JP4256747B2 - Pyrolysis residue separator - Google Patents

Description

  The present invention relates to a separation apparatus for pyrolysis residues generated when carbon dioxide waste such as waste tires is subjected to dry distillation in an external heating furnace such as a rotary kiln.

In recent years, as part of global environmental measures, attempts have been made to actively use waste such as waste tires as an energy source. When carbonizing waste waste such as waste tires in an external heating furnace such as a rotary kiln, etc. Thermal decomposition residue is generated along with the fuel gas generated in the process.
This pyrolysis residue contains steel cord wires and carbides, which are provided to improve the strength of the tire, and are contained in one piece. Therefore, this pyrolysis residue is reused as an iron source or energy source. It was difficult to use.

Various proposals have conventionally been made regarding the treatment of carbide discharged from a carbonization furnace such as a rotary kiln. For example, Japanese Patent Application Laid-Open No. 2000-192050 discloses a technique in which a lower end of a cylindrical discharge chute of a rotary kiln is submerged in a water tank. This is a carbonization furnace that cools the inside of the chute and prevents the carbide from adhering to the inner surface of the chute and generates a vortex on the water surface of the water tank. A discharge port structure is disclosed.
However, Japanese Patent Laid-Open No. 2000-192050 discloses combustible waste that is selectively collected from general waste (garbage), and this combustible waste is reduced in volume or further shaped into fuel or solid fuel. Since the object to be treated is different from the waste such as waste tires, the method for separating the metal and carbide which is the subject of the present invention has not been studied.
JP 2000-192050 A

  An object of the present invention is to solve the above-described problems of the prior art and to provide an apparatus for separating metal and carbide contained in pyrolysis residue generated when carbonizing waste such as waste tires. To do.

The present invention has been made as a result of intensive studies in order to solve the above-mentioned problems, and is a chute that introduces thermal decomposition residue generated when carbonizing waste such as waste tires into a water tank while blocking it from the outside air. And a paddle provided below the water surface in the chute and rotating to generate a water flow, thereby providing a metal contained in the pyrolysis residue (specifically, for example, a wire-like steel cord, hereinafter referred to as a wire And an apparatus for separating carbide (including carbide powder, for example), the gist of which is as follows.
(1) A separation device for metal wires and carbides contained in pyrolysis residues generated when carbonizing waste tires,
A chute that introduces the pyrolysis residue into the water tank while blocking it from outside air;
A paddle provided below the water surface in the chute and rotating to generate a water flow;
A metal recovery device for recovering the metal wire settled at the bottom of the water tank;
A carbide recovery device for recovering carbide floating on the water surface of the water tank;
The water surface other than the water surface that is blocked by the chute is open to the atmosphere ,
An apparatus for separating a pyrolysis residue, wherein a distance L (mm) between the upper end of the paddle and the water surface and a rotational speed R (rpm) of the paddle satisfy the following expression (A).
L ≧ 1.1 × R-45 (A)
(2) The apparatus for separating a pyrolysis residue according to (1), further comprising a centrifuge for separating the carbide by circulating a liquid containing the carbide in the water tank.

According to the present invention, a chute that introduces a thermal decomposition residue generated when carbonizing waste such as waste tires into the water tank while blocking the outside air, and a water flow that is provided under the water surface in the chute and rotates to flow the water. By providing the paddle to be generated, it is possible to provide a device for separating a metal such as a wire and carbide contained in the pyrolysis residue and a significant industrially useful effect.

Embodiments of the present invention will be described in detail with reference to FIGS.
In the following embodiments, a waste tire will be described as a specific example of waste, but the present invention is not limited to this, and can be applied to waste such as ASR (shredder dust) and waste home appliances.
1 and 2 are diagrams illustrating an embodiment of a thermal decomposition residue separation apparatus according to the present invention. FIG. 1 is an overall view, and FIG. 2 is a detailed view of a chute portion.
1 and FIG. 2, 1 is a chute, 2 is a water tank, 3 is pyrolysis residue, 4 is carbide, 5 is a wire, 6 paddles, 7 is a carbide recovery device, 8 is a bucket, 9 is a wire recovery device, 10 is A washing tank, 11 is a volume reducer, 12 is drained water, 13 is a pump, 14 is a centrifuge, and 15 is a cooler.

For example, in the pyrolysis residue generated when carbonizing waste tires at a high temperature of about 700 ° C. using an external heat type rotary kiln, a wire made of a steel wire having a length of about 1 mmφ and a length of about 50 to 100 mm and a particle size of A 0.2 to 0.4 mm carbide is mixed and included.
The pyrolysis residue after this dry distillation is usually at a high temperature of 400 to 500 ° C. In the present invention, this pyrolysis residue 3 is received in the water tank 2 by the chute 1 that is introduced into the water tank while being cut off from the outside air. By thus sealing the chute 1 with water, it is possible to prevent the dry distillation gas from leaking to the outside.

As shown in detail in FIG. 2, a paddle 6 that rotates to generate a water flow is provided below the water surface in the chute 1. By rotating the paddle 6 and generating a water flow in the chute 1, the pyrolysis residue 3 can be separated into the wire 5 and the carbide 4.
The reason why the paddle 6 is provided below the water surface is to prevent the dry distillation gas from entraining when the upper end of the paddle protrudes above the water surface, thereby generating bubbles and leaking the dry distillation gas to the outside.
In addition, the present inventors have found that there is a preferred range in which the pyrolysis residue can be efficiently separated without involving dry distillation gas, as will be described later, in the installation position and rotation speed of the paddle 6.
Since the separated wire 5 has a large specific gravity, the wire 5 settles on the bottom of the water tank 2, and is transported by, for example, a wire recovery device 9 including a conveyor provided at the bottom of the water tank 2 and recovered in the water washing tank 10.
The wire 5 washed with water in the washing tank 10 can be used as, for example, an iron source used in a steel making process after being compressed by the volume reducer 11.

On the other hand, since the carbide 4 separated by the water flow generated by the paddle 6 has a small specific gravity, it floats in the upper layer of the water tank 2 and is conveyed by a carbide recovery device 7 composed of, for example, a scraper or a conveyor and recovered in the bucket 8. For example, it can be used as pulverized coal used as a fuel in a steelmaking process.
In this way, about 90% of the carbide contained in the pyrolysis residue 3 can be separated and recovered, but the remaining 10% is contained in the waste water from the washing tank 10 and the liquid in the water tank 2 described above. Further, the separation efficiency can be further increased by circulating the liquid in the water tank 2 with the pump 13 and separating the carbides by using the difference in specific gravity by the centrifugal separator 14.
In addition, since the liquid temperature of the water tank 2 rises by the sensible heat brought about by the pyrolysis residue 3, the rise of the liquid temperature can be prevented by providing the cooler 15 in the circulation line.

3 and 4 are diagrams illustrating the positional relationship between the chute and the paddle used in the present invention.
In FIG. 3, for example, a chute 1 is provided from the heating part of the external heat kiln to the bottom of the water tank 2 to shut off from the outside air and sealed with water so that dry distillation gas does not leak.
Since the taper is provided in the chute 1 so that the diameter of the tip end portion is increased, it is possible to prevent the thermal decomposition residue 3 from being blocked in the chute 1.
As shown in FIG. 4, the paddle 6 is installed below the water surface so that the distance (L) from the water surface in the chute 1 is within a certain range, and the distance of each part is shown below.
L: Distance between water surface and top of paddle (mm)
W: Paddle feather length (mm)
D1: Chute immersion depth D2: Chute wall-horizontal distance of paddle tip

Table 1 shows examples of separation using the thermal decomposition residue separation apparatus of the present invention.
As shown in the invention examples No. 1 to No. 3 in Table 1, according to the present invention, the pyrolysis residue can be discharged without any problem up to a tire amount of 120 to 420 kg / h, and the wire and carbide can be separated. In addition, it was confirmed that there was no dry distillation gas leak.

FIG. 5 is a diagram showing the relationship between the paddle rotation speed R (rpm) and the distance L (mm) between the upper end of the paddle and the water surface.
As described above, in order for the paddle not to entrain the bubble of the dry distillation gas, it is necessary to install the paddle so that the upper end of the paddle is below the water surface, so L needs to be in a positive (+) range.
Further, if the paddle rotation speed R (rpm) is increased, bubbles may be trapped even if the paddle upper end is below the water surface. Therefore, the paddle rotation speed R (rpm) and the distance L (mm) between the paddle upper end and the water surface. Is preferably within the range of the shaded portion in FIG. 5, and specifically, it is preferable that the following expression (A) is satisfied.
L ≧ 1.1 × R-45 (A)

1 is an overall view illustrating an embodiment of a thermal decomposition residue separation apparatus of the present invention. It is detail drawing which illustrates embodiment of the separation apparatus of the thermal decomposition residue of this invention. It is a figure which illustrates the positional relationship of the chute | shoot and paddle used for this invention. It is a figure which illustrates the positional relationship of the chute | shoot and paddle used for this invention. It is a figure which shows the relationship between paddle rotation speed R (rpm) and the distance L (mm) between a paddle upper end and a water surface.

Explanation of symbols

1 Chute 2 Water tank 3 Thermal decomposition residue 4 Carbide 5 Wire (metal)
6 Paddle 7 Carbide recovery device 8 Bucket 9 Wire recovery device (metal recovery device)
10 Washing tank 11 Volume reduction machine 12 Drainage after washing 13 Pump 14 Centrifuge 15 Cooler

Claims (2)

A separation apparatus for metal wires and carbides contained in pyrolysis residue generated when carbonizing waste tires,
A chute that introduces the pyrolysis residue into the water tank while blocking it from outside air;
A paddle provided below the water surface in the chute and rotating to generate a water flow;
A metal recovery device for recovering the metal wire settled at the bottom of the water tank;
A carbide recovery device for recovering carbide floating on the water surface of the water tank;
The water surface other than the water surface that is blocked by the chute is open to the atmosphere ,
An apparatus for separating a pyrolysis residue, wherein a distance L (mm) between the upper end of the paddle and the water surface and a rotational speed R (rpm) of the paddle satisfy the following expression (A).
L ≧ 1.1 × R-45 (A)   Furthermore, it has a centrifuge which circulates the liquid containing the carbide | carbonized_material in the said water tank, and isolate | separates a carbide | carbonized_material, The thermal decomposition residue separation apparatus of Claim 1 characterized by the above-mentioned.

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