JP2570709Y2 - Fluidized medium supply device for fluidized bed combustion device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized-bed combustion device such as a fluidized-bed incinerator and a fluidized-bed boiler. The present invention relates to a fluidized-medium supply device for a fluidized-bed combustion device capable of supplying a fluidized medium by moving a supply device to an arbitrary position of a combustion device.

[0002]

2. Description of the Related Art In a fluidized bed incinerator such as a fluidized bed incinerator or a fluidized bed boiler, a fluidized medium such as sand is fluidized by high-temperature air in a combustion chamber to form a high-temperature fluidized bed, in which waste and waste are formed. Combustible materials such as coal are burned. In such a fluidized bed combustion apparatus, the fluidized medium wears out and its amount decreases while the operation is continued, so it is necessary to replenish the fluidized medium during the operation. The supply is configured by connecting a supply chute to a combustion chamber via a rotary valve to a fluidized medium tank fixedly installed on the machine side of the fluidized bed combustion apparatus to form a fluidized medium supply device, and rotating the fluidized medium by rotating the rotary valve. It is performed by dropping naturally from a chute and supplying it to the combustion chamber. In another method, a screw feeder is attached to a lower portion of a fluidized medium tank fixedly installed on the machine side of the fluidized bed combustion device, and an outlet of the screw feeder is opened to a combustion chamber of the fluidized bed combustion device to supply a fluidized medium supply device. And driving the screw feeder to supply the fluid medium to the combustion chamber.

[0003]

However, such a fixed fluid medium supply device requires a large amount of fixed installation space due to its complicated structure, and is inconvenient especially in a place where space is small. Further, since the supply point of the fluidized medium to the fluidized bed combustion device is limited to, for example, one place, it is difficult to uniformly supply the fluidized medium to the entire surface of the air distribution plate forming the fluidized bed. It should be noted that even if the fluidized bed is in a fluidized state, it is difficult to supply a fluidized medium only to a certain portion of the bed and to spread the fluidized medium evenly over the entire surface of the air distribution plate. The more the tendency, the stronger the tendency. Furthermore, since the above-described apparatus is mechanical, if the combustion chamber is at a positive pressure during operation of a fluidized bed incinerator or the like, the combustion gas leaks to the upstream side of the supply device, and the fluid medium is smoothly supplied to the combustion chamber. Can not. Further, since the supply device is installed in the high-temperature portion, the machine is exposed to high-temperature gas, so that it is necessary to use a material having high heat resistance and corrosion resistance.

[0004] The present invention has been made in view of such problems, and does not require an installation space, so that even in a large-sized combustion apparatus, a fluid medium is supplied evenly over substantially the entire combustion chamber. It is an object of the present invention to obtain a fluidized medium supply device for a fluidized bed combustion device which can perform a fluidized medium reliably without causing a leakage of combustion gas even during operation of the combustion device.

[0005]

In order to achieve the above object, according to the present invention, a fluidized medium supply device of a fluidized bed combustion device is provided on a movable vehicle having a plurality of wheels on a bottom surface, and a fluidized medium storage tank. A fluid medium delivery pipe connected to the lower outlet of the fluid medium storage tank and having a fluid medium discharge port at one end; and near the location where the fluid medium falls from the fluid medium storage tank inside the fluid medium delivery pipe. A transport air supply pipe having an air ejection section for supplying transport air toward the fluid medium discharge port and a transport air supply port communicating with the air ejection section. , The fluidized medium supply device is provided movably with respect to the fluidized bed combustion device, and the fluidized medium supply device is provided.
Between the fluidized medium outlet of the feeder and the combustion chamber of the fluidized bed combustor.
The fluid medium supply ports installed at intervals around the furnace wall
Removably connect with each other with fluid medium supply hose
Subsequently, the configuration is such that the fluid medium can be supplied to the combustion chamber .

[0006]

The fluid medium that has fallen from the fluid medium storage tank of the fluid medium supply device to the fluid medium delivery pipe is discharged from the air ejection portion of the transport air supply pipe that is opened in the fluid medium delivery pipe near the point where the fluid medium has dropped. The ejected transport air stream is sent to the fluid medium outlet at one end and discharged. And the
By connecting a discharge outlet of a fluid medium delivery pipe of the fluid medium supply device and a plurality of fluid medium supply ports attached around the combustion chamber on the fluidized bed combustion device side by a fluid medium transport hose, the combustion chamber
It can be supplied to the fluidized medium. The transportation air is supplied to the fluidized medium supply device by connecting the transportation air supply port of the transportation air supply pipe to an air supply source such as a factory with a hose.

However, since the transport device of the present invention can be moved by the cart provided with its wheels, it does not require an installation space unlike a conventional fixed supply device, and can be placed at an arbitrary location when not in use. When supplying the fluidized medium to the fluidized bed combustor while keeping it in storage, each position of the fluidized medium supply ports attached around the air distribution plate in the combustion chamber of the fluidized bed combustor the supply device is sequentially moved to, its a fluid medium outlet of the supply port and the supply device are connected by a hose can be supplied to the fluidized medium Runode, from the ambient air distribution plate of the fluidized bed combustion system The fluid medium can be supplied almost evenly over the entire surface.

Further, in the present invention, since the pneumatic transportation system is used, even when the combustion chamber of the fluidized bed combustion device is operated at a positive pressure, the combustion gas is prevented from leaking by transporting using the high pressure air. , it is possible to replenish reliably supplied flowing medium even during operation, the fluidized bed combustion system as described above is Ino yo be provided only nozzle as bed material supply port around the combustion chamber, Ya feeder The structure of the combustion device is simplified, and there is no problem in heat resistance and corrosion resistance due to the high-temperature combustion gas.

[0009]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. 1 and 2 show an embodiment of a fluidized medium supply device of a fluidized bed combustion device according to the present invention, FIG. 1 is a front view of a mobile sand supply device as a fluidized medium supply device, and FIG. 2 is a right side of FIG. FIG. 3 is an enlarged vertical cross-sectional view of the fluidized medium delivery section in FIG. 1, and FIG. 4 is a view showing a procedure when a movable sand supply device is connected to a fluidized bed combustion device to supply a fluidized medium. This embodiment shows a case where the fluidized medium is sand and the fluidized bed incinerator is a fluidized bed incinerator.

In the figure, a movable sand feeder 1 has a rectangular truck 2 on which casters 3 as wheels are attached to four corners of a bottom surface, and a push handle portion 4 extending substantially upward is attached to one end of an upper surface. And a sand supply tank 5 supported and fixed on the cart 2 from both sides thereof by brackets 5b.
The upper opening is connected to the lower discharge port 5a of the sand supply tank 5 by the flange 12, the lower part is branched to both sides in the horizontal direction, opened, placed on the upper surface of the truck 2, and the sand 27a is removed from the sand supply tank 5. A sand delivery pipe main body 7a to be fed out, a delivery nozzle 7c connected to a horizontal opening on one end side of the sand delivery pipe main body 7a through a joint 7b and having a sand discharge port 7d at the tip.
A sand delivery pipe 7 comprising: a sand delivery pipe 7; and a delivery nozzle 7c of the sand delivery pipe main body 7a, which is mounted on the carriage 2 at an end opposite to the attachment side, with its tip gradually facing the sand discharge port 7d. An ejector 13 comprising an air ejection nozzle 8a and a diffuser 18 as a transportation air ejection portion is formed at the tip and bent upward at the opposite side of the air ejection portion to supply transportation air to the end. And a transport air supply pipe 8 provided with a port 8b.

The transport air supply pipe 8 is fitted into a gland 9c fixed to the outer periphery of the large diameter portion of the sand delivery pipe body 7a at the end opposite to the delivery nozzle 7c via a gland packing. The long screw bolt 10 is inserted between the bolt hole of the metal fitting 9a fixed to 9c and the bolt hole of the metal fitting 9b fixed to the sand sending pipe main body 7a, and is tightened with nuts from both sides to form a connection with the sand sending pipe main body 7a. It is installed in a state where the space is air-sealed. These metal fittings 9a and metal fittings 9
b and the long screw bolt 10 are transport capacity adjusting portions 1 described later.
1. As shown in detail in FIG. 3, the air ejection nozzle at the tip of the transport air supply pipe 8 has the air ejection nozzle 8.
a tip opening is provided near the discharge port 5a at the lower part of the sand supply tank 5 inside the sand delivery pipe 7 and located on the side of the sand discharge port 7d downstream from the center of the discharge port 5a by a predetermined distance D. At the tip end of the air ejection nozzle 8a, an air ejection nozzle 8a
The upstream end is located slightly upstream (distance d) from the front end opening, and the inner diameter is made larger than the outer diameter of the air ejection nozzle 8a to form a sand inlet 18a around the nozzle. The diffuser 18 whose diameter is reduced toward the discharge port 7d is connected to the air ejection nozzle 8a by a connecting member 19 and provided.

The transport capacity of the sand 27a of the sand supply device 1 itself is changed by the distance D between the center of the discharge port 5a and the tip end opening of the air ejection nozzle 8a.
Is adjusted by the transport capacity adjusting unit 11 shown in FIG.
That is, by loosening or tightening the nut of the long screw bolt 10, the distance D can be adjusted by moving the transport air supply pipe 8 in and out of the sand delivery pipe main body 7a. By adjusting the distance D to an appropriate value, an appropriate transport capacity can be secured. Note that the distance D
The larger the is, the lower the transport capacity. Sand supply tank 5
Inside the flange 12 of the lower discharge port 5a, a damper 12a for closing the descending flow of sand and adjusting the amount of the descending flow is provided, and the damper 12a is operated to be externally operable. A letter-shaped handle 12b is attached. A lid 6 is attached to the upper opening of the sand replenishing tank 5 so as to be openable and closable. The sand replenishing tank 5 is sealed with a stopper (not shown) so that air does not leak due to the transport air pressure during operation. Is tightened.

On the other hand, as shown in FIG. 4, the fluidized-bed incinerator 20 has a high-temperature air chamber 21 at a lower part, a combustion chamber 22 formed at an upper part via a gas dispersion plate 32, and an upper part at an upper part. An exhaust gas treatment chamber 23 is formed via a gas dispersion plate. An exhaust gas outlet is formed above the exhaust gas processing chamber 23. A plurality of nozzles 25 are attached around the furnace wall of the combustion chamber 22 at intervals as sand supply ports, and a shutoff valve 26 is attached to each end of the nozzle 25. During operation of the fluidized bed incinerator 20, sand 27a as a fluidized medium is fluidized by high-temperature air on the gas dispersion plate 32 in the combustion chamber 22 to form a high-temperature fluidized bed 27, in which waste (not shown) is disposed. Waste such as beer lees, pulp sludge, and sludge are supplied from the product supply device and burned. The high-temperature combustion exhaust gas that has exited the exhaust gas outlet is sent downstream through an exhaust gas duct, and the exhaust heat is recovered by an exhaust heat boiler, an air preheater, or the like (not shown).

The mobile sand feeder 1 constructed as described above
When sand is supplied to the fluidized bed incinerator 20 using
As shown in the figure, a supply valve 28 is attached to the sand discharge port 7d of the sand delivery pipe 7 of the mobile sand supply device 1, and the supply valve 28 of the sand discharge port 7d and the combustion chamber 22 of the fluidized bed incinerator 20 are provided. And a shutoff valve 26 of a nozzle 25 serving as a sand supply port around the furnace wall. In addition, the shutoff valve 26 of the nozzle 25 to which the hose is not connected is closed. Then, an air hose 31 is connected to the air supply port 8b of the transporting air supply pipe 8 of the mobile sand supply device 1 between the transporting high pressure air source. The sand supply tank 5 stores sand 27a as a fluid medium in advance. As the sand 27a, for example, silica sand having a particle size of 0.6 to 1.0 mm is used.

Then, after the supply air valve 28 of the sand discharge port 7d of the mobile sand supply device 1 is opened to supply the transport air to the ejector 13 in the sand delivery pipe 7, the damper 12a is opened by the handle 12b. When the sand 27 a is supplied from the sand supply tank 5 to the sand delivery pipe 7 and reaches the ejector 13, the diffuser 18 passes through the air ejection nozzle 8 a of the ejector 13.
The negative pressure acts on the sand flow inlet 18a of the diffuser 18 due to the air flow blown into the sand flow inlet 18a, and the sand 27a
Is sucked from the sand inlet 18a of the diffuser 18 into the inside thereof, and is then fed forward and discharged from the sand outlet 7d at the tip of the delivery nozzle 7c. Then, the sand 27 a passes through the supply valve 28, flows in the sand supply hose 30, is supplied from the nozzle 25 into the combustion chamber 22 through the shut-off valve 26 on the combustion chamber 22 side of the fluidized bed incinerator 20, and is supplied with gas. It is supplied onto the dispersion plate 32.

When the supply of the sand 27a from one nozzle 25 is completed, the damper 12a is closed, and the supply source valve 28 is closed.
The shutoff valve 26 is closed to stop the supply of the sand 27a, and the connection of the sand supply hose 30 on the shutoff valve 26 side is disconnected. Then, the movable sand supply device 1 is moved to the next necessary position of the nozzle 25 by using the hand-pushed handle portion 4, and the nozzle 2
The sand supply hose 30 is connected to the shutoff valve 26 of No. 5, and the same operation is performed thereafter to supply the sand 27a through the plurality of nozzles 25, and the sand 27a is supplied to the gas distribution plate 32 on the combustion chamber 22 side.
So that a substantially uniform amount is supplied to the entire surface of the substrate.

Thus, the mobile sand feeder 1 of the present embodiment.
In this case, the fluidized bed incinerator 20 is in operation as described above, and the pressure in the combustion chamber 22 is positive (for example, plus 40).
Even when the pressure is 0 to 500 mmAq), the sand 27 a can be supplied with the transport air having a higher pressure than that, so that the combustion gas leaks from the combustion chamber 22 (leakage).
And sand 27a can be stably supplied to the combustion chamber 22 for replenishment. The sand 27a in the combustion chamber 22 wears out and becomes smaller when the operation is continued, so that stable fluidization cannot be performed and stable fluid combustion cannot be performed. Therefore, it is necessary to supply the sand 27a even during operation. . The sand 27a can be supplied even when the fluidized bed incinerator 20 is stopped.

When the mobile sand feeder 1 is not used, it is possible to move the mobile sand feeder 1 and store it in an appropriate place, and a space as the fluidized bed incinerator 20 is required. And not. The sand transport capacity of the mobile sand supply device 1 can be easily adjusted by adjusting the opening of the supply source valve 28 and changing the pressure of the transport air passing through the ejector 13. If the transport air pressure is increased, the transport capacity can be increased almost in proportion. Of course, the opening degree of the damper 12a can be adjusted.

In the above-described embodiment, the case where the transport air ejecting section is constituted as the ejector 13 including the air ejecting nozzle 8a and the diffuser 18 has been described. It can also be constituted only by. Although the case where the fluid medium is sand has been described, the present invention can be applied to other fluid media as well as the fluid medium. And, the case of the fluidized bed incinerator was shown as a fluidized bed incinerator, but the present invention is not limited to this, and other fluidized bed boilers such as a fluidized bed boiler in which coal is burned in a fluidized bed to recover steam. Of course, a fluidized bed combustion device may be used.

[0020]

As is apparent from the above description, according to the present invention, the fluidized medium supply device is connected to the combustion chamber of the fluidized bed combustion device.
Fluid medium supply ports provided at intervals on the peripheral wall of the furnace wall
Can be moved to an arbitrary position to supply the fluid medium, so that no installation space is required as a supply device, and the supply device is stored or stored in an appropriate place when not in use. The structure of the fluidized bed combustion apparatus can be simplified, and the fluidized medium can be distributed around the combustion chamber.
Through a plurality of supply ports provided at intervals on the wall, it can be evenly distributed over almost the entire combustion chamber of the fluidized bed combustion apparatus. In addition, since the fluidized medium is transported by pneumatic transport, it can be transported at a high pressure against the pressure of the combustion atmosphere even when the fluidized bed combustion device is operating, eliminating the leakage of the combustion gas and the fluidized medium. It can be reliably supplied and replenished. Therefore, even when the fluidized medium wears and becomes smaller during operation of the fluidized bed combustor, the combustion action can be continued while maintaining a stable fluidized state without stopping the fluidized bed combustor. Thus, the present invention is excellent
Has practical value.

[Brief description of the drawings]

FIG. 1 is a front view of a movable sand supply device showing an embodiment as a fluidized medium supply device of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is an enlarged vertical sectional view of a fluid medium delivery pipe section in FIG. 1;

FIG. 4 is a diagram showing a procedure for supplying a fluidized medium by connecting a movable sand supply device to a fluidized bed incinerator as a fluidized bed combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile sand supply apparatus 2 Dolly 3 Caster (wheel) 5 Sand supply tank 7 Sand delivery pipe 7d Sand discharge port 8 Transport air supply pipe 8a Air ejection nozzle 8b Transport air supply port 20 Fluidized bed incinerator 22 Combustion chamber 25 Sand supply port (fluidized bed incinerator side) 27 Fluidized bed 27a Sand (fluidized medium)

Claims (1)

(57) [Scope of request for utility model registration] A fluidized medium is supplied to a combustion chamber of a fluidized bed combustion apparatus.
A fluidized medium supply device of a fluidized bed combustion device for supplying , comprising: a fluidized medium storage device, a fluidized medium storage tank, and a fluidized medium storage device; A fluid medium delivery pipe connected to a lower outlet of the tank and having a fluid medium discharge port at one end; and the fluid medium positioned inside the fluid medium delivery pipe near where the fluid medium falls from the fluid medium storage tank. The fluid medium supply device is configured by attaching an air ejection section for supplying transportation air toward the discharge port and a transportation air supply pipe having a transportation air supply port communicating with the air ejection section. Is provided movably with respect to the fluidized bed combustion device, and the fluidized medium outlet of the fluidized medium supply device and the fluidized bed fuel
Multiple units were installed at intervals around the furnace wall of the combustion chamber of the baking unit
Use a fluid medium supply hose between each of the fluid medium supply ports.
Removably connectable to supply fluidized medium to the combustion chamber
A fluidized-medium supply device for a fluidized-bed combustion device having a configuration .