JP2000088226A - Input chute of fluidized bed incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely incorporate a light weight refuse inside a fluidized bed and prevent secondary air from being blown inside an input chute. SOLUTION: In a fluidized bed incinerator, a beam material 23 is arranged on an upper end 22a of an outlet side opening part 22 of an input chute 4 by which an incinerated matter is input into a combustion chamber, and the beam material 23 is fixed on an outer wall part 19 of a furnace main body 1. The lower face 23a of the beam material 23 is formed so as to be flush like with a ceiling face 21a of a refractory material 21 lined on the input chute 4, and a cooling passage 23c by which the air for cooling is supplied to the inside of the beam material 23 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging chute for a fluidized bed incinerator for incinerating incinerated materials such as municipal waste and industrial waste.

[0002]

2. Description of the Related Art Conventionally, an example of a fluidized bed incinerator is disclosed in JP-A-9-292113. This is because, as shown in FIG. 3, a combustion chamber 2 and a freeboard space 3 are provided in the furnace main body 1, and a charging chute 4 for charging the incineration material into the combustion chamber 2 is inclined in the furnace main body 1. The inclined floor section 5 that is provided downward and forms the combustion chamber 2 has a front floor section 5a made of a refractory material that is a dry pyrolysis zone A and a rear floor section that has a large number of dispersion pipes 6 that are a combustion zone B. 5b, and a dispersion pipe 7 and a rear floor 5 arranged on the front floor 5a.
By ejecting fluidized air from the dispersion pipe 6 of b,
The fluidized medium made of silica sand placed on the floor 5 is fluidized to form a fluidized bed S, and the incineration material thrown into the fluidized bed S from the charging chute 4 is incinerated.

[0003] The incineration ash generated by the incineration process falls through the dispersion pipes 6 of the rear floor 5 b, is discharged by a fixed amount discharging device 8, and is sent to a separating device 10 by a screw feeder 9. , Separated from the fluid medium and collected. The separated fluid medium is lifted by the circulation device 11 and returned from the nozzle 12 to the fluidized bed S.

[0004] An exhaust gas port 13 is formed at the top of the furnace main body 1, and a secondary air nozzle 14 and a tertiary air nozzle 15 are provided above the combustion chamber 2 and in the freeboard space 3. The combustion gas is subjected to two-stage combustion with the secondary air and tertiary air supplied from
x is reduced. In addition, 16 is a cooling nozzle for blowing cooling water into the dry pyrolysis zone A, and 17 is a furnace top cooling water nozzle for blowing cooling water into the freeboard space 3 from above.

[0005] The furnace body 1 and the charging chute 4 are shown in FIG.
As shown in (1), it is formed by lining a refractory material 21 on an outer wall portion 19 made of a steel plate via an anchor rod 20.

In order to surely slide down the incineration object along the input chute 4, the inclination angle α of the input chute 4 is larger than the repose angle of the incineration object (about 55 degrees).
°). Therefore, as shown by a virtual line in FIG. 4, the ceiling surface 21 a of the refractory material 21 lining the charging chute 4 is replaced by the inner surface 21 of the refractory material 21 lining the furnace body 1.
When it is extended to "b", the thickness H of the extended portion C becomes too large and cannot be supported by the anchor rod 20.

Therefore, conventionally, as shown in the solid line of FIG. 4 and FIG. 5, the upper edge 22a of the opening 22 on the outlet side of the charging chute 4 is made horizontal, and the thickness of the refractory material 21 forming the upper edge 22a is increased. 400 capable of supporting the thickness h with the anchor rod 20
It is set within ~ 500 mm.

[0008]

In the above-mentioned conventional configuration,
By making the upper edge 22a of the outlet side opening 22 of the charging chute 4 horizontal, the opening height R is increased, so that it is included in the incineration material charged into the charging chute 4 as shown by the arrow a. There is a high possibility that the light-weight refuse to be scattered in the downstream area by the flow of the fluidized air (primary air), the secondary air, the combustion gas, etc. and not taken into the fluidized bed S. Further, as indicated by the arrow b, the secondary air is easily blown into the charging chute 4, and the temperature rise in the charging chute 4 due to radiant heat in the furnace increases.

The present invention has been made in view of the above problems, and provides a charging chute for a fluidized bed incinerator in which lightweight waste is reliably taken into a fluidized bed and secondary air is prevented from being blown into the charging chute. It is intended to be.

[0010]

In order to achieve the above object, the invention according to claim 1 is directed to a fluidized bed type incineration which is installed obliquely downwardly in a furnace body of an incinerator and throws incineration materials into a combustion chamber. A girder material is disposed at an upper edge of an opening on the outlet side of the charging chute, and a chute-side lower surface of the girder material is flush with a ceiling surface of a refractory material lined with the charging chute. In addition, the combustion chamber side surface is formed flush with the inner wall, and a cooling passage for supplying a cooling medium is formed in the beam.

[0011] According to the above configuration, the opening height of the outlet side opening is reduced by the girder material arranged at the upper edge of the outlet side opening of the charging chute, so that the object thrown into the charging chute is formed. Lightweight waste contained in the incineration can be reliably taken into the fluidized bed without being scattered and entrained by the combustion gas in the combustion chamber. The girders also prevent the secondary air blown into the combustion chamber from flowing into the charging chute, and do not block the radiant heat in the furnace and increase the temperature in the charging chute. Further, since the beam is cooled by the cooling medium, the beam is not burned out by radiant heat in the furnace, and the life can be maintained long.

According to a second aspect of the present invention, in the above structure, the beam is provided with a nozzle for injecting a cooling medium in a cooling passage into a combustion chamber. According to the above configuration, a partition layer is formed between the girder and the fluidized bed by the cooling medium injected from the nozzle formed on the girder toward the combustion chamber. Scattering can be more reliably prevented.

[0013] The invention according to claim 3 is characterized in that the beam member having the above-mentioned structure is fixed to an outer wall of the furnace main body. According to the above configuration, since the girder is fixed to the outer wall of the furnace main body and has a rigid structure, the opening height of the outlet side opening of the charging chute can be reliably held as set. .

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a main part of a fluidized bed incinerator according to an embodiment of the present invention.
A hollow girder 23 made of a heat-resistant steel plate is arranged on the upper edge 22a of the outlet side opening 22 of the charging chute 4, and the inside of the girder 23 is formed in a cooling passage 23c. This girder 23
Is fixed to the outer wall portion 19 of the furnace body 1, and the lower surface 23 a of the girder 23 on the side of the chute 4 is formed flush with the ceiling surface 21 a of the refractory material 21 lined with the chute 4. The combustion chamber 2 side surface 23b of 23 is formed flush with the inner surface 21b of the refractory material 21 lined with the furnace main body 1. Further, a plurality of nozzles 24 are formed at predetermined intervals along the longitudinal direction of the girder 23 at the corner between the lower surface 23 a and the side surface 23 b of the girder 23, and the air formed on the girder 23 is formed. The air supplied from the (cooling medium) supply port 25 to the cooling passage 23c is jetted through the nozzle 24 in the chute feed direction. In the configuration other than the above, the same parts as those of the conventional example shown in FIGS.

According to the above construction, the upper edge of the outlet side opening 22 of the input chute 4 is extended by the girder member 23 to reduce the opening height r. Since an air curtain (partition layer) is formed between the girder material 23 and the fluidized bed S, the light-weight refuse contained in the incineration material thrown in from the charging chute 4 as in the related art is subjected to fluidized air (primary air). ), It is not scattered upward along with the flow of the secondary air and the combustion gas and is not discharged as it is without being burned, so that light-weight waste can be reliably taken into the fluidized bed S. Further, the girder member 23 prevents the secondary air of the combustion chamber 2 from being blown into the charging chute 4, and further suppresses the temperature rise in the charging chute 4 because the radiant heat in the furnace is blocked by the girder member 23. Can be.

Further, since the beam 23 is fixed to the outer wall 19 of the furnace main body 1 and has a rigid structure, the opening height r of the outlet side opening 22 can be securely held as set. it can.

Furthermore, since the girder 23 is cooled by supplying air into the girder 23 from the supply port 25, the girder 23 is burned out by radiant heat in the furnace in the furnace body 1. And a long life can be maintained.

In the above-described embodiment, air is supplied as a cooling medium into the beam member 23, but water may be supplied instead of the air.

[0019]

As described above, according to the first aspect of the present invention, the opening height of the outlet side opening is reduced by the girder material arranged on the upper edge of the outlet side opening of the charging chute. As a result, the light-weight waste contained in the incineration material thrown into the throwing chute can be surely taken into the fluidized bed without being accompanied by the combustion gas in the combustion chamber and scattered. The girders also prevent the secondary air blown into the combustion chamber from flowing into the charging chute, and do not block the radiant heat in the furnace and increase the temperature in the charging chute. Further, since the beam is cooled by the cooling medium, the beam is not burned out by radiant heat in the furnace, and the life can be maintained long.

According to the second aspect of the present invention, the partition layer is formed between the beam and the fluidized bed by the cooling medium injected from the nozzle formed in the beam into the combustion chamber. The scattering of light-weight waste contained in the incineration can be more reliably prevented.

According to the third aspect of the present invention, since the girder material is fixed to the outer wall of the furnace body and has a rigid structure, the opening height of the outlet side opening of the charging chute is set as set. It can be securely held.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a charging chute of a fluidized bed incinerator according to an embodiment of the present invention.

FIG. 2 is a front view of an outlet side opening of the charging chute.

FIG. 3 is a longitudinal sectional view showing the whole of the fluidized bed incinerator.

FIG. 4 is a longitudinal sectional view of a main part showing a conventional example.

FIG. 5 is a front view of an outlet side opening of the charging chute.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Combustion chamber 4 Charging chute 5 Floor part 19 Outer wall part of furnace main body 21 Refractory material 21a Ceiling surface of refractory material 22 Outlet opening of charging chute 22a Upper edge of outlet side opening 23 Girder material 23a Girder material Lower surface 23b Side surface of girder material 23c Cooling passage 24 Nozzle S Fluidized bed r Opening height of outlet side opening

Claims (3)

[Claims] 1. An injecting chute for a fluidized bed incinerator which penetrates obliquely downward into a furnace body of an incinerator and injects incineration into a combustion chamber, wherein an upper edge of an outlet opening of the charging chute is provided. A girder material is arranged, and the lower surface of the chute material on the chute side is formed flush with the ceiling surface of the refractory material lined with the charging chute, and the combustion chamber side surface is formed flush with the inner wall, A charging chute for a fluidized bed incinerator, wherein a cooling passage for supplying a cooling medium is formed in the beam. 2. A charging chute for a fluidized bed incinerator according to claim 1, wherein a nozzle for injecting a cooling medium in a cooling passage into a combustion chamber is provided on the beam. 3. The charging chute of a fluidized bed incinerator according to claim 1, wherein said beam material is fixed to an outer wall portion of said furnace main body.