JP2542340B2 - Waste Styrofoam Liquefaction Reduction Method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste styrofoam liquefaction reduction method for liquefying the waste of styrofoam widely used as various containers and packing materials.

[0002]

2. Description of the Related Art Conventionally, as a method for treating styrofoam waste, a thermal decomposition treatment method of thermally decomposing styrofoam by heating to high temperature or pressurizing to high pressure has been adopted.

[0003]

However, the conventional thermal decomposition treatment method has the following problems. The most important factor in pyrolysis is the heating technology.The greater the temperature difference between the outside temperature and the inside temperature, the higher the heat exchange rate, but the higher the carbon generation rate and the more solidified Styrofoam. Due to its nature, high pyrolysis treatment causes carbon to adhere and deposit on the inner surface of the pipe, which results in a poor product recovery rate and requires frequent carbon removal work, so continuous treatment is not possible. It is inefficient.

Since it is not a liquefaction process, it requires a large amount of time and labor because it requires a work for removing foreign matters such as a label and an adhesive tape attached to the waste expanded polystyrene in advance and a cleaning work.

Since it is a high thermal decomposition treatment, there is a risk of fire, and since the generated treatment liquid becomes a solid at room temperature, an extra treatment thereafter is required.
In the thermal decomposition by low-temperature heating, generation of carbon and solidification can be avoided, but another problem occurs that operating efficiency is significantly reduced.

In view of the above, the present invention solves the above problems and provides a waste styrofoam liquefaction reduction method which can efficiently obtain a liquid product liquid, has a high recovery rate, and is excellent in safety. It is intended.

[0007]

In order to achieve the above object, the waste styrofoam liquefaction reduction method according to claim 1 of the present invention comprises a first step of crushing styrofoam with a crusher, and a crushed styrofoam net container. By injecting styrene liquid in a state of being housed inside and dissolving the styrofoam in a liquid state, foreign substances other than styrofoam are left in the net container, and the styrene solution in which the styrofoam is dissolved is separated and recovered by passing through the net container. In the second step, the styrene solution is released into the vacuum tank while being heated at a low temperature to decompose a part of the styrene solution into a gas, while the styrene solution is housed in the vacuum tank and decomposed. The third step of returning the styrene gas to the styrene liquid by sucking the styrene gas from the vacuum tank and releasing it into the tank at room temperature and normal pressure, and In a state of being released vacuum of links, and consists of a fourth step takes out the product solution composed of styrene solution accommodated in the vacuum tank to the outside.

[0008]

In the waste styrofoam liquefaction reduction method according to claim 1 of the present invention, the steps described above are performed. First, the styrofoam crushed in the first step is accommodated in the net container in the second step. Styrofoam is dissolved in a liquid state by spraying with styrene, so that foreign substances other than Styrofoam are left in the net container, and the Styrol solution in which Styrofoam is dissolved is separated and collected by passing through the net container. can do. That is, it is possible to omit the troublesome work of previously removing or cleaning foreign matters such as labels and adhesive tapes attached to the waste Styrofoam, whereby the work efficiency can be improved.

Next, in the third step, the styrene solution is discharged into the vacuum tank while being heated at a low temperature, so that the thermal decomposition rate can be increased and the decomposition reaction can be enhanced even at a low temperature. While efficiently decomposing part of the styrene liquid into a gaseous state, the styrene solution is stored in the vacuum tank and styrene gas is sucked from the vacuum tank and released into the tank at room temperature and normal pressure. Return to styrene liquid with. That is, since it is pyrolyzed at a low temperature, generation of carbon in the pipe can be prevented, and it can be efficiently recovered as a production liquid composed of a styrene solution.

The product liquid made of the styrene solution contained in the vacuum tank is taken out to the outside in the fourth step while the vacuum state of the vacuum tank is released. Therefore, the waste styrofoam liquefaction reduction method of the present invention is capable of efficiently obtaining a liquid production liquid, having a high recovery rate, and being excellent in safety.

[0011]

FIG. 1 is a structural explanatory view showing a waste styrofoam liquefaction reduction apparatus for carrying out the waste styrofoam liquefaction reduction method of one embodiment of the present invention, in which 1 is a crusher, 2 is a net container, 3 is a styrene tank, 4 is a styrene injection device, 5 is a vacuum tank, and 6 is a low temperature heating device.

The crusher 1 is provided on the upper part of the net container 2 and crushes the waste styrofoam charged from the charging port 1a by the rotary blade 1b and drops it into the net container 2.

The net container 2 is provided with a net 2a for receiving the crushed styrofoam H in the middle of the net, and a dust collecting port 2b which can be opened and closed by a door is provided on an upper side wall of the net 2a. In the lower part of the net 2a, a housing portion 2 for housing a styrene solution in which a styrene component is dissolved
c is provided.

The styrene tank 3 is a container containing a styrene liquid, and a circulation for circulating the styrene liquid from the inside of the styrene tank 3 to the housing 2c between the styrene tank 3 and the housing 2c. A pipe 3a, a circulation pump 3b, and a circulation amount adjustment valve 3c are provided.

In the styrene injection device 4, the styrene liquid stored in the storage portion 2c is transferred from the upper part of the net container 2 to the net 2a.
It is composed of a styrene injection port 4a for injecting in a shower shape in a direction, a styrene injection pump 4b, and a styrene injection speed adjusting valve 4c.

The vacuum tank 5 is a container 2 for the net container 2.
A closed tank for sucking the styrene solution from c through the flow pipe 5a, the suction side of the vacuum pump 5b is connected to the upper part of one side wall, and the discharge side of the vacuum pump 5b is an open / close valve. While being connected to the inner bottom of the styrene tank 3 via 5c, it is open to the atmosphere via an exhaust valve 5d. A discharge valve 5e for discharging the produced liquid is provided on the lower side wall of the vacuum tank 5, and a discharge valve 3d for discharging the styrene liquid is provided on the lower side wall of the styrene tank 3 in common. The respective discharge pumps 5f are configured to perform discharge. An air intake valve 5g is provided on the upper wall of the vacuum tank 5, and a water drain valve 5h is provided on the lower end of the side wall.

The low-temperature heating device 6 includes a boiler 6a,
65 ° C to 7 ° C due to steam generated in the boiler 6a
A hot water tank 6b containing hot water heated to 5 ° C. and a part of the distribution pipe 5a inserted in the hot water tank 6b in a zigzag state. The distribution pipe is sucked from the housing 2c. The styrene solution flowing through 5a is heated to a low temperature of 40 ° C to 50 ° C.

In the figure, 6c is a styrene solution inflow control valve, 6d is a gas control valve, 6e is an opening / closing valve for cleaning, and in the figure,
3d is a connection pipe that connects between the styrene solution inflow control valve 6c and the opening / closing valve 6e in the circulation pipe 3a and the distribution pipe 5a.
An opening / closing valve 3e is provided at d.

Next, the waste styrofoam liquefaction reduction method by the waste styrofoam liquefaction reduction apparatus of the embodiment will be described. First, in the first step, the input port 1a of the crusher 1
When waste Styrofoam H is thrown in sequentially from the
The waste expanded polystyrene H is crushed into small pieces by b and falls onto the net 2a of the net container 2.

In the subsequent second step, the styrene liquid is dissolved in a liquid state by injecting the styrene liquid in a shower shape toward the Styrofoam H received on the net 2a of the net container 2 by the styrene injection device 4. As a result, the foreign matters other than the styrofoam are left on the net 2a, and the styrene solution in which the styrofoam is dissolved is passed through the net 2a and dropped into the accommodation portion 2c for separation and recovery. The foreign matter remaining on the net 2a is regularly collected from the dust collecting port 2b to the outside. That is, it is possible to omit the troublesome work of previously removing or cleaning foreign matters such as labels and adhesive tapes attached to the waste Styrofoam, whereby the work efficiency can be improved.

In the subsequent third step, the styrene solution is discharged into the vacuum tank 5 while being heated at a low temperature by the low-temperature heating device 6 to enhance the thermal decomposition rate and enhance the decomposition reaction even at a low temperature. With this, a part of the styrene liquid is efficiently decomposed into a gas, while the styrene solution is contained in the bottom of the vehicle empty tank 5, and
Styrene gas is sucked from the vacuum tank 5 and released into the styrene tank 3 at room temperature and atmospheric pressure to be returned to the styrene liquid. That is, since it is pyrolyzed at a low temperature, it is possible to prevent the generation of carbon in the pipe and collect it as a styrene solution.

In the subsequent fourth step, the product liquid made of the styrene solution stored in the vacuum tank 5 periodically stops the operation of the entire apparatus, and the air suction valve 5g
Is opened to release the vacuum state of the vacuum tank 5, and the discharge valve 5e is opened to drive the discharge pump 5f to take it out to the outside.

In the waste expanded polystyrene liquefaction reduction apparatus of this embodiment, the inside of the distribution pipe 5a can be cleaned if necessary. That is,
The operation of the crusher 1 and the styrene injection device 4 is stopped, and the opening / closing valve 3e on the side of the connection pipe 3d is opened while the opening / closing valve 6e is closed to operate other devices. The styrene liquid is passed through the circulation pipe 3a and the connection pipe 3d to the distribution pipe 5a.
The cleaning of the inside of the distribution pipe 5a is carried out by feeding it to the.

As explained above, the waste styrofoam liquefaction reduction method of the present invention is capable of efficiently obtaining a liquid product liquid, having a high recovery ratio of the product liquid, and being excellent in safety.

[0025]

As described above, in the waste styrofoam liquefaction reduction method of the present invention, the styrofoam crushed in the first step is sprayed with the styrene liquid in the state of being housed in the net container in the second step. By dissolving the liquid in a liquid form, foreign substances other than styrofoam are left in the net container, and the styrene solution in which the styrofoam is dissolved is separated and collected by passing through the net container, such as a label or an adhesive tape attached to the waste styrofoam. The troublesome work of previously removing or cleaning the foreign matter can be omitted, and thus the work efficiency can be improved.

In the subsequent third step, the styrene solution is discharged into the vacuum tank while being heated at a low temperature, so that the thermal decomposition rate can be increased and the decomposition reaction can be enhanced even at a low temperature. , It is possible to efficiently decompose a part of the styrene liquid into a gaseous state and release it into a tank at room temperature and normal pressure to return it to the styrene liquid.
Since it is pyrolyzed at a low temperature, generation of carbon in the pipe can be prevented, and it can be efficiently recovered as a production liquid composed of a styrene solution.

Since it is heated at a low temperature, it is an excellent method in terms of safety.

[Brief description of drawings]

FIG. 1 is a structural diagram showing a waste expanded polystyrene liquefaction reduction apparatus used for carrying out a waste expanded polystyrene liquefaction reduction method according to an embodiment of the present invention.

[Explanation of symbols]

 H Styrofoam 1 Crusher 2 Mesh container 3 Styrene tank (Temperature and normal pressure tank) 5 Vacuum tank

Claims (1)

(57) [Claims] 1. A first crushing machine for styrofoam using a crusher.
Steps and by dissolving the styrene foam in a liquid state by injecting styrene liquid in a state where the crushed Styrofoam is stored in a net container, foreign substances other than Styrofoam are left in the net container, and the Styrol solution in which the Styrofoam is dissolved is The second step of separating and collecting by passing through a net container, and discharging the styrene solution into the vacuum tank while heating it at a low temperature to decompose a part of the styrene solution into a gaseous state, while The third step of storing the styrene gas in the vacuum tank and returning it to the styrene liquid by sucking the decomposed styrene gas from the vacuum tank and releasing it into the tank at room temperature and normal pressure, and releasing the vacuum state of the vacuum tank. And a fourth step of taking out a production liquid composed of the styrene solution stored in the vacuum tank to the outside in the state. Styrofoam liquefaction reduction method.