JP6936207B2 - Boiler device - Google Patents

Description

The present invention relates to a boiler device in which a reheater or the like is arranged in a combustion gas passage, and more particularly to a manifold arrangement configuration of a reheater composed of a primary reheater and a secondary reheater.

In the boiler device, a furnace for burning fuel is installed in the vertical direction, and a flue is connected above the furnace. The flue has a combustion gas passage inside, and a heat exchanger for generating steam is arranged in this combustion gas passage. Then, the combustion gas generated in the furnace flows through the combustion gas passage to heat the boiler supply water flowing through the heat exchanger to generate steam.

The heat exchanger arranged in the combustion gas passage is composed of a superheater, a reheater, and an economizer. The boiler water supply supplied from the water supply pump to the heat exchanger becomes saturated steam while being supplied to the water pipe of the furnace wall after being preheated by the economizer, and is heated by the combustion gas in the superheater. The superheated steam generated by the superheater is supplied to the high-pressure turbine and used for rotational driving, and the steam after rotational driving is supplied to the reheater. Here, the reheater is composed of a primary reheater (low temperature reheater) and a secondary reheater (high temperature reheater), and the steam discharged from the high pressure turbine is the primary reheater. After being reheated by the secondary reheater, it is supplied to a low-pressure turbine and driven to rotate (see, for example, Patent Document 1).

In this type of boiler device, a ceiling chamber called a penthouse is provided in the ceiling of the furnace and the combustion gas passage, and the upper part of the heat transfer tube group constituting the suspended heat exchanger is connected to the ceiling chamber in the penthouse. A plurality of pipes and a manifold connecting these pipes are arranged. The manifold has an inlet manifold and an outlet manifold. In a reheater composed of a primary reheater and a secondary reheater, the outlet manifold and the secondary reheat of the primary reheater are housed in the penthouse. It is arranged in a state where it is connected to the inlet manifold of the vessel.

JP-A-2017-89909

There is a temperature difference between the left and right steam temperatures in the manifold in the furnace width direction, but if the left and right are swapped between the outlet manifold of the primary reheater and the inlet manifold of the secondary reheater, the left and right sides will be affected. It is possible to eliminate the temperature difference. Specifically, after dividing the outlet manifold of the primary reheater into two left and right in the furnace width direction, the left outlet manifold of the primary reheater is connected to the right side of the inlet manifold of the secondary reheater to reheat the primary reheater. If the right outlet manifold of the vessel 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 that are divided into two are arranged in a staggered manner by shifting them in the vertical direction, interference between the connecting pipe that connects the left outlet manifold to the right side of the inlet manifold and the right outlet manifold can be avoided. Interference between the connecting pipe that connects the right outlet manifold to the left side of the inlet manifold and the left outlet manifold can be avoided. However, in the case of such a manifold arrangement configuration, it is necessary to increase the height of the penthouse in which the manifold is arranged, which causes a problem that the building height of the boiler device becomes high.

The present invention has been made from the actual situation of such a prior art, and an object of the present invention is to suppress the difference in steam temperature in the furnace width direction between the primary reheater and the secondary reheater, and to increase the height of the building. The purpose is to provide a boiler device capable of reducing the temperature.

In order to achieve the above object, a typical present invention includes a furnace for burning fuel, a reheater arranged in a combustion gas passage through which combustion gas generated in the furnace flows, and the furnace and the combustion. It is equipped with a pent house provided on the ceiling of the gas passage, and the reheater is composed of a primary reheater and a secondary reheater, and also constitutes these primary reheater and secondary reheater. In the boiler device in which the upper part of the heat transfer tube group is connected to the manifold and the tube side arranged in the pent house through the ceiling portion, the outlet manifold of the primary reheater is centered in the furnace width direction. It is divided into a left outlet manifold extending from the portion to the left wall side of the furnace and a right outlet manifold extending from the central portion in the furnace width direction to the right wall side of the furnace, and the left outlet manifold is the secondary reheat. The right outlet manifold is coupled to the second connecting pipe leading to the left side of the inlet manifold, and the left outlet manifold and the right side are coupled to the first connecting pipe leading to the right side of the inlet manifold of the vessel. The outlet manifold is characterized in that it is set at substantially the same height by shifting its position in the front-rear direction orthogonal to the furnace width direction.

According to the present invention, it is possible to reduce the building height of the boiler device while suppressing the difference in steam temperature in the furnace width direction between the primary reheater and the secondary reheater. Issues, configurations and effects other than those described above will be clarified by the description of the embodiments described below.

It is an overall block diagram of the boiler apparatus which concerns on embodiment of this invention. It is a perspective view which shows the manifold arrangement structure of the primary reheater and the secondary reheater provided in the boiler device. It is a top view of the manifold arrangement structure. It is a side view of the manifold arrangement structure.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 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 for combustion gas generated in the furnace 2, and a ceiling portion of the furnace 2 and the combustion gas passage 3. It is equipped with a penthouse 4 provided in. The furnace 2 and the combustion gas passage are suspended from the beam portion 5a of the boiler steel frame 5 by using a suspension rod and a suspension beam (not shown). The boiler building is constructed so as to cover the boiler steel frame 5 (not shown). In the following description, the furnace 2 side of the boiler device 1 is referred to as the front of the can, the outlet side of the combustion gas passage 3 is referred to as the rear of the can, and the left side in the furnace width direction when viewed from the front side of the can is the left side of the can and the right side is the right side of the can. It's called can right.

In the combustion gas passage 3 connected to the upper part of the furnace 2, as heat exchangers for recovering the heat of the combustion gas, a primary heater 6, a secondary heater 7, a tertiary boiler 8, and a primary reheater are used. A vessel 9, a secondary reheater 10, and a coal saver (not shown) are provided, and heat exchange is performed between the combustion gas generated in the furnace 2 and the boiler water supply flowing through the heat exchanger. The boiler water supply supplied from the water supply pump to the heat exchanger is preheated by the economizer and then heated while being supplied to the water pipe of the furnace wall to become saturated steam.

The superheated steam heated in the furnace 2 is introduced into the inlet side of the primary superheater 6, then superheated to some extent by the primary superheater 6 and introduced into the secondary superheater 7. The superheated steam introduced into the secondary superheater 7 is further superheated by the secondary superheater 7, introduced into the tertiary superheater 8, heated to a predetermined temperature by the tertiary superheater 8, and then heated by the tertiary superheater 8 to a predetermined temperature. It is discharged from the outlet side and supplied to a high-pressure turbine (not shown). Then, the high-pressure turbine is rotationally driven by the superheated steam emitted from the tertiary superheater 8, and the steam working in the high-pressure turbine is introduced to the inlet side of the primary reheater 9. The steam introduced from the high-pressure turbine into the primary reheater 9 is superheated by the primary reheater 9, then introduced into the secondary reheater 10, and after being heated to a predetermined temperature by the secondary reheater 10. , It is discharged from the outlet side of the secondary reheater 10 and supplied to a low-pressure turbine (not shown). Note that FIG. 1 is a configuration diagram showing an example of the positional relationship between the superheater and the reheater, and does not faithfully show the routing of each heat transfer tube, the header, the walls of the manifolds and the boiler, the duct structure, and the like.

In the boiler device 1 configured as described above, the ceiling portion 11 of the furnace 2 and the combustion gas passage 3 is manufactured by alternately connecting a plurality of heat transfer tubes and heat transfer tubes to each other. Then, in the penthouse 4 provided in the upper part of the ceiling portion 11, the upper part of the heat transfer tube group constituting the superheaters 6, 7, 8 and the reheaters 9, 10 which are suspension type heat exchangers, and these. The pipes and manifolds connected to the heat transfer tube group are arranged. Here, in the boiler device 1 according to the present embodiment, a reheater composed of a primary reheater 9 on the low temperature side and a secondary reheater 10 on the high temperature side is used, and these primary reheaters are used. The outlet manifold of 9 and the inlet manifold of the secondary reheater 10 are connected in the penthouse 4. Hereinafter, the manifold arrangement configuration of the primary reheater 9 and the secondary reheater 10 will be described in detail with reference to FIGS. 2 to 4.

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

As shown in FIGS. 2 to 4, the outlet manifold 12 of the primary reheater 9 is divided into two left and right in the furnace width direction, and one is the left outlet manifold 13 extending from the central portion in the furnace width direction toward the left wall. The other is a right outlet manifold 14 extending from the central portion in the furnace width direction toward the right wall. The left outlet manifold 13 and the right outlet manifold 14 are arranged so as to be displaced in the front-rear direction. In the case of the present embodiment, the right outlet manifold 14 is arranged so as to be displaced rearward with respect to the left outlet manifold 13. Has been done.

One end side of the first connecting pipe 15 is connected to the right end portion of the left outlet manifold 13, and the other end side of the first connecting pipe 15 is the secondary reheater 10 arranged at the front position of the outlet manifold 12. It is connected to the right end of the inlet manifold 16. The first connecting pipe 15 includes a first straight line portion 15a arranged coaxially with the left exit manifold 13 and a first turn portion 15b extending from the first straight line portion 15a to the front side of the can to the inlet manifold 16. The first straight line portion 15a faces parallel to the right exit manifold 14.

One end side of the second connecting pipe 17 is connected to the left end portion of the right exit 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 includes a second straight line portion 17a arranged coaxially with the right exit manifold 14, and a second turn portion 17b extending from the second straight line portion 17a to the front side of the can to the inlet manifold 16. The second straight line portion 17a faces parallel to the left exit manifold 13. Therefore, the second turn portion 17b of the second connecting pipe 17 is larger than the first turn portion 15b of the first connecting pipe 15 by the length corresponding to the distance between the left outlet manifold 13 and the right outlet manifold 14 in the front-rear direction. It is set longer.

A plurality of pipes 18 are welded to the rear side of the can of the left outlet manifold 13 at regular intervals in the furnace width direction, and a plurality of pipes 19 are welded to the front side of the can of the right outlet manifold 14 with a furnace width. Welded at regular intervals in the direction. That is, the pipe side 18 connected to the left side outlet manifold 13 projects rearward toward the second straight line portion 17a coaxially arranged with the right side outlet manifold 14, and the pipe side 19 connected to the right side outlet manifold 14 is on the left side. It projects forward toward the first straight line portion 15a coaxially arranged with the outlet manifold 13. The upper ends of the corresponding heat transfer tubes 20 of the primary reheater 9 are welded to the tubes 18 and 19, respectively, and the upper portions of these heat transfer tubes 20 penetrate the ceiling portion 11 and reach the inside of the penthouse 4. ..

The arrow in FIG. 2 indicates the flow of steam, and among the steam introduced into the outlet manifold 12 from the inlet manifold of the primary reheater 9, the steam introduced into the left outlet manifold 13 passes through the first connecting pipe 15. The steam introduced into the right end manifold 16 of the secondary reheater 10 is supplied to the right end portion of the inlet manifold 16 via the second connecting pipe 17, and is supplied to the left end portion of the inlet manifold 16 via the second connecting pipe 17. That is, there is a temperature difference between the steam temperature in the manifold on the left and right in the furnace width direction, but in the manifold arrangement configuration according to the present embodiment, the outlet manifold 12 of the primary reheater 9 and the inlet manifold 16 of the secondary reheater 10 are generated. By exchanging the left and right sides with, the difference in steam temperature between the left and right sides of the furnace width is eliminated.

Here, as shown in FIG. 4, the left exit manifold 13 and the right exit manifold 14 displaced in the front-rear direction are set to substantially the same height and are arranged on substantially the same plane. Further, 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 three. Are arranged on substantially the same plane. Since the manifold, which is an intermediate portion between the primary reheater 9 and the secondary reheater 10, is arranged in a plane in the pent house 4, the height dimension of the pent house 4 can be reduced. ..

The manifold arrangement configuration as described above is made possible by setting the left outlet manifold 13 and the right outlet manifold 14 arranged so as to be displaced in the front-rear direction at substantially the same height, and then setting the left outlet manifold 13 at substantially the same height. Is connected to the right end of the inlet manifold 16 via the first connecting pipe 15, and the right outlet manifold 14 is connected to the left end of the inlet manifold 16 via the second connecting pipe 17.

As described above, in the boiler device 1 according to the present embodiment, the outlet manifold 12 of the primary reheater 9 is divided into the left outlet manifold 13 extending from the central portion in the furnace width direction toward the left wall and the left outlet manifold 13 in the furnace width direction. It is divided into a right exit manifold 14 extending from the center toward the right wall, the left exit manifold 13 is connected to the right end of the inlet manifold 16 via the first connecting pipe 15, and the right outlet manifold 14 is secondly connected. After being connected to the left end of the inlet manifold 16 via a pipe 17, the left outlet manifold 13 and the right outlet manifold 14 are arranged at substantially the same height and shifted in the front-rear direction. As a result, the left and right sides can be exchanged between the outlet manifold 12 of the primary reheater 9 and the inlet manifold 16 of the secondary reheater 10, and the steam temperature difference in the furnace width direction can be suppressed. The height dimension of the pent house 4 can be reduced to reduce the height of the boiler device 1.

Further, the pipe side 18 connected to the left side outlet manifold 13 protrudes rearward toward the second straight line portion 17a coaxially arranged with the right side outlet manifold 14, and the pipe side 19 connected to the right side outlet manifold 14 is the left side outlet manifold. Since it projects forward toward the first straight line portion 15a coaxially arranged with 13, the left outlet manifold 13 and the pipes 18 and 19 connected to the right outlet manifold 14 should be arranged in a row at the same height. The length of the heat transfer tube 20 connected to each of the tubes 18 and 19 in the penthouse 4 can be made uniform.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention, and all the technical matters included in the technical idea described in the claims are all. It is the subject of the present invention. Although the above-described embodiment shows a suitable example, those skilled in the art can realize various alternative examples, modified examples, modified examples, or improved examples from the contents disclosed in the present specification. These are included in the technical scope described in the appended claims.

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

Further, in the above embodiment, the inlet manifold 16 of the secondary reheater 10 is arranged slightly below the left outlet manifold 13 and the right outlet manifold 14 of the primary reheater 9 (FIG. 4). (See), the left outlet manifold 13, the right outlet manifold 14, and the inlet manifold 16 may be set to substantially the same height.

1 Boiler device 2 Fire furnace 3 Combustion gas passage 4 Penthouse 5 Boiler steel frame 6 Primary heater 7 Secondary heater 8 Secondary heater 9 Primary reheater 10 Secondary reheater 11 Ceiling 12 Primary reheater outlet manifold 13 Left outlet manifold of primary reheater 14 Right outlet manifold of primary reheater 15 1st connecting pipe 15a 1st straight part 15b 1st turn part 16 Inlet manifold of secondary reheater 17 2nd connecting pipe 17a 2nd straight Part 17b 2nd turn part 18, 19 Tube side 20 Heat transfer tube of primary reheater

Claims (3)

A furnace for burning fuel, a reheater arranged in a combustion gas passage through which combustion gas generated in the furnace flows, and a penthouse provided on the ceiling of the furnace and the combustion gas passage are provided. The reheater is composed of a primary reheater and a secondary reheater, and the upper part of the heat transfer tube group constituting the primary reheater and the secondary reheater penetrates the ceiling portion. In the boiler device connected to the pipe and the manifold arranged in the pent house,
The outlet manifold of the primary reheater includes a left outlet manifold extending from the central portion in the furnace width direction to the left side wall side of the furnace and a right outlet manifold extending from the central portion in the furnace width direction to the right side wall side of the furnace. It is divided and
The left outlet manifold is coupled to a first connecting pipe leading to the right side of the inlet manifold of the secondary reheater, and the right outlet manifold is coupled to a second connecting pipe leading to the left side of the inlet manifold. And
The boiler device is characterized in that the left side outlet manifold and the right side outlet manifold are set at substantially the same height by shifting their positions in the front-rear direction orthogonal to the furnace width direction. In the boiler device according to claim 1,
The first connecting pipe has a first straight portion extending parallel to the right exit manifold, and the second connecting pipe has a second straight portion extending parallel to the left exit manifold. And
The pipe side coupled to the left outlet manifold projects toward the second straight line portion, and the pipe side coupled to the right side outlet manifold projects toward the second straight line portion. Boiler device. In the boiler device according to claim 1 or 2.
A boiler device characterized in that the inlet manifold is arranged on substantially the same plane with respect to the left outlet manifold and the right outlet manifold with the positions shifted in the front-rear direction orthogonal to the furnace width direction.

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