JP2002059142A - Method of heating material to be treated and heating facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that the plastic is fused to the inside wall of a cylindrical body of a heating device and a transporting passage to affect adversely the heating effect at the time of heating the plastic or waste containing the plastic. SOLUTION: In the case of reducing the volume of a material to be treated in a carbonizing furnace 20, a material to be treated, which has an aluminum member, is mixed with the material to be treated. The aluminum member separated by heating acts as fusion preventing material and the residue after heating is introduced into an aluminum sorting means 34 to sort and recover the aluminum member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a facility for heat-treating various kinds of wastes (for example, wastes, various kinds of dried products and carbides), and more particularly to wastes containing a large amount of plastics. To heat treatment without fusing to a furnace wall or the like as heat treatment means.

[0002]

2. Description of the Related Art Various objects to be treated containing combustible components such as plastics (for example, wastes, various dried materials,
In the case of performing heat treatment on a carbide, etc., the object to be treated and the thermal decomposition product may be fused to the inner wall of a rotary kiln (cylindrical body), a transfer path, or the like that constitutes the heat treatment apparatus by heating.
In particular, there is a risk of fusing and further depositing on the inner wall of the rotary kiln.

[0003] These fused materials act as thermal insulators, causing a decrease in the heat transfer area of the rotary kiln, a decrease in the heat transfer effect, and the like, and adversely affect the heat treatment effect.

The following technique has been proposed as such a fusion prevention measure.

[0005] In order to prevent the fusion of the waste material on each of the heat transfer surfaces with a horizontal rotating drum provided with a plurality of heat transfer surfaces and indirectly heating the waste, stone, gravel or iron, A method for preventing fusion by supplying lumps such as alumina, silicon nitride, and zirconia (Japanese Patent Laid-Open No. 9-27)
3725).

A method of adding a compound of a divalent metal such as an oxide of copper, zinc and magnesium to a vinyl chloride resin waste as an anti-sticking agent (JP-A-11-222534 and JP-A-11-279327).

When heat-treating fly ash in a reactor, a large number of impact-imparting solid particles (spherical, metal, ceramic) are put into the reactor, and the solid particles are lifted, and fly ash adhering to the inner wall surface of the reactor when dropped (Japanese Patent Laid-Open No. 2000-93918).

A softening temperature of 300 ° C. or more and a maximum particle size of 1 m
m, a powder of an alkaline earth metal hydroxide or carbonate, carbon powder, fly ash, silica fine powder, alumina fine powder, blast furnace slab and converter slab powder, (JP-A-10-131
1677).

[0009]

According to each of the above-mentioned conventional methods, a member (agent) for preventing fusion and sticking, which is different from the object to be processed which is normally processed, is used. Incur costs.

[0010] Moreover, these members remain in the residue after the treatment, and new costs are incurred for recovery. If the members are buried as they are, the amount of burying will increase. However, there is a new problem.

The present invention has been made to solve such a problem.

[0012]

Means for Solving the Problems The inventors of the present application have repeated research on heat treatment of various kinds of wastes, and particularly, when heating plastics (plastics, objects to be treated including plastics), the heat treatment of While studying the technology to prevent substances and thermal decomposition products from adhering to the inner walls of the heat treatment means (the inner wall of the heat treatment furnace and the inner wall of the transfer path), the following phenomena were found.

(1) In the case of carbonization treatment by dry distillation at a temperature of 500 ° C. to less than 600 ° C., an aluminum foil mixed with an object to be processed is adhered or an aluminum layer or other aluminum member is provided. The product must be able to recover aluminum members as they are.

(2) The object to be processed and the pyrolysis products are less likely to adhere to the cylindrical body or the inner wall surface of the transfer path due to the aluminum member separated by the heat treatment.

(3) In addition, the same effect can be obtained by recovering only the aluminum member from the recovered residue and adding the additional component when the aluminum member component is small as the material of the object to be treated.

The present invention has been made based on these findings, and a specific means is a processing method for reducing the volume of an object to be processed by heating the object to be processed by a heat processing means using indirect heating. Further, as means for preventing the object to be processed or the thermal decomposition product from fusing in the heat treatment means, the object to be processed having an aluminum member is mixed and subjected to heat treatment.

Further, an aluminum member is recovered from the residue obtained by the heat treatment according to the above-mentioned processing method, and the recovered aluminum member is mixed with the object to be subjected to the heat treatment as a means for preventing fusion, followed by heat treatment.

The object to be processed is suitable for heat-treating easily meltable plastics and objects containing plastics.

Further, as the object to be treated having an aluminum member to be mixed with the object to be treated, a composite of an aluminum layer and another member or an object to be treated mainly composed of an aluminum layer is preferable.

The heating temperature at which the object is heated is desirably a temperature at which the object is carbonized and is equal to or lower than the melting temperature of the aluminum member.

The heat treatment facility includes a heat treatment means for heat-treating the object by indirect heating to reduce the volume of the object, and introducing a decomposed gas generated by the heat treatment means to the decomposed gas. A heat treatment facility comprising a combustible component removing means for removing combustible components contained therein, and a means for purifying and discharging the gas after removing the combustible components, wherein the heat treatment means heat-treats and reduces the volume. An aluminum recovery means for recovering an aluminum member from the processed workpiece is provided, and the aluminum recovery means separates the aluminum member mixed with the workpiece or the workpiece having the aluminum member as a fusion preventing means by heat treatment. It is configured to collect the removed aluminum member.

[0022]

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

FIG. 1 is a conceptual view of a heat treatment facility for an object to be treated to which the present invention is applied. This treatment facility uses two heat treatment furnaces as heat treatment means having the same configuration, and performs a first heat treatment. This is a case where the furnace 10 is provided with a transport and drying function, and the second heat treatment furnace 20 is provided with a carbonizing function.

The first heat treatment furnace 10 has a rotatable cylindrical body 11 having a blade 11a (see FIG. 2) for moving an object to be processed while being stirred, and a gas duct on the outer periphery of the cylindrical body 11. A heating cylinder 12 that is formed and heats the cylindrical body 11 by introducing a hot gas; a supply port 13 provided at one end of the cylindrical body 11 to supply an object to be processed into the cylindrical body 11;
A discharge port 14 is provided at the other end of the cylindrical body 11, and the cylindrical body 11 is rotationally driven by a rotation driving unit 15. The rotation driving means 15 is a driving motor 15
a, a driving gear 15b, and a driven gear 15c provided on the cylindrical body 11.

16 is a supply duct surrounding the supply port 13 side, 17 is a discharge duct surrounding the discharge port 14 side, 18
Is a dynamic seal (mechanical seal) for sealing ducts 16 and 17 (not shown) in contact with the outer periphery of the cylindrical body 10 and a contact portion with the heating cylinder 12.

Reference numeral 19 denotes a support roller for rotatably supporting the cylindrical body 11 at both ends.

The basic structure of the second heat treatment furnace 20 is the same as that of the first heat treatment furnace 10 described above. Therefore, in the same or equivalent part, one digit of 20 is set to the same number (for example, 21 is a cylindrical body, 22 is a heating cylinder, and 29 is a supporting roller).
Description is omitted.

Numeral 30 denotes a hopper, into which a material to be treated containing plastics or plastics and a material to be treated having an aluminum member such as an aluminum foil or an aluminum layer (attached or layered) are charged. 11 to the cylindrical body 11
Supply within.

The cylindrical body 11 of the first heat treatment furnace 10 and the cylindrical body 21 of the second heat treatment furnace 20 are disposed vertically, and the discharge duct 17 and the supply duct 26 of the cylinder 11 are arranged vertically.
Is communicated via a rotary valve 32, and
Discharge side duct 27 of cylindrical body 21 of second heat treatment furnace 20
Discharges the carbide and the aluminum member after the heat treatment to an aluminum sorting means 34 through a rotary valve 33, where aluminum and a residue are sorted.
In a, the residue is collected by the residue collecting means 34b.

Numeral 35 denotes a gas-fired furnace as a heating source, LN
A fuel such as G or LPG is burned to generate hot gas.
This hot gas is supplied into a heating cylinder 22 provided on the outer periphery of the cylindrical body 21 and heats the cylindrical body 21, and then is sent into the heating cylinder 12 of the cylindrical body 11 through the communication pipe 37, and Is heated and then discharged from the discharge pipe 38. It is desirable to reuse the discharged hot gas as a heat exchanger, a drying means, or a heat source for hot water supply without directly discharging the hot gas.

A series of heat treatments in the first heat treatment furnace 10 and the second heat treatment furnace 20 are performed in a low oxygen atmosphere. In particular, the carbonization treatment in the second heat treatment furnace 20 is steaming and thermal decomposition by indirect heating in a low oxygen region.

Reference numeral 41 denotes a gas combustion furnace, which is a first heat treatment furnace 1
Exhaust gas generated during the heat treatment in the 0th and second heat treatment furnaces 20 is introduced through the exhaust gas pipes e ₁ and e ₂ , and is subjected to the combustion treatment.

After burning and removing combustible components such as harmful substances and tar components contained in the gas in the gas combustion furnace 41,
The bag filter 42 is cooled to a suitable temperature for use in the heat exchanger 40 and sent to the bag filter 42, where it is cleaned and discharged from the chimney 43. It is preferable to use a heat exchanger for cooling while utilizing waste heat.

Reference numeral B denotes an exhaust blower which sucks exhaust gas from the discharge duct 17 through the gas combustion furnace 41, the heat exchanger 40, and the bag filter 42, and discharges the exhaust gas from the chimney 43.

The gas combustion furnaces 35 and 41 may be shared. In this case, the exhaust gas pipes e ₁ and e ₂ are connected to the gas combustion furnace 3.
5, the gas combustion furnace 41 side may be omitted, and the discharge pipe 38 may be connected to the heat exchanger 40.

Next, a series of processing methods for an object to be processed will be described.

First, the second heat treatment furnace 20 (hereinafter, referred to as a carbonization furnace) and the first heat treatment furnace 10 (hereinafter, referred to as a transfer / drying furnace) in a state where the object to be processed is not charged (the state may be charged). ) Is started.

That is, fuel such as LNG is burned in the gas combustion furnace 35 and the gas combustion furnace 41, and each furnace is heated.

The hot gas generated in the gas combustion furnace 35 is supplied to the heating cylinder 22 of the carbonization furnace 20, heats the cylindrical body 21, and is sent from the communication pipe 37 into the heating cylinder 12 of the transport / drying furnace 10. Then, the cylindrical body 11 is heated.

At this time, the heating temperature of the carbonizing furnace 20 is set to a temperature (200 ° C. to 600 ° C.) at which the workpiece is carbonized.

When each furnace reaches this temperature, the hopper 30 crushes the processing object made of a multi-colored substance mixed with the processing object having the aluminum member (about 20 mm in size), and transports and dries it. Supply within 10. The supplied processing object is dried by evaporating water while being conveyed to the discharge port 14 side. The dried object is sent to the carbonization furnace 20 via the discharge side duct 17, the rotary valve 32, and the supply side duct 26, where the volume reduction (carbonization) by dry distillation is performed at 200 ° C to 600 ° C. At this time, since the aluminum member of the processing object having the aluminum member mixed with the processing object does not melt at 600 ° C., it remains as it is, and the members other than the aluminum member are eliminated or carbonized and separated from the aluminum member. .

The separated aluminum member acts as a fusion preventing material, and is discharged together with the object to be processed to the external aluminum recovery means 34 via the discharge duct 27 and the rotary valve 33.

The discharged residue (carbide) and the aluminum member are introduced into an aluminum sorting means 34 to sort and collect the aluminum member. The recovered aluminum member can be reused as a resource, and a part of the aluminum member can be mixed with the object to be processed and used as an anti-fusion material.

The temperature of the carbonization furnace 20 is controlled by the gas combustion furnace 35.
Control of the amount of fuel supplied by the transfer / drying furnace 1
The temperature control of 0 can be performed by adjusting the supply amount of the temperature control air 36 to the communication pipe 37.

On the other hand, the transfer / drying furnace 10 and the carbonizing furnace 20
The steam and exhaust gas generated in the above are discharged to gas exhaust pipes e ₁ and e ₂
Is introduced into the gas combustion furnace 41 and burned. The combustion in the gas combustion furnace 41 is performed at 850 ° C. so as not to generate dioxins.
C. to 900 C. are desirable.

After combustible components such as tar and harmful substances are removed by burning in the gas combustion furnace 41, the gas is cooled to an appropriate temperature for use in the bag filter 42 in the exhaust gas cooling section 40, and the chimney is passed through the bag filter 42. It is discharged from 43.

In the above embodiment, the heating gas is used as the heating means for the indirect heating. However, the heating means is not limited to the heating gas but may be electric heating (resistance heating, induction heating, microwave heating, etc.). In this case, the gas combustion furnace 35 and the heating cylinders 12 and 22 as heating sources are not required.

[0048]

According to the present invention, as a means for preventing the object to be processed and the thermal decomposition products from fusing to the inner wall of the heating device as described above, the aluminum member contained in the object to be processed is effectively utilized. As a result, there is no need to mix special members, and no new cost rises.

The recovered aluminum member can be reused as a resource, and a part thereof can also be used as a fusion preventing material.

Since the fusion can be effectively suppressed, the heat transfer area of the cylindrical body is reduced, the heat transfer effect is reduced, and the adverse effect on the heat treatment effect is improved.

And the like.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an object heat treatment facility for explaining a heat treatment method of the present invention.

FIG. 2 is a sectional view of a rotating cylinder.

[Explanation of symbols]

 10, 20 ... heat treatment furnace 11, 21 ... cylindrical body 12, 22 ... heating cylinder 13, 23 ... supply port 14, 24 ... discharge port 15, 25 ... rotation drive means 16, 26 ... supply side duct 17, 27 ... discharge Side duct 18 Dynamic seal 19, 29 Support roller 30 Hopper 31, 32, 33 Rotary valve 34 Aluminum sorting means 35 Gas combustion furnace 36 Temperature-adjusted air 37 Connection pipe 38 Discharge pipe 40 Heat Exchanger 41 ... Gas combustion furnace 42 ... Bag filter 43 ... Chimney

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F27D 3/12 B09B 3/00 ZAB F-term (Reference) 4D004 AA07 AA46 AB03 BA03 BA05 CA12 CA26 CA27 CB09 CB34 CC11 DA02 DA06 4F301 AA11 AA21 AB02 CA04 CA05 CA09 CA25 CA26 CA42 CA52 CA64 CA68 CA72 4K055 AA05 HA01 HA21 HA25 4K061 AA01 AA08 BA00 EA07 EA10

Claims (7)

[Claims] Claims: 1. A processing method for reducing the volume of an object to be processed by subjecting the object to heat treatment by a heat treatment means by indirect heating, wherein the object to be treated or a thermal decomposition product is contained in the heat treatment means. A method for heat-treating an object to be processed, which comprises mixing and heat-treating an object having an aluminum member as a means for preventing fusion. 2. A processing method for reducing the volume of an object to be processed by subjecting the object to be heated by a heat treatment means by indirect heating, wherein the object to be treated or a thermal decomposition product is contained in the heat treatment means. As a means for preventing fusion, an object to be treated having an aluminum member is mixed and heat-treated, an aluminum member is collected from the obtained residue, and the collected aluminum member is mixed with the object to be heat-treated. And subjecting the object to heat treatment. 3. The heat treatment method for an object to be processed according to claim 1, wherein the object to be processed is plastics or waste containing plastics. 4. The method according to claim 1, wherein the object having the aluminum member is a composite of an aluminum layer and another member. 5. The method according to claim 1, wherein the object having the aluminum member is an object mainly composed of an aluminum layer. 6. The processing object according to claim 1, wherein a heating temperature at which the processing object is heat-treated is a temperature at which the processing object is carbonized and is equal to or lower than a melting temperature of the aluminum member. Heat treatment method. 7. A heat treatment means for heat-treating an object to be treated by indirect heating to reduce the volume of the object to be treated, and introducing a decomposed gas generated by the heat treatment means to thereby contain a flammable gas contained in the decomposed gas. A heat treatment facility comprising: a combustible component removing means for removing components; and a means for purifying and discharging gas after removing the combustible component, wherein the heat treatment is performed by the heat treatment means to reduce the volume of the treatment target. An aluminum recovery means for recovering the aluminum member from the object is provided, and the aluminum recovery means separates the aluminum member mixed with the object to be processed or the aluminum member having the aluminum member separated by heat treatment as a fusion preventing means. A heat treatment facility for an object to be treated, wherein the object is to be recovered.