JPH0718648B2 - Method for recovering seal breakage of powder seal valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a granular material seal valve for discharging high-temperature granular material while sealing from a fluidized bed furnace or a spouted bed furnace,
The present invention relates to a method for promptly and reliably recovering the seal breakage of a powdery granular material seal valve when the seal breakage occurs.

[Conventional technology]

Conventionally, an apparatus having a fluidized bed furnace or a spouted bed furnace, for example, as shown in FIG. 4, a cement raw material powder is granulated / sintered in a spouted bed granulation furnace 1 and a fluidized bed calcining furnace 2 which are configured in two upper and lower stages. In this apparatus, a granular material sealing valve 5 (hereinafter referred to as L valve 5), which is an L-shaped airtight device including a vertical portion 3 and a horizontal portion 4, is used to seal between the furnaces. .

[Problems to be solved by the invention]

When the seal of the L valve 5 is broken, that is, particles in the chute 6 on the upstream side of the L valve 5 disappear, and as shown in FIG. When the powder or granular material was blown up to the No. 1 through the L valve 5, there was no method for forming the material seal again and charging the powder or granular material into the fluidized bed firing furnace 2 below, and the operation had to be stopped.

The present invention has been made in view of the above points, and even if the L valve seal is broken, the seal break can be automatically restored instantaneously and stable operation can be continued. The purpose is to provide a recovery method.

[Means and Actions for Solving Problems]

The method of the first invention of the present application will be described with reference to FIG. 1 to FIG. 3. The high temperature powder particles are discharged from the fluidized bed furnace 2 or the spouted bed furnace 1 through the chute while sealing. Vertical part 3
In the L-shaped granular material sealing valve 5 including the horizontal portion 4 and the horizontal portion 4, a plug damper 18 is provided on the outlet side of the horizontal portion 4 of the granular material sealing valve 5, and an upstream device of the granular material sealing valve 5 and When the pressure loss of the downstream side device is detected and the pressure loss of the upstream side device increases and the pressure loss of the downstream side device decreases, the plug damper 18 is closed and the granular material seal valve 5 is closed.
It is characterized in that the plug damper 18 is closed after the temperature of the chute 6 between the bed and the fluidized bed furnace or the spouted bed furnace is detected.

Further, the method of the second invention of the present application will be described with reference to FIGS. 1 to 3, in which high temperature powder particles are discharged from the fluidized bed furnace 2 or the spouted bed furnace 1 via a chute while sealing. In the L-shaped granular material sealing valve 5 including the vertical portion 3 and the horizontal portion 4, the plug damper 18 is provided on the outlet side of the horizontal portion 4 of the granular material sealing valve 5, and the granular material sealing valve 5 is provided. When the pressure loss of the upstream side device and the downstream side device is detected and the pressure loss of the upstream side device increases and the pressure loss of the downstream side device decreases, after closing the plug damper 18, the fluidized bed furnace 2
Alternatively, it is characterized in that an air pulse is hit near the discharge port of the spouted bed furnace 1 and then the plug damper 18 is opened.

In the second aspect of the invention, after the air pulse is hit and then the temperature of the chute 6 between the granular material seal valve 5 and the fluidized bed furnace or the spouted bed furnace is detected, the plug damper 18
If it is opened, the seal break can be restored more reliably.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

Example 1 This example is a case where the present invention is applied to a cement clinker manufacturing apparatus as an example, FIG. 3 shows the entire cement clinker manufacturing apparatus, and FIG. 1 shows details of an applied portion of the present invention.
FIG. 2 shows details around the L valve. In FIG. 3, the cement raw material is cyclone C ₁ , C ₂ , C ₃ , C ₄ 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 7 consisting of, the cyclone C ₄ → C ₃ → C ₂ → C ₁ is sequentially transferred, and is introduced into the spouted bed granulation furnace 1 through the double flap damper 8 and granulated. 10 is a flap damper and 11 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 discharged to the fluidized bed firing furnace 2 by the L valve 5, and there again 14
It is baked at 00-1500 ° C. The fired cement clinker is discharged by an L valve 12 to a cooling unit 13 such as a fluidized bed cooler and cooled, and taken out as a product via a seal valve 14.

On the other hand, the cooling air supplied to the cooling device 13 by the pushing fan 15 exchanges heat with the firing clinker, and the fluidized bed firing furnace 2
As combustion air. Excess air from the cooling device 13 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 is used as combustion air in the spouted bed granulation furnace 1, is discharged as combustion exhaust gas from the spouted bed granulation 1, and is sequentially distributed in the suspension preheater 7 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 11 through the dust remover (not shown). Reference numeral 16 is an exhaust gas duct that connects the lower part of the spouted bed granulation furnace and the upper part of the fluidized bed firing furnace.

In the apparatus configured as described above, as shown in FIG. 2, the inside of the chute 6 upstream of the L valve 5 is filled with high temperature particles from the spouted bed granulation furnace 1, and the L valve 5
It forms the angle of repose inside and accumulates. An air nozzle 17 is provided at the end of the horizontal portion 4 of the L valve 5,
The angle of repose is destroyed by the air pulse from 17, and the portion is discharged to the fluidized bed firing furnace 2 by that amount. After the air pulse is stopped, the angle of repose is again formed in the L valve 5 to deposit particles. L
The discharge amount of the valve 5 is determined by the number of air pulses,
Therefore, the discharge amount is controlled by the number of air pulses.

However, when the supply amount from the spouted bed granulation furnace 1 is smaller than the discharge amount of the L valve 5, all the particles in the chute 6 on the upstream side of the L valve are discharged, and the L valve 5 is broken. , And back flow into the spouted bed granulation furnace 1 through the combustion gas of the fluidized bed baking furnace 2 and the particle L valve 5 in the fluidized bed baking furnace 2 (see FIG. 5).

In order to prevent this phenomenon, as shown in FIGS. 1 and 2, a plug damper is provided on the outlet side of the horizontal portion 4 of the L valve 5.
18 is provided, and this plug damper 18 is connected to the piston rod of the air cylinder 20 so that it can be opened and closed on the outlet side of the horizontal portion 4. 21 is a valve seat.

In the apparatus shown in FIGS. 1 and 2, when the L valve 5 is out of seal, the bed pressure difference ΔPsbk of the upstream spouted bed granulation furnace 1 rapidly increases, and at the same time, the downstream fluidized bed firing furnace. The layer differential pressure ΔPfbk of 2 sharply decreases.

When this phenomenon is detected, the air pulse of the L valve 5 is stopped, the plug damper 18 is lowered, and the L valve 5 is closed.
The reverse flow of gas in the L valve 5 is stopped, high temperature particles are supplied from the spouted bed granulation furnace 1 into the chute 6, and the temperature in the chute 6 rises rapidly. 18 is automatically opened and the discharge of the L valve 5 is started. 23 is a controller.

Example 2 In this example, as shown in FIG. 1, the blockage of the chute 6 on the upper side of the L valve 5 (which is one of the causes of the material seal breakage) , By the pulse of compressed air, it is automatically wiped off, the material seal in the L valve 5 is restored,
The feature is that the plug damper 18 can be returned to the original state as needed so that the operation can be continued. 24 is a timer and 25 is a compressed air supply pipe. Other configurations and operations are similar to those of the first embodiment.

In Examples 1 and 2, the L valve 5 on the lower side of the spouted bed granulation furnace 1
However, the present invention is not limited to this, and the present invention can be applied to the L valve 12 on the lower side of the fluidized bed firing furnace 2 and other valves that require sealing of powder and granules.

〔The invention's effect〕

As described above, according to the method of the present invention, even if a seal breakage problem of the L valve occurs, it is possible to automatically restore the seal breakage instantly. Therefore, there is little disturbance in the operation, and stable operation can be achieved. The effect of being able to continue is exhibited.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is an explanatory sectional view showing a granular material sealing valve in FIG. 1, and FIG. 3 is a method for producing a cement clinker according to the present invention. FIG. 4 is a flow chart when applied to a device, FIG. 4 is an explanatory view around a conventional granular material seal valve, and FIG. 5 is an explanatory view showing a case where the granular material seal valve is in a state where the seal is broken. . 1 ... Jet bed granulation furnace, 2 ... Fluidized bed firing furnace, 3 ... Vertical part, 4 ... Horizontal part, 5 ... Granule sealing valve (L valve), 6 ... Chute, 7 ... Suspension preheater, 8 …… Double flap damper, 10 …… Flap damper, 11 …… Induction fan, 12 …… L valve, 13 …… Cooling device, 14 …… Seal valve, 15 …… Pushing fan, 16 ……
Exhaust gas duct, 17 ... Air nozzle, 18 ... Plug damper, 20 ... Air cylinder, 21 ... Valve seat, 22 ... Thermometer,
23 ...... controller, 24 ...... timer, 25 ...... compressed air supply pipe, C ₁ -C ₄ ...... cyclone

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Chisunori Kumagai 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo Prefecture Kawasaki Heavy Industries Ltd. Kobe factory (72) Inventor Isao Hayashi 1-Kawasaki-cho, Akashi-shi, Hyogo Prefecture No. 1 Kawasaki Heavy Industries Ltd. Technical Research Institute (72) Inventor Tatsuya Watanabe 1-1 Kawasaki-cho, Akashi City, Hyogo Prefecture Kawasaki Heavy Industries Ltd. Technical Research Institute

Claims (3)

[Claims] 1. An L-shaped granular material sealing valve comprising a vertical portion and a horizontal portion, which discharges high-temperature granular material while sealing it from a fluidized bed furnace or a spouted bed furnace through a chute,
A plug damper is installed on the outlet side of the horizontal part of the granular material sealing valve to detect the pressure loss of the upstream side device and the downstream side device of the granular material seal valve, the pressure loss of the upstream side device increases, and the downstream side device When the pressure loss decreases, the plug damper is closed, and after detecting that the temperature of the chute between the granular material seal valve and the fluidized bed furnace or the spouted bed furnace rises, the plug damper is opened. A method for recovering a seal break of a powder and granular seal valve, which is characterized in that 2. An L-shaped granular material sealing valve comprising a vertical portion and a horizontal portion, which discharges high-temperature granular material while sealing it from a fluidized bed furnace or a spouted bed furnace through a chute. A plug damper is provided on the outlet side of the horizontal part of the body seal valve, the pressure loss of the upstream side device and the downstream side device of the particulate seal valve is detected, and the pressure loss of the upstream side device increases,
When the pressure loss of the downstream device decreases, after closing the plug damper, an air pulse is blown near the discharge port of the fluidized bed furnace or spouted bed furnace, and then the plug damper is opened. How to recover the seal break of the body seal valve. 3. A plug damper is opened after hitting an air pulse and then detecting that the temperature of the chute between the powder and granular material seal valve and the fluidized bed furnace or the spouted bed furnace rises. The method for recovering from the seal breakage of the granular material seal valve according to the item 2.