JP7520282B2 - Air-transfer type pellet transfer mechanism - Google Patents

Description

The present invention relates to a mechanism for transporting air-transported synthetic resin fuel pellets (hereinafter referred to as "pellets").

Although various pellet transport mechanisms have been used in the past, no air transport mechanism like that shown in the present invention has been found.

Incineration is one of the methods for treating waste plastics. In this incineration process, pellets are generally sent into an incinerator and burned, and screw conveyors have been widely used as a means for transporting the pellets. However, water cooling means are required to transport the pellets into the high-temperature incinerator, which leads to high costs.
In view of the above, the present invention has been made with the objective of solving the above problems by using an air flow transfer method, and provides a novel and useful means not previously available.

As a means for solving the above problems, the present invention has the following configuration.
A vent pipe for air circulation is provided, and a pellet provider attachment section is provided at an appropriate position on the vent pipe wall. A pellet provider with upper and lower open ends is provided and inserted and fixed to the attachment section, the lower end of the pellet provider is extended to the middle of the vent pipe, and a cut-out section is provided in part of the side wall of the pellet provider by connecting a circular arc-shaped upper edge section located near the side wall with a horizontal straight upper edge section located in the center away from the side wall, and this cut-out section is provided in the downstream direction of the vent pipe, and the distance between the horizontal straight upper edge section near the center of the cut-out section and the lower end of the cut-out section is greater than the distance between the circular arc-shaped upper edge section of the pellet provider and the lower end of the cut-out section, so that pellets supplied into the pellet provider can be efficiently transported through the vent pipe.
The present invention is an air-transfer type pellet transfer mechanism having the above-mentioned configuration.

The present invention has the following effects.
1. Because it is an air conveying system, the pellets can be conveyed more efficiently than in the conventional method using a screw conveyor.
2. Since the pellet provider has a cutout, it is possible to prevent air from moving upward inside the pellet provider.
3. By providing a swash plate, the resistance of the ventilation pipe can be reduced.

FIG. 2 is a plan view of the pellet provider of the present invention; A-A cross section FIG. 1 is a left side view of a pellet provider according to the present invention. 1 is a right side view of a pellet provider according to the present invention; FIG. 1 is a diagram showing a state in which the pellet provider of the present invention is attached (left side view); Overall explanatory diagram of a conventional example Overall structure of the present invention An explanatory diagram of the overall structure of another embodiment of the present invention. An explanatory diagram of the overall structure of another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described.
In the drawings, reference numeral 1 denotes a vent pipe, a metal tube of a specified diameter and length, with a square hole 2 formed in an appropriate position in the upper part of the pipe as a pellet provider attachment portion. Reference numeral 3 denotes a pellet provider. This pellet provider is square and hollow, with a holed square flange 4 at its upper part for attachment to a hopper or the like, the lower part of the flange being square with no bottom, with a left wall 5 on the left and a right wall 6 on the right, with the lower part of the right wall being cut away to form a cut-out portion 7.
Reference numeral 8 denotes a shielding plate portion for preventing air leakage between the pellet provider and the ventilation pipe, which is provided integrally with the right wall.
This pellet provider is inserted into a square hole provided in the vent pipe as shown in FIG. 7, and is positioned so that the center of the vent pipe and the lower end of the provider are on the same horizontal plane, and then secured by welding.
A hopper containing pellets is connected to the flange via a pellet supplying device (not shown), and a blower is connected to the left side of the vent pipe via an appropriate pipe line, and the right side is connected to a combustion furnace via an appropriate pipe body.

Next, the use of the present invention will be described.
Pellets are placed in the hopper, and the pellet supply device is driven while the blower is driven. When the blower is driven, outside air moves through the ventilation pipe and escapes to the right, reaching the combustion furnace and being ejected. When the pellet supply device is driven, the pellets pass through the pellet provider, fall into the ventilation pipe, and are moved to the right by air pressure and supplied to the combustion furnace where they are burned.
The airflow from the blower is compressed by air pressure and becomes a positive pressure higher than atmospheric pressure, but a part of it passes under the pellet provider and changes to a negative pressure direction. However, even though the positive pressure is moving in the negative pressure direction, it is still slightly higher than atmospheric pressure, so if this continues, there will be air that escapes above the pellet provider, which is not desirable. In order to solve this problem, the above-mentioned cutout portion is provided.
In other words, the flow velocity increases in the lower part of the vent pipe and moves in the negative pressure direction, so that the air inside the pellet provider is sucked out through this cut-out portion, causing the pressure inside the provider to drop below atmospheric pressure, thereby offsetting the air escaping upward as described above, and allowing the pellets to move smoothly through the vent pipe into the combustion furnace.

Conventional pellet transfer is as follows.
In Fig. 6, 10 is a combustion furnace, 11 is a screw conveyor connected to the wall of the combustion furnace, 12 is a hopper located above the screw conveyor and connected to the screw conveyor, 13 is a blower for sending outside air into the combustion furnace, and 14 is an ignition burner.
An exhaust port 15 is provided at the top of the combustion furnace wall.
When the ignition burner is ignited, a high-temperature air current enters the furnace, and a swirling current is generated inside the furnace by driving the blower. The pellets in the hopper are sent into the furnace by a screw conveyor, and pellet combustion begins. Once combustion occurs, the heat of combustion keeps the inside of the furnace at a high temperature and the pellets burn continuously, making the use of a burner unnecessary. The high-temperature gas after combustion is exhausted to the outside through the exhaust port. The swirling current combustion method improves combustion efficiency.

Figures 8 and 9 show another embodiment of the present invention. In the first embodiment, the left wall of the pellet provider is positioned vertically inside the vent pipe, and the airflow hits this wall, increasing the pipe resistance and making it easier for vortexes to occur. To avoid this, in the embodiment of Figure 8, a suitable portion of the upper part of the vent pipe is cut obliquely, and an airflow control plate 20 is fixed to this portion, and the lower left part of the pellet provider is fixed to this airflow control plate. This airflow control plate allows the airflow in the vent pipe to move naturally downwards towards the pellet provider without encountering significant resistance, making it possible to reduce pipe resistance, etc.

Figure 9 shows an example where the oblique cutting of the vent pipe is avoided. 21 is a bent airflow control plate, which is integrally provided with an inner plate portion 23 that protrudes obliquely upward from the lower end of a square plate portion 22 having the same width as the left wall of the pellet provider. The square plate portion is fixed perpendicularly to the square hole described in the first example, and the inner plate portion is inscribed in the upper part of the inside of the vent pipe. Therefore, the same effect as the example in Figure 8 can be obtained, but since there is no oblique cutting of the vent pipe, processing is easier. In both the examples in Figures 8 and 9, the oblique tip of the airflow control plate is elliptical.

The present invention has been described above, and its feature is that the pellets are transported by air current, and the transport efficiency is higher than that of the conventional example using a screw conveyor, and it is also advantageous in terms of manufacturing cost. Furthermore, the air pressure inside the vent pipe can be lowered by the cutout provided on the pellet provider, and the pellets can be smoothly moved downward from the hopper.
Although the present invention is intended to transport synthetic resin pellets to a combustion furnace, the mechanism of the present invention is not limited to this and can be applied in various situations. Note that the above-mentioned example is an example of an embodiment, and other similar configurations may be used.
As described above, the present invention provides a novel mechanism that is effective for transporting pellets.

REFERENCE SIGNS LIST 1 vent pipe 1' hollow portion 2 square hole 3 pellet provider 4 flange 5 left wall 6 right wall 7 cut-out portion 8 shielding plate portion 10 combustion furnace 11 screw conveyor 12 hopper 13 blower 14 ignition burner 15 exhaust port 20 airflow control plate 21 bent airflow control plate 22 square plate portion 23 inner plate portion 24 pellets

Claims (1)

an air vent pipe for air circulation, a pellet provider attachment section provided at an appropriate position on a wall of the air vent pipe, a pellet provider with upper and lower open ends inserted and fixed to the attachment section, the lower end of the pellet provider extending to the middle of the air vent pipe , a cut-out section provided in part of a side wall of the pellet provider by connecting a circular arc-shaped upper edge section located in the vicinity of the side wall with a horizontal linear upper edge section located in a central portion away from the side wall, the cut-out section provided in the downstream direction of the air vent pipe, the cut-out section being formed such that the distance between the horizontal linear upper edge section near the central portion of the cut-out section and the lower end of the cut-out section is greater than the distance between the circular arc-shaped upper edge section of the pellet provider and the lower end of the cut-out section, thereby enabling pellets to be supplied into the pellet provider to be efficiently transported through the air vent pipe.

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