JP3370972B2 - Airtight discharge device in fluidized bed cement clinker firing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtight discharging device for a granulated material or a granulated calcined material from a fluidized bed furnace in a fluidized bed cement clinker calcining apparatus.

[0002]

2. Description of the Related Art In a cement clinker calcination apparatus that uses one fluidized bed granulation / firing furnace, a cement raw material is granulated and fired in the fluidized bed furnace, and the granulated and fired material from the fluidized bed furnace is airtightly discharged. And transfer to a cooler. Further, in a cement clinker firing apparatus that uses two furnaces, a fluidized bed granulation furnace and a fluidized bed firing furnace, the cement raw material is granulated in the fluidized bed furnace, and the granulated material from the fluidized bed furnace is discharged in an airtight manner. Transfer to a baking furnace. Examples of the airtight discharging device in the fluidized bed cement clinker calcination device of the one furnace type or the two furnace type as described above include
Conventionally, an airtight discharge device having an L-shaped conduit as shown in FIG. 6 is known. That is, the airtight discharge device 10
Is a supply chute 12, a horizontal portion 14, and a discharge chute 16
The granules classified and discharged from the fluidized bed furnace are inside the supply chute 12, that is, the material seal (airtight seal portion) 1 by the granules on the upstream side of the airtight discharge device.
It is thrown in 8. Material seal (airtight seal part) 1
No. 8 has a sufficient height in consideration of sealing property, and the granules are deposited at the angle of repose α in the horizontal portion 14. The granulated material accumulated on the horizontal portion 14 is blown off to the discharge chute 16 by the compressed air blown from the discharge means 20.
A passage closing means 22 such as a plug damper is installed on the discharge chute 16 side. Reference numeral 24 is a pressure gauge or a pressure switch, and the pressure loss due to the material seal is measured.

Further, as a conventional airtight discharging device, for example, in Japanese Utility Model Laid-Open No. 62-144541, the airtight discharging device is composed of a vertical passage, a horizontal passage and a discharge passage, and the powder is formed in the lower part of the reservoir for powder particles. An airtight discharging device is provided, which is provided with a discharging means for discharging the granules by compressed air, is provided with a passage closing means for closing the passage in the apparatus so as to be able to move forward and backward, and is capable of filling the storage portion with the powdery particles. Has been done. Further, in Japanese Patent Publication No. 58-32136, a vertically extending supply pipe and a discharge pipe are arranged so as to be offset from each other in a horizontal plane, and a fluidizing means is provided in a storage portion of the granular material formed between them so as to fluidize. An inlet for adjusting gas is provided in the middle of the supply pipe above the gas outlet of the means, and a material seal made of powder particles is formed between the inlet and the fluidizing means to flow to the fluidizing means. An airtight discharge device for powder particles is described in which the atomized gas and the adjusting gas to the gas inlet are introduced from a single gas source. Further, in Japanese Utility Model Laid-Open No. 6-47234,
There is described a powdery or granular material supply device in which a vibrating feeder is provided below the powdery or granular material storage chamber and a gate is provided between the storage chamber and the transfer trough. In this device, the vibrating feeder vibrates the storage chamber and the transfer trough to move the powder and granules from the storage chamber to the transfer trough side for discharge, and adjusts the opening of the gate to adjust the discharge amount of the powder and granules. is doing.

[0004]

In the conventional airtight discharging device as shown in FIG. 6, the particles are discharged by blowing the particles by the compressed air jetted from the discharging means at a constant interval. In this case, it is necessary to adjust the discharge amount to match the input amount, but the particle discharge amount was adjusted by changing the amount of compressed air and the blowing interval. However, the scale-up of cement clinker firing equipment (increase in processing capacity)
In the case where the conventional airtight discharge device is used to cope with the increase in discharge capacity due to the above, the center distance (A) between the supply chute and the discharge chute is increased, and the height of the horizontal part is increased to accumulate the horizontal part. It is necessary to increase the amount, and the airtight discharge device must be enlarged more than necessary. In addition, center distance (A)
Is the distance between the center line of the supply chute in the longitudinal direction and the center line of the discharge chute in the longitudinal direction.
In addition, when the scale is increased, the amount of compressed air used increases, and the performance of the cement clinker firing device (power consumption rate, fuel consumption) deteriorates. In addition, since the particles are blown away at a constant interval by compressed air as the discharging means, a discontinuous flow of particles results and the stability of the entire cement clinker firing device system is lacking.

Similar to the device shown in FIG.
In the conventional airtight discharge device described in Japanese Patent No. 44541, the particles are discharged by blowing the particles by the compressed air jetted from the discharging means at a constant interval, and discharged by changing the amount of the compressed air and the blowing interval. Adjust the amount. However, if a conventional airtight discharge device is used to cope with the increase in discharge capacity that accompanies an increase in the size of the cement clinker firing device (scale-up), (1) the airtight discharge device itself becomes larger than necessary. Become. (2) The amount of compressed air used increases and the performance (electric power consumption, fuel consumption) of the cement clinker firing device deteriorates. (3) It is a discontinuous discharge and lacks stability as a whole system for a cement clinker firing device. Such problems occur.

Further, the airtight discharging device described in Japanese Patent Publication No. 58-32136 has a structure (L type) in which the cores of the supply chute and the discharge chute are displaced from each other, and the powder particles to be discharged have an angle of repose. Then, the particles are deposited on the horizontal portion, and fluidized air is introduced into the portion to discharge the particles. Since this device also uses air as the discharge means like the above device, the amount of air used increases especially when scaling up, and the performance (electric power consumption, fuel consumption) of the cement clinker firing device deteriorates. Invite. In addition, there is also a problem that the airtight discharging device becomes larger than necessary when scaling up. Further, the powdery- or granular-material feeder described in Japanese Utility Model Laid-Open No. 6-47234 has a configuration in which the discharge amount of the powdery or granular material is adjusted by a vibrating feeder and a gate, but it has an operating part such as a vibrating feeder. Since it requires a lot of maintenance and requires power, it causes deterioration of the device performance (electric power consumption, fuel consumption) when applied to a cement clinker firing device. Moreover, the range of emission control by the gate is small.

In the scale-up of the fluidized bed cement clinker calcination device, a compact and airtight discharge device capable of continuous control that is stable in operation without deteriorating the performance of the entire fluidized bed cement clinker calcination device is required. Therefore, improvement of the airtight discharge device is required. The present invention has been made as a result of various test studies in view of the above points, and an object of the present invention is to provide a supply chute and a discharge chute of an airtight discharge device in a fluidized bed cement clinker burning device of a single furnace system or a two furnace system. The distance between the cores of the granules is made shorter than the distance of the bottom where the granules accumulate at the angle of repose α so that the granules are discharged by gravity drop, and a discharge gate is installed on the discharge chute side to open the gate section. By making it possible to adjust the discharge amount of the granulated material by the area (gate opening), even if the processing capacity (discharge amount) increases due to scale-up, the performance of the cement clinker firing device (power consumption rate, fuel consumption rate) ), The airtight discharger itself can be compactly and continuously adjusted in discharge capacity, and the gas in the fluidized bed cement clinker calcination device that enables stable and continuous operation can be achieved. And to provide a discharge device.

[0008]

In order to achieve the above object, an airtight discharge device in a fluidized bed cement clinker calcination device of the present invention is an airtight discharge from a fluidized bed furnace which granulates or granulates / calculates a cement raw material. In the airtight discharging device of the granulated product, the airtight discharging device is composed of a vertical supply chute and a discharge chute and a horizontal part connecting both chute, and the supply chute and the discharge chute are long sides of the bottom of the horizontal part. Is placed with a center-to-center distance such that the granules are shorter than the distance required for the granules to accumulate at the angle of repose α, so that the discharge amount of the granules that falls from the horizontal part to the discharge chute by gravity can be adjusted. , A discharge gate with a variable opening area is installed on the discharge chute side, and further between the discharge gate and the supply chute
Amount of granulated material discharged in the upper part of the horizontal part (upstream side of granulated material flow)
The auxiliary gate having a variable opening area for fine adjustment is installed (see FIGS . 1 and 2 ).

In the above apparatus of the present invention, it is preferable that the discharge gate is provided with a notch for facilitating the adjustment of the discharge amount of the granulated material depending on the opening degree (see FIGS. 3, 4 and 5) . Further, in these devices of the present invention, auxiliary discharge means for blowing gas (for example, compressed air) into the horizontal portion from the end surface on the supply chute side of the horizontal portion is provided, and the large mass accumulated on the horizontal portion is discharged to the discharge chute side. It is preferable to blow it off so that the clogging due to the large mass can be removed (see FIGS. 1 and 2). Further, in these devices of the present invention, the granules are continuously fed so that the height and / or the pressure loss of the material seal (airtight seal portion) due to the granules formed in the supply chute become constant. It is preferable to discharge and control (see FIGS. 1 and 2).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be appropriately modified and implemented. . The airtight discharge device of the present invention is a cement clinker calcination device that uses one furnace of a fluidized bed granulation / firing furnace, and a cement raw material is granulated and fired in the fluidized bed furnace, and granulated and fired from the fluidized bed furnace. In the cement clinker calcination device that uses two furnaces, one is a fluidized bed granulation furnace and the other is a fluidized bed calcination furnace, when the material is airtightly discharged and transferred to a cooler, the cement raw material is granulated in the fluidized bed furnace to form a fluidized bed. It can be applied both when air-tightly discharging the granulated product from the furnace and transferring it to the firing furnace. 1 and 2 show a schematic configuration of an airtight discharge device in a fluidized bed cement clinker burning device according to a first embodiment of the present invention. In the airtight discharge device, for example, an L-valve is used to configure the pipe line in an L shape,
An auxiliary gate is installed on the horizontal part of the L-valve, and a discharge gate is installed on the discharge chute side. FIG. 1 shows a state in which the discharge gate is closed (fully closed state). As shown in FIG. 1, the airtight discharge device 26 includes a supply chute 28, a horizontal portion 30, and a discharge chute 32. The granules discharged or classified and discharged from the inside are fed into the supply chute 28, that is, to the material seal (airtight seal portion) 34 on the upstream side of the airtight discharge device (L-valve).
The material seal (airtight seal portion) 34 has a sufficient height in consideration of the sealing property.

On the downstream side of the material seal (airtight seal portion) 34 by the granulated material, the granulated material is deposited on the horizontal portion 30. In this case, unlike the conventional airtight discharging device (center-to-center distance (A), see FIG. 6), the discharged granules are not accumulated at the angle of repose α and discharged discontinuously,
The center distance (B) between the supply chute 28 and the discharge chute 32 of the airtight discharge device (L-valve) is set shorter than the distance at the bottom where the granules accumulate at the angle of repose α so that the granules fall by gravity. Allow it to be discharged. The center-to-center distance (B) is the distance between the center line of the supply chute 28 in the longitudinal direction and the center line of the discharge chute 32 in the longitudinal direction. By shortening the inter-core distance ((B) <(A)) between the supply chute and the discharge chute, the granulated material is discharged by gravity falling, and compressed air is not used as a discharging means. Performance (power consumption, fuel efficiency) is improved. In this case, a discharge gate 36 is installed on the discharge chute 32 side so that the discharge amount of the granulated product can be adjusted by the opening area (gate opening) of the gate portion. Further, an auxiliary gate 38 is provided in front of the discharge gate 36 of the horizontal portion 30 (upstream side of the granulated material flow).
Is provided to enable fine adjustment of the discharge amount. Discharge gate 36
As shown in FIG. 3, the gate member 40 is provided with a notch 42 in the lower part in consideration of controllability, so that the discharge amount can be easily adjusted by the area (opening) of the opening 44. Note that FIG.
Then, as an example, the notch 42 has an inverted V notch shape, but any shape such as an inverted U shape or a semi-elliptical shape can be used as long as the discharge amount can be easily adjusted by the opening degree. For example, the notch 42a may be formed by expanding the lower portion as shown in FIG.

For example, when the discharge gate 36 of FIG. 1 is closed (fully closed state), as shown in FIGS. 1 and 3, the opening 44 of the discharge gate 36 is located below the bottom surface of the horizontal portion 30. Yes, granules are not discharged. On the other hand, FIG.
Shows a state (open state) in which the discharge gate 36 is opened at a predetermined opening degree, and when the discharge gate 36 is open, as shown in FIGS. 2 and 4, the opening portion 44 of the discharge gate 36 is shown.
From the above, the granulated material is discharged by gravity falling according to the opening area above the bottom surface of the horizontal portion 30. The area (opening) of the opening 44 of the discharge gate 36 is adjusted by, for example, connecting the discharge gate 36 to a cylinder shaft such as a hydraulic cylinder (not shown) via a shaft 46, and using the hydraulic cylinder or the like. It can be performed by moving the position of. The opening degree of the auxiliary gate 38 for finely adjusting the discharge amount can be similarly adjusted. 48 is an axis. In this way, the auxiliary gate 38 and the discharge chute 32 are attached to the horizontal portion 30.
The discharge gate 36 is installed on the side, and the discharge amount of the granulated product is adjusted by the opening area (gate opening) of the gate portion.
The discharge amount is easily adjusted by combining the discharge gate 36 with the notch 42 in consideration of controllability. Further, since the continuous control is performed by the opening area (gate opening) of the gate portion such as the discharge gate 36, a continuous flow of particles is obtained, and the stability of the entire system of the cement clinker firing apparatus is improved.

Further, as described above, the airtight discharge device (L
A material seal (airtight seal portion) 34 made of a granulated material is provided at a sufficient height on the upstream side of the (valve) in consideration of the sealing property. The height (pressure loss) of the granulation product can be controlled by continuously discharging the granulated product according to the opening area (gate opening) of the discharge gate 36 and the like. For example, as shown in FIG. 1, the pressure loss due to the material seal is measured and controlled by the pressure gauge or the pressure switch 50. In FIG. 2, the pressure gauge or the pressure switch is not shown. That is, the granulated material can be continuously discharged and controlled so that the height (pressure loss) of the material seal (airtight seal portion) 34 due to the granulated material becomes constant, whereby the cement clinker is fired. The stability of the entire system increases. If the airtightness due to the material (granulated material) is cut off, the exhaust gate 36 (or / and the auxiliary gate 38) is fully closed to facilitate the restoration. In addition, the center distance between the supply chute and the discharge chute is short, and moreover,
Since the required discharge amount of the granulated product can be grasped by the gate opening (opening area), the airtight discharging device can be made compact even when scaling up (when the processing capacity is increased). That is, it is possible to scale up without increasing the size of the airtight discharge device more than necessary. In addition, the large mass generated in the fluidized bed furnace is the auxiliary gate 38 and / or the discharge gate 3
When it is clogged in 6 or the like, compressed air can be blown out from a nozzle or the like installed as the auxiliary discharge means 52 to eliminate clogging due to a large lump.

[0014]

Since the present invention is configured as described above, it has the following effects. (1) By making the core distance between the supply chute and the discharge chute of the airtight discharge device shorter than the distance of the bottom where the granules accumulate at the angle of repose α so that the granules are discharged by gravity fall. , It is no longer necessary to use compressed air as a discharge means, and even if the processing capacity (discharge amount) increases due to scale-up, it is possible to prevent deterioration of the performance (electric power consumption, fuel consumption) of the fluidized bed cement clinker burning device. it can. (2) By installing a discharge gate on the discharge chute side and adjusting the discharge amount of the granulated product by the opening area (gate opening) of the gate part, the discharge capacity can be continuously adjusted and stabilized. Continuous operation is possible. (3) Install an auxiliary gate on the horizontal part of the airtight discharge device and an exhaust gate on the discharge chute side, and adjust the discharge amount of the granulated product by the opening area (gate opening) of the gate part to achieve controllability with the auxiliary gate. By combining the discharge gates with the cutouts taken into consideration, the discharge amount of the granulated product can be easily adjusted. (4) In order that the height (pressure loss) of the material seal (airtight seal part) by the material (granulated material) becomes constant,
The granulated material can be continuously discharged and controlled, which increases the stability of the entire cement clinker firing device system. (5) The core distance between the supply chute and the discharge chute is short, and the required discharge amount of the granulated product can be grasped by the gate opening (opening area). Therefore, the airtight discharge device can be scaled up without increasing the size more than necessary. Up is possible. (6) When the airtightness due to the material (granulated material) is broken, it is easy to restore by fully closing the discharge gate (or / and auxiliary gate). (7) When a large lump generated in the fluidized bed furnace is clogged in the auxiliary gate or the discharge gate, compressed air can be blown out from a nozzle or the like installed as an auxiliary discharge means to remove the clogging due to the large lump.

[Brief description of drawings]

FIG. 1 is a schematic configuration cross-sectional explanatory view showing an airtight discharge device (a discharge gate is fully closed) in a fluidized bed cement clinker burning device according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional configuration diagram showing an airtight discharge device (the discharge gate is open) in the fluidized bed cement clinker firing device according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing an example (a fully closed state corresponding to FIG. 1) of the discharge gate in the first embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing an example (open state corresponding to FIG. 2) of the discharge gate in the first embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing another example of the discharge gate in the first embodiment of the present invention.

FIG. 6 is a schematic configuration cross-sectional explanatory view showing an example of a conventional airtight discharge device.

[Explanation of symbols]

10, 26 Airtight discharge device 12, 28 Supply chute 14, 30 Horizontal part 16, 32 discharge chute 18, 34 Material seal (airtight seal part) 20 Ejection means 22 Passage closing means 24, 50 Pressure gauge or pressure switch 36 discharge gate 38 Auxiliary gate 40 gate member 42, 42a Notch 44 opening 46, 48 axes 52 Auxiliary discharge means

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-199552 (JP, A) JP-A-6-277495 (JP, A) JP-A-2-229745 (JP, A) Actual development Sho-62- 167091 (JP, U) Actually open 62-144541 (JP, U) Actually open 6-47234 (JP, U) JP 58-32136 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) C04B 7/45

Claims (4)

(57) [Claims] 1. An airtight discharging device for air-tightly discharging granulated material from a fluidized bed furnace for granulating or granulating and firing cement raw material, wherein the airtight discharging device connects a vertical supply chute and a discharge chute with both chutes. The supply chute and the discharge chute are arranged with a center-to-center distance such that the length of the bottom surface of the horizontal part is shorter than the distance required for the granules to accumulate at the angle of repose α. A discharge gate with a variable opening area is installed on the discharge chute side so that the discharge amount of the granules that fall from the horizontal part to the discharge chute can be adjusted . Furthermore, the horizontal part between the discharge gate and the supply chute is installed. Upper part
In addition, the opening area can be changed to finely adjust the discharge amount of granules.
An airtight discharge device in a fluidized bed cement clinker calcination device, which is equipped with an auxiliary gate . 2. The airtight discharging device in a fluidized bed cement clinker burning device according to claim 1, wherein the discharging gate is provided with a notch for facilitating the adjustment of the discharging amount of the granulated material depending on the opening degree . 3. An auxiliary discharge means for blowing gas from the end surface of the horizontal part on the supply chute side to the horizontal part is provided so that the large lumps accumulated on the horizontal part can be blown off to the discharge chute side to eliminate clogging by the large lumps. The airtight discharging device in the fluidized bed cement clinker burning device according to claim 1 or 2 . 4. The granulated material is continuously discharged and controlled so that the height and / or pressure loss of the material seal due to the granulated material formed in the supply chute becomes constant. The airtight discharge device in the fluidized bed cement clinker calcination device according to 1 , 2, or 3 .