JP3500487B2 - Equipment for removing low boiling components from waste plastic oil products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION One of the effective uses of waste plastics is a method of thermally decomposing the waste plastics and using them as oil. The decomposition products obtained by this thermal decomposition consist of a wide variety of substances from low-boiling components that are gaseous at room temperature to high-boiling oils that are liquid or solid.

The present invention relates to an apparatus for removing the low boiling point components contained in the product obtained by pyrolyzing and converting waste plastics to enhance the safety of the oiled product during transportation and storage.

[0003]

2. Description of the Related Art According to the method for thermally decomposing waste plastics, oil having a wide range of boiling point distribution is produced, of which 20 to 50% is gasoline component. Therefore, most of the produced oils have a flash point of 0 ° C or lower,
During transportation and storage, there is a risk of ignition due to light components, and careful and troublesome handling equivalent to that of gasoline was required.

The present invention has been made in view of the above problems, and in order to obtain a waste plastic pyrolysis product oil having a high flash point and excellent safety during transportation and storage, To a device for removing low boiling point components of

[0005]

In order to achieve the above-mentioned object, the apparatus for removing low boiling point components from waste plastic oiled products according to the present invention collects the gaseous thermal decomposition products of waste plastics and recovers them. The recovery tank for the produced oil has a stripping gas blowing port for expelling the low boiling point component in the produced oil and a discharge port for the stripping gas containing the low boiling point component. .

In the above apparatus, as the stripping gas, it is preferable to use an inert gas such as nitrogen gas, carbon dioxide gas, argon gas or helium gas, which is highly safe.

The produced oil recovery tank is preferably divided into a recovery zone and a stripping zone by a partition wall having a communicating portion at the lower end. As a result, the operation of expelling the low boiling point component contained in the produced oil by blowing the stripping gas into the produced oil is performed more effectively.

In the above apparatus, preferably, a low boiling point component condensing tank for condensing the low boiling point component in the low boiling point component-containing stripping gas discharged from the produced oil recovery tank to separate it from the stripping gas is provided. . As a result, the low boiling point component separated from the stripping gas in the condensing tank can be recovered and the oil can be used, for example, as a fuel for a thermal decomposition pot of waste plastic.

In the low boiling point component condensing tank, cooling means is provided for cooling the low boiling point component-containing stripping gas in order to condense the low boiling point component. Examples of the cooling means include a coil-shaped cooling pipe and a cooling jacket provided outside the low boiling point component condensing tank.

Further, preferably, a stripping gas return pipe for returning the stripping gas separated from the low boiling point component in the low boiling point component condensing tank to the produced oil recovery tank is provided. In this way, since a highly safe stripping gas composed of an inert gas can be circulated and used, the safety can be further enhanced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a preferred embodiment of the present invention will be described with reference to FIG.

In FIG. 1, the gaseous waste plastic pyrolyzate sent from the waste plastic pyrolyzer to the condenser (2) at about 270 ° C. to room temperature is condensed here and separated into produced oil and off-gas. Only the produced oil is sent to the produced oil recovery tank (3). This produced oil is
It consists of a wide variety of substances from low-boiling components to high-boiling components. The temperature of the produced oil in the recovery tank (3) is about 50-
It is 60 ° C.

A nitrogen gas injection port (4) is provided on the bottom wall of the produced oil recovery tank (3). Produced oil recovery tank
The inlet (6) (exhaust port) of the nitrogen gas exhaust pipe (5) containing a low boiling point component is inserted into the top wall of (3). In the produced oil recovery tank (3), a partition wall (7) having a communication part (8) at the lower end
Depending on the collection zone (9) and stripping zone (10)
It is divided into and.

Collection zone of this produced oil collection tank (3)
By blowing nitrogen gas from the nitrogen gas blowing port (4) into the produced oil introduced into the stripping zone (10) from the (9) through the communication part (8), low boiling point components in the oil Is expelled upward together with nitrogen gas, and nitrogen gas containing low boiling point components is discharged to the outside of the recovery tank (3) through the gas discharge pipe (5). As a result, the flash point of the produced oil remaining in the recovery tank (3) is increased.

The produced oil from which the low boiling point components have been removed is appropriately discharged through the produced oil discharge pipe (11).

The low boiling point component-containing nitrogen gas discharged from the produced oil recovery tank (3) is sent to the low boiling point component condensation tank (12) through the gas discharge pipe (5).

Outside the low boiling point component condensing tank (12), the same tank (1
A coil-shaped cooling pipe (13) for cooling the nitrogen gas containing a low boiling point component in 2) to about room temperature is installed.

The low boiling point component in the low boiling point component-containing nitrogen gas sent to the low boiling point component condensing tank (12) is condensed and separated from the nitrogen gas.

The condensed low boiling point component is collected at the bottom of the low boiling point component condensing tank (12) and appropriately discharged through the low boiling point component discharge pipe (14), and is used as, for example, a fuel for a waste plastic pyrolysis kettle. .

On the other hand, the nitrogen gas separated from the low boiling point component in the low boiling point component condensing tank (12) is sent to a nitrogen gas return pipe (15), and by a pump (16) provided in the middle of it,
It is again blown into the produced oil recovery tank (3) as stripping gas. Thus, in the above device, the nitrogen gas that is an inert gas is circulated and used in a closed system,
Excellent in safety.

[0021]

EFFECT OF THE INVENTION Since the apparatus for removing low boiling point components from waste plastic oil products according to the present invention has the above-mentioned constitution, it is possible to efficiently and safely remove low boiling point components from produced oil. This makes it possible to obtain a produced oil having a high flash point and excellent safety during transportation and storage.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a device for removing low boiling point components in a waste plastic oil product according to the present invention.

[Explanation of symbols]

(3)… Recovered oil recovery tank (4)… Nitrogen gas inlet (stripping gas inlet) (6)… Low boiling point component nitrogen gas exhaust pipe inlet (low boiling point component stripping gas (Discharge port) (7) ... Partition wall (8) ... Communication section (9) ... Recovery zone (10) ... Stripping zone (12) ... Low boiling point component condensing tank (13) ... Coiled cooling pipe (cooling means) (15) )… Nitrogen gas return pipe (stripping gas return pipe)

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nobuyuki Yoshida 5-3-3, Nishikujo 5-chome, Konohana-ku, Osaka City Hitate Shipbuilding Co., Ltd. (56) Reference JP 10-195452 (JP, A) Flat 9-20892 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) C10G 1/10 B09B 3/00 C08J 11/00-11/28

Claims (5)

(57) [Claims] 1. A recovery tank for the produced oil recovered by condensing a gaseous pyrolyzate of waste plastic communicates with the lower end.
A partition with a recovery zone and stripping zone
The stripping zone is provided with a stripping gas blowing port for expelling the low boiling point component in the produced oil and a discharge port for the low boiling point component-containing stripping gas. , Stripping zo
Of the stripping gas blowing port,
Device for removing low boiling point components in waste plastic oil products , which is connected to the opposite side . 2. The low boiling point component removing device according to claim 1, wherein the stripping gas is an inert gas. 3. A product oil recovery tank to condense the low boiling components of the low boiling point component containing stripping gas discharged from the separating and stripping gas low-boiling component condensing tank is provided, according to claim 1 or 2. The low boiling point component removing device according to 2. 4. The low boiling point component removing device according to claim 3 , further comprising cooling means for cooling the low boiling point component-containing stripping gas in the low boiling point component condensing tank. 5. The low boiling point component removing device according to claim 3 , further comprising a stripping gas return pipe for returning the stripping gas separated from the low boiling point component in the low boiling point component condensing tank to the produced oil recovery tank. .