JPS6234117Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to collect waste materials such as municipal waste and industrial waste (hereinafter referred to as
This invention relates to a device for discharging incombustibles in a fluidized bed furnace that incinerates or thermally decomposes waste (referred to as waste).

Conventionally, an air distribution plate is installed at the bottom of the furnace, a fluidized bed is formed above the air distribution plate using a fluidized medium such as silica sand, and the waste placed on the fluidized bed is mixed, stirred, and pulverized by the fluidized bed. A fluidized bed furnace is used in which the waste is brought into contact with combustion air, and the waste is heated in a heat-stored fluidized bed for incineration or thermal decomposition treatment. In this case, noncombustible materials such as metals, stones, and glass contained in the waste are extracted from the furnace together with a fluidized medium through a noncombustible material extraction pipe opened at the bottom of the furnace. The operation of the fluidized bed furnace is continued through a series of post-treatment steps in which the fluidized bed furnace is separated and the fluidized medium is returned to the furnace.

If the shape of the incombustible material is small and the amount is small, the diameter of the incombustible material extraction section at the bottom of the furnace can be made smaller, and high-pressure air is introduced into the extraction pipe to separate the noncombustible material from the fluid medium and cool it. However, if waste containing noncombustibles is fed into the furnace after simple crushing without separating the noncombustibles in the pretreatment process, the diameter of the extraction pipe will also be large, and the high pressure It becomes difficult to separate and cool the non-combustibles and the fluidized medium by introducing air, and the non-combustibles have to be extracted out of the furnace together with the high-temperature fluidized medium.

The present invention was developed in consideration of the above points, and is capable of effectively extracting incombustible materials and discharging the accompanying high-temperature fluid medium without causing duct scattering or high temperatures, while keeping the surrounding environment sanitary. It is an object of the present invention to provide a device for discharging incombustibles in a fluidized bed furnace, which allows cooling and smooth operation of the above-mentioned post-treatment process.

Hereinafter, the configuration of the present invention will be explained based on embodiments shown in the drawings. Reference numeral 1 denotes a furnace body of a fluidized bed furnace. At the bottom of the furnace body 1, an air distribution plate 3 having a large number of air ejection holes 2 is provided. On the upper side of this air distribution plate 3, there is a fluidized bed made of a fluidized medium such as sand. 4 is formed, and a combustion chamber, a so-called freeboard section, is formed above this fluidized bed 4. 5 is a wind box formed between the hearth bottom and the air distribution plate 3. The above is a fluidized bed furnace that incinerates waste containing noncombustible materials such as metals, stones, and glass.In this fluidized bed furnace, it is possible to seal the bottom of the furnace and the air distribution plate with a fluid medium such as sand. A length of noncombustible material extraction pipe 6 is connected, and the lower part of this noncombustible material extraction pipe 6 is connected to an opening 7 having the same diameter or approximately the same diameter as this noncombustible material extraction pipe 6.
It is connected to the mantle 8, which has a sealing function with the outside and a cooling function. Furthermore, it rotates while contacting the inner surface of the mantle 8, and has an opening 10 having the same diameter or approximately the same diameter as the incombustible material extraction pipe 6 at a position that matches the lower end of the incombustible material extraction pipe 6, and has a cooling function. A kiln 11 with variable rotation speed is provided. This kiln 11 has an outlet 12 on the other side,
The length (kiln diameter
1.5 times or more). 1
3 is a bearing, 14 is a packing, 15 is a cooler provided at the end of the kiln, 16 is a cooling water inlet, 1
7 is a cooling water outlet, 18 is a cooler provided in the center of the kiln, 20 is a cooling water inlet, 21 is a cooling water outlet, and 22 is an exhaust gas pipe for returning leaked gas to the flue.

In the apparatus configured as described above, the incombustible material and the fluid medium such as sand that have fallen into the kiln 11 reach the discharge port 12 at the other end of the kiln as the kiln rotates. During this time, the non-combustible material and the fluid medium are cooled by cooling water sprayed onto the outside of the kiln. The noncombustibles and the fluidized medium discharged from the discharge port 12 are sent to a post-processing device where they are separated into the noncombustibles and the fluidized medium, and the fluidized medium is returned to the furnace again.

The incombustible material discharging device of the present invention has a variable kiln rotation speed as described above, so the amount of removal from the bottom of the furnace can be easily adjusted, and the incombustible material and fluidized medium are kept inside the kiln. Since it is cooled from the time it falls until it is discharged, dust is prevented from scattering during discharge, the surrounding environment can be kept sanitary, and operations in the post-processing process can be performed smoothly. It has the following effects:

[Brief explanation of the drawing]

Fig. 1 is an explanatory sectional view showing one embodiment of the device of the present invention, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1 (however, only the main parts are shown), and Fig. 3 is the same as Fig. 2. It is a cross-sectional explanatory view showing a state where the kiln is further rotated from the state. DESCRIPTION OF SYMBOLS 1...Furnace body, 2...Air outlet, 3...Air distribution plate, 4...Fluidized bed, 5...Wind box, 6...Incombustible material extraction pipe, 7...Opening, 8...Mantle , 10...
...Opening, 11...Kiln, 12...Discharge port, 13
... bearing, 14 ... packing, 15 ... cooler, 16 ... cooling water inlet, 17 ... cooling water outlet,
18...Cooler, 20...Cooling water inlet, 21...
Cooling water outlet, 22...Exhaust gas pipe.

Claims (1)

[Scope of utility model registration request] In a fluidized bed furnace that incinerates waste containing noncombustible materials such as metals, stones, and glass, a noncombustible material extraction pipe of a length that allows material sealing with a fluidized medium such as sand is connected to the bottom of the fluidized bed furnace. The lower part of this incombustible material extraction pipe is connected to a mantle that has an opening with the same diameter or approximately the same diameter as this incombustible material extraction pipe and has a sealing function with the outside and a cooling function, and furthermore, It rotates while touching the inner surface, has an opening with the same diameter or almost the same diameter as the noncombustible material extraction pipe at a position that matches the lower end of the noncombustible material extraction pipe, has a cooling function, and has a variable rotation speed. A fluidized bed comprising a kiln, the kiln having a discharge port on the other side, and having a length such that the fluidized medium and the non-combustible material do not flow out from the other discharge port when the kiln is stationary. Non-combustible material discharge device in furnace.