JPS62230657A - Plant for manufacturing cement clinker - 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] [Industrial Application Field] The present invention relates to a cement clinker manufacturing apparatus, and more particularly, to an apparatus for manufacturing cement clinker, which is capable of efficiently manufacturing cement clinker having a uniform particle size without supplying seed clinker. The present invention relates to a cement clinker manufacturing device that can produce cement clinker.

[Conventional technology]

Conventionally, cement clinker manufacturing equipment has been manufactured using systems such as a suspension preheater combining multiple cyclones, a spouted bed granulation furnace, a fluidized bed calcining furnace, and a cooling device, as shown in Japanese Patent Publication No. 60-18718. 2. Description of the Related Art A cement clinker production apparatus is known in which a lower part of a spouted bed granulation furnace and an upper part of a fluidized bed kiln are connected by an exhaust gas duct.

In the above-mentioned conventional equipment, the preheated raw material from the suspension preheater is input into a conduit connecting the cooling device and the granulation furnace, and mixed with high-temperature cooled air extracted from the cooling device for heat exchange. It is characterized by being transported to a grain furnace. As a result, there is no problem of the molten components of the raw material accumulating and growing on the inner wall surface of the conduit connecting the cooling device and the granulation furnace, resulting in a coating, and the amount of heat recovered from the cement clinker cooling device is This has the effect of making it possible to use the information very effectively.

[Problem that the invention seeks to solve]

In the apparatus described in the above-mentioned Japanese Patent Publication No. 60-13738, the temperature inside the spouted bed granulation furnace is approximately 1250 to 1350°C.
The burner of the spouted bed granulation furnace is installed on the side wall of the straight body of the granulation furnace.
Furthermore, relatively low-temperature combustion air extracted from the cooling device containing the calcined raw material is introduced so as to cover the inner wall surface of the spouted bed granulation furnace, so that the fuel from the burner flows into the spouted bed around the bed. A local high temperature region with a large temperature difference between the two regions is not formed. Therefore, the temperature distribution within the spouted bed becomes approximately uniform. Since no local high-temperature area is formed in the spouted bed and the temperature is almost uniform, the amount of liquid phase component produced by partially melting the cement raw material powder is small. As a result, only small-sized granules are produced, and the granulation rate of cement raw material powder is slow, and particles with irregular sizes are likely to be produced. On the other hand, if the bed temperature of the spouted bed is increased in order to increase the amount of liquid phase produced, the bed temperature will rise uniformly, causing afromation (agglomeration of particles) in the spouted bed, resulting in a stable jet flow. No layers can be formed.

The present invention has been made in view of the above points, and is a cement clinker manufacturing apparatus that can efficiently, quickly and stably manufacture cement clinker with a large granulation size and uniform particle size of 70. The purpose is to provide the following.

[Means and effects for solving the problems]
The apparatus is explained with reference to FIG. 1 to FIG. In a cement clinker production apparatus in which the upper part of a fluidized bed calcination furnace 2 is connected by an exhaust gas duct 13, a plurality of burners 18 are provided at the lower part of the spouted bed granulation furnace 1 so as to face each other and have their tips facing diagonally upward. As a result, a local high temperature region 21 is created in the spouted bed.
A preheated raw material input chute 22 for inputting the preheated raw material from the suspension preheater 3 is provided slightly above the local high temperature area 21, and a granule discharge chute 23 is provided on the side of the local high temperature area 21. It is characterized by

In the apparatus configured as described above, if the throat flow rate is selected excessively, the bed temperature of the spouted bed granulation furnace 1 will rise to 1300.
~1400″C, and 140″C is in the layer directly above the throat part.
A local high temperature region 21 of 0 to 1550'C is formed. Preheated cement raw material powder is put into this local = ta region 21, and the cement raw material is granulated (self-granulated) without supplying seed clinker. In this case, tM1 degree is delicious, so
The granulation speed is fast, and granules with large and uniform particle sizes (particle size of about 2 to 3 u) are formed.

As shown in FIGS. 2 to 4, another example of the apparatus includes a suspension preheater 3, a spouted bed granulation furnace 1, a fluidized bed calcination furnace 2, and a cooling device 1O. The lower part of l and the upper part of fluidized bed firing furnace 2 are exhaust gas duct 1.
In the cement clinker manufacturing equipment connected by 3,
A plurality of burners 18 are provided in the lower part of the spouted bed granulation furnace l so that the burners 18 face each other and their tips point obliquely upward to form a local high temperature region 21 within the spouted bed. A preheated raw material input chute 22 for inputting the preheated raw material from the suspension preheater 3 is provided at the top, a granule discharge chute 23 is provided at the side of the local high temperature area 21, and a fluidized bed 24 of the fluidized bed firing furnace 2 is installed at the bottom. A small fluidized bed 27 and a large fluidized bed 7128 are partitioned by a partition plate 26 having a passage port 25, and the wind box 30 is separated from the partition plate 3 at the same partition position.
1, so as to increase the fluidization speed of the small fluidized bed 27, and a device (with t .

In this device, in addition to the functions shown in FIGS. 1 to 3, the fluidization speed in the small fluidized bed 27 is increased, small particles are transferred to the large fluidized bed 28, and only large agglomerates are sorted out. By extracting small particles with uniform particle size from the large flow WII 28, it is possible to reliably and smoothly supply the small particles with uniform particle size to the cooling device 10.

〔Example〕

EXAMPLE 1 Hereinafter, embodiments of the present invention will be explained based on the drawings. In FIGS. 1 to 3, cement raw materials are used in a spouted bed granulation furnace 1 and a flow 11! While being preheated by the combustion exhaust gas from the I firing furnace 2 in the suspension preheater 3 consisting of cyclones C, C2, C3, and C4, the cyclones C4→C
3→C2→C1, and the double flap damper 4
After that, it is put into a spouted bed granulation furnace 1 and granulated. 5 is a flap damper, and 6 is an induced fan.

Cement raw materials that were not granulated in the spouted bed granulation furnace were
It is returned to the spouted bed granulation furnace 1 via the cyclone C7. The granules that have accumulated and grown in the spouted bed granulation furnace 1 are stored in an L-shaped airtight device using material sheet / 1 / gold for the granules. (
The fired cement clinker is discharged into the fluidized bed kiln 2 by the L pulp 7), where it is fired again at 1400 to 1500"C.The fired cement clinker is
The liquid is discharged to a cooling device 10 such as a fluidized bed cooler to be cooled, and taken out as a product through an airtight device (seal valve) 11.

On the other hand, the cooling air supplied to the cooling device 10 by the forced fan 12 exchanges heat with the firing tarinka, and is supplied to the fluidized bed firing furnace 2 as combustion air.

The air from the cooling device 10 is discharged to the outside of the yarn through a dust remover (not shown).

The combustion air guided to the fluidized bed firing furnace 2
and is used as combustion air in the spouted bed granulation furnace 1, and is discharged from the spouted bed granulation furnace 1 as combustion exhaust gas. Cyclone C1 → C2 → C3 → in suspension preheater 3
After preheating the cement raw material while sequentially circulating it with C1,
The air is exhausted to the atmosphere by an induction fan 6 via a dust remover (not shown). 13 is an exhaust gas duct that connects the lower part of the spouted bed granulation furnace and the upper part of the fluidized bed calcination furnace.

As shown in FIGS. 2 and 3, the spouted bed granulation furnace 1 consists of a straight body part 14 and a cone part 15, and has an exhaust gas outlet rod 16 in the upper part and a throat part 17 in the lower part.

Also, near the connection between the cone part 15 and the throat part 17 in the lower part of the furnace, a plurality of burners 18 (two burners are shown as an example) are arranged facing each other so that their base ends face diagonally upward. In the spouted bed 20, a local high temperature region 21 is formed above the tip of the burner 18, which is 100 to 150° C. higher than the temperature of the surrounding layer of the spouted bed.

The preheated raw material input chute 22 has a cone portion 15 and a straight body portion 1.
The granulated material discharge chute 23 is provided slightly above the connecting portion between the cone portion 15 and the straight body portion 14, and the granulated material discharge chute 23 is provided slightly below the connecting portion between the cone portion 15 and the straight body portion 14.

In the spouted bed granulation furnace I configured as described above, if the throat flow velocity is appropriately selected, the bed temperature of the spouted bed 20 will be 1.
The temperature of the local high temperature region 21 is 1400 to 1550'C. When powdered preheated cement raw material is introduced into this local high temperature region 21, the powdered raw material rapidly melts and self-granulates while remaining suspended in the spouted bed 20. Therefore, there is no need to separately supply seed clinker into the spouted bed 20.

Granules of cement raw material powder are discharged from the granule discharge chute 23 and supplied to the fluidized bed kiln 2.

Example 2 In this example, as shown in FIG.
4 is partitioned into a small fluidized bed 27 and a large fluidized bed 28 by a partition plate 26 having a passage port 25 at the bottom, and at the same partitioning position, a wind box 30 is partitioned by a partition plate 31 to control the fluidization speed of the small fluidized bed 27. The small fluidized bed 27 is provided with a large particle extraction port 32, and the large fluidized bed 28 is provided with a small particle extraction port 33.

The passage opening 25 of the partition plate 26 may be porous or null-shaped, or the partition plate may be fixed with a space provided below.

In the fluidized bed firing furnace 2 configured as described above, the gas flow rate in the small fluidized bed 27 is increased to leave only large agglomerates, and small particles are transferred from the small fluidized bed 27 to the large fluidized bed 28 to remove small particles. Granules with uniform particle size are supplied from the outlet 83 to the cooling device 10 and cooled. On the other hand, the large lump is discharged from the thread through the large lump extraction port 32. This example has the advantage that clinker of uniform particle size can be smoothly discharged from the fluidized NIjJ kiln 2 to the cooling device IO. Other structures and operations are the same as those shown in FIGS. 1 to 3.

〔Effect of the invention〕

As explained above, according to the apparatus of the present invention, a local high temperature region is formed in the layer of the spouted bed granulation furnace, so that the particle size of the cement clinker product is as large as about 2 to 3 fl, and the particle size is also small. Cement clinker can be produced efficiently and stably, requires less power for final crushing, and because the particle size of the cement clinker is uniform in the cooling system,
The heat recovery efficiency of the cooling system is greatly improved, and the fuel consumption of the plant is reduced. Also the fourth
In addition to the effects of the invention shown in FIG. 1, the device of 1.81 has a flow rate of 4! J@ has the effect that clinker with uniform particle size can be smoothly discharged from the forming furnace to the cooling device.

In addition, there is no trouble such as sedimentation and accumulation of large lumps in the fluidized bed kiln, and long-term stable operation is possible.

[Brief explanation of drawings]

Fig. 1 is a flow sheet showing an example of the cement clinker manufacturing apparatus of the present invention, Fig. 2 is a cross-sectional explanatory diagram showing an example of the spouted bed granulation furnace in Fig. 1, and Fig. 3 is an A in Fig. 2.
4 is a flow sheet showing another example of the apparatus of the present invention. C8-C4... cyclone, 1... spouted bed granulation furnace,
2... Flow SMA forming furnace, a... Suspension preheater, 4... Double flap damper, 5... Flap damper, 6... Induction fan, 7.8... L pulp,
10...Cooling device, 11...Airtight device, 12...
- Push-in fan, 13... Exhaust gas duct, 14...
Straight body part, 15... Cone part, 16... Exhaust gas outlet duct, 17... Throat part, 18... Burner, 20
... Spouted bed, 21... Local high temperature area, 22... Preheated raw material input chute, 28... Granule discharge chute, 2
4... Fluidized bed, 25... Passing port, 26... Partition plate, 27... Small fluidized bed, 28... Large fluidized bed, 30...
...Wind box, 81...Partition υ plate, 32...Large lump extraction port, 33...Small particle extraction port Applicant Kawasaki Heavy Industries, Ltd. Figure Z 1

Claims (1)

[Claims] 1. In a cement clinker production equipment consisting of a suspension preheater, a spouted bed granulation furnace, a fluidized bed calcination furnace, and a cooling device, and in which the lower part of the spouted bed granulation furnace and the upper part of the fluidized bed calcination furnace are connected, the spouted bed granulation A plurality of burners are installed at the bottom of the furnace so that they face each other and their tips point diagonally upward to form a localized high-temperature area within the spouted bed, and the preheated raw material from the suspension preheater is placed slightly above this localized high-temperature area. 1. A cement clinker manufacturing apparatus, characterized in that a preheated raw material input chute is provided, and a granule discharge chute is provided on the side of a local high temperature area.