JP2001164265A - Waste plastic processing equipment - Google Patents

Abstract

(57) [Problem] To provide a waste plastic processing apparatus in which a gas pipe for guiding a chlorine gas (desalinated gas) generated by a dechlorination treatment to a desalination gas combustion furnace is less likely to be clogged. To do. SOLUTION: The waste plastic processing apparatus 100 of the present invention.
Is provided with a desalination apparatus 1 for decomposing waste plastics by thermal decomposition. Below the desalination apparatus 1, a melting tank 2 for temporarily storing the molten plastic thermally decomposed by the desalination apparatus 1 and the desalination gas is connected. A desalting gas pipe 3 is connected to the upper part of the melting tank 2,
A molten plastic discharge pipe 4 is connected to the bottom of the melting tank 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste plastic processing apparatus for removing harmful chlorine contained in waste plastic to convert waste plastic into a solid fuel or oil.

[0002]

2. Description of the Related Art When converting waste plastics into solid fuel or oil, it is necessary to remove harmful chlorine contained in the waste plastics and detoxify the waste plastics. If such a detoxification process is not performed, not only chlorine gas is generated when the generated solid fuel and oil are burned, but also highly toxic substances such as dioxin may be generated. The detoxification treatment can be performed by thermally decomposing waste plastic to release hydrogen chloride.

[0003] A conventional desalination apparatus for performing such treatment is as follows.
The waste plastic to be fed is heated and desalted, and the plastic melted by heating is sent to the pyrolysis unit.On the other hand, the desalination gas pipe is connected directly to the desalination unit, The chlorine gas generated in the apparatus is sent from the desalination gas pipe to a desalination gas combustion furnace.

[0004]

However, the present inventor has found that the desalination gas pipe is easily clogged when the desalination gas pipe is directly connected to the desalination apparatus.

The present invention has been made in view of the above points, and a gas pipe for guiding chlorine gas (desalted gas) generated by dechlorination to a desalination gas combustion furnace or the like has been developed. It is an object of the present invention to provide a waste plastic processing device configured to be hardly clogged.

[0006]

SUMMARY OF THE INVENTION The present invention provides a desalination apparatus for thermally decomposing waste plastics for dechlorination, and a method for temporarily dissolving molten plastic and desalinated gas in the desalination apparatus. A melting tank for temporarily storing, a desalting gas pipe connected to the melting tank and discharging desalinated gas, and a molten plastic discharge pipe connected to the melting tank and discharging molten plastic, Waste plastic processing equipment.

According to the present invention, the desalination gas generated in the desalination apparatus is once sent to the melting tank, and then sent from the upper part of the melting tank to a desalination gas combustion furnace or the like via a desalination gas pipe. Therefore, clogging of the desalination gas pipe can be effectively avoided.

[0008]

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

FIG. 1 is a schematic configuration diagram showing a waste plastic processing apparatus according to a first embodiment of the present invention. FIG.
As shown in FIG. 1, a waste plastic processing apparatus 100 according to the first embodiment of the present invention includes a desalination apparatus 1 for decomposing a waste plastic by heating and decomposing the same, And a melting tank 2 for temporarily storing the molten plastic thermally decomposed by the desalination apparatus 1 and the desalination gas. Above the desalination device 1, a hopper 1h for charging waste plastic is provided.

A desalting gas pipe 3 is connected to the top of the melting tank 2, and a molten plastic discharge pipe 4 is connected to the bottom of the melting tank 2. Further, the melting tank 2 has a liquid level detecting means 2s for detecting the liquid level of the molten plastic in the melting tank 2.

The desalting apparatus 1 has a first feeding mechanism 11 for feeding the waste plastic to be fed to the melting tank 2 side.
The first feed mechanism 11 includes a first screw feeder shaft 11f
And a first motor 11m that rotationally drives the first screw feeder shaft 11f. The first motor 11m is connected to the first control unit 11c, and is controlled by the first control unit 11c based on the detection result of the liquid level detection unit 2s.

On the other hand, the molten plastic discharge pipe 4 has a valve 4 which opens and closes based on the detection result of the liquid level detecting means 2s.
v is provided. Further, a pyrolysis device 5 is connected to the molten plastic discharge pipe 4. Pyrolysis device 5
Has a second feed mechanism 51 for feeding the molten plastic sent from the melting tank 2 to the inside. Second feed mechanism 51
Has a screw feeder mechanism including a second screw feeder shaft 51f and a second motor 51m that drives the second screw feeder shaft 51f to rotate. The second motor 51m is connected to the second control unit 51c, and is controlled by the second control unit 51c based on the detection result of the liquid level detection unit 2s.

In addition, a stirrer 2a driven by a motor 2m is provided in the melting tank 2. Motor 2
A stirring control unit 2c that controls the motor 2m based on the detection result of the liquid level detection unit 2s is connected to m. The rotation axis of the motor 2m substantially coincides with the axis of the melting tank 2, and an extruder screw 2p is integrally attached to the stirrer 2a.

Next, the operation of the present embodiment having the above configuration will be described.

Waste plastic is supplied from a supply device (not shown) into the desalination device 1 via the hopper 1h. The introduced waste plastic is thermally decomposed by the desalination device 1 and subjected to a dechlorination treatment.

At this time, the first motor 11m operates and the first motor 11m operates.
The screw feeder shaft 11 s sends the desalting gas and the molten plastic generated in the desalting device 1 to the melting tank 2 side. As a result, the desalinated gas and the molten plastic are supplied to the melting tank 2
And is temporarily stored in the melting tank 2.

The desalinated gas is supplied from the melting tank 2 to the desalinated gas pipe 3
And then sent to a desalination gas combustion furnace (not shown). By providing the desalination gas pipe 3 from the melting tank 2 in this way, clogging and blockage of the desalination gas pipe 3 can be effectively avoided.

On the other hand, the molten plastic is sent from the melting tank 2 to the pyrolysis device 5 via the molten plastic discharge pipe 4. At this time, the second motor 51m operates, and the second screw feeder shaft 51s sends the molten plastic sent from the melting tank 2 to the inside of the pyrolysis device 5. The molten plastic is further thermally decomposed by the pyrolysis device 5, separated into oil gas and a residue, and recovered respectively.

In the present embodiment, the liquid level detecting means 2s
The liquid level of the molten plastic in the melting tank 2 is constantly detected. Then, based on the output result of the liquid level detecting means 2s,
The driving of the first motor 11m and the second motor 51m is appropriately controlled by the first controller 11c and the second controller 51c.

In this embodiment, the melting tank 2
By rotating the stirrer 2a in the inside forward, the melting tank 2
It is possible to efficiently move the desalinated gas inside the desalinated gas pipe 3 and efficiently move the molten plastic to the molten plastic discharge pipe 4. The latter effect is more effective especially when the extrusion screw 2p is integrally attached to the stirrer 2a.

On the other hand, when the stirrer 2a is rotated in the reverse direction, the movement of the molten plastic from the melting tank 2 to the molten plastic discharge pipe 4 can be suppressed.

As described above, according to the present embodiment, since the desalinated gas is sent from the upper part of the melting tank 2 to the desalinated gas combustion furnace or the like via the desalinated gas pipe 3, Can be effectively avoided.

Further, the driving of the first motor 11m, the driving of the second motor 51m, the opening and closing of the valve 4v, and the rotation of the stirrer 2a are controlled based on the detection result of the liquid level detecting means 2s, so that the continuous processing can be smoothly performed. Can be implemented.

Next, a waste plastic processing apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of the waste plastic processing apparatus according to the second embodiment.

As shown in FIG. 2, the waste plastic processing apparatus 100 according to the present embodiment includes a first screw feeder 1.
1s, the first motor 11m and the first control unit 11c, instead of the inlet-side screw feeder shaft 61 arranged in series.
a and the outlet-side screw feeder shaft 61b, the inlet-side motor 62a and the outlet-side motor 63a that independently drive the respective screw feeder shafts 61a and 61b, and the respective motors 62a and 62b based on the detection result of the liquid level detecting means 2s. Inlet-side control unit 63a and outlet-side control unit 63 that are controlled independently
Other than having b, the configuration is substantially the same as that of the waste plastic processing apparatus of the first embodiment shown in FIG. In the second embodiment, the same parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

According to the present embodiment, the state of feeding the molten plastic can be changed between the inlet side and the outlet side in the desalting apparatus 1, so that a smoother continuous processing can be realized.

[0027]

According to the present invention, the desalinated gas generated in the desalination apparatus is once sent to the melting tank, and then from the upper part of the melting tank to the desalination gas combustion furnace or the like via the desalting gas pipe. Therefore, clogging of the desalination gas pipe can be effectively avoided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a waste plastic processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a waste plastic processing apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

 1h Hopper 2 Melting tank 2a Stirrer 2p Extrusion screw 3 Demineralization gas pipe 4 Molten plastic discharge pipe 4v Valve 5 Pyrolyzer 11 First feed mechanism 11s First screw feeder 11m First motor 11c First controller 51 Second feed mechanism 51s 2nd screw feeder 51m 2nd motor 51c 2nd control part 61a Inlet side screw feeder shaft 62a Inlet side motor 63a Inlet side control part 61b Outlet side screw feeder shaft 62b Outlet side motor 63b Outlet side control part 100 Waste plastic processing device

Claims (6)

[Claims] 1. A desalination apparatus for thermally decomposing waste plastics for dechlorination, and a melting tank for temporarily storing the molten plastic and desalinated gas thermally decomposed by the desalination apparatus. A waste plastic processing apparatus comprising: a desalting gas pipe connected to a melting tank for discharging desalinated gas; and a molten plastic discharge pipe connected to the melting tank for discharging molten plastic. 2. The melting tank has a liquid level detecting means for detecting a liquid level of the molten plastic in the melting tank, and the desalination device sends the waste plastic to be supplied to the first side of the melting tank. The waste plastic processing apparatus according to claim 1, further comprising a feed mechanism, and a first control unit that controls the first feed mechanism based on a detection result of the liquid level detection unit. 3. The waste plastic processing apparatus according to claim 2, wherein the first feed mechanism has a screw feeder mechanism. 4. The waste plastic processing apparatus according to claim 3, wherein the screw feeder mechanism has an inlet-side screw feeder and an outlet-side screw feeder that are arranged in series and can be independently controlled. 5. The waste plastic processing apparatus according to claim 2, wherein the molten plastic discharge pipe is provided with a valve that opens and closes based on the detection result of the liquid level detecting means. . 6. A pyrolysis device is connected to the molten plastic discharge pipe. The pyrolysis device is based on a second feed mechanism for feeding the molten plastic sent from the melting tank to the inside and a detection result of the liquid level detection means. The waste plastic processing apparatus according to any one of claims 2 to 5, further comprising: a second control unit that controls the second feeding mechanism by using a second control unit.