JPH0589428U - Packed bed cooler - Google Patents

Abstract

(57) [Summary] [Purpose] To stably control the air flow rate in a firing system with a packed bed cooler. An upper cooling layer 24, which is connected to the lower end of the rotary kiln 4 through a connection port 17 and has a narrowed portion 28 at the lower end, and an upper cooling layer 24 connected to the lower end of the narrowed portion 28 of the upper cooling layer 24. A cooling air chamber 25 having a cross section larger than that of 28, a cooling air supply pipe 30 connected to an upper end shoulder 29 of the cooling air chamber 25, and a lower outer periphery of the cooling air chamber 25 are provided so as to surround the cooling air chamber 25. Cooling air supply device 34 inside
And a backflow prevention wall 32 connected to the lower end of the cooling air chamber 25 so as to project into the lower cooling layer 26.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packed bed cooler.

[0002]

[Prior Art]

Conventionally, in the cement manufacturing industry and the iron-making industry that uses quicklime as an auxiliary material, cement clinker and limestone (CaCO ₃ ) are burned using a rotary kiln, and the burned high-temperature burned mass is cooled in the atmosphere, The air after cooling (heat exchange) is used as the air for firing the rotary kiln.

FIG. 7 is an overall view showing an example of a cement clinker manufacturing apparatus that has been conventionally practiced, and includes a floating preheater 3 having a multistage cyclone 1 and an uppermost end connected to a main exhauster 2. , A rotary kiln 4 which is rotatably provided at a required inclination angle and whose upper end is connected to the final stage cyclone 1, and a calcining furnace 5 which is connected to the upper end of the rotary kiln 4 and the final stage cyclone 1. And a great type cooler 8 connected to the lower end of the rotary kiln 4 and cooling the calcined lump (cement clinker) 7 by cooling air 6 introduced from the lower side. It has a configuration provided with an extraction duct 9 for guiding a part of the heated cooling air 6 to the calcining furnace 5. Reference numeral 10 represents a dust separator, and 11 represents a kiln burner.

The burned mass 7 guided to the rotary kiln 4 and burned at about 1400 ° C. by the combustion of the kiln burner 11 is put into a great cooler 8 and cooled to about 100 ° C.

However, in the above-described conventional great-type cooler 8, the fired mass 7 is received by the lattice plate, and the cooling air 6 supplied from the lower side is cooled while being conveyed in the horizontal direction as a relatively thin layer. Since the configuration is such that the firing mass 7 and the cooling air 6 are in contact with each other for a short time, the heat exchange efficiency is low, the cooling efficiency is poor when viewed from the firing mass 7 side, and the heat is not seen when viewed from the cooling air 6 side. There was a problem of poor collection efficiency. Further, as described above, since the cooling efficiency is poor, a large amount of cooling air 6 is required, and the air after cooling becomes an excess, so that the cooling air 6 on the low temperature side is discharged to the outside from the chimney 13 via the electrostatic precipitator 12. As a result, consumption power has also increased. Further, since the great type cooler 8 has a complicated structure in which it receives and moves the fired mass 7 by means of a lattice plate, it is prone to failure and has a problem that it cannot withstand continuous operation for a long time.

For this reason, in recent years, it has been proposed to cool the above-mentioned fired mass 7 by a packed bed cooler 14 as shown in FIG. That is, as shown in FIG. 8, in the circumferential direction of the downstream end 15 of the rotary kiln 4, a plurality of openings 16 having a size capable of dropping the fired mass 7 of a predetermined size or less are opened. The packed bed cooler 14 is connected to the lower portion via a connection port 17. The packed-bed cooler 14 is provided with a hopper-shaped cooling layer 18 whose lower end is reduced in diameter at a lower portion of a connection port 17, and a cooling air fan 19 to a cooling air supply pipe 22 is provided inside the cooling layer 18. In order to uniformly supply the cooling air 6 introduced through the cooling layer 18 to the cooling layer 18, as shown in FIGS. 9 and 10, when the cooling layer 18 has a circular horizontal cross-sectional shape, a umbrella 20 may be provided. As shown in FIGS. 11 and 12, when the cooling layer 18 has a rectangular horizontal cross-section, a mountain-shaped beam 21 is provided. Furthermore, a table feeder is provided at the lower end of the cooling layer 18. Alternatively, an ejector 23 such as a vibration feeder is provided.

[0007]

[Problems to be solved by the device]

 However, in the cooling layer 18, since the internal structures such as the umbrella 20 and the chevron beams 21 provided inside come into direct contact with the fired mass 7 at around 1400 ° C., these internal structures are There were problems such as burnout or significant wear due to contact with the ingot 7 at high temperatures.

In addition, in the cooling layer 18, not only the cooled ingot 7 is simply cooled but also the rapid cooling is performed to prevent welding (agglomeration) of the baked ingot 7 or change the crystal structure. Although it is necessary to serve the purpose, it was very difficult to evenly distribute the cooling air 6 in the cooling layer 18. Normally, the fired mass 7 does not have the same diameter and the same shape, but has a wide particle size distribution, and therefore a portion that is easy to cool and a portion that is difficult to cool are mixed. On the other hand, since the fired mass 7 in the cooling layer 18 falls (collapses) under its own weight, it is easy to create a drift in the cooling layer 18 without dropping at the same speed, and this drift causes a large temperature especially in the upper part where quenching is performed. In this case, unevenness occurs, and further, if there is an uneven product in the particle size distribution, it becomes more difficult to perform uniform cooling, and the temperature of the fired mass 7 discharged from the cooling layer 18 fluctuates greatly. There is a problem that it decreases.

The present invention has been made in view of the above-mentioned problems of the conventional device, and has a narrowed portion below the upper cooling layer without providing a built-in structure in the upper cooling layer with a plurality of cooling layers. A cooling air chamber is formed through the cooling air chamber and the cooling air is supplied from the cooling air chamber toward the throttle portion in the circumferential direction, so that the burned mass can be uniformly cooled without causing problems such as burnout or wear of the built-in structure. A packed bed cooler that enables rapid cooling) and suppresses the uneven flow of the cooling air to achieve more uniform cooling (quick cooling) by the configuration of the compartment connected to the separate cooling air tube provided in the cooling air chamber. The purpose is to provide.

[0010]

[Means for Solving the Problems]

 The present invention relates to an upper cooling layer, which is connected to the lower end of a rotary kiln through a connection port and has a throttle portion formed at the lower end, and is connected to the lower end of the throttle portion of the upper cooling layer and is larger than the cross section of the throttle portion. A cooling air chamber having a cross section, a cooling air supply pipe connected to an upper end shoulder of the cooling air chamber, and a cooling air supply device provided so as to surround a lower outer periphery of the cooling air chamber and provided inside thereof. A packed-bed cooler comprising a lower cooling layer having a bleed duct connected to the upper shoulder and a backflow prevention wall connected to the lower end of the cooling air chamber so as to project into the lower cooling layer. 2. The packed bed according to claim 1, further comprising: a partition plate provided so as to partition the inner upper side of the cooling air chamber into a plurality of compartments, and a cooling air supply pipe connected to each of the compartments. It is related to the formula cooler.

[0011]

[Action]

 In the invention of claim 1, the calcined mass that has fallen from the lower end of the rotary kiln into the upper cooling layer through the connection port is supplied by the cooling air supply pipe connected to the upper shoulder of the cooling air chamber, and the upper cooling layer After being uniformly cooled (rapidly cooled) by the cooling air that is uniformly supplied from the outer periphery toward the throttle part of the and rises, it falls into the lower cooling layer connected to the lower part of the cooling air chamber, and further inside the lower cooling layer. In this case, the cooling air is uniformly cooled to a low temperature by the cooling air supplied by the cooling air supply device. At this time, since a backflow prevention wall is formed by projecting the lower end of the cooling air chamber into the lower cooling layer, the cooling air supplied to the upper end shoulder of the cooling air chamber may flow back to the lower cooling layer. This is prevented, and cooling (quick cooling) in the throttle portion can be effectively performed.

According to the second aspect of the present invention, the cooling air is supplied from the cooling air supply pipe to each of the plurality of compartments formed on the upper side of the inside of the cooling air chamber, so that the drift of the cooling air is suppressed. The cooling air is uniformly dispersed toward the throttle portion, and the cooling (rapid cooling) is further uniformly performed.

[0013]

【Example】

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

1 and 2 show an embodiment of the packed bed cooler of the present invention, in which a calcined mass 7 having a predetermined size or smaller can be dropped in the circumferential direction of the downstream end 15 of the rotary kiln 4. A plurality of openings 16 each having a size are opened, and a packed bed cooler 27 including an upper cooling layer 24, a cooling air chamber 25, and a lower cooling layer 26 is connected to a lower portion of the opening 16 via a connection port 17. is doing.

The upper cooling layer 24 has a configuration in which the upper end has the connection port 17 and the lower end has a narrowed portion 28.

The cooling air chamber 25 has a larger cross section than that of the throttle portion 28 of the upper cooling layer 24 and is connected to the lower end of the throttle portion 28. A cooling air supply pipe 30 is connected to the cooling air supply pipe 30, and the cooling air supplied to the cooling air chamber 25 by the cooling air supply pipe 30 is cooled when it is introduced into the upper cooling layer 24 through the throttle portion 28. The fired mass 7 descending in the layer 24 is cooled (quenched). Further, the lower end of the cooling air chamber 25 is also formed in a required throttle shape.

The lower cooling layer 26 is fixed to the outer periphery of the lower portion of the cooling air chamber 25 with a large cross section so as to surround the cooling air chamber 25, and the upper shoulder 31 of the lower cooling layer 26 is fixed. The air extraction duct 9 connected to the calcination furnace 5 shown in FIG. Further, a throttle-shaped backflow prevention wall 32 connected to the lower end of the cooling air chamber 25 is provided so as to project into the lower cooling layer 26, and is cooled by the cooling air supply pipe 30 by the backflow prevention wall 32. The cooling air 6 supplied to the air chamber 25 is prevented from flowing back into the lower cooling layer 26.

Further, the lower cooling layer 26 is composed of two hoppers 33 whose lower ends are narrowed in the illustrated case, and the dischargers 23 such as a table feeder or a vibration feeder are provided at the lower ends of the hoppers 33, respectively. ing. Further, the packed bed cooler 27 of FIG. 1 has a generally circular horizontal cross-sectional shape at each part, and therefore, inside the lower cooling layer 26, a cooling air supply pipe 22 provided at a side portion is connected. Further, a cooling air supply device 34 composed of a plurality of umbrellas 20 is provided so that the fired mass 7 inside can be uniformly cooled to a low temperature.

The packed-bed cooler 27 shown in FIGS. 1 and 2 has a generally horizontal cross-sectional shape that is substantially circular, so that the inside of the upper end shoulder 29 of the cooling air chamber 25 is the rest of the fired mass 7. An annular freeboard portion (space portion) 35 is formed by the corners, so that the cooling air 6 is supplied to this freeboard portion 35 from one cooling air supply pipe 30 as shown in FIG. However, the cooling air 6 can be uniformly supplied to the throttle portion 28 from the circumferential direction. Further, since the freeboard portion 36 is formed inside the upper end shoulder portion 31 of the lower cooling layer 26, the cooling air of the freeboard portion 36 is taken out by the extraction duct 9.

Next, the operation will be described.

The calcined mass 7 at around 1400 ° C. that has fallen from the lower end of the rotary kiln 4 into the upper cooling layer 24 through the opening 16 and the connection port 17 is connected to the upper shoulder 29 of the cooling air chamber 25. After being supplied from the air supply pipe 30 to the freeboard portion 35 of the cooling air chamber 25 and uniformly cooled (rapidly cooled) by the cooling air 6 which rises uniformly from the circumferential direction toward the throttle portion 28 by the freeboard portion 35. , Through the cooling air chamber 25 and falls into the lower cooling layer 26 connected to the lower part. At this time, the cooling air 6 that has been heated to a high temperature by cooling the calcined ingot 7 in the upper cooling layer 24 is introduced into the rotary kiln 4 through the opening 16 and provided as combustion air for firing.

The fired mass 7 that has fallen into the lower cooling layer 26 is uniformly cooled to a low temperature by the cooling air 6 supplied by the cooling air supply device 34.

In the above cooling, since there is no built-in structure in the upper cooling layer 24 as in the conventional case, there is no problem such as burnout or wear of the built-in structure, and the lower cooling layer 26 has a structure. Although a cooling air supply device (internal structure) 34 such as the umbrella 20 is provided, since the fired mass 7 falling into the lower cooling layer 26 has already been cooled to around 700 ° C. by the upper cooling layer 24, The cooling air supply device 34 does not burn out or wear significantly.

Since a backflow prevention wall 32 is provided at the lower end of the cooling air chamber 25 so as to project into the lower cooling layer 26, the cooling air supply pipe 30 supplies the cooling air chamber 25 with the cooling air chamber 25. Since the backflow prevention wall 32 can prevent the generated cooling air 6 from flowing back into the lower cooling layer 26, the upper cooling layer 24 can be effectively cooled.

FIGS. 3 and 4 show another embodiment of the packed bed cooler 27 shown in FIGS. 1 and 2, wherein the entire horizontal cross-sectional shape of the packed bed cooler 27 is approximately rectangular. In this case, as shown in FIG. 4, the freeboard portion 35 of the cooling air chamber 25 is divided into right and left, so that cooling air can be supplied to the respective freeboard portions 35, 35. The two cooling air supply pipes 30 and 30 are connected to each other, and the cooling air supply device 34 composed of the chevron-shaped beam 21 is provided in the lower cooling layer 26. 1 and the case of FIG.

FIG. 5 and FIG. 6 show an embodiment of the invention of claim 2, and FIG. 5 shows that the freeboard part is inserted into the upper part of the inside of the cooling air chamber 25 of FIG. A partition plate 38 is provided so as to partition the 35 at equal intervals in the circumferential direction to form partition chambers 37, and a cooling air supply pipe 41 is connected to each of the partition chambers 37 partitioned by the partition plate 38. ing. 6 shows that the left and right freeboard portions 35, 35 are divided into a plurality of compartments 39 at equal intervals in the upper part of the inside of the cooling air chamber 25 of FIG. A partition plate 40 configured to be formed is provided, and a cooling air supply pipe 41 is connected to each of the compartments 39 partitioned by the partition plate 40.

According to the configurations of FIGS. 5 and 6, the cooling air 6 is supplied from the cooling air supply pipe 41 to each of the plurality of compartments 37 and 39 formed on the upper side inside the cooling air chamber 25. As a result, the uneven flow of the cooling air 6 is suppressed, and the cooling air 6 is uniformly oriented toward the narrowed portion 28, so that the calcined ingot 7 is cooled (rapidly cooled) more uniformly. ..

The present invention is not limited to the above-described embodiment, but can be applied to the cooling of a fired mass other than the cement clinker, and the lower cooling layer may be configured in a plurality of stages. Needless to say, various changes can be made without departing from the scope of the present invention.

[0029]

[Effect of the device]

 According to the first aspect of the present invention, the cooling air chamber is formed in the lower portion of the upper cooling layer through the narrowed portion without installing the built-in structure in the upper cooling layer by providing the cooling layers in a plurality of stages. Since the cooling air supplied from the upper shoulder of the unit is supplied from the circumferential direction toward the throttle unit, the burned mass can be cooled uniformly and effectively without causing problems such as burnout or wear of the built-in structure. (Quenching) can be performed. Also, a cooling air supply device is provided in the lower cooling layer, but since the calcined lump falling into the lower cooling layer has already been cooled by the upper cooling layer, the cooling air supply device burns out or is significantly abraded. There is no problem of wear.

Further, the backflow prevention wall provided at the lower end of the cooling air chamber so as to project into the lower cooling layer prevents the cooling air supplied to the cooling air chamber from flowing back into the lower cooling layer. Therefore, the cooling effect of the upper cooling layer can be enhanced.

In the invention of claim 2, since the cooling air from the cooling air supply pipe is supplied to each of the plurality of compartments formed on the upper side inside the cooling air chamber, the cooling air causes a non-uniform flow. Instead, it is uniformly dispersed toward the narrowed portion, so that the cooling (quick cooling) is performed more uniformly.

[Brief description of drawings]

1 is a cut-away side view showing an embodiment of the invention of claim 1;

2 is a view taken along the line II-II of FIG.

FIG. 3 is a perspective view showing another embodiment of the device of claim 1.

FIG. 4 is a view taken along the line IV-IV in FIG.

5 is a horizontal sectional view showing an embodiment of the invention of claim 2 applied to the apparatus of FIGS. 1 and 2. FIG.

6 is a horizontal sectional view showing another embodiment of the device of claim 2 applied to the apparatus of FIGS. 3 and 4. FIG.

FIG. 7 is an overall view showing an example of a conventional cement clinker manufacturing apparatus.

FIG. 8 is a cut side view showing an example of a packed bed cooler that has been considered in recent years.

FIG. 9 is a cut side view showing an example in which the horizontal cross-sectional shape of the packed-bed cooler is circular.

10 is a view on arrow XX in FIG. 9. FIG.

FIG. 11 is a cut side view showing an example in which the horizontal cross-sectional shape of the packed-bed cooler is rectangular.

FIG. 12 is a view on arrow XII-XII in FIG. 11.

[Explanation of symbols]

 4 Rotary Kiln 9 Extraction Duct 17 Connection Port 24 Upper Cooling Layer 25 Cooling Air Chamber 26 Lower Cooling Layer 27 Packed Layer Cooler 28 Throttling Section 29 Upper End Shoulder 30 Cooling Air Supply Pipe 31 Upper End Shoulder 32 Backflow Prevention Wall 34 Cooling Air Supply Device 37 Compartments 38 Partitions 39 Compartments 40 Partitions 41 Cooling Air Supply Pipes

Claims (2)

[Scope of utility model registration request] 1. An upper cooling layer which is connected to a lower end of a rotary kiln through a connection port and has a throttle portion formed at the lower end, and an upper cooling layer which is connected to a lower end of the throttle portion of the upper cooling layer and is larger than a cross section of the throttle portion. A cooling air chamber having a cross section, a cooling air supply pipe connected to the upper end shoulder of the cooling air chamber, a cooling air supply device provided so as to surround a lower outer periphery of the cooling air chamber, and a cooling air supply device provided inside the cooling air chamber. A packed bed cooler comprising: a lower cooling layer having a shoulder connected with an extraction duct; and a backflow prevention wall connected to a lower end of the cooling air chamber so as to project into the lower cooling layer. 2. A partition plate provided so as to partition the inside upper side of the cooling air chamber into a plurality of compartments, and a cooling air supply pipe connected corresponding to each of the compartments. The packed bed cooler described.