JPH0318088B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a feeding device for a municipal waste incinerator, which is capable of continuously supplying municipal waste into the incinerator while keeping it airtight.

BACKGROUND TECHNOLOGY In a fluidized bed incinerator for municipal waste, since the combustion rate of municipal waste is high, it is necessary to continuously supply dust with the municipal waste, and the internal pressure of this incinerator is maintained at a slightly negative pressure. Therefore, it is necessary to airtightly supply dust into the furnace.

Typical prior art is, for example, JP-A-61-
Shown in 36615. In this prior art, municipal waste is airtightly conveyed by a horizontally extending screw conveyor, and a frame discharging machine is provided at the exit of the screw conveyor. It has a single screw, and both ends of the screw are pivotally supported at fixed positions. This allows the compressed municipal waste that is intermittently discharged from the outlet of the screw conveyor to be crushed and dispersed and continuously supplied into the furnace.

Problems to be Solved by the Invention In this prior art, both ends of the screw in the crushing and discharging machine are pivotally supported at fixed positions, and therefore, string-like municipal waste tends to get tangled in the screw. If the string becomes entangled with the screw, a large torque will be required to rotate the screw, and there is a risk that the screw will no longer be able to be rotated.

An object of the present invention is to provide a garbage supply device for a municipal waste incinerator that continuously and airtightly conveys municipal waste to the municipal waste incinerator and prevents string-like municipal waste from becoming entangled. That's true.

Means for Solving the Problems The present invention provides a screw conveyor that has a plurality of screws extending in the horizontal direction and transports municipal waste in an airtight manner; This is a garbage supply device for a municipal waste incinerator, characterized in that it has a plurality of screws supported only at their upper ends, and includes means for pulling municipal waste from the outlet and sending it downward.

In a preferred embodiment, the screw conveyor is characterized in that the pitch in the middle of the screw in the axial direction is smaller than the pitch in the remaining portion to improve airtightness against municipal waste.

Effect According to the present invention, municipal waste is conveyed by the screw conveyor, and therefore the municipal waste can be conveyed airtightly. When municipal waste is transported by a screw conveyor, the municipal waste tends to be compressed within the screw conveyor and is intermittently discharged from the exit of the screw conveyor.

In the present invention, at the exit of this screw conveyor,
A plurality of screws extending in the vertical direction are arranged, and the screws have a structure in which only their upper ends are supported, and the screws pull the municipal waste from the outlet of the screw conveyor and send it downward. Therefore, it becomes possible to continuously supply municipal waste, which is sometimes discharged from the screw conveyor intermittently, into the municipal waste incinerator.

Moreover, only the upper ends of the multiple screws extending in the vertical direction are supported, and since these screws send municipal waste downward, string-like municipal garbage is prevented from becoming entangled in the screws.
Even if it tangles, it will immediately fall downward. Therefore, the torque required to rotate the screw does not increase, and the screw does not stop, thereby ensuring continuous supply of municipal waste into the incinerator. It becomes possible.

Embodiment FIG. 1 is a sectional view of a garbage supply device 1 according to an embodiment of the present invention, and FIG. 2 is a plan view of the garbage supply device 1. The municipal waste dropped from the supply port 3 of the hopper 2 is conveyed laterally, horizontally in this embodiment, to the exit 5 side of the screw conveyor 4 by the screw conveyor 4 in an airtight manner, and is then conveyed airtightly to the outlet 5 side of the screw conveyor 4. It is dropped downward 7 by the screw 6 of 35.

FIG. 3 is a sectional view of a fluidized bed incinerator 8 equipped with the waste supply device 1 shown in FIGS. 1 and 2, and FIG. 4 is a plan view of the incinerator 8. The municipal waste is conveyed by the conveyor 9 as shown by the arrow 10, and is dropped into the hopper 2 of the waste supply device 1. Municipal waste is continuously supplied from the waste supply device 1 to the incinerator 8 . A wind box 11 is formed in the lower part of the furnace body of the incinerator 8, and primary air is supplied thereto as shown by an arrow mark 12. Primary air from the wind box 11 is ejected upward from a nozzle 14 formed in the furnace bottom 13. As a result, the municipal waste forms a fluidized bed 15 in the furnace body and is combusted.
This fluidized bed is equipped with a burner 16 and is supplied with secondary air from a nozzle 17. The combustion exhaust gas is discharged from the upper part of the incinerator 8 as shown by the arrow 18.

The screw conveyor 4 has a casing 19 extending laterally from the supply port 3 to the outlet 5, and two screws 20 housed within the casing 19. The screw 20 includes a screw shaft 21 and screw blades 22, 23, 24 spirally attached to the screw shaft 21. The screw shaft 21 is
On the side of the casing 19 opposite the outlet 5, the bearing 2
6,27. Bearings 26, 27
is attached to a mounting member 28 that is integral with the end wall 25 provided at the end of the casing 19 opposite the outlet 5. A gear 2 is attached to the end of the screw shaft 21.
9 are fixed respectively. These gears 29 are
mesh with each other. One screw shaft 21 is rotationally driven by a motor 32 via a sprocket wheel 30 and a chain 31. As a result, the pair of screws 20 are rotationally driven in a direction that moves the dust closer to each other, as indicated by arrows 33 in FIG. Note that in FIG. 2, the hopper 2 is omitted for convenience of illustration.

The screw blade 22 of the screw 20 is connected to the supply port 3
It is located near , and has a pitch p1. The screw blade 23 has a pitch p2, and the casing 1
It is very close to or comes into contact with the high hardness inner circumferential wall 35 of No. 9. The screw blade 24 on the exit 5 side is
Has p3. Pitches p1, p2, and p3 are determined as follows.

p3>p1>p2 (1) In this way, in the screw 20 of the screw conveyor 4, the pitch p2 of the screw blade 23 in the middle of the screw conveyor 4 is the same as the pitch p2 of the screw blade 23 in the middle of the screw conveyor 4.
The pitch is smaller than the pitches p2 and p3 of 24.
As a result, the municipal waste from the supply port 3 is compressed by the screw blade 23, and the airtightness between the municipal waste and the inner wall 35 is improved. The outer diameter of the screw blade 24 is made smaller toward the outlet 5 side, so that the municipal waste compressed in the screw blade 23 can be smoothly transported toward the exit 5.

The end 21a of the screw shaft 21 of the screw 20 on the outlet 5 side is not supported, that is, it is a free end, and the screw shaft 21 is supported by bearings 26, 27.
Since the garbage can be supported in a so-called cantilever manner, the string-like municipal garbage does not get wrapped around the screw 20 and is smoothly conveyed to the exit 5. Therefore, the torque for rotating the screw 20 is
It does not increase in size due to string-like municipal waste becoming entangled, and smooth operation can be continued.

At the outlet 5 of the screw conveyor 4, a discharge means 3 is provided.
5 is provided. This discharge means 35 has a casing 36 attached to the casing 19 of the screw conveyor 4, and two screws 6 extending longitudinally within the casing 36, vertically in this embodiment. This screw 6 includes a screw shaft 37 and a screw blade 38. The upper parts of the screw shafts 37 are respectively fixed to gears 39 that mesh with each other above the casing 36. One screw shaft 37 is rotationally driven by a motor 39a, whereby the screws 6 are rotationally driven in the direction of arrow 40 in FIG. Ru. Therefore, the municipal waste from the outlet 5 of the screw conveyor 4 is sandwiched between the pair of screws 6 and pulled, and is sent below the casing 36. The lower part of the casing 6 is connected to a chute 41 (see FIG. 3) of the incinerator 8. The screw 6 is located close to the outlet 5 and spaced from the inner surface of the casing 36.

The municipal waste discharged from the outlet 5 of the screw conveyor 4 is pulled by the screw 6 in the discharge means 35 and sent downward. As a result, even if municipal waste is discharged from the screw conveyor 4 intermittently, the discharge means 35 can continuously supply the municipal waste into the incinerator 8 via the chute 41. It becomes possible. The lower end of the screw 6 of the discharge means 35 is not supported and is a free end, so even if the municipal waste contains strings, the strings may get tangled with the screw 6 and the driving torque of the screw 6 will be reduced. It will not increase.

In other embodiments of the invention, the screw conveyor 4 and the ejecting means 35 may include a larger number of screws or a single screw.

Effects As described above, according to the present invention, municipal waste can be supplied in an airtight manner by using a screw conveyor, and by providing a discharge means at the outlet of this screw conveyor, municipal waste can be supplied. It becomes possible to supply continuously. Also, according to this method of discharging, even if municipal waste contains string, etc.
This prevents the drive torque from increasing and allows smooth operation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a garbage supply device 1 according to an embodiment of the present invention, FIG. 2 is a plan view of the garbage supply device 1 shown in FIG. 1, and FIG.
Figure 4 is a sectional view showing the state in which it is installed.
FIG. 3 is a plan view of the configuration shown in the figure. 1... Garbage supply device, 2... Hopper, 3... Supply port, 4... Screw conveyor, 5... Outlet,
6, 20... Screw, 35... Discharge means.

Claims (1)

[Scope of Claims] 1. A screw conveyor that has a plurality of screws extending in the horizontal direction and transports municipal waste in an airtight manner, and a screw conveyor that is disposed at the exit of the screw conveyor, extends in the vertical direction, and is supported only at its upper end. What is claimed is: 1. A garbage supply device for a municipal waste incinerator, characterized in that the device has a plurality of screws, and means for pulling municipal waste from the outlet and sending it downward. 2. The screws of the screw conveyor have a pitch in the middle in the axial direction that is smaller than a pitch in the remaining portions to improve airtightness against municipal waste. A garbage supply device for a municipal waste incinerator according to item 1.