JP2001316144A - Withdrawing facility for raw material of calcined cement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a withdrawing facility for a base material of a calcined cement wherein the cement base material containing high concentration chlorine is quantitatively withdrawn from a kiln with cooling. SOLUTION: A part of the base material transported through the base material supplying pipe 12 flows into the withdrawing pipe 13 where the material is cooled to a temperature below the melting point of the chlorine-containing component by a water-cooled jacket 18 transferring slowly in the pipe 12. The cooled material is quantitatively discharged outside the facility through a rotary valve 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for extracting calcined cement raw material, and more particularly, to extract a part of a cement raw material flowing through a raw material input pipe connecting a preheater and a cement kiln, thereby obtaining a chlorine concentration in the cement kiln. The present invention relates to a facility for extracting calcined cement raw material for reducing the amount of calcined cement.

[0002]

2. Description of the Related Art A cement kiln for sintering a cement raw material calcined by a preheater at about 1500 ° C. is provided in a cement raw material firing facility. In this cement kiln, a cement clinker is intermediately manufactured by firing a cement raw material after calcining using heavy oil or pulverized coal as a fuel while rotating a horizontal cylindrical kiln shell. By the way, various chlorine components are contained in cement raw materials and fuels. This chlorine component is vaporized by the heat of sintering the cement kiln or the like, and then circulated in a closed system of the cement kiln and the preheater, whereby it is gradually concentrated. Note that this concentration circulation becomes equilibrium in several hours. At this time, if the amount of the chlorine component in the system is large, the amount of the chlorine component contained in the clinker after firing necessarily increases, and the quality of the cement deteriorates. Moreover,
In the system, a chlorine compound having a low melting point, which is a kind of chlorine component, was generated, adhered to the inner wall surface of the preheater, frequently blocked the flow path of the cement raw material, and hindered the operation of the cement kiln.

Therefore, as a conventional technique for solving this,
For example, “Operation method of chlorine bypass facility” described in Japanese Patent Publication No. 11-35354 is known. This is a technology in which a kiln exhaust gas having a high chlorine concentration is extracted out of the system by a chlorine bypass to reduce the amount of chlorine in the system. More specifically, in this method, a part of exhaust gas (around 1100 ° C.) in a cement kiln is cooled down to about 600 ° C. below the melting point of a chlorine compound while passing through a chlorine bypass, and then externally discharged from the chlorine bypass. To the classifier. Here, after classification according to the dust particle diameter, coarse dust (the chlorine content is relatively small) is returned to the cement kiln. on the other hand,
High-temperature exhaust gas containing fine dust (having a large amount of chlorine)
This is a method of cooling again by passing through a gas cooler, and then removing the fine dust with a dust collector. In the case of fine dust, usually, most of the amount of chlorine brought out by dust is included.

[0004]

According to the above-mentioned prior art, chlorine gas is extracted from the chlorine bypass. Therefore, a part of the cement raw material containing a high concentration of this chlorine component is extracted while cooling quantitatively without hindering the operation of the cement kiln, and is effectively used as a raw material such as a solidified cement material. I couldn't.

Therefore, the inventor of the present invention has communicated with a raw material introduction pipe for introducing a cement raw material into a cement kiln with a drawing pipe extending substantially right below, and provided a fixed amount discharging means such as a rotary valve in the middle of the drawing pipe. With this arrangement, it has been found that the cement raw material filled in the extraction pipe and cooled down to a predetermined temperature by gradually descending the inside of the extraction pipe can be discharged in a fixed amount, thereby completing the present invention.

[0006]

An object of the present invention is to provide a calcined cement raw material withdrawing equipment capable of quantitatively extracting a cement raw material containing a high concentration of chlorine while cooling it without interfering with the operation of the cement kiln. To do so. Another object of the present invention is to provide a calcined cement raw material withdrawing facility capable of preventing clogging of a cement raw material in a withdrawal pipe. Still another object of the present invention is to provide a calcined cement raw material withdrawal facility that can pneumatically feed a cement raw material discharged from a withdrawal pipe to a desired place while cooling the same. Subsequently, the present invention relates the extracted cement raw material to a coarse raw material having a low chlorine content,
It is an object of the present invention to provide a facility for extracting calcined cement raw materials that can be classified into fine raw materials having a high chlorine content.

[0007]

According to the first aspect of the present invention, a cement material calcined by a preheater is communicated with a lower part of a material charging pipe for charging the cement material into a cement kiln, and a part of the cement material is externally connected. Withdrawal of calcined cement raw material, comprising: a withdrawal pipe extending substantially vertically downward for extracting to the pipe; and a quantitative discharge means provided in the withdrawal pipe and discharging a constant amount of the cement raw material filled in the withdrawal pipe. Equipment. The cement raw material here is
For example, limestone, clay, quartzite, iron and the like are mixed and pulverized into fine powder. The clay before the preheater is charged is dried by a clay dryer, and then crushed and mixed with other raw materials by a raw material mill. The calcining temperature of the cement raw material by the preheater is 800 to 850 ° C at the outlet temperature.
It is. Exhaust gas is generated during the calcination, and contains NaCl (melting point: 801 ° C.), KCl (melting point: 776 ° C.) which is a kind of chlorine component. These are circulated and concentrated between the cement kiln and the preheater, and as a result, the chlorine concentration of the cement raw material flowing in the raw material input pipe increases.

[0008] The sectional shape of the extraction tube, the length in the tube axis direction,
The tube diameter (inner diameter, outer diameter) and the like are not limited. However, the length of the extraction tube is preferably 5 m or more. If it is less than 5 m, it is not possible to secure a sufficient distance for cooling the cement raw material descending in the pipe. In addition, the lower part of the raw material input pipe here means a lower portion of the raw material input pipe in a cross section when the raw material input pipe is vertically cut. The configuration of the quantitative discharge means is not limited. In short, it is only necessary that the cement raw material filled in the extraction pipe can be discharged at a constant rate. Therefore, the motor may be automated by a drive unit such as various motors or various actuators, or may be a manual type. As a specific example of the quantitative discharge means, there is, for example, a rotary valve.

[0009] The amount of cement material discharged by the quantitative discharge means is not limited. What is necessary is just to discharge a fixed amount at a time. Here, the constant amount means the amount of the discharged cement raw material per unit time. Therefore, this cement raw material may be discharged continuously or may be discharged intermittently.

The invention according to claim 2 is the facility for extracting calcined cement raw material according to claim 1, wherein the extraction pipe is provided with cooling means for cooling the cement raw material in the extraction pipe. The target temperature of the cement raw material is 600 ° C. or lower, which is lower than the melting point of the chlorine component (chlorine compound). This enhances the durability of the equipment. Examples of the cooling device required for this purpose include an air cooling device in which a large number of fins are mounted on the outer peripheral surface of the extraction pipe to cool it with air, and a water cooling device in which a water jacket is mounted on the outer peripheral surface of the extraction pipe. In addition, various heat exchangers can be employed.

According to a third aspect of the present invention, there is provided the calcined cement raw material withdrawal equipment according to the first or second aspect, wherein the withdrawal pipe is provided with an agitator for crushing a lump of the cement raw material in the withdrawal pipe. is there. The agitator is a crusher and crushes a massive cement raw material in the middle of an extraction pipe to make it fine. The type of agitator is not limited. In short, it is only necessary that the mass of the cement raw material can be crushed. The mounting position of the agitator on the extraction pipe is not limited.

According to a fourth aspect of the present invention, there is provided the calcined cement raw material according to any one of the first to third aspects, wherein the extraction pipe is provided with a vibrator for vibrating the extraction pipe. It is an extraction facility. The type of vibrator is not limited. Further, the mounting position of the vibrator on the extraction pipe is not limited. Further, the number of vibrators used is not limited.

According to a fifth aspect of the present invention, there is provided the temporary storage device according to any one of the first to fourth aspects, wherein the extraction pipe is provided with aeration means for injecting compressed air into the extraction pipe. This is a facility for extracting calcined cement raw materials. The type of the aeration means is not limited. Also,
The mounting position of the aeration means on the extraction pipe is not limited. Furthermore, the number of aeration means used is not limited.

According to a sixth aspect of the present invention, the lower end of the extraction pipe is connected to a pneumatic feeding means for feeding the cement raw material discharged from the discharge port at the end of the extraction pipe to the outside by compressed air. A facility for extracting a calcined cement raw material according to any one of claims 1 to 5.
The type of the pneumatic feeding means is not limited. For example, there is a blower device equipped with a compressor. Examples of a destination to which the extracted cement raw material is fed include a dust tank. An inlet thermometer is installed near the material inlet of this dust tank, and an outlet thermometer is installed near the material outlet of the dust tank, and the fan operates based on the temperature data from these thermometers. Then, the temperature of the cement raw material in the dust tank may be controlled.

The invention according to claim 7 is the facility for extracting calcined cement raw material according to claim 6, further comprising a cyclone classifier for classifying the cement raw material pumped by the air pumping means. As a classifier for removing the cement raw material, a classifier having a cyclone with a classification point of about 7 to 18 μm is preferable. According to this classifier,
The chlorine concentration of fine dust having a particle size of 7 to 18 μm or less is set to about 2-2 to the chlorine concentration of coarse dust (particle size exceeding 7 to 18 μm).
A large density difference of 5 times can be provided. Classification by the classifier may be all or a part of the cement raw material to be pumped.

[0016]

According to the present invention, a part of the cement raw material flowing in the raw material input pipe falls into the extraction pipe. The cement raw material thus extracted from the raw material input pipe (hereinafter, referred to as
The extract material is sometimes cooled down to a temperature equal to or lower than the melting point of the chlorine component contained in the extract material while gradually descending in the extraction tube. The extracted raw material cooled to the predetermined temperature is discharged to the outside by a fixed amount by the fixed amount discharging means. As a result, a cement raw material containing a high concentration of chlorine can be quantitatively extracted without hindering the operation of the cement kiln.

In particular, according to the second aspect of the present invention, the cement raw material descending in the extraction pipe is forcibly cooled by the cooling means. Thereby, the extracted raw material can be cooled to a predetermined temperature in a short time. In addition, the length of the extraction pipe can be shortened, whereby the size of the equipment for extracting the calcined cement raw material can be reduced.

According to the third aspect of the present invention, the mass of the cement raw material descending in the extraction pipe is finely crushed by the agitator. As a result, clogging of the cement raw material in the extraction pipe can be prevented.

According to the fourth aspect of the present invention, since the extraction pipe is vibrated by the vibrator, clogging of the cement material in the extraction pipe can be eliminated.

According to the fifth aspect of the present invention, the compressed air is injected into the extraction pipe by the aeration means. Thereby, clogging of the cement raw material in the extraction pipe can be prevented.

According to the sixth aspect of the present invention, the cement raw material discharged from the discharge port of the extraction pipe is pressure-fed to the outside using the compressed air generated by the air pressure feeding means. Therefore, it is possible to pneumatically feed the cement raw material discharged from the extraction pipe to a desired place while cooling.

According to the seventh aspect of the present invention, the cement raw material pumped by the air pumping means is supplied to the cyclone classifier. As a result, the extracted raw material can be classified into a coarse raw material having a small chlorine content and a fine raw material having a large chlorine content.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of a facility for extracting calcined cement raw material according to one embodiment of the present invention. FIG. 2 is a main part configuration diagram of a facility for extracting calcined cement raw material according to another embodiment of the present invention. In FIG. 1, reference numeral 10 denotes a facility for extracting a calcined cement raw material according to one embodiment. The cement sintering facility 10 mainly includes a preheater 1
The cement raw material calcined in 1 is fired by a cement kiln (not shown) through a raw material charging pipe 12. This cement kiln shall produce cement clinker at 90 to 100 t / h.

The preheater 12 preheats a cement raw material pulverized by a raw material mill (not shown) to a predetermined temperature so as to be easily fired by a cement kiln. The preheater 12 is provided with a large number of cyclones mounted on a steel frame base having several floors. The cement kiln has a sideways cylindrical kiln shell that is slightly inclined downward to the downstream side. The refractory is put on the inner wall of the kiln shell. The kiln shell rotates in the circumferential direction (around the axis) and burns the cement raw material from the preheater 12 by burner heating using heavy oil or pulverized coal as a fuel, thereby intermediately producing a cement clinker.

An extraction pipe 13 is communicated with the raw material introduction pipe 12 in the middle. The extraction pipe 13 is a long circular pipe having a length of about 10 m and a pipe axis direction directed vertically downward. In the middle of the extraction pipe 13, aeration means 14 for sequentially injecting high-pressure compressed air into the pipe toward the lower end of the pipe, a manual shutter damper 15 for shutting off the pipe when cleaning the inside of the pipe, and the like. An upper vibrator 16 for vibrating the upper part of the extraction pipe 13;
An upper thermometer 17 for measuring the temperature in the upper part of the pipe, a water cooling jacket (cooling means) 18 for cooling the cement material passing through the center of the extraction pipe 13, and a lower temperature for measuring the temperature in the lower part of the extraction pipe 13. 19, an agitator 20 for crushing a lump of cement material in the tube, a lower vibrator 21 for vibrating the lower part of the extraction tube 13, and a rotary valve (a fixed amount) for discharging a fixed amount of the cement material filled in the tube. Discharge means) 22 and extraction pipe 1
An ejector (pneumatic feeding means) 23 provided at a discharge port at the lower end of 3 is disposed. Hereinafter, these will be described in detail.

The aeration means 14 has a small compressor. The compressed air generated by this compressor is injected into the pipe of the extraction pipe 13 from a number of injection holes formed at the upper end of the extraction pipe 13. The injected compressed air prevents clogging of the cement raw material in the pipe. A part of the compressed air is also injected into the shutter damper 15 as needed. This is to prevent the cement raw material from adhering to the movable portion of the shutter damper 15 and to reduce the mobility of the damper 15. The upper vibrator 16 includes an upper thermometer 17
It is designed to operate when the temperature of this raw material before being cooled by the water cooling jacket 18 measured by the method described above becomes 700 ° C. or less. On the other hand, the lower vibrator 21
Is the water-cooled jacket 1 measured by the lower thermometer 19
It is designed to operate when the temperature of the cement raw material after cooling in Step 8 is below 300 ° C.

The water cooling jacket 18 has a cooling water supply port formed at the lower part of the jacket, and a discharge port of water after heat exchange is formed at the upper part of the jacket. The cooling water flowing into the jacket from the supply port exchanges heat with the high-temperature cement raw material while flowing upward in the jacket. The water whose temperature has been raised in this way is discharged to the outside through a discharge port at the top of the jacket. As described above, since the flow of water in the jacket is not downward (the flow of water from the upper portion of the jacket toward the lower portion of the jacket) but is directed upward, the central portion of the extraction pipe 13 covered with the water cooling jacket 18 is formed. Can be cooled evenly. The agitator 20
A plurality of crushing rods 20a arranged in the extraction pipe 13
Is a crusher for crushing a lump of cement raw material existing in the pipe by rotating the crushed material at a predetermined rotation speed by an electric motor. By providing this agitator 20,
The effect of preventing clogging in the extraction tube 13 is further enhanced. Here, the agitator 20 is linked with the constant discharge of the cement raw material by the rotary valve 22.

The rotary valve 22 is rotated at a predetermined speed by an electric motor so that the extraction pipe 1 is rotated.
Ejector 2 dispenses a fixed amount of cement material in the lower end of
3 to be discharged. The emission here is 1t / max.
hr. The ejector 23 is always supplied with compressed air generated by a blower device (pneumatic feeding means) 24. The speed of the compressed air is increased in the ejector 23, and at the same time, the cement raw material discharged from the extraction pipe 13 is taken in. Thereafter, the cement raw material is pumped to the dust tank 25 provided outside. A bag filter 26 is mounted above the dust tank 25. In addition, an inlet-side thermometer 27 is provided near the material inlet of the dust tank 25. Further, a discharge port side thermometer 28 is provided near the raw material discharge port of the dust tank 25. Based on the temperature data from both thermometers 27 and 28, the temperature of the cement raw material in this tank is controlled. The maximum storage amount of the dust tank 25 is 20t.

Next, the operation of the calcined cement raw material extraction equipment 10 will be described. As shown in FIG. 1, the cement raw material is calcined while flowing down each cyclone of the preheater 11. After that, the cement raw material flows into the kiln bottom of the cement kiln via the raw material input pipe 12, and is burned by burner heating in the kiln to be formed into a cement clinker. When the calcined cement raw material is fired in the cement kiln, an exhaust gas containing a chlorine component is generated. The exhaust gas is circulated and concentrated between the cement kiln and the preheater 11, and as a result, the chlorine concentration of the cement raw material flowing to the kiln side in the raw material input pipe 12 increases. Some of the cement raw materials with the high concentration of chlorine component
It is extracted by dropping continuously into the extraction pipe 13 in the middle of the raw material input pipe 12. At this time, it is assumed that the inside of the extraction pipe 13 is always filled with the extracted cement raw material.

The cement raw material that has fallen into the extraction pipe 13 gradually descends in this pipe in accordance with the constant discharge of the cement raw material by the rotary valve 22. The descending cement raw material is first blown with compressed air from the aeration means 14 above the extraction pipe 13. Next, after passing through the shutter damper 15 in the open state, the water reaches the central portion of the extraction pipe 13, where the water-cooled jacket 1
According to 8, the temperature below the melting point of the chlorine component (600 ° C or less)
Cooled down. As described above, since the cement raw material descending in the extraction pipe 13 is forcibly cooled by the water cooling jacket 8, it is possible to cool the extracted raw material to the predetermined temperature in a short time. In addition, the length of the extraction pipe 13 can be shortened, whereby the equipment 10 for extracting the calcined cement raw material can be reduced in size.

When the temperature measured by the upper thermometer 17 is 700 ° C. or lower, the upper vibrator 16 applies vibration to the upper part of the extraction pipe 13. If the cement raw material is clogged at the upper part of the extraction pipe 13 and does not fall, the temperature at the detection position decreases. Then, vibration is added to release the clogging. Further, when the temperature measured by the lower thermometer 19 becomes 300 ° C. or less, it is determined that the clogging of the cement raw material has occurred at a position above the lower thermometer 19, and the lower vibrator 21 determines the lower portion of the extraction pipe 13. Give vibration. This is to release clogging of cement raw materials. Further, at the pipe upstream of the lower vibrator 21, a lump of the cement raw material generated due to the generation of the chlorine compound is crushed by the agitator 20. Thereby, clogging of the cement raw material in the lower part of the extraction pipe 13 can be prevented.

The cement raw material reaching the lower end of the extraction pipe 13 is cut out by a rotary valve 22 into an ejector 23 by a fixed amount. The rotary valve 22 rotates the valve body at a predetermined speed by an electric motor. The discharge amount of the ejector 23 is usually 0.5 to 1 t /
hr. As described above, while a part of the cement raw material extracted from the raw material input pipe 12 to the extraction pipe 13 is descending the extraction pipe 13, it is cooled to a temperature equal to or lower than the melting point of the chlorine component. After that, the cooled cement raw material is cut out by a fixed amount using the rotary valve 22.
As a result, a cement raw material containing a high concentration of chlorine can be quantitatively extracted while cooling without hindering the operation of the cement kiln.

The cement raw material discharged from the extraction pipe 13 is charged into the ejector 23. The ejector 23 is supplied with compressed air from a blower device 24. The speed of the compressed air is increased in the ejector 23, and the compressed air takes in the cement raw material discharged from the extraction pipe 13 and sends it to the dust tank 25 under pressure. At this time, the average particle diameter of the cement raw material is 20 to 30 μm, and the raw material temperature is 100 ° C.
It is. As described above, the cement raw material discharged from the extraction pipe 13 is pneumatically fed to a desired place while being cooled and at a low cost of equipment and a low operating cost.

The fed cement material is collected by the bag filter 26 and dropped into the tank 25. .
The temperature of the cement raw material is managed based on temperature data from an inlet thermometer 27 near the raw material inlet and an outlet thermometer 28 near the raw material outlet. Normally, the target value of the temperature control of the cement raw material in the dust tank 25 is 1
It is below 00 ° C. This is to facilitate subsequent handling work. The high chlorine content cement raw material discharged from the dust tank 25 has a high chlorine content (0.5%).
１1% by weight). This high chlorine content cement raw material can be used, for example, as a cement solidifying material. Further, for example, the chlorine component is reduced by washing with water, and then the chlorine component can be introduced into a cement kiln as a cement material having a low chlorine concentration, or can be used as various other civil engineering and building materials.

Incidentally, as shown in FIG.
Of the cement raw material pumped into the dust tank 25 is classified by a cyclone classifier 30, and the calcined cement is divided into fine dust having a high chlorine concentration and coarse dust having a low chlorine concentration. Raw material extraction equipment 1
0 may be changed. FIG. 2 is a main part configuration diagram of a facility for extracting calcined cement raw material according to another embodiment of the present invention. Here, a cyclone having a classification point of 7 μm is used as the classifier 30. The chlorine concentration of fine dust having a particle size of 7 μm or less is about 2.5 times that of coarse dust exceeding 7 μm. Fine dust is put into the dust tank 25, and coarse dust is stored in the coarse tank 31.
For example, coarse dust can be injected into the kiln butt of a cement kiln, while fine dust can be collected by a bag filter as is. The fine dust collected by the bag filter is dust having an extremely high chlorine concentration. Therefore, the concentration of chlorine contained in the cement raw material in the dust tank 25 can be further increased.

Here, a test result of a chlorine concentration test, specifically, a lab test using an air classifier is reported. The chlorine concentration of the classified cement raw material is 4,598.
ppm. The classification points were 7 μm, 18 μm, and 32 μm. The recovery rate (%) of fine dust and coarse dust and the chlorine concentration (ppm) at each classification point are as follows. (1) In the case of 7 μm, the recovery rate of coarse dust is 85.4%,
The chlorine concentration was 3,802 ppm, the recovery rate of fine dust was 14.6%, and the chlorine concentration was 10,327 ppm. (2) In the case of 18 μm, the recovery rate of coarse dust is 62.0
%, The chlorine concentration is 2,084 ppm, the recovery rate of fine dust is 38.0%, and the chlorine concentration is 8,931 ppm. (3) In the case of 32 μm, the collection rate of coarse dust is 38.3.
%, The chlorine concentration was 1,260 ppm, the recovery rate of fine dust was 61.7%, and the chlorine concentration was 6,892 pp.
m. From these test data, it was found that fine dust having a classification point of 7 μm had the lowest chlorine recovery but the highest chlorine concentration. In addition, it was also found that if about 60% of the coarse dust was removed, the chlorine concentration was approximately doubled.

[0037]

According to the present invention, a part of the cement raw material in the raw material input pipe is extracted using the extraction pipe, and the temperature of the raw material is lowered while the raw material descends the extraction pipe.
Since a constant amount is discharged to the outside by the constant amount discharging means, the cement raw material containing a high concentration of chlorine can be quantitatively extracted while cooling without hindering the operation of the cement kiln.

Particularly, in the invention according to claim 2,
Since the cooling means for cooling the cement raw material in the pipe is provided in the extraction pipe, the extraction raw material can be cooled to a predetermined temperature in a short time. Moreover, the length of the extraction pipe can be shortened, and as a result, the equipment for extracting the calcined cement raw material can be reduced in size.

According to the third aspect of the present invention, since the agitator for crushing the lump of the cement raw material in the extraction pipe is provided in the extraction pipe, clogging of the cement raw material in the extraction pipe can be prevented.

According to the fourth aspect of the invention, since the extraction pipe is vibrated by the vibrator, clogging of the cement raw material in the extraction pipe can be prevented.

According to the fifth aspect of the invention, since the compressed air is injected into the extraction pipe by the aeration means, clogging of the cement raw material in the extraction pipe can be prevented.

According to the sixth aspect of the present invention, since the pneumatic feeding means is connected to the lower end of the extraction pipe, the cement raw material discharged from the extraction pipe is cooled by compressed air to a desired place while being cooled. can do.

According to the seventh aspect of the present invention, since a cyclone classifier for classifying the fed cement raw material is provided, the extracted raw material can be divided into a coarse raw material having a small chlorine content and a fine raw material having a large chlorine content. It can be classified into raw materials.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a facility for extracting calcined cement raw material according to an embodiment of the present invention.

FIG. 2 is a main part configuration diagram of a facility for extracting calcined cement raw material according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Extraction equipment of calcined cement raw material, 11 Preheater, 12 Raw material input pipe, 13 Extraction pipe, 14 Aeration means, 16 Upper vibrator, 18 Water cooling jacket (cooling means), 20 Agitator, 21 Lower vibrator, 22 Rotary valve (Quantitative discharge) Means), 23 ejector (pneumatic pumping means), 24 blower device (pneumatic pumping means), 30 classifier.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiro Ishizaki 1-Donan-cho, Yawatanishi-ku, Kitakyushu-city, Fukuoka Prefecture Inside the Cement Development Center of Mitsubishi Materials Corporation (72) Inventor Takeshi Yamagata 1-Donan-cho, Yawatanishi-ku, Kitakyushu-shi, Fukuoka Address 1 Kurosaki Center, Ube-Mitsubishi Cement Research Institute Co., Ltd. (72) Inventor: Horiike Cho 1-Donan-cho, Yahata-nishi-ku, Kitakyushu-shi, Fukuoka F-term in Kurosaki Plant, Mitsubishi Materials Corporation 4G012 KB00

Claims (7)

[Claims] An extraction pipe, which is communicated with a lower part of a raw material charging pipe for charging a cement raw material calcined by a preheater into a cement kiln and extends substantially vertically downward for extracting a part of the cement raw material to the outside, A calcined cement raw material withdrawal facility provided with a constant-rate discharging means provided in the withdrawal pipe and discharging a constant amount of the cement raw material filled in the withdrawal pipe. 2. A facility for extracting calcined cement raw material according to claim 1, wherein said extracting pipe is provided with cooling means for cooling the cement raw material in the extracting pipe. 3. An agitator for crushing a lump of cement raw material in the extraction pipe is provided on the extraction pipe.
Or a facility for extracting the calcined cement raw material according to claim 2. 4. The facility for extracting calcined cement raw material according to claim 1, wherein the extraction pipe is provided with a vibrator for vibrating the extraction pipe. 5. The facility for extracting calcined cement raw material according to claim 1, wherein the extraction pipe is provided with aeration means for injecting compressed air into the extraction pipe. 6. An air feeding means for feeding a cement raw material discharged from a discharge port at an end of the extraction pipe to the outside by compressed air is connected to a lower end of the extraction pipe. A facility for extracting calcined cement raw material according to any one of the above. 7. A facility for extracting calcined cement raw material according to claim 6, further comprising a cyclone classifier for classifying the cement raw material pumped by said air pumping means.