JPH0676242B2 - Fluidized bed cooler coarse particle discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cement clinker manufacturing apparatus equipped with a fluidized bed firing furnace and a fluidized bed cooler, which are provided in an upper portion in the fluidized bed and a lower portion in the fluidized bed, respectively. Provide a temperature detection end,
The present invention relates to a coarse particle discharge device for a fluidized bed cooler that detects and discharges the accumulation of particles or agglomerates (coarse particles) having a diameter larger than that of a normal product based on a difference between two temperatures.

[Conventional technology]

Conventionally, for example, when manufacturing a cement clinker,
As shown in the figure, the cement raw material is converted into cyclone C ₁ by the combustion exhaust gas of the spouted bed granulation furnace 1 and the fluidized bed firing furnace 2,
While being preheated by the suspension preheater 3 consisting of C ₂ , C ₃ , and C ₄ , the cyclone C ₄ → C ₃ → C ₂ → C ₁ is sequentially transferred, and is introduced into the spouted bed granulation furnace 1 via the double flap damper 4. And granulated. Reference numeral 5 is a flap damper, and 6 is an attracting fan.

The cement raw material that has not been granulated in the spouted bed granulation furnace 1 is
It is returned again to the spouted bed granulation furnace 1 via the cyclone C ₁ . The granulated material that has accumulated and grown in the spouted bed granulation furnace 1 is an L-shaped airtight device 7 (hereinafter,
It is discharged to the fluidized bed calcining furnace 2 by the L valve 7), and is calcined there again at 1400 to 1500 ° C. The fired cement clinker was cooled by the L valve 8 in a fluidized bed cooler 10
The product is discharged to a product, cooled, and taken out as a product through an airtight device (seal valve) 11.

On the other hand, the cooling air supplied to the fluidized bed cooler 10 by the pushing fan 12 exchanges heat with the firing clinker and is supplied to the fluidized bed firing furnace 2 as combustion air. Excess air from the fluidized bed cooler 10 is discharged to the outside of the system via a dust remover (not shown).

The combustion air guided to the fluidized bed firing furnace 2 is
And used as combustion air in the spouted bed granulation furnace 1 and discharged as combustion exhaust gas from the spouted bed granulation furnace 1 while circulating in the suspension preheater 3 in the order of cyclone C ₁ → C ₂ → C ₃ → C _4. After preheating the cement raw material, it is exhausted to the atmosphere by the induction fan 6 through a dust remover (not shown).
An exhaust gas duct 13 connects the lower part of the spouted bed granulation furnace and the upper part of the fluidized bed firing furnace.

In FIG. 8, an example in which the fluidized bed cooler 10 has a single chamber has been described, but as shown in FIG. 9, the fluidized bed cooler 10a may have multiple chambers.

[Problems to be solved by the invention]

However, in the above conventional fluidized bed cooler, among the particles supplied from the burned material supply chute, particles or lumps having a larger diameter than ordinary products (hereinafter referred to as coarse particles) are less likely to be fluidized than product particles, Settles and accumulates on the bottom of the cooler. If the amount of coarse particles deposited increases, the cooling performance may deteriorate due to deterioration of fluidization, the supply chute opening may be blocked, and in the worst case, the cooler may be blocked.

The present invention has been made in view of the above points, and temperature detection ends are provided in the upper part of the fluidized bed and the lower part of the fluidized bed, and the deposition of coarse particles is detected by the difference in temperature between two to discharge the coarse particles out of the system. Accordingly, it is an object of the present invention to provide a device capable of preventing the chute from being blocked and performing stable operation for a long period of time.

[Means for solving problems]

The coarse particle discharging device of the fluidized bed cooler of the present invention will be described with reference to the drawings. In the fluidized bed coolers 10 and 10a downstream of the fluidized bed baking furnace 2 of the cement clinker manufacturing device, the openings of the burned material supply chute 14 are opened. Temperature detecting ends 23 and 22 are provided in the upper part of the fluidized bed 21 near the lower part and in the lower part of the fluidized bed 21, respectively, and a coarse particle discharge chute 17 is provided at the bottom of the cooler near the opening of the burned material supply chute 14 to discharge the coarse particle. 2 to shoot
It is characterized in that an airtight discharge device 20 is connected which opens when the temperature difference between the two temperature detection ends exceeds a certain value.

In the present invention, the temperature detecting end, the coarse particle discharge chute and the like are provided on the inlet side in the case of a single-bed fluidized bed cooler, and are provided on the inlet side first chamber in the case of a multi-chamber fluidized bed cooler.

[Action]

In the fluidized bed coolers 10 and 10a, in the fluidized state, the temperature in the fluidized bed 21 is almost uniform, but in the deposition part, since it is cooled by the air from below without mixing with high temperature particles,
The temperature of the deposit is lower than the temperature in the fluidized bed.

Therefore, the deposition of coarse particles can be detected by measuring the temperature T ₂ in the upper part in the fluidized bed and the temperature T ₁ in the lower part in the fluidized bed near the lower part of the opening for the burned material supply chute. That is, when the coarse particles are deposited, they become lower than T ₁ and T ₂ , so that the coarse particles are discharged from the system at this point.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the shape of the components described in this embodiment, the relative arrangement, and the like, unless otherwise specified, are not intended to limit the scope of the present invention to only those, and are merely illustrative examples. Only.

Example 1 As shown in FIGS. 1 and 2, in the vicinity of the lower portion of the opening 15 of the burned material supply chute 14 of the fluidized bed cooler 10 or 10a,
An opening 18 of a coarse grain discharge chute 17 is provided on a side wall above the air dispersion plate 16, an airtight discharge device 20 is provided at a lower end of the coarse grain discharge chute 17, and a lower part of the fluidized bed 21 and an upper part of the fluidized bed 21 are provided. The temperature detection ends 22 and 23 are installed on the
The temperature T ₁ of the temperature detection end 22 at the bottom of the cooler is accumulated on the bottom of the cooler below the opening 15 of 14 and the temperature of the upper temperature detection end 23 is
If it becomes lower than T ₂ , the coarse particles are discharged to the outside of the system by the airtight discharging device 20.

FIG. 3 shows an example of the control method. Ie temperature T ₁
And to input the temperature T ₂ to the calculator 24, the T ₁ T ₁ is reduced
When the difference from T ₂ exceeds a certain value, that is, when coarse particles are accumulated on the bottom of the cooler, the control valve 25 is opened to introduce compressed air, and the air cylinder 26 is operated to open the upper seal valve 27 to open the coarse valve. The grains are extracted into the coarse grain hopper 28, and when T ₁ and T ₂ match, the upper seal valve 27 is closed. Then lower seal valve
Open 30 to discharge coarse particles out of the system. In this case, the airtight discharge device 20 includes an upper seal valve 27, a coarse grain hopper 28, and a lower seal valve 30.

Note that instead of closing the upper seal valve 27 when T ₁ = T ₂ , the upper seal valve 27 is kept open and held for a certain period of time by a timer. The seal valve 27 may be closed. Further, the coarse particle discharge chute 17 is provided with a temperature detecting end 29, and when the temperature T ₃ of the temperature detecting end 29 rises (preferably T ₃ ≈T ₁ ), the upper seal valve 27 is closed. You may comprise. Further, instead of the compressed air and the air cylinder, hydraulic oil, an oil cylinder, and other known driving means can be used.

Example 2 In this example, as shown in FIG. 4 and FIG.
A part of the air dispersion plate 16 below the opening 15 of 14 is formed in a concave portion 31, a temperature detecting end 22 is provided in the concave portion 31, and another temperature detecting end 23 is provided above the temperature detecting end 22. When the coarse particles are deposited on the concave portion 31 and the lower temperature T ₁ becomes lower than the upper temperature T ₂ , the airtight discharge device 20 discharges the coarse particles out of the system. In this case, a partition plate 33 may be provided in the air box 32 below the concave portion 31 in order to make the air distribution uniform. Other configurations and operations are similar to those of the first embodiment.

Example 3 In this example, as shown in FIG. 6 and FIG.
The lower end of the opening 18 of 17 is positioned lower than the upper surface of the air distribution plate 16, and a part of the air distribution plate near the lower part of the opening 15 of the supply chute 14 is inclined toward the opening 18 of the discharge chute 17. It is configured by. Other configurations and operations are similar to those of the first embodiment.

〔The invention's effect〕

According to the present invention, as described above, by providing an outlet for coarse particles and agglomerates near the lower portion of the supply chute opening, and discharging the particles out of the system,
It has an effect that the flow state can be maintained well and the supply chute can be prevented from being blocked, and stable operation can be performed for a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective explanatory view showing an embodiment of a coarse particle discharging device for a fluidized bed cooler of the present invention, FIG. 2 is a front explanatory view thereof, and FIG. 3 is shown in FIG. Explanatory diagram showing an example of a control system in the device,
FIG. 4 is a perspective explanatory view showing another embodiment of the device of the present invention,
FIG. 5 is a front view showing the same, FIG. 6 is a perspective view showing a further embodiment of the device of the present invention, and FIG. 7 is a front view showing the same.
8 and 9 are flow sheets showing the entire cement clinker manufacturing apparatus. C ₁ -C ₄ ...... cyclone, 1 ...... spouted bed granulating furnace, 2 ...... fluidized bed sintering furnace, 3 ...... suspension preheater, 4,5
…… Flap damper, 6 …… Attractor fan, 7,8 …… L
Valve, 10, 10a ... Fluidized bed cooler, 11 ... Airtight device, 1
2 …… Indentation fan, 13 …… Exhaust gas duct, 14 …… Firing material supply chute, 15 …… Opening, 16 …… Air distribution plate, 17…
… Coarse grain discharge chute, 18 …… Opening, 20 …… Airtight discharge device, 21 …… Fluidized bed, 22,23,29 …… Temperature detection end, 24 ……
Computer, 25 …… Control valve, 26 …… Air cylinder, 27 …… Upper seal valve, 28 …… Coarse grain hopper, 30 …… Lower seal valve,
31 …… Concave part, 32 …… Wind box, 33 …… Partition plate

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Isao Hayashi 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Ltd. Akashi factory (72) Inventor Zenji Okada 4-1-1 Shimaya, Konohana-ku, Osaka-shi, Osaka No. Kawasaki Heavy Industries, Ltd.Osaka factory

Claims (1)

[Claims] 1. In a fluidized bed cooler downstream of a fluidized bed firing furnace of a cement clinker manufacturing apparatus, temperature detection ends are provided in an upper portion inside the fluidized bed and a lower portion inside the fluidized bed near a lower portion of a firing opening for supplying a fired material. A coarse-grain discharge chute is provided near the bottom of the supply chute opening at the bottom of the cooler, and an airtight discharge device that opens when the temperature difference between the two temperature detection ends exceeds a certain value is connected to the coarse-grain discharge chute. Characteristic fluidized bed cooler coarse particle discharge device.