JPH11189445A - Production and producing apparatus for cement clinker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce plural kinds of cement clinkers having prescribed mineral composition from the same raw material powder in the same cement clinker- producing apparatus of one furnace type. SOLUTION: In this method for producing cement clinker by introducing preheated cement raw material powder into a fluidized bed type or spouted bed type granulating and burning furnace 14 to carry out granulation and baking of powder, introducing the granulated and burned material into a cooler 20 and cooling the material, cement clinker from the cooler 20 is classified into granulated materials having at least two kinds of particle diameters to provide at least two kinds of cement clinkers having different mineral compositions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a one-furnace type cement clinker manufacturing apparatus using a fluidized bed type or spouted bed type granulating / firing furnace, which comprises a plurality of types of mineral powders having different mineral compositions from the same raw material powder. The present invention relates to a method and an apparatus for manufacturing a cement clinker.

[0002]

2. Description of the Related Art Cement clinker is a method of preheating a raw material powder mixed and ground with limestone or silica sand, calcining, granulating the preheated and partially calcined raw material powder, firing, and then cooling. Manufactured by Conventionally, in order to produce a cement clinker having a predetermined mineral composition, a raw material powder corresponding to a required cement clinker composition is prepared, and the cement clinker is produced by firing a rotary kiln so that the mineral composition is as uniform as possible. doing. When manufacturing cement clinker by this rotary kiln firing method,
Although a slight change in the composition is observed depending on the particle size of the cement clinker, there is no difference in composition as the type of the cement clinker is different. Therefore, in the rotary kiln firing method, 1
From one type of raw material powder, one type of cement clinker having a stable mineral composition is always obtained. That is, the cement clinker fired in the rotary kiln (piston flow) has a substantially constant residence time and clinker composition, and becomes one kind of cement clinker corresponding to the raw material powder composition.

In recent years, in order to efficiently produce a high-quality cement clinker, a two-furnace type cement clinker manufacturing apparatus combining a fluidized-bed granulating furnace and a rotary kiln-type firing furnace has been proposed (see, for example, Japanese Patent Application Laid-Open No. H7-17751). No.),
2. Description of the Related Art A two-furnace type cement clinker manufacturing apparatus in which a spouted fluidized bed granulating furnace and a fluidized bed firing furnace are combined is known (for example, see Japanese Patent Application Laid-Open No. 6-287039). Further, a one-furnace type cement clinker manufacturing apparatus using a fluidized bed granulating / firing furnace is known in order to efficiently bake high quality cement clinker with small heat loss (for example, Japanese Patent Application Laid-Open No. 8-81245). Reference).

[0004]

In the conventional rotary kiln firing method, to obtain cement clinkers having different mineral compositions, that is, different types of cement clinkers,
It is necessary to change the composition of the raw material powder, and when the production type is changed, the entire production line must be washed out. Therefore, there is a problem that it takes a long time to perform the switching and that a nonstandard product is easily generated at the time of the switching. Also,
Changes in operation may cause the production line to become temporarily unstable.

The inventors of the present invention have conducted intensive studies to solve the problems of the prior art as described above. As a result, cement obtained by granulating and firing a cement raw material powder in a fluidized bed furnace or a spouted bed furnace is obtained. It has been found that the clinker has a larger particle size as the residence time elapses, and that the mineral composition varies depending on the particle size. Specifically, it was found that the small diameter portion of the cement clinker fired with a certain raw material powder composition became a normal Portland cement clinker, and the large diameter portion became an early-strength cement clinker.

The present invention has been made in view of the above-mentioned points, and has been made based on the above-mentioned new findings. An object of the present invention is to provide a method of granulating and firing in a single furnace by a fluidized bed method or a spouted bed method. It is an object of the present invention to provide a method and an apparatus for producing a plurality of types of cement clinkers each having a predetermined mineral composition by classifying a cooled cement clinker.

[0007]

In order to achieve the above object, a method for producing a cement clinker according to the present invention comprises introducing a preheated cement raw material powder into a fluidized bed or spouted bed type granulating and firing furnace. In the method for producing a cement clinker in which the granulated and fired product is introduced into a cooler and cooled, the cement clinker from the cooler is classified into at least two types of granules having a particle size. Thus, at least two types of cement clinkers having different mineral compositions are obtained (see FIGS. 1 to 10). Each classified material (granular material) is put into a separate clinker hopper (see FIG. 1).

In the above method, at least two types of cement clinker are coarse particles and fine particles, and the amount of the coarse clinker and the fine particles is controlled to be a predetermined ratio. (See FIGS. 9 and 10). Further, it is preferable to classify fine particles of 0.5 mm or less at the discharge part of the granulating / firing furnace and return the fine particles to the granulating / firing furnace. Fine particles having a size of 0.5 mm or less are not sufficiently granulated and fired. Therefore, when the granules are returned to the granulating and firing furnace and granulated and fired, the quality of the clinker is further improved and stabilized. In addition, the cement raw material powder can be configured so as to be a raw material compound necessary for obtaining a plurality of product types and production amounts (see FIG. 11).

An apparatus for manufacturing a cement clinker according to the present invention comprises:
Suspension preheater for preheating cement raw material powder, calcining furnace for calcining preheated cement raw material powder, and fluidized bed or spouted bed granulation and firing for granulating and firing calcined cement raw material powder Furnace and granulation from granulation and firing furnace
In a cement clinker manufacturing apparatus having a cooler for cooling a fired product, at a cement clinker outlet of the cooler,
It is characterized in that a classifier for classifying the cement clinker from the cooler into granules having at least two kinds of particle diameters is connected (see FIGS. 1 to 10). As a classifier,
Although a sieve and an air classifier are used, it is particularly preferable to use a vibrating sieve. A separate clinker hopper is connected to each classifier outlet of a classifier such as a vibrating sieve (see FIG. 1).

In the above apparatus, a forked portion is connected to a cement clinker outlet of the cooler, and one of the forked portions is used as a product outlet, and the other of the forked portions is provided with a cement clinker having at least two types of granules having at least two particle sizes. In some cases, a vibration sieve for classifying objects is connected (see FIG. 7). In addition, a clinker hopper for separately storing each classified material is connected to each of the classified material outlets of the vibrating sieve via the granular material transfer means and the feeder, and a weight sensor is provided for each of the clinker hoppers. It is also possible to connect the motor with a motor via a ratio setting device so that the motor can be controlled by the value of the weighing scale, so that each of the classified materials put into each clinker hopper has a constant weight ratio. (See FIGS. 9 and 10).

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments and can be implemented with appropriate modifications. FIG. 1 shows an apparatus for manufacturing a cement clinker according to a first embodiment of the present invention. In FIG.
10 suspension preheater including cyclones C ₁ -C _4, 12 is Kariyakiro, 14 fluidized bed or spouted bed type or a granulating and sintering furnace for these combination methods, 20
Is a cooler. The granulation / sintering furnace 14 is, for example, a gas dispersion plate 21 upper surface or a gas dispersion plate 21 of a fluidized bed granulation / sintering furnace.
A clinker drop port 23 is provided on the extension of the upper surface, a gate 25 capable of adjusting the opening area of the clinker drop port 23 is provided near the clinker drop port 23, and the clinker drop port 23 is provided with a discharge chute 28 and an airtight discharge device 30. And a classifier / cooling air blowing pipe 31 for cooling and classifying the clinker to the discharge chute 28, and discharging the clinker from the clinker drop port 23,
Air for classifying and cooling the clinker is blown into the discharge chute 28 connected to the drop port 23 so that the air flow rate blown out from the drop port 23 is different from the air flow rate flowing through the nozzle of the gas dispersion plate 21. In addition to adjusting the amount of air, the opening area of the drop port 23 is adjusted so that the differential pressure of the fluidized bed 33 is in a substantially constant range, and the clinker is cooled through the airtight discharge device 30 below the classifying / cooling air blowing position. It is configured to be introduced into the vessel 20. 32
Denotes an ejector, 35 denotes a throat, and 37 denotes a pulse air supply pipe. The cooler 20 is, for example, a packed bed cooler. Note that a fluidized bed cooler or the like may be used instead of the packed bed cooler.

FIG. 2 shows a fluidized bed granulating / firing furnace 1 having a structure in which a clinker drop port 23 is provided on an extension of the upper surface of a gas dispersion plate 21.
FIG. 4 is a cross-sectional view showing an example of a fourth example. A discharge groove 38 extending from the gas dispersion plate 21 to the clinker drop port 23 is formed, and a nozzle 39 is provided in the discharge groove 38. By using a fluidized bed granulation / sintering furnace having such a structure, classification performance can be improved.

In FIG. 1, the cement raw material powder introduced into the system from the raw material introduction chute 26 is cyclone C ₄ ,
After being preheated and partially calcined through C ₃ , C ₂ , a calciner 12 and a cyclone C ₁ , it is put into a granulating / sintering furnace 14. The granulated / fired product granulated, sized and fired in the granulating / firing furnace 14 is supplied from the discharge chute 28 to the cooler 20 via the airtight discharge device 30 and cooled by the cooler 20 to be cooled. Be a clinker. The hot air from the cooler 20 is introduced into the fluidized bed granulating / firing furnace 14 through the throat 35 and the gas dispersion plate 21. The granulated / fired product from the granulating / firing furnace 14 is discharged from the clinker drop port 23 to the discharge chute 2.
When the cement clinker falls into 8, the cement clinker having a particle size of 0.5 mm or less is classified, returned to the granulating / firing furnace 14, and granulated and fired. By doing so, the quality of the clinker is improved and stabilized.

In the cement clinker manufacturing apparatus configured as described above, a plurality of types of cement clinkers are shown at the cement clinker outlet 36 of the cooler 20 (FIG. 1 shows two types of cement clinkers as an example). A classifier, for example, a vibrating sieve 40, for classifying into particles having a particle size is connected. And each classifier outlet 4 of the vibrating sieve 40
Clinker hoppers 46 and 48 are connected to 2 and 44, respectively. In the present embodiment, the case where the vibrating sieve 40 is divided into two stages and the clinker A having a small particle size and the clinker B having a large particle size are classified is shown. However, the vibrating sieve may be provided with three or more stages. .

The granulating / sintering furnace 14 and the cooler 2 shown in FIG.
Instead of 0, a granulating / firing furnace and a cooler having another structure, for example, a granulating / firing furnace and a cooler having a structure as shown in FIGS. 3 and 4 can be used. The granulating / firing furnace 14a and the cooler shown in FIG.
A secondary cooler 18 is connected, and the primary cooler 18 is connected to a secondary cooler 20a via an airtight discharge device 30. In the granulating / firing furnace 14b and the cooler shown in FIG. 4, a fluidized bed type primary cooler 18a is connected to a discharge chute 28 through an airtight discharge device 27.
a is connected to a secondary cooler 20b via an airtight discharge device 30. The combination structure of the granulating / firing furnace and the cooler shown in FIGS. 3 and 4 has an advantage that the classification performance is further improved.

FIGS. 5 and 6 show another example of a spouted fluidized bed granulating / firing furnace. A gas dispersion plate 21 having a perforated plate structure (hole diameter: 20 to 100 mm) is provided above a throat 35 which connects the granulation / sintering furnace 14c and the cooler 20 in the vertical direction.
A fuel supply line such as a pulverized coal fuel supply line 22 and a heavy oil burner 24 are disposed near the center of the upper surface of the dispersion plate 21.
And the like are provided so as to face each other, so that a local high-temperature region a is formed in the central portion immediately above the dispersion plate 21. On the other hand, the granulation / sintering furnace 14c may form a cylindrical portion 14e constituting a free board portion 14d and a downward moving layer b in which the granulated material is lower than the local high temperature region a as indicated by an arrow. And an inverted truncated conical portion (cone portion) 14f having a height substantially equal to the height of the fluidized bed. That is, the granulating / sintering furnace 14c is configured to have both a spouted bed and a fluidized bed. The cone portion 14f formed in the spouted fluidized bed granulation / sintering furnace 14c configured as described above.
The other end of the supply line 19 of the preheated cement raw material powder having the indentation blower 17 at one end is connected to the side wall, and an ejector 32 is provided in the middle of the supply line 19,
A material powder supply chute 68 suspended from the cyclone C ₁ is connected to the ejector 32, and the material powder is removed from the cone portion 14 by the pushing wind action of the pushing blower 17.
The raw material powder blown and supplied is sufficiently diffused in the moving layer b to reach the local high-temperature region a.

FIG. 7 shows an apparatus for manufacturing a cement clinker according to a second embodiment of the present invention. In this embodiment,
A bifurcated chute 58 is connected to the cement clinker outlet 36 of the cooler 20 and clinker A from one chute 60 is connected.
As a product as it is, and the vibrating sieve 40 is connected to the other chute 62 to obtain a granular material having a plurality of particle sizes.
For example, the configuration is such that clinker B having a small particle size and clinker C having a large particle size are classified. Other configurations and operations are the same as those in the first embodiment. In the present embodiment, for example, in the case of producing a low heat cement or a medium heat cement having a low CaO content and an early-strength cement having a large CaO content, a cement raw material powder having a composition such that these products can be produced. Is preliminarily blended and prepared, and a clinker for a low heat generating cement or a clinker for a medium heat cement is classified as a clinker B having a small particle diameter, and a clinker for an early-strength cement is classified as a clinker C having a large particle diameter. At this time, a normal Portland cement clinker having a medium CaO content can be obtained as the clinker A.

FIG. 8 shows an apparatus for manufacturing a cement clinker according to a third embodiment of the present invention. In this embodiment,
The vibrating sieve is a vibrating sieve 40a having three or more stages (FIG. 8).
Here, a case of three stages is shown as an example. ) It is configured to manufacture three or more types of cement clinkers (clinkers A, B, and C as an example in FIG. 8).
In this case, the fine particle outlet 64 for extracting the finest fine particles may be connected to the granulation / sintering furnace 14 via the fine particle transfer line 66. The fine particles may be returned to the preheating raw material powder supply chute 68 on the upstream side of the ejector 32. As described above, fine particles having a size of 0.5 mm or less are already classified and returned to the granulation / sintering furnace 14 at the clinker drop port 23 of the granulation / sintering furnace 14, and are classified by the vibration sieve 40a. The amount of fines is very small. When returning the fine clinker C to the granulating and firing furnace 14, the vibrating sieve 40a classifies the cement clinker B having a large particle diameter, the cement clinker A having a small particle diameter, and the cement clinker C having a fine particle diameter of 0.5 mm or less. . Since the fine particles having a diameter of 0.5 mm or less are not sufficiently granulated and fired, they are returned to the granulating and firing furnace 14 and granulated and fired, thereby improving the quality and stabilizing the clinker. Other configurations and operations are
This is the same as in the first and second embodiments.

FIG. 9 shows an apparatus for manufacturing a cement clinker according to a fourth embodiment of the present invention. In this embodiment,
Granular material transfer means (for example, a screw conveyor) 70, 72, feeders (for example, rotary valves) 74, 76, and auxiliary granular material transfer means (for example, a screw conveyor) 73 at each of the classified material outlets 42, 44 of the vibrating sieve 40. The clinker hoppers 46 and 48 for temporarily and separately storing the respective classified materials are connected via the respective hoppers. Weight sensors 78 and 80 are respectively provided in the clinker hoppers 46 and 48, and these weight sensors 78 and 80 and the feeder 74 are provided. , 76 are connected to the respective clinker hoppers 46, 48 via a control line having a ratio setting device 85 so that the motors 82, 84 can be controlled by the values of the weighing scales 86, 88. It is configured so that each of the classified materials has a constant weight ratio. In the present embodiment, the weight sensors 78, 80 can detect how much clinker has entered per hour when the clinker has not been discharged from the clinker hoppers 46, 48, and the value indicates the rotation of the electric motors 82, 84. By controlling the number, even if the classification amount of the cement clinker A having a small particle diameter and the classification amount of the cement clinker B having a large particle diameter fluctuate, the clinker A, B is targeted to the respective clinker hoppers 46, 48. At a rate of

For example, when the cement raw material powder is used as a raw material compound necessary for obtaining a plurality of product types and production amounts,
As an example, as shown in Table 1, it is assumed that portland cement (PC) and early-strength cement (HC) are to be manufactured at a weight ratio of 2: 1.

[0021]

[Table 1]

In this case, the required amount of the raw material powder is 3 (= 2 +
In 1), the composition corresponds to the weighted average of the composition of Portland cement to be obtained and the composition of the early-strength cement. When such necessary raw material powder is compounded, as shown in FIG. 11, a predetermined amount of limestone, clay, silica stone, iron slag, or the like is dried through a conveyor 90 through a dryer (for example, a rotary hot air dryer). The dried product is supplied to a dryer 92 and dried. The dried product is introduced into a pulverizer 94 to be pulverized, and the pulverized product is conveyed by air to a solid-gas separator 96 such as a cyclone to be separated into raw material powder and exhaust gas. Air blending silo with powder 98
After being supplied and pressurized air is supplied and agitated and homogenized, the raw material is supplied as cement raw material powder from a raw material charging chute 26 (see FIG. 9) into the apparatus system.

In FIG. 9, when the cement clinker produced from the cement raw material powder blended and prepared as described above is classified, clinker A having a small particle size corresponds to a clinker for Portland cement, and clinker having a large particle size. B corresponds to the clinker for the early-strength cement. Clinker A
When the ratio of clinker B to clinker B is 2: 1 (weight ratio), it may be transferred to clinker hoppers 46 and 48 as they are, but the ratio between clinker A and clinker B fluctuates due to fluctuations in operating conditions and the like. Sometimes. For example, when the ratio of clinker A to clinker B is 2.5: 0.5 (weight ratio), 1
Of the 2.5 clinkers A supplied to the stage granular material transfer means 70, 2.0 clinkers A are supplied to the clinker hopper 46 via the feeder 74, and the remaining 0.5 clinkers A are supplied. It is charged into the second-stage granular material transfer means 72. The 0.5 clinker B charged to the second-stage particulate transfer means 72
Is supplied to the clinker hopper 48 via the feeder 76 together with the clinker A of 0.5.

When the ratio of clinker A to clinker B is 1.5: 1.5, the first-stage granular material transfer means 70
Is supplied to the clinker hopper 46 via the feeder 74. Among the 1.5 clinkers B supplied to the second-stage granular material transfer means 72, 1.
Clinker B is supplied to clinker hopper 4 via feeder 76.
8, the remaining 0.5 clinker B is supplied to the third-stage auxiliary granular material transfer means 73, and is supplied to the clinker hopper 46 from the auxiliary granular material transfer means 33. In this way, even if the ratio between clinker A and clinker B fluctuates,
Clinker A and clinker B can be charged into clinker hoppers 46 and 48 at a ratio of 2: 1 (weight ratio). Other configurations and operations are the same as those in the first to third embodiments.

FIG. 10 shows an apparatus for manufacturing a cement clinker according to a fifth embodiment of the present invention. In the present embodiment, each classified material is separately supplied to each of the classified material outlets 42 and 44 of the vibrating sieve 40 via granular material transfer means (for example, a screw conveyor) 70 and 72 and feeders (for example, rotary valves) 74 and 76. Are connected to the clinker hoppers 46 and 48, and the clinker hoppers 46 and 48 are respectively provided with weight sensors 78 and 80. These weight sensors 78 and 80 and the electric motors 82 and 84 of the feeders 74 and 76 are connected to the clinker hoppers 46 and 48, respectively. Is connected via a control line provided with a ratio setting device 85 so that the electric motors 82 and 84 can be controlled by the values of the weighing scales 86 and 88, so that each of the classified materials supplied to each of the clinker hoppers 46 and 48 is fixed. It is configured to have a weight ratio. In the present embodiment, the weight sensors 78, 80 can detect how much clinker has entered per hour when the clinker has not been discharged from the clinker hoppers 46, 48, and the value indicates the rotation of the electric motors 82, 84. By controlling the number, even if the classification amount of the cement clinker A having a small particle diameter and the classification amount of the cement clinker B having a large particle diameter fluctuate, the clinker A, B is targeted to the respective clinker hoppers 46, 48. At a rate of Other configurations and operations are the same as those in the fourth embodiment.

[0026]

As described above, the present invention has the following effects. (1) Since a plurality of types of cement clinkers having a predetermined mineral composition can be manufactured from the same raw material powder with the same apparatus of one furnace system, loss accompanying switching of cement types is eliminated, and cost reduction is achieved. be able to. (2) The ratio of the cement clinker production amount can be adjusted by adjusting the raw material powder composition. (3) In the case where fine particles of 0.5 mm or less are classified at the clinker drop port and returned to the granulating / firing furnace, the quality of the cement clinker is further improved and stabilized.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing an apparatus for manufacturing a cement clinker according to a first embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view of the granulation / sintering furnace in FIG. However, illustration of the fluidized bed is omitted.

FIG. 3 is a schematic vertical sectional view showing another example of the granulating / firing furnace and the cooler in FIG.

FIG. 4 is a schematic vertical sectional view showing another example of the granulating / firing furnace and the cooler in FIG.

FIG. 5 is a schematic longitudinal sectional view showing still another example of the granulating / firing furnace in FIG.

FIG. 6 is a sectional view taken along line AA in FIG. However,
Illustration of the spouted fluidized bed and the moving bed is omitted.

FIG. 7 is a flow sheet showing an apparatus for manufacturing a cement clinker according to a second embodiment of the present invention.

FIG. 8 is a flow sheet showing an apparatus for manufacturing a cement clinker according to a third embodiment of the present invention.

FIG. 9 is a flow sheet showing an apparatus for manufacturing a cement clinker according to a fourth embodiment of the present invention.

FIG. 10 is a flow sheet showing an apparatus for manufacturing a cement clinker according to a fifth embodiment of the present invention.

FIG. 11 is a flow sheet showing an apparatus for mixing and preparing raw material powder used in the apparatus for manufacturing a cement clinker of the present invention.

[Explanation of symbols]

C ₁ -C ₄ cyclone 10 Suspension preheater 12 Calcination furnace 14, 14a, 14b, 14c Granulation / sintering furnace 14d Free board part 14e Cylindrical part 14f Cone part 17 Push-in blower 18, 18a Primary cooler 19 Preheat cement raw material powder Supply line 20 cooler 20a, 20b secondary cooler 21 gas dispersion plate 22 pulverized coal fuel supply line 23 clinker drop port 24 heavy oil burner 25 gate 26 raw material input chute 27, 30 airtight discharge device 28 discharge chute 31 for classification and cooling Air blower pipe 32 Ejector 33 Fluidized bed 35 Throat 36 Cement clinker outlet 37 Pulse air supply pipe 38 Discharge groove 39 Nozzle 40, 40a Vibrating sieve 42, 44 Classifier outlet 46, 48 Clinker hopper 58 Bifurcated chute 60 One chute 62 Chute 64 Fine particle outlet 66 Fine particle transfer line 68 Preheating raw material supply chute 70, 72 Granular material transfer means 73 Auxiliary granular material transfer means 74, 76 Feeder 78, 80 Weight sensor 82, 84 Motor 85 Ratio setter 86, 88 Weight Total 90 Conveyor 92 Dryer 94 Crusher 96 Solid-gas separator 98 Air blending silo

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiyuki Ishibachi 1-chome, Midami-shiro-cho, Chiyoda-ku, Tokyo Sumitomo Osaka Cement Co., Ltd. (72) Inventor Isao Hashimoto 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe-shi No. Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Shozo Kanamori 3-1-1 Higashi Kawasaki-cho, Chuo-ku, Kobe City Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Mikio Murao Higashi-Kawasaki-cho, Chuo-ku, Kobe City 3-1-1, Kawasaki Heavy Industries, Ltd. Kobe Plant

Claims (10)

[Claims] 1. A preheated cement raw material powder is introduced into a fluidized-bed or spouted-bed type granulating / firing furnace for granulation / firing, and then the granulated / firing product is introduced into a cooler for cooling. A method of producing a cement clinker, comprising: classifying the cement clinker from a cooler into granules having at least two types of particle diameters to obtain at least two types of cement clinkers having different mineral compositions. Production method. 2. The method for producing a cement clinker according to claim 1, wherein each of the classified particles is put into a separate clinker hopper. 3. The cement clinker according to claim 2, wherein the at least two types of cement clinker are coarse particles and fine particles, and the amount of the clinker supplied to the clinker hopper is controlled so that the coarse particles and the fine particles have a predetermined ratio. Manufacturing method. 4. The method for producing a cement clinker according to claim 1, wherein fine particles having a size of 0.5 mm or less are classified at a discharge portion of the granulating / firing furnace, and the fine particles are returned to the granulating / firing furnace. 5. The cement raw material powder is a raw material compound necessary for obtaining a plurality of product types and production amounts.
The method for producing a cement clinker according to any one of the above. 6. A suspension preheater for preheating cement raw material powder, a calciner for calcining the preheated cement raw material powder, and a fluidized bed or spouted bed type for granulating and calcining the calcined cement raw material powder. A cement clinker manufacturing apparatus comprising: a granulating / sintering furnace; and a cooler for cooling the granulated / sintered product from the granulating / sintering furnace, a cement clinker from a cooler is provided at a cement clinker outlet of the cooler. Characterized in that a classifier for classifying at least two kinds of particles having different particle diameters is connected. 7. The cement clinker manufacturing apparatus according to claim 6, wherein the classifier is a vibrating sieve. 8. The cement clinker manufacturing apparatus according to claim 7, wherein a separate clinker hopper is connected to each classifier outlet of the vibrating sieve. 9. A bifurcated portion is connected to a cement clinker outlet of a cooler, and one of the bifurcated portions is used as a product outlet, and the cement clinker is classified into at least two types of granular materials at the other of the bifurcated portions. 9. The cement clinker manufacturing apparatus according to claim 7, further comprising a vibrating sieve connected to the cement clinker. 10. A clinker hopper for separately storing each classified material is connected to each of the classified material outlets of the vibrating sieve via a granular material transferring means and a feeder, and a weight sensor is provided for each clinker hopper. And the electric motor of the feeder are connected via a ratio setting device so that the electric motor can be controlled by the value of the weighing scale, so that each classified material put into each clinker hopper has a constant weight ratio. Item 10. An apparatus for producing a cement clinker according to item 8 or 9.