JP3445219B2 - Fluidized bed partitioning method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to combustible materials such as
Municipal waste, industrial waste or RDF (Refuse
The present invention relates to a fluidized bed for burning Derived Fuel) and the like in a fluidized bed and recovering the thermal energy thereof.

[0002]

2. Description of the Related Art A fluidized bed combustion method is known as a combustion method for combustible materials such as municipal solid waste, industrial waste, RDF, etc., and when the combustion temperature is high, in order to set the combustion temperature to an appropriate temperature, A heat transfer tube is installed in the fluidized bed to recover heat. It is known that HCl is generated from the Cl content contained in the combustible material by the combustion of these combustible materials, and it is known that the heat transfer tube is corroded due to the HCl. For this reason, in the fluidized bed, an internal circulation fluidized bed is adopted as a means for differentiating between a combustion section where corrosive gas is generated and a heat collection section provided with a heat transfer tube where corrosive gas is not generated. The internal circulating fluidized bed is divided into a fluidized bed in which a partition is provided in the fluidized bed to combust municipal waste, industrial waste, RDF, etc. and a fluidized bed to collect heat by providing a heat transfer tube in the bed. On the floor.

As described above, the fluidized bed (combustion cell) that performs combustion and the fluidized bed (heat collection cell) that recovers heat are divided by partitions. This partition is roughly divided into a refractory structure and a heat transfer tube structure, but a heat transfer tube structure is generally adopted in a boiler for recovering heat. As an internal circulating fluidized bed that divides the fluidized bed by the partition of the heat transfer tube structure,
In Japanese Patent No. 758, a partition for partitioning a fluidized bed into a combustion section and a heat recovery section is composed of a heat transfer tube group, and a tube group of a fluid medium passing portion above this partition is substantially vertical (vertical) or on the combustion section side. There is disclosed a configuration in which the protector is provided in the pipe group of the fluid medium passing portion by arranging the protector in a tilted manner.

A method and apparatus for dividing a fluidized bed into a plurality of cells using a double partition structure is disclosed in Japanese Patent No. 28.
91996. That is, in this publication, a chamber provided with a fluidized bed is divided into a combustion cell and a heat collection cell by a first partition so that the upper side and the lower side communicate with each other, and the combustion cell is close to the first partition and is burned in parallel. A second partition is provided on the cell side, and only the lower side of the second partition is communicated so that the lower end of the second partition is higher than the lower end of the first partition so that the fluidized medium flows from the lower part of the combustion cell. Disclosed is a configuration in which it passes between the first partition and the second partition, moves over the second partition to the heat collection cell, and circulates from the lower part of the heat collection cell to the combustion cell side. Focusing on the partition that divides the combustion cell and the heat collection cell provided with a heat transfer tube, the above-mentioned Japanese Patent Publication No. 5-87758.
In Japanese Patent Publication No. 2891996 and Japanese Patent Publication No. 2891996, it is shown that the partition is constituted by an evaporator pipe of natural circulation.

[0005]

In the internal circulating fluidized bed,
The fluidized medium moves from the upper opening of the partition to the heat collecting cell and circulates from the lower opening of the heat collecting cell to the combustion cell.
When the partition is constituted by the evaporator tubes of natural circulation, the fluidized medium moves from the gap between the evaporator tubes arranged substantially vertically in the upper opening and the lower opening. Figure 1
0 and FIG. 11 show an internal circulation fluidized bed in which the partition is constituted by a conventional natural circulation evaporator tube. In the fluidized bed 10, the partition 12 is composed of a natural circulation evaporator tube 14,
The partition 16 is made of steel, refractory, or the like in a plate shape so that gas does not move between the combustion cell 18 and the heat collection cell 20. The fuel is supplied to the combustion cell 18, and the fluidized medium moves from the opening 22 on the upper side of the partition section 16 to the heat collecting cell 20 provided with the heat transfer tube 24, and passes from the heat collecting cell 20 through the opening 26 on the lower side of the partition section 16. It is circulated to the combustion cell 18. As shown in the side view of FIG. 11, the evaporator tube 14 of natural circulation is arranged in a comb shape in the opening 22 on the upper side of the partition section 16 and the opening 26 on the lower side of the partition section 16 through which the fluidized medium circulates. 27 is a header.

Therefore, the circulation of the fluidized medium is considerably hindered by the evaporator pipe 14. If the circulation of the fluidized medium is disturbed, there are problems such as insufficient heat collection amount in the heat collection cell and fluctuation of the heat collection amount. Further, at this time, as described in Japanese Patent Publication No. 5-87758, a protector made of steel or a fireproof material is provided around the comb-shaped evaporator tube in the fluid medium passing portion for the purpose of suppressing wear of the evaporator tube. When the material is applied, the gap between the evaporator tubes becomes even narrower and the circulation of the flowing medium is further obstructed.

In the natural circulation evaporator tube, it is necessary to incline the evaporator tube from the horizontal generally at an angle of about 3 ° or more, and the evaporator tube is arranged in the fluid medium passage portion above and below the partition. Will be configured. It was clarified that the evaporator pipe in the place where the fluidized medium moved was an obstacle to circulation of the fluidized medium, and the movement of the fluidized medium was hindered by this evaporator pipe. Generally speaking, the above Japanese Patent Publication No. 5-877.
As disclosed in Japanese Patent No. 58 and Japanese Patent No. 2891996, natural circulation evaporator tubes are arranged vertically (vertically) or inclined. Therefore, there is a comb-shaped evaporator tube in the region where the fluidized medium circulates, which impedes the circulation.

The present invention has been made in view of the above points, and an object of the present invention is to provide a partition in an internal circulation fluidized bed in which a partition is provided in the fluidized bed. It is possible to adopt a configuration in which the evaporator pipe is not placed in the upper and / or lower part of the fluid medium passage, which enables stable circulation of the fluid medium, and there is no shortage or fluctuation of the heat collection amount and stable. It is intended to provide a method and a device for partitioning a fluidized bed capable of performing the above operation.

[0009]

In order to achieve the above object, a fluidized bed partitioning method according to the present invention partitions a chamber provided with a fluidized bed so that passages are formed in the upper side and the lower side, respectively. It is divided into a combustion cell and a heat collection cell with, and a wind box or diffuser pipe to which the fluidized gas whose flow rate is independently adjusted is supplied is provided below or below each cell, and the superficial velocity of the combustion cell is adjusted. In the fluidized bed in which the fluidized medium moves from the combustion cell over the partition to the heat collection cell and circulates from the lower part of the heat collection cell to the combustion cell so as to be higher than the superficial velocity of the heat collection cell. Is constituted by an evaporator tube of forced circulation (see FIGS. 1, 2 and 3). Further, the method of the present invention divides a chamber provided with a fluidized bed into a combustion cell and a heat collecting cell with a partition so that passages are formed on the upper side and the lower side respectively, and the lower side or the lower side of each cell is divided. An air box or diffuser tube to which the fluidized gas whose flow rate is independently adjusted is supplied, and the superficial velocity of the combustion cell is made higher than the superficial velocity of the heat collecting cell, so that the fluidizing medium flows from the combustion cell. In a fluidized bed that moves over the partition to the heat collecting cell and circulates from the lower part of the heat collecting cell to the combustion cell, the partition is composed of an evaporator tube, and the heat receiving fluid flowing through the evaporator tube is forced circulation , Or
Place the evaporator tube in a substantially horizontal position and
And / or no evaporator tube is placed in the lower fluid medium passage
It is characterized by being configured (see FIGS. 1, 2, and 3).

Further, in the method of the present invention, the fluidized bed is divided into three cells by the first partition and the second partition, and the fluidized gas whose flow rate is independently adjusted is provided below or below each cell. An air box or air diffuser to be supplied is provided, and the first cell, which is a combustion cell, and the second cell, which is a circulation cell, are divided by the first partition so that the lower side communicates with each other, and the second cell and the heat collecting cell. The third cell is divided by the second partition so that the upper side and the lower side are in communication with each other, and the fluidized medium moves from the lower part of the first cell to the third cell via the second cell and beyond the second partition. In a fluidized bed that is circulated from the lower part of the cell to the second cell, at least one of the first partition and the second partition is constituted by an evaporator tube, and the heat receiving fluid flowing through the evaporator tube is forcedly circulated and vaporized.
The generator tube is arranged in a substantially horizontal arrangement, and the upper side of the partition and / or
Is a structure in which the evaporator tube is not placed in the lower fluid medium passage part.
It is characterized in that (see FIG. 4).

Further, in the method of the present invention, the fluidized bed is provided with a partition forming the central first cell so that other cells having substantially the same structure are arranged on both sides of the first cell which is a combustion cell. One partition and a third partition, the second partition outside the first partition, the fourth partition is provided outside the third partition, the second cell and the fourth cell that is a circulation cell on both sides of the first cell, Further, the third cell is provided outside the second cell, and the fifth cell is provided outside the fourth cell, and the fluidized gas with independently adjusted flow rate is supplied to the lower side or the lower side of each cell. Provided with a wind box or air diffuser, the first cell and the second cell are divided by the first partition so that the lower side communicates, and the upper and lower sides of the second cell and the third cell which is a heat collecting cell. It is divided by the second partition so as to communicate, and the first cell and the fourth cell are divided by the third partition so that the lower side communicates, And a fifth cell a four cell and the heat absorption cell upper and lower are classified in the fourth partition so as to communicate,
The fluidized medium moves from the lower part of the first cell to the third cell through the second cell, across the second partition, and circulates from the lower part of the third cell to the second cell, while the fluidized medium flows from the lower part of the first cell. A method for partitioning a fluidized bed that moves to a fifth cell through a fourth cell over a fourth partition and circulates from the lower part of the fifth cell to the fourth cell, the first partition, the second partition, At least one of the third partition and the fourth partition is composed of an evaporator tube,
The heat receiving fluid flowing through the evaporator tube is forcedly circulated and the evaporator
Place the pipes in a substantially horizontal position and place them above and / or below the partition.
It is characterized in that the evaporator tube is not arranged in the fluid medium passage portion on the side (see FIG. 5).

[0012] The natural circulation evaporator pipe needs to be inclined from the horizontal by about 3 ° or more so that the can water flows from the lower part to the upper part, whereas the forced circulation evaporator pipe is
The evaporator tubes may be arranged horizontally or may be arranged downward from the top. Therefore, by configuring the partition with the evaporator tube of forced circulation, it is possible to adopt a structure in which the evaporator tube is not disposed in the fluid medium passage portion above and / or below the partition. In this case, since the movement of the fluidized medium is not hindered, the heat absorption amount is insufficient,
There is no fluctuation and stable operation can be achieved. However, in the forced circulation evaporator pipe, since the can water is forcibly circulated by the circulation pump, a circulation pump is required, which increases the manufacturing cost and the utility, but has the advantage that stable operation can be achieved. Is bigger.

In the fluidized bed partitioning device of the present invention, the chamber provided with the fluidized bed is divided into a combustion cell and a heat collecting cell by partitioning so that passages are formed on the upper side and the lower side, respectively. An air box or air diffuser equipped with independent fluidized gas supply amount adjusting means is provided on the lower side or the lower side so that the superficial velocity of the combustion cell is higher than the superficial velocity of the heat collecting cell, and the fluidized medium is burned. In a fluidized bed that moves from the cell to the heat collection cell over the partition and circulates from the lower part of the heat collection cell to the combustion cell, the partition is composed of an evaporator tube arranged in a substantially horizontal position for forced circulation . Passing through the upper and / or lower fluid medium
The part is formed only by the opening, and the evaporator tube is placed in this part.
It is characterized in that it is not installed (see FIGS. 1, 2 and 3).

In the apparatus of the present invention, the fluidized bed is divided into three cells by the first partition and the second partition, and independent fluidized gas supply amount adjusting means is provided below or below each cell. Provide a wind box or air diffuser, and divide the first cell, which is a combustion cell, and the second cell, which is a circulation cell, by the first partition so that the lower side is in communication, and the second cell and the third cell, which is a heat collecting cell. And are divided by the second partition so that the upper side and the lower side communicate with each other, and the fluidized medium moves from the lower part of the first cell to the third cell via the second cell and beyond the second partition to the lower part of the third cell. At least one of the first partition and the second partition in the fluidized bed that is circulated from the second cell to the second cell is substantially horizontal for forced circulation.
Composed of evaporator tubes arranged above the partition and / or
The lower fluid medium passage is formed only by the opening,
It is characterized in that the evaporator tube is not arranged in the portion (see FIG. 4).

Further, in the apparatus of the present invention, the fluidized bed has a partition forming the first cell in the center so that other cells having substantially the same structure are arranged on both sides of the first cell which is a combustion cell. One partition and a third partition, the second partition outside the first partition, the fourth partition is provided outside the third partition, the second cell and the fourth cell that is a circulation cell on both sides of the first cell, Furthermore, a third cell is provided outside the second cell, and a fifth cell is provided outside the fourth cell, and a wind is provided with an independent fluidizing gas supply amount adjusting means below or below each cell. Provide a box or air diffuser, divide the first cell and the second cell by the first partition so that the lower side communicates, and connect the second cell and the third cell, which is a heat collecting cell, between the upper side and the lower side. To the second partition, the first cell and the fourth cell are separated by the third partition so that the lower side communicates, And the fifth cell, which is a heat collecting cell, are divided by the fourth partition so that the upper side and the lower side communicate with each other, and the fluidized medium is passed from the lower part of the first cell through the second cell to the second partition to the third partition. While moving to the cell and circulating from the lower part of the third cell to the second cell, the fluidized medium moves from the lower part of the first cell to the fifth cell through the fourth cell to the fifth cell, and then to the fifth cell. A partitioning device for a fluidized bed adapted to circulate from a lower part to a fourth cell, wherein at least one of the first partition, the second partition, the third partition and the fourth partition is a forced water circulation system.
Consists of flat evaporator tubes, above the partition and / or
The lower part of the fluid medium passage is formed only by the opening.
It is characterized in that the evaporator tube is not arranged in the portion (see FIG. 5).

[0016] This in those of the device of the present invention, the partition each other is constituted by the evaporator tube forced circulation, or that was composed of the evaporator tube forced circulation partition and another partition for coupling the support member Is preferred (see FIG. 7). In this case, the partitions constituted by the forced circulation evaporator pipes can be connected to each other by using the forced circulation evaporator pipes as a support member. Further, in these devices of the present invention, at least one of the partition constituted by the forced circulation evaporator pipe and the partition coupled with the forced circulation evaporator pipe is supported by the support member in the wind box. It is preferably fixed to the upper gas dispersion plate or air diffuser (see FIG. 7).

Further, in these devices of the present invention, the partition constituted by the forced circulation evaporator pipe can be connected to the heat transfer pipe provided in the fluidized bed of the heat collecting cell by the supporting member (FIG. 5). reference). Further, in these devices of the present invention,
Either the forced circulation evaporator pipe group forming the partition is connected to the header (see FIGS. 2 and 3), or the forced circulation evaporator pipe forming the partition is connected to a dedicated communication pipe. It can be configured (see FIG. 6). Further, in these devices of the present invention, in a heat collection cell provided with a superheater tube,
At least the evaporator pipes necessary to reinforce the partition structure are arranged and fixed between the rows in which the superheater pipes are arranged, and the evaporator pipes and the forced circulation evaporator pipes forming the partition are connected. Thus, the partition constituted by the forced circulation evaporator tube can be reinforced (see FIG. 8). In addition, in these devices of the present invention, the partition can be configured by the forced circulation evaporator tube, as well as by the forced circulation superheater tube (see FIG. 9).

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be appropriately modified and implemented. 1 and 2 show a schematic configuration of an apparatus for carrying out a fluidized bed partitioning method according to a first embodiment of the present invention. 3 shows a plan view (a view from above) of the device shown in FIG. Partition 3 in fluidized bed 28
0 is composed of an evaporator tube 32 of forced circulation, and more specifically,
The evaporator tube 32, steel material, refractory material, and the like are formed in a plate shape so that gas does not move between the combustion cell 36 and the heat collection cell 38. Specifically, the evaporator tubes 32 of forced circulation are airtightly connected by fins (fins), and the refractory material layer 34 and the like are provided so as to cover these fins and the evaporator tubes. The partition 30 has a structure in which the upper side and the lower side of the partition are open, and divides the fluidized bed 28 into a combustion cell 36 and a heat collecting cell 38. Below the combustion cell 36 and the heat collecting cell 38, a separate wind box 4 is provided via a gas dispersion plate 40.
2 and 44 are provided, and the air boxes 42 and 44 are supplied with fluidizing gas (generally, air) whose flow rates are independently adjusted. The fluidizing gas may be supplied by an air diffuser.

Fuel, for example, municipal solid waste, industrial waste, RDF, etc., is supplied to the combustion cell 36, and the fuel is burned by the air supplied from the wind box 42, and a fluid medium such as sand is fluidized. A fluidized bed 46 is formed. The heated fluid medium moves from the opening 48 on the upper side of the partition 30 to the heat collecting cell 38, and from the heat collecting cell 38 to the opening 5 on the lower side of the partition 30.
It is circulated to the combustion cell 36 through 0. The heat collection cell 38 is provided with a heat transfer tube 52 such as a superheater tube and / or an evaporator tube, in which heat is recovered. In the heat collecting cell 38, the fluidized bed 54 is formed by the air supplied from the wind box 44. By making the superficial velocity of the combustion cell 36 faster than that of the heat collecting cell 38, the fluidized medium can be circulated.

Since the partition 30 is constituted by the forced circulation evaporator pipe 32, it is not necessary to arrange the evaporator pipes in a substantially vertical arrangement or incline so that the can water flows from the lower part to the upper part.
The openings 48 on the upper side of the partition 30 and the openings 50 on the lower side of the partition 30, which are passage portions for the fluidized medium, can have a structure in which an evaporator pipe for obstructing the circulation of the fluidized medium is not provided. Thereby, the excellent effect that the stable circulation of the fluidized medium can be achieved is obtained. For example, forced circulation evaporator tube 32
Can be arranged substantially horizontally. In this case, FIG. 2 and FIG.
, A plurality of evaporator tubes 3 arranged substantially horizontally
2 may penetrate the main body 56 and be connected to the headers 58 and 58a. Although illustration is omitted, in the evaporator pipe 32 of forced circulation, the can water from the drum of the boiler body is circulated via the header 58 by the circulation pump to the evaporator pipe 3
The steam generated in the substantially horizontal evaporator pipe 32 is forcedly circulated to the drum via the header 58a. Further, a part of the can water from the drum can be introduced into the heat transfer tube 52 (in this case, the evaporator tube) provided in the heat collecting cell 38. In some cases, a header is not provided and a dedicated communication pipe is used, which will be described later.

FIG. 4 shows a schematic structure of an apparatus for carrying out a fluidized bed partitioning method according to a second embodiment of the present invention. The present embodiment relates to a fluidized bed in which a fluidized bed is divided into three cells by a double partition structure of a first partition and a second partition (hereinafter, this is appropriately referred to as a 3-cell fluidized bed). At least one of the partition and the second partition is configured by a forced circulation evaporator tube. In the fluidized bed 60, the first partition 61 has a structure in which only the lower side of the partition is open, and the second partition 62 has a structure in which the upper side and the lower side of the partition are open. Usually, the lower opening is formed so that the lower end of the first partition 61 is higher than the lower end of the second partition 62. The first partition 61 divides the first cell 71, which is a combustion cell, and the second cell 72, which is a circulation cell, into the second partition 6
At 2, the second cell 72 and the third cell 73, which is a heat collecting cell, are divided. First cell 71, second cell 72, third cell 73
Air boxes 81, 82, 83 independent of each other are provided on the lower side of the air boxes 81, 82, 8 via a gas dispersion plate 66.
A fluidizing gas (generally, air) whose flow rate is independently adjusted is supplied to each of the three. The fluidizing gas may be supplied by an air diffuser.

The fuel supplied to the first cell 71 burns in the combustion cell. The heated fluidized medium moves from the opening 68 on the lower side of the first partition 61 to the second cell 72, moves from the second cell 72 to the third cell 73 through the opening 70 on the upper side of the second partition 62, and An opening 76 below the second partition 62 from the third cell 73
Through the second cell 72. The third cell 73, which is a heat collecting cell, is provided with a heat transfer tube 78 such as a superheater tube and / or an evaporator tube. By making the superficial velocity of the second cell 72 higher than that of the third cell 73, the fluidized medium can be circulated. It is considered that the fluid medium is diffusively mixed at the openings 76 and 68 between the third cell 73 and the first cell 71. It is necessary to configure at least one of the first partition 61 and the second partition 62 by an evaporator pipe of forced circulation so that the evaporator water is arranged substantially vertically or inclined so that the can water flows from the lower part to the upper part. And the openings 68 below the first partition 61 and / or the openings 70 and 76 above and below the second partition 62, which are passages for the fluidized medium, are not provided with evaporator pipes that hinder the circulation of the fluidized medium. It becomes possible to make a structure. This allows
The excellent effect that a stable circulation of the fluid medium can be achieved is obtained. For example, the forced circulation evaporator tubes may be arranged substantially horizontally, and in this case, a plurality of evaporator tubes arranged substantially horizontally may penetrate the main body and be connected to the header. . In some cases, a header is not provided and a dedicated communication pipe is used, which will be described later. Other configurations and operations are similar to those of the first embodiment.

FIG. 5 shows a schematic construction of an apparatus for carrying out a fluidized bed partitioning method according to a third embodiment of the present invention. In the present embodiment, the fluidized bed which divides the fluidized bed into five cells with a double partition structure of a first partition and a second partition and a double partition structure of a third partition and a fourth partition (hereinafter, 5 as appropriate
In a cell fluidized bed), at least one of the first partition, the second partition, the third partition and the fourth partition is constituted by an evaporator tube of forced circulation. In the fluidized bed 80, the first partition 61 and the third partition 63 have a structure in which only the lower side of the partition is open, and the second partition 62 and the fourth partition 6
4 is a structure in which the upper side and the lower side of the partition are open.
The first partition 61 separates the first cell 71, which is a combustion cell, and the second cell 72, which is a circulation cell, and the second partition 62 separates the second cell 72 and the third cell 73, which is a heat collection cell. It The third partition 63 separates the first cell 71 from the fourth cell 74, which is a circulation cell, and the fourth partition 64 separates the fourth cell 74 and the fifth cell 75, which is a heat collecting cell. First cell 71, second cell 72, third cell 73, fourth cell 7
4, below the fifth cell 75, through the gas dispersion plate 66, independent air boxes 81, 82, 83, 84, 85.
Is provided, and the wind boxes 81, 82, 83, 84, 85 are
A fluidizing gas (generally, air) whose flow rate is independently adjusted is supplied to each. The fluidizing gas may be supplied by an air diffuser.

The fuel supplied to the first cell 71 burns in the combustion cell. The heated fluidized medium moves from the opening 68 on the lower side of the first partition 61 to the second cell 72, moves from the second cell 72 to the third cell 73 through the opening 70 on the upper side of the second partition 62, and An opening 76 below the second partition 62 from the third cell 73
Through the second cell 72. Similarly, the heated fluidized medium of the first cell 71 moves from the opening 86 on the lower side of the third partition 63 to the fourth cell 74, and passes through the opening 88 on the upper side of the fourth partition 64 from the fourth cell 74 to the fourth cell 74. It moves to the fifth cell 75 and is circulated from the fifth cell 75 to the fourth cell 74 through the opening 90 below the fourth partition 64. As an example, the third cell 73, which is a heat collecting cell, is provided with a superheater tube 92, and the fifth cell 75, which is a heat collecting cell, is provided with an evaporator tube 94. The third cell 73 is not limited to the case where the superheater tube is provided, and may be an evaporator tube, or both the superheater tube and the evaporator tube may be arranged. Similarly, the fifth cell 75 is not limited to the case where the evaporator tube is provided, and may be a superheater tube, or both the evaporator tube and the superheater tube may be arranged. By making the superficial velocity of the second cell 72 faster than that of the third cell 73 and making the superficial velocity of the fourth cell 74 faster than that of the fifth cell 75, Can be circulated.

First partition 61, second partition 62, third partition 6
By configuring at least one of the third and fourth partitions 64 with an evaporator pipe of forced circulation, it is not necessary to arrange the evaporator pipes in a substantially vertical arrangement or incline so that the can water flows from the lower part to the upper part. The opening 68 below the first partition 61, which is the passage of the fluidized medium, the openings 70 and 76 above and below the second partition 62, the opening 86 below the third partition 63, and the fourth partition 6
(4) It is possible to provide a structure in which the upper and lower openings 88, 90 are not provided with evaporator pipes that hinder the circulation of the fluidized medium. Thereby, the excellent effect that the stable circulation of the fluidized medium can be achieved is obtained. For example, the forced circulation evaporator tubes may be arranged substantially horizontally, and in this case, a plurality of evaporator tubes arranged substantially horizontally may penetrate the main body and be connected to the header. . In some cases, a header is not provided and a dedicated communication pipe is used, which will be described later. Further, a heat transfer tube (FIG. 5) in which a partition constituted by a forced circulation evaporator tube (in FIG. 5, a third partition 63 and a fourth partition 64 as an example) is provided in the heat collecting cell.
Then, the partition structure can be reinforced by connecting the evaporator pipe 94 provided in the fifth cell 75) with a supporting member (for example, a supporting metal object) 96. Other configurations and operations are similar to those of the first and second embodiments. In the second and third embodiments described above, a 3-cell fluidized bed and a 5-cell fluidized bed are described, respectively.
Added other cells to the front, back, left and right of the cell 7
The partitioning method of the present invention can be applied to a fluidized bed of cells or more.

FIG. 6 shows the second and third embodiments (double partition structure) of the present invention, in which the evaporator tubes for forced circulation forming the partitions are connected using a dedicated connecting tube. There is. As shown in FIG. 6, the partitions 98, 1 having a double partition structure
00 is constituted by the forced circulation evaporator tube 102,
As an example, the evaporator tube 102 is arranged in a substantially horizontal direction in a serpentine shape. In the forced circulation evaporator pipe 102, can water from the drum of the boiler main body is flowed to the evaporator pipe 102 by the circulation pump 104 through the dedicated communication pipe 106, and is generated in the substantially horizontal serpentine evaporator pipe 102. The steam is forced to circulate through the dedicated connecting pipe 108 to the drum. Also,
A part of the can water from the drum can be introduced into a heat transfer tube (evaporator tube) provided in the fluidized bed of the heat collecting cell. In this way, it is possible to configure a dedicated connecting pipe without providing a header. It is of course possible to apply the configuration using the exclusive connecting pipe to the first embodiment.

FIG. 7 shows an example of a supporting structure and a connecting structure of a partition constituted by an evaporator pipe of forced circulation in the second and third embodiments (double partition structure) of the present invention.
As shown in FIG. 7, the partitions 110 and 112 having a double partition structure are provided.
Is composed of an evaporator tube 114 of forced circulation, and each partition 110, 112 is divided for each evaporator tube group by a connecting structure of the evaporator tube 114 (described later) (however, there is no gap). Has become. The evaporator tube 114 is
As an example, they are arranged in a substantially horizontal tubular shape, and FIG. 7 specifically illustrates one of the evaporator tube groups of the partition 112. Further, the division structure of the same partition is not limited to two, but may be three or more, and may not be a division structure. Explaining the connection structure of FIG. 7, the can water introduced from the communication pipe 116 into the evaporator pipe 114 of the partition 112a passes through the connection pipe (evaporator pipe of forced circulation) 118 which is also a support member to evaporate the partition 110a. Through the connecting pipe 118a, then through the evaporator pipe of the partition 112b, and then through the connecting pipe 118b to the partition 110b.
After flowing through the evaporator pipe of No. 1, the pipe is circulated from the connecting pipe 116a to a drum or the like. In this way, the partition structure can be reinforced by connecting the partition using the connecting pipe (the evaporator pipe of forced circulation) as the supporting member. Further, in order to reinforce the partition structure, as shown in FIG. 7, the partition 110 and the partition 112 can be connected by a supporting member 120 such as a supporting metal. If any of the partitions is not composed of the forced circulation evaporator tube, the partition structure can be reinforced by a supporting member such as a supporting metal. Further, at least one of the partition 110 and the partition 112 (in FIG. 7, as an example, the partition 112).
Can be connected and fixed to the gas dispersion plate 124 by a support member 122 such as a support metal. In addition, in the case of a diffuser tube type fluidized bed, it is possible to fix it to the diffuser tube.

FIG. 8 shows another example of the partition support structure constituted by the forced circulation evaporator pipe in the second and third embodiments (double partition structure) of the present invention. In FIG.
As an example, the first cell 126, which is a combustion cell, and the second cell 128, which is a circulation cell, are divided by the first partition 130, and the second cell 128 and the third cell 132, which is a heat collecting cell, are separated by the second partition 134. The figure (plan view) which looked at the 3 cell fluidized bed divided by above from the top is shown. A superheater tube 136 is provided in the third cell 132, which is a heat collecting cell, and the superheater tube 136 is provided.
Has a configuration in which a group of tubes such as a serpentine tube are arranged on a plane that is substantially vertical and substantially perpendicular to the partition, and a large number of the tubes are arranged in parallel in the third cell 132 and connected to a header or the like. . Between the tube groups of the superheater tubes 136, for example, about every ten tubes, at least evaporator tubes 138 (for example, tube groups such as a serpentine tube) necessary to reinforce the partition structure are arranged and fixed,
This evaporator pipe 138 can be connected to the evaporator pipe of the partition (the second partition 134 in FIG. 8 as an example) configured by the forced circulation evaporator pipe to reinforce the partition structure. 5
The same configuration can be applied to a cell fluidized bed. Further, it is also possible to apply the above reinforcing means to the first embodiment (single partition structure).

FIG. 9 shows a schematic construction of an apparatus for carrying out a fluidized bed partitioning method according to a fourth embodiment of the present invention. In this embodiment, the partition is composed of a forced circulation superheater tube. Partition 30a in fluidized bed 28a
Is composed of a forced circulation superheater pipe 140, and the superheater pipe 140 is, for example, arranged in a substantially horizontal direction in a serpentine shape. 34a is a refractory material layer. Openings 48a and 50a are formed on the upper side and the lower side of the partition 30a, and the fluidized bed 28a is divided into a combustion cell and a heat collection cell by the partition 30a. 40a is a gas dispersion plate.
It should be noted that the plurality of superheater tubes arranged substantially horizontally are provided in the main body 56.
It is also possible to have a configuration in which it is connected to the header by penetrating a. In this embodiment, since the partition 30a is configured by the superheater pipe 140 of forced circulation, it is not necessary to arrange the superheater pipes in a substantially vertical arrangement or incline so that steam flows from the lower portion to the upper portion, and the fluidized medium is not required. An opening 48a which is a passage portion of
It becomes possible to adopt a structure in which a superheater tube that obstructs the circulation of the fluidized medium is not provided in 50a. Thereby, the excellent effect that the stable circulation of the fluidized medium can be achieved is obtained. Other configurations and effects of the fluidized bed are described in the first embodiment.
It is similar to the case of the form. Further, also in the present embodiment, it is possible to adopt the configurations as in the second and third embodiments, and further adopt the support structure and the contact structure applied to the second and third embodiments. It is possible.

[0030]

Since the present invention is configured as described above, it has the following effects. (1) In an internal circulating fluidized bed in which a partition is provided in the fluidized bed, by configuring the partition with an evaporator tube for forced circulation,
It is possible to adopt a configuration in which the evaporator pipe is not arranged in the fluid medium passage portion above and / or below the partition, which enables stable circulation of the fluid medium and eliminates shortage and fluctuation of the heat collection amount. Stable operation can be performed. (2) Since stable circulation of the fluidized medium can be achieved, stable operation of the plant becomes possible and performance can be improved.

[Brief description of drawings]

FIG. 1 is a schematic front sectional front view showing an apparatus for carrying out a fluidized bed partitioning method according to a first embodiment of the present invention.

FIG. 2 is a schematic left-side sectional explanatory view of the device shown in FIG.

FIG. 3 is a schematic plan cross-sectional explanatory view of the apparatus shown in FIG.

FIG. 4 is a schematic front sectional front view showing an apparatus for carrying out a fluidized bed partitioning method according to a second embodiment of the present invention.

FIG. 5 is a schematic sectional front sectional view showing an apparatus for carrying out a fluidized bed partitioning method according to a third embodiment of the present invention.

FIG. 6 is a schematic perspective explanatory view showing a configuration in which the forced circulation evaporator pipes that configure the partition are connected using a dedicated connecting pipe in the second and third embodiments of the present invention.

FIG. 7 is a schematic explanatory view showing an example of a support structure and a connection structure of a partition configured by a forced circulation evaporator pipe in the second and third embodiments of the present invention.

FIG. 8 is a schematic plan cross-sectional explanatory view showing another example of the support structure of the partition configured by the forced circulation evaporator pipe in the second and third embodiments of the present invention.

FIG. 9 is a schematic side sectional explanatory view showing an apparatus for carrying out a fluidized bed partitioning method according to a fourth embodiment of the present invention.

FIG. 10 is a schematic sectional front sectional view showing a conventional internal circulating fluidized bed.

11 is a schematic left side cross-sectional explanatory view of the apparatus shown in FIG.

[Explanation of symbols]

10, 28, 28a, 60, 80 Fluidized bed 12, 30, 30a, 98, 100, 110, 110
a, 110b, 112, 112a, 112b Partition 14 Natural circulation evaporator pipe 16 Partition section 18, 36 Combustion cell 20, 38 Heat collection cell 22, 26, 48, 48a, 50, 50a, 68, 7
0, 76, 86, 88, 90 Opening 24, 52, 78 Heat transfer tube 27, 58, 58a Header 32, 102, 114 Forced circulation evaporator tube 34, 34a Refractory layer 40, 40a, 66, 124 Gas dispersion plate 42, 44, 81, 82, 83, 84, 85 Air box 46, 54 Fluidized bed 56, 56a Main body 61, 130 First partition 62, 134 Second partition 63 Third partition 64 Fourth partition 71, 126 First cell 72, 128 Second cell 73, 132 Third cell 74 Fourth cell 75 Fifth cell 92, 136 Superheater tube 94, 138 Evaporator tube 96, 120, 122 Support member 104 Circulation pump 106, 108 Exclusive communication tube 116, 116a Connection pipe 118, 118a, 118b Connection pipe 140 Superheater pipe of forced circulation

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Uozumi 1-3-1, Higashikawasaki-cho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Kenichi Ogiyama 1-1-1, Higashi-kawasaki-cho, Chuo-ku, Kobe No. 3 Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Nobuo Suemitsu 2-11-1, Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries Ltd. Tokyo Design Office (72) Inventor Kazuyuki Hirohara Minamisuna, 2-11, Koto-ku, Tokyo No. 1 Kawasaki Heavy Industries Ltd. Tokyo Design Office (72) Inventor Sadayuki Muto 2-11-1, Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries Ltd. Tokyo Design Office (56) Reference JP-A-54-9027 (JP , A) JP 53-31001 (JP, A) JP 57-122203 (JP, A) JP 64-19208 (JP, A) JP 9-196 313 (JP, A) JP 59-167609 (JP, A) JP 54-5101 (JP, A) Actual opening 57-100001 (JP, U) Actual opening 57-120801 (JP, U) Japanese Patent Publication 3-27806 (JP, B2) Japanese Patent Publication 3-44967 (JP, Y2) Patent 2891996 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) F23C 10/02 F23G 5/30 ZAB F22B 1/02

Claims (13)

(57) [Claims] 1. A chamber provided with a fluidized bed is divided into a combustion cell and a heat collecting cell by a partition so that passages are formed on the upper side and the lower side, respectively, and is independently provided on the lower side or the lower side of each cell. A wind box or diffuser pipe to which the fluidized gas whose flow rate is adjusted is supplied is installed so that the superficial velocity of the combustion cell is higher than the superficial velocity of the heat collecting cell so that the fluidized medium crosses the partition from the combustion cell. In the fluidized bed that moves to the heat collection cell and circulates from the lower part of the heat collection cell to the combustion cell, the partition is composed of an evaporator tube, and the heat receiving fluid flowing through the evaporator tube is forced circulation .
On top of the partition
Evaporator tubes are arranged on the side and / or the lower side where the fluid medium passes
A method for partitioning a fluidized bed, characterized in that it is not configured . 2. The air box in which the fluidized bed is divided into three cells by a first partition and a second partition, and a fluidized gas whose flow rate is independently adjusted is supplied to the lower side or the lower side of each cell. An air diffuser is provided, and the first cell, which is a combustion cell, and the second cell, which is a circulation cell, are divided by the first partition so that the lower side is in communication, and the second cell and the third cell, which is a heat collecting cell, are on the upper side. And a second partition so that the lower side communicates with each other, and the fluidized medium moves from the lower part of the first cell to the third cell via the second cell and across the second partition to the second part from the lower part of the third cell. In a fluidized bed adapted to circulate in the cell, at least one of the first partition and the second partition is constituted by an evaporator pipe , the heat receiving fluid flowing through the evaporator pipe is forcedly circulated , and the arrangement of the evaporator pipe is substantially In a horizontal arrangement, the fluid medium passage portion above and / or below the partition
A method for partitioning a fluidized bed, characterized in that an evaporator tube is not arranged in the interior. 3. The fluidized bed comprises a first partition and a third partition which form a central first cell so that other cells having substantially the same structure are arranged on both sides of the first cell which is a combustion cell. age,
A second partition is provided outside the first partition, a fourth partition is provided outside the third partition, and the second cell and the fourth cell, which are circulation cells on both sides of the first cell, and the second cell outside the second cell. Three cells are divided so that a fifth cell is provided outside the fourth cell, and a wind box or diffuser tube to which the fluidized gas whose flow rate is independently adjusted is supplied below or below each cell. Provided, the first cell and the second cell are divided by the first partition so that the lower side communicates, and the second cell and the third cell, which is a heat collecting cell, are separated by the second partition so that the upper side and the lower side communicate. The first cell and the fourth cell are divided by a third partition so that the lower side communicates with each other, and the fourth cell and the fifth cell, which is a heat collecting cell, are communicated by the fourth partition so that the upper side and the lower side communicate with each other. The fluidized medium moves from the lower part of the first cell to the third cell through the second cell, across the second partition, and into the third cell. So that the fluid medium moves from the lower part of the first cell through the fourth cell to the fifth cell across the fourth partition and circulates from the lower part of the fifth cell to the fourth cell. The partitioning method for a fluidized bed according to claim 1, wherein at least one of the first partition, the second partition, the third partition and the fourth partition is constituted by an evaporator pipe, and the heat receiving fluid flowing through the evaporator pipe is Passing the fluid medium above and / or below the partition with forced circulation and with the evaporator tube arranged substantially horizontally
A method for partitioning a fluidized bed, characterized in that an evaporator tube is not arranged in a part . 4. A chamber provided with a fluidized bed is divided into a combustion cell and a heat collecting cell by a partition so that passages are formed on the upper side and the lower side, respectively, and the cells are independent on the lower side or the lower side of each cell. An air box or air diffuser equipped with fluidized gas supply control means is provided so that the superficial velocity of the combustion cell is higher than the superficial velocity of the heat collecting cell so that the fluid medium collects heat from the combustion cell beyond the partition. In the fluidized bed that moves to the cell and circulates from the lower part of the heat collecting cell to the combustion cell, the partition is forced to circulate.
It consists of an evaporator tube arranged almost horizontally, and the upper side of the partition and
And / or the lower fluid medium passage is formed only by the openings.
The fluidized-bed partitioning device is characterized in that the evaporator pipe is not arranged in this portion . 5. A wind box or air diffuser having a fluidized bed divided into three cells by a first partition and a second partition and having independent fluidized gas supply amount adjusting means below or below each cell. Provided, the first cell that is a combustion cell and the second cell that is a circulation cell are divided by the first partition so that the lower side communicates, and the upper and lower sides of the second cell and the third cell that is a heat collecting cell. Divided by the second partition so as to communicate, the fluidized medium moves from the lower part of the first cell to the third cell via the second cell, over the second partition, and circulates from the lower part of the third cell to the second cell. In the fluidized bed configured as described above, at least one of the first partition and the second partition is constituted by an evaporator tube arranged substantially horizontally for forced circulation, and the fluid medium passage part above and / or below the partition.
A partitioning device for a fluidized bed, characterized in that a portion is formed only by an opening portion and an evaporator pipe is not arranged in this portion . 6. The fluidized bed has first and third partitions forming a central first cell so that other cells having substantially the same structure are arranged on both sides of the first cell which is a combustion cell. age,
A second partition is provided outside the first partition, a fourth partition is provided outside the third partition, and the second cell and the fourth cell, which are circulation cells on both sides of the first cell, and the second cell outside the second cell. The three cells are divided so that the fifth cell is provided outside the fourth cell, and a wind box or an air diffuser provided with independent fluidizing gas supply amount adjusting means is provided below or below each cell, Divide one cell and the second cell by the first partition so that the lower side communicates,
The second cell and the third cell, which is a heat collecting cell, are divided by the second partition so that the upper side and the lower side communicate, and the first cell and the fourth cell are divided by the third partition so that the lower side communicates. , The fourth cell and the fifth cell, which is a heat collecting cell, are divided by the fourth partition so that the upper side and the lower side communicate with each other, and the fluid medium crosses the second partition from the lower part of the first cell through the second cell. Move to the third cell, and circulate from the lower part of the third cell to the second cell,
A fluidized bed partitioning device in which the fluidized medium moves from the lower part of the first cell through the fourth cell to the fifth cell across the fourth partition and circulates from the lower part of the fifth cell to the fourth cell. , At least one of the first partition, the second partition, the third partition and the fourth partition is constituted by an evaporator tube arranged substantially horizontally for forced circulation, and the fluid medium above and / or below the partition is passed.
The part is formed only by the opening, and the evaporator tube is placed in this part.
Partition device of the fluidized bed, characterized in that where the structure is not location. 7. The fluidized bed according to claim 5 or 6, wherein the partitions constituted by forced circulation evaporator tubes are joined together, or the partition constituted by forced circulation evaporator tubes and another partition are connected by a supporting member. Partition device. 8. forced circulation partition each other, which is constituted by the evaporator tube, the partitioning device of the fluidized bed of the connecting claims 5 or 6, wherein the evaporator tube forced circulation as a support member. 9. A partition composed of a forced circulation evaporator tube,
Forced circulation and at least one partition that is connected to the configured partition the evaporator tube, as claimed in any of claims 5-8 fixed to the gas distribution plate or diffuser tube on windbox with the support member Fluid bed partition device. The 10. is constituted by the evaporator tube forced circulation partition, of the fluidized bed according to any one of claims 4-9 which is linked with the heat transfer tubes and the support member provided on the fluidized bed of the heat absorption cell Partition device. 11. The evaporator pipe group for forced circulation constituting the partition is connected to the header, or the evaporator pipe for forced circulation constituting the partition is connected to a dedicated connecting pipe. The partitioning device for the fluidized bed according to any one of claims 4 to 10 . 12. An evaporator tube necessary for reinforcing at least a partition structure is arranged and fixed in a heat collection cell provided with a superheater tube, between the rows in which the superheater tube group is arranged. By connecting the evaporator tube and the forced circulation evaporator tube that constitutes the partition,
The partition device for a fluidized bed according to any one of claims 4 to 12 , wherein the partition constituted by an evaporator tube of forced circulation is reinforced. Instead of constituting the partition in the evaporator tube 13. forced circulation, the partition device of the fluidized bed according to any one of claims 4 to 12 so as to constitute a partition in superheater tube forced circulation.