JP2004183104A - Method and device for treating synthetic resins - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for treating synthetic resins in which waste synthetic resins such as plastics are mass-treated as fuel of a furnace and reducing agent of iron resources without causing any problems by chlorine-containing polymer resin contained in the waste synthetic resins. <P>SOLUTION: In the method for treating synthetic resins in a shape suitable for feeding in a furnace, and feeding them in the furnace as fuel and/or reducing agent of iron resources, a step of treating synthetic resins basically has a step of heating synthetic resins and performing dechlorination. The method preferably comprises a step of pulverizing synthetic resins, a step of heating the synthetic resins after the previous step and performing dechlorination, a step of pulverizing the synthetic resins after the previous step into granules while or after cooling the synthetic resins after the previous step, a step of sifting the granular synthetic resin after the pulverization to the grain size suitable for air feed, and a step of air-feeding the granular synthetic resin of small grain size sifted in the sifting step for fuel and/or reducing agent of iron sources, and blowing the resin into the furnace. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a method for treating synthetic resins when plastics or other synthetic resins are used as a reducing agent for a fuel or an iron source in a furnace, and a facility provided for performing the method.

  2. Description of the Related Art In recent years, synthetic resins such as plastics have been rapidly increasing as industrial wastes and general wastes, and their disposal has become a major social problem. Among them, plastics, which are high-molecular hydrocarbon compounds, generate a large amount of heat when they are burned, and when incinerated in a general incinerator, damage the furnace walls, etc., making mass processing difficult, and most of them are landfills. It is currently dumped on land. However, dumping of plastics or the like is not preferable in terms of environmental measures, and shortage of land for landfill is becoming a social problem in recent years. Therefore, development of a method for mass processing of synthetic resins without dumping is desired.

Against this background, Patent Literature 1 and Patent Literature 2 disclose a method of using synthetic resins such as plastics as an auxiliary fuel for a blast furnace or the like or a reducing agent for an iron source. In these methods, a synthetic resin pulverized material is blown into a blast furnace from a tuyere or the like. For example, in the former, as a substantial condition of the synthetic resin pulverized material blown into the furnace, a particle diameter of 1 to 10 mm and a bulk The condition that the density is 0.35 or more is shown.
Japanese Patent Publication No. Hei 8-507015 JP-B-51-33493

  However, it is said that synthetic resin as waste contains about 15% of chlorine-containing polymer resin such as vinyl chloride resin on average, and such synthetic resin was supplied to a blast furnace or the like. In such a case, a large amount of harmful gas (HCl) is generated due to the thermal decomposition and combustion of the chlorine-containing polymer resin, causing significant environmental pollution. In addition, since this harmful gas is also a strongly corrosive gas, it causes corrosion of piping and the like. Therefore, in order to prevent the generation of such a harmful gas, it is necessary to separate and remove only the chlorine-containing polymer resin from the synthetic resins in advance and efficiently treat the chlorine-containing polymer resin.

Synthetic resins that are discarded as industrial waste or general waste vary in type, form, and shape, and are thermoplastic resins such as polyethylene and vinyl chloride; thermosetting resins such as phenolic resins; and engineering plastics. And hundreds of other types, and these exist in the form of blocks, such as plates, films, or composites. Also, the shapes are various from granular to long or large diameter.
Generally, as a method of separating and removing only chlorine-containing polymer resin from waste synthetic resins in advance, a wet separation method using a specific gravity difference or a centrifugal separation method can be considered. Since various types of resin materials are included in terms of type, form, and shape, these separation methods have the following problems.

(a) In order to prevent the synthetic resin from hanging on the shelves when charged into the separation device, it is necessary to make the sizes of the resin materials uniform.For this purpose, prior crushing treatment, that is, various forms and shapes are required. Crushing is required to make the resin material having a uniform size.
(b) In the wet separation method using the specific gravity difference, when the specific gravity of the chlorine-containing polymer resin material and the other resin material are approximately the same, the chlorine-containing polymer resin material is separated and removed from the other resin material. I can't.
(c) Separation efficiency is low depending on the type of waste synthetic resin to be treated. Examples of such synthetic resins include food packaging wrap films.
(d) In a composite material in which a chlorine-containing polymer resin and another resin are bonded in a sheet shape, only the chlorine-containing polymer resin cannot be separated.
(e) In a wet type separation device or a centrifugal separation device utilizing a difference in specific gravity, a separation solution is used in the device. However, it is necessary to treat a used contaminated separation solution, which causes an increase in treatment cost.
(f) It is necessary to separately treat the chlorine-containing polymer resins separated and removed.

  As described above, there are various problems in separating and removing only chlorine-containing polymer resin materials from waste synthetic resins in advance by using a wet separation method using a specific gravity difference, a centrifugal separation method, or the like. Then, practical application is difficult. Therefore, how to easily and economically treat the chlorine-containing polymer resin contained in the waste synthetic resins is an important factor in determining the success or failure of large-scale treatment by converting the synthetic resins into a fuel or the like.

Accordingly, an object of the present invention is to solve such problems of the prior art, and to reduce synthetic fuels such as plastics as waste without causing problems due to the chlorine-containing polymer resin contained therein, without causing the problem of furnace fuel or iron source. It is an object of the present invention to provide a method for treating synthetic resins which can be treated in large quantities as a reducing agent.
Another object of the present invention is to provide a method for treating synthetic resins that can effectively improve the transportability and fluidity of synthetic resins supplied to a furnace.
Still another object of the present invention is to provide equipment suitable for treating such synthetic resins.

In order to solve such a problem, a processing method and equipment of the present invention have the following configurations.
(1) A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying the same to the furnace as a reducing agent for a fuel and / or iron source,
A synthetic resin processing method, wherein the synthetic resin processing step includes a step of heating and dechlorinating the synthetic resin.
(2) A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying the same to the furnace as a reducing agent for a fuel and / or iron source,
A step of heating and dechlorinating the synthetic resin, a step of pulverizing the synthetic resin after the step while cooling or after cooling, and a step of subjecting the granular synthetic resin material after the pulverization to fuel and / or Supplying a furnace as a reducing agent for an iron source to a furnace.

(3) A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying the same to the furnace as a reducing agent for a fuel and / or iron source,
A step of crushing the synthetic resin, a step of heating and dechlorinating the synthetic resin after the step, and a step of pulverizing the synthetic resin after the step while cooling or after cooling, Supplying the granular synthetic resin material after the pulverization treatment to a furnace as a reducing agent for a fuel and / or iron source.

(4) A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying it to the furnace as a reducing agent for a fuel and / or iron source,
A step of crushing the synthetic resin, a step of heating and dechlorinating the synthetic resin after the step, and a step of pulverizing the synthetic resin after the step while cooling or after cooling, A step of sieving the granular synthetic resin material after the pulverizing treatment to a particle size suitable for pneumatic supply, and reducing the granular synthetic resin material having a small particle diameter sieved in the sieving step to a fuel and / or iron source Pneumatically supplying the mixture as a chemical to a furnace and blowing it into the furnace.

(5) The method according to any one of (1) to (4), wherein the synthetic resin is heated to 250 to 350 ° C. in the step of heating and dechlorinating the synthetic resin. Resin treatment method.
(6) In the processing method according to any one of the above (1) to (5), the granular synthetic resin material supplied to the furnace through the pulverization processing step has a bulk density of 0.30 or more and a repose angle of 40 ° or less. A method for treating synthetic resins.

(7) equipment for processing synthetic resin into a shape suitable for supply into the furnace, and then supplying it to the furnace as a reducing agent for fuel and / or iron source,
A chlorine removing device for heating and dechlorinating the synthetic resin, a crushing device for crushing the synthetic resin subjected to the treatment by the device while cooling or after cooling, and a crushing process by the device Supply means for supplying the granular synthetic resin material afterward to a furnace as a reducing agent for a fuel and / or iron source.

(8) equipment for processing synthetic resin into a shape suitable for supply into the furnace, and then supplying it to the furnace as a reducing agent for fuel and / or iron source,
A primary or multiple primary crushing device for crushing synthetic resins, a chlorine removing device for heating and dechlorinating the synthetic resins crushed by the device, and a treatment by the device. A pulverizing device for pulverizing the synthetic resin while cooling or after cooling, and a sieving device for sieving the granular synthetic resin material after the pulverizing process by the device to a particle size suitable for pneumatic supply; Supply means for pneumatically supplying the granular synthetic resin material having a small particle diameter sieved by the apparatus to a furnace as a reducing agent for a fuel and / or an iron source, and blowing the mixture into the furnace. Processing equipment.

 (9) In the processing equipment of the above (7) or (8), the supply means is a primary storage silo for receiving the granular synthetic resin material transferred from the pulverizing device or the sieving device, and the granular material supplied from the primary storage silo. A blowing station for pneumatically feeding the synthetic resin material to the furnace, the blowing station comprising at least a secondary storage silo charged with the granular synthetic resin material supplied from the primary storage silo; A blowing tank for receiving the granular synthetic resin material supplied from the secondary storage silo side and pneumatically feeding the same to the furnace, and capable of continuously supplying the granular synthetic resin material from the blowing tank to a blowing portion of the furnace. Processing equipment for synthetic resins, characterized by having a configuration as described above.

  The proportion of the chlorine-containing polymer resin material in the synthetic resin supplied to the processing step may vary to some extent with time due to the nature of waste, and may be relatively short (for example, several hours to several hours). When the processing time is limited to several tens of hours, only the synthetic resin containing no chlorine-containing polymer resin material in the processing step may be supplied. In such a case, even though the synthetic resins are heated in the dechlorination treatment step, the substantial dechlorination treatment is not temporarily performed, but the treatment method of the present invention includes such a case. Needless to say,

According to the present invention, synthetic resins such as plastics as wastes can be produced without concern about the problem of generation of harmful gas due to combustion of chlorine-containing polymer resin, and with separation and removal of chlorine-containing polymer resin material. It can be used as a furnace fuel or iron source reducing agent without causing any problems, and has the effect of enabling large-scale treatment and effective utilization of waste synthetic resins.
Further, according to the processing method of the invention according to claim 6, the fluidity and transportability of the synthetic resin supplied to the furnace can be effectively improved, and the operation of the furnace in a furnace such as a blast furnace or a scrap melting furnace. The synthetic resin material can be appropriately supplied as a fuel or an iron source reducing agent into the furnace without any trouble.

FIG. 1 is a conceptual diagram showing one configuration example of a synthetic resin processing method and equipment according to the present invention, and 1 is a synthetic resin processing equipment.
Synthetic resins supplied as a fuel or iron source reducing agent to the furnace are received by the processing equipment 1 and processed into a shape suitable for supply in the furnace. Is subjected to a dechlorination treatment of desorbing hydrogen chloride (gas) from the chlorine-containing polymer resin contained in the synthetic resins. In FIG. 1, reference numeral 2 denotes a chlorine removing apparatus in which the dechlorination step is performed.

In general, when a chlorine-containing polymer resin such as vinyl chloride is heated, desorption of chlorine (hydrogen chloride) from the resin starts at about 250 ° C., ends at about 350 ° C., and is further heated to a higher temperature. Thermal decomposition of hydrocarbons begins. Therefore, the above-mentioned dechlorination treatment is performed by heating the synthetic resins to a temperature of about 250 to 350 ° C, preferably about 300 to 350 ° C.
There is no particular limitation on the type of the chlorine removing device 2, and for example, various devices such as a screw extrusion method using external heating, a pyrolysis furnace method, a fluidized bed method, and a rotary kiln method can be used.

  FIG. 2 shows an example of the configuration of a pyrolysis furnace type chlorine removing apparatus 2, in which 6 is a pyrolysis furnace main body, 7 is a screw feeder for supplying synthetic resins to the pyrolysis furnace, and 8 is a resin in the furnace. Stirring blades for stirring the components, 9 is an extraction port for extracting the resin material after the dechlorination treatment to the outside of the furnace, 9a is a shut-off valve thereof, and 10 is discharge the desorbed hydrogen chloride (HCl) to the outside of the furnace. Outlet for The screw feeder 7 is driven by a motor 18.

  In the chlorine removing apparatus 2 shown in FIG. 2, synthetic resins are supplied into the furnace through a resin supply port 11 and a screw feeder 7, and the synthetic resins are stirred by a stirring blade 8 rotated by a motor 250. It is heated to about 350 ° C. By this thermal decomposition by heating, the chlorine content in the chlorine-containing polymer resin contained in the synthetic resins is desorbed in the form of hydrogen chloride gas, and this hydrogen chloride gas is discharged out of the furnace through the outlet 10. On the other hand, the resins (including the carbonaceous residue of the resin material from which chlorine has been desorbed) from which the dechlorination treatment has been completed are drawn out of the furnace through the outlet 9. The heating in the furnace may be any of an external heating method such as gas heating or electric heating, a gas heating method of supplying gas directly into the furnace, and the like.

  FIG. 3 shows an example of the configuration of a screw extruder-type chlorine removing apparatus 2, in which 13 is a horizontal screw feeder, 14 is a supply port for supplying synthetic resin to one end of the screw feeder, Reference numeral 15 denotes an outlet for extracting the treated resin material discharged from the other end of the screw feeder, 16 denotes an outlet for hydrogen chloride gas, and 17 denotes a heating device surrounding the screw feeder 13. The screw feeder 13 is driven by a motor 19.

  In the chlorine removing apparatus 2 shown in FIG. 3, the synthetic resin supplied from the supply port 14 to one end of the screw feeder 13 is heated to about 250 to 350 ° C. by the heating device 17 while being transferred by the screw feeder 13. The chlorine contained in the chlorine-containing polymer resin contained in the synthetic resin is desorbed in the form of hydrogen chloride gas by the thermal decomposition of the resin by heating, and the hydrogen chloride gas is discharged from the outlet 16. Further, the dechlorination treatment is completed by the heating during the transfer, and the resins (including the carbonaceous residue of the resin material from which chlorine has been removed) discharged from the other end of the screw feeder 13 are drawn out from the discharge port 15. It is.

  FIG. 4 shows an example of the structure of a chlorine removing device 2 of the twin screw extrusion type, in which reference numeral 20 denotes a horizontal twin screw feeder, and reference numerals 21a and 21b supply synthetic resins to one end of the screw feeder. In this configuration example, a supply screw feeder 22 is attached to one of the supply ports 21a. Reference numeral 23 denotes an outlet for extracting the treated resin material discharged from the other end of the screw feeder 20, and reference numeral 24 denotes a heating medium for heating the resin in the screw feeder 20 (usually, a dechlorinated resin is used in the apparatus. A heat medium supply port 25 for supplying liquefied synthetic resin as a heat medium) is an outlet for hydrogen chloride gas. The screw feeder 20 is driven by a motor 26, and the supply screw feeder 22 is driven by a motor 27.

  In the chlorine removing apparatus 2, the synthetic resin supplied to one end of the screw feeder 20 from one or both of the supply port 21a (and the screw feeder 22) and the supply port 21b is transferred by the screw feeder 20, The heating medium is heated to about 250 to 350 ° C. by the heating medium supplied from the heating medium supply port 24 into the screw feeder 20, and by the thermal decomposition of the resin by this heating, the chlorine content in the chlorine-containing polymer resin contained in the synthetic resin is reduced It is desorbed in the form of hydrogen chloride gas, and this hydrogen chloride gas is discharged from the outlet 25. In addition, the dechlorination treatment is completed by the heating during the transfer, and the resins (including the carbonaceous residue of the resin material from which the chlorine content has been removed) discharged from the other end of the screw feeder 20 are extracted from the extraction port 23. Will be issued.

FIGS. 5 and 6 show an example of the construction of a rotary kiln-type chlorine removing apparatus 2. Reference numeral 37 denotes a rotary kiln main body. The rotary kiln main body 37 comprises a refractory material 38 and an iron shell 39, and the inside thereof is made of synthetic resin. And a passage 40 for dechlorination while transferring.
The synthetic resin and the heat medium are supplied to the passage 40 of the rotary kiln body 37 from one end thereof, and a heating gas is supplied as a heat source. This heating gas heats the entire kiln and also heats the synthetic resin and the heat medium. The synthetic resin is heated while being mixed with the heat medium by the rotation of the kiln, and this heating causes a reaction in which chlorine in the chlorine-containing polymer resin material contained in the synthetic resin is desorbed as hydrogen chloride, and hydrogen chloride gas is generated. Occurs.
The heated gas flowing through the passage 40 and the hydrogen chloride gas desorbed from the chlorine-containing polymer resin material are discharged from the other end of the passage 40, and the hydrogen chloride gas in the discharged gas is recovered by a hydrogen chloride absorption tower or the like. . Further, the synthetic resins (including the carbonaceous residue of the resin material from which chlorine content has been desorbed) after the dechlorination treatment are discharged out of the kiln together with the heat medium.

In the dechlorination treatment using such a rotary kiln, as a heat medium to be supplied into the passage 40 together with the synthetic resin, one or more kinds of powdery materials that can be used as an iron source reducing agent for a furnace, a fuel, or an auxiliary material are used. Is preferred. As a result, the synthetic resin after the dechlorination treatment can be used as it is as the iron source reducing agent or the fuel of the furnace without being separated from the heat medium. Examples of the powder or granules suitable for such a heat medium include coke breeze, fine ore, and sintered powder, and it is preferable to use one or more of these as a heat medium.
Further, in order to prevent segregation of the heat medium in the passage 40 and improve the heating efficiency, it is preferable that the particle diameter and specific gravity of the heat medium be as close to the resin material as possible. Most preferably, coke breeze is used.

FIG. 7 shows a more specific configuration example of the chlorine removing device 2 using a rotary kiln system. A screw feeder 41 for supplying a material having a supply port 42 and a screw feeder 41 having a supply port 42 are provided at one end of a rotary kiln body 37 having a passage 40. A hot air conduit 43 for supplying gas (hot air) is connected. The other end of the rotary kiln body 37 is provided with a treated resin material and exhaust gas discharge device 44. The discharge device 44 has a resin material discharge port 45 at a lower portion thereof and an exhaust gas discharge port 46 at an upper portion thereof. In the other drawings, 47 is a hot air generator, and 48 is a drive motor of the screw feeder 41.

In such a chlorine removing device 2, synthetic resin and a heat medium are supplied into the passage 40 from one end side of the rotary kiln body 37 through the screw feeder 41, and a heating gas is supplied from the hot air conduit 43.
In the passage 40, the synthetic resin is dechlorinated as described above, and the exhaust gas (heating gas + hydrogen chloride gas) and the synthetic resin that has been dechlorinated (the carbonaceous material of the resin material from which chlorine has been desorbed) are used. Is discharged to the discharge device 44 at the other end of the rotary kiln body 37, the exhaust gas is discharged from the upper exhaust gas discharge port 46, and the mixture of the synthetic resin and the heat medium is discharged to the lower portion. Is discharged from each of the discharge ports 45.
The supply of the synthetic resin and the heat medium to the rotary kiln body 37 may be performed using separate supply devices.

FIGS. 8 and 9, 10, 11, and 12 show other examples of the configuration of the rotary kiln-type chlorine removing apparatus 2. The rotary kiln body includes an outer tube and an inner tube disposed therein. And has a common feature that the inside of the inner tube is used as a passage for the resin material to be treated and the space between the inner tube and the outer tube is used as a passage for the heating gas. The hydrogen chloride gas thus obtained can be taken out without being mixed with the heating gas, so that the equipment cost and the processing cost required for the treatment of the exhaust gas can be greatly reduced as compared with the apparatus shown in FIG. In addition, since the entire inner tube in which hydrogen chloride gas is generated is heated by the heating gas, the temperature of the entire inner tube is maintained at a higher temperature range than a temperature range of 150 ° C. or less, at which hydrogen chloride exhibits strong corrosiveness. Therefore, it is possible to appropriately prevent corrosion of the apparatus, particularly each part of the inner pipe, by the generated hydrogen chloride gas.

First, in the chlorine removing apparatus 2 shown in FIGS. 8 and 9, 49 is a rotary kiln main body, 50 is an outer tube constituting the same, 51 is an inner tube, and the inner tube 51 is an inner longitudinal direction of the outer tube 50. Are arranged substantially concentrically with the outer tube 50. The inside of the inner tube 51 constitutes a passage 52 (processing space) of synthetic resin, and the space between the outer tube 50 and the inner tube 51 constitutes a passage 53 of the heating gas.
FIGS. 10 and 11 show another configuration example in which the configuration of the inner tube and the like is different. In FIGS. 8 and 9, a single inner tube is arranged in the outer tube. A plurality of inner tubes 51a to 51c are provided in 50. In addition, the number of the inner tubes 51 arranged in the outer tube 50 is arbitrary.

  In such a structure, since a plurality of inner tubes are provided, the heat transfer area increases accordingly. Therefore, there is an advantage that heat can be efficiently transferred from the heating gas flowing through the passage 53 into the inner tubes. Since the mixing ratio and type of the resin material to be heated and the heating medium can be changed for each inner tube, for example, for a resin material having a large particle size and inferior processing efficiency, the mixing ratio of the heating medium is increased. For a resin material having a small processing efficiency and a high processing efficiency, it is also possible to reduce the mixing ratio of the heat medium, and then supply each to a separate inner tube for processing.

FIG. 12 shows another configuration example, in which a gas conduit 54 is arranged inside the inner pipe 51 so that the heating efficiency of the resin material to be processed can be further increased. Note that such a gas conduit can also be arranged in the inner pipes 51a to 51c of the apparatus shown in FIGS.
In the above-described rotary kiln-type chlorine removing apparatus 2 shown in FIGS. 8 to 12, as long as the inner pipes 51, 51a to 51c are substantially rotated in the circumferential direction, the dechlorination of synthetic resins is not hindered at all. It can be carried out. Therefore, in each of the above devices, the entire rotary kiln body 49 including the outer tube 50 may be configured to be rotatable in the circumferential direction, but only the inner tubes 51, 51a to 51c are configured to be rotatable in the circumferential direction. May be. In the case of the apparatus shown in FIGS. 10 and 11, the inner pipes 51a to 51c are integrally rotated (in this case, the individual inner pipes are eccentrically rotated as in the case of rotating the rotary kiln 49). Alternatively, the inner tubes 51a to 51c may be individually rotated.

In the chlorine removing apparatus 2 shown in FIGS. 8 to 12, the synthetic resin, the heat medium (granules), and the heating gas are supplied from one end of the rotary kiln body 49 to the passages 52 and 53 through a supply mechanism (not shown). .
The heating gas supplied to the passage 53 heats the entire inner tube 51, 51a to 51c, and the synthetic resin and the heat medium are heated through the tube wall. The heated gas flowing through the passage 53 is discharged from the other end of the rotary kiln body 49.

On the other hand, the synthetic resins supplied to the passage 52 inside the inner tubes 51, 51a to 51c are mixed with the heat medium by the rotation of the inner tubes 51, 51a to 51c, and heated while being transferred through the passage 52. As a result, the chlorine content in the chlorine-containing polymer resin material contained in the synthetic resins is desorbed as hydrogen chloride, and hydrogen chloride gas is generated. The synthetic resin (including the carbonaceous residue of the resin material from which chlorine has been desorbed) which has been thus dechlorinated is discharged from the other end of the rotary kiln body 49 together with the heating medium, and at the same time, hydrogen chloride gas is also discharged. Is discharged. Therefore, the hydrogen chloride gas generated by heating the chlorine-containing polymer resin material is recovered without mixing with the heated gas.
In order to smoothly move the resin material and the heat medium in the passage 52, a small amount of carrier gas (such as air) can be passed through the passage 52.

In the above apparatus, the heating gas flows outside the inner pipes 51, 51a to 51c in which hydrogen chloride is generated. Therefore, the temperature of the entire inner pipe is about 250 to 350 ° C., so that hydrogen chloride gas is generated. There is no temperature region of 150 ° C. or less where the corrosion action by hydrogen chloride is large in the contact portion. Therefore, corrosion of the apparatus due to the hydrogen chloride gas, particularly corrosion of each part of the inner pipe, is appropriately prevented.
As the heating medium (granules) supplied into the passage 52 together with the resin material, the granules (for example, coke breeze, It is preferable to use one or more of fine ore, sintered powder, etc., and among them, it is most preferable to use fine coke.

The chlorine removing device 2 is not limited to those shown in FIGS. 2 to 12, but may be of any type and structure.
Synthetic resins that have been subjected to dechlorination by heating as described above are usually in a state in which most of the resin material except for the resin material containing chlorine is in a semi-molten or molten state. It is cooled by water cooling or the like in the device 2 or after being discharged from the device.
The synthetic resin material dechlorinated by the chlorine removing device 2 is sufficiently granulated in the device depending on the processing method of the dechlorination process, but if not, the synthetic resin material is pulverized by the pulverizing device 4 as necessary. , And processed into granules. Such a pulverizing treatment may be performed during the above cooling by water cooling or the like, or may be performed after the cooling. Therefore, the crushing device 4 may be integrated with the chlorine removing device 2 so that the synthetic resin immediately after the dechlorination process can be crushed while being cooled by water cooling or the like.

The synthetic resin material treated in the processing equipment 1 as described above is conveyed and supplied to the furnace by the supply means 4 as fuel or in a blast furnace or the like as a reducing agent of an iron source. The supply means 4 may be either a continuous type (for example, a conveyor or a pneumatic tube) or a batch type, but the pneumatic supply is most preferable in order to enable continuous supply to the furnace.
Note that the synthetic resin material supplied to the furnace may be temporarily stored in a storage hopper 5 as shown in the figure during the transportation by the supply means 4.
On the other hand, the hydrogen chloride discharged from the chlorine removing device 2 may be neutralized by sending it to, for example, a neutralizing device and reacting with alkali or alkaline earth. It is also possible to supply to equipment for recovery (hydrochloric acid recovery equipment).

FIG. 13 shows another configuration example of the processing method and equipment of the present invention. In the processing steps, a primary crushing step, a secondary crushing step, a sorting step (selection and removal of foreign substances), a dechlorination step, and a pulverizing step are performed. The process and the sieving process are sequentially performed, and in order to perform these processes, the primary crushing device 28, the secondary crushing device 29, the sorting device 30, the chlorine removing device 2, the crushing device 3, A device 31 is provided.
The synthetic resin received in this processing line is roughly crushed (in the case of a massive synthetic resin material, for example, crushed to a particle size of about 50 mm) in the primary crushing device 28, and then secondary crushed by a transfer means such as a conveyor. It is charged into the crushing device 29 and crushed secondarily (in the case of a massive synthetic resin material, for example, crushed to a particle size of about 20 mm). The primary crushed synthetic resin is removed by a magnetic separator 36 (a device that adsorbs and removes iron scraps and the like with a magnet and removes them) during the above-described conveyor conveyance and the like. .

The secondary crushed synthetic resins are loaded into the sorting apparatus 30 by a transfer means such as a conveyor, and foreign matters such as metals, earth and sand, and stones are separated and removed by a method such as wind sorting. Next, the synthetic resin is sent to the chlorine removing device 2, where the chlorine content of the chlorine-containing polymer resin material contained in the synthetic resin as described above is removed, and the chlorine content is substantially not contained. Synthetic resins are obtained. The system and configuration example of the chlorine removing device 2 are as described above.
The synthetic resin from which the chlorine content of the chlorine-containing polymer resin material has been removed in the chlorine removing device 2 is sent to a crushing device 3 (tertiary crushing device) after cooling, and is cooled to a predetermined particle size or less (eg, -6 mm). Pulverization is performed to obtain a granular synthetic resin material. As described above, the pulverizing device 4 may be integrated with the chlorine removing device 2 so as to be capable of performing a pulverizing process while cooling the synthetic resin immediately after the dechlorination process with water cooling or the like.

The granular synthetic resin material thus obtained is sieved by a sieving device 31, and only those having a predetermined particle size or less (for example, −6 mm) are supplied to the furnace through the storage silo 5 by the supply means 4. . On the other hand, the granular synthetic resin material exceeding the predetermined particle size is returned to the transport line on the entrance side of the crushing device 3 and is recharged into the crushing device 3 together with other synthetic resins. The coarse-grained synthetic resin material is taken out of the system and directly charged into other processes (for example, charging the furnace top into a blast furnace or a scrap melting furnace, directly charging a coke furnace or a sintering furnace, and the like). ).
In this configuration example, among the transfer means (paths) connecting the apparatuses, the transfer means 32a between the sorting device 30 and the chlorine removing device 2, the coarse synthetic resin material is sieved from the sieving device 31 to the crushing device 3 The transfer means 32b for returning to the entrance side and the transfer means 32c (part of the supply means 4) between the sieving device 31 and the storage silo 5 are each constituted by a pneumatic tube (33 in the figure is a blower), The synthetic resin material is pneumatically fed through these pneumatic tubes.

The granular synthetic resin material stored in the storage silo 5 is transferred to a blowing means 34 constituting a part of the supply means 4 by conveyor conveyance, pneumatic feeding, or the like, and is pneumatically fed to a furnace such as a blast furnace through the blowing means 34. It is blown into the furnace from the tuyere of the furnace.
The hydrogen chloride gas generated by the chlorine removing device 2 is sent to a hydrochloric acid recovery facility 35, where it is recovered as hydrochloric acid. The configuration example of the hydrochloric acid recovery facility 35 is as described above.
As described above, the proportion of the chlorine-containing polymer resin material in the synthetic resin supplied to the processing line may cause some variation with time due to the nature of waste, and is relatively high. If the period is limited to a short period (for example, about several hours to several tens of hours), it may be possible that only synthetic resins containing no chlorine-containing polymer resin material are supplied. In such a case, the synthetic resin that is temporarily supplied to the chlorine removing device 2 may not include any chlorine-containing polymer resin material.

In the configuration example shown in FIG. 13, the magnetic separator 36 is provided at only one location, but may be provided at a plurality of locations on the processing line.
The crushing method of each crushing device (including the crushing device 3) is arbitrary. In addition to the crushing method using only ordinary mechanical means, for example, a so-called frozen crushing method that crushes the object in a frozen state is used. It can also be applied.
Usually, incidental facilities such as a yard drying facility for incoming synthetic resin can be provided on the entrance side of the processing facility shown in FIG.

FIG. 14 shows another configuration example of the processing method and the equipment of the present invention, in which the supply means 4 includes a primary storage silo 5a into which the granular synthetic resin material obtained in the processing line is charged, and a primary storage silo 5a. A blowing station for pneumatically supplying the granular synthetic resin material supplied from the silo 5a to a blowing portion such as a blast furnace tuyere portion (hereinafter, the case where the "blowing portion" is the blast furnace tuyere portion). 55.
Since the configuration of the processing line of this configuration example is the same as that of FIG. 13, the same reference numerals are given and detailed description is omitted.

The granular synthetic resin material having a small particle size after being sieved by the sieving device 31 is transferred to the primary storage silo 5a through the transfer means 32c.
Between the primary storage silo 5a and the blowing station 55, a service tank 56 for receiving and temporarily storing the granular synthetic resin material supplied from the primary storage silo 5a in order from the upstream side, and the service tank 56 A lift tank 57 is provided for receiving the granular synthetic resin material supplied from the air supply station and pneumatically supplying it to the blowing station 55.

The granular synthetic resin material is supplied from the primary storage silo 5a to the service tank 56 by the transfer means 58. The transfer means 58 is composed of, for example, a fixed amount cut-out device and a transfer conveyor or a free-fall transfer duct or transfer pipe. The granular synthetic resin material is transferred from the service tank 56 to the lift tank 57 by the transfer means 59. The transfer means 59 is constituted by a free-fall type transfer pipe. A shutoff valve 60 is provided for supplying and stopping the material and maintaining the pressure in the lift tank.
An air supply pipe 62 from an accumulator 61 is connected to the lift tank 57 to supply air for air supply. The granular synthetic resin material in the lift tank 57 is supplied to the blowing station 55 through the pneumatic pipe 63 by the pneumatic air. In addition, the amount of pneumatic feeding of the granular synthetic resin material is controlled by the pressure of pneumatic air supplied into the lift tank 57.

  The blowing station 55 has a multi-stage tank for enabling continuous supply of the granular synthetic resin material to the tuyere portion of the blast furnace. In this configuration example, the secondary storage silo 64 is sequentially arranged from the upstream side. , A pressure equalizing tank 65 and a blowing tank 66, and the pneumatic pipe 63 is connected to a secondary storage silo 64. The granular synthetic resin material is supplied from the secondary storage silo 64 to the pressure equalizing tank 65 by the transfer means 67, and from the pressure equalizing tank 65 to the blowing tank 66 by the transfer means 68. Each of these transfer means 67, 68 is constituted by a free fall type transfer pipe, and in the middle thereof, for supplying and stopping the granular synthetic resin material and maintaining the pressure in the equalizing tank 65 and the blowing tank 66. Are provided.

  Granulation from the blowing tank 66 to the tuyere 71 of the blast furnace BF by a pneumatic tube 72 and a pneumatic branch tube 73 (74 is a distributor to each pneumatic branch tube 73 in the figure) communicating with each tuyere. The resin material is supplied by air. A fluidizing device 75 for mixing and fluidizing the particulate synthetic resin material discharged from the tank with a gas is provided at a position on the outlet side of the blowing tank of the pneumatic tube 72. The fluidizing device 75 also has a function of supplying and stopping the granular synthetic resin material. An air supply pipe 77 from an accumulator 76 is connected to the air supply pipe 72 to supply air for air supply. The pneumatic amount of the granular synthetic resin material from the blowing tank 66 is adjusted by adjusting the pressure in the blowing tank 66 by, for example, a booster (not shown). This is done by adjusting the flow rate of

15 and 16 show other examples of the structure of the blowing station 55, which do not have the pressure equalizing tank as shown in FIG. The tanks are provided in parallel to enable continuous supply of the granular synthetic resin material to the tuyere portion of the blast furnace.
The blowing station 55 shown in FIG. 15 is provided with a secondary storage silo 64a and a blowing tank 66a in parallel with a secondary storage silo 64b and a blowing tank 66b, and supplies air to the secondary storage silos 64a and 64b. The granular synthetic resin material can be appropriately distributed and charged by the distribution device 78 provided in the feed pipe 63. Granular synthetic resin material is supplied from the secondary storage silos 64a, 64b to the blowing tanks 66a, 66b by the transfer means 79a, 79b, respectively. Each of these transfer means 79a, 79b is constituted by a free-fall type transfer pipe, and intermittently provided with shut-off valves 80a, 80b for supplying and stopping the granular synthetic resin material and maintaining the pressure in the blowing tank. Is provided. Further, fluidizing devices 81a and 81b having the same function as the fluidizing device 75 of FIG. 14 are provided at the tank outlet side of the air supply pipes 720a and 720b connected to the blow tanks 66a and 66b. I have.
In the blowing station 55 shown in FIG. 15, three or more sets of parallel secondary storage silo-blowing tanks can be provided.

In addition, the blowing station 55 shown in FIG. 16 is provided with blowing tanks 66 a and 66 b in parallel at the outlet side of the secondary storage silo 64, and the transfer means 82 having the distribution device 83 transfers the granular synthesis from the secondary storage silo 64. The resin material can be appropriately distributed and supplied to each of the blowing tanks 66a and 66b. Shut-off valves 84a and 84b for supplying and stopping the granular synthetic resin material and maintaining the air pressure in the blow-in tank are provided in the middle of the branch pipe to each blow-in tank constituting the transfer means 82. . Further, fluidizing devices 85a, 85b having the same function as the fluidizing device 75 of FIG. 14 are provided at the tank outlet side of the air supply pipes 720a, 720b connected to the blowing tanks 66a, 66b. I have.
In the blowing station 55 shown in FIG. 16, three or more sets of parallel blowing tanks can be provided.

According to the processing equipment shown in FIG. 14, after being processed in the processing line, the granular synthetic resin material stored in the primary storage silo 5a is lifted via the service tank 56 through the transfer means 58, 59. The water is supplied to the tank 57, and then is pneumatically fed from the lift tank 57 to the blowing station 55 and charged into the secondary storage silo 64.
In the blowing station 55, the granular synthetic resin material is continuously pneumatically supplied from the blowing tank 66 to the blast furnace tuyere 71. In order to perform such continuous pneumatic supply, granular synthesis is performed from the secondary storage silo 64 to the equalizing tank 65 with the shut-off valve 70 of the transfer means 68 between the equalizing tank 65 and the blowing tank 66 closed. The resin material is charged (at the time of charging, the shut-off valve 69 of the transfer means 67 is in an open state), and when the remaining amount of the granular synthetic resin material in the blowing tank 66 decreases, the transfer means 67 is shut off. With the valve 69 closed, the shut-off valve 70 of the transfer means 68 is opened, and the granular synthetic resin material in the pressure equalizing tank 65 is supplied to the blowing tank 66. By repeating the above operation, the remaining amount of the granular synthetic resin material in the blowing tank 66 can always be secured, and the granular synthetic resin material can be continuously pneumatically supplied from the blowing tank 66.

When the blowing station 55 has a configuration as shown in FIG. 15, the granular synthetic resin material supplied from the lift tank 57 through the air supply pipe 63 is appropriately distributed to the secondary storage silos 64 a and 64 b by the distribution device 78. The secondary storage silos 64a, 64b supply the granular synthetic resin material from the secondary storage silos 64a, 64b to the blow-in tanks 66a, 66b according to the remaining amount of the granular synthetic resin material in the distribution tanks 66a, 66b.
The granular synthetic resin material is always pneumatically supplied from one of the blowing tanks 66a and 66b to the tuyere of the blast furnace, and the granular synthetic resin material is supplied from the secondary storage silo to the other blowing tank which does not perform the pneumatic supply. Is supplied. When switching between the blowing tanks 66a and 66b for replenishing and pneumatically supplying the granular synthetic resin material, the shutoff valves of the transfer means 79a and 79b between the secondary storage silos 64a and 64b and the blowing tanks 66a and 66b. The fluidizing devices 81a and 81b on the outlet sides of the blowing tanks 80a and 80b and the blowing tanks 66a and 66b are appropriately opened and closed.

When the blowing station 55 has a configuration as shown in FIG. 16, the granular synthetic resin material supplied from the lift tank 57 side through the air supply pipe 63 is charged into the secondary storage tank 64, By the distribution device 83 provided in the transfer means 82, the granular synthetic resin material in the blowing tanks 66a, 66b is appropriately distributed and charged into the tanks 66a, 66b according to the remaining amount.
The granular synthetic resin material is always supplied by pneumatic supply from one of the blowing tanks 66a and 66b to the tuyere portion of the blast furnace, and the granular synthetic resin material is supplied from the secondary storage silo 64 to the other blowing tank that does not perform the pneumatic supply. Replenishment of wood is performed. When switching between the blowing tanks 66a and 66b for replenishing and pneumatically supplying the granular synthetic resin material, the shutoff valves 84a and 84b of the transfer means 82 between the secondary storage silo 64 and the blowing tanks 66a and 66b are used. The fluidizing devices 85a and 85b on the outlet side of the blowing tanks 66a and 66b are appropriately opened and closed.

As described above, also in the blowing station 55 having the configuration shown in FIGS. 15 and 16, the granular synthetic resin material can be continuously pneumatically supplied from the blowing tanks 66a and 66b to the tuyere portion of the blast furnace.
Pneumatic air is supplied to the pneumatic tube 72 from an accumulator 76 through an air supply tube 77, and the granular synthetic resin material discharged from the blowing tanks 66, 66a, 66b is supplied by the air to the pneumatic tube 72 and the pneumatic branch tube. It is sent to a plurality of tuyere sections 71 through 73 and is blown into the blast furnace as fuel or the like.
Although the above description has been given of the example of blowing the synthetic resin material into the tuyere portion of the blast furnace, the synthetic resin material is similarly supplied to the synthetic resin material blowing portion such as the tuyere portion in other types of furnaces. A blow into the inside is performed.

17 to 19 show a more specific configuration example of the processing equipment of the present invention.
The processing line is, in order from the entry side, a supply conveyor 87 provided with a synthetic resin receiving hopper 86 at the end, and a primary crusher for receiving the synthetic resin conveyed by the supply conveyor 87 and coarsely crushing the same. Device 88, a conveyor 89 for transporting the synthetic resin roughly crushed by the primary crusher 88 to the secondary crusher, and receiving the synthetic resin transported by the conveyor 89, A secondary crusher 91 for crushing, a conveyor 92 for conveying the synthetic resins crushed by the secondary crusher 91 to the wind separator, and a synthetic resin conveyed by the conveyor 92 A wind separator 93 for removing foreign matter such as earth and sand, a metal, etc., a pneumatic tube 94 for pneumatically feeding the synthetic resin from which the foreign material has been removed by the wind separator 93, and a transfer by the pneumatic tube 94. A separator 95 for separating the separated synthetic resins from the air for pneumatics, and a plurality of chlorine removing devices 97a and 97b for receiving the synthetic resins discharged from the separator 95 via a sorting conveyor 96; A plurality of cushion tanks 98a, 98b for receiving the processed resin material discharged from the chlorine removing devices 97a, 97b, and a plurality of plastic tanks for receiving the synthetic resin supplied from each of the cushion tanks 98a, 98b and pulverizing them. Crushing devices 99a, 99b and sieving devices 101a, 101b for receiving the granular synthetic resin material pulverized by the crushing devices 99a, 99b through the input conveyors 100a, 100b and sieving the granular synthetic resin material. (Vibration discharger) and a small particle size sieved by the sieving devices 101a and 101b. It has a sub-sieve conveyor 102 and a pneumatic tube 103 for conveying the resin material, and a separator 104 for separating the granular synthetic resin material transferred by the pneumatic tube 103 from the air for pneumatic. The granular synthetic resin material separated by the separator 104 is charged into the primary storage silo 105 through a transfer pipe.

The processing line receives a synthetic resin material having a large particle diameter sieved by the sieving apparatuses 101a and 101b, and a sieve conveyor 106 and a pneumatic tube 107 for transferring the synthetic resin material. The separator 108 is provided for separating the synthetic resin material transferred by the above from the pneumatic air and then reloading the synthetic resin material into the crushing device 99a (and / or the crushing device 99b).
Further, a magnetic separator 109 is disposed above the transport conveyor 89.
The wind separator 93 inserts synthetic resins into a vertical zigzag passage 110 and blows air upward from below the passage 110 to separate and separate the synthetic resins from other foreign substances. Since synthetic resins are light, they rise up the passage 110 due to the wind force and are discharged to the air supply pipe 94. On the other hand, heavy foreign substances such as earth and sand and metal fall down the passage 110 and are discharged below the passage.
The configuration and the like of the chlorine removing devices 97a and 97b are as described above. However, the chlorine removing device of this configuration example is provided with a cooling mechanism for cooling the resin material after the dechlorination treatment is completed.
Further, the hydrogen chloride gas discharged from the chlorine removing devices 97a and 97b is guided to a hydrochloric acid recovery facility or the like outside the system, and is recovered as hydrochloric acid or the like.

  Further, the sorting conveyor 96 and the plurality of cushion tanks 98a, 98b are provided with a number of operating chlorine removers 97a, 97b and pulverizers 99a, 99b and a combination with these devices according to the amount of synthetic resin supplied to the processing line. It has a function of adjusting the supply amount of resins. For example, when the supply amount of the synthetic resin to the processing line is relatively small, the supply of the synthetic resin to only one of the chlorine removing devices 97a or 97b by the sorting conveyor 96 allows a plurality of chlorine resins to be supplied. Only a part of the removing device and the crushing device is operated. On the other hand, when the supply amount of the synthetic resin to the processing line is large, the sorting conveyor 96 supplies the synthetic resin to all the chlorine removing devices and the pulverizing devices, thereby operating the synthetic resin and further operating the synthetic resin. When the supply amount of the resins is excessive with respect to the processing capacity of the crushers 99a and 99b, the cushion tanks 98 and 98b serve to temporarily store the synthetic resins.

  In addition, since the synthetic resin is crushed or pulverized in the processing line, a large amount of fine synthetic resin material dust is generated in the pneumatic air after the pulverized synthetic resin material is pulverized or pulverized. include. As a configuration for treating such pneumatic air, pipes 111 and 112 for transferring the pneumatic air separated by the separators 95 and 104 to the dust collector, and the pneumatic air transferred by these pipes. A dust collector 113 that collects synthetic resin dust from the air, and a dust collector lower conveyor 114 that is a transfer means for transferring the collected synthetic resin dust and loading it into the primary storage silo 105 are provided.

The primary storage silo 85 is provided with a fixed amount cutout device 115, and the granular synthetic resin material cut out from the fixed amount cutout device 115 is supplied to the service tank 56 via the conveyor 116.
Since the configuration downstream of the service tank 56 (including the blowing station 55) is the same as the configuration example shown in FIG. 14, the same reference numerals are given and the detailed description is omitted.
In the other drawings, 117 is a blower provided in each pneumatic tube.

FIG. 20 shows another configuration example of the processing equipment of the present invention, in which a secondary wind sorter 118 is provided between the primary storage silo 105 and the service tank 56, and the secondary wind sorter 93 cannot be completely removed by the upstream wind sorter 93. Foreign matter can be removed. The granular synthetic resin material cut out from the fixed amount cutout device 115 of the primary storage silo 105 is supplied to the secondary wind power sorter 118 via a conveyor 116.
The basic structure of the secondary wind sorter 118 is the same as that of the wind sorter 93 described above. Between the secondary wind separator 118 and the service tank 56, a pneumatic pipe 119 for pneumatically feeding the granular synthetic resin material from which foreign matter has been removed by the secondary wind separator 118, and transported by the pneumatic pipe 119. A separator 120 for separating the separated granular synthetic resin material from the pneumatic air, and a transport conveyor 121 for transporting the granular synthetic resin material discharged from the separator 120 to the service tank 56 are provided. .

Next, processing steps for processing synthetic resins by the above-described equipment shown in FIGS. 17 to 20 will be described.
After the synthetic resins are charged into the receiving hopper 86 on the side of the processing line, they are charged into the primary crushing device 88 via the supply conveyor 87 and coarsely crushed (for example, crushed to an average particle size of about 50 mm). Next, it is charged into the secondary crushing device 91 by the transport conveyor 89 and crushed secondarily (for example, crushed to an average particle diameter of about 20 mm). The primary crushed synthetic resin is removed by a magnetic separator 109 in the middle of the transport conveyor 89 by a magnetic separator 109.

  The secondary crushed synthetic resins are loaded into a wind separator 93 by a conveyor 92, where foreign substances such as metals, earth and sand, and stones are separated and removed by the wind separator. The synthetic resins subjected to such sorting are pneumatically fed to a separator 95 through a pneumatic pipe 94, where they are separated from pneumatic air, and then loaded into chlorine removal devices 97a and 97b via a sorting conveyor 96. Here, a dechlorination treatment by heating is performed. The treated resin material discharged from the chlorine removing devices 97a and 97b is charged into cushion tanks 98a and 98b, and then sent to each of the pulverizing devices 99a and 99b (tertiary crusher) to have a predetermined particle size (for example, average). The particle size is reduced to 6 mm or less to obtain a granular synthetic resin material.

  The granular synthetic resin material is charged into the sieving apparatuses 101a and 101b via the charging conveyors 100a and 100b and sieved. After being transferred to the separator 104 through the pipe 103 and separated from the pneumatic air by the separator 104, it is charged into the primary storage silo 105. On the other hand, the synthetic resin material exceeding a predetermined particle size is transferred to a separator 108 through a sieve conveyor 106 and a pneumatic tube 107 and separated from pneumatic air, and then crushed by a crushing device 99a (and / or a crushing device 99b). And then crushed again.

The pneumatic air separated by the separators 95 and 104 is sent to the dust collector 113 through the pipes 111 and 112 to collect the synthetic resin dust, and the synthetic resin dust is collected by the primary conveyor silo 105 by the conveyor 114 below the dust collector. Will be charged.
The granular synthetic resin material stored in the primary storage silo 105 is supplied to the lift tank 57 via the service tank 56 by the fixed quantity cutting device 115 and the conveyor 116, and is pneumatically fed from the lift tank 57 to the blowing station 55. You. Note that the subsequent steps are the same as those described for the configuration example in FIG.

  Further, in the equipment shown in FIG. 20, the granular synthetic resin material stored in the primary storage silo 105 is supplied to a secondary wind separator 118 by a constant-quantity cutting device 115 and a conveyor 116, and foreign matter is separated and removed by wind separation. Then, the air is sent to a separator 120 through a pneumatic pipe 119 and separated from the air for air supply. Thereafter, the air is supplied to a lift tank 57 via a conveyor 121 and a service tank 56. From 57, the air is sent to the blowing station 55.

  The granular synthetic resin material supplied to the furnace is preferably processed to have a bulk density of 0.30 or more and a repose angle of 40 ° or less. As described above, the prior art proposes that the bulk density of the crushed synthetic resin be 0.35 or more. On the other hand, according to the study by the present inventors, if the bulk density of the granular synthetic resin material is 0.30 or more, there is no problem in pneumatically feeding the granular synthetic resin material including the point of pressure loss and the like. In addition, troubles such as bridges (shelf hanging) in storage silos of granular synthetic resin materials and clogging around curved pipes and valves in the pneumatic piping system are caused by the bulk density of granular synthetic resin materials. It has little relation to the above, and it has been found that the effect is greatly influenced by the grain shape of the granular synthetic resin material, and the effect of suppressing the occurrence of the trouble based on the grain shape can be arranged by the angle of repose of the granular synthetic resin material.

  FIG. 21 shows the supply angle of the synthetic resin material having a particle size of 6 mm or less obtained by pulverization after dechlorination, such as the angle of repose, bridge (shelf hanging) in the storage silo, and clogging in the air supply pipe. The relationship with the frequency of occurrence is shown for each granular synthetic resin material having a different bulk density. In addition, the supply trouble occurrence frequency is as follows: The supply trouble occurrence frequency index when a granular synthetic resin material having a particle diameter of 6 mm or less, a repose angle of 40 °, and a bulk density of 0.40 is supplied to a furnace is “1”. The index shows the frequency of supply trouble occurrences compared to. The presence or absence of supply trouble is monitored by constantly monitoring the weight fluctuation of the granular synthetic resin material in the storage silo, and when the state of weight fluctuation: 0 continues for a predetermined time (for example, about 10 minutes), a trouble occurs (silo cutout section or Clogging occurred during the pneumatic tube).

According to FIG. 21, it can be seen that the supply trouble as described above can be appropriately prevented by setting the angle of repose to 40 ° or less regardless of the bulk density of the granular synthetic resin material. Therefore, in the pulverization treatment after the dechlorination treatment, it is preferable to appropriately select a crushing method or the like in order to achieve a repose angle of 40 ° or less.
The particle size of the granular synthetic resin material obtained by processing in the present invention is preferably 10 mm or less, and more preferably 4 to 8 mm, from the viewpoint of flammability and the like.
The method for treating synthetic resins of the present invention can be applied to various furnaces including a blast furnace, a scrap melting furnace, a rotary kiln and the like.
In the present invention, the synthetic resin heated in the dechlorination treatment step is cooled and solidified. However, when the synthetic resin is heated to a higher temperature in the dechlorination treatment step, the synthetic resin has a high chlorine content. After the chlorine content in the molecular resin is desorbed, the whole amount becomes oily. Therefore, in some cases, a method in which such oily synthetic resins are directly supplied to a furnace and blown into the furnace may be adopted.

  The synthetic resins to be treated by the present invention are mainly synthetic resins which are waste (including waste as so-called garbage, debris and defective products generated during production and processing in factories, etc.), Synthetic resins to which foreign substances (metals, paper, other inorganic substances and organic substances) other than synthetic resins are attached or mixed in due to their properties are also applicable. Specific examples of such waste synthetic resins include plastic bottles, plastic bags, plastic wraps, plastic films, plastic trays, plastic cups, magnetic cards, magnetic tapes, IC cards, flexible containers, printed circuit boards, printed sheets, electric wires. Coating materials, bodies and frames for office equipment or home appliances, decorative plywood, pipes, hoses, synthetic fibers and clothing, plastic molded pellets, urethane materials, packing sheets, packing bands, packing cushioning materials, electrical components, toys , Stationery, toner, automotive parts (for example, interior parts, bumpers), shredder dust for automobiles and home appliances, ion exchange resins, synthetic paper, synthetic resin adhesives, synthetic resin paints, solid fuels (reduced plastic volume reduction) Material).

  Among the synthetic resins that are brought into the treatment facility as waste, those that do not contain the chlorine-containing polymer resin and can be directly supplied to the furnace by pneumatic supply because the form is already granular (for example, granular ion (Replacement resin material, synthetic resin pellets for molding processing, synthetic resin spheres for toys, etc.) can be supplied to a furnace by directly charging them into a storage silo without going through the processing according to the present invention. Needless to say.

The synthetic resin containing the chlorine-containing polymer resin shown in Table 1 was supplied to the synthetic resin processing equipment of the present invention shown in the flowchart of FIG. 13 equipped with the chlorine removing device shown in FIG. The following granular synthetic resin materials were processed and temporarily stored in a storage silo, then pneumatically fed into a blast furnace through a pneumatic pipe system, and blown into the furnace from the tuyere with pulverized coal.
Table 2 shows the composition of the granular synthetic resin material after the processing and the supply amount to the blast furnace, and Table 3 shows the operating conditions of the blast furnace.
The conditions for pneumatically feeding the granular synthetic resin material to the blast furnace are as follows.
Pneumatic gas: air-solid ratio: 4.5 kg / kg

As a result of the above-mentioned processing of synthetic resins and supply to the blast furnace, there was no hindrance to the operation of the blast furnace itself, and the silo storage section and pneumatic pipe for storing the granular synthetic resin material to be supplied to the blast furnace. Supply troubles such as clogging in the system hardly occurred.
Further, as shown in Table 2, most of the chlorine content in the synthetic resin was removed by the processing. Therefore, even when the furnace top gas was sampled during the entire operation and the gas composition was analyzed, the Cl was almost completely removed. Not detected.

Explanatory drawing showing one configuration example of the processing method and equipment of the present invention. Explanatory drawing showing an example of the configuration of a pyrolysis furnace type chlorine removal apparatus Explanatory drawing showing one configuration example of a chlorine removal device of a screw extrusion type Explanatory drawing showing an example of a configuration of a twin-screw extrusion type chlorine removing apparatus. Explanatory view conceptually showing one configuration example of a rotary kiln type chlorine removal device Fig. 5 is a cross-sectional view of the rotary kiln main body. Explanatory diagram showing another example of the configuration of a rotary kiln-type chlorine removal device Explanatory diagram showing another example of the configuration of a rotary kiln-type chlorine removal device Cross-sectional view of the rotary kiln body of FIG. Explanatory diagram showing another example of the configuration of a rotary kiln-type chlorine removal device Cross-sectional view of the rotary kiln body of FIG. Cross-sectional view showing another example of the configuration of a rotary kiln-type chlorine removal device Explanatory drawing showing another configuration example of the processing method and equipment of the present invention. Explanatory drawing showing another configuration example of the processing method and equipment of the present invention. Explanatory drawing which shows the other example of a structure of the blowing station in the installation shown in FIG. Explanatory drawing which shows the other example of a structure of the blowing station in the installation shown in FIG. Explanatory drawing partially showing a more specific configuration example of the processing equipment of the present invention Explanatory drawing partially showing a more specific configuration example of the processing equipment of the present invention Explanatory drawing partially showing a more specific configuration example of the processing equipment of the present invention Explanatory drawing partially showing another more specific configuration example of the processing equipment of the present invention. Graph showing the relationship between the angle of repose and the occurrence frequency of supply trouble for granular synthetic resin materials obtained by pulverization treatment, for each granular synthetic resin material with different bulk density

Explanation of reference numerals

  DESCRIPTION OF SYMBOLS 1 ... Processing equipment, 2 ... Chlorine removal apparatus, 3 ... Crushing apparatus, 4 ... Supply means, 5, 5a ... Storage hopper, 6 ... Pyrolysis furnace main body, 7 ... Screw feeder, 8 ... Stirring blade, 9 ... Extraction port , 9a ... shut-off valve, 10 ... discharge port, 11 ... supply port, 12 ... motor, 13 ... screw feeder, 14 ... supply port, 15 ... extraction port, 16 ... discharge port, 17 ... heating device, 18, 19 ... motor , 20: Screw feeder, 21a, 21b: Supply port, 22: Supply screw feeder, 23: Extraction port, 24: Heat medium supply port, 25: Discharge port, 26, 27 ... Motor, 28: Primary crusher, 29 ... Secondary crushing device, 30 ... Sorting device, 31 ... Sieving device, 32a, 32b, 32c ... Transfer means, 33 ... Blower, 34 ... Blowing means, 35 ... Hydrochloric acid recovery device, 36 ... Magnetic separator, 37 ... B Tally kiln body, 38: refractory, 39: iron skin, 40: passage, 41: screw feeder, 42: supply port, 43: hot air conduit, 44: discharge device, 45: discharge port, 46: exhaust gas discharge port, 47 ... Hot air generator, 48 drive motor, 49 rotary kiln body, 50 outer tube, 51, 51a, 51b, 51c inner tube, 52, 53 passage, 54 gas conduit, 55 blowing station, 56 service Tank, 57 ... Lift tank, 58, 59 ... Transfer means, 60 ... Shut-off valve, 61 ... Accumulator, 62 ... Air supply pipe, 63 ... Pneumatic pipe, 64, 64a, 64b ... Secondary storage silo, 65 ... Equalization Tank, 66, 66a, 66b: blow tank, 67, 68: transfer means, 69, 70: shut-off valve, 71: tuyere, 72: pneumatic tube, 73: pneumatic support tube, 74: distributor, 7 ... fluidizer, 76 ... accumulator, 77 ... air supply pipe, 78 ... distributor, 79a, 79b ... transfer means, 80a, 80b ... shut-off valve, 81a, 81b ... fluidizer, 82 ... transfer means, 83 ... distribution Devices, 84a, 84b ... shut-off valves, 85a, 85b ... fluidization devices, 86 ... receiving hoppers, 87 ... supply conveyors, 88 ... primary crushers, 89 ... transport conveyors, 91 ... secondary crushers, 92 ... transport conveyors, 93: Wind separator, 94: Pneumatic tube, 95: Separator, 96: Sorting conveyor, 97a, 97b: Chlorine remover, 98a, 98b: Cushion tank, 99a, 99b: Crusher, 100a, 100b: Feeding conveyor , 101a, 101b ... sieving device, 102 ... sub-sieve conveyor, 103 ... pneumatic tube, 104 ... separator, 105 ... primary storage silo, 106 ... sieve Upper conveyor, 107: Pneumatic tube, 108: Separator, 109: Magnetic separator, 110: Passage, 111, 112: Piping, 113: Dust collector, 114: Dust collector lower conveyor, 115: Quantitative cutting device, 116: Conveyor, 117: blower, 118: secondary wind separator, 119: pneumatic tube, 120: separator, 121: transport conveyor, 720a, 720b: pneumatic branch

Claims (9)

A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying the same to the furnace as a reducing agent for a fuel and / or iron source,
A synthetic resin processing method, wherein the synthetic resin processing step includes a step of heating and dechlorinating the synthetic resin. A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying the same to the furnace as a reducing agent for a fuel and / or iron source,
A step of heating and dechlorinating the synthetic resin, a step of pulverizing the synthetic resin after the step while cooling or after cooling, and a step of subjecting the granular synthetic resin material after the pulverization to fuel and / or Supplying a furnace as a reducing agent for an iron source to a furnace. A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying the same to the furnace as a reducing agent for a fuel and / or iron source,
A step of crushing the synthetic resin, a step of heating and dechlorinating the synthetic resin after the step, and a step of pulverizing the synthetic resin after the step while cooling or after cooling, Supplying the granular synthetic resin material after the pulverization treatment to a furnace as a reducing agent for a fuel and / or iron source. A method for processing a synthetic resin into a shape suitable for supply into the furnace, and then supplying the same to the furnace as a reducing agent for a fuel and / or iron source,
A step of crushing the synthetic resin, a step of heating and dechlorinating the synthetic resin after the step, and a step of pulverizing the synthetic resin after the step while cooling or after cooling, A step of sieving the granular synthetic resin material after the pulverizing treatment to a particle size suitable for pneumatic supply, and reducing the granular synthetic resin material having a small particle diameter sieved in the sieving step to a fuel and / or iron source Pneumatically supplying the mixture as a chemical to a furnace and blowing it into the furnace.   5. The method for treating synthetic resins according to claim 1, wherein the synthetic resins are heated to 250 to 350 [deg.] C. in the step of heating and dechlorinating the synthetic resins.   The granular synthetic resin material supplied to the furnace after the pulverizing step is a granular material having a bulk density of 0.30 or more and a repose angle of 40 ° or less, wherein the granular synthetic resin material is a granular material having a repose angle of 40 ° or less. A method for treating the synthetic resins described in the above. Equipment for processing synthetic resin into a shape suitable for supply into the furnace, and then supplying it to the furnace as a reducing agent for fuel and / or iron source,
A chlorine removing device for heating and dechlorinating the synthetic resin, a crushing device for crushing the synthetic resin subjected to the treatment by the device while cooling or after cooling, and a crushing process by the device Supply means for supplying the granular synthetic resin material afterward to a furnace as a reducing agent for a fuel and / or iron source. Equipment for processing synthetic resin into a shape suitable for supply into the furnace, and then supplying it to the furnace as a reducing agent for fuel and / or iron source,
A primary or multiple primary crushing device for crushing synthetic resins, a chlorine removing device for heating and dechlorinating the synthetic resins crushed by the device, and a treatment by the device. A pulverizing device for pulverizing the synthetic resin while cooling or after cooling, and a sieving device for sieving the granular synthetic resin material after the pulverizing process by the device to a particle size suitable for pneumatic supply; Supply means for pneumatically supplying the granular synthetic resin material having a small particle diameter sieved by the apparatus to a furnace as a reducing agent for a fuel and / or an iron source, and blowing the mixture into the furnace. Processing equipment.   A supply means, a primary storage silo for receiving the granular synthetic resin material transferred from the crushing device or the sieving device, and a blowing station for pneumatically supplying the granular synthetic resin material supplied from the primary storage silo to a furnace. Comprising, at least, a secondary storage silo charged with the granular synthetic resin material supplied from the primary storage silo, and a granular synthetic resin material supplied from the secondary storage silo side, 9. A blow tank for pneumatically feeding this into a furnace, and having a configuration capable of continuously supplying a granular synthetic resin material from the blow tank to a blow section of the furnace. Processing equipment for synthetic resins.

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