JPS61146743A - Cement clinker take out device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] A. Purpose of the Invention (Field of Industrial Application) The device of the present invention crushes clinker produced by firing raw materials during cement production, and extracts it in a form that is easy to crush in subsequent steps. available for.

(Prior art) Cement is a powder containing silica, alumina, lime, iron oxide, magnesia, etc., but to manufacture it, limestone and other raw materials are mixed and placed at one end of a rotary kiln. 2000℃ from the burner installed at the other end.
Fired by blowing in high temperature gas.

The outline of this conventionally used device is as shown in FIG. That is, raw material 2 is charged into the inclined rotary kiln 1 from the right end in the figure, and as the kiln 1 rotates, the raw material 2 is moved toward the left end. A burner 3 is inserted into the left end of the kiln 1, which injects and burns the fuel together with the primary air.The clinker is cooled and the heated air is used as secondary air to generate high-temperature gas of about 2000℃. The raw material is heated and fired by this high-temperature combustion gas. The fired raw material becomes clinker 4 with a particle size of about 10 to 20 mm/cm and a temperature of about 1350°C, and falls into the cooling chamber 5, where it is placed on a cooling conveyor 6 and transported to the outlet 5a. Then, it is cooled by air blown into the cooling chamber 5 from the fan 7, solidifies into large and small particles, and falls onto the take-out conveyor 8 from the outlet 5a and is taken out. The air that cools down the clinker that has fallen onto the cooling conveyor 6 and becomes hot.

It enters the rotary kiln l and is used as combustion secondary air as described above. The combustion gas from burning the raw material is used to preheat the raw material.

The clinker 4 solidified into granules is then crushed by a crusher such as a ball mill to become finely powdered cement.

(Problems to be Solved by the Invention) The clinker fired in this manner and cooled and solidified is taken out in the form of extremely hard particles.

After that, a crushing operation must be carried out, which requires large-scale equipment and power.

Working hours will also be longer.

Structure of the Invention (Means for Solving Problems) This invention allows clinker exiting a rotary kiln in the form of high-temperature soft particles to fall onto a rolling roll, either directly or through a cooling cylinder, and this rolling roll cools the clinker. This crushes the powder into small particles, thereby reducing the amount of subsequent grinding work.

Granular cement clinker has the property of being easily broken into small particles when subjected to strong pressure at high temperatures. This invention takes advantage of this property. Furthermore, the purpose of using a cooling cylinder is to rapidly cool the clinker from the outside, making use of the thermal stress caused by the fact that the core of the clinker remains at a high temperature, making it easier to crush the clinker. be.

Since the rolling rolls are in contact with the high-temperature clinker, they are made of heat-resistant steel and cooled with water or air passed through the rotating shaft, and the surface is also cooled by blowing air from a nozzle.

(Function) The high-temperature clinker with a particle size of 10 to 20 centimeters/cm leaves the rotary kiln and falls between rolling rolls that rotate facing each other with one gap in between, and is crushed into fine particles.

Since clinker has a property that its strength against crushing is lower when it is at high temperature than when it is at room temperature, it can be easily crushed by passing it through rolling rolls immediately after leaving the rotary kiln.

Furthermore, when a high-temperature granular clinker is rapidly cooled, one surface portion contracts, and since the inside is still hot, large thermal stress is generated on the surface due to thermal stress, making it easy to break.

Therefore, the clinker is more easily crushed than in the conventional method of crushing cooled clinker using a ball mill or the like. While the temperature of the clinker is high, crushing as described above can be performed, so a second rolling roll is provided.
If the crushing is further advanced, finer particles or thin plate-like clinker pieces can be obtained. Clinker solidified into small pieces can be crushed much more easily than in the past. Furthermore, since the clinker can be made into small pieces to increase the surface area, cooling in the cooling chamber can be performed quickly.

(Embodiment) FIG. 1 is a side view of a connecting portion between the outlet of a rotary kiln 1 and a cooling conveyor 6, showing an embodiment in which the cooling cylinder of the present invention is used.

A rotating cooling cylinder 10 and a rolling roll 9 are provided between the rotary kiln 1 and the cooling chamber 5, and the outlet of the rotary kiln 1 and the inlet of the cooling cylinder 10 are connected by a first cover 11. The outlet of the cooling cylinder 10 and the cooling chamber 5 are
They are connected by a second cover 12.

As shown in FIG. 2, the cooling cylinder 10 has an outer wall 10a and an inner wall 1.
0b, and is supported by rollers 13 and rotated in the same manner as a rotary kiln. inner wall 1
- A protrusion 14 is formed in the axial direction protruding inward on Ob,
A large number of air holes 15 are formed in this, and the inside and outside 1110a,
The compressed air sent between the fob is passed through the air hole 15 to the inner wall 1.
It is made possible to eject into the 0b. To supply compressed air between the inner and outer walls 1. For example, as shown in FIGS. 1 and 3, an air jacket (16) that surrounds a part of the outer wall (101J) and can freely slide and rotate between the outer walls (101J) is used. A fan 18 supplies air through an air pipe 17. This fan is the fan 7 mentioned above.
(Fig. 5) can also be used.

Alternatively, as shown in FIG. 4, the space between the inner and outer walls 10a and 10b is divided into several sections in the vertical direction by a partition wall 19, and the width of the air jacket 16 is narrowed so as to supply air only to the lower section.
Rapid cooling of the clinker can be made effective by blowing out compressed air only to the lower part of the cooling cylinder 10 through which the clinker flows and concentrating the air on the clinker. Note that the protrusion 14 can be omitted if only cooling is considered. 20 is a chute for flowing clinker from the rotary kiln 1 into the cooling ta10. As mentioned above, the rolling a-rule 9 provided in the second cover 12 is made of hollow heat-resistant steel and is cooled from inside by circulating water or air through the hollow shaft, and is also blown with outside air from the nozzle 21. It is also cooled from outside. The air whose temperature has increased by cooling the rolling rolls 9 enters the rotary kiln l together with the air which has cooled the clinker pieces that are placed on the cooling conveyor 5 and moves, and is passed through the burner 3.
It is used as air for secondary combustion of fuel ejected from the air.

With the above configuration, the clinker fired in the rotary kiln 1 and turned into granular particles with a grain size of 1'0 to 20 ml passes through the chute 20 and enters one end of the cooling cylinder 10.
As the inclined cooling cylinder 10 rotates, it spills from the other end and falls between the rolling rolls 9. During this time, the clinker is disturbed by the ridges 14, rapidly cooled by the compressed air blown out from the air holes 15, and broken into pieces, or a large thermal stress is generated in a portion near the surface of the clinker.

This clinker is crushed by being rolled by the rolling rolls 9 into small granular or flaky clinker pieces, falls onto the cooling conveyor 6, cools and solidifies, and is transferred to the take-out conveyor 8 in the same manner as before. taken out.

As a result of the rapid cooling and crushing by the rolling rolls, the clinker pieces become granular or flaky with a small particle size, so that the subsequent pulverization process using a ball mill or the like can be facilitated.

Although it is possible to crush high-temperature granular clinker by rolling without using the cooling cylinder 10, if a cooling cylinder is used, thermal stress is used to generate large thermal stress on the clinker surface, and rolling In addition to assisting the crushing by the rolls, the heat resistance performance of the rolling rolls can be relaxed.

C. Effects of the invention (1) Since the clinker is preliminarily made into particles or flakes with a small particle size by utilizing the property of cement clinker that is easily crushed when rolled at high temperature, the subsequent pulverization process is facilitated.

(2) Since the clinker is preliminarily pulverized, the equipment for subsequent pulverization can be simplified, the required power can be reduced, and the working time can be shortened.

(3) The resistance to crushing of high-temperature clinker is small, so the power required for crushing is small, and the rolling roll 9 can be made hollow with low strength and rolled as a water or air cooling structure.

(4) When the cooling cylinder 10 is used, thermal stress can be used to assist clinker pulverization, and the heat resistance performance of the rolling rolls can be relaxed.

(5) Since the clinker that has been preliminarily pulverized into fine particles or flakes has a fast cooling rate, air cooling in the cooling chamber 5 is effectively performed.

(8) The air that is blown onto the surface of the rolling roll to cool it is used as secondary air for the burner, so there is no energy loss.

[Brief explanation of the drawing]

1 to 4 schematically show an embodiment of the present invention, FIG. 1 is a side view showing a cooling cylinder between a rotary kiln and a cooling conveyor, and a rolling roll section, and FIG. 2 is an A-A in FIG. 1. Cross section, 3rd
The figure is a sectional view taken along line BB in FIG. 1, and FIG. 4 is a similar sectional view showing a modification of FIG. 3. FIG. 5 is a longitudinal side view schematically showing a conventional cement firing apparatus. l: rotary kiln, 2: raw material, 3: burner, 4: clinker, 5: cooling chamber, 5a: outlet, 6: cooling conveyor, 7
: Fan, 8: Take-out conveyor. 9: Rolling roll, 1o: Cooling cylinder, 10a: Outer wall. 10b: Inner wall, 11: First cover, 12: Second cover, 13: Roller, 14: Projection, 15: Air hole, 16:
Air jacket, 17: Air pipe, 18: 77 N,
19: partition, 20: shoe), 21: nozzle.

Claims (1)

[Claims] 1) A heat-resistant rolling roll (9) is provided between the rotary kiln (1) and the cooling conveyor (6) for rolling the clinker (4) that is turned into soft particles and exits from the rotary kiln (1). ) A cement clinker extraction device characterized by being provided with: 2) Between the rotary kiln (1) and the cooling conveyor (6), there is a cooling cylinder (10) that receives the clinker (4) that comes out of the rotary kiln (1) in the form of soft particles and cools it by blowing air. ) and a heat-resistant rolling roll (9) for rolling the clinker exiting the cooling cylinder (10).