JP2755548B2 - Fluid bed furnace cleaning equipment - 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 furnace provided with a fluidizing means for flowing a bed material into a furnace. The present invention relates to a cleaning device for discharging lump of objects and ash.

[0002]

2. Description of the Related Art Conventionally, in the case of burning incombustible materials such as metal pieces and ash-containing materials, such as refuse incinerators and boilers provided with a fluidizing means, in the design stage, the dispersion plate is inclined at the design stage. In addition, a gap is provided between the dispersion tube and the hearth so that the incombustible mass such as wire or metal piece flowing into the layer material can be naturally dropped to the lower side by its own weight and discharged.

[0003]

However, during continuous operation for a long period of time, lumps such as wires and metal fragments are caught on the hearth and accumulate, which hinders combustion at the bottom of the furnace. It was extremely difficult to operate continuously for about one year.

The present invention solves the above-mentioned problems, and can effectively prevent non-combustible lumps such as metal chips mixed in a bed material in a furnace from staying. It is an object of the present invention to provide a fluidized-bed furnace cleaning apparatus that can perform the cleaning.

[0005]

In order to solve the above-mentioned problems, a cleaning apparatus for a fluidized-bed furnace according to the present invention is provided with a floor for supporting a bed material from below in a furnace body provided with a bed material flowing means. A cleaning ball supply port is provided on the upper side of the floor that is inclined in the vertical direction, and a cleaning sphere supply port that allows a cleaning sphere heavier than the layer material to be introduced into the fluidized bed is provided. On the upper side of the floor, which is inclined in the vertical direction and provided with a cleaning outlet for discharging stagnant materials and supports the layer material,
A cleaning ball supply port for introducing a large number of cleaning spheres having a larger weight than the bed material into the fluidized bed is provided, and a cleaning outlet for discharging a stagnant together with the cleaning ball is provided on the lower side of the floor. is there.

[0006]

In the above construction, a large number of cleaning spheres are periodically charged into the fluidized bed from the cleaning ball supply port, and settle down in the fluidized bed and descend along the floor surface to thereby reduce the fluidized bed. The cleaning sphere is brought into contact with the non-combustible material or the non-combustible material or the sediment that has begun to accumulate on the floor surface, and a downward force is applied. In this way, by periodically charging the cleaning sphere, the non-combustible material lump adhering to and accumulating on the floor surface can be separated and lowered in the initial stage and discharged. Therefore, it is possible to effectively prevent stagnation of incombustible lumps such as metal pieces mixed in the layer material in the furnace, and it is possible to perform continuous operation without opening for a long period of time.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fluidized bed furnace according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a fluidized-bed refuse incinerator having a dispersion plate. An inclined dispersion plate (floor surface) 3 for supporting a bed material 2 made of sand or the like from below is inclined in a furnace body 1. Fluidized air supplied to the wind box 4 is supplied from the air holes 3 a formed in the inclined dispersion plate 3 to the layer material 2.
It is configured to blow into it to form a fluidized bed.

The upper side wall 1a of the inclined dispersion plate 3 of the furnace body 1
Is provided with a refuse input hopper 5 for inputting refuse, which is an object to be burned, into the furnace main body 1. The refuse input hopper 5 has a larger weight than the layer material 2 and has a diameter of about 8 to 20 mm for cleaning. A cleaning ball supply pipe 7 for feeding the steel ball 6 into the layer material 2 is provided. On the other hand, below the inclined dispersion plate 3 of the furnace main body 1, a cleaning outlet 8 for discharging the cleaning steel ball 6 together with the layer material 2 and the incombustible mass is formed.

At the lower part of the cleaning outlet 8, there is provided an extraction screw feeder 9 in which a screw blade 9b is rotatably arranged in a casing 9a arranged in the horizontal direction. At the outlet, there is provided a discharge separation device 10 that separates the cleaning steel ball 6, the layer material 2, and the non-combustible material and collects the layer material 2 and the cleaning steel ball 6.

The waste separation apparatus 10 includes a casing 11 inclined downward from an inlet 10a to an outlet.
An inclined sieve 13 vibrated by the driving device 12 is arranged, and a layer material collecting port 14, an incombustible material collecting port 15, and a cleaning steel ball collecting port 16 are formed below the inclined sieve 13 in order from an inlet. is there.

In the above configuration, for example, 24 hours
Every time, an amount of cleaning steel balls 6 that can cover the entire surface of the inclined dispersion plate 3 is supplied from the cleaning ball supply port 7 to the fluidized bed in the furnace main body 1 via the dust introduction hopper 5. These cleaning steel balls 6 move down in the layer material 2 flowing by its own weight, and promote the descent of the non-combustible mass that stops in the layer material 2,
It descends along the upper surface of the inclined dispersing plate 3 and contacts an incombustible mass that is to be caught and stay on the inclined dispersing plate 3 to apply acceleration and descend. Then, the layer material 2 and the incombustible mass together with the cleaning steel ball 6 are discharged from the cleaning outlet 8 and sent out to the discharged material separating device 10 by the extracting screw feeder 9. Then, the cleaning steel balls 6 dropped from the inlet 10a of the discharge separation device 10 are
It falls down at high speed along the inclined sieve 12 and is discharged to the cleaning steel ball collection port 16 to be collected and reused. Further, the layer material 2 dropped from the inlet 10a falls from the vibrating inclined sieve 13 and is collected and reused in the layer material collecting port 14. Further, the incombustible material collecting port 15 in which the mesh of the inclined sieve 13 becomes larger is used. And is discharged from the noncombustible material recovery port 15. The cleaning operation needs to be performed periodically so that the cleaning steel ball 6 does not become a residue. In addition, the size, weight, input amount, and the like are appropriately selected so that the inclined dispersion plate 3 is not damaged by the cleaning steel ball 6.

According to the above-described embodiment, the cleaning steel ball 6 is brought into contact with the initial incombustible mass which has been caught on the inclined dispersing plate 3 and has begun to stay, thereby facilitating the descent and discharging. Therefore, the combustion and fluidization of the layer material 2 are not hindered by the incombustible substances that have accumulated on the inclined dispersion plate 3, and a long-time continuous operation without opening is possible.

In the above embodiment, the oscillating inclined screen 13 is employed in the waste separation apparatus 10, but a structure in which the cleaning steel balls 6 are taken out using an electromagnet may be employed. FIGS. 3 and 4 show a fluidized bed type waste incinerator having a dispersion pipe. The bottom plate (floor surface) 22 of the furnace body 21 is inclined such that it becomes lower toward the center from the lower ends of the side walls 23A and 23B. A plurality of dispersion pipes 25 are provided at predetermined positions above the bottom plate 22 through the layer material 24 supported on the bottom plate 22, and are formed by fluidized air injected from air holes 25 a formed in the dispersion pipe 25. It is configured to fluidize the material 24. In addition, a cleaning outlet 26 is provided at the lower end of the bottom plate 22, a dust input hopper 27 is provided on one side wall 23 </ b> A, and the layer material 24 is provided above the other side wall 23 </ b> B. A cleaning ball supply port 29 which can spray the cleaning steel ball 28 almost uniformly over the entire surface is provided at an angle. Further, below the cleaning outlet 25, there are provided an extraction screw feeder 9 and a discharge separation device 10 having the same structure as in the above embodiment. This description is omitted with the same reference numerals.

In this embodiment, the same operation and effect as those of the previous embodiment can be obtained by periodically supplying the cleaning steel ball 28 from the cleaning ball supply port 29 into the layer material 24 of the furnace body 21. .

[0015]

As described above, according to the present invention, a large number of cleaning spheres are periodically supplied from the cleaning ball supply port into the fluidized bed, so that these cleaning steel balls are moved downward in the fluidized bed. Settle down and descend along the floor surface, contact the cleaning steel ball with the incombustible material in the fluidized bed and the incombustible material and sediment that has begun to adhere to the floor surface, apply a descending force, and descend with the cleaning ball. Can be discharged from the cleaning outlet. In this way, by periodically inserting the cleaning sphere, the non-combustible substance lump adhering to and accumulating on the floor surface can be separated and lowered at an initial stage by the cleaning steel ball and discharged. Therefore,
It is possible to effectively prevent stagnation of incombustible lumps such as metal chips mixed in the layer material in the furnace, and it is possible to perform continuous operation without opening for a long period of time.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a dispersion plate type waste incinerator according to the present invention.

FIG. 2 is a front view of the refuse incinerator.

FIG. 3 is a longitudinal sectional view showing a dispersion tube type incinerator according to the present invention.

FIG. 4 is a front view of the refuse incinerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2 layer material 3 Dispersion plate 4 Air hole 5 Garbage input hopper 6 Cleaning steel ball 7 Cleaning ball supply port 8 Cleaning outlet 9 Discharge screw feeder 10 Waste separation device 16 Cleaning steel ball collection port 21 Furnace Main body 22 Bottom plate 24 Layer material 25 Dispersion pipe 27 Cleaning outlet 28 Cleaning steel ball 29 Cleaning ball supply port

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Tanizaki 5-3-28 Nishikujo, Konohana-ku, Osaka-shi, Japan Inside Hitachi Zosen Corporation (56) References Japanese Utility Model No. 2-106594 (JP, U) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) F23C 11/02 F23G 5/30

Claims (1)

(57) [Claims] 1. A cleaning sphere having a larger weight than a layer material on a slope upper side of a floor surface which supports the layer material from below in a furnace body provided with a means for flowing the layer material. Wherein a cleaning ball supply port capable of introducing a cleaning ball into the fluidized bed is provided, and a cleaning outlet for discharging a residue together with the cleaning sphere is provided below the inclined surface of the floor surface. apparatus.