JPH08327016A - Disposing structure of cyclone, bed material storage vessel and ash cooler for hexagonal boiler - Google Patents

Abstract

PURPOSE: To assure sufficient maintenance space around units and devices capable of reducing the diameter of a pressure vessel to store a hexagonal boiler as much as possible and disposing the units and devices therein without increasing the height of the vessel. CONSTITUTION: The disposing structure of cyclone assemblies 12, bed material storage vessels and ash coolers for a hexagonal boiler 10 has a hexagonal post boiler body 11 and a pressure vessel 15. The six bed material storage vessels are disposed at the centers of the sizes of the hexagonal post above the boiler body, and the six ash coolers are disposed therebetween. Further, the six cyclone assemblies 12 are disposed at the vertex positions of the upper hexagonal post. The each assembly has a pair of primary cyclones 12a disposed at the outside and a pair of secondary cyclones 12b disposed at the inside, and the feet of the primary cyclones are disposed between the vessels and the coolers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized fluidized bed boiler, and more particularly to an arrangement structure of a cyclone, a bed material storage container and an ash cooler in a hexagonal pressurized fluidized bed boiler.

[0002]

2. Description of the Related Art A pressurized fluidized bed combuster for fluidized combustion of coal under pressure is
Combined cycle combined with gas turbine has thermal efficiency of 40% or more, high desulfurization rate in furnace, NO
Since it has features such as a small amount of x generation, it is currently being developed as a new type boiler that replaces the conventional fine powder boiler.

Such a pressurized fluidized bed boiler has, for example, as shown in FIG. 4, a boiler body 1, a cyclone 2, an ash cooler 3, a bed material storage container 4, etc., which are housed in a pressure container 5. Yes, the coal C supplied from the outside is burned in the boiler body 1, the exhaust gas is sent to the cyclone 2, the ash removed by the cyclone 2 is cooled by the ash cooler 3 and returns to the boiler body 1, and the ash is removed. The removed exhaust gas is supplied to an external gas turbine (not shown) to perform work (for example, driving a generator).

Further, a fluidized bed B in which bed material such as coal ash or sand is fluidized by air A supplied from below is formed in the boiler body 1, and in the fluidized bed B, steam is contained. The evaporator 6a for generating, the superheater 6b, and the reheater 6c are inserted. Due to the heat generated by the combustion of coal in the fluidized bed B, water is evaporated in the evaporator 6a to become steam, and the steam is further heated in the superheater 6b to become superheated steam, which is provided outside. The steam turbine (not shown) expands and does work. Further, the steam whose temperature has dropped in the steam turbine is reheated by the reheater 6c to become superheated steam, and the steam turbine outside works again.

Further, a hexagonal pressure fluidized bed boiler (hereinafter simply referred to as a hexagonal boiler), which is a pressurized fluidized bed boiler described above, in which the boiler main body is in the form of a hexagonal column, is currently being developed. This hexagonal boiler is a boiler main body 1 in FIG.
Since it is a hexagonal column, the space efficiency in the pressure vessel is high, and even a high-power boiler can be made relatively small.

[0006]

However, in the above hexagonal boiler, there is a problem that it is difficult to rationally arrange the cyclone, the bed material storage container, and the ash cooler. That is, it is desirable for the pressure vessel 5 to be as small as possible in diameter and short (low in height) as long as the hexagonal boiler 1 can be stored. However, the cyclone, the bed material storage vessel, and the ash cooler have almost the same height. If it is arranged vertically, the diameter of the pressure vessel 5 becomes larger than that necessary for storing the hexagonal boiler 1, and conversely, if the heights of the cyclone, the bed material storage vessel, and the ash cooler are changed and arranged vertically. However, there is a problem that the pressure vessel 5 becomes too high. Also,
The cyclone 2 is composed of a combination of a primary cyclone and a secondary cyclone. In the above-mentioned hexagonal boiler, it is necessary to arrange a large number of cyclones 2 above the pressure vessel 4,
For maintenance of the cyclone, it is necessary to incline the maintenance pipe that penetrates the pressure vessel at the lower end of the cyclone.If a long primary cyclone is placed near the center of the pressure vessel, the primary cyclone will be installed for the maintenance pipe. There is a problem that the height becomes higher and the pressure vessel 5 becomes higher. Furthermore, because of, the maintenance space around each device was small, making maintenance difficult.

The present invention was devised to solve the above-mentioned various problems. That is, the object of the present invention is to reduce the diameter of the pressure vessel as long as the hexagonal boiler can be stored, and to arrange the cyclone, the bed material storage vessel, and the ash cooler inside without increasing the height of the pressure vessel. The purpose of the present invention is to provide an arrangement structure of a cyclone, a bed material storage container, and an ash cooler that can secure a sufficient maintenance space around each device while maintaining high space efficiency.

[0008]

According to the present invention, there is provided an arrangement structure of a cyclone, a bed material storage container, and an ash cooler in a hexagonal boiler including a boiler main body having a hexagonal outer shape and a pressure vessel surrounding the boiler main body. And six bed material storage containers arranged in the center of each side of the hexagonal column above the boiler body,
6 bed ash coolers arranged between the bed material storage containers, and 6 cyclone assemblies arranged at each apex position of the hexagonal column above the bed material storage container,
Each cyclone assembly consists of a pair of primary cyclones arranged on the outside and a pair of secondary cyclones corresponding to the primary cyclones arranged on the inside, and the foot portion of the primary cyclone comprises a bed material storage container and an ash cooler. There is provided an arrangement structure of a cyclone, a bed material storage container, and an ash cooler in a hexagonal boiler, which is arranged so as to be located between.

According to a preferred embodiment of the present invention, each said pair of primary cyclones has an integrally formed common inlet duct. Further, it is preferable that the pressure vessel has a maintenance hole at a position corresponding to the ash cooler.

[0010]

According to the above-described structure of the present invention, the six bed material storage containers and the ash coolers are arranged above the main body of the boiler so as to correspond to the sides of the hexagonal column and the vertices between them. It is possible to arrange the bed material storage container and the ash cooler at substantially the same height and with a sufficient space in the circumferential direction while keeping the size of the hexagonal boiler. Further, since each of the six cyclone assemblies is arranged such that the foot portion of the primary cyclone is located between the bed material storage container and the ash cooler, a part of the long primary cyclone (foot portion) and the bed material are The storage container and the ash cooler can be arranged at intervals in the circumferential direction and partially overlapping in the height direction. Further, since each cyclone assembly is composed of a pair of primary cyclones arranged on the outside and a pair of secondary cyclones arranged on the inside and corresponding to each primary cyclone, maintenance is performed by penetrating the pressure vessel at the lower end of the cyclone. Even if the pipe is inclined, it is not necessary to increase the height of the pressure vessel. Therefore, the diameter of the pressure vessel can be made small as long as the hexagonal boiler can be stored, and the cyclone, the bed material storage vessel, and the ash cooler can be arranged inside without increasing the height of the pressure vessel, which results in high space efficiency. It is possible to secure a sufficient maintenance space around each device while maintaining the above.

If a common inlet duct integrally formed is provided for each pair of primary cyclones, each cyclone assembly can be handled integrally and the cyclone assembly can be made compact. Further, if a maintenance hole is provided at a position corresponding to the ash cooler of the pressure vessel, the maintenance hole can be easily accessed from the maintenance hole and the maintenance can be further facilitated. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In the drawings, common parts are designated by the same reference numerals and used. FIG. 1 is a side sectional view of a hexagonal pressurized fluidized bed boiler (hexagonal boiler) according to the arrangement structure of the present invention. In this figure, a hexagonal boiler 10 includes a boiler body 11 having a hexagonal outer shape and a pressure vessel 1 surrounding the boiler body 11.
5, the cyclone assembly 12, the bed material storage container 14, and the ash cooler 13 are housed in the pressure container 15.

A substantially cylindrical exhaust gas manifold 8 is arranged above the center of the hexagonal boiler 11, and a plurality of cyclone assemblies 12 are arranged around the exhaust gas manifold 8. The cyclone assembly 12 includes a primary cyclone 12a and a secondary cyclone 12b. The exhaust gas enters the inlet duct 16 of the primary cyclone 12a from the exhaust gas manifold 8, and the exhaust gas from which ash has been separated by the primary cyclone 12a further enters the secondary cyclone 12b. To remove finer ash, and then the exhaust gas is supplied to an external gas turbine (not shown) through the cyclone outlet duct 9. The ash collected by the cyclone enters the ash cooler 13, is cooled there, and is then returned to the boiler body 11.

FIG. 2 is a sectional view taken along the line AA of FIG. As shown in this figure, in the arrangement structure of the present invention, six bed material storage containers 14 are arranged at the center of each side 11a of the hexagonal column above the boiler body 11, and the six ash coolers 13 are arranged. Are arranged between the bed material storage containers 14. That is, as shown in the figure, the bed material storage container 14
Is an elongated box shape and is radially arranged in conformity with each vertex of the hexagonal prism. In addition, the primary cyclone 12a
The foot portion of is disposed so as to be located between the bed material storage container 14 and the ash cooler 13.

With the above-described structure, the bed material storage container 14 and the ash cooler 13 are circumferentially arranged at substantially the same height while keeping the diameter of the pressure container 15 at the minimum necessary size for housing the boiler body 11. They can be arranged with sufficient spacing. Further, since the foot portion of the primary cyclone 12a is arranged so as to be located between the bed material storage container 14 and the ash cooler 13, a part (foot portion) of the long primary cyclone, the bed material storage container and the ash cooler are provided. And can be arranged at intervals in the circumferential direction and partially overlapping in the height direction. The ash collected in the foot portion of the primary cyclone 12a is cooled by the ash cooler 13 as shown by the arrow in FIG.
To the boiler main body 11 as described above.

Further, as shown in FIG. 2, the pressure vessel 15 is provided with a maintenance hole 15a at a position corresponding to the ash cooler 13. This maintenance hole 15
In FIG. 2, only two a are provided on the opposite side surfaces of the pressure vessel 15, but only one or three or more may be provided. Through the maintenance hole 15a, it is possible to easily access the ash cooler 13, the foot portion of the primary cyclone 12a, and the like that require maintenance, and to further facilitate the maintenance.

FIG. 3 is a sectional view taken along the line BB of FIG. As shown in this figure, in the arrangement structure of the present invention, the six cyclone assemblies 12 are arranged in the bed material storage container 14
Is arranged at each apex position of the hexagonal column (boiler body 11) above. Each cyclone assembly 12 is composed of a pair of primary cyclones 12a arranged on the outer side and a pair of secondary cyclones 12b arranged on the inner side and corresponding to the respective primary cyclones 12a. Cyclone assembly 1
The cyclones 12a and 12b forming part 2 are formed opposite to each other.

Further, as shown in FIG. 3, a pair of primary cyclones 12a are integrally formed with a common inlet duct 16
, And the inside of the common inlet duct 16 is divided into two to form a flow path to each cyclone.

With the above-mentioned structure, the cyclone assembly 12 can be compactly integrated and can be handled as a unit. Therefore, by arranging six identical cyclone assemblies 12 at equal intervals in the circumferential direction, it is possible to secure a sufficient maintenance space around the cyclone while maintaining the high space efficiency of the hexagonal boiler.

Since each cyclone assembly 12 is composed of a pair of primary cyclones 12a arranged on the outside and a pair of secondary cyclones 12b arranged on the inside and corresponding to each primary cyclone, it is shown in FIG. As described above, even if the maintenance pipe 17 penetrating the pressure vessel 15 is provided at the lower end of the primary cyclone 12a in an inclined manner, it is not necessary to increase the height of the pressure vessel 15.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0022]

As described above, the arrangement structure of the cyclone, the bed material storage container, and the ash cooler in the hexagonal boiler according to the present invention can reduce the diameter of the pressure container as long as the hexagonal boiler can be stored, and the pressure container A cyclone, bed material storage container, and ash cooler can be placed inside without increasing the height, which makes it possible to secure sufficient maintenance space around each device while maintaining high space efficiency. Have the effect.

[Brief description of drawings]

FIG. 1 is a side sectional view of a hexagonal boiler according to an arrangement structure of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is an overall configuration diagram of a conventional pressurized fluidized bed boiler.

[Explanation of symbols]

 1 Boiler main body 2 Cyclone 3 Bed material storage container 4 Ash cooler 5 Pressure container 6a Evaporator 6b Heater 6c Reheater 8 Exhaust gas manifold 9 Cyclone outlet duct 10 Hexagonal pressurized fluidized bed boiler 11 Boiler body 12 Cyclone assembly 12a Primary cyclone 12b Secondary cyclone 13 Ash cooler 14 Bed material storage container 15 Pressure vessel 15a Maintenance hole 16 Inlet duct 17 Maintenance pipe

Claims (3)

[Claims] 1. A structure for arranging a cyclone, a bed material storage container, and an ash cooler in a hexagonal boiler having a hexagonal external shape and a pressure vessel surrounding the boiler main body, each of which is a hexagonal column above the boiler main body. Six bed material storage containers arranged in the central part of the side, six ash coolers arranged between the bed material storage containers, and each of the apex positions of the hexagonal columns above the bed material storage container. 6 cyclone assemblies, each cyclone assembly consisting of a pair of primary cyclones arranged on the outside and a pair of secondary cyclones corresponding to each primary cyclone arranged on the inside, the primary cyclone Of the hexagonal boiler is characterized in that the foot portion thereof is arranged so as to be located between the bed material storage container and the ash cooler. Arrangement of over La. 2. The cyclone, the bed material storage container, and the ash cooler of the hexagonal boiler according to claim 1, wherein each pair of primary cyclones has a common inlet duct integrally formed therewith. Arrangement structure. 3. The arrangement structure of a cyclone, a bed material storage container, and an ash cooler in a hexagonal boiler according to claim 1, wherein the pressure container has a maintenance hole at a position corresponding to the ash cooler.