JPH0733269B2 - 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. 4, 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, and the other parts are sent 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.

The present invention solves the above problems and provides a comprehensive energy-saving effect, and by crushing to a grain size within the grain size constituting region, the strength development as concrete is enhanced and good workability is obtained. An object of the present invention is to provide a crushing device such as a new cement clinker.

[0005]

According to the present invention, a case 18 is provided.
And a table 11 that is driven to rotate about a vertical rotation axis in the case 18, and a roller 12 that is pressed against the table 11, and the raw material to be crushed is introduced just above the rotation axis of the table 11. A roller mill 10 in which a raw material charging port 14 is formed and a crushed material discharge port 15 is opened on the lower side of the table 11, and a separator 21 for classifying the crushed material crushed by the roller mill 10 into coarse powder and fine powder.
And a tube mill 20 to which coarse powder from the separator 21 is supplied, the crushed product crushed by the tube mill 20 is returned to the separator 21, and the fine powder from the separator 21 is used as a product. Etc. is a crushing device.

The present invention also includes a case 18 and a case 18
A table 11 that is driven to rotate around a vertical rotation axis
And a roller 12 pressed against the table 11,
A raw material feeding port 14 for feeding a raw material to be crushed is formed right above the rotation axis of the table 11, and the table 1
1, a roller mill 10 having a pulverized material discharge port 15 opened on the lower side thereof, a first separator 21 for classifying the pulverized material pulverized by the roller mill 10 into coarse powder and fine powder, and fine powder from the first separator 21. Tube mill 20 supplied with
The second separator 19 is provided above the table 11 in the case of the roller mill 10, and the coarse powder generated by the second separator 19 is returned to the table 11 to remove the fine powder from the second separator 19. Dust collector 2 to collect
4 is provided and the fine powder from the first separator 21 and the fine powder from the dust collector 24 are mixed to obtain a product, which is a crushing device for cement clinker or the like.

[0007]

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 the separator, the fine powder is made into a product, and the coarse powder is supplied to the 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, according to the present invention, in addition to the first separator 21 for classifying the pulverized material from the discharge port 15 opened on the lower side of the table 11 of the roller mill 10, a second separator 19 is provided in the case of the roller mill 10. , The coarse powder from the second separator 19 is returned to the table 11, and the fine powder from the second separator 19 is small, and such a small amount of fine powder is conveyed by air and collected by the dust collector 24. To do. By collecting the fine powder by the second separator 19 in this manner, the fine powder undesirably scattered from the first separator 21 can be reduced, and the coarse powder from the second separator 19 can be pulverized again by the roller mill 10. ,
The grinding efficiency can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is a system diagram showing a cement clinker crushing device according to an embodiment of the present invention, and FIG. 2 is a block diagram thereof. This apparatus is composed of a primary crushing step 1 and a secondary crushing step 2 along the direction of the clinker flow. A roller mill 10 is used in the primary crushing step 1 and a secondary crushing step 2
The tube mill 20 is used for this. 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 of the flow, and the separator 2 is connected to the bucket elevator 23.
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 thrown into the roller mill 10 which is the primary crushing process 1 from the raw material charging port 14 and crushed. A part of the crushed product by the primary crushing process, for example 80% or more, is attracted to the attracting fan 25. Without passing through the gap between the inner surface of the case 18 and the rotary table, and as the primary pulverized product B ₁ , the lower discharge port 1 of the mill 1
It is taken out from No. 5 and put into the bucket elevator 23. Granules are adjusted in the primary pulverized product B ₁ by adjusting the gas flow from a gas blowing nozzle (not shown) provided in the roller mill. In addition, the fine powder C of the pulverized product is attracted to the attracting fan 25 to be discharged from the fine particle outlet 16 to the dust collector 2
It is sent to 4 and collected. Reference numeral 13 shown in FIG. 1 is a scraper, 17 is a motor for driving the rotary table 11, and 17 is a motor.
a is a speed reducer.

The primary pulverized material B ₁ sent to the secondary pulverizing 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 outlet 21a as the product A ₁ , and the remaining coarse powder is supplied to the lower tube mill 20 as the tertiary pulverized product B ₃ . In the tube mill 20 to which the above-mentioned tertiary pulverized product B ₃ is supplied from the supply port 20a,
The coarse powder is lifted along with the balls along the inner wall by the rotation of the mill body, and is crushed by the impact force and frictional force caused by the balls colliding and the balls contact each other when rolling and dropping. Fourth pulverized product B ₄ by this tube mill 20
Is taken out from the discharge port 20b and the bucket elevator 23
Returned to the secondary crushed product B together with the above-mentioned primary crushed product B _1.
It is again introduced as ₂ into the separator 21. The fine powders C, C contained in the attracted gas from the separator 21 or in the bleed air from the tube mill 20 are connected to the conduit 40 via the conduits 41 and 42, respectively, and guided to the dust collector 24. In the secondary crushing step 2, the above circulation is repeated to ensure an appropriate particle size. Dust collector 24 via the conduits 40, 41, 42
The fine powder C that has been collected and collected in the above manner becomes the final product A which is 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 the conduit 41.
Be led to.

The system diagram of FIG. 3 shows another embodiment. As shown in the figure, a separator 19 is provided in the roller mill 10, the raw material inlet 14 is provided at the upper side of the case 18, and its lower end is opened immediately above the rotation axis of the table 11. Therefore, the raw material can be uniformly dropped and supplied onto the rotary table 11. According to this structure, a part of the pulverized material in the primary pulverizing step is classified by the separator 19, and the fine powder is guided to the dust collector 24 through the conduit 40.

According to this embodiment, the coarse powder from the separator 19 is pulverized again in the roller mill 10 to improve the pulverization efficiency of the roller mill 10. Moreover, the fine powder from the separator 19 is transported by air and collected by the dust collector 24. However, this is limited to only the fine powder, and since the amount of the fine powder is small, air transportation energy required for air transportation is slightly consumed. Moreover, since the fine powder from the first separator 21 and the fine powder from the dust collector 24 are mixed into a product,
It does not change the grain size composition of the product.

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.

[0015]

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.

Further, 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, the pulverized material from the roller mill in the above-mentioned prior art is entirely discharged and guided to the separator 21 from the discharge port 15 opened on the lower side of the table 11 of the roller mill. The required power can be greatly reduced compared to the configuration in which the entire amount is pneumatically conveyed. 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 invention,
Since 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,
The particle size of the product, which is a fine powder, becomes uniform, and a product suitable as cement can be obtained. Furthermore, according to the present invention, the first separator 2 through which the pulverized material from the discharge port 15 of the roller mill is guided.
In addition to 1, the second separator 19 is provided in the case of the roller mill 10, and the coarse powder produced by the second separator 19 is returned to the table 11 for re-grinding.
The pulverization efficiency of the roller mill can be improved, and the amount of fine powder that is conveyed by air from the second separator 19 can be extremely small, and the fine powder that is conveyed by air from the second separator 19 can be collected by the dust collector 24. Since the product is prepared by mixing it with the fine powder from the first separator 21, the energy required for pneumatic transportation may be very small, and the particle size of the product should be a value suitable for cement clinker and the like. You can Further, as described above, in the first separator 21, the pulverized product after the fine powder is removed by the second separator 19 is guided, and therefore, the amount of fine powder undesirably scattered from the first separator 21 can be reduced. It also has an excellent effect.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram of an example.

FIG. 3 is a block diagram showing another embodiment.

FIG. 4 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 7 No. 1134, Goto Hijimoto Shuji Hashimoto 1311, Ishihara, Kumagaya, Saitama (56) References 52-95371 (JP, A) JP 58-125648 (JP, A) JP 58-161955 (JP, A) JP 60-231447 (JP, A)

Claims (2)

[Claims] 1. A table 11 comprising a case 18, a table 11 which is rotationally driven in the case 18 around a vertical rotation axis, and a roller 12 which is pressed against the table 11.
A raw material input port 14 for inputting a raw material to be crushed is formed immediately above the rotation axis of the roller mill 10, and a crushed material discharge port 15 is opened in the lower part of the table 11, and the roller mill 10 is crushed by the roller mill 10. Including a separator 21 for classifying the crushed product into coarse powder and fine powder, and a tube mill 20 to which the coarse powder from the separator 21 is supplied. The crushed product crushed by the tube mill 20 is returned to the separator 21, and the separator 21 A crushing device for cement clinker, etc., characterized by using fine powder from 2. A table 11 comprising a case 18, a table 11 which is driven to rotate about a vertical rotation axis in the case 18, and a roller 12 which is pressed against the table 11.
A raw material input port 14 for inputting a raw material to be crushed is formed immediately above the rotation axis of the roller mill 10, and a crushed material discharge port 15 is opened in the lower part of the table 11, and the roller mill 10 is crushed by the roller mill 10. A first separator 21 for classifying the pulverized material into coarse powder and fine powder; and a first separator 21.
The second separator 19 is provided above the table 11 in the case of the roller mill 10 including the tube mill 20 to which the fine powder from the second separator 19 is supplied.
The dust collector 24 that collects the fine powder from the second separator 19 is provided so as to return the coarse powder from the table 11 to the table 11, and the fine powder from the first separator 21 and the fine powder from the dust collector 24 are mixed to obtain a product. A crushing device for cement clinker, etc.