JPS6145155B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a preheating device for powder and granular materials.

A suspension type preheating device, which is equipped with one or more cyclone type heat exchangers attached to a conventional material-calcining kiln, suspends and swirls the material to be preheated within the cyclone by high-temperature exhaust gas discharged from the kiln. If the material to be preheated is a relatively light powder, it can be sufficiently suspended and swirled to preheat it, but if the material is relatively heavy, it cannot be sufficiently preheated because it does not float and swirl. . Therefore, for example, when preheating sand (powder with a diameter of 4 mm or less) or gravel (granular material with a diameter of 4 to 15 mm) to be used as artificial lightweight aggregate for concrete, it is necessary to A separate preheating device (for body use) is required.

In view of the above circumstances, the present applicant first filed an application for a powder preheating device that can efficiently preheat both relatively light powder and relatively heavy granules using the same device. did. Such an apparatus is shown in FIGS. 1 and 2. The apparatus shown in the figure is a powder granule in which at least one cyclone of a suspension type preheating device is configured as a dual-purpose cyclone type heat exchanger to function as a granule heat exchanger and a suspension type powder heat exchanger. FIG. 1 shows the case of preheating granules, and FIG. 2 shows the case of preheating powder.

In the figure, 1 is a feeder for granules, 2 is an aerodynamic damper, 3 is a hopper for granules, and 4 is a first cyclone configured as a dual-purpose cyclone type heat exchanger. An open inner cylinder 5 is provided, and a packed bed heat exchanger 6 is provided in the inner cylinder 5 as a heat exchanger for granules, and the granules supplied to the hopper 3 are transferred to the packed bed heat exchanger 6.
It is designed so that it passes through the inside. A chute branched into two is provided at the lower part of the first cyclone 4, and a first seal damper 7 as a chute switching means is provided at the branch point, and one of the granule chute 8 is communicated with the inside of the kiln 9. A variable speed vibrating feeder 10 for granules is provided in the middle. The other powder chute 11 is connected to the second cyclone 1 described below.
It is connected to 8. Further, 12 is a supply feeder for powder, 13 is an air damper, 14 is a hopper for powder, 15 is a variable speed vibration feeder for powder, 16 is a chute for powder, and 17 is a duct for high temperature gas. The duct 17 communicates with the first cyclone 4 and the second cyclone 18, and communicates with the powder chute 16 in the middle thereof, and a dispersion plate 19 is provided at the communicating point. A chute branched into two is provided at the lower part of the second cyclone 18, and a second shield damper 20 for switching the chute is provided at the branching point.One powder chute 21 communicates with the inside of the kiln 9, and the other dust chute 22
is communicated with the dust tank, and a rotary leaf feeder 23 is provided in the middle. 24 is a kiln bottom housing; 25 is a high-temperature gas duct that communicates with the housing 24 and the second cyclone 18;
The powder chute 11 is communicated in the middle of the duct 25, and a dispersion plate 26 is provided at the communicating point. Reference numeral 27 denotes a high-temperature gas discharge duct that communicates with the packed bed heat exchanger 6 in the first cyclone.

First, the case of preheating the granules will be explained according to FIG. In this case, the powder supply feeder 12 and the variable speed vibration feeder 15 are stopped, the aerodynamic damper 13 is closed, the first seal damper 7 is sent to the granule chute 8, and the second seal damper 2 is
0 is switched to the dust chute 22. The granules are transported from feeder 1 to aerodynamic damper 2.
It is supplied to the hopper 3 through the first cyclone, and is discharged into the kiln 9 through the packed bed heat exchanger 6, the chute 8, and the vibration feeder 10. In this case, the vibrating feeder 10 is adjusted so that the granules form a packed bed in the packed bed heat exchanger 6. On the other hand, high temperature gas discharged from the kiln 9 passes from the kiln bottom housing 24 through the duct 25 to the second
The gas enters the cyclone 18, becomes a swirling flow within the cyclone 18, is separated from the dust in the gas, and enters the first cyclone 4 through the duct 17. The separated dust is discharged into a dust tank through a chute 22 at the bottom of the cyclone and a rotary leaf feeder 23. The high temperature gas that has entered the first cyclone 4 is connected to the outer wall 4a of the cyclone 4 and the inner cylinder 5.
It flows to the lower part of the cyclone while swirling between the two, passes through the packed bed heat exchanger 6, and is discharged from the duct 27. In this case, the granules form a packed bed in the packed bed heat exchanger 6, and the high temperature gas passes through the packed bed in a direction perpendicular to the packed bed to efficiently preheat the granules.

Next, the case of preheating the powder will be explained according to FIG. In this case, it is sufficient to function as a normal suspension type preheating device, and the powder supply feeder 1 and variable speed vibration feeder 10 are stopped.
The airlock damper 2 is closed, and the first and second seal dampers 7, 20 are both connected to the powder chute 11,
Switch to 21. The powder is fed from the supply feeder 12 through the air damper 13 to the hopper 14, fed into the chute 16 by the variable speed vibrating feeder 15, dispersed by the distribution plate 19, and heated to the hot gas in the duct 17 as described below. and enters the first cyclone 4. Inside the cyclone 4, powder suspended by high-temperature gas is preheated while swirling between the cyclone outer wall 4a and the inner cylinder 5, falls below the cyclone, and is sent to the chute 11 through the damper 7. . Shoot 1
The powder sent to the second cyclone 18 is dispersed by the dispersion plate 26 and sent to the second cyclone 18 together with the high temperature gas in the duct 25 described below, and the powder suspended by the high temperature gas is distributed together with the high temperature gas. 2, rotates in the cyclone 18, is further preheated, falls to the lower part of the cyclone, passes through the damper 20 and the chute 21, and is discharged into the kiln 9. On the other hand, kiln 9
The high temperature gas discharged from the kiln bottom housing 2
4, passed through the duct 25 from the chute 11, suspended the powder, entered the second cyclone 18, rotated within the cyclone 18 to preheat the powder, passed through the duct 17, and flowed in from the chute 16 again. The powder is suspended and enters the first cyclone 4, and after preheating the powder while swirling in the cyclone 4 as described above, it is discharged through the packed bed heat exchanger 6 and the discharge duct 27. Ru.

As mentioned above, the powder preheating device filed earlier is
At least one cyclone heat exchanger of the suspension type preheating device is configured as a dual-purpose cyclone type heat exchanger to act as a granule heat exchanger and a suspension type powder heat exchanger. In the case of heavy granules, the function of the cyclone as a suspension-type powder heat exchanger is used, and in the case of heavy granules, the function as a granule heat exchanger is used. However, even heavy particles can be efficiently preheated by using the same preheating device and simply by switching dampers, resulting in many economic benefits such as fuel costs, equipment costs, work efficiency, etc. can.

However, in the powder/granular material preheating device configured as described above, whether or not it is possible to efficiently preheat the powder or granules depends on how the dual-purpose cyclone heat exchanger is configured. . In the dual-purpose cyclone heat exchanger shown in Figures 1 and 2, the high-temperature gas comes into contact (heat exchange) with the particles only once, but it has been improved so that this contact occurs multiple times. If so, the granules can be preheated more efficiently.

In view of the above circumstances, the present invention provides a powder/granular material preheating device as described above, in which a dual-purpose cyclone type heat exchanger is configured such that the granular material and high-temperature gas come into contact with each other multiple times within the heat exchanger. The object of the present invention is to provide a preheating device for powder and granular materials that can efficiently preheat granular materials. In a powder preheating device configured as a cyclone-type heat exchanger for powder and granular materials to function as a heat exchanger for powder and a suspension-type heat exchanger for powder, the cyclone-type heat exchanger An inner cylinder with an open bottom surface is provided within the outer cylinder, and a plurality of outer conical rings whose diameter increases upward are arranged in the inner cylinder at predetermined intervals in the vertical direction, and the outer conical rings are directed downward within the outer conical ring. A plurality of inner conical rings whose diameters have been increased are arranged at predetermined intervals in the vertical direction, and the partition wall provided between the inner cylinder and the outer conical ring and the partition wall provided within the inner conical ring are arranged vertically with respect to each other. A powder preheating device is characterized in that the heat exchangers are arranged alternately.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

FIG. 3 is a conceptual longitudinal cross-sectional view showing an embodiment of the dual-purpose cyclone type heat exchanger of the powder/granular material preheating device according to the present invention, and this heat exchanger is a first cyclone type heat exchanger shown in FIGS. 1 and 2. This is used in place of 4. The dual-purpose cyclone type heat exchanger 4 shown in the figure has an inner cylinder 5 with an open bottom surface inside the cyclone outer cylinder 4a, and an outer conical ring 28 whose diameter increases upward is installed in the inner cylinder 5 in a predetermined direction in the vertical direction. A plurality of inner conical rings 29 are arranged at intervals and have a diameter increasing downward within the outer conical ring.
Similarly, a plurality of are arranged at predetermined intervals in the vertical direction, and further an inner cylinder 5 and an outer conical ring 28 are arranged.
There is one or more sheets (in this example, two sheets) between
) A partition wall 30 is provided, and an inner conical ring 2 is provided.
8, one or more sheets (in this example, 2 sheets)
2) partition walls 31 are provided, and both partition walls 30 and 31 are arranged alternately with each other at a predetermined interval in the vertical direction. Therefore, the high-temperature gas entering the cyclone 4 from the duct 17 comes into contact with the particles filled between the outer conical ring 28 and the inner conical ring 29 five times in total, as shown by the arrow in the figure. After the granules have been sufficiently preheated, they are discharged to the discharge duct 27.

FIG. 4 is a conceptual longitudinal cross-sectional view showing another embodiment of the dual-purpose cyclone type heat exchanger, and the cyclone outer cylinder 4a, inner cylinder 5, outer conical ring 28, and inner conical ring 29 are shown in FIG. It is similar to that. In the case of this embodiment, the inner cylinder 5 is extended further upward than the cyclone outer cylinder 4a, and the outer conical ring 2
8. The inner conical rings 29 are similarly extended and arranged, and the inner cylinder and outer conical ring 2
The partition wall 30 provided between the inner conical ring 29 and the inner conical ring 29 has a conical ring shape whose diameter increases upward, and the partition wall 31 provided within the inner conical ring 29 has a conical shape whose diameter increases downward. By forming the partition walls 30 and 31 in this way, the spill 32 (fine particles carried out from the packed bed of particles by the high temperature gas) generated when high temperature gas passes through the packed bed of particles can be removed from both partition walls 30 and 3.
Since the granules fall downward along the slope of 1 and are discharged together with the granules, there is no risk of any spill remaining in the heat exchanger 4.

Note that the case where the powder is preheated using the dual-purpose cyclone type heat exchanger shown in FIGS. 2 and 3 is the same as the case shown in FIG. 2.

Since the powder preheating device according to the present invention is equipped with the dual-purpose cyclone heat exchanger configured as described above, when preheating the granules, high-temperature gas passes through the packed bed of the granules multiple times. Therefore, an extremely high heat exchange rate can be obtained and the granules can be sufficiently preheated.

In addition, in order to increase the number of passages of the high-temperature gas, it is sufficient to increase the number of partition walls, and therefore, if necessary, the arrangement of the inner cylinder, outer conical ring, and inner conical ring may be extended upward as shown in Fig. 4. Good. Furthermore, this device can also be used as a device for preheating granules such as dolomite and ortholime.

[Brief explanation of the drawing]

FIGS. 1 and 2 are conceptual diagrams showing a powder preheating device equipped with a dual-purpose cyclone heat exchanger, and FIGS. 3 and 4 are examples of the dual-purpose cyclone heat exchanger according to the present invention, respectively. FIG. 4... Dual-purpose cyclone type heat exchanger, 4a... Cyclone outer cylinder, 5... Inner cylinder, 28... Outer conical ring, 29... Inner conical ring, 30, 3
1... Bulkhead.

Claims (1)

[Claims] 1. At least one cyclone heat exchanger of the suspension type preheating device is configured as a cyclone type heat exchanger for powder and granular materials so as to function as a granule heat exchanger and a suspension type powder heat exchanger. In the powder and granular material preheating device, the dual-purpose cyclone type heat exchanger has an inner cylinder with an open bottom surface inside the cyclone outer cylinder, and an outer conical ring whose diameter increases upward in the inner cylinder and is vertically arranged in a predetermined manner. A plurality of inner conical rings are arranged at intervals, and within the outer conical ring, a plurality of inner conical rings whose diameter increases downward are arranged at predetermined intervals in the vertical direction, and further provided between the inner cylinder and the outer conical ring. 1. A powder preheating device characterized in that the heat exchanger is made up of partition walls provided in an inner conical ring and partition walls provided in an inner conical ring, which are arranged alternately in the vertical direction.