JP3074263B2 - Dust feeding device for fluidized bed incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust supply device for supplying waste to a fluidized bed incinerator.

[0002]

2. Description of the Related Art This type of dust feeding apparatus is disclosed, for example, in Japanese Utility Model Laid-Open Publication No.
FIG. 1 shows an embodiment of the present invention, as described in JP-A-73 (JP-A 2), JP-A-61-11519 (JP-A-3) and JP-A-62-120436 (JP-A-4).
When described with reference to the attached to the fluidized bed incinerator A,
A screw feeder 2 is provided below the hopper 1 for storing the refuse a. The refuse a is fed into the fluidized bed incinerator A by the feeder 2 with the hopper 1 filled with the refuse a.

At this time, the refuse a is compressed by the screw 2a of the feeder 2 into a lump, and therefore, as described in the above-mentioned publications, the refuse a faces the extrusion port 3 of the feeder 2,
A rotary blade 4 is provided, and the lump of waste a extruded by the rotary blade 4 is crushed and sent to the furnace A as fine waste a ′ to perform stable combustion.

[0004]

In this dusting apparatus, the degree of compression and the amount of the refuse a to be extruded from the feeder 2 are not constant because the property of the refuse a put into the hopper 1 is not constant. . For this reason, as shown in Publications 3 and 4, when the rotary blade 4 is fixed at a fixed position, the rotary blade 4 is fixed.
When the garbage a is extruded, the garbage a is not crushed and remains in the lump in a lump state at the front side of the extrusion port 3 of the feeder 2 to block. In such a case, the dust feeding device is stopped, the clogging phenomenon is eliminated, and the dust feeding device is driven again. During this time, the refuse a 'is not fed into the furnace A, which causes a problem such as a decrease in work efficiency and a change in combustion state.

[0005] The rotary blade described in Japanese Patent Laid-Open Publication No. H11-107, can be retracted, but the retracting action is not clear, and it is considered that the rotary blade is retracted when the above-mentioned closed state occurs or in the case of repair or the like.

[0006] The rotary blade described in Publication 2 can be advanced and retracted by an air cylinder. However, since the furnace A is driven by a positive pressure, the rotary blade advances to prevent the pressure from leaking to the outside. It functions to close the extrusion port. Also,
There is a statement that the pressure applied to the cylinder is determined by the pressure applied to the rotary blade by the extrusion of the lump of solid a, but this is set to a constant value corresponding to the property of the solid a fed into the hopper 1. It is considered to be decided.

That is, the conventional rotary blade has no function corresponding to the degree of compression and the amount of dust a extruded from the feeder 2 even if the rotary blade is fixed at a predetermined position or can move forward and backward. If the corresponding action is performed, not only the blockage of the feeder 2 but also the crushing action can be made uniform and stable combustion can be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to make a rotary blade perform a crushing action in accordance with the degree of compression and the amount of refuse extruded from a feeder.

[0009]

In order to solve the above-mentioned problems, the present invention firstly moves the rotary blade forward and backward in the direction opposite to the feeder extrusion port in accordance with the dust extrusion pressure from the screw feeder. It was.

[0010] In this way, the degree of compression and the amount change depending on the nature of the refuse, and when the extrusion pressure increases, the rotary blade retreats and reduces the pressure of the refuse extrusion, thereby crushing itself. Continue to maintain the action and send stable and finely crushed refuse to the furnace. For this reason, the clogging of dust between the rotary blade and the feeder is unlikely to occur, and a stable combustion action can be obtained. When the extrusion pressure returns to normal, the rotary blade returns to the home position.

Next, according to the present invention, the pressure for receiving the dust from the rotary blade is made constant. In this way, the crushing action of the rotary blade is stabilized, and more stable crushed refuse is sent to the furnace, so that a more stable burning action can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, a table having the above-mentioned rotary blade is provided so as to be movable in the reciprocating direction of the rotary blade, and a piston rod of a cylinder is connected to the table. It is possible to adopt a configuration in which the cylinder can be moved in the advance / retreat direction, and a predetermined air pressure is applied to the cylinder so that the pressure of the dust on the rotary blade is constant.

When a dust pushing pressure equal to or higher than a predetermined pressure based on the cylinder pressure is applied to the rotary blade, the pushing pressure is applied to the piston rod, so that the piston rod retreats together with the base. When the piston rod retracts, the pressure in the cylinder increases, but the pressure is maintained at a predetermined pressure, for example, is released by a relief valve, so that a predetermined air pressure is always maintained in the cylinder. Further, the dust receiving pressure is reduced due to the retreat of the rotary blade. For this reason, the rotary blade always performs a crushing operation at a fixed dust extrusion pressure.

[0014]

1 to 3 show one embodiment. This embodiment is also provided on a base frame 10 of a refuse charging path B to a fluidized bed incinerator A driven by negative pressure, similarly to the prior art. ing. The base frame 10 is provided with a hopper 1, and a screw feeder 2 is provided below the hopper 1. An ultrasonic level meter (not shown) is attached to the hopper 1, and the level meter controls a garbage feeding conveyer (not shown) so as to always keep the amount of refuse stored in the hopper 1 at a certain level or more. You. By this action, the sealing performance is secured by the dust a and the power consumption of the upstream device is reduced.

The feeder 2 has two screws 2a,
2a, the two screws 2a, 2a
Gears 20a and 20b having different sizes as shown in FIG.
And rotate at different speeds in the direction of the arrow in FIG. At this time, the electric motor of the feeder 2 has a variable speed, and the rotation speed of the screw 2a is controlled by a manual operation in the central control panel or an input signal from an automatic controller to supply refuse a according to the load in the furnace A. I do.

The hopper 1 is provided with a pusher 5 for pushing dust. The pusher 5 comprises an air cylinder 51 and a push rod 52 for a piston rod. As shown by the chain line in FIG.
2 is advanced, and as shown in FIG. 2 and FIG.
a, 2a is surely bitten. The pusher 5 is driven
This is performed by supplying and discharging compressed air to and from the cylinder 51 by the electric switching valve 54 via the flow control valve 53 with a check valve.

A rotary blade 4 is provided at the dust outlet 3 of the feeder 2 so as to be opposed to the rotary blade 4. The rotary blade 4 has radial blades 4a in four equal quantifiers around the blade.
, The extruded trash a is crushed.

The shaft 41 of the rotary blade 4 is mounted on a carriage 42 on the base frame 10.
The rotary blade 4 is rotated at a required speed via a sprocket 44 and a chain 45 by an electric motor 43 on the carriage 42. Instead of the carriage 42, it may be a mount that slides on the base frame 10. In the figure, 43a is a gear box.

An air cylinder 6 is installed on the base frame 10 behind a carriage 42, and a piston rod 61 of the air cylinder 6 is connected to the carriage 42. The carriage 42 moves as the piston rod 61 advances and retreats. Then, the rotary blade 4 comes into contact with and separates from the extrusion port 3 of the feeder 2. Compressed air is supplied to and discharged from the air cylinder 6 by a motor-operated switching valve 64 via a flow control valve 62 with a check valve and a relief valve 63, and by this switching, the piston rod 61 moves forward and backward. In the figure, 65 is a pressure gauge and 66 is a silencer.

The set pressure of the relief valve 63 is appropriately determined by an experiment or the like so that the rotary blade 4 corresponds to the maximum value of the dust receiving pressure at which the dust a is smoothly broken at a predetermined position (solid line in FIG. 1). For example, in the range of 0.5~1.0kg / cm ^2, and 0.8 kg / cm ² approximately. For this reason, when the degree of dust compression and the amount of dust from the feeder 2 increases and the pressure of the dust to be extruded to the rotary blade 4 becomes higher than the pressure of the dust extruded by the set pressure of the relief valve 63, the pressure in the cylinder 6 increases. 63 releases the pressure, whereby the piston rod 61 retreats, the carriage 42 moves as shown by the arrow, and the rotary blade 4 separates from the extrusion port 3 to reduce the pressure of dust extruded from the feeder 2 to equalize the pressure with the set pressure. Stop at the right position. When the dust pushing pressure decreases, the carriage 42 moves forward to bring the rotary blade 4 closer to the pushing port 3 and stops at a position balanced with the set pressure or at a solid line position.

That is, by the action of the relief valve 63,
The rotary blade 4 is driven by dust pressure from the feeder 2,
It retreats to a required position on the rear side in the opposite direction, and the extruded dust pressure received by itself (refuse extruded pressure) is made constant to perform a crushing action. If the dust blocking state continues between the feeder 2 and the rotary blade 4 and the dust pushing pressure exceeds an allowable range, a switching signal is output by a detection signal indicating that the load current of the electric motor 43 has exceeded a required value. 64, the compressed air is exchanged into the cylinder 6 and the piston rod 6
1 is retracted by the maximum stroke to eliminate the closed state.

When the dust pushing pressure from the feeder 2 is increased, the fact is detected by detecting the amount of movement of the piston rod 61 and the like, and the rotation speed of the rotary blade 4 is increased to promote the crushing action. It can also be done. The function of increasing the number of revolutions in accordance with the dust pushing pressure from the feeder 2 may be provided alone or in combination with the function of the rotary blade 4 according to the present invention to advance and retreat.

In place of the air cylinder 6, FIG.
The spring damper 6a shown in FIG. In this case, the advance / retreat degree of the rotary blade 4 is determined according to the spring pressure.

[0024]

According to the present invention, the rotary blade is advanced and retracted in accordance with the degree of compression and the amount of the dust pushed out from the feeder, so that the dust can be smoothly crushed. , Stable combustion action can be ensured.

[Brief description of the drawings]

FIG. 1 is a schematic front view of one embodiment.

FIG. 2 is a schematic plan view of the embodiment.

FIGS. 3 (a) and 3 (b) are cutaway side views of main parts of the embodiment.

FIG. 4 is a schematic front view of a main part of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust hopper 2 Screw feeder 2a Screw 3 Screw feeder extruder 4 Rotary blade 5 Dust pushing pusher 6 Rotary blade advance / retreat air cylinder 42 Rotary blade support cart 43 Rotary blade electric motor 51 Pusher air cylinder 52 Pusher push rod 61 Piston rod 63 Relief valve for refuse extrusion receiving pressure setting a Refuse a 'Crushed refuse A Fluidized bed incinerator

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Chisato Dono 1-12-19 Kitahorie, Nishi-ku, Osaka-shi Inside Kurimoto Iron Works Co., Ltd. (56) References JP-A-48-99873 (JP, A) Hei 1-92113 (JP, A) JP-A-61-263501 (JP, A) JP-A-61-11519 (JP, A) JP-A-53-20668 (JP, A) , U) Japanese Utility Model Showa 52-102865 (JP, U) Japanese Utility Model Hei 6-14731 (JP, U) Japanese Utility Model Showa 62-112433 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) B65F 5/00 B65G 33/18 B65G 65/46 B65G 69/14 F23G 5/44

Claims (3)

(57) [Claims] 1. A screw feeder (2) for supplying the waste (a) to a fluidized bed incinerator (A) is provided at a lower portion of a hopper (1) containing the waste (a). A fluid feeder provided with a rotary blade (4) for crushing rubbish (a), wherein the rotary blade (4) advances and retreats in the opposite direction according to a dust pushing pressure from the screw feeder (2). Dust supply device for incinerators. 2. The dusting device for a fluidized bed incinerator according to claim 1, wherein the pressure of the waste extruded at the rotary blade is made constant. 3. A table 42 having the rotary blade 4 is provided so as to be movable in the direction in which the rotary blade 4 advances and retreats. A piston rod 61 of a cylinder 6 is connected to the table 42, and the table 42 is The fluidized bed incinerator according to claim 2, wherein the cylinder (6) is movable in the forward and backward directions, and a predetermined pressure is applied to the cylinder (6) so that the pressure of the refuse extruded by the rotary blade (4) becomes constant. Dust feeding device.