JP5498228B2 - Cement raw fuel supply method - Google Patents

Description

  The present invention relates to a method for supplying cement raw fuel. The present invention particularly relates to a method for supplying raw cement fuel, in which raw fuel derived from biomass is supplied as raw cement fuel.

  Since the raw fuel derived from biomass such as compost discharged as waste generally contains a large amount of moisture, the fuel value as a raw cement fuel is low. On the other hand, some biomass-derived raw fuels have a high calorific value, and it is advantageous if they can be reused as cement raw fuel.

  Further, when collecting raw fuel derived from biomass, those having a low bulk density are bulky, so that they require a large space for storage and cannot be efficiently transported, resulting in an increase in transportation costs.

Japanese Patent No. 4316486

  In view of the above circumstances, the present invention makes it possible to obtain a raw material for cement by granulating a raw material derived from biomass having a low bulk density and a large amount of water. An object of the present invention is to provide a method for supplying a cement raw fuel that can be efficiently transported.

In order to solve the above-described problems, according to the present invention, on-site biomass-derived raw fuel is granulated with a dewatering-reducing container, and the granulated biomass-derived raw fuel is transported by a mobile vehicle. A method of supplying raw cement fuel to a cement factory is provided, wherein the transported raw fuel derived from biomass is fed as a raw cement fuel into a cement kiln or boiler.
The reducing container is a flat die granulation having a disk-shaped die having a large number of through-holes for molding, the rotation axis of which is oriented in the vertical direction, and a pressure roller disposed at the center of the die. A device is preferred.
When transported by the mobile vehicle, it is preferable to close-pack with the raw material fuel derived from biomass.
The granulated raw fuel derived from biomass preferably has a diameter of 4 to 30 mmφ, a length of 5 to 70 mm, a moisture content of 5 to 40%, and a calorific value of 2000 kcal / kg or more.

  According to the method for supplying cement raw fuel according to the present invention, it is possible to obtain raw cement fuel by granulating raw fuel derived from biomass having a low bulk density and a large amount of water, It is possible to efficiently transport such cement raw fuel.

It is a conceptual diagram which shows one Embodiment of the supply method of the cement raw fuel which concerns on this invention. It is a schematic diagram which shows an example of the flat die type granulator used by this invention. It is a schematic diagram which shows an example of the apparatus structure of the cement kiln utilized by this invention.

Hereinafter, an embodiment of a method for supplying raw cement fuel according to the present invention will be described with reference to FIG.
First, the mobile vehicle 1 goes onsite 2. A hook roll container 3 is mounted on the mobile vehicle 1, and a movable container / portable container 4 is installed in the hook roll container 3. The on-site 2 is a source or storage location of biomass-derived raw fuel that is the object 5 of the cement raw fuel of the present invention.
As the mobile vehicle 1, in addition to the vehicle on which the hook roll container 3 as described above is mounted, any vehicle can be used as long as it can be separated. For example, an arm roll car etc. can be mentioned. In the case of the portable container 4, the hook roll container 3 can be separated from the mobile vehicle 1 and temporarily installed on the site 2.
In addition, although it is suitable to use a mobile type reduction container and a portable type reduction container, it is also possible to install a fixed type reduction container in the on-site 2 and to perform the process of the present invention.
Examples of biomass-derived raw fuel include compost, food waste, municipal waste, paper waste, wood waste, and the like. Moreover, if the combustion calorie of the biomass-derived raw fuel is in the range of 2000 kcal / kg or more, it can be a target of the cement raw fuel of the present invention.
As for the particle size of the raw fuel derived from biomass, the maximum particle size is preferably 40 mm or less, and the average particle size is preferably 5 mm or less. This is because if the particle size is smaller than this, there is no need for pretreatment such as pulverization, the granulation efficiency is good, and the input amount to the apparatus is easy to control.

Next, the raw fuel derived from biomass is granulated at the on-site 2 by a mobile reduction container / portable reduction container 4 that can be dehydrated, or a fixed reduction container (not shown).
The movable container / portable container 4 or the stationary container (not shown) used in the present invention is a disk-shaped die having a large number of through-holes for molding, the rotation axis of which is in the vertical direction. And a general flat die granulator having a pressure roller disposed at the center of the die. The operation method of the flat die granulator will be described with reference to FIG. Biomass-derived raw fuel, which is the object 5 to be treated, is introduced onto a disk-shaped die 11 provided with a through-hole for molding, and a pressure roller 12 is rotated on the die 11 so that the biomass-derived raw fuel is obtained. Is compressed and extruded by being pressed into a molding through-hole while being crushed by the pressure roller 12, and the raw fuel derived from biomass is granulated.
Next, regarding the operating conditions of the flat die granulator, the molding temperature is in the range of 50 to 170 ° C. The diameter of the through hole for molding is in the range of 4 to 30 mm. The rotation speed of the pressure roller 12 is in the range of 30 to 140 rpm.

  The raw fuel derived from biomass generated or stored at the on-site 2 contains a large amount of moisture. In the flat die granulator, this amount of water can be adjusted. The water content varies depending on the type of biomass-derived raw fuel that is the object to be treated 5. About raw material fuel derived from biomass, water content can be adjusted by dehydrating with a flat die type granulator. The amount of water in the raw fuel derived from biomass after dehydration can be reduced, for example, in the range of 5 to 20%, compared with that before dehydration.

The granulated raw material fuel (granulated material) 13 is preferably a pellet. By making the raw fuel derived from biomass having a low bulk density into pellets, the bulk density can be increased and the volume can be reduced.
In addition, the raw fuel (granulated material) 13 derived from the granulated biomass may not be a pellet. As will be described later, the hook-roll container 3 loaded with the granulated biomass-derived raw fuel (granulated material) 13 is filled with the biomass-derived raw fuel and transported as the closest packing. It is also possible to do.

  It is preferable that the pellets molded by the flat die granulator have a diameter of 4 to 30 mmφ, a length of 5 to 70 mm, a moisture content of 5 to 40%, and a calorific value of 2000 kcal / kg or more. This is because pellets having such specifications provide suitable fuel properties as cement raw fuel. Further, when such pellets are used as fuel for a burner of a cement kiln, the pellet diameter is preferably in the range of 4 to 15 mmφ, and when used as auxiliary fuel for a preheater in a boiler, the pellet diameter is preferably in the range of 10 to 30 mmφ. .

  Unlike the screw-type RPF / RDF production equipment that requires high pressure and high temperature, the flat die type granulation equipment has an open structure, so it is safe to remove moisture or steam contained in the raw fuel derived from biomass. In addition, it can be efficiently dehydrated and the fuel value as a cement raw fuel can be increased. In addition, since it is molded at a low pressure, it is difficult for water to be enclosed in the raw fuel (granulated material) derived from the granulated biomass, and excess water in the granulated material is dehydrated and discharged out of the system. Can do.

Next, the raw fuel 13 derived from the granulated biomass is transported by the mobile vehicle 1 (reference numeral 6 in FIG. 1).
The granulated material (pellet) 13 described above is stacked on the hook roll container 3, and the hook roll container 3 is mounted on the mobile vehicle 1 and transported to the cement factory 7. As described above, since the bulk density during transportation can be increased by using pellets, the transportation cost can be reduced, and the price advantage as a cement raw fuel can be increased.
The hook roll container 3 loaded with the granulated material (pellet) 13 described above can be filled with biomass-derived raw fuel, and the hook roll container 3 can be transported as the closest packing. In this case, it can be executed by attaching a vibration device to the hook roll container 3 and filling the raw material fuel derived from biomass while vibrating the hook roll container 3. By carrying out the close-packing, the bulk density during transportation can be increased, so that the transportation cost can be reduced. Therefore, the shape of the granulated material (pellet) 13 described above may be broken during transportation.

Next, the conveyed biomass-derived raw fuel 13 is charged as cement raw fuel into a cement kiln 21 or a boiler.
The apparatus structure of the cement kiln 21 which inputs the conveyed raw fuel 13 derived from biomass as the cement raw fuel 32 will be described with reference to FIG.
The cement kiln (firing furnace) 21 is a long cylindrical rotating body for firing the cement raw material 24 to produce the clinker 27. On the raw material supply side of the cement kiln 21, in order to preheat and decarboxylate the cement raw material 24 and to discharge the exhaust gas 25 generated in the cement kiln 21 out of the system, a preheater 22 composed of a plurality of cyclones, and calcining A furnace 23 is connected. A cooler 26 for cooling the fired product (clinker) is connected to the fired product discharge side of the cement kiln 21. Further, a burner 28, a pipeline 30 for supplying the cement raw fuel 32, and the like are provided on the fired material discharge side of the cement kiln 21 so that the raw material of the cement kiln 21 has a high temperature atmosphere of about 1450 ° C. It is arranged. The pipe 30 has one end connected to the blower 31 and the other end connected to the burner 28. A storage / quantitative supply device 29 for storing the cement raw fuel 32 and supplying it to the pipeline 30 is connected to a predetermined point of the pipeline 30 (near the blower 31).

Next, the operation method of this cement kiln is demonstrated using FIG.
First, the cement raw material 24 is charged into the raw material charging port provided in the upper part of the preheater 22. The cement raw material 24 is preheated and decarboxylated while moving downward in the preheater 22 and the calcining furnace 23, and then moves from the kiln bottom into the cement kiln 21.
The cement raw material gradually moves in the cement kiln 21 having a gentle slope and rotating gently toward the front of the kiln where the burner 28 is disposed, and is baked in the process to become a clinker 27. . The clinker 27 is dropped into the cooler 26 from before the kiln of the cement kiln 21, cooled by the cooler 26, and then discharged.
The temperature inside the cement kiln 21 is controlled so that the maximum temperature of the raw material (the temperature of the raw material near the flame of the burner 28) is about 1450 ° C. In order to maintain such a high temperature atmosphere, the cement raw fuel 32 obtained in the present invention is replaced with pulverized coal which is the main fuel of the cement kiln 21 or in combination with pulverized coal from the burner 28 into the furnace. It is thrown.

The cement raw fuel 32 obtained in the present invention is temporarily stored in the storage / quantitative supply device 29. Instead of using the storage / quantitative supply device 29, the cement raw fuel 32 may be directly supplied to the pipe line 30 from the hook roll container 3 loaded with the cement raw fuel 32 described above.
The raw cement fuel 32 in the storage / quantitative supply device 29 falls into the pipe line 30 at a predetermined supply speed by a supply amount adjusting means such as a rotary feeder provided at the bottom of the storage / quantitative supply device 29. The dropped cement raw fuel 32 moves in the pipe line 30 toward the cement kiln 21 at a predetermined flow rate by the wind pressure from the blower 31, and from the fuel injection port of the burner 28 connected to the end of the pipe line 30. It is injected into the cement kiln 21 at a predetermined injection speed.
The cement raw fuel 32 thrown into the furnace is completely burned in a short time before landing on the furnace bottom by the flame from the burner 28. The combustion residue of the raw cement fuel 32 becomes a part of the clinker component. Since the cement raw fuel 32 is completely burned before landing, the quality of the clinker is not deteriorated.
In order to increase the processing amount of the cement raw fuel 32 per unit time, the cement raw fuel 32 may be introduced from the kiln bottom of the cement kiln 21 as indicated by an arrow A in FIG.

As described above, the amount of heat per volume is increased by making the raw fuel derived from biomass into pellets or by performing close-packing. Therefore, the raw cement fuel obtained in the present invention can be used as the above-mentioned cement kiln burner fuel as an alternative to fossil fuel.
Note that the raw cement fuel obtained in the present invention can be used as an auxiliary fuel for a preheater in a boiler, in addition to the above-described cement kiln burner fuel, as an alternative to fossil fuel.

As described above, according to the method for supplying raw cement fuel according to the present invention, it is possible to obtain raw cement fuel by granulating raw fuel derived from biomass having a low bulk density and a high water content. This makes it possible to efficiently transport such raw cement fuel to a cement factory.
In addition, according to the method for supplying cement raw fuel according to the present invention, it is possible to construct an efficient cement raw fuel supply system for commercialization in consideration of work personnel, work place, processing amount, and the like.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely using an Example etc., this invention is not limited to an Example.

Examples 1-4
Various composts were introduced from the hopper, and pellets were produced using a flat die granulator temporarily installed at the compost generation source. Example 1 used livestock compost (cattle), Example 2 used livestock compost (pig), Example 3 used food compost, and Example 4 used municipal waste compost. The results are shown in Table 1.

  From Table 1, in any of Examples 1 to 4, the bulk density increased and the water content decreased by using pellets. From this, it was confirmed that compost having a low bulk density and a large water content can be reused as a raw cement fuel. Therefore, it was shown that the above-mentioned cement raw fuel can be efficiently transported to the cement factory by using the method for supplying raw cement fuel according to the present invention.

DESCRIPTION OF SYMBOLS 1 Mobile vehicle 2 On-site 3 Hook roll container 4 Mobile reduction container / portable reduction container 5 Object 6 Transport 7 Cement factory 11 Dice 12 Pressure roller 13 Granulated material 21 Cement kiln 22 Preheater 23 Calciner 24 Cement Raw material 25 Exhaust gas 26 Cooler 27 Sintered product (clinker)
28 Burner 29 Storage / Quantitative supply device 30 Pipe line 31 Blower 32 Cement raw fuel

Claims (3)

On-site biomass-derived raw fuel is granulated in a dewatering-reducing container, the granulated biomass-derived raw fuel is transported by a mobile vehicle, and the transported biomass-derived raw fuel is cement raw fuel. as was poured into a cement kiln or boiler,
A method for supplying raw cement fuel to a cement factory , wherein the raw fuel derived from biomass is packed closest when transported by the mobile vehicle .   Flat die type granulation in which the reducing container has a disk-shaped die having a large number of through-holes for molding, the rotation axis of which is oriented in the vertical direction, and a pressure roller disposed at the center of the die. The method for supplying raw cement fuel according to claim 1, wherein the raw material is cement. The granulated biomass diameter of the raw fuel from the 4～30Mmfai, length 5～70Mm, moisture content 5-40%, the heat generation amount is equal to or is 2000 kcal / kg or more claims 1 or The method for supplying raw cement fuel according to 2 .

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