effects other than those described above will be apparent from the following description of the embodiments.

Drawings

Fig. 1 is an overall configuration diagram of a boiler device according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a configuration of a manifold arrangement of a primary reheater and a secondary reheater provided in the boiler device.

Fig. 3 is a plan view of the manifold arrangement.

Fig. 4 is a side view of the configuration of the manifold arrangement.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to fig. 1 to 4.

Fig. 1 is an overall configuration diagram of a boiler device according to an embodiment of the present invention. As shown in fig. 1, the boiler device 1 includes: a furnace 2 for burning fuel; a combustion gas passage 3 which is a flow path of combustion gas generated in the furnace 2; and a mantle 4 provided on the top of the burner 2 and the combustion gas passage 3. The furnace 2 and the combustion gas path are suspended from the beam portion 5a of the boiler reinforcing bars 5 by using not-shown suspension rods and suspension beams. The boiler building is constructed so as to cover the boiler reinforcing bars 5 (not shown). In the following description, the furnace 2 side of the boiler device 1 is referred to as the front side of the can, the outlet side of the combustion gas passage 3 is referred to as the back side of the can, the left side in the furnace width direction when viewed from the front side of the can is referred to as the left side of the can, and the right side is referred to as the right side of the can.

In the combustion gas passage 3 provided in connection with the upper portion of the furnace 2, a primary superheater 6, a secondary superheater 7, a tertiary superheater 8, a primary reheater 9, a secondary reheater 10, and an economizer (not shown) are provided as heat exchangers for recovering heat of the combustion gas, and heat is exchanged between the combustion gas generated in the furnace 2 and boiler feed water flowing through the heat exchangers. The boiler feed water supplied from the feed pump to the heat exchanger is preheated in the economizer and then heated to saturated steam while being supplied to the water tubes of the furnace wall.

The superheated steam heated in the furnace 2 is introduced to the inlet side of the primary superheater 6, is superheated to some extent in the primary superheater 6, and is introduced to the secondary superheater 7. The superheated steam introduced into the secondary superheater 7 is further superheated in the secondary superheater 7, introduced into the tertiary superheater 8, heated to a predetermined temperature in the tertiary superheater 8, and then discharged from the outlet side of the tertiary superheater 8 and supplied to a high-pressure turbine, not shown. Then, the high-pressure turbine is rotationally driven by the superheated steam leaving the tertiary superheater 8, and the steam that has operated in the high-pressure turbine is introduced into the inlet side of the primary reheater 9. The steam introduced from the high-pressure turbine into the primary reheater 9 is superheated in the primary reheater 9, introduced into the secondary reheater 10, heated to a predetermined temperature in the secondary reheater 10, and then discharged from the outlet side of the secondary reheater 10 and supplied to a low-pressure turbine, not shown. Fig. 1 is a structural diagram showing an example of the positional relationship between the superheater and the reheater, and does not faithfully show the arrangement of the heat transfer tubes, the headers, the manifolds, the walls of the boiler, the pipe structures, and the like.

In the boiler device 1 configured as described above, the furnace 2 and the ceiling 11 of the combustion gas passage 3 are formed by alternately connecting a plurality of heat transfer tubes to each other. In the mantle 4 provided above the roof 11, the upper parts of the heat transfer tube groups constituting the superheaters 6, 7, 8 or reheaters 9, 10 as suspended heat exchangers, and the headers and manifolds connected to the heat transfer tube groups are arranged. Here, in the boiler apparatus 1 of the present embodiment, a reheater including a primary reheater 9 on a low temperature side and a secondary reheater 10 on a high temperature side is used, and an outlet manifold of the primary reheater 9 and an inlet manifold of the secondary reheater 10 are connected in the mantle 4. The manifold arrangement of the primary reheater 9 and the secondary reheater 10 will be described in detail below with reference to fig. 2 to 4.

Fig. 2 is a perspective view showing a configuration of a manifold arrangement of the primary reheater and the secondary reheater, fig. 3 is a plan view of the configuration of the manifold arrangement, and fig. 4 is a side view of the configuration of the manifold arrangement.

As shown in fig. 2 to 4, the outlet manifold 12 of the primary reheater 9 is divided into left and right 2 portions in the furnace width direction, one of which is a left outlet manifold 13 extending from the center portion in the furnace width direction toward the left side wall, and the other of which is a right outlet manifold 14 extending from the center portion in the furnace width direction toward the right side wall. The left outlet manifold 13 and the right outlet manifold 14 are arranged to be shifted in the front-rear direction, and in the present embodiment, the right outlet manifold 14 is arranged to be shifted in the rear direction with respect to the left outlet manifold 13.

One end of a first connecting pipe 15 is connected to the right end of the left outlet manifold 13, and the other end of the first connecting pipe 15 is connected to the right end of an inlet manifold 16 of the secondary reheater 10 disposed in front of the outlet manifold 12. The first connecting pipe 15 has a first straight portion 15a arranged coaxially with the left outlet manifold 13 and a first turning portion 15b that changes the direction from the first straight portion 15a toward the front side of the tank and extends to the inlet manifold 16, and the first straight portion 15a faces the right outlet manifold 14 in parallel.

One end side of the second connecting pipe 17 is connected to the left end portion of the right outlet manifold 14, and the other end side of the second connecting pipe 17 is connected to the left end portion of the inlet manifold 16. The second connecting pipe 17 has a second linear portion 17a disposed coaxially with the right outlet manifold 14 and a second turning portion 17b that changes its direction from the second linear portion 17a toward the tank front side and extends to the inlet manifold 16, and the second linear portion 17a faces the left outlet manifold 13 in parallel. Therefore, the second turn 17b of the second connecting pipe 17 is set to be longer than the first turn 15b of the first connecting pipe 15 by a length corresponding to the distance separating the left outlet manifold 13 and the right outlet manifold 14 in the front-rear direction.

The plurality of headers 18 are welded to the tank rear side of the left outlet manifold 13 at regular intervals in the furnace width direction, and the plurality of headers 19 are welded to the tank front side of the right outlet manifold 14 at regular intervals in the furnace width direction. That is, the header pipe 18 connected to the left outlet manifold 13 projects rearward toward the second linear portion 17a disposed coaxially with the right outlet manifold 14, and the header pipe 19 connected to the right outlet manifold 14 projects forward toward the first linear portion 15a disposed coaxially with the left outlet manifold 13. The headers 18 and 19 are welded to the upper ends of the heat transfer tubes 20 corresponding to the primary reheaters 9, and the upper portions of the heat transfer tubes 20 penetrate the ceiling 11 and reach the inside of the mantle 4.

The arrows in fig. 2 indicate the flow of steam, and of the steam introduced from the inlet manifold of the primary reheater 9 to the outlet manifold 12, the steam introduced into the left outlet manifold 13 is supplied to the right end portion of the inlet manifold 16 of the secondary reheater 10 via the first connecting pipe 15, and the steam introduced into the right outlet manifold 14 is supplied to the left end portion of the inlet manifold 16 via the second connecting pipe 17. That is, although a temperature difference occurs between the steam temperature in the manifold in the width direction of the furnace, in the manifold arrangement structure of the present embodiment, the difference in steam temperature between the width direction of the furnace is eliminated by exchanging the steam temperature between the outlet manifold 12 of the primary reheater 9 and the inlet manifold 16 of the secondary reheater 10 in the right and left directions.

Here, as shown in fig. 4, the left outlet manifold 13 and the right outlet manifold 14, which are displaced in the front-rear direction, are arranged on substantially the same plane so as to have substantially the same height. The inlet manifold 16 of the secondary reheater 10 is also set to have substantially the same height as the left outlet manifold 13 and the right outlet manifold 14, and the left outlet manifold 13, the right outlet manifold 14, and the inlet manifold 16 are arranged on substantially the same plane. In this way, the manifold serving as the intermediate portion between the primary reheater 9 and the secondary reheater 10 can be arranged in a planar manner in the mantle 4, and therefore the height of the mantle 4 can be reduced.

The manifold arrangement structure described above is possible because the left outlet manifold 13 and the right outlet manifold 14, which are arranged so as to be shifted in the front-rear direction, are set to have substantially the same height, the left outlet manifold 13 is coupled to the right end of the inlet manifold 16 via the first connecting pipe 15, and the right outlet manifold 14 is coupled to the left end of the inlet manifold 16 via the second connecting pipe 17.

As described above, in the boiler device 1 of the present embodiment, the outlet manifold 12 of the primary reheater 9 is divided into the left outlet manifold 13 extending from the center portion in the furnace width direction toward the left sidewall and the right outlet manifold 14 extending from the center portion in the furnace width direction toward the right sidewall, the left outlet manifold 13 is coupled to the right end portion of the inlet manifold 16 via the first coupling pipe 15, the right outlet manifold 14 is coupled to the left end portion of the inlet manifold 16 via the second coupling pipe 17, and the left outlet manifold 13 and the right outlet manifold 14 are arranged to be offset in the front-rear direction at substantially the same height. Accordingly, the outlet manifold 12 of the primary reheater 9 and the inlet manifold 1 of the secondary reheater 10 are exchanged between each other in the left-right direction, so that the difference in steam temperature in the furnace width direction can be suppressed, the height of the mantel 4 can be reduced, and the building height of the boiler device 1 can be reduced.

Further, since the header 18 connected to the left outlet manifold 13 projects rearward toward the second straight line portion 17a arranged coaxially with the right outlet manifold 14 and the header 19 connected to the right outlet manifold 14 projects forward toward the first straight line portion 15a arranged coaxially with the left outlet manifold 13, the headers 18 and 19 connected to the left outlet manifold 13 and the right outlet manifold 14 can be arranged in a line at the same height, and the length of the heat transfer pipe 20 connected to the headers 18 and 19 in the shawl 4 can be made uniform.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention, and all technical matters included in the technical idea described in the claims are intended to be the objects of the present invention. While the preferred embodiments have been described, those skilled in the art will be able to realize various alternatives, modifications, variations, and improvements based on the disclosure of the present specification, and such alternatives, modifications, variations, and improvements are intended to be included within the scope of the invention as defined in the appended claims.

For example, in the above-described embodiment, the right outlet manifold 14 of the primary reheater 9 is arranged to be shifted rearward with respect to the left outlet manifold 13 of the primary reheater 9, but conversely, the right outlet manifold 14 may be arranged to be positioned forward and the left outlet manifold 13 may be shifted rearward.

In the above-described embodiment, the inlet manifold 16 of the secondary reheater 10 is disposed at a position slightly below the left outlet manifold 13 and the right outlet manifold 14 of the primary reheater 9 (see fig. 4), but the left outlet manifold 13, the right outlet manifold 14, and the inlet manifold 16 may be set to substantially the same height.

Description of the symbols

1 boiler device

2 furnace

3 passage of combustion gas

4 manta

5 boiler reinforcing steel bar

6 primary superheater

7 secondary superheater

8 tertiary superheater

9 Primary reheater

10 Secondary reheater

11 top of the container

12 primary reheater outlet manifold

13 primary reheater left side outlet manifold

14 right side outlet manifold of primary reheater

15 first connecting pipe

15a first linear part

15b first turning part

16 inlet manifold for secondary reheater

17 second connecting pipe

17a second straight line portion

17b second turning part

18. 19 collecting pipe

20 heat transfer tubes of a primary reheater.