JP4058910B2 - How to dispose of combustible waste - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applicable to, for example, a combustible waste having a large degree of bulk such as a tape such as a magnetic tape, a sheet-like or film-like plastic, or a laminated film after recovering pulp from a laminated waste paper, to a combustion furnace. while volume reduction to transport to put easily form, it relates to a method for the those that reduced iodide dispose while effectively utilized in cement burning process.
[0002]
[Prior art]
The amount of industrial waste generated has been increasing year by year. As the processing method, landfill processing, incineration processing and the like are known. However, incineration treatment has attracted attention because it has become difficult to secure a landfill site. Among such industrial wastes, combustible wastes such as waste plastic generate a sufficient amount of heat by incineration, and are therefore being used as fuel for various combustion furnaces in order to effectively use the amount of heat generated by the combustion.
[0003]
For example, as a method of using combustible waste such as waste plastic as a fuel, as disclosed in Japanese Patent Application Laid-Open No. 7-277788, etc., the main fuel is injected into a rotary kiln of a cement firing facility and burned. A technique for reducing the amount of pulverized coal used has been known for some time.
[0004]
[Problems to be solved by the invention]
However, plastic waste materials discarded in the form of tapes, films, sheets, etc., or flammable waste with a very large degree of bulk such as office papers crushed with a shredder are not suitable for cement production. Various problems occur when supplying to rotary kilns and calcining furnaces. That is, these waste materials are extremely difficult to handle, such as storage, transportation, and weighing. For example, when storing, a vast storage space is required because the bulk specific gravity is small. Further, when transporting by car, since the bulk specific gravity is small, the transport amount per car is extremely small, the transport efficiency is remarkably bad, and it is easy to scatter. Furthermore, even when transported by a transport machine such as a belt conveyor, scattering, spillage, clogging, etc. are likely to occur. In addition, there is a problem that, when it is put into a combustion furnace, the thrown-up thing soars.
[0005]
In view of this, a method has been considered in which these combustible wastes are heat-compressed by addition of a binder to solidify the volume. However, flammable waste sent through the cleaning process often has moisture attached. In such a case, if the heating temperature is increased for volume reduction, a steam explosion occurs. The danger comes out. Therefore, there is a problem that the conventional volume reduction solidification method cannot be adopted unconditionally. In addition, the conventional volume reduction and solidification method requires equipment for heat compression, which is costly and complicates the process.
[0006]
The present invention is, in consideration of the above circumstances, and an object thereof is to provide a method for disposal by simple and safe volume reduction of combustible wastes such as large magnetic tape handling form easy degree bulky.
[0007]
[Means for Solving the Problems]
In the method for disposing combustible waste according to the first aspect of the present invention, compressible and bulky combustible waste is accommodated in a bag capable of maintaining airtightness, and the air in the bag is exhausted. Then, it is compressed to form a mat, and the flammable waste in a bag formed into the mat is crushed by a crusher as it is, and the resulting crushed product is harder than that. It is characterized by being added as auxiliary fuel to the cement firing process after being mixed with the crushed product .
[0008]
Thus, by compressing by decompression and forming the whole bag in a mat shape, a large number of sheets can be stacked when stored or transported by car. Therefore, it can be stored and loaded in large quantities, and storage efficiency and transportation efficiency are improved. In addition, since it is in a bag, handling operation during weighing and the like can be performed very easily, and it is not necessary to take measures against scattering. Moreover, since it can be put into the combustion furnace as it is in the bag, there is no need to worry about scattering or spilling or soaring. Furthermore, since the volume can be reduced simply and safely without cost by using a household vacuum cleaner or a vacuum pump, it is easy to realize compared with the conventional heat compression type volume reduction method.
[0013]
In addition, when the flammable waste reduced to a mat shape is introduced into the cement firing process, a method is adopted in which the bag is crushed and then introduced into the cement firing process, which facilitates mechanization.
In addition, when a flammable waste with a large degree of bulk is applied to a crusher in its bulky state, the crushing ability is 1 / compared to the case of crushing a hard flammable waste (hard plastic, etc.). Although it will be reduced to about 3, it can be recovered by crushing it with a bag while it is vacuum-sucked and compressed into a mat to reduce the volume. For example, when sucked with a household vacuum cleaner, the amount of crushing ability can be reduced to 2/3, and when sucked with a vacuum pump, it is equivalent to that when crushing hard flammable waste. The above crushing capacity can be ensured. That is, the crushing capacity can be increased according to the level of compression.
[0015]
Furthermore, it becomes possible to improve the balance of the combustion distribution by mixing it with a crushed product of hard flammable waste (for example, block-like or thick plastic waste) and then putting it into the cement firing process. .
[0016]
The method for disposing combustible waste according to the invention of claim 2 is the method according to claim 1, wherein a mixture of a crushed product crushed by a crusher with a bag and a crushed product of a harder combustible waste is burned with cement. It is characterized in that it is blown into the rotary kiln by putting it in an air flow from the front part of the rotary kiln of the process toward the bottom of the kiln.
[0017]
In this way, when the mixture is blown in the air flow from the front of the kiln of the rotary kiln, the bulk specific gravity of the crushed product is dispersed, so that it is possible to reach the wide range of the firing area of the rotary kiln while dispersing the combustible waste. The combustion balance can be improved.
[0018]
The method for disposing combustible waste according to the invention of claim 3 is the mixing method of the mixture of a crushed product crushed by a crusher with a bag and a crushed product of harder flammable waste in claim 2 After adjusting the ratio, it is characterized by blowing in an air stream from the front of the kiln of the rotary kiln.
[0019]
In this way, by adjusting the mixing ratio of the two types of crushed products, it is possible to adjust the combustion distribution and the degree of dispersion of the reach distance. In addition, combustible waste with a large degree of bulk is crushed in a mat-like volume-reduced state, so the weighing accuracy is improved and the mixing ratio adjustment when mixing with hard combustible waste is accurate. Will be able to do.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a procedure from volume reduction of combustible waste to loading into a car.
When implementing the volume reduction method of this embodiment, the airtight bag 1 of the magnitude | size which is easy to handle first is prepared. The bag 1 is desirably a resin-made rectangular shape that is sealed on three sides and opened on one side, and a commercially available product with an airtight chuck attached to the opening 1a can be used.
[0021]
As shown in FIG. 1 (a), the bag 1 has a large degree of bulk such as a tape such as a magnetic tape, a sheet-like or film-like plastic, and a laminated film after the pulp is recovered from waste laminated paper. Push a large amount of combustible waste 2. And if it accommodates in the bag 1, as shown to (b), the pipe | tube of the blower 3 will be inserted from a clearance gap, narrowing the opening part 1a of the bag 1, and internal air will be exhausted with the blower 3. FIG. Here, as the blower 3, it is ideal to use a vacuum pump, but a household vacuum cleaner or the like may be used. By vacuum suction in this way, as shown in (c), the combustible waste 2 inside is compressed together with the bag 1, and a mat-like combustible waste 2A is completed. At this stage, it is advantageous in a post-process to form a mat having a thickness of about 10 to 20 cm.
[0022]
Since the combustible waste 2A thus compressed and formed into a mat shape is in a mat form, a large number of sheets can be stacked. As shown in FIG. Can be loaded. Therefore, the transportation efficiency is greatly improved. Moreover, since a large number of sheets can be stacked when storing, the storage efficiency is greatly improved. In addition, since it is in a bag, handling operation during weighing and the like can be performed very easily, and it is not necessary to take measures against scattering. Furthermore, since it can be put into the combustion furnace as it is in the bag, there is no need to worry about scattering or spilling or soaring.
[0023]
Further, the volume reduction method in this case is only compression by decompression using the bag 1 and the blower 3, and unlike the volume reduction solidification method by heat compression, heating is not required. Even the adhering combustible waste 2 can be safely reduced in volume, and it is not necessary to use a large volume reduction and solidification device.
[0024]
FIG. 2 shows a procedure until the mat-like combustible waste 2A formed as described above is put into a cement firing step. In the figure, 10 is a rotary kiln for a cement firing step, 10A is a kiln front part, and 10B is a kiln bottom part. The cement raw material G1 is charged into the rotary kiln 10 from the kiln bottom 1B, fired while moving in the rotary kiln 10, and discharged as a cement clinker G2 from the cooler 11 of the kiln front 10A.
[0025]
A kiln front portion 10A, which is the downstream end of the rotary kiln 10, is provided with a main fuel nozzle 12 such as coal powder or heavy oil, and an injection nozzle 13 for combustible waste. Fuel and combustible waste products are fed into the rotary kiln 10. Here, the pulverized combustible waste product is used as an auxiliary fuel for cement clinker firing by being blown into the rotary kiln 10 in an air flow from the kiln front part 10A toward the kiln bottom part 10B. .
[0026]
In manufacturing a cement clinker using this equipment, the flammable waste 2A formed in the mat shape is put into the rotary kiln 10 as an auxiliary fuel. In that case, when charging, the method (A) of charging in the form of the mat as it is, or the flammable waste 2A in the bag formed in the mat shape is crushed by the crusher 7 and then charged. Either or both of the methods (B) can be employed.
[0027]
In the case of charging by the method (B), the crushed product 2C can be blown into the rotary kiln 10 by being put on the air flow (air) from the nozzle 13 of the kiln front part 10A of the rotary kiln 10, so that it can be easily mechanized. .
[0028]
By introducing the flammable waste 2A, which has been reduced to a mat-like shape, into the cement firing process as an auxiliary fuel in the form of a bag, the waste can be effectively used while facilitating handling. Main fuel such as pulverized coal can be saved.
[0029]
Further, as shown in FIG. 3, a crushed product 2C of combustible waste 2A formed in a mat shape, and a hard plastic (hard combustible waste) 22A such as a hard block shape or a thick material shape. After mixing with the crushed product 22C, the air flow may be blown into the rotary kiln 10 from the nozzle 13 of the front kiln 10A of the rotary kiln 10.
[0030]
In that case, the measuring devices 6 and 26, the crushers 7 and 27, and the mixer 28 are prepared in the combustible waste input system, and mixed while adjusting the mixing ratio of the combustible wastes 2A and 22A. Try to blow things.
[0031]
In this way, by mixing the crushed combustible waste 2C into the rotary kiln 10 after mixing with the hard plastic crushed product 22C, the combustible waste can be appropriately distributed over a wide range of the firing area of the rotary kiln 10. It is possible to achieve a good balance of combustion distribution. Moreover, by adjusting the mixing ratio of the two types of crushed products 2C and 22C, it is possible to adjust the combustion distribution and the degree of dispersion of the reach distance. In addition, although the plastic was illustrated as a hard combustible waste, it is not specifically limited to it.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, combustible waste having a large bulkiness is put in an airtight bag and compressed and reduced into a mat shape by a so-called vacuum pack method. When transporting by car or by car, a large number of sheets can be stacked, and storage efficiency and transport efficiency can be improved. In addition, since it is in a bag, handling operation during weighing and the like can be performed very easily, and no scattering measures are required. Moreover, since it can be put into the combustion furnace as it is in the bag, there is no need to worry about scattering or spilling or soaring.
[0035]
In addition, the crushed product that has been crushed with a crusher in the form of a bag is mixed with the crushed product of harder flammable waste and then injected into the cement firing process as an auxiliary fuel. Can be improved.
[0036]
According to the invention of claim 2 , since the mixture of the two kinds of crushed products in claim 1 is blown from the front part of the kiln of the rotary kiln toward the kiln bottom part, it is combustible in a wide range of the firing area of the rotary kiln. It is possible to reach the volatile waste while dispersing it, and to improve the combustion balance.
[0037]
According to the invention of claim 3 , since the mixture of the two kinds of crushed products is blown into the rotary kiln after the mixing ratio is adjusted, the combustion distribution is adjusted and the dispersion degree of the reach distance is adjusted by mixing the mixture. It can be adjusted according to the ratio.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a procedure for volume reduction according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram showing a procedure until the combustible waste reduced to a mat shape according to the embodiment of the present invention is put into a cement firing step.
FIG. 3 is an explanatory diagram of another embodiment of the present invention.
[Explanation of symbols]
1 bag 2 flammable waste 2A mat-like flammable waste 2C shredded product 7,27 shredder 10 rotary kiln 10A kiln bottom 10B kiln front 22A hard plastic (hard combustible waste)
22C crushed product

Claims (3)

Compressible and bulky flammable waste is contained in a bag that can maintain airtightness, and the air in the bag is exhausted to form a mat that is compressed. The formed combustible waste in the bag is crushed with a crusher as it is in the bag, and the obtained crushed product is mixed with the crushed product of harder combustible waste. Disposal method of combustible waste, characterized by being introduced as The mixture of the crushed product crushed by the crusher with the bag and the crushed product of harder combustible waste is put on the air flow from the front of the kiln of the rotary kiln in the cement firing process toward the bottom of the kiln. The method for disposing of combustible waste according to claim 1, wherein the combustible waste is blown into a rotary kiln . The mixture of the crushed product crushed by the crusher with the bag and the crushed product of harder combustible waste is blown in the air flow from the front of the kiln of the rotary kiln after adjusting the mixing ratio. The disposal method of the combustible waste of Claim 2 characterized by the above-mentioned.

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