JPH04214111A - How to stop waste combustion equipment - Google Patents

Abstract

PURPOSE:To prevent the bad effects to the parts and the pollution of the surroundings and work environment by bad odor due to high temperature in a waste supplying machine by filling the inside of the waste supplying machine with incombustible waste in order to stop the waste combustion device after the waste is burned by charging waste into the waste combustion device by a waste supply machine. CONSTITUTION:After waste 60 is charged into and burned in a waste combustion device 10 by a waste supplying machine, the inside of the waste supplying machine 30 is filled with incombustible waste 70 to stop the waste combustion device 10. Therefore, the cases in which the waste 60 left in the waste supplying machine 30 rots and corrodes the devices such as a waste supplying machine or the bad odor from the waste supplying machine 30 is generated and it pollutes the environment do not occur. And, the case in which the waste 60 is carbonated and adheres to the inside of the waste supplying machine 30 by the heat generated when the combustion device is stopped is prevented, and the restarting of the combustion device operation can be carried out smoothly. And, it is possible to prevent the case in which the exhaust gas or hot gas goes through the inside of the waste supplying machine and is discharged to outside or the waste supplying machine is heated and it suffers the bad effects of heat.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for shutting down waste combustion equipment such as a fluidized bed incinerator that burns waste such as beer grounds, coffee grounds, sludge, pulp sludge, and the like.

0002

[Prior Art] Conventionally, waste such as beer dregs has been continuously supplied to the high-temperature combustion section of a combustion device using a waste feeder such as a screw to be burned and incinerated. A method is adopted in which the waste feeder is stopped with the inside of the waste feeder being empty or with waste still being filled inside.

0003

[Problem to be Solved by the Invention] However, in the above method of stopping the waste feeder while it is empty, when the combustion equipment is stopped, the feeder is stopped and emptied earlier than the combustion equipment. Therefore, there is a problem that the hot gas from the combustion device, which has a positive pressure inside, flows back inside the feeder, and the inside is exposed to the hot gas and becomes high temperature, which adversely affects parts such as bearings. Moreover, such a problem also occurs during preheating of a combustion section such as a fluidized bed at the start of operation. If the waste is filled with waste inside the feeder and then the feeder is stopped, it may generate a bad odor, especially if the waste is sludge or human waste, which may worsen the surrounding environment or working environment. There is a problem in that organic matter rots inside and corrodes the main body of the device, thereby adversely affecting the device. In addition, when the combustion equipment is stopped, the inside of the equipment is exposed to considerably high temperatures, and the feeder that communicates with the inside of the equipment also becomes hot, so the waste filling the inside gets heated, carbonizes, and solidifies. There is also the problem that waste cannot be supplied when the next operation starts. An object of the present invention is to solve these various problems.

0004

[Means for Solving the Problems] The present invention provides a method for injecting waste into a combustion apparatus using a waste feeder and burning the waste in the combustion apparatus, and then filling the inside of the waste feeder with non-combustible materials. The main feature is that the waste combustion equipment is stopped. Furthermore, the present invention is characterized in that the non-combustible material is allowed to pass through the waste feeder in advance before the waste feeder is filled with the non-flammable material. Further, the waste combustion apparatus is a fluidized bed combustion apparatus, and the incombustible material is a fluidized medium of the fluidized bed combustion apparatus.

[0005]

[Operation] When the combustion device is stopped, the supply of waste to the waste feeder is first cut off. After this, or in parallel with this operation, non-combustible materials such as sand are fed to the waste feeder, and after the waste feeder is operated for a while, the waste remaining inside the feeder is removed from the feeder. At the same time, when this dispensing is completed, the inside of the feeder is filled with incombustible materials. The waste feeder is then stopped and the combustion device is stopped.

[0006]

Embodiments Next, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a schematic vertical sectional view showing one embodiment of a fluidized bed waste combustion furnace to which the method of the present invention is applied. In FIG. 1, 10 is a fluidized bed incinerator as a waste combustion device;
12 is a furnace body, 14 is an air distribution plate;
A fluidized combustion chamber 16 is formed on the upper side, and an air chamber 18 is formed on the lower side.
is provided. The air chamber 18 has a combustion air supply pipe 1
9 and an auxiliary combustion burner 20 are attached. 16a is an exhaust gas outlet, and 21 is a pipe for supplying fuel such as heavy oil to the auxiliary burner 20. Flow combustion chamber 16 above the air distribution plate 14
Inside, a suitable fluidized medium 70 such as sand having a particle size of approximately 0.5 to 1.0 mm is fluidized by combustion air ejected from the air distribution plate 14 to form a fluidized bed 23 .

[0007] A screw pump (screw feeder in this embodiment) 30 is provided on the side of the furnace body 12 at a position facing into the fluidized combustion chamber 16 for feeding beer grounds 60 as waste into the incinerator 10. There is. This screw feeder 30
is a twin screw type, and the screw casing 3
1 has two screws 32 installed inside it. A beer lees input hopper 33 is provided above the raw material supply port of the screw feeder 30. At the top of the hopper 33 is a waste hopper 5 that stores beer lees 60 as waste.
0 is installed, and a circle feeder type discharge machine 51 for cutting out waste 60 from the waste hopper 50 is installed between the lower discharge port and the upper part of the beer lees input hopper 33.
is installed. 52 connects the lower end to the beer lees input hopper 3
3. This is the discharge chute facing the opening. On the other hand, a sand hopper 40 is installed next to the waste hopper 50, and sand such as silica sand, which is a fluid medium as a non-combustible material, is stored inside. 41 is a discharge rotary feeder, and 42 is a supply chute whose lower end faces the opening of the beer dregs input hopper 33.

In such a configuration, beer lees 60 as waste are cut out from the waste hopper 50 by the discharger 51, fed into the input hopper 33 via the chute 52, and further supplied to the screw feeder 30. The beer grounds 60 are then transferred and put into the fluidized combustion chamber 16 of the fluidized bed incinerator 10, where they fall and are put into the fluidized bed 23. The fluidized bed 23 is maintained at a high temperature (for example, about 800 to 900° C.) by the operation of the auxiliary combustion burner 20, and the beer grounds 60 are efficiently combusted and incinerated in this fluidized bed 23. The combustion exhaust gas is discharged from the exhaust gas outlet 16a to the outside of the furnace, and is further sent to a heat recovery unit such as a waste heat boiler (not shown) or a dust collector, where heat recovery and dust recovery are performed. In addition, FIG. 1 shows the state in which the beer lees 60 is being burnt in this way.

[0009] When the combustion and incineration action of the beer dregs 60 is completed, the incinerator 10 is stopped.
Upon this stop, first, the operation of the discharger 51 at the lower part of the waste hopper 50 is stopped, and the supply of beer lees 60 to the screw feeder 30 is cut off. After that, or in parallel with this operation, the rotary feeder 41 at the bottom of the sand hopper 40 is driven to rotate, and the sand 70 in the sand hopper 40 is supplied into the beer dregs input hopper 33 via the chute 42, and further into the screw feeder 30. Supplied. Then, the screw feeder 30 is operated for a while to feed the beer lees 60 remaining inside the casing 31 together with the sand 70.
is completely discharged and burned and incinerated in a fluidized bed 23. In this state, the screw feeder 30 is rotated for a while to allow only the sand 70 to pass through the inside of the casing 31, and the sand 70 cleans the inner surface of the casing 31, the screw (vanes) 32, the screw shaft, etc., and removes any particles that may adhere or remain there. Brush off the beer dregs 60. In this case, the sand 70 which is the cleaning material can be used as is as a fluidizing medium in the incinerator 10, which is advantageous.

After that, when the operation of the screw feeder 30 is stopped and the rotation of the rotary feeder 41 is stopped at the same time or after that, the inside of the casing 31 of the screw feeder 30 and the upper surface of the inside of the hopper 33 are filled with sand 70. The situation is as follows. After that, the supply of combustion air to the incinerator 10 is stopped, the operation of the auxiliary combustion burner 20 is stopped, and the operation of the incinerator 10 is stopped. Before the incinerator 10 is stopped, high-temperature exhaust gas is flowing inside the incinerator 10, but since the screw feeder 30 is filled with sand 70, this high-temperature gas flows into the screw feeder 30. It will never fall within 30. Note that when the incinerator 10 is stopped, fluidization of the fluidized bed 23 is stopped and the height of the fluidized bed 23 is lowered, so that the sand 70, which is a fluidized medium, is placed still on the air distribution plate 14.

When restarting the operation of the incinerator 10, combustion air is sent from the air chamber 18 and the auxiliary combustion burner 20 is operated to fluidize the fluidized medium (sand 70) to form the fluidized bed 2.
3 is formed, the fluidized bed 23 is preheated. At the time of preheating, the sand 70 filled in the screw feeder 30 is left as it is, and hot gas passes through the inside of the casing 31 and escapes to the rear. This is to prevent the screw feeder 30 from being heated. Then, when the preheating of the fluidized bed 23 is completed and the temperature reaches an operable temperature, the screw feeder 30 is rotated, and almost at the same time, the discharger 51 under the waste hopper 50 is activated to transfer the beer dregs 60 to the incinerator. Start feeding to 10. Thereafter, fluidized combustion of the beer lees 60 is performed continuously.

[0012] In this example, beer lees 70
During the fluidized combustion operation, the rotary feeder 41 is operated periodically or irregularly to supply the sand 70 in the sand hopper 40 to the screw feeder 30, so that the sand 70 is used to feed the inner surface of the casing 31 and the screw (vanes). 32 can also be cleaned. In addition, the sand hopper 4 of this embodiment
The sand supply device consisting of the rotary feeder 41, the rotary feeder 41, and the supply chute 42 can also be used for replenishing the fluidized bed 23 with the fluidized medium (sand). In addition, sand 7 is used as a fluid medium.
When limestone is used instead of 0, it is possible to desulfurize or dechlorinate the exhaust gas at the same time as combustion in the fluidized bed 23, but in this case, wear and abrasion may occur due to the calcining reaction of limestone, etc. This is especially useful since supplies are always required. In addition to the sand and limestone particles described above, the noncombustible materials to be filled in the waste feeder 30 of the present invention include alumina particles, etc., but in short, any material that is noncombustible and effective for cleaning equipment may be used.

Further, in this embodiment, the case where the waste is beer dregs is shown, but in the present invention, other wastes such as sludge, pulp sludge, and human waste may also be used. Also,
This is particularly useful for waste that is sticky or that is carbonized by heating and adheres to or adheres to equipment. In addition, although the fluidized bed incinerator 10 is shown as a waste combustion device,
The combustion furnace is not limited to the fluidized bed type but may be of other types such as a stoker type combustion furnace. Furthermore, the sand supply device is not limited to the hopper 40 type of this embodiment; the sand is conveyed by pneumatic transport and classified by a cyclone separator to obtain sand suitable as a fluid medium of a predetermined particle size, and is supplied to the waste input hopper 33. It is also possible to use a device in which the sand is transported from another location using a transport device such as a screw conveyor and then put into the hopper 33. In the present invention, of course, sand may be supplied by a person directly from a sand bag into the hopper 33 when the combustion apparatus is stopped.

[0014] The waste feeder is not limited to a screw feeder, but also a mechanical feeder such as a snake pump, or a nozzle type that feeds waste to the incinerator using a dispersion nozzle using compressed air or steam. It may be a feeding machine. In this type of nozzle type supply, when the operation is stopped, a mixture of steam or compressed air and sand is passed through the nozzle to clean the waste remaining on the inner surface of the nozzle, and then the supply of steam or compressed air is stopped. Supply sand into the nozzle to fill it.

[0015]

[Effects of the Invention] As explained above, according to the present invention,
The waste remaining in the waste feeder does not rot and corrode devices such as the feeder, and the feeder does not generate bad odors and deteriorate the environment. Moreover, when the combustion apparatus is stopped, waste is prevented from carbonizing and sticking inside the feeder due to heat, and the operation of the apparatus can be resumed smoothly. In addition, when the combustion equipment stops or starts operating, exhaust gas or hot gas passes through the inside of the feeder and is discharged to the outside, and the feeder is thereby heated, thereby preventing any adverse effects. You can try to prevent it. In addition, if the nonflammable material is allowed to pass through the feeder before filling the feeder, the inside of the feeder can be cleaned with the nonflammable material, which gradually adheres to the feeder. It is possible to prevent the phenomenon of drying and accumulation, and the non-combustible material can also be used as a cleaning material.

Furthermore, when the waste combustion apparatus is a fluidized bed combustion apparatus and the noncombustible material is used as the fluidized medium of the fluidized bed of the fluidized bed combustion apparatus, the noncombustible material filled in the feeder is operated by the feeder. Since it can be discharged into the combustion equipment and used as a fluid medium, there is no need for complicated removal work of incombustibles.
In addition, there is no need to separately prepare a filling material, which is not complicated and economical.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing one embodiment of a fluidized bed waste combustion furnace to which the method of the present invention is applied.

[Explanation of symbols]

10 Fluidized bed incinerator 14 Air distribution plate 16 Fluidized combustion chamber 18 Air chamber 23 Fluidized bed 30 Screw feeder (waste feeder) 40
Sand hopper 50 Waste hopper 60 Beer lees (waste) 70 Sand (non-combustible material, fluid medium)

Claims (3)

[Claims] Claim 1: After inputting waste into the combustion apparatus by a waste feeder and burning it in the combustion apparatus, the inside of the waste feeder is filled with non-combustible materials and the waste combustion apparatus is stopped. A method for stopping a waste combustion device, characterized in that: 2. The method for stopping a waste combustion apparatus according to claim 1, characterized in that, before filling the waste supply machine with noncombustible substances, the noncombustible substances are allowed to pass through the waste supply machine in advance. . 3. The method for shutting down a waste combustion device according to claim 1 or 2, wherein the waste combustion device is a fluidized bed combustion device, and the incombustible material is a fluidized medium of the fluidized bed combustion device. .