JP2002146373A - Method for processing synthetic resin into furnace fuel and method for blowing fuel into furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To process synthetic resins such as plastic as a waste into blowing fuel for furnace such as blast furnace regardless of the form or the like thereof. SOLUTION: In a method for processing the synthetic resins into furnace fuel in a processing facility, synthetic resins mainly containing a film-like synthetic resin material are thermally melted or semi-melted and then solidified. Thereby, these synthetic resins are processed into a volume-reduced particulate synthetic resin material having >=0.30 bulk density and <=40 deg. angle of repose. In the other method, the synthetic resins mainly containing bulky synthetic resin material are crushed. Thereby, these synthetic resins are processed into a particulate synthetic resin material having >=0.30 bulk density and <=40 deg. angle of repose.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for pneumatically feeding synthetic resins such as plastics to furnaces such as blast furnaces and scrap melting furnaces.
The present invention relates to a method for treating and supplying synthetic resins when used as a fuel for injection.

[0002]

2. Description of the Related Art In recent years, synthetic resins such as plastics have rapidly increased as industrial wastes and general wastes, and their disposal has become a major problem. Among these, plastics, which are high-molecular hydrocarbon compounds, generate a large amount of heat during combustion, and when incinerated, damage to the incinerator makes mass treatment difficult, and most of them are dumped in landfills. That is the current situation. However, dumping of plastics and the like is not preferable in terms of environmental measures, and development of a large-scale treatment method is eagerly desired.

[0003] Against this background, a method of using synthetic resins such as plastics as auxiliary fuel for blast furnaces and the like is disclosed in EP-A-0 622 465 A1 and Japanese Patent Publication No. 51-1979.
No. 33493. In these methods, a synthetic resin pulverized material is blown into a blast furnace from a tuyere or the like as a fuel. For example, in the former, as a substantial condition of the synthetic resin pulverized material blown into the furnace, a particle size of 1 to 10 m
m and a bulk density of 0.35 or more are shown.

[0004]

However, as a result of repeated experiments and studies by the present inventors, it has been found that synthetic resins such as plastics (hereinafter, "plastic" will be described as an example) are fed to a blast furnace or the like. When used as fuel for injection, it became clear that there were the following problems to be solved.

[0005] When plastics discarded as industrial waste or general waste are classified by form, they are roughly classified into bulk plastics such as plate materials and film-like plastics. Of these, the latter film-like plastics also constitute the entire waste plastics. Occupy a considerable amount in the inside. However, pulverized film plastic has extremely poor transportability and fluidity,
It has been found that there is a major problem in handleability when used as a fuel. That is, when blowing plastic into the blast furnace as fuel, a method of cutting out the plastic stored in a storage silo or the like and pneumatically supplying the plastic to the blast furnace is adopted,
Since film plastic has extremely poor fluidity, pulverized material containing a considerable amount of it tends to cause bridges (shelf hanging) in storage silos, which makes it impossible to cut out fixed amounts of pulverized plastic from storage silos. In addition, troubles such as clogging of the cut-out portion of the storage silo and the inside of the pneumatic tube (especially around the curved tube portion and the valve) and the inability to supply air to the blast furnace occur frequently. , Turned out to be a serious problem.

[0006] Therefore, it is practically impossible to use film plastic as a blowing fuel for a blast furnace or the like unless the above problems are solved. It is clear that the advantages of mass processing and effective use of waste plastics will be lost unless film plastics can be used.

In order to inject plastic as fuel into a blast furnace, it is necessary to use plastic that has been pulverized in order to ensure flammability and the like. However, the particle size that can be pulverized is limited from the viewpoint of processing cost. Therefore, as shown in the prior art, a grain size of about 1 to 10 mm is a limit of grain refinement. However, the crushed lump plastic has an irregular and square shape, so if it has a particle size of about 1 to 10 mm, it can be easily discharged from storage silos and flowable when pneumatically fed to a blast furnace. In addition, it has been found that there is a problem that the transferability is poor, and the clogging is easily caused in the cutout portion of the silo or in the middle of the pneumatic pipe system. Therefore, as proposed in the prior art, simply pulverizing plastic to a particle size of about 1 to 10 mm and processing it into a granular material having a high density and blowing it into a blast furnace can only reduce plastic as waste. It is extremely difficult to use it as an injection fuel for blast furnaces and the like on an industrial scale.

The present invention solves the above-mentioned problems of the prior art, and pneumatically feeds and blows synthetic resin such as plastic into a furnace such as a blast furnace or a scrap melting furnace regardless of its form. It is an object of the present invention to provide a method for processing synthetic resin and a method for injecting fuel, which can be processed into fuel and further supplied to a furnace as a injected fuel. It is another object of the present invention to provide a method of processing synthetic resin and a method of injecting fuel, which can effectively improve the transportability and combustibility of synthetic resin supplied to a furnace.

[0009]

The structure of the present invention for achieving the above object is as follows. [1] A method for processing synthetic resins into furnace fuel for pneumatic blowing and blowing in processing equipment, wherein synthetic resins mainly composed of a film-like synthetic resin material are melted or semi-finished by heat. Processing of synthetic resin into furnace fuel, characterized in that it is solidified after being melted to reduce its volume and solidified and is processed into a granular synthetic resin material having a bulk density of 0.30 or more and a repose angle of 40 ° or less. Method.

[2] In the processing method of the above [1], the step of processing the synthetic resin mainly composed of a film-like synthetic resin into a granular synthetic resin is at least heating and melting the synthetic resin. And then cooling and solidifying; and a step of cutting or pulverizing the solidified synthetic resin material to obtain a granular synthetic resin material. .

[3] This is a method for processing synthetic resins into furnace fuel for pneumatic feeding and blowing in a processing equipment, in which synthetic resins mainly composed of massive synthetic resin material are pulverized. The bulk density is 0.30 or more and the angle of repose is 40 °
A method for processing synthetic resin into furnace fuel, wherein the method is processed into the following granular synthetic resin material. [4] In the processing method according to any one of the above [1] to [3], the particle size of the granular synthetic resin material obtained by the processing is 4 to
A method for processing synthetic resin into furnace fuel, which is 10 mm.

[5] A method for processing a synthetic resin in a processing equipment, pneumatically supplying it to a furnace as a fuel, and blowing it into the furnace, wherein the synthetic resin mainly composed of a film-like synthetic resin material is used. After being melted or semi-molten by heat and then solidified, the volume is reduced and the bulk density is reduced to 0.
Fuel injection into the furnace, comprising: a step of processing into a granular synthetic resin material having a repose angle of 30 or more and 40 ° or less, and a step of pneumatically feeding the granular synthetic resin material into the furnace and blowing it into the furnace. Method.

[6] In the fuel injection method of the above [5],
The step of processing the synthetic resin mainly composed of a film-like synthetic resin material into a granular synthetic resin material includes at least a step of heating and melting the synthetic resin and then cooling and solidifying the synthetic resin; Obtaining a granular synthetic resin material by cutting or pulverizing the fuel.

[7] A method for pneumatically supplying synthetic resin as a fuel to a furnace after processing it in a processing equipment and blowing it into the furnace, wherein the synthetic resin mainly composed of massive synthetic resin material is pulverized. It is characterized by comprising a step of processing into a granular synthetic resin material having a bulk density of 0.30 or more and a repose angle of 40 ° or less by processing, and a step of blowing the granular synthetic resin material into a furnace and blowing it into the furnace. How to inject fuel into the furnace. [8] In the fuel injection method according to any one of the above [5] to [7], the particle size of the granular synthetic resin material obtained by the processing is 4 to
A method for injecting fuel into a furnace, wherein the method is 10 mm.

The method of the present invention can be applied not only to blast furnaces and scrap melting furnaces, but also to any kind of furnaces which can use synthetic resins as fuel. When a synthetic resin material is blown into a melting furnace such as a blast furnace or a scrap melting furnace, the synthetic resin material also functions as a reducing agent for an iron source.However, the method of the present invention assumes that the synthetic resin material functions in this manner. It does not matter whether the main purpose of blowing the synthetic resin material into the furnace is as a pure fuel or as a reducing agent for an iron source.

[0016]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, the presence of a film-like synthetic resin material in waste synthetic resin makes it virtually impossible to use the synthetic resin as a fuel for pneumatic blowing and blowing into a furnace. In view of the above findings, especially for the film-like synthetic resin material, it was found that when processed by a specific method, a granular synthetic resin material having extremely excellent fluidity, transportability and flammability can be obtained. In particular, from the viewpoint of ensuring high dischargeability of granular synthetic resin materials from storage silos and transportability in pneumatic pipes, it is essential that the angle of repose of granular synthetic resin materials be in a specific numerical range. And a method for processing synthetic resins and a method for injecting fuel, which are configured based on these findings.

FIG. 1 is a flowchart showing an embodiment of the processing method and the fuel injection method of the present invention. The present invention will be described below based on this flowchart. In the present embodiment, the synthetic resins to be provided as fuel are classified into a synthetic resin (A) mainly composed of a film-shaped synthetic resin material and a synthetic resin (B) mainly composed of other synthetic resins (ie, mainly composed of a massive synthetic resin material). Accepted in the processing equipment in a separated state. Here, the synthetic resin (A) may include, in addition to the film-shaped synthetic resin material, another type of synthetic resin material having difficulty in fluidity and transportability, for example, foamed plastic.

Although there is no particular limitation on the film-like synthetic resin material, it has been confirmed by the present inventors through experiments that a synthetic resin film having a thickness of 100 μm or less is particularly inferior in fluidity and transportability. For this reason, it is preferable that the synthetic resin film having a thickness of 100 μm or less be separated into the synthetic resins (A) as far as it can be separated. However, it is needless to say that the present invention is not necessarily limited to such a sorting criterion. In addition to ultra-thin materials such as polyethylene films, relatively thick synthetic resins such as those used in so-called PET bottles are also available. It can be included in the synthetic resins (A). In addition, whether or not to be classified into the synthetic resins (A), in addition to the thickness, the component composition and material of the synthetic resins (for example, when a composite material other than synthetic resins is included, Otherwise, it is determined according to factors such as form. On the other hand, as the synthetic resin (B), a bulk synthetic resin material such as a plate material is mainly used, but it is needless to say that the synthetic resin (B) is not limited to this.

In short, taking into account the fluidity and transportability of the collected synthetic resins, at least those which are extremely poor in fluidity and transportability when crushed, such as a polyethylene film, are made of synthetic resins (A ), And bulk plastics with better fluidity and transportability are classified into synthetic resins (B), and the others are synthetic resins in consideration of fluidity and transportability. What is necessary is just to classify into either (A) or (B).

When viewed as a whole fuel conversion system, all of the synthetic resin materials to be supplied as a fuel are converted into synthetic resin (A), and all of the synthetic resin materials in a lump. Need not be strictly separated into synthetic resins (B), and such strict separation is actually difficult in view of the nature of waste.
Therefore, it is permissible that the synthetic resin (A) contains the bulk synthetic resin material and the like and the synthetic resin (B) contains the film synthetic resin material and the like to some extent.

In FIG. 1, X represents a processing line for a synthetic resin (A) mainly composed of a film-shaped synthetic resin material, and Y represents a processing line for a synthetic resin (B) mainly composed of a massive synthetic resin material. Processing lines X
In the case, the synthetic resin (A) is melted or semi-molten by heat and then solidified to reduce the volume (solidification = volume reduction)
In the processing line Y, the synthetic resin (B) is pulverized and processed into a granular synthetic resin material (b).

In the processing line X, the synthetic resin (A) is crushed (or coarsely crushed) by a crusher 1 if necessary, and then charged into a granular solidifying device 2 by conveyor conveyance or the like, where it is reduced. It is processed into solidified granular synthetic resin material (a). Further, in the course of the above-mentioned conveyor conveyance, the iron scrap mixed in the synthetic resin is removed by the magnetic separator 4 (a device that adsorbs and removes iron scrap and the like by a magnet). When the synthetic resin (A) is crushed by the granular solidifying device 2 described below, the crushing by the crusher 1 is not always necessary, and in that case, the crusher 1 is not required. Good.

In the granular solidifying apparatus 2, the synthetic resin (A) is reduced in volume and solidified by any one of the following methods to obtain a granular synthetic resin material (a). A method in which the synthetic resin (A) is heated and melted, then cooled and solidified, and the solidified synthetic resin material is cut or crushed. The synthetic resin (A) is cut or crushed. The cut or crushed synthetic resin material may be heated or semi-molten by the frictional heat generated by the cutting or crushing, and the semi-melted synthetic resin material may be used instead of the granular solidifying device. To obtain a granular synthetic resin material (a) by shrinking and solidifying by quenching, and then subjecting the shrinking and solidifying synthetic resin material to a granular shrinkage or solidification process by a pulverizing treatment.

In one embodiment of the above method, the synthetic resin (A) is cut or crushed by a high-speed rotating rotary blade, and the synthetic resin material is semi-melted by frictional heat generated by the cutting or crushing. The molten synthetic resin material is contracted and solidified by quenching by water spray etc.,
At this time, a method of obtaining a granular synthetic resin material (a) by shrinking and solidifying into a granular form or simultaneously performing the pulverizing treatment with the rotary blade simultaneously with the shrinking and solidifying.

Of these methods, a typical example is a method in which the synthetic resin (A) is completely melted, extruded into a linear shape or the like by an extruder, and then cut into granules. Although this is a method of obtaining the resin material (a), various other processing methods can be adopted.

On the other hand, the method of
(A) is not completely melted, but is shrunk and solidified by quenching from a semi-molten state by water spraying or the like, and in this case, it is shrunk and solidified into granules, or the shrunk and solidified product is pulverized into granules. This is a method for obtaining a granular synthetic resin material (a). The present inventors have particularly proposed such a granular synthetic resin material (a) obtained by the method (particularly the method).
However, not only pulverized material of film-like synthetic resin material, but also very excellent fluidity and transportability, and very good flammability, even compared to pulverized material of bulk synthetic resin material Therefore, in the fuel injection method of the present invention, the granular solidification device 2 performs the granular shrinkage-solidification or shrinkage-solidification-granulation treatment of the synthetic resin (A) by the above method or the above-mentioned method. Most preferably, the synthetic resin material (a) is obtained.

FIG. 2 shows an example of a configuration for performing the granular shrinkage-solidification or the continuous processing of shrinkage-solidification-granulation by the above-described method. The synthetic resin loaded in the granular solidification device 2 is shown in FIG.
(A) is crushed by the crushing device 12 and then reduced in volume by the solidifying device 13.
Will be charged. In the volume reducing and solidifying device 13, synthetic resin
(A), the heating chamber 15 and the cooling chamber 16 following the heating chamber 15 are continuously conveyed by a conveying device 17 (conveying belt or the like) and heated in the heating chamber 15 (gas heating, gas indirect heating, electric heating, etc.)
After being semi-molten by this, it is rapidly cooled by water spray or the like in the cooling chamber 16 and contracted and solidified. At this time, synthetic resins (A)
The synthetic resin material can be contracted and solidified in a granular form by appropriately selecting the crushing form and the state of charging into the heating chamber, and therefore, according to this method, the granular synthetic resin material (a) can be obtained as it is in the contracted and solidified state. Can be

On the other hand, in the method in which a part or the whole of the synthetic resin material is not shrunk and solidified in a granular form, the shrinked and solidified synthetic resin material is charged from a volume reducing and solidifying device 13 into a pulverizing device 14 and granulated by the pulverizing device 14. The granular synthetic resin material (a) is obtained by the pulverizing treatment. Since the granular synthetic resin material (a) obtained as described above is obtained by shrinking and solidifying or shrinking and solidifying the crushed film-like synthetic resin material from a semi-molten state to a granular state, this is a pulverized treatment. It is relatively porous and has a large specific surface area compared to the crushed lump of synthetic resin material, and it is not rounded like the crushed lump of synthetic resin material, but is rounded as a whole Due to its shape, it exhibits excellent flammability and fluidity.

FIG. 3 schematically shows the principle of the granular shrinkage-solidification or shrinkage-solidification-granulation treatment performed by the above-described method. The rotary blade 1 for rotating the synthetic resin (A) at a high speed is shown in FIG.
8, the synthetic resin material is semi-molten by the frictional heat generated by the cutting or crushing, and then the semi-molten synthetic resin material is rapidly cooled from the above temperature by water spray or the like, thereby shrinking into individual pieces. At this time, the particles are shrunk and solidified, or at the same time as the shrinkage and solidification, are pulverized by the rotary blade 18 to obtain a granular synthetic resin material (a). In this method, all of the crushing (or cutting) processing, semi-solidification processing and pulverization processing after shrinkage solidification of a synthetic resin material by a batch method (however, pulverization processing is not required when shrinking and solidifying into particles by quenching). This is performed by the rotating blade 18 rotating at a high speed, and “crushing (or cutting) → semi-melting →
A series of processing steps of “granular shrinkage solidification by quenching” or “crushing (or cutting) → semi-melting → shrinkage solidification by quenching → pulverization” is rapidly performed in a short time, and the synthetic resin material is crushed by the rotary blade 18 ( Cutting)-Semi-molten during high-speed stirring, and rapid quenching is performed from such a state, so that a more preferable granular synthetic resin material (a) is obtained in terms of specific surface area and particle shape. Further, the crushing (or cutting), the semi-solidification, and the crushing after the shrinkage and solidification are performed only by the action of the rotary blade 18, which is advantageous in terms of equipment costs and operation costs.

In the above method, the synthetic resin material can be shrunk and solidified in a granular form by appropriately selecting the crushing form of the synthetic resin (A), the state of charging the rotary blade, and the like. According to this method, the granular synthetic resin material (a) can be obtained as it is, while substantially shrinking and solidifying, without any pulverization treatment by the rotary blade after the shrinking and solidification. On the other hand, in the method in which part or all of the synthetic resin material is not shrunk and solidified in a granular form, the granular synthetic resin material (a)
Is obtained.

In the above method, the temperature at which the synthetic resin (A) is semi-moltened varies to some extent depending on the type and shape of the synthetic resin. C., about 128 ° C. for medium-low density polyethylene. Therefore, the temperature for semi-melting is appropriately selected according to the type, proportion, form, and the like of the synthetic resin material contained in the synthetic resins (A).

The granular synthetic resin material obtained as described above
(a) is sieved by the sieving device 3, and only those having a predetermined particle size or less (for example, −6 mm) are sent to the storage silo 9 through the path 19. In this configuration example, the path 19 is constituted by a pneumatic tube (10 in the figure is a blower), and is made of a granular synthetic resin material.
(a) is pneumatically delivered to the storage silo 9 (pneumatic transportation, the same applies hereinafter). On the other hand, the granular synthetic resin material exceeding the predetermined particle size is returned to the conveying line on the entrance side of the granular solidifying device 2 through a path 20 (pneumatic blower in the figure) as a pneumatic tube, and is solidified together with the synthetic resin (A). The device 2 is recharged. The position at which the coarse granular synthetic resin material is returned is arbitrary, for example,
It can be returned to each position (usually a transport line) such as between the granular solidifying device 2 and the magnetic separator 4 and the entry side of the crushing device 1, and in some cases, can be supplied to the processing line Y. When supplying to the processing line Y, for example, the inlet side of the primary crusher 5, between the primary crusher 5 and the secondary crusher 6, between the secondary crusher 6 and the separator 7, and between the separator 7 and the crusher It can be supplied to any position (usually a transfer line) such as between the devices 8. In addition, the coarse-grained synthetic resin material is taken out of the system and directly charged into other processes (for example, furnace top charging into a blast furnace or a scrap melting furnace, direct charging into a coke furnace or a sintering furnace). Or the like).

On the other hand, in the processing line Y, synthetic resins
(B) is roughly crushed in the primary crusher 5 (for example, a particle size of 50).
After being crushed to about 2 mm, it is charged into the secondary crusher 6 by conveyor conveyance or the like, and is crushed to a secondary size (for example, a particle size of 20 mm).
Crushed to the extent). The primary crushed synthetic resins
In (B), the magnetic waste 4 is removed by the magnetic separator 4 (a device that removes iron waste and the like by a magnet and removes it) during the conveyor conveyance.

The secondary crushed synthetic resin (B) is loaded into a sorting machine 7 by conveyor conveyance or the like, where metal, earth and sand,
Foreign matter such as stones is separated and removed by a method such as wind separation.
Next, it is sent to the crushing device 8 (tertiary crusher) through the path 21a, and crushed to a predetermined particle size or less (for example, -6 mm) to obtain the granular synthetic resin material (b). This granular synthetic resin material (b) is sent to the storage silo 9 through the path 21b. In this configuration example, the paths 21a and 21b are constituted by pneumatic pipes (10 is a blower in the figure), and the granular synthetic resin material (b) is pneumatically fed to the storage silo 9.

Granular synthetic resin material stored in storage silo 9
The mixture of (a) and (b) is conveyed or pneumatically conveyed to a pneumatic supply facility 11 composed of a blowing tank or the like, and is pneumatically fed to a furnace such as a blast furnace through the pneumatic supply facility 11, and the tuyere of the furnace Etc. and blown into the furnace. In the configuration example shown in FIG. 1, the magnetic separators 4 are provided at one position on each of the processing lines X and Y, but the magnetic separators 5 may be disposed at a plurality of positions on each processing line.

The crushing method of various crushing devices (including the crushing device 8) installed in the processing lines X and Y is arbitrary, and other than the crushing method using only ordinary mechanical means,
For example, a so-called freezing and crushing type in which an object to be processed is crushed in a frozen state can be applied. Usually, incidental facilities such as a yard drying facility for incoming synthetic resin are provided on the entrance side of the processing facility shown in FIG.

The amount of the synthetic resin (A) mainly composed of a film-like synthetic resin material and the amount of the other synthetic resin (B) supplied to the processing equipment is a certain amount over time due to the nature of waste. In some cases, variations may occur. In a relatively short period of time (for example, about several hours to several tens of hours), only one type of synthetic resin is supplied, and therefore, the resin is processed and pneumatically delivered to the furnace. The synthetic resin to be used is temporarily synthetic resin (A) -granular synthetic resin material (a) or synthetic resin.
(B)-It may be only one of the granular synthetic resin material (b). In addition, only one of the granular synthetic resin materials (a) and (b) may be temporarily supplied to the furnace for other reasons. Furthermore, granular synthetic resin material
(a) and (b) can be stored in separate silos or the like and can be pumped to the furnace through separate paths.

As described above, the granular synthetic resin material (a) obtained by the granular shrinkage-solidification or shrinkage-solidification-granulation by the above method is relatively porous, has a large specific surface area, and has an overall surface area. As shown in the figure, it has excellent combustion properties and fluidity due to having a rounded shape. By mixing these with the granular synthetic resin material (b), the whole granular synthetic resin material supplied to the furnace is Can effectively improve the flammability, fluidity, and transportability of the material. That is, regarding the flammability, when a mixture of the granular synthetic resin material (a) and the granular synthetic resin material (b) is blown into the furnace, the granular synthetic resin material (a) having good flammability rapidly burns. As a result, the granular synthetic resin material (b) is quickly ignited, thereby significantly increasing the flammability of the whole granular synthetic resin material blown into the furnace.

Further, with regard to the fluidity and transportability, the granular synthetic resin material (a) having a rounded shape and excellent in fluidity and transportability is included in the granular synthetic resin material, and this is It has a lubricating function to improve the fluidity of the entire resin material, and as a result, the fluidity and transportability of the whole granular synthetic resin material are greatly improved.

In order to obtain the above-mentioned effects, the granular synthetic resin material (a) and the granular synthetic resin material (b) are mixed in a weight ratio of (a) /
[(A) + (b)]: It is preferable to mix at a ratio of 0.10 or more. FIG. 5 shows the results obtained by pulverizing a granular synthetic resin material (a) having a particle size of 6 mm or less and a bulk synthetic resin material obtained by shrinkage-solidification-granulation treatment of a film-like synthetic resin material by the above method. A granular synthetic resin material (b) having a particle size of 6 mm or less (all the granular synthetic resin materials have an angle of repose of 40 °) was mixed at various ratios, and this mixture was fed to a tuyere of a blast furnace to be furnace Inlet blowing is performed, and the weight ratio of (a) / [(a) + (b)] is compared with the transportability (frequency of supply trouble occurrence) and combustibility (coke replacement rate by injected fuel) of the mixture. It examines the relationship. The supply trouble occurrence frequency and the coke replacement ratio were determined as follows.

(B) Frequency of supply trouble occurrence When only the granular synthetic resin material (b) (repose angle: 40 °) having a particle size of 6 mm or less obtained by pulverizing a massive synthetic resin material is supplied alone to the furnace. Supply trouble occurrence frequency index of "1"
The frequency of supply trouble occurrence compared to this case is indicated by an index. Whether there is a supply trouble or not is monitored by constantly monitoring the weight fluctuation of the granular synthetic resin material in the storage silo.
If the state of (1) lasts for a predetermined time (for example, about 10 minutes), it is determined that a trouble has occurred (clogging has occurred in the silo cutout portion or in the middle of the air supply pipe).

(B) Coke replacement rate Coke replacement rate = (Coke ratio reduced by blowing synthetic resin material) / (Blowing ratio of granular synthetic resin material) However, coke reduced by blowing synthetic granular resin material Ratio: kg / t · pig Injection ratio of granular synthetic resin material: kg / t · pig According to FIG. 5, (a) / [(a) + (b)]: excellent flammability in the region of 0.10 or more It can be seen that the transferability can be obtained.

As described above, in order to control (a) / [(a) + (b)] within a predetermined range, the granular synthetic resin material (a) and the granular synthetic resin material (b) are temporarily It is preferable to mix after storing in the storage silo. FIG. 4 shows an example of the configuration of a storage silo for that purpose, in which the granular synthetic resin material (a) and the granular synthetic resin material (b) are stored in respective primary storage silos 22, 23, and these primary storage silos 22,
The granular synthetic resin material (a) and the granular synthetic resin material (b) are appropriately cut out from 23 into a secondary storage silo 24 (corresponding to the storage silo 9 in FIG. 1), and the secondary storage silo 24 is provided with (a) / [(a ) + (B)]
The adjusted granular synthetic resin material is stored. In addition to the above configuration, for example, the primary storage silos 22, 23
Alternatively, the granular synthetic resin material (a) and the granular synthetic resin material (b) stored respectively may be directly mixed in a pneumatic piping system.

Further, the granular synthetic resin materials (a) and (b) are preferably processed to have a bulk density of 0.30 or more and a repose angle of 40 ° or less. As described above, in the prior art, it is proposed that the bulk density of the synthetic resin pulverized material is 0.35 or more. However, there is a problem that the load of the crushing blade is increased (the life of the crushing blade is shortened), and some crushers can only obtain a pulverized material having a bulk density of less than 0.35. On the other hand, according to the study of 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, the occurrence of 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 is the bulk density of granular synthetic resin materials. It has been found that there is almost no relation, and that the effect is greatly influenced by the grain shape of the granular synthetic resin material, and that 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. 6 shows the angle of repose of a granular synthetic resin material having a particle diameter of 6 mm or less obtained by pulverizing a massive synthetic resin material and the clogging in a bridge (shelf hanging) in a storage silo or a pneumatic tube. And the like, and the relationship with the supply trouble occurrence frequency is shown for each granular synthetic resin material having a different bulk density. The supply trouble occurrence frequency was evaluated in the same manner as in FIG. According to FIG. 6, it is understood 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.

Further, among the granular synthetic resin material (a),
It can be understood that a material obtained by granular shrinkage-solidification or shrinkage-solidification-granulation by the method described above can obtain a granular synthetic resin material having a repose angle of 40 ° or less simply by granulation shrinkage-solidification or shrinkage-solidification-granulation by the method. Was. On the other hand, the granular synthetic resin material (a) obtained by volume reduction solidification-granulation by the above method
Alternatively, for a granular synthetic resin material (a) obtained by shrinkage-solidification-granulation by a method other than the above or a granular synthetic resin material (B) obtained by crushing a synthetic resin (B), a repose angle of 40 The crushing method or the like is appropriately selected in order to achieve the following degree. The particle size of the granular synthetic resin materials (a) and (b) 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. The fuel injection method of the present invention can be applied to various furnaces such as a blast furnace and a rotary kiln.

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 and the like). Therefore, synthetic resins to which foreign substances (metals, paper, other inorganic substances and organic substances) other than the synthetic resin due to their properties are attached or mixed 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 parts, toys, stationery, toner, automotive parts (eg interior goods , Bumpers), shredder dust for automobiles and home appliances, etc.
Examples include ion exchange resin, synthetic paper, synthetic resin adhesive, synthetic resin paint, solidified fuel (reduced plastic waste).

Among the synthetic resins that are brought into the processing facility as waste, those that are already granular and can be directly supplied to the furnace by pneumatic supply (for example, granular ion-exchange resin materials, Needless to say, synthetic resin pellets for use, synthetic resin spheres for toys, etc.) can be supplied to a furnace by, for example, directly charging them into a storage silo without going through the processing according to the present invention.

[0049]

EXAMPLE 1 A synthetic resin (A) mainly composed of a film-shaped synthetic resin material was added to the processing / blowing equipment shown in the flow chart of FIG. 1 at a rate of 2.5 t / hr.
5t / h of synthetic resin (B) mainly composed of massive synthetic resin material
r in the form of a granular synthetic resin material (a) and
After processing into (b) and mixing them in a storage silo,
Air was sent to the blast furnace through a pneumatic pipe system, and was blown into the furnace from the tuyere with pulverized coal. The processing and supply conditions of the synthetic resin and the operating conditions of the blast furnace at this time are shown below.

(A) Synthetic resin processing conditions (A-1) Synthetic resin (A) After coarse crushing according to the flow chart of FIG. It was processed into a granular synthetic resin material (a) and transferred to a storage silo. (A-2) Synthetic resin (B) A granular synthetic resin material having a particle size of 6 mm or less by performing primary crushing, secondary crushing and pulverizing treatment in accordance with the flowchart of FIG.
It was processed into (b) and transferred to a storage silo.

(B) Pneumatic condition of granular synthetic resin material A mixture of the granular synthetic resin materials (a) and (b) charged in the storage silo is quantitatively cut out from the silo, and the mixture is fed to a pneumatic supply facility. The granular synthetic resin material was transferred from the pneumatic supply equipment to the tuyere part of the blast furnace under the following conditions, and was blown into the furnace. Pneumatic gas: air Pneumatic gas injection flow rate: 1300 Nm ³ / hr Blow amount of granular synthetic resin material: 7.5 t / hr Solid-gas ratio: 4.5 kg / kg

(C) Blast furnace operating conditions Tapping rate: 9000 t / day Coke ratio: 447 kg / t · pig Tuyere Injection rate of granular synthetic resin material: 20 kg / t · pig Pulverized coal injection rate: 100 kg / t · pig Blast volume: 7260 Nm ³ / min Oxygen enrichment rate: 4% Blast temperature: 1000 ° C. or more As a result of injecting the synthetic resin material in the furnace for 7 days, the blast furnace operation itself has no hindrance, and the granular There was almost no supply trouble such as clogging in the storage silo cutout section or the pneumatic piping system of the synthetic resin material.

Example 2 14.6 synthetic resin (A) mainly composed of a film-like synthetic resin material was used for the test equipment for processing and blowing synthetic resin shown in the flow chart of FIG.
kg / hr, synthetic resins mainly composed of massive synthetic resin material
(B) was supplied at a rate of 29.2 kg / hr, processed into granular synthetic resin materials (a) and (b), mixed with a storage silo, and then subjected to a scrap melting test through a pneumatic pipe system. The air was sent to the furnace (vertical furnace) and was blown into the furnace from the tuyere together with pulverized coal. In this embodiment, a scrap melting test furnace (internal volume: 2.5 m ³ , pig iron production: 10 t / day) having a combustion burner having a structure shown in FIG. 8 at a plurality of tuyeres of the furnace body shown in FIG. Using. In the test furnace shown in FIGS. 7 and 8, 25 is a furnace top, 26 is a raw material charging device, 27 is a furnace top opening / closing device, 28 is an exhaust gas duct, 29 is a tuyere, and 30 is a tuyere. From the tuyere combustion burner 30, the pulverized coal PC and the granular synthetic resin material SR from the solid fuel injection part a at or near the center of the burner radial direction, and the surrounding oxygen injection part b. Oxygen at normal temperature was blown into the furnace, and simultaneously steam was blown as a coolant for adjusting the combustion temperature.

The processing and supply conditions of the synthetic resins and the operating conditions of the scrap melting test furnace are shown below. (A) Processing conditions for synthetic resins Same as in Example 1. (B) Pneumatic conditions for granular synthetic resin materials. Quantitative determination of a mixture of granular synthetic resin materials (a) and (b) charged in a storage silo from silos The granular synthetic resin material was pneumatically cut, transferred to a pneumatic supply facility, and pneumatically fed into the blast furnace tuyere under the following conditions from the pneumatic supply facility and blown into the furnace. Pneumatic gas: air Pneumatic gas injection flow rate: 7.6 Nm ³ / hr Injection rate of granular synthetic resin material: 43.8 kg / hr Solid-gas ratio: 4.5 kg / kg

(C) Operating conditions of the test furnace for scrap melting Tapping rate: 10 t / day Coke ratio: 265 kg / t · pig Converter slag ratio: 121 kg / t · pig Silica ratio: 5 kg / t · pig Tuyere Granular Injection amount of synthetic resin material: 105 kg / t • pig Injection amount of pulverized coal: 175 kg / t • pig Blast oxygen amount: 206 Nm ³ / t • pig Vapor amount: 7 Nm ³ / t • pig Furnace of granular synthetic resin material of not less than 7 Nm ³ / t • pig As a result of the 7 days of internal blowing, the operation of the scrap melting test furnace itself was not hindered at all, and supply troubles such as clogging in the storage silo cutout part of the granular synthetic resin material and the pneumatic piping system were also observed. Almost never occurred.

[Example 3] Film-like synthetic wood was applied to the synthetic resin processing / blowing equipment shown in the flow chart of FIG. 1 under the conditions of operating examples 1 to 10 shown in Tables 1, 3 and 5. (A) and synthetic resin (B) mainly composed of massive synthetic wood were supplied and processed into granular synthetic resin materials (a) and (b), respectively. As shown in Table 1, Table 3 and Table 5, in addition to thermoplastic resins such as polyethylene and polypropylene, polyethylene terephthalate (PET), ABS
Resin, vinyl chloride resin (PVC), and as other resins, thermosetting resins such as urethane resin and phenol resin, plasticizers such as diethyl phthalate, trimethyl phosphate, 2,3-dibrumopropyl, etc. , A resin to which glass fiber, calcium carbonate, alumina, clay and the like are added, and other various additives. In addition, soil and the like adhered to synthetic resins were included as inorganic substances. The processing conditions for synthetic resins are shown in Example 1.
Is the same as

Granular synthetic resin material (a) and (b) after processing
Is mixed in the storage silo, and then pneumatically supplied to the tuyere of the blast furnace through a pneumatic piping system, and a waste plastic blowing lance (25
mmφ) into the furnace. The pneumatic feeding conditions of the granular synthetic resin material are shown below. Tables 1, 3 and 5 show properties and the like of the synthetic resin supplied in the processing and the furnace in each of the operation examples 1 to 10. Pneumatic gas: air Pneumatic gas blowing flow rate: 650 to 2600 Nm ³ / hr Blowing rate of granular synthetic resin material: 3.75 to 15.0 t / h
r solid-gas ratio: 4.5 kg / kg

Operating Examples 1-4 Synthetic resins mainly composed of film-like synthetic wood under the conditions shown in Table 1 for equipment for treating and blowing synthetic resins
(A) is supplied at a rate of 2.5 t / hr and synthetic resin (B) mainly composed of massive synthetic wood is supplied at a rate of 5.0 t / hr, and processed into granular synthetic resin materials (a) and (b). After treating and mixing these in a storage silo, the mixture was fed into a blast furnace and blown into the furnace (pneumatic gas blowing flow rate: 1300 Nm ³ / hr). Table 2 shows the operating conditions of the blast furnace. As a result of injecting the granular synthetic resin material into the furnace for 7 days, the operation of the blast furnace itself was not hindered at all, and the granular synthetic resin material was clogged in the storage silo cut-out portion or the air supply pipe system. There was almost no supply trouble.

Operating Example 5 Synthetic resins mainly composed of film-like synthetic wood under the conditions shown in Table 3 for the equipment for processing and blowing synthetic resins
(A) is supplied at a rate of 1.5 t / hr and synthetic resin (B) mainly composed of massive synthetic wood is supplied at a rate of 6.0 t / hr, and processed into granular synthetic resin materials (a) and (b). After treating and mixing these in a storage silo, the mixture was fed into a blast furnace and blown into the furnace (pneumatic gas blowing flow rate: 1300 Nm ³ / hr). Table 4 shows the operating conditions of the blast furnace. As a result of injecting the granular synthetic resin material into the furnace for 7 days, the operation of the blast furnace itself was not hindered at all, and the granular synthetic resin material was clogged in the storage silo cut-out portion or the air supply pipe system. There was almost no supply trouble.

Operation Example 6 Synthetic resins mainly composed of film-like synthetic wood under the conditions shown in Table 3 for equipment for treating and blowing synthetic resins
(A) is supplied at a rate of 3.0 t / hr, and synthetic resin (B) mainly composed of massive synthetic wood is supplied at a rate of 4.5 t / hr.
Granular synthetic resin materials (a) and (b) were processed and mixed in a storage silo, and then fed into a blast furnace and blown into the furnace (pneumatic gas blowing flow rate: 1300 Nm ³ / hr). Table 4 shows the operating conditions of the blast furnace. As a result of injecting the granular synthetic resin material into the furnace for 7 days, the operation of the blast furnace itself was not hindered at all, and the granular synthetic resin material was clogged in the storage silo cut-out portion or the air supply pipe system. There was almost no supply trouble.

Operation Example 7 Synthetic resins mainly composed of film-like synthetic wood under the conditions shown in Table 3 for equipment for treating and blowing synthetic resins
(A) is supplied at a rate of 5.0 t / hr, and synthetic resin (B) mainly composed of massive synthetic wood is supplied at a rate of 2.5 t / hr, and processed into granular synthetic resin materials (a) and (b). After treating and mixing these in a storage silo, the mixture was fed into a blast furnace and blown into the furnace (pneumatic gas blowing flow rate: 1300 Nm ³ / hr). Table 4 shows the operating conditions of the blast furnace. As a result of injecting the granular synthetic resin material into the furnace for 7 days, the operation of the blast furnace itself was not hindered at all, and the granular synthetic resin material was clogged in the storage silo cut-out portion or the air supply pipe system. There was almost no supply trouble.

Operation Example 8 Synthetic resins mainly composed of film-like synthetic wood under the conditions shown in Table 5 for equipment for processing and blowing synthetic resins
(A) is supplied at a rate of 1.50 t / hr and synthetic resin (B) mainly composed of massive synthetic wood is supplied at a rate of 2.25 t / hr to be processed into granular synthetic resin materials (a) and (b). After being treated and mixed in a storage silo, the mixture was fed into a blast furnace and blown into the furnace (pneumatic gas blowing flow rate: 650 Nm ³ / hr).
Table 6 shows the operating conditions of the blast furnace. As a result of injecting the granular synthetic resin material into the furnace for 7 days, the operation of the blast furnace itself was not hindered at all, and the granular synthetic resin material was clogged in the storage silo cut-out portion or the air supply pipe system. There was almost no supply trouble.

Operating Example 9 Synthetic resins mainly composed of film-like synthetic wood under the conditions shown in Table 5 for equipment for processing and blowing synthetic resins
(A) was supplied at a rate of 4.50 t / hr and synthetic resin (B) mainly composed of massive synthetic wood was supplied at a rate of 6.75 t / hr, and processed into granular synthetic resin materials (a) and (b). After being treated and mixed in a storage silo, the mixture was pneumatically blown into a blast furnace and blown into the furnace (pneumatic gas blowing flow rate: 1930 Nm ³ / h)
r). Table 6 shows the operating conditions of the blast furnace. As a result of injecting the granular synthetic resin material into the furnace for 7 days, the operation of the blast furnace itself was not hindered at all, and the granular synthetic resin material was clogged in the storage silo cut-out portion or the air supply pipe system. There was almost no supply trouble.

Operating Example 10 Synthetic resins mainly composed of film-like synthetic wood under the conditions shown in Table 5 for equipment for treating and blowing synthetic resins
(A) is supplied at a rate of 5.5 t / hr and synthetic resin (B) mainly composed of massive synthetic wood is supplied at a rate of 9.5 t / hr, and processed into granular synthetic resin materials (a) and (b). After being treated and mixed in a storage silo, the mixture was fed into a blast furnace and blown into the furnace (pneumatic gas blowing flow rate: 2600 Nm ³ / hr). Table 6 shows the operating conditions of the blast furnace. As a result of injecting the granular synthetic resin material into the furnace for 7 days, the operation of the blast furnace itself was not hindered at all, and the granular synthetic resin material was clogged in the storage silo cut-out portion or the air supply pipe system. There was almost no supply trouble.

[0065]

[Table 1]

[0066]

[Table 2]

[0067]

[Table 3]

[0068]

[Table 4]

[0069]

[Table 5]

[0070]

[Table 6]

[Embodiment 4] Magnetic cards discarded as defective or used (including cards using paper or the like as a mating material, cards incorporating an IC as a storage medium, etc.) are shown in FIG. Processing of synthetic resins shown in the flowchart
After supplying to the blowing equipment and processing, the air was supplied to the blast furnace and blown into the furnace. Magnetic cards are used for a variety of purposes.
They can be broadly classified into types. (1) Thickness 0.5mm or more: cash cards, various certification cards, etc. (2) Thickness less than 0.5mm: telephone cards, tickets,
Tickets, various prepaid cards, etc.

As a result of investigation by a preliminary test and the like, as for the above magnetic cards, if the cards having a thickness of less than 0.5 mm are simply crushed, they will become small scale-like flakes, and will be added in a tank of a pneumatic pipe system. It has been found that when pressed, the small and thin pieces come into close contact with each other and voids are eliminated, so that slippage between the crushed pieces is eliminated and aeration is also deteriorated, thereby easily causing a supply trouble such as hanging on a shelf. Therefore, in this embodiment, the cards of the above (2) having a thickness of less than 0.5 mm are used as synthetic resins (A) mainly composed of a film-like synthetic wood, and the (1) having a thickness of 0.5 mm or more is used. Are separated as synthetic resins (B) mainly composed of massive synthetic wood, and
In the equipment for processing and blowing synthetic resins shown in the flow chart of (1), each was processed into granular synthetic resin materials (a) and (b). Granular synthetic resin material (a) after processing and
After mixing (b) in the storage silo, the mixture was pneumatically supplied to the tuyere of the blast furnace through a pneumatic piping system, and was blown into the furnace through a waste plastic blowing lance (25 mmφ).

The processing and pneumatic conditions of the synthetic resin and the operating conditions of the blast furnace are shown below. (A) Processing conditions for synthetic resins Same as in Example 1. (B) Pneumatic conditions for granular synthetic resin materials. Quantitative determination of a mixture of granular synthetic resin materials (a) and (b) charged in a storage silo from silos The granular synthetic resin material was pneumatically cut, transferred to a pneumatic supply facility, and pneumatically fed into the blast furnace tuyere under the following conditions from the pneumatic supply facility and blown into the furnace. Pneumatic gas: air Pneumatic gas blowing amount: 1200 Nm ³ / hr Blowing amount of granular synthetic resin material: 62.5 kg / min Solid-gas ratio: 2.4 kg / kg

(C) Operating conditions of the blast furnace Production rate: 9000 t / day Blast rate: 7260 Nm ³ / min Oxygen enrichment rate: 4% Blast temperature: 1200 ° C. Coke ratio: 447 kg / t · pig Pulverized coal injection rate: 100 kg / t · pig Injection rate of granular synthetic resin material: 10 kg / t · pig Injection of granular synthetic resin material in the furnace was carried out for 2 days. There was almost no supply trouble such as clogging in the storage silo cutout section or the pneumatic piping system of the synthetic resin material.

Example 5 Only polyethylene terephthalate resin (PET) bottle containers were selected from plastic bottle containers collected as waste, processed, processed, pneumatically supplied to a blast furnace, and blown into the furnace. . Sorting of PET bottles is performed using a commercially available material discriminator (TOA Dempa Kogyo Co., Ltd.)
Manufactured) or manually. In operation example 1, PET
The bottle is supplied only to the processing line Y of the synthetic resin processing / blowing equipment shown in the flow chart of FIG. 1, and the bottle is entirely crushed to a particle size of 6 mm or less with the cap or label attached (however, the metal cap Was removed by a magnetic separator after crushing), and supplied to the blast furnace by air and blown into the furnace.

In the operation example 2, the PET bottle is supplied only to the processing line X of the equipment for processing and blowing synthetic resin shown in the flow chart of FIG. 1, and the particle size of 6 mm or less with the cap or label attached. (However, the metal cap was removed by a magnetic separator after coarse crushing), and supplied to the blast furnace by air and blown into the furnace. The processing and pneumatic feeding conditions of the synthetic resins and the blast furnace operating conditions of Operation Example 1 and Operation Example 2 are shown below. (A) Processing conditions for synthetic resins Operation example 1: Same as (A-2) in Example 1. Operation example 2: Same as (A-1) in Example 1.

(B) Pneumatic condition of granular synthetic resin material In each of Operation Example 1 and Operation Example 2, the granular synthetic resin material charged in the storage silo is quantitatively cut out from the silo, and is cut out to the pneumatic supply facility. The granular synthetic resin material was transferred from the pneumatic supply equipment to the tuyere part of the blast furnace under the following conditions, and was blown into the furnace. Pneumatic gas: air Pneumatic gas injection amount: 1200 Nm ³ / hr Injection amount of granular synthetic resin material: 62.5 kg / min Solid-gas ratio: 2.4 kg / kg (c) Operating conditions of blast furnace 9000t / day Blowing rate: 7260Nm ³ / min Oxygen enrichment rate: 4% Blasting temperature: 1200 ° C Coke ratio: 447kg / t · pig Pulverized coal blowing rate: 100kg / t · pig Blowing rate of granular synthetic resin material: 10kg / t ・ pig

As a result of performing the above operation for two days, in the operation example 1, the amount of the granular synthetic resin injected into the blast furnace was not stabilized (the amount of the injection pulsated), and the granular synthetic resin was injected into the furnace. The injection stop time of the material reached an average of 4.6 hr / day. As a result of the investigation, it was found that this instability of the blowing amount was caused by poor cutting of the granular synthetic resin material from inside the tank in the pneumatic piping system. When pressed, crushed pieces of granular synthetic resin material (scale-shaped small flakes) adhere to each other, eliminating voids, eliminating slippage between the crushed pieces and deteriorating aeration. It turned out that supply trouble occurred. On the other hand, in the operation example 2, the supply trouble of the granular synthetic resin material as in the operation example 1 did not occur at all, and no trouble occurred in the operation of the blast furnace at all.

[0079]

According to the method of processing synthetic resin into furnace fuel and the method of injecting fuel into the furnace according to the present invention, the synthetic resin such as plastic is melted in a blast furnace or scrap regardless of its form. It can be processed into pneumatic and blowing fuel for furnaces, etc., and can also be supplied to the furnace as blowing fuel, thereby enabling large-scale processing and effective use of synthetic resin as waste. Further, the fuel cost of a furnace such as a blast furnace can be significantly reduced. Furthermore, the fluidity, transportability and flammability of the synthetic resin supplied to the furnace can be effectively improved, and the synthetic resin material can be used in a blast furnace or a scrap melting furnace without disturbing the operation of the furnace. Can be appropriately supplied into the furnace.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an example of a fuel injection method of the present invention.

FIG. 2 is an explanatory view showing one configuration example of a method for shrinkage-solidification-granulation of synthetic resins (A).

FIG. 3 is an explanatory view schematically showing the principle of another method for shrinkage-solidification-granulation of synthetic resins (A).

FIG. 4 is an explanatory view showing another configuration example of the storage method of the granular synthetic resin material in the flowchart of FIG.

FIG. 5 shows a granular synthetic resin material (a) obtained by shrinking and solidifying and granulating a film-like synthetic resin material by a specific method, and a granular synthetic resin material (b) obtained by pulverizing a bulk synthetic resin material. Graph showing the relationship between the mixing ratio of water and the coke replacement ratio and the frequency of supply trouble occurrence

FIG. 6 is a graph showing the relationship between the angle of repose and the supply trouble occurrence frequency of granular synthetic resin materials obtained by pulverizing a bulk synthetic resin material, for each granular synthetic resin material having a different bulk density.

FIG. 7 is an explanatory view showing the structure of a test furnace for melting scrap used in Examples.

FIG. 8 is an explanatory view showing the structure of a combustion burner provided at the tuyere of the test furnace for melting scrap shown in FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Crusher, 2 ... Granular solidification apparatus, 3 ... Sieving apparatus, 4 ... Magnetic separator, 5 ... Primary crusher, 6 ... Secondary crusher, 7 ... Sorter,
8 crusher, 9 storage silo, 10 blower, 11
Pneumatic feeding equipment, 12: crusher, 13: solidification device,
14: crusher, 15: heating chamber, 16: cooling chamber, 17 ...
Transfer device, 18 ... Rotary blade, 19, 20, 21a, 21b
... Route, 22, 23, 24 ... Storage silo, 25 ... Furnace top, 26 ... Raw material charging device, 27 ... Opening and closing device, 28 ... Exhaust gas duct, 29 ... Tuyere, 30 ... Combustion burner, X, Y ...
Processing line

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C21C 5/52 C21C 5/52 4K070 C22B 7/00 C22B 7/00 F 9/20 9/20 (72) Inventor Masuhiro Fujii 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Inventor Atsushi Yamaguchi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Nihon Kokan Co., Ltd. (72) Inventor Minoru Asanuma 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. F-term (reference) 4F301 AA13 AA14 AA15 AA17 AA21 AA22 AA25 AA29 AD10 BD05 BD12 BD37 BD42 BD43 BD50 BF15 BF17 BF26 BF27 BF21 BG31 BG40 BG47 BG48 BG53 BG57 4H015 AA02 AA17 AB01 BA12 BB02 BB03 BB10 CA03 CB01 4K001 BA22 BA23 BA24 DA05 FA10 GA01 GA02 GA06 GA16 4K012 BE01 CB00 CB05 DC08 4K014 CB00 CC00 CD1 8 4K070 AB01 AB20 AC34 AC36 DA01 DA09 EA11 EA14 EA16

Claims (8)

[Claims] 1. A method for processing synthetic resins into furnace fuel for pneumatic feeding and blowing in processing equipment, wherein synthetic resins mainly composed of a film-like synthetic resin material are melted by heat. Alternatively, by solidifying after semi-melting, the volume is solidified, the bulk density is 0.30 or more, and the angle of repose is 40.
A method for processing synthetic resin into furnace fuel, characterized by processing into a granular synthetic resin material of less than or equal to °. 2. The step of processing synthetic resins mainly composed of a film-like synthetic resin material into a granular synthetic resin material comprises, at least, a step of heating and melting the synthetic resin, and then cooling and solidifying the synthetic resin. 2. A method for processing synthetic resin into furnace fuel according to claim 1, comprising a step of cutting or pulverizing the solidified synthetic resin material to obtain a granular synthetic resin material. 3. A method for processing synthetic resins into furnace fuel for pneumatic blowing and blowing in processing equipment, wherein the synthetic resins mainly composed of massive synthetic resin material are pulverized. A synthetic resin material having a bulk density of 0.30 or more and a repose angle of 40 ° or less. 4. The method according to claim 1, wherein the particle size of the granular synthetic resin material obtained by the processing is 4 to 10 mm.
4. A method for processing synthetic resin into furnace fuel according to 2 or 3. 5. A method for processing synthetic resin in a processing equipment, pneumatically supplying the same as a fuel to a furnace and blowing it into the furnace, wherein the synthetic resin mainly composed of a film-like synthetic resin material is By solidifying after melting or semi-melting by heat, the volume is reduced and solidified, the bulk density is 0.30 or more, and the angle of repose is 40.
A method of injecting fuel into a furnace, comprising: a step of processing into a granular synthetic resin material having a temperature of not more than 0 ° C .; 6. The step of processing a synthetic resin mainly composed of a film-like synthetic resin material into a granular synthetic resin material includes at least a step of heating and melting the synthetic resin, and then cooling and solidifying the synthetic resin. 6. A method for injecting fuel into a furnace according to claim 5, comprising a step of cutting or pulverizing the solidified synthetic resin material to obtain a granular synthetic resin material. 7. A method for processing synthetic resin in a processing equipment, pneumatically supplying the same as a fuel to a furnace, and blowing the same into the furnace, wherein the synthetic resin mainly composed of massive synthetic resin material is pulverized. A process of processing into a granular synthetic resin material having a bulk density of 0.30 or more and a repose angle of 40 ° or less, and a step of pneumatically feeding the granular synthetic resin material into a furnace and blowing it into the furnace. How to inject fuel into the furnace. 8. The method according to claim 5, wherein the particle size of the granular synthetic resin material obtained by the processing is 4 to 10 mm.
8. The method for injecting fuel into a furnace according to 6 or 7.