JPS5932814Y2 - Dust supply device in fluidized bed incinerator - Google Patents

Description

[Detailed description of the invention] This invention is a fluidized bed incinerator that incinerates waste by forming a fluidized bed with a fluidized medium of solid particles such as sand in the furnace, and the crushed waste is fed into the furnace. This relates to a dust supply device.

In recent years, the amount of waste generated in the course of citizens' daily lives, so-called municipal waste, has continued to increase, reflecting factors such as mass consumption, the spread of disposable habits, and the shrinking of housing due to urban overcrowding. Therefore, efficient processing is required.

Fluidized bed incinerators have attracted attention and are widely used as incinerators for treating municipal waste and industrial waste because they have many features such as high incineration efficiency and little incineration residue.

Figure 1 is a schematic cross-sectional view of a fluidized bed incinerator, and to explain it based on this diagram, the combustion inside the furnace 1, which is built in triple layers with refractory bricks and heat insulating materials and covered with steel plates. The chamber consists of a freeboard section 2 in the upper half and a fluidized bed section 3 in the lower half,
The fluidized bed section 3 is filled with sand.

At the top of this furnace 1 are nozzles 4 for cooling water injection, and nozzles 5 for secondary air blowing. A burner 7 is provided from the outer wall of the fluidized bed section 3.
is inserted into the furnace 1.

Furthermore, a discharge port 10 of a dust supply device 9 connected to the conveyor 8 is opened at the lower end of the freeboard section 2 .

A fluidized air dispersion device 13 equipped with a secondary air supply port 11 and a plurality of water spray nozzles 12 is attached to the lower end opening of the furnace 1, and a funnel-shaped extraction port 1 is installed below the fluidized air distribution device 13.
4 is installed.

A noncombustible material extraction device 15 is installed at the lower end of the extraction port 14, and a noncombustible material sieving device 16 is provided below the device 15.

A sand circulation conveyor 17 extends upward from the discharge port at the lower end of the incombustible material sieving machine 16, and a reduction pipe 18 connected to the upper end of the conveyor 17 connects to the freeboard section 2 of the furnace 1.
It is opened to

In the incinerator configured in this way, the crushed waste is crushed by a separate crusher and sent by the conveyor 8.
When sand is supplied into the furnace 1 by the dust supply device 9, the sand is stirred and heated by the air injected from the aeration nozzle 12 and the heating by the burner 7 into the fluidized bed section 3 of the furnace 1 to form a heated fluidized bed. is formed, the crushed waste is instantly dried and incinerated, and is further completely incinerated in the high-temperature freeboard section 2.

High-temperature exhaust gas containing ash from the incineration of empty cars is discharged from the exhaust port 6, and after being cooled, heat exchanged, and ash removed, it is discharged from the chimney.

In addition, noncombustible materials such as glass, ceramic pieces, and metals contained in the shredded waste are supplied in appropriate amounts to the noncombustible material sieving machine 17 through the extraction port 14 and the noncombustible material extraction device 15 along with the sand.
The sand sorted by the internal screen is transported to the sand circulation conveyor 17.
The iron content is returned to the inside of the furnace 1, and the non-combustible content remaining after the sorting is discharged outside the machine, and the iron content is recovered therein.

The dust supply device 9 in the fluidized bed incinerator roughly configured as described above includes a rotating body 9b that is mounted on a shaft within a casing 9a.
The crushed waste supplied from the upper end opening into the casing 9a by the conveyor 8 is transferred to the rotating body 9b.
However, the conventional rotary body 9b has a plurality of plate-like blades projecting radially from the rotating shaft, and these blades scrape together the crushed garbage and send it into the furnace 1. The solid matter inside was often caught between the blades and the casing 9a, resulting in overload and damage to the motor for driving the rotating body.

The present invention was developed in view of the above points, and the rotating body that rotates inside the casing and sends the crushed waste into the furnace is
It consists of a rotating shaft and a plurality of chain-like bodies whose base ends are supported by the rotating shaft and are arranged in parallel in the axial direction.The chain-like bodies protrude in the radial direction due to rotational centrifugal force. Fluidized bed incineration allows shredded waste to be smoothly distributed and fed into the furnace without solid matter being caught between the rotating body and the casing. The present invention provides a dust supply device for a furnace.

Embodiments of the present invention will be described in detail below with reference to the drawings.

2 and 3 show an embodiment of the dust supply device according to the present invention, FIG. 1 is a front view thereof, and FIG. 2 is a sectional view taken along the line AA in FIG. 1.

Incidentally, since the structure of the entire incinerator has been explained based on FIG. 1, the explanation thereof will be omitted, and the explanation will be made later using the same figure when necessary.

In the figure, the dust supply device 21 includes a base 22 fixed to the furnace 1 side, and a motor pedestal 23 and a bearing pedestal 24 are respectively erected at each longitudinal end of the base 22.

Further, between the motor pedestal 23 and the bearing pedestal 24, a casing 27 is provided with an opening flange 25 connected to the discharge port on the conveyor 8 side and an opening flange 26 connected to the supply port on the furnace 1 side. is reinforced with ribs 28 and formed integrally with the base 22.

A continuously variable transmission 30 with a motor 29 directly connected to the input shaft is fixed on the motor pedestal 23, and a bearing 31 is mounted on the other end of the motor pedestal 23 and on the bearing pedestal 24. and 32 are fixed respectively.

A hollow rotating shaft 35 that passes through the casing 27 and is connected to the output shaft 33 of the continuously variable transmission 30 by a coupling 34 is supported by the bearings 31 and 32 on both sides, and a hollow rotating shaft 35 is supported inside the shaft. A cooling pipe 36 is supported by and penetrates a rotary joint 44, which will be described later.

What is generally designated by the reference numeral 37 is a rotating body that is provided inside the casing 27 and rotates integrally with the rotating shaft 35 in the direction shown by arrow B in the figure.
It is equipped with a pipe 38 integrally formed with a large diameter inside, and the portions where the circumferential surface of the rotary pipe 38 is equally divided into four in the circumferential direction are reinforced with a plurality of ribs 39 arranged in parallel in the axial direction. A support plate 40 is provided to protrude over the entire length of the rotary pipe 38.

A plurality of link chains 41, each shown as an example of a chain body, are arranged in parallel at regular intervals on each support plate 40.

This link chain 41 is a well-known link chain in which a plurality of links 41a formed in an oval ring shape are connected, and a mounting plate 41b welded to the base end is riveted to the support plate 40. As the rotary pipe 38 rotates, the rotary centrifugal force causes the rotary pipe 38 to stand up, become rod-shaped, and protrude in the radial direction as shown in the figure.

A window 42 for inspection, cleaning, and maintenance is opened in the casing 27, and this window 42 is connected to a removable lid 4.
It is blocked by 3.

Further, 44 supports the rotating shaft 35 and supports the bearings 31 and 32.
A rotary joint through which cooling water passes, a cooling water port 45 provided therein is connected to the cooling pipe 36, and a cooling water outlet 46 is connected to the inside of the rotating shaft 35 and the rotating pipe 38. It is communicated.

The operation of the dust supply device 21 configured as above will be explained.

When the motor 29 is started, its rotation is controlled by the stepless reducer 30.
The rotation of the output shaft 33 that has been decelerated is transmitted to the rotating shaft 35 via the coupling 34 .

Therefore, the rotating body 37 integrated with the rotating shaft 35 rotates, and the link chain 41 stands up due to the centrifugal force of the rotation, and rotates in the radial direction without projecting in the form of a rod.

Therefore, when the crushed waste is supplied from the opening flange 25 by the conveyor 8, the rotary body 37 rotates at high speed while raising the link chain 41 as if swinging a weight, so that the crushed waste is removed when the link chain 41 collides with it. Then, at that moment, the link chain 41 is thrown into the furnace 1 due to the momentum of the multiplicative product of the weight and speed of the link chain 41.

Therefore, the crushed waste is uniformly distributed and supplied to the inside of the furnace 1.

Even if the solid material is supplied from the conveyor 8 and cannot be scooped up by one link chain 41, the link chain 41 passes through the link chain 41 while being bent, and the solid material is transferred to the link chain that goes around one after another. 41 and is gradually pushed out and eventually thrown into the furnace 1.

That is, solid matter will not get caught between the rotating body 41 and the casing 27.

In this embodiment, an example is shown in which a link chain 41 is used as the chain body, but the link chain 41 is not limited to this. For example, as shown in FIG. 4, a plurality of link plates 47 a It is also possible to use a chain-like body such as a roller chain 47 connected with link pins 47b, or a conveyor link chain 48 with long leak plays (48a) connected with link pins 48b as shown in FIG. good.

For these chains 47.48, link pin 47
b, 48b are mounted so as to be parallel to the rotating shaft 35.

As is clear from the above explanation, according to the present invention, in a dust supply device for a fluidized bed incinerator, a rotating body that rotates within a casing and feeds crushed waste into the furnace is connected to a rotating shaft and It is composed of a plurality of chain-like bodies that are supported at their base ends and are arranged in parallel in the axial direction, and the chain-like bodies that become rod-shaped due to rotational centrifugal force and protrude in the radial direction are used to scrape crushed waste into the furnace. With this structure, even if solids are fed into the casing, the solids will be blown into the furnace by the large momentum of the collision of the chain bodies rotating at high speed, so that crushed waste will not be trapped inside the furnace. Dispersion improves incineration efficiency, and even if the crushed waste does not move after a single collision, the chain body passes through it while bending, and the crushed garbage does not get caught between the rotating body and the casing. The drive source of the rotating body is not overloaded, and damage to the motor can be prevented.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a fluidized bed incinerator, Figs. 2 to 5 show an embodiment of a dust supply device for a fluidized bed incinerator according to the present invention, and Fig. 2 is a front view thereof. Figure 3 is A-A in Figure 2.
The sectional view, FIG. 4, and FIG. 5 are a front view and a side view, respectively, of a chain body showing other embodiments of the present invention. 1... Fluidized bed incinerator, 2... Furnace, 2
1... Dust supply device, 35... Rotating shaft, 3
7... Rotating body, 38... Rotating pipe,
41...Link chain, 47...Roller chain, 48...Link chain for conveyor.

Claims (1)

[Scope of utility model registration request] The rotating body that rotates inside the casing and sends the crushed waste into the furnace is connected to a rotating shaft, and the base end is supported by the rotating shaft, and the rotating body is arranged in parallel in the axial direction, and the rotational centrifugal force of the rotating shaft causes the rotating body to become rod-shaped in the radial direction. 1. A dust supply device for a fluidized bed incinerator, characterized by comprising a plurality of protruding chain bodies.