JPH0777975B2 - Crushing equipment such as cement clinker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a crusher for cement clinker and the like.

[0002]

Cement is manufactured by compounding clinker produced in the firing step with gypsum and, if necessary, additives such as slag and crushing. For crushing such cement clinker, conventionally, the roller and the table are rotated while being pressed against each other, and the table is rotated to crush the clinker in the case. In, a tube mill configured to apply frictional force or impact force to balls to crush the clinker in the tube is used. Generally, a roller mill has a relatively excellent coarse crushing function, and a tube mill is efficient for fine crushing. Therefore, by properly combining and using these two mills, the particle size constituting region of the product is expanded, the quality is improved, and a great effect is exerted on the overall energy saving aspect. JP-A-58-125648 discloses a combination of two such mills.
And JP-A-58-161955 are known.

[0003]

In the prior art disclosed in the above publication, however, as shown in FIG. 7, the crushed material by the roller mill 10 for the primary crushing process is the carrier air provided below the mill. The high-pressure air sent from the intake port 19 conveys it to the collector 31 via the extraction port 11, and part of it remains as a product via the distributor 32, while the other parts are fed to the tube mill 20 which is the secondary crushing process. I am trying to be crushed. For this reason, the power (air amount × pressure loss) for air transportation with respect to the pulverized material in the roller mill 10 is large. Further, in order to convey by air, it is necessary to pulverize more finely than necessary in the primary crushing step, and the particle size after the primary crushing is thus determined, so the work ratio between the primary crushing step and the secondary crushing step There is no room to adjust. That is, when the roller mill 10 and the tube mill 20 are combined, there is an appropriate particle size distribution for maintaining the best overall work efficiency by making use of the advantages of both mills.
Since the particle size of the pulverized product to be pulverized is limited, it is impossible to set an appropriate work ratio. Therefore, there is a problem that it is difficult to distribute the work amount between both crushing processes for energy saving.

An object of the present invention is to solve the above-mentioned problems, to obtain a comprehensive energy saving effect, to grind to a particle size within a particle size constituting region, and to improve the grinding efficiency in a roller mill.

[0005]

The present invention is directed to a roller mill 1.
0 is used for the primary pulverization step 1 and the tube mill 20 is used for the secondary pulverization step 2, and the pulverized product taken out below the table of the roller mill 10 is guided to the separator 21 for classification, and after classification. Is a product, part of the coarse powder after classification is returned to the roller mill 10 and the rest is supplied to the tube mill 20, and the pulverized product crushed by the tube mill 20 is again guided to the separator 21 for classification. It is a crushing device for cement clinker and the like. The present invention also includes a primary crushing step 1 using a roller mill 10,
The secondary crushing step 2 using the tube mill 20 is performed. The crushed product taken out below the table of the roller mill 10 is supplied to the tube mill 20, and the crushed product crushed by the tube mill 20 is transferred to the separator 21. A part of the coarse powder after being guided and classified and classified by the separator 21 is supplied to the tube mill 20, the rest of the coarse powder is returned to the roller mill 10, and the fine powder after classification is a product. This is a crushing device for cement clinker. Further, the present invention comprises a primary crushing step 1 using the roller mill 10 and a secondary crushing step 2 using the tube mill 20, and the crushed product taken out below the table of the roller mill 10 is transferred to the tube mill 20. The pulverized material supplied and pulverized by the tube mill 20 is guided to the separator 21 and classified, and the total amount of the coarse powder classified by the separator 21 is returned to the roller mill 10, and the fine powder after classification is made into a product. This is a crushing device for cement clinker and the like.

[0006]

The present invention is a crushing apparatus which uses a combination of a primary crushing step using a roller mill having an excellent coarse crushing function and a secondary crushing step using a tube mill having a high fine crushing efficiency. The pulverized pulverized product is classified by a separator, fine powder is made into a product, and coarse powder is separately supplied to a roller mill and a tube mill and pulverized. Compared to the above-mentioned prior art in which the entire amount of the pulverized material from the roller mill is pneumatically conveyed, the present invention does not require a fan of high power, and the required power can be reduced. It is not necessary to grind more finely than necessary with a roller mill for air transportation in, and the sharing of the grinding work between the roller mill and the tube mill can be determined so as to increase efficiency, and further, fine powder is put into the tube mill. Since it does not exist, over-pulverization is prevented, the pulverization efficiency is improved, and the coarse powder from the tube mill is returned to the separator, which homogenizes the particle size of the fine powder from the separator, which is suitable for cement. It can be a distribution.

Further, in the present invention, it is important that a part of the coarse powder in the secondary pulverization step is supplied to the tube mill, and the remaining coarse powder is returned to the roller mill and re-pulverized.

Particularly according to the present invention, as described in claims 1 to 3, the pulverized material from the roller mill 10 or the tube mill 20 is guided to the separator 21 and classified, and the coarse powder after the classification is obtained. A part or the whole amount is returned to the roller mill 10, and the coarse powder after classification from the separator 21 is smaller than the particle size of the cement clinker or the like newly supplied to the roller mill 10. It is possible to reduce the layer thickness displacement ΔT = T−t between the upstream side layer thickness T to be crushed and crushed and the layer thickness t immediately after crushed and crushed. Therefore, the vibration generated between the table 11 and the roller 12 is suppressed.

In other words, it is possible to increase the bulk specific gravity of the crushed material caught between the table 11 and the roller 12,
It is possible to reduce the porosity of the pulverized material, and thus to significantly reduce vibration.
Bulk specific gravity is also called volume.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing a crusher for cement clinker which is a premise of the present invention, and FIG. 2 is a block diagram thereof. This device comprises a primary crushing step 1 and a secondary crushing step 2 along the direction of clinker flow. A roller mill 10 is used for the primary crushing step 1 and a tube mill 20 is used for the secondary crushing step 2. ing. The roller mill 10 is provided with a raw material inlet 14 formed directly above the rotation axis of the rotary table 11 in the ceiling portion 18a of the case 18, and a bleeding outlet 16 adjacent to the side of the raw material inlet 14, and on the lower side thereof. The crushed material discharge port 15 is opened. The raw material input port 14 may be provided so as to project into the case 18 by a vertically extending cylindrical body.

In the secondary crushing step 2, the bucket elevator 23 is arranged on the most upstream side along the flow, and then the separator 2 is arranged.
1 is provided. A tube mill 20 is provided below the separator 21, and an outlet 20b thereof is connected and opened to a lower inlet 22 of the bucket elevator 23. In addition to the above, the secondary crushing step 2 includes a dust collector 24 and an induced draft fan 25, which are separated via the conduit 41 from the separator 21.
Is attracting exhaust. Further, the guide pipe 41 is also connected to conduits 40 and 42 for discharging the bleed air mixed with the fine powder from the bleed ports of the roller mill 10 and the tube mill 20.

The cement clinker is installed from the raw material inlet 14
The powder is put into the roller mill 10 as the next crushing step 1 and crushed.
0% or more is not attracted to the induction fan 25,
It falls through the gap between the inner surface of the case 18 and the rotary table, is taken out from the lower discharge port 15 of the mill as the primary pulverized product B ₁ , and is put into the bucket elevator 23. 1
The particle size of the next pulverized product B ₁ is adjusted by adjusting the gas flow from a gas blowing nozzle (not shown) provided in the roller mill. In addition, the fine powder C among the pulverized products is attracted to the draft fan 25 and sent to the dust collector 24 from the fine powder outlet 16 to be collected. Reference numeral 13 shown in FIG. 1 is a scraper,
Reference numeral 17 is a motor for driving the rotary table 11, and 17a is a speed reducer.

The primary crushed material B ₁ sent to the secondary crushing step 2 is conveyed upward by the bucket elevator 23 and dropped into the separator 21. Separator 21
The fine powder classified in ( ₁₎ is taken out from the take-out port 21a as a product A ₁ , and a part of the classified coarse powder is supplied to the lower tube mill 20 as a tertiary pulverized product B ₃ .

In one embodiment of the present invention, the separator 2 is omitted in the configuration shown in FIGS.
The rest of the coarse powder classified in 1 is returned to the roller mill 10,
Re-ground. Thus, the coarse powder B from the separator 21
_By returning the remainder of ₃ to the roller mill 10, the coarse powder B ₃ is mixed in the pulverized product with many voids in the roller mill 10, and the voids of the pulverized product are significantly reduced. Vibration and noise are suppressed, and crushing efficiency is improved.

In the tube mill 20 to which a part of the tertiary pulverized product B ₃ is supplied from the supply port 20a, coarse powder is lifted along with the balls along the inner wall thereof by the rotation of the mill body and the balls roll and fall. At the time, the balls are crushed by the impact force and the friction force caused by the collision between the balls and the mutual contact of the balls. The fourth pulverized product B _{4 from} this tube mill 20 is discharged from the discharge port 20.
It is taken out from b and returned to the bucket elevator 23, and is again introduced into the separator 21 as the secondary ground material B ₂ together with the above-mentioned primary ground material B ₁ . The fine powders C and C contained in the attracted gas from the separator 21 or in the bleed air from the tube mill 20 are connected and guided to the conduit 40 via conduits 41 and 42, respectively, and reach the dust collector 24. In the secondary crushing process 2,
The above circulation is repeated to ensure proper particle size.

The dust collector 2 is passed through the conduits 40, 41 and 42.
The fine powder C captured and accumulated in 4 becomes the final product A mixed with the crushed product A ₁ taken out from the separator 21 as the crushed product A ₂ . According to this method, the fine powder of the powder entering the tube mill 20 is removed by the separator 21 in advance, so that over-milling in the tube mill 20 is prevented and the overall milling efficiency is improved. When the separator has a circulation fan, a part of the circulation gas is extracted as conduit 4
Guided to 1.

In FIG. 3, a part A ₃ of the primary crushed product B ₁ taken out below the roller mill 10 in the primary crushing process 1 becomes a part of the product as it is, and the rest is fed to the secondary crushing process 2. The block diagram which shows the other structure used as the premise of this invention. This flow is suitable for increasing the number of particles on the coarse powder side.

Also in the configuration shown in FIG. 3,
In another embodiment of the present invention, similarly to the above-mentioned embodiments, a part of the coarse powder B ₃ classified by the separator 21 is supplied to the tube mill 20, and the rest is the roller mill 1.
Returned to 0.

The system diagram shown in FIG. 4 shows the secondary crushing step 2
Fig. 6 shows still another configuration which is a premise of the present invention in which the arrangement of each machine in the inside is changed, and the tube mill 20 of the closed circuit system is arranged downstream of the roller mill 10 to directly receive the primary pulverized product B ₁ . The bucket elevator 23 is connected to the tube mill 20.
It is arranged on the downstream side of.

According to yet another embodiment of the present invention, FIG.
As shown in the block diagram of the embodiment according to the present invention in FIG. 5, a part of the coarse powder, which is the tertiary pulverized product B ₃ from the separator 21 in the configuration of FIG. The rest is returned to the roller mill 10 and re-ground.

As another embodiment of the present invention, in the structure shown in FIG. 4, all the coarse powder from the separator 21 is returned to the roller mill 10 and pulverized again.

FIG. 6 is a block diagram showing another embodiment of the present invention. In the embodiment of FIG. 6, a part A ₃ of the primary ground product B ₁ in the structure of FIG. 4 is a part of the product A. Other configurations are similar to those of the embodiment shown in FIG.

In the roller mill 10, the scraper 13
Instead of being discharged by, the crushed material may be directly taken out below the rotary table 11 by a chute.

[0025]

As described above, the present invention comprises the primary crushing step using the roller mill and the secondary crushing step using the tube mill along the flow, and the crushed particles are crushed in the primary crushing step. At least a part of the material is taken out below the table of the roller mill and is fed to the next secondary crushing step 2, so that the advantages of each mill can be utilized and there is an overall energy saving effect. It is sufficient to simply install an additional roller mill on the upstream side of the pulverization process using the tube mill of. Moreover, power required for pneumatic transportation is extremely small, and energy consumption is significantly reduced as compared with the conventional method. Moreover, the adjustment of the particle size composition is extremely easy to perform, and the characteristics of each mill can be fully utilized. Further, by adjusting the flow velocity of the blown gas in the roller mill, the particle size of the pulverized product taken out below the rotary table of the mill can be easily adjusted, so that the work distribution in each of the primary and secondary pulverization processes is optimized. In addition, the energy saving effect can be enhanced.

According to the present invention, the separator 21 is provided in the secondary crushing process. Therefore, after pulverizing with a roller mill as a primary pulverizing step, the produced fine powder is classified with a separator and removed as a product, only coarse powder can be fed into a tube mill and pulverized. Excessive crushing is prevented, the crushing efficiency of the crushing system consisting of these roller mills and tube mills is improved, and the crushing capacity is further enhanced in combination with the adoption of the roller mill as the primary crushing step.

In particular, according to the present invention, since the crushed material is discharged from the discharge port 15 opened on the lower side of the table 11 of the roller mill and guided to the separator 21, the crushing from the roller mill in the above-mentioned prior art is performed. The required power can be greatly reduced as compared with the configuration in which the entire amount of the object is conveyed by air.

Further, according to the present invention, the work amount can be shared so that the pulverization efficiency of the roller mill and the tube mill is improved.

Further, according to the present invention, the pulverized product from the tube mill is returned to the separator 21, and the fine powder from the separator 21 is used as a product, so that the product which is a fine powder has a uniform particle size and is suitable as a cement. The product is obtained.

Further, by returning the coarse powder from the separator to the roller mill, the crushing efficiency in the roller mill is improved, the crushing capacity is increased, and the noise during operation is reduced.

That is, in the present invention, the pulverized material pulverized by the roller mill 10 or the tube mill 20 is guided to the separator 21 and classified, and the coarse powder after being classified by the separator 21 is newly supplied to the roller mill 10. The particle size is smaller than that of the cement clinker and the like. Therefore, when such coarse powder is returned to the roller mill 10, the bulk specific gravity of the crushed crushed product between the table 11 and the roller 12 of the roller mill 10 is increased. It is possible to increase the porosity and to reduce the layer thickness displacement ΔT (= T−t) between the layer thickness T of the crushed material to be crushed and crushed and the layer thickness t immediately after crushed and crushed. become able to. Therefore, the vibration of the table 11 and the roller 12 during the operation of the roller mill 10 can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a system diagram showing a configuration that is a premise of the present invention.

FIG. 2 is a block diagram of the configuration of FIG.

FIG. 3 is a block diagram showing another configuration that is a premise of the present invention.

FIG. 4 is a system diagram showing still another configuration that is a premise of the present invention.

FIG. 5 is a block diagram showing an embodiment of the present invention.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a system diagram showing a conventional configuration.

[Explanation of symbols]

 1 Primary crushing process 2 Secondary crushing process 10 Roller mill 11 Rotary table 14 Raw material input port 15 Lower discharge port 20 Tube mill 21 Separator 24 Dust collector 25 Induction draft fan

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masashi Sawada Inventor Masashi Sawada, Oma-gun, Oma-gun, Saitama, 1134, Goto Yato 7 (72) Inventor, Shuji Hashimoto 1311, Ishihara, Kumagaya, Saitama (56) References 52-95371 (JP, A) JP-A-58-125648 (JP, A) JP-A-58-161955 (JP, A)

Claims (3)

[Claims] 1. A primary crushing step 1 using a roller mill 10.
And the secondary crushing step 2 using the tube mill 20, the crushed product taken out below the table of the roller mill 10 is guided to the separator 21 and classified, and the fine powder after classification is made into a product, and after classification A part of the coarse powder of the above is returned to the roller mill 10 and the rest is supplied to the tube mill 20, and the crushed product crushed by the tube mill 20 is again guided to the separator 21 and classified. Crushing device for etc. 2. A primary crushing step 1 using a roller mill 10.
And the secondary crushing step 2 using the tube mill 20, and the crushed product taken out below the table of the roller mill 10 is
The pulverized material supplied to the tube mill 20 and pulverized by the tube mill 20 is the separator 2
1 is supplied to the tube mill 20 for classification, and a part of the coarse powder after being classified by the separator 21 is supplied to the tube mill 20, and the rest of the coarse powder is supplied to the roller mill
A crushing device for cement clinker, etc., characterized in that the fine powder after return to the class is made into a product. 3. A primary crushing step 1 using a roller mill 10.
And the secondary crushing step 2 using the tube mill 20, and the crushed product taken out below the table of the roller mill 10 is
The pulverized material supplied to the tube mill 20 and pulverized by the tube mill 20 is the separator 2
A crushing device for cement clinker or the like, characterized in that the total amount of the coarse powder after being guided to 1 and classified by the separator 21 is returned to the roller mill 10 and the fine powder after classification is a product.