JP2662657B2 - Two-dimensional spouted bed granulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spouted bed granulating furnace for granulating raw material powders. More specifically, the present invention has a slit-type throat at the upper end and can be scaled up two-dimensionally. A possible spouted bed granulation furnace. INDUSTRIAL APPLICABILITY The present invention can be applied to granulation of a cement raw material, granulation of a raw material in production of ceramics, granulation of a raw material in production of a superconducting material, and the like.

[0002]

2. Description of the Related Art Heretofore, the present applicant has already developed a cement manufacturing apparatus in which a granulating furnace using a spouted bed and a firing furnace using a fluidized bed are combined. This conventional device,
The preheated cement raw material powder is subjected to hot self-granulation at a high temperature of 1300 ° C. or higher, and the granulated material is fired at a high temperature of 1400 ° C. or higher. Conventional spouted bed granulation furnaces have a circular cross section, and small-sized ones did not cause problems such as direct dropping of granules or excessive circulation.However, the furnace was scaled up and thrown. When the inner diameter of the throat is increased, for example,
At a time point of from 25 mm to 260 to 290 mm, the pressure fluctuation in the spouted bed increased, and the granular material dropped directly. When the flow rate was increased as a countermeasure, the circulation amount became excessive, and stable operation was not possible. For this reason, we are currently conducting research and development of a new type of spouted bed, a granulation furnace that is close to a fluidized bed. However, even in this new spouted bed, there are problems such as a low granulation speed and easy coaching.

[0003]

The conventional spouted bed granulation furnace has the following problems. (1) When the scale is increased, if the diameter of the throat is increased, the pressure fluctuation in the spouted bed will increase and the powder will fall directly from the throat. If the flow velocity is increased, the circulation amount will be excessive and the operation will be stable. Can not do. (2) If the scale-up is handled by multiplying a technically established small furnace, the equipment becomes complicated, leading to an increase in cost. (3) Due to the pulsation of the bed, a stable spout section (spout bed section) with a hot spot (high temperature section) cannot be obtained, and the particles in the moving bed section periodically enter the spout section and bring out the heat, so the injection is performed. Problems such as the inability to concentrate heat on the spout portion, unstable granulation, and frequent coaching occur. The present invention has been made in view of the above-mentioned points, and even if the furnace is scaled up , the stable operation is maintained without dropping the powder and granules and the circulation amount is excessive, and the input heat amount is reduced by the spout portion ( By concentrating on the spouted bed part), the granulation operation is performed at a high speed, and by feeding the raw material to the quiet layer interface, coaching due to scattering of the raw material is prevented, and the raw material input amount, moving bed height, and movement The granulated particle size can be controlled by changing the amount of powder and granular material supplied from the bed to the spouted bed, and the hot spot temperature can be controlled, and the scale of the furnace can be easily scaled up by expanding the size of the furnace two-dimensionally. It is an object of the present invention to provide a spouted bed granulation furnace that can perform the process.

[0004]

In order to achieve the above object, a spouted bed granulating furnace according to the present invention, as shown in FIG. 8, heats a raw material powder in a spouted state and granulates the spouted bed. In the granulation furnace, the cross section is almost rectangular and the slit type hot air
A furnace body 10 having an opening 12 and a lower end of the furnace body 10
It is connected to the hot air inlet 12 of lit type and scales up.
When the depth D is constant, the length is adjusted to the width of the furnace body .
The width W is two-dimensionally enlarged by the width W. The throat 22 has a substantially rectangular cross section. Further, the spouted bed granulation furnace of the present invention has the structure shown in FIG.
As shown in FIG. 5, in a spouted bed granulating furnace for heating and granulating raw material powder in a jet state, the cross section is substantially rectangular and the lower end is formed.
A furnace body 10 having a slit-type hot air inlet 12 at a portion thereof ;
It is connected to a slit-type hot air inlet 12 at the lower part of the furnace main body 10, and when the scale-up is performed, the depth D is constant and the furnace main body
Dimensions of the cross section by the length width W of matching the width
Throat 2 with a substantially rectangular cross section whose method expands two-dimensionally
2 and a panel-like partition member 26 for partitioning the layer so that it can communicate with the moving layer section 30 and the spouted layer section 28.

More specifically, the spouted bed granulation furnace of the present invention has a substantially rectangular cross section and a slit-type heat
Furnace body 10 having air inlet 12 and lower end of furnace body 10
And a substantially rectangular throat 22 having a constant depth D and a width W substantially equal to the width of the furnace main body, and a throat substantially above the throat 22 in the furnace main body 10. 22 or slightly inclined to the furnace body 10
A panel-shaped partition member 26 provided so as to form a gap 24 at a constant interval or an upwardly increased interval at a constant rate between the inner wall of the throat 22 and
A spouted bed portion 28 formed between one side surface of the partition member 26 and the inner wall of the furnace main body 10, a moving bed portion 30 formed between the other side surface of the partition member 26 and the furnace main body 10, And a winding section 32 formed between the throat 22 and the partition member 26 and in which a mixture of the particles and the raw material powder is wound from the moving bed section 30 into the spouted bed section 28.

[0006] In the spouted bed granulation furnace, the partition member 26 has a cooling structure as shown in FIGS. 4 and 5, or the air flows vertically and directly into the throat 22 as shown in FIG. 6. It is desirable to provide a rectifying plate 38 for preventing falling, or to provide a plurality of rectifying members 40 for preventing drift in the throat 22 in the vertical direction as shown in FIG. Further, by adjusting the height of the lower end of the partition member 26, the amount of winding into the spouted bed portion 28 can be controlled,
As shown in FIG. 4, it is desirable to provide an air nozzle 42 near the connection between the throat 22 and the furnace body 10 so as to control the amount of entrainment into the spouted bed portion 28.

[0007]

The raw material powder is introduced into the moving bed section 30 through the raw material inlet 16 and gradually descends while forming the moving bed. The lowered powder is applied to the lower winding portion 32 at the lower end of the partition member 26.
At the spout layer 28 by the hot air spouted from the throat 22
Get caught in In the spouted bed 28, the hot air from the throat 22 and the combustion gas from the burner 21 form a hot spot in a spouted state, and the powder and granules entrained therein are heated to form an aggregate of powders. The particles are enlarged by hot self-granulation or melting of the powder attached around the particles. The particles that have risen in a spouted state in the spouted bed portion 28 while being granulated fall on the moving bed portion 30 through between the upper end of the partition member 26 and the ceiling portion of the furnace main body, and the granulated material outlet 18
Extracted from At this time, the large-diameter particles tend to fall near the granulated material outlet 18 due to the centrifugal force, and thus the large-diameter particles are mainly extracted from the granulated material outlet 18. The remaining particles descend in the moving bed 30, and in the process, a part of the raw material adheres to the surroundings. In the remaining raw materials, the raw powders are aggregated. The mixture thus lowered is subjected to the above-described operation again. In this manner, a stable spout portion (spouted bed portion) 32 and a hot spot can be obtained, and particles in the moving bed portion periodically enter the spout portion and do not take out heat from the spout portion. And the temperature of the moving bed section 30 does not rise due to the entrainment of particles from the spouted bed section, but is cooled by mixing with the raw material powder. In addition, the interface of the moving layer becomes quiet, and the scattering of the input raw material can be prevented. By adjusting the height between the lower end of the partition member 26 and the throat 22, it is possible to change the particle entrainment amount.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. However, the shapes of the constituent members described in this embodiment, the relative arrangement thereof, and the like are not intended to limit the scope of the present invention only to them, unless otherwise specified. It's just 1 to 3, reference numeral 10 denotes a furnace main body having a substantially rectangular cross section, a slit-shaped hot air inlet 12 at a lower portion, an exhaust gas outlet 14 at an upper or upper portion, and a plurality of raw material inlets at a side or upper portion. 16 has a plurality of granulated material outlets 18 at positions shifted laterally from the raw material inlet. One side of the furnace body 10 is suspended in the vertical direction to the hot air inlet 12 of the slit type, other aspects of the furnace body 10, inclined surfaces 20 leading to the hot air inlet 12 of the slit type is formed. A burner 21 is provided near the hot air inlet 12.

The slit-shaped hot air inlet 12 at the lower end of the furnace body 10 has a depth D of about 10 to 15 cm and a constant width W.
Is connected to a substantially rectangular throat 22 having the same length as the furnace width.
Combined by designing the width (length) W of the throat 22, the size of the cross section is in so that to expand two-dimensionally. That is, the depth D is limited to a range in which the problem of the powder falling directly and the excessive circulation amount does not occur, and only the width W is increased.
By expanding the cross-sectional dimension in a two-dimensional manner, it is possible to avoid the problems of the conventional spouted bed granulation furnace and to increase the scale. In the furnace body 10, a panel is formed substantially above the throat 22, in parallel with the throat 22, so as to form a gap 24 between the furnace body 10 and the furnace body 10 at a fixed interval or at a fixed rate that is increased at a fixed rate in the upward direction. A partition member 26 is provided. On the upper side of the throat 22, a spouted layer portion 28 is formed between the one side surface of the partition member 26 and the furnace body 10, that is, in the gap 24, and the spout layer portion 28 is formed between the other side surface of the partition member 26 and the furnace body 10. The moving layer portion 30 is formed therebetween. From a portion 32 between the upper end of the throat 22 and the lower end of the partition member 26, a mixture of particles and raw material powder is drawn into the spouted bed portion 28 from the moving bed portion 30. That is, this part 32 is a winding part 32.

As shown in FIG. 4 and FIG.
In order to secure the heat resistance of the above, it is preferable that the partition member 26 is formed in a hollow shape, and a cooling pipe 36 is inserted into the hollow portion 34 to have a water-cooled or air-cooled structure. In addition, it is also possible to make the partition member a jacket type and perform water cooling or air cooling.
In addition, as shown in FIG. 6, if necessary, the throat 22
A rectifying plate 38 (for example, a perforated plate for giving a pressure loss) for preventing drift and direct drop in the horizontal direction is installed in the inside of the throat 22, and a plurality of rectifying plates 38 for preventing drift in the vertical direction in the throat 22 as shown in FIG. Are provided at appropriate intervals. Further, in order to set the amount of winding from the winding portion 32 to the spouted bed portion 28, the height of the lower end of the partition member 26 is adjusted, or the vicinity of the connection portion between the throat 22 and the furnace body 10, for example, the inclined surface 20 Next, as shown in FIG.
And air is blown.

FIG. 8 shows another embodiment of the spouted bed granulator of the present invention. In this embodiment, a substantially rectangular throat 2 having a constant depth D and a width W substantially equal to the width of the furnace main body is provided at the lower end of the furnace main body 10 without providing a partition member in the furnace main body 10.
2 are connected to each other, so that the moving bed 30
And the spouted layer portion 28 are formed. Other configurations are the same as those in the above-described embodiment.

[0012]

As described above, the present invention has the following effects. (1) Since the scale can be increased by increasing the width (length) of the throat, design is easy and the risk is small. (2) Since the depth of the throat is a limited and constant value, pressure fluctuations are reduced, and it is difficult for powders to drop directly, and the circulation amount is reduced. (3) Stable spouts and hot spots are formed, reducing the required heat input. For this reason, the temperature of the spouted bed portion and the temperature of the moving bed portion are also reduced, the durability of the apparatus is improved, and the coaching is reduced. (4) Since the amount of heat required to be supplied to the spout portion per the amount of the granulated product is reduced, the production amount can be increased even with an apparatus having the same size. (5) Since the spout and the hot spot are stable,
Granulation is stabilized and the granulation speed is increased. (6) Since the moving layer has a quiet interface, the scattering of the input raw material powder is reduced, and the coating at the gas outlet and the raw material input is reduced. (7) Even if the bed height of the moving bed portion is increased, the pressure loss does not increase so much. Therefore, the bed height can be changed according to the load, and the raw material powder concentration in the particles can be kept constant. (8) The supply amount of the mixture of the particles and the raw material powder to the spout portion can be controlled.

[Brief description of the drawings]

FIG. 1 is an elevational sectional view showing one embodiment of a spouted bed granulation furnace of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

FIG. 4 is an elevational sectional view showing another embodiment of the spouted bed granulation furnace of the present invention.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is a vertical sectional view showing an example of a throat in the spouted bed granulation furnace of the present invention.

FIG. 7 is a plan sectional view showing another example of the throat in the spouted bed granulation furnace of the present invention.

FIG. 8 is a vertical sectional view showing still another embodiment of the spouted bed granulation furnace of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Furnace main body 22 Throat 24 Gap 26 Partition member 28 Spout bed part 30 Moving bed part 32 Parting part of granular material in spout bed part 38 Rectifier plate (perforated plate) 40 Rectifier member (partition member) 42 Air nozzle D throat Depth W Throat width (length)

Claims (8)

(57) [Claims] In a spouted bed granulating furnace for heating and granulating raw material powder in a jet state, a slit-shaped hot air inlet (1) has a substantially rectangular cross section and a lower end portion.
A furnace main body (10) having a hot air inlet (1 ) at the lower end of the furnace main body (10);
2) Connect the depth (D) when scaling up
The cross-section dimension is expanded two-dimensionally by making the width (W) of the length corresponding to the width of the furnace body constant, and the cross-section is composed of a throat (22) having a substantially rectangular shape. 2D spouted bed granulation furnace. 2. A spouted bed granulation furnace for heating and granulating raw material powder in a jet state, wherein a hot air inlet (1) having a substantially rectangular cross section and a slit- shaped lower end is provided.
A furnace body (10) having 2); a slit-type hot air inlet (12) at the lower part of the furnace body (10);
And depth (D) is fixed when scaling up
A throat (22) having a substantially rectangular cross section whose cross section dimension is expanded two-dimensionally by setting the width (W) to a length corresponding to the width of the furnace body , and a moving layer portion ( And a panel-shaped partition member (26) that communicably communicates with the spout bed section (30) and the spout bed section (28). 3. A spouted bed granulation furnace for heating and granulating raw material powder in a jet state, wherein a hot air inlet (1) having a substantially rectangular cross section and a slit at its lower end is provided.
A furnace main body (10) having a hot air inlet (1 ) at the lower end of the furnace main body (10);
Is connected to 2), the depth (D) substantially equal length substantially rectangular throat of constant width (W) is the width of the furnace body (22), in the furnace body (10), the throat (22) A gap (24) is formed at a substantially constant distance from the inner wall of the furnace main body (10) at a constant interval or at a constant rate in the upward direction at a substantially upper side of the throat (22). Bed member (26) provided as described above, and a spouted bed portion (2) formed between one side surface of the partition member (26) and the furnace body (10) above the throat (22).
8), a moving layer portion (30) formed between the other side surface of the partition member (26) and the furnace body (10), and a moving layer portion (30) formed between the throat (22) and the partition member (26). And a winding part (32) in which a mixture of particles and raw material powder is wound from the moving bed part (30) into the spouted bed part (28). 4. The partition member (26) has a cooling structure.
請 Motomeko 2 or 3 dimensional spouted bed granulating furnace according that. 5. A throat (22) two-dimensional spouted bed granulating furnace 請 Motomeko 1, 2 or 3, wherein the current plate for direct drop preventing channeling and particles (38) provided horizontally in the. 6. throat (22) two-dimensional spouted bed granulating furnace of a plurality of 請 Motomeko 1, wherein providing the flow control member (40) for preventing drift in the vertical direction within. 7. By adjusting the lower end height of the partition member (26), two-dimensional spouted bed granulation of 請 Motomeko 2 or 3, wherein was set to control the amount entrainment jet layer unit (28) Grain furnace. 8. An air nozzle (42) is provided near the connection between the throat (22) and the furnace body (10),
The two-dimensional spouted bed granulation furnace according to claim 1, 2 or 3, wherein the amount of entrainment into the spouted bed portion (28) is controlled.