JP2002267141A - Method and device for removing clinging matter from fluidized bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the quantity of waste generated and lessen the disposal cost of waste by the removal of clinging matter, and to dispense with the purchase cost of sand as blast material. SOLUTION: In a method of removing the clinging matter produced in a fluidized bed device 32 using a fluidized bed 34, the fluid matter used for the fluidized bed 34 is jetted out by air thereby being caused to collide against the produced clinging matter for removal, and the fluid matter after use is fluidized in the fluidized bed 34, and the fine powder including the clinging matter in the fluid matter is separated with being carried on fluidizing air, thus the fluid matter is extracted from the fluidized bed 34, and coarse grains including lump clinging matter in the fluid matter are separated and removed by a classifying means 46, and the fluid matter from which fine powder and coarse grains are removed is reused.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing deposits generated at various sites in an apparatus utilizing a fluidized bed.

[0002]

2. Description of the Related Art There are various apparatuses using a fluidized bed, such as a combustion apparatus, a reaction apparatus, and a heat recovery apparatus.
Depending on the processed material, deposits are generated and grown on the wall surface of the fluidized bed apparatus, the air nozzle or the heat transfer tube of the fluidized bed, or the cyclone, the rear heat transfer tube, the air preheater (GAH), and the like that are arranged subsequently. There are cases. The deposits are caused by substances contained in various fuels (RDF, oil coke, etc.) processed in the fluidized bed, industrial waste, municipal waste, sludge, sludge, and the like. In addition, Na,
Chlorides such as K, sulfates, etc., or Pb, Al, Z
Adhesion in a relatively low temperature range from several hundred degrees Celsius to about 800 ° C. using a low melting point metal compound such as n as a binder, and high temperature region adhesion in addition to minerals such as Ca, Si, Al, and Fe It has been known.

[0003] Once the adhesion occurs, the adhesion generally continues, and the adhesion increases (grows) at the site. For example, if deposits grow on an air nozzle, an air preheater, or the like of a fluidized bed, the flow of air (gas) deteriorates, and in the case of a heat recovery device, the deposits grow on heat transfer tubes, thereby reducing the amount of heat recovery. Become. Further, in the case of a cyclone, the performance of the fluidized bed apparatus and related equipment and the like are reduced by the adhesion, for example, the dust collection efficiency is deteriorated by the growth of the attached matter. Therefore, when the amount of deposits increases, it is necessary to finally stop the plant and perform an operation of removing the deposits. Various methods are known as a method of removing the deposits, but generally, water washing, pickling, hammering, shaving off, water blasting, sand blasting,
Methods such as shot blasting are employed.

For example, in Japanese Patent No. 3111190, in an air preheater provided with a steam soot blowing device, compressed air obtained by mixing a mixture of coal ash and sand into a heat transfer element of the air preheater is injected by a suit blower. Thus, a system for removing the adhered matter attached to the heat transfer element is disclosed. Also, JP-A-2000-111029 discloses that
In a suspended heat transfer tube placed at the top of a boiler furnace, etc., high-pressure water is injected from a positioned nozzle into the bend at the bottom of the heat transfer tube to remove clinker-like ash adhering to the bend of the heat transfer tube. A method and apparatus are disclosed.

[0005]

When a blast method is employed as a means for removing deposits, the particle size used for sandblasting or shot blasting is as follows:
A thickness of about 0.1 mm to 1 mm is generally used, and a blast material in an amount of 10 to 100 times the amount of attached matter is required. In the conventional blast method, since the removed deposits and the used blast material become waste, a large amount of waste is generated by the operation of removing the deposits. For this reason,
In addition to the cost of the blast material to be purchased, there will be a cost for the disposal of newly generated waste. In the method using water blasting or washing, the fire-resistant wall and the like of the fluidized-bed apparatus may be wet with water, and the moisture may evaporate during combustion or the like, so that the fire-resistant wall or the like may be cracked or damaged.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to remove a fluid substance used in a fluidized bed when removing deposits formed in a fluidized bed apparatus using a fluidized bed. By carrying out sand blasting as a blasting material, the cost of purchasing sand as a blasting material becomes unnecessary, and the amount of waste generated by removing adhering substances can be significantly reduced, and the workability is also excellent. It is an object of the present invention to provide a method and an apparatus for removing extraneous deposits.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for removing deposits on a fluidized bed, which is provided in or in a fluidized bed apparatus using a fluidized bed. In the method of removing the deposits generated in the apparatus, the fluid substance used for forming the fluidized bed is ejected by an air jet and collides with the deposits generated, so that the facilities attached to the fluidized bed apparatus or the fluidized bed apparatus It is configured to remove extraneous matter generated therein. In this case, as a site where the deposits are generated, for example, an air nozzle below the fluidized bed, a heat transfer tube (heat transfer surface) installed in the fluidized bed, a fire-resistant wall in the fluidized bed apparatus, and a wake of the fluidized bed apparatus Heat transfer tube (heat transfer surface), cyclone downstream of the fluidized bed device, heat transfer tube (heat transfer surface) of the air preheater (GAH) downstream of the fluidized bed device, etc. are used for forming a fluidized bed. The flowing material is ejected to these sites by an air jet.

Further, the method of the present invention is a method for removing deposits generated in a fluidized bed apparatus using a fluidized bed, wherein the fluidized material used for forming the fluidized bed is ejected by an air jet to produce the fluidized bed. Collision with the deposit to remove the deposit,
The fluidized material after use is fluidized in the existing fluidized bed, the fines containing the deposits in the fluidized material are separated by accompanying the fluidized air, and the fluidized material extracted from the fluidized bed is ejected again by the air jet. , To remove the deposits by colliding with the deposits generated,
It is characterized in that these steps are performed repeatedly (see FIGS. 2 and 3). In the method of the present invention described above, coarse particles including lumpy deposits in the fluid material extracted from the fluidized bed are separated and removed, and the fluid material from which fine powder and coarse particles have been removed is ejected again by an air jet to produce the fluid material. It is preferable to make it collide with the attached matter (see FIGS. 2 and 3).

[0009] In the method of the present invention, the site where the deposits are formed is an air nozzle below the fluidized bed,
Examples include a heat transfer tube (heat transfer surface) installed in the fluidized bed, a refractory wall in the fluidized bed apparatus, and the like, in which a fluid substance used for forming the fluidized bed is jetted to these portions by an air jet. Also,
In these methods of the present invention, as a fluidized bed apparatus,
A device that uses an internal circulating fluidized bed that is divided into a combustion chamber that supplies fuel and burns in the fluidized bed, and a heat collection chamber that installs a heat transfer tube (heat transfer surface) in the fluidized bed and recovers heat Can be used (see FIG. 3). In these methods of the present invention, the fuel supplied to the fluidized bed apparatus is RDF.
(Solid waste fuel), oil coke, industrial waste, municipal waste, sludge, sludge, etc. are used to remove deposits generated by substances contained in these fuels.

An apparatus for removing deposits on a fluidized bed according to the present invention is a fluidized bed apparatus provided with a fluidized material supply system for transporting and supplying a fluidized material from a fluidized material storage tank for storing the fluidized material to a fluidized bed. In the course of transporting the fluidized material from the fluidized material storage tank to the fluidized bed, the fluidized material supply system is branched, and a fluidized material supply system for blasting is provided to supply the fluidized material to the fluidized material storage tank for blasting. A switching means is provided in the vicinity of the branching point to the fluid material supply system for blasting, and the system is switched by the switching means so that the fluid material can be transported to the fluid material storage tank for blasting, and the piping for extracting the fluid material from the fluid material storage tank for blasting is blasted. Fluid from the fluid material storage tank for blasting together with pressurized air for blasting in the fluidized bed apparatus Is characterized in that as blown to deposit generated in features incidental to the apparatus (see FIGS. 2 and 3). In the above device of the present invention,
At least a part of the pipe for ejecting the fluid material together with the blast air is constituted by a flexible member, and a nozzle is provided at the tip of the pipe so that the nozzle can be moved to the vicinity of the portion where the deposit is generated. preferable.

The "fluid material" used in the fluidized bed varies depending on the combustion device, the reaction device, the heat recovery device and the like described above, but in general, particles having a particle diameter of about 0.1 mm to 1 mm are often used. I have. This particle size is substantially the same as the particle size of the blast material described above, and the use of the “fluid substance” used in the fluidized bed as the blast material eliminates the cost of purchasing the blast material. Furthermore, the fluidized material (BM) after use for blasting is fluidized in a fluidized bed and used as a fluidized medium, so that generation of waste can be eliminated. As described later, it has been confirmed that even when a fluid substance is used as a blast material, it can be used again as a fluid substance in a fluidized bed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments and can be implemented with appropriate modifications. FIG. 1 shows an example of the configuration of a fluidized-bed boiler to which the method and apparatus of the present invention are applied. Reference numeral 10 denotes a fluidized-bed boiler main body, in which a fluidized bed 12 is formed at a lower portion. In the fluidized bed 12, an in-bed heat transfer tube (in-bed transfer surface) 14 is arranged. The air for combustion and fluidization is introduced into a wind box 16 below the fluidized bed 12 and jetted out from an air nozzle 18 to fluidize a fluidized medium such as silica sand to form the fluidized bed 12 and to form a fluidized bed. The fuel supplied from the upper part is the fluidized bed 12
Burned within. As the fuel, for example, RDF, oil coke, or the like is used. In FIG. 1, air is supplied from an air distribution plate provided with air nozzles. However, air may be supplied from an air diffuser or the like. The combustion gas is discharged from the upper portion of the free tower (freeboard) 20 above the fluidized bed 12 and enters the cyclone 22 where most of the dust is removed. Further, the exhaust gas enters the rear heat transfer tube (rear transfer surface) 24 to recover heat,
Next, the heat enters the air preheater (GAH) 26 and is recovered. Although not shown, the exhaust gas is then removed by a bag filter or the like and exhausted from the chimney.

There are various types of fuels to be burned in the fluidized bed, and generally coal, heavy oil, etc. are used. However, depending on the type of fuel, deposits may be generated inside the fluidized bed or the like. is there. In a fluidized-bed boiler as shown in FIG. 1, for example, when oil coke fuel is burned, various parts such as an air nozzle at the lower part of the fluidized bed, a heat transfer tube (bed in the bed), a wall surface made of a refractory material, and a cyclone at the subsequent stage Deposits are formed on the surface. For example, when deposits are formed on the air nozzle, the flow resistance of the air increases, and when the deposits grow and the opening of the air nozzle is closed, it is necessary to stop the operation of the fluidized bed apparatus. As a method of stopping the fluidized bed apparatus and removing the deposits, as described above, there are sandblasting, shot blasting, water blasting, hammering, and the like.When the sandblasting method is performed, the sand used as the blasting material may be used. In general, silica sand is used, and those having a particle diameter of about 0.5 mm to 1 mm are often used. On the other hand, “fluid material” that forms a fluidized bed generally has a particle size of 0.5 mm to 1 mm.
Some silica sand is used, and it is considered possible to use this fluid as blasting particles.

Therefore, in a fluidized-bed boiler as shown in FIG. 1, an attempt was made to remove deposits on the air nozzle by using "fluidized material" forming a fluidized bed as particles for blasting. The following characteristics can be seen when the adhered substance is removed using this fluid material. (1) When ordinary silica sand is used as the blast particles, clogging of the silica sand is often observed in the piping for supplying the silica sand.
The use of flowable material eliminates this blockage. This is because the fluidized material has become substantially spherical particles due to fluidization. (2) Silica sand used as a blasting material is square and can efficiently remove extraneous matter. However, blasting often damages the air nozzle body. However, the use of a flowable material greatly reduces this flaw.

(3) Removal of deposits by the blasting method requires a blasting material in an amount of 10 to 100 times the amount of deposits. A large amount of blasting material will be generated as waste. However, when a fluid material is used, the fluid material after use can be fluidized and reused as a fluid material forming a fluidized bed, so that the amount of generated waste is greatly reduced. (4) When the particle size of the fluid material after using the fluid material as the blast material was measured, it was confirmed that the particle size was slightly reduced but hardly changed. on the other hand,
The silica sand used as the blast material is square, and the work of removing the deposits is slightly accelerated by the blast of the square silica sand. However, the corners disappear due to the blast, and a change in particle diameter is recognized. (5) In the flowing material after use for blasting, about 1
% To about 10% of adhering powder is mixed in, but by fluidizing the fluid substance after use with air, the adhering powder in the fluid substance is removed from the fluid substance by entrained air. It is clear that For this reason, the waste generated by removing the attached matter is removed by a cyclone in FIG. 1 along with air, and then by a dust collector (not shown) such as a bag filter. The amount is substantially the amount of the attached matter removed, and the amount of waste generated can be significantly reduced. As a result, the cost of treating waste is greatly reduced.

(6) Powder of the deposit is mixed into the fluid material once used for blasting. If the powder is mixed and reused as a blast material, the performance of removing adhering substances deteriorates. Therefore, when the powder is reused, it is preferable to separate and remove these powders. As a separation and removal method, the work of removing the deposit is temporarily suspended, air is supplied to the fluidized bed and fluidization is performed for several minutes, so that the generated powder is separated and removed from the fluidized material along with the air flow. be able to. In addition, if there is a lump in the removed deposits, it separates and deposits at the lower part of the fluidized bed due to fluidization.If it is separated and removed, the lump deposits do not enter the blasting device and blockage occurs. Efficient work is possible without the need. (7) In the above case, when a shot made of iron instead of silica sand is used, the shot cannot be fluidized by air from below because the specific gravity of the shot is large. For this reason, the powder of the generated deposits cannot be efficiently separated. In addition, when a shot is used, the air nozzle body may be scratched.

FIG. 2 shows a schematic configuration of an apparatus for performing a method for removing deposits on a fluidized bed according to a first embodiment of the present invention. As shown in FIG. 2, the fluid material is extracted from the lower part of the fluid material silo 28 for storing the fluid material as needed, and the fluid material is supplied to the fluidized bed 34 of the fluidized bed device 32 by the supply means 30. The blasting fluid is provided with a switching means 36 such as a switching valve in the course of transporting the fluidized substance by the supply means 30, and by switching the switching means 36, the blasting fluid is branched from the supply means 30 as necessary, and It is stored in a substance bottle (or hopper) 38. The operation of removing the deposits is performed by spraying the fluid substance from the blast fluid substance bin 38 together with the pressurized blast air onto the deposits generated in the fluidized bed apparatus 32. FIG. 2 shows removal of deposits on the furnace wall as an example. Although not shown, the pipe 40 for ejecting the fluid material together with the blast air is partially or entirely made of a flexible member such as a rubber hose, and an injection nozzle is provided at the tip of the rubber hose or the like. Have been. The operation of removing the adhering matter is performed manually by stopping the operation of the fluidized bed apparatus 32, but may be automatically performed using a machine.

The fluid substance used for removing the deposits by blasting enters the fluidized bed 34 and is fluidized by the air jetted from the air nozzles 42, and the powder of the deposits in the fluid substance is entrained by the air. Removed from flowing material. The fine powder containing the deposits is discharged from the upper portion of the free tower (free board) 44 together with the combustion gas, and although not shown, as an example, most of the fine powder (dust) is removed by a cyclone, and further, the rear heat transfer tube is further removed. The heat is recovered at the (rear transfer surface), then recovered by the air preheater (GAH), then dust-removed by a bag filter or the like, and exhausted from the chimney. afterwards,
The fluidized material is discharged from the lower part of the fluidized bed 34 to the outside of the system, and after separating coarse particles containing massive deposits by a classification means 46 such as a fluidized material sieve, the fluidized material is transported to the fluidized material silo 28 by a transporting device 48 and stored. Is done. The fluid material is supplied from the fluid material silo 28 to the fluidized bed 34 as needed, and the fluid material is stored in the fluid material bottle (or hopper) 38 for blasting by switching the switching means 36 as needed. The description of FIG. 1 can be applied to the detailed configuration and operation of the fluidized bed apparatus.

FIG. 3 shows a schematic configuration of an apparatus for carrying out a method for removing deposits on a fluidized bed according to a second embodiment of the present invention. FIG. 3 shows an example of an internal circulating fluidized bed for burning RDF fuel. In the fluidized bed apparatus 50 using the internal circulating fluidized bed shown in FIG.
2 for combustion. Combustion cell 52 and heat collection cell 54
Are divided by providing a partition wall 56, and a heat transfer tube (transfer surface) 58 is provided in the heat collection cell 54 so that heat generated by the combustion of the RDF fuel is recovered by the heat collection cell 54. .
Passages are formed on the upper and lower sides of the partition wall 56, and wind boxes 60 and 62 are provided below the combustion cell 52 and the heat collection cell 54, respectively, to which fluidized air whose flow rates are independently adjusted is supplied. Have been. In the internal circulating fluidized bed, the superficial velocity of the combustion cell 52 is set to be higher than the superficial velocity of the heat collection cell 54, and the fluid material moves from the combustion cell 52 to the heat collection cell 54 across the partition wall 56. Combustion cell 5 from the bottom of heat cell 54
It circulates to two.

When the RDF fuel is burned in the fluidized bed, deposits may be formed on the air nozzle 42, the heat transfer tube (transfer surface) 58, the wall surface of the empty tower 64, and the like. FIG. 3 illustrates a configuration for removing extraneous matter generated on the air nozzle 42 as an example. As shown in FIG. 3, the fluid material is extracted from the lower portion of the fluid material silo 28 as necessary, and the fluid material is supplied to the fluidized bed by the supply means 30. The blasting fluid is provided with a switching means 36 on the way of feeding the fluid by the supply means 30.
, The liquid is branched from the supply means 30 and stored in the blasting fluid substance bin (or hopper) 38 as necessary. The adhering matter removal operation is performed by spraying the flowing material from the blasting fluid material bin 38 together with the pressurized blasting air onto the adhering matter generated in the air nozzle 42 (in the case of FIG. 3).

The fluid material used for removing the deposits by blasting is fluidized by the air jetted from the air nozzle 42, and the powder of the deposits in the fluid material is removed from the fluid material by the air. You. The fluidized material is discharged from the lower part of the fluidized bed to the outside of the system, separated by a classification means 46 into coarse particles containing massive deposits, and then transported to a fluidized material silo 28 by a transporting means 48 for storage. Other configurations and operations are the same as those in the first embodiment. Further, in the present embodiment, as a fluidized bed apparatus using an internal circulating fluidized bed, a three-cell fluidized bed in which the fluidized bed is divided into three cells by a double partition structure of a first partition and a second partition, It is also possible to use a 5-cell fluidized bed in which the bed is divided into five cells by 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.

[0022]

As described above, the present invention has the following effects. (1) As a method for removing deposits generated in a fluidized bed plant, a blast material is obtained by performing the method of the present invention in which a fluid substance used in a fluidized bed is used as it is when sandblasting is performed. As a result, there is no need to purchase sand. (2) The amount of waste generated by the removal of deposits is approximately the amount of only the deposits removed since the fluid material after use can be reused and does not become waste. Sand (silica sand) was used in the conventional method. It is significantly reduced to about 1% to 10% of the time. For this reason, the cost of treating waste is greatly reduced. (3) Since the fluidized material becomes an almost spherical particle due to fluidization, the clogging of the blast line is small,
Good workability. In addition, there is little risk of scratching the device. (4) By fluidizing the fluid material after being used as a blast material, powder of the attached matter can be separated and removed, and the fluid material can be easily reused.

[Brief description of the drawings]

FIG. 1 is a schematic configuration explanatory view showing an example of a fluidized bed boiler to which a method and an apparatus of the present invention are applied.

FIG. 2 is a schematic configuration explanatory view showing an apparatus for implementing a method for removing deposits on a fluidized bed according to a first embodiment of the present invention.

FIG. 3 is a schematic configuration explanatory view showing an apparatus for performing a method for removing deposits on a fluidized bed according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fluid bed boiler main body 12, 34 Fluidized bed 14 In-layer heat transfer tube (in-layer transfer surface) 16, 60, 62 Air box 18, 42 Air nozzle 20, 44, 64 Empty tower (free board) 22 Cyclone 24 Rear transfer Heat pipe (rear transfer surface) 26 Air preheater (GAH) 28 Fluid material silo 30 Supply means 32, 50 Fluid bed device 36 Switching means 38 Fluid material bottle for blast (hopper) 40 Pipe 46 Classification means 48 Transport means 52 Combustion cell 54 Heat collecting cell 56 Partition wall 58 Heat transfer tube (transfer surface)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B24C 3/32 B24C 3/32 Z 9/00 9/00 E F23J 3/00 101 F23J 3/00 101Z 3 A / 72 3/02 A (72) Inventor Kyoji Yamamoto 1-3-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Kouya Takeda 1-1-1, Higashikawasakicho, Chuo-ku, Kobe-shi No. 3 Kawasaki Heavy Industries, Ltd.Kobe Head Office (72) Inventor Toshio Hasegawa 3-1-1 Higashi Kawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd.Kobe Plant (72) Inventor Nobuo Suemitsu Minamisuna, Koto-ku, Tokyo 2-11-1 Kawasaki Heavy Industries, Ltd. Tokyo Design Office (72) Inventor Masaki Uemon 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Akashi Factory (72) Inventor Chitoku Kumagai 1-1, Kawasaki-cho, Akashi-shi, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. F-term in the Akashi factory (reference) AB06 BA02 BB32 CA10 CB08 CB19 DA01

Claims (9)

[Claims] In a method for removing deposits generated in a fluidized bed apparatus using a fluidized bed or in equipment attached to the fluidized bed apparatus, a fluid substance used for forming a fluidized bed is ejected by an air jet. A method for removing deposits on a fluidized bed, wherein the deposits generated in a fluidized bed apparatus or a facility attached to the fluidized bed apparatus are removed by colliding the deposits generated by the fluidized bed apparatus. 2. The portion where the deposits are formed is an air nozzle below the fluidized bed, a heat transfer tube installed in the fluidized bed, a fire-resistant wall in the fluidized bed device, a rear heat transfer tube downstream of the fluidized bed device, and a fluidized bed. The fluidized bed according to claim 1, wherein the fluidized bed is at least one of a cyclone downstream of the apparatus and a heat transfer tube of an air preheater downstream of the fluidized bed apparatus, and a fluid substance used for forming a fluidized bed is jetted to the portion by an air jet. To remove extraneous matter. 3. A method for removing deposits generated in a fluidized bed apparatus using a fluidized bed, wherein a fluid substance used for forming a fluidized bed is ejected by an air jet to collide with the generated deposits. The adhered matter is removed, the fluidized material after use is fluidized in the existing fluidized bed, and the fine powder containing the adhered matter in the fluidized material is separated by accompanying the fluidized air, and the fluidized material extracted from the fluidized bed is re-used. A method for removing deposits on a fluidized bed, comprising: ejecting the deposits with an air jet to collide with generated deposits to remove the deposits; and repeating these steps. 4. A method for separating and removing coarse particles including massive deposits in a fluid substance extracted from a fluidized bed, and ejecting the fluid substance from which fine powder and coarse particles have been removed again by an air jet to deposits generated. 4. The method for removing deposits on a fluidized bed according to claim 3, which is caused to collide. 5. The site where the deposits are generated is at least one of an air nozzle below the fluidized bed, a heat transfer tube installed in the fluidized bed, and a refractory wall in the fluidized bed apparatus, and is used for forming the fluidized bed. The method for removing deposits on a fluidized bed according to claim 3 or 4, wherein the fluid material to be ejected is jetted to the site by an air jet. 6. An internal circulating fluidized bed divided into a combustion chamber for supplying fuel and burning in the fluidized bed and a heat collecting chamber for installing a heat transfer tube in the fluidized bed and recovering heat. The method for removing deposits on a fluidized bed according to any one of claims 1 to 5, wherein the deposits generated in the fluidized bed apparatus are removed by using an apparatus utilizing the above method. 7. RD as a fuel supplied to the fluidized bed apparatus
The deposits generated by substances contained in the fuel are removed by using at least one of F, oil coke, industrial waste, municipal waste, sludge, and sludge.
The method for removing deposits on a fluidized bed according to any one of the above. 8. A fluidized bed apparatus provided with a fluidized material supply system for transporting and supplying a fluidized material from a fluidized material storage tank for storing the fluidized material to a fluidized bed, wherein the fluidized material is transported from the fluidized material storage tank to the fluidized bed. In the middle of the process, the fluid material supply system is branched, a fluid material supply system for blast is provided to supply fluid material to the fluid material storage tank for blast, and the fluid material supply system is switched to the vicinity of the branch point from the fluid material supply system to the fluid material supply system for blast Means, the system is switched by the switching means so that the fluid material can be transported to the fluid material storage tank for blast, and a pipe for extracting the fluid material from the fluid substance storage tank for blast is connected to a pipe for jetting air for blast, and blasting is performed. Of fluidized material from the fluidized material storage tank together with pressurized air for blasting, and to the deposits generated in the fluidized bed device or in the equipment attached to the fluidized bed device An apparatus for removing deposits on a fluidized bed, which is sprayed. 9. At least a part of a pipe for ejecting a fluid substance together with air for blasting is formed of a flexible member, and a nozzle is provided at a leading end of the pipe. 9. The apparatus for removing deposits on a fluidized bed according to claim 8, which is movable.