JP2588984Y2 - Cement clinker cooling system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a cement clinker cooling device comprising a fluidized bed cooler and a multi-chamber fluidized bed cooler.

[0002]

2. Description of the Related Art As a cooling device for a cement clinker, a cement clinker firing device comprising a spouted bed or a fluidized bed type granulating furnace and a fluidized bed firing furnace, wherein the fluidized bed firing furnace is used as a primary cooling means. An apparatus for cooling and recovering a cement clinker by connecting a fluidized bed cooler as a secondary cooling means with a multi-chamber fluidized bed cooler is known. (See, for example,
-229745)

[0003]

[Problems to be solved by the invention] In the prior art,
The fired granulated material, ie, cement clinker, which flows in from the firing furnace using the fluidized bed cooler as the primary cooler, is rapidly cooled, and is cooled down using the multi-chamber fluidized bed as the secondary cooler. Is low. In order to solve such a problem, as shown in FIG. 9, the use of a countercurrent packed bed cooler as secondary cooling means has been attempted. This packed bed cooler is a countercurrent heat exchanger, and if ideal heat exchange is performed, the heat recovery efficiency will be high.However, since the cement clinker to be cooled has a wide particle size, segregation occurs.
In addition, a uniform flow cannot be obtained. That is, since the cooling air flows more easily in the cooled area, it is not possible to prevent the drift of the cooling air, so that the heat recovery efficiency is much lower than the theoretical value. Further, when the packed bed cooler is scaled up, the segregation and the drift are further increased, so that there is a problem that the thermal efficiency is further reduced and the size of the apparatus is increased. From this,
As a secondary cooling means, improvement of a multi-chamber fluidized-bed cooler free from segregation and drift has been desired.

An object of the present invention is to push the cooling air, which is pushed into the cooler side cooler in the secondary cooling means of the cement clinker, and the heat exchanged cooling air between the cement clinker into the hotter side cooler, thereby improving the cooling efficiency and heat. It is intended to improve the collection efficiency.

[0005]

The cement clinker of 1400 to 1450 ° C discharged from the fluidized-bed firing furnace overflows and is fluidized in a fluidized-bed cooler at 1000 to 1100 ° C.
The air after cooling is introduced into the empty tower of the firing furnace,
Collected as combustion air in the granulation furnace. On the other hand, the cement clinker quenched by the fluidized bed cooler flows down the discharge chute having the airtight damper means and is introduced into the high temperature side cooler of the multi-chamber fluidized bed cooler. Cooling air is pushed into the low-temperature side cooler of this multi-chamber fluidized-bed cooler by a dedicated roots blower, and the cooling air that has cooled the cement clinker and exchanged heat is used as cooling air for the high-temperature side cooler. Is introduced into a baking furnace wind box and collected as baking furnace air.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an embodiment using a multi-chamber fluidized-bed cooler as a secondary cooling means, FIG. 2 is a cross-sectional plan view of the multi-chamber fluidized-bed cooler, FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 2B
5 is a cross-sectional view taken along the line C-C of FIG. 2, FIG. 6 is a vertical cross-sectional front view showing another example of the multi-chamber fluidized bed cooler, and FIG. Schematic diagram of the embodiment, FIG.
Is a schematic view of an embodiment in which a fluidized-bed cooler and a multi-chamber fluidized-bed cooler are connected and a tertiary cooler is connected, and FIG. 9 is a schematic view of a general fluidized-bed cement sintering facility.

Referring to FIG. 9, a general whole system of the apparatus will be described. Reference numeral 1 denotes a suspension preheater, and the suspension preheater 1 is constituted by cyclones C ₁ , C ₂ and C ₃ . Cement raw material powder introduced into the system from the raw material charging chute 2 is cyclone C ₃ → C ₂ → C
After being preheated through ₁ , it is charged into a fluidized bed type granulation furnace 3. The granulated material subjected to flow sizing in the granulation furnace 3 is fed into the fluidized bed firing furnace 6 from the discharge chute 4 via the L valve (airtight discharge device) 5. The cement clinker fired in the firing furnace 6 is discharged into the fluidized-bed cooler 7 serving as the primary cooling means by the overflow means, rapidly cooled, and then recovered as the cement clinker through the packed-bed cooler 8. As described above, the present invention uses an improved multi-chamber fluidized bed cooler in place of the packed bed cooler 8 which has been attempted to be used as the secondary cooling means.

Next, the details of the first embodiment will be described with reference to FIGS. Reference numeral 9 denotes a multi-chamber fluidized bed cooler which is a secondary cooling means. The multi-chamber fluidized bed cooler 9 is connected to the fluidized bed cooler 7 which is a primary cooling means by a chute 11 having an airtight damper mechanism 10. It is composed of a high-temperature side cooler 9a and a low-temperature side cooler 9b. The high-temperature side cooler 9a and the low-temperature side cooler 9b are separated by a partition wall 12. The fluidized bed portions of the coolers 9a and 9b and the wind boxes 13a and 13b are divided into a plurality of fluidized chambers 9c and 9d by a partition plate 14. A dedicated roots blower 16 is connected to each of the divided wind boxes 13b of the low-temperature side cooler 9b via a damper adjusting mechanism 15, and an empty tower of the low-temperature side cooler 9b and the high-temperature side cooler 9b. The divided wind box 13a of the cooler 9a is connected via a damper adjusting mechanism 17. In other words, the air after fluidizing and cooling the cement clinker with the cooling air pushed into the low-temperature side cooler section 9b is used as cooling air for the high-temperature side cooler section 9a, and the exhaust gas is used for fluidization. It is pushed into the wind box of the firing furnace 6.

As shown in FIG. 3, an overflow discharge port 18 is formed on one side of the partition wall 12, and the cement clinker is moved from the high-temperature side cooler section 9a through the overflow discharge port 18 to the low-temperature side cooler section 9b. Is supplied to the user. Further, a notch recess 19 for overflow is formed at one end of the upper side of all the partition plates 14 as shown in FIG. 4, and this notch recess 19 is formed as shown in FIG. , Provided alternately in front and rear, and adjacent flow chambers 9c
, And is configured such that a sufficient cooling time can be obtained. FIG. 6 shows the overflow outlet 1
8. Overflow pipe 20 instead of notch recess 19
Are provided on the partition wall 12 and the partition plate 14. All the overflow pipes 20 are inclined downward toward the downstream side, and the overflow level is gradually reduced from the upstream side to the downstream side, so that the low-temperature side cooler section 9b Lower the layer height.

Next, a second embodiment will be described with reference to FIG. 7. In this embodiment, the fluidized bed firing furnace 6 and the fluidized bed cooler 7 are used.
Are integrated to make the apparatus compact. However, in order to prevent back mixing between the fluidized-bed baking furnace 6 and the fluidized-bed cooler 7, it is necessary to make the bed height of the fluidized-bed cooler 7 lower than the bed height of the fluidized-bed baking furnace 6 to make a difference in bed height. is there. In addition, the bed height of the multi-chamber fluidized bed cooler 9 also decreases from the upstream side to the downstream side.

In the third embodiment shown in FIG. 8, the fluidized-bed cooler 7 is connected to or integrated with the upstream side of the multi-chamber fluidized-bed cooler 9 to reduce the size of the cement clinker cooling device. is there. However, it is necessary to provide an airtight device on a chute (not shown) for discharging and supplying the cement clinker quenched by the fluidized bed cooler 7 to the upstream side of the high temperature side cooler section 9a of the multi-chamber fluidized bed cooler 9 by overflow means. As shown in the figure, when the fluidized bed cooler 21 is connected as a tertiary cooling means to the low temperature side cooler portion 9b of the multi-chamber fluidized bed cooler 9 in order to further lower the temperature of the cement clinker, the cooling air by the dedicated roots blower 22 is used. Do not collect the exhaust of

[0012]

According to the configuration of the present invention as described above, the following effects can be obtained. (A) The cement clinker fired in the fluidized bed firing furnace is 1
It is rapidly cooled by a fluidized cooling action in a fluidized bed cooler as a secondary cooling means, and further cooled and recovered in a multi-chamber fluidized bed cooler as a secondary cooling means. (B) Particularly in the present invention, The multi-chamber fluidized-bed cooler is composed of a high-temperature side cooler and a low-temperature side cooler, and cooling air for fluidization cooling is pushed into the low-temperature side cooler, and air exchanged with the cement clinker is cooled by the high-temperature side cooler. Since the cooling air is pushed into the cooling section, cooling air having a temperature corresponding to the temperature of the cement clinker in each cooler section can be pushed, and the heat recovery efficiency and the cooling efficiency can be improved rationally.

[Brief description of the drawings]

FIG. 1 is a schematic view of an embodiment using a multi-chamber fluidized bed cooler as a secondary cooling means.

FIG. 2 is a cross-sectional plan view of a multi-chamber fluidized-bed cooler.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line B-B of FIG. 2;

FIG. 5 is a sectional view taken along the line CC of FIG. 2;

FIG. 6 is a longitudinal sectional front view showing another example of the multi-chamber fluidized bed cooler.

FIG. 7 is a schematic view of an embodiment in which a firing furnace and a fluidized-bed cooler are integrated.

FIG. 8 shows a combination of a fluidized bed cooler and a multi-chamber fluidized bed cooler,
It is the schematic of the Example which provided the next cooler continuously.

FIG. 9 is a schematic view of a general fluidized bed cement baking facility.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 suspension preheater 3 granulating furnace 4 discharge chute 5 L valve 6 firing furnace 7 fluidized bed cooler 9 multi-chamber fluidized bed cooler 9 a high temperature side cooler section 9 b low temperature side cooler section 9 c flow chamber 9 d flow chamber 10 airtight damper mechanism 11 chute 12 partition 13a wind box 13b wind box 14 partition plate 15 damper adjustment mechanism 16 dedicated roots blower 17 damper adjustment mechanism

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiyuki Ishibachi 1 Sumitomo Cement Co., Ltd., Kanda-Midshiro-cho, Chiyoda-ku, Tokyo (72) Inventor Isao Hashimoto 1-1-1, Kawasaki-cho, Akashi-shi Kawasaki Heavy Industries, Ltd. Company Akashi Plant (72) Inventor Mikio Murao 3-1-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Shozo Kanamori 3-1-1 Higashikawasakicho, Chuo-ku, Kobe-shi Kobe Factory, Kawasaki Heavy Industries, Ltd. (56) References JP-A-2-229745 (JP, A) JP-A-63-60138 (JP, A) JP-A-59-131550 (JP, A) JP-A-59- 69452 (JP, A) JP-A-57-122929 (JP, A) JP-A-63-40794 (JP, U) JP-A-57-83140 (JP, U) (58) Fields investigated (Int. ⁶ , DB name) C04B 7/47

Claims (1)

(57) [Scope of request for utility model registration] 1. A cement clinker baking apparatus comprising a spouted bed or a fluidized bed type granulation furnace and a fluidized bed baking furnace, wherein the fluidized bed baking furnace is provided with a fluidized bed cooler as a primary cooling means. In a cooling device for a cement clinker having a multi-chamber fluidized bed cooler connected as a secondary cooling means, the multi-chamber fluidized bed cooler is divided into a high-temperature side cooler section and a low-temperature side cooler section, and cooled in a wind box of the low-temperature side cooler section. A cooling device for a cement clinker, characterized in that an air pushing means is provided and an empty tower of a low-temperature side cooler is connected to a wind box of a high-temperature side cooler.