JP5568843B2 - Method for producing solid raw fuel - Google Patents

Description

  The present invention relates to a solid raw fuel manufacturing method for manufacturing solid raw fuel used for combustion from waste plastic contained in waste such as municipal waste and industrial waste.

  Waste plastics and other wastes are appropriately treated by dechlorinating and decomposing them by heating in a pyrolysis furnace, simply by applying heat, fusing to the furnace wall of the pyrolysis furnace or agglomerating each other. Since a problem that it cannot be performed occurs, various measures are taken to prevent this problem.

  Among such measures, for example, a method disclosed in Patent Document 1 is known as a method of treating waste by heating and dechlorinating and decomposing waste containing a chlorine compound such as vinyl chloride. Yes. In this treatment method, first, waste is subjected to a dechlorination reaction in a dechlorination cracking furnace to remove chlorine. Waste after dechlorination is led to the main combustion (complete combustion) / melting furnace, and it is completely burned by the oxygen-enriched air from the oxygen supply equipment, and the incombustible material is melted and discharged as molten slag to the molten slag recovery device The

The combustion exhaust gas from the main combustion / melting furnace is completely burned in the recombustion chamber. On the other hand, the exhaust gas exiting from the dechlorination cracking furnace is sent to the pyrolysis exhaust gas cleaning device. Further, the molten slag is made into sandy slag having a constant particle size by a molten slag classifier and added to the waste supplied to the dechlorination cracking furnace to prevent fusion between the cracking furnace inner wall and the resins. Thereby, it is said that generation | occurrence | production of harmful substances, such as a dioxin, can be suppressed and it can reduce that the resin contained in a waste material fuse | fuses to a combustion furnace inner wall.
JP-A-8-278015

  However, there has been a demand for the development of a method capable of producing a solid raw fuel by processing a large amount of the waste in a stable manner even when the waste having a complicated property or shape is used. Further, it is convenient if the solid raw fuel can be produced stably even in a state where the supply amount of sandy slag is not sufficient.

  This invention is made | formed in view of such a point, and it aims at providing the manufacturing method of the solid raw fuel which can manufacture a solid raw fuel efficiently from waste plastics by a simple method.

As a result of earnest examination of various conditions for carbonizing and desalting waste plastics, the inventor has surprisingly found that the particle size of the solid raw fuel produced by a simple method can be reduced, and completed the present invention. .
That is, the present invention relates to a solid raw fuel manufacturing method for manufacturing a solid raw fuel used for combustion from waste plastic using a heating furnace, in which the waste plastic is fused to the furnace wall of the heating furnace and the waste plastic is agglomerated. The anti-fusing material is supplied to the heating furnace together with the waste plastic, and the anti-fusing material is dust or pulverized coal accompanying the combustion gas after burning the organic matter under a pressure lower than atmospheric pressure. A method for producing a solid raw fuel, wherein the waste plastic is heated and pyrolyzed.
As another invention, in a method for producing a solid raw fuel used for combustion from waste plastic using a heating furnace, the waste plastic is fused to the furnace wall of the heating furnace and the waste plastic is used. An anti-fusing material that prevents agglomeration of coal is supplied to a heating furnace together with waste plastic, and the anti-fusing material is dust or pulverized coal accompanying the combustion gas after burning organic matter, and supplies oxygen-containing gas A method for producing a solid raw fuel, characterized in that waste plastic is heated and pyrolyzed.
Furthermore, as another invention, in a method for producing a solid raw fuel used for combustion from waste plastic using a heating furnace, the waste plastic is fused to the furnace wall of the heating furnace and the waste plastic is used. An anti-fusing material that prevents agglomeration of coal is supplied to a heating furnace together with waste plastic, and the anti-fusing material is dust or pulverized coal accompanying the combustion gas after burning organic matter, and is lower than atmospheric pressure A method for producing a solid raw fuel, wherein the waste plastic is heated and pyrolyzed while supplying an oxygen-containing gas under pressure.
The dust is preferably partial combustion slag.
Further, the present invention is a waste plastic processing method in which the generated solid raw fuel is supplied to a cement manufacturing apparatus or a power generation boiler and burned.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to manufacture a solid raw fuel efficiently, preventing fusion | melting of the waste plastic to the furnace wall of a heating furnace, and agglomeration of waste plastics. Moreover, a solid raw fuel with a small particle diameter can be obtained. As a result, the subsequent pulverization is facilitated, and transportation and combustion to a cement manufacturing apparatus or a power generation boiler can be facilitated.

  Hereinafter, a method for producing a solid raw fuel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram for explaining main processes of waste treatment including a method for producing a solid raw fuel according to an embodiment of the present invention. FIG. 2 is a block diagram showing an example of a method for producing the solid raw fuel. In addition, although manufacturing a solid raw fuel from the waste plastic containing a chlorine compound is demonstrated here, it is not restricted to this.

  As shown in FIG. 1, the waste plastic treatment includes, for example, a pretreatment process 100, a thermal decomposition process 200, and a posttreatment process 300. The pretreatment process 100 includes a process of collecting and transporting the waste plastic from the stock yard, crushing it to a size that is easy to process, and further transporting it to a facility for performing a thermal decomposition process.

  In the thermal decomposition process 200, the transported waste plastic is heated to perform a thermal decomposition reaction, and the waste plastic is reduced in volume, desalted and granulated, and after cooling the product, the solid raw fuel is separated and recovered. The process of carrying out is included. The post-processing step 300 includes a step of processing a gas generated by thermal decomposition.

  Next, the waste plastic processing by the above steps 100 to 300 will be described according to the actual flow.

As shown in FIG. 2, the waste plastic 10 is conveyed from a stock yard to a crusher 12 by a conveyor 11 such as a forklift, and is crushed to a predetermined size. The crushed crushed material is transferred to the heating furnace 20 by the transfer device 13. In the furnace of the heating furnace 20, dust or pulverized coal accompanying the combustion gas after burning the organic substance as the anti-fusing material is supplied. This anti-fusing material is introduced in order to prevent agglomeration of waste plastics in the furnace of the heating furnace 20 and occurrence of fusion of waste plastics to the furnace wall.
The organic substance used in the present invention refers to fossil fuels such as coal, heavy oil, crude oil and petroleum coke, and combustible waste such as the waste plastic 10 described above. The combustion includes partial combustion and complete combustion. Furthermore, dust refers to a solid accompanying the combustion gas generated by partial or complete combustion of organic matter.
Specific examples of the dust accompanying the combustion gas after burning the organic matter may be at least one of partial combustion slag, unburned petroleum coke, fly ash and heavy oil ash. Among these, the partial combustion slag is preferably used.

  In addition, the partial combustion slag used in the present invention is, for example, partial combustion of coal, waste plastic, or petroleum coke at an oxygen ratio of less than 0.8 and at a temperature of 1,200 ° C. to 1,600 ° C. to produce hydrogen or carbon monoxide. This refers to the solid content after solid-liquid separation is performed after the generated partial combustion gas containing dust is washed (with water) after obtaining (generated).

The average particle size of the partially burned slag is 5 to 100 μm, and the chemical composition is 40 to 80% by weight of carbon, 0 to 5% by weight of hydrogen, 0 to 5% by weight of oxygen, and 0 to 5% by weight of nitrogen. %, Ash content is 20 to 60% by weight. The components in the ash are, for example, 20 to 40% by weight of silicon dioxide, 5 to 30% by weight of aluminum oxide, 10 to 30% by weight of calcium oxide, and 0 to 10% by weight of iron oxide (Fe ₂ O ₃ ). Magnesium oxide is 0 to 10% by weight, titanium oxide is 0 to 10% by weight, and other components.

  Moreover, the unburned substance of petroleum coke used in the present invention refers to ash containing unburned substance after the combustion exhaust gas generated after burning petroleum coke is collected by a dust collector. An example of the combustion device is a boiler. The average particle diameter of the unburned petroleum coke is 30 to 100 μm, and the chemical composition is, for example, 85 to 100% by weight of carbon, 0 to 5% by weight of hydrogen, 0 to 5% by weight of oxygen, and nitrogen. 0 to 5% by weight, sulfur is 0 to 5% by weight, and ash content is 0 to 5% by weight.

Further, the fly ash used in the present invention refers to ash after dust collected from combustion exhaust gas generated after burning pulverized coal. Examples of the combustion device include a pulverized coal burning boiler. The fly ash has an average particle size of 5 μm to 20 μm, and has a chemical composition of, for example, 0 to 10% by weight of carbon and 90 to 100% by weight of ash. The components in the ash are 50 to 70% by weight of silicon dioxide, 20 to 30% by weight of aluminum oxide, 0 to 10% by weight of iron oxide (Fe ₂ O ₃ ), 0 to 5% by weight of magnesium oxide, Titanium oxide is 0 to 5% by weight, and other components.

  Moreover, the heavy oil ash in this invention means the ash containing the unburned substance after collecting the combustion exhaust gas generated after burning heavy oil or crude oil with a dust collector. Examples of the combustion apparatus include heavy oil or crude oil fired boilers. The average particle size of the heavy oil ash is 10 μm to 100 μm, and the chemical composition is, for example, 40 to 80% by weight of carbon, 0 to 5% by weight of hydrogen, 0 to 30% by weight of oxygen, and 0 to 10% by weight of nitrogen. %, Sulfur is 0 to 10% by weight, and ash is 0 to 10% by weight.

  Moreover, the pulverized coal used in the present invention refers to pulverized coal. The type of coal is not particularly limited as long as the effects of the present invention are not hindered, but a coal that does not substantially contain components that volatilize at 300 ° C., such as bituminous coal and anthracite coal, is preferable. The particle size is 200 μm or less, preferably 10 to 100 μm, but even finer is not a problem. The anhydrous carbon content is preferably 60% or more. If the coal has a lot of water, it can be dried in advance.

Heating the waste plastic and the anti-fusing material so that the anti-fusing material is 50 to 200 parts by weight, preferably 65 to 100 parts by weight, particularly preferably 80 to 100 parts by weight with respect to 100 parts by weight of the waste plastic. It is supplied to the furnace 20 for heating and pyrolysis. The waste plastic can be supplied to the heating furnace 20 after being mixed with the anti-fusing material in advance.

  Here, the waste plastic 10 used in the present invention may be one containing at least one kind of plastic such as polyethylene (PE), polypropylene (PP), polystyrene (PS), vinyl chloride (PVC), polyamide (PA). In addition, waste other than plastic may be contained. If there is much moisture adhering to the waste plastic, it can be dried and used in advance.

In the present invention, the inside of the heating furnace is under a pressure lower than the atmospheric pressure, and the waste plastic is heated and pyrolyzed. Thereby, compared with a case where the pressure is unexpectedly higher than the atmospheric pressure. The particle size of the solid raw fuel can be reduced. The pressure lower than the atmospheric pressure is 98.4 kPaA (738 Torr) to 101.3 kPaA (760 Torr) (A indicates an absolute pressure), preferably 99.4 kPaA (745 Torr) to 100.8 kPaA (756 Torr).

  In the present invention, instead of placing the inside of the heating furnace described above under a pressure lower than atmospheric pressure, waste plastic can be heated and pyrolyzed while supplying an oxygen-containing gas into the heating furnace. . Thereby, fusion of waste plastic to the furnace wall of the heating furnace and agglomeration of waste plastics can be prevented, and at the same time, a solid raw fuel having a small particle diameter can be obtained. An example of the oxygen-containing gas is air. The amount of air supplied to the heating furnace 20 is less than 1.0, preferably 0.2 or less, of the air ratio of pyrolysis gas containing tar generated in the heating furnace. The air ratio here refers to the ratio of the supply air amount to the theoretical air amount.

  In the present invention, the waste plastic can be heated and thermally decomposed while supplying an oxygen-containing gas under a pressure lower than the atmospheric pressure described above.

  The heating furnace 20 is constituted by a rotary heating furnace, for example, an indirect heating rotary kiln type heating furnace, and can perform thermal decomposition by heating a processed product in which a crushed material and an anti-fusing material are mixed. The heating temperature in the heating furnace 20 is 250 ° C to 500 ° C, preferably 250 ° C to 450 ° C, more preferably 280 ° C to 400 ° C, and particularly preferably 300 ° C to 350 ° C. The heating time in the heating furnace 20 is 30 minutes to 120 minutes, preferably 45 minutes to 90 minutes.

  In addition, as shown in FIGS. 3A to 3D, a lifter 30 extending along the axial direction of the furnace is preferably provided inside the rotary kiln-type heating furnace 20. By providing the lifter 30, it becomes possible to smoothly perform the stirring and mixing of the processed product obtained by mixing the crushed material put into the heating furnace 20 and the anti-fusing material. The number of lifters 30 to be installed is set as appropriate depending on the scale of the apparatus. For example, if the inner diameter of the heating furnace 20 is about 50 mm to 300 mm, two to four sheets as shown in FIGS. 3A to 3C are preferable, and if the inner diameter of the heating furnace 20 is about 600 mm, Eight sheets as shown in 3 (d) are preferable. Usually, it is attached at a pitch of about 0.3 to 3 times the height of the lifter. The height (h) of the lifter 30 is preferably about 10% to 30% of the inner diameter of the heating furnace 20 until the waste plastic is softened and reduced in volume.

In the present invention, waste plastic containing chlorine such as vinyl chloride, which is difficult to process, can be easily processed. That is, when the waste plastic is a waste plastic containing chlorine such as vinyl chloride, the chlorine content becomes gaseous by heating and is removed (desalted) from the solid raw fuel. This makes it possible to obtain a solid raw fuel with a low chlorine content. However, if the chlorine content in the waste plastic is large, chlorine content remains in the produced solid raw fuel, which may adversely affect the cement production equipment, cement product quality, and power generation boiler. Therefore, it is preferable that the waste plastic contains less chlorine. For example, in the present invention, the chlorine content in the waste plastic is 30% by weight or less, preferably 1 to 10% by weight or less.
The granulated solid raw fuel is discharged from the heating furnace 20 together with the remaining anti-fusing material and foreign matters, cooled by a cooling device (not shown), and transferred to a subsequent collection / separation device.

  The product discharged from the heating furnace 20 via the cooling device is supplied as it is before or after pulverization to a calcining furnace of a cement manufacturing apparatus or a kiln of a rotary kiln or after pulverization, and used as fuel. can do. Further, the power generation boiler can be supplied to the power generation boiler as an alternative fuel for pulverized coal and burned. Note that this pulverization size can be increased to about 10 times, preferably about 5 times that of pulverized coal, with a length corresponding to the diameter, even when flame combustion similar to that at the pulverized end is desired.

  In addition, the product discharged from the heating furnace 20 via the cooling device can be separated into a large particle size and a small particle size by means such as a vibrating sieve. That is, those having a large particle size can be pulverized and used as a raw material or fuel together with those having a small particle size. In addition, those having a small particle size can be recycled to the heating furnace 20 and reused again.

  Further, the product discharged from the heating furnace 20 through the cooling device is further separated by a separation device (not shown), and those having a relatively small particle size having an average particle size of 30 mm or less are further pulverized, for example, cement. It can be used in the same manner as pulverized coal as a fuel in front of a kiln of a rotary kiln of a production apparatus. On the other hand, those having a relatively large particle size with an average particle size exceeding 30 mm are used as raw fuel as fuel in a calcining furnace or kiln bottom of a cement manufacturing apparatus. At that time, foreign substances such as metals that are difficult to separate can be easily separated by a separation apparatus (not shown) by heat treatment in the heating furnace 20.

  The average particle size of the solid raw fuel thus obtained is, for example, 1 to 5 mm, preferably 1.6 to 2.3 mm. Moreover, the composition is about 50 to 85% by weight of carbon, 4 to 9% by weight of hydrogen, 10 to 20% by weight of ash, and about 0 to 2% by weight of sulfur on an anhydrous basis. The higher calorific value of the solid raw fuel is about 20000 to 40,000 KJ / KG on an air-dry basis.

  On the other hand, the pyrolysis gas containing tar generated by pyrolysis of the processed material in the heating furnace 20 is burned in a combustion chamber (not shown) and completely decomposed. When waste plastic containing chlorine such as vinyl chloride is used, hydrogen chloride (HCL) contained in the combustion exhaust gas is recovered by the exhaust gas cleaning device 23.

  In this way, the waste plastic and the anti-fusing material can be mixed, and the solid raw fuel can be produced from the waste plastic by the rotary kiln type heating furnace 20. That is, by using the anti-fusing material, it is possible to effectively prevent the fusion of the waste plastic to the furnace wall of the heating furnace 20 and the agglomeration of the waste plastics, and to efficiently produce the solid raw fuel. it can. The use of pulverized coal normally used in cement production facilities and power generation boilers as an anti-fusing material is also effective in obtaining the anti-fusing material.

  The agglomeration referred to in the present invention means that the molten waste plastic is integrated into a lump. For example, the outlet of the solid raw fuel discharged from the heating furnace is closed, or the solid raw fuel in the subsequent process is blocked. It means that the operation of the apparatus is hindered, for example, the pulverization efficiency decreases in the pulverization process. The allowable range of agglomeration varies depending on the scale of the apparatus, for example, a rotary kiln type furnace, depending on the inner diameter and the kiln length.

  Next, the method for producing a solid raw fuel according to the present invention will be described in more detail by showing examples. However, the scope of the present invention is not limited to these.

    In this test, waste plastics having the composition shown in Table 1 were used. Further, as the anti-fusing material, partial combustion slag having the properties shown in Table 1 was used. Partial combustion slag is a solid content after waste plastic is subjected to partial combustion at 1,500 ° C. with an oxygen ratio of less than 0.8, and the generated partial combustion gas is washed with water and then separated into solid and liquid. Was dried in a constant temperature bath at 105 ° C. until the weight became constant. The average particle diameter in Table 1 was measured using a laser diffraction particle size distribution measuring apparatus (LA-920 manufactured by HORIBA). Moreover, the industrial analysis value was measured according to JISM8812. Furthermore, the calorific value was measured according to JISM8814. The elemental analysis was measured according to JISM8819.

[Reference Example 1]

The waste plastic shown in Table 1 was used as the waste plastic, and the partial combustion slag shown in Table 1 was used as the anti-fusing material. A fusion test of resin waste resin to the furnace wall was conducted in a rotary kiln type heating furnace.
A rotary kiln type heating furnace is composed of a heat-resistant steel SUS310S container (scraping blade (lifter) 8 pieces (blade height 120 mm)) having an inner diameter of φ600 mm × 500 mm (inner volume 145 liters (L)) with a rotational speed of 2.5 rpm (circumference). An electric furnace was used that was heated by external heating while rotating so that the interval time between lifters was 0.05 minutes at a speed of 4.71 m / min.

Samples were produced by mixing 2000 g of waste plastic with a size of 20 mm square or less, which is 80% by weight of the total, and 1330 g of partial combustion slag, and then each sample was put into a rotary kiln type furnace. , And rotated at a rotational speed of 2.5 rpm (circumferential speed 1.96 m / min).
Nitrogen gas was circulated before heating, and after confirming that the oxygen concentration in the furnace gas became 5% by volume or less, the pressure in the furnace was set to 100.7 kPaA (755 Torr) with a vacuum pump. Heating was performed from the atmospheric temperature at a temperature rising rate of 5 ° C./min, and held at 300 ° C. for 10 minutes. Heating was performed while circulating nitrogen inside the heating furnace. Thereafter, air was circulated outside the furnace to cool the internal temperature to 160 ° C. The cooling time was about 90 minutes. Thereafter, the rotation of the heating furnace was stopped and the sample was taken out.

The sample weight after heating was 3053 g, and the solid yield was 91.7% by weight. The solid yield (%) here was calculated by the weight of solid raw fuel after heating / (weight of waste plastic before heating + weight of partial combustion slag before heating) × 100. Moreover, the average particle diameter of the product was 2.0 mm.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good. From the above, it became clear that the solid raw fuel can be easily obtained without damaging the heating furnace.

[Reference Example 2]
A solid raw fuel was produced in the same manner as in Reference Example 1 except that the pressure in the furnace was changed to 99.6 kPaA (747 Torr). The sample weight after heating was 3026 g, and the solid yield was 90.9% by weight. The average particle size of the product was 1.8 mm. Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Example 3]
A solid raw fuel was produced in the same manner as in Reference Example 1 except that air was circulated at a rate of 12 NL / min instead of nitrogen and the pressure in the furnace was changed to 101.4 kPaA (761 Torr). The weight of the sample after heating was 3063 g, and the solid yield was 92.0% by weight. Moreover, the average particle diameter of the product was 1.6 mm. As a result, when heating and pyrolysis of waste plastics while supplying oxygen-containing gas, solid raw fuel with a smaller particle size is obtained compared to heating and pyrolysis under pressure lower than atmospheric pressure. It became clear that it was possible.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Comparative Example 1]
A solid raw fuel was produced in the same manner as in Reference Example 1 except that the pressure in the furnace was changed to 101.4 kPaA (761 Torr). The sample weight after heating was 3006 g, and the solid yield was 90.3% by weight. Moreover, the average particle diameter of the product was 2.4 mm.

[Reference Example 4]
A solid raw fuel was produced in the same manner as in Reference Example 1 except that the temperature in the furnace was changed from 300 to 320 ° C. and the pressure was changed to 100.3 kPaA (753 Torr). The sample weight after heating was 2963 g, and the solid yield was 89.0% by weight. Moreover, the average particle diameter of the product was 2.3 mm.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Example 5]
A solid raw fuel was produced in the same manner as in Reference Example 4 except that air was circulated at a rate of 12 NL / min instead of nitrogen and the pressure in the furnace was changed to 101.4 kPaA (761 Torr). The sample weight after heating was 2970 g, and the solid yield was 89.2% by weight. Moreover, the average particle diameter of the product was 2.0 mm. As a result, when heating and pyrolysis of waste plastics while supplying oxygen-containing gas, solid raw fuel with a smaller particle size is obtained compared to heating and pyrolysis under pressure lower than atmospheric pressure. It became clear that it was possible.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Comparative Example 2]
A solid raw fuel was produced in the same manner as in Reference Example 4 except that the pressure in the furnace was changed to 101.5 kPaA (761 Torr). The sample weight after heating was 2895 g, and the solid yield was 86.9% by weight. The average particle size of the product was 2.5 mm.

[Reference Example 6]
A solid raw fuel was produced in the same manner as in Reference Example 1 except that the temperature in the furnace was changed from 300 to 340 ° C. and the pressure was changed to 100.3 kPaA (753 Torr). The sample weight after heating was 2845 g, and the solid yield was 85.4% by weight. Moreover, the average particle diameter of the product was 2.3 mm.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Reference Example 7]
A solid raw fuel was produced in the same manner as in Reference Example 6 except that the pressure in the furnace was changed to 99.7 kPaA (747 Torr). The sample weight after heating was 2757 g, and the solid yield was 82.8% by weight. The average particle size of the product was 2.2 mm.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Example 8]
A solid raw fuel was produced in the same manner as in Reference Example 6 except that air was circulated at a rate of 12 NL / min instead of nitrogen and the pressure in the furnace was changed to 101.4 kPaA (761 Torr). The sample weight after heating was 2935 g, and the solid yield was 88.1% by weight. The average particle size of the product was 1.8 mm. As a result, when heating and pyrolysis of waste plastics while supplying oxygen-containing gas, solid raw fuel with a smaller particle size is obtained compared to heating and pyrolysis under pressure lower than atmospheric pressure. It became clear that it was possible.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Example 9]
A solid raw fuel was produced in the same manner as in Reference Example 6 except that air was circulated at a rate of 12 NL / min instead of nitrogen, and the pressure in the furnace was changed to 101.1 kPaA (759 Torr). The sample weight after heating was 2867 g, and the solid yield was 86.1% by weight. The average particle size of the product was 1.7 mm.
Furthermore, when the inside of the rotary kiln heating furnace was visually observed after the heating, the resin was not fused to the furnace wall of the heating furnace, and the resins were not fused and agglomerated. Further, when the product was pulverized using a roller mill, the pulverizability was good.

[Comparative Example 3]
A solid raw fuel was produced in the same manner as in Reference Example 7 except that the pressure in the furnace was changed to 101.5 kPaA (761 Torr). The sample weight after heating was 2802 g, and the solid yield was 84.1% by weight. The average particle size of the product was 4.0 mm.

The higher calorific values of the solid raw fuels obtained in the examples and reference examples were both about 30 MJ / kg. The chlorine content was 1% by weight or less. To obtain solid raw fuel with uniform combustion characteristics by treating the waste plastics that are inhomogeneous in heat and unstable in combustion state when used with the above-mentioned solid raw fuel production method. I was able to.

It is a block diagram for demonstrating the main processes of waste processing including the manufacturing method of the solid raw fuel which concerns on one Embodiment of this invention. It is a block diagram which shows an example of the equipment which implements the waste disposal including the manufacturing method of the said solid raw fuel. It is a figure which shows the example of the stirring board inside a rotary kiln type | mold heating furnace.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Waste plastic, 11 ... Conveyor, 12 ... Crusher, 13 ... Transfer device, 20 ... Heating furnace, 23 ... Exhaust gas cleaning device

Claims (4)

In the manufacturing method of a solid raw fuel to produce a solid raw fuel used from the waste plastics in the combustion with a heating furnace, to prevent the agglomeration of fused and the waste plastics of the waste plastics into the furnace wall of the furnace the anti-fusion bonding material is supplied to the furnace together with the waste plastic, the anti-blocking material is a dust or pulverized coal entrained in the combustion gases after burning the organic substance, the waste while supplying an oxygen-containing gas Heat and pyrolyze plastic,
The oxygen-containing gas is in direct contact with the waste plastic inside the heating furnace.
A method for producing a solid raw fuel characterized by the above. The method for producing a solid raw fuel according to claim 1, wherein the heating furnace is under atmospheric pressure . The method for producing a solid raw fuel according to claim 1 , wherein the dust is partial combustion slag. The processing method of the waste plastic which the solid raw fuel manufactured by the manufacturing method of the solid raw fuel of any one of Claim 1 to 3 is supplied to a cement manufacturing apparatus or a boiler for electric power generation, and is burned.

Images