JP2729784B2 - Fine grinding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine pulverizing apparatus for finely pulverizing a material to be pulverized while carrying it in a stream.

[0002]

2. Description of the Related Art Conventionally, as this kind of fine pulverizing equipment, one for a material to be pulverized which is easily affected by heat described in JP-A-63-104663 is known. As shown in FIG. 2, the pulverizing equipment includes a material (raw material) and air supply port 31, a pulverized product and air discharge port 32, and a pulverizing chamber 3 as shown in FIG.
A fine pulverizer 35 having a cooling jacket 34 provided on the outer periphery of the pulverized product 3 and a classifier 3
6. The separator 37, the blower 38, the air cooler 39 and the material mixing device 40 are circulated and supplied to the pulverizer 35 in order, and a vent fan is branched and connected between the blower 38 and the air cooler 39. A cooling medium (brine) is supplied to an air circulation path 41 in which an intake path (both not shown) is branched and connected between the fan and the air cooler, a first heat exchange section 42 of the air cooler 39 and a cooling jacket 34. A first refrigerant circulation path 44 for circulating and supplying via a refrigerant tank 43;
A second refrigerant circulation path 47 for circulating and supplying a cooling medium (water) to the second heat exchange section 45 of the air cooler 39 through the cooling tower 46 is schematically configured. In FIG. 2, reference numeral 48 denotes a feeder for supplying a raw material to the material mixing device 40; 49, a feeder for supplying coarse particles returned from the classifier 36 via the return path 50 to the material mixing device 40; 1. A pump inserted in the second refrigerant circulation paths 44, 47. Numeral 53 denotes a refrigerator, a first cooling path 55 for circulating and cooling the cooling medium in the refrigerant tank 43 via a pump 54, and a second cooling circuit 4
A second cooling path 56 is provided to cool the refrigerator 53 by bypassing a part of the cooling medium inside and behind the air cooler 39.

In the above-mentioned pulverizing equipment, the material to be pulverized by the blower 38 from the feeder 48 to the pulverizer 35 via the material mixing device 40, the air circulation path 41 and the supply port 31 is supplied to the pulverizer. After being pulverized by the impact action and the grinding action at 35, it is fed together with the carrier air from the outlet 32 to the air circulation path 41, and is first separated by the classifier 36 into coarse particles, fine particles, and air. The coarse particles are supplied again to the material mixing device 40 via the return path 50 and the feeder 49, and the fine particles are sent to the separator 37 together with the conveying air to be separated into fine particles (product) and air. Next, the air reaches the vent fan via the blower 38, a part of the air is exhausted, and enters the air cooler 39 together with the air sucked from the intake passage, and the air is cooled by the second and first heat exchangers 45 and 42. After being cooled by heat exchange and dehumidified so that the relative humidity at that temperature becomes about 100%, the material mixing device 4
Refluxed to zero. On the other hand, pump 51
The cooling medium supplied to the first heat exchange section 42 of the air cooler 39 after cooling the air is supplied to the cooling jacket 34 to remove the heat generated due to the pulverization, and then removes the refrigerant from the refrigerant tank 43. Refluxed. On the other hand, the cooling medium sent from the cooling tower 46 to the second heat exchange unit 45 of the air cooler 39 by the pump 52 cools the air, and then returns to the cooling tower 46. The cooling medium stored in the refrigerant tank 43 is circulated to the refrigerator 53 by the pump 54 and cooled, and the cooling medium stored in the cooling tower medium 46 is bypassed before and after the air cooler 39. A part is circulated to the refrigerator 53 and used for cooling the refrigerator 53.

[0004]

In the conventional pulverizing equipment, the air cooled through the air cooler has a relative humidity of about 10%.
Since it contains 0% steam,
Although the calorific value of the pulverizer exceeds the cooling capacity of the jacket and does not cause condensation, etc., the cooling jacket is cooled when the raw material is not supplied or when the operation of the pulverizer is stopped. The capacity exceeds the calorific value of the pulverizer, and the temperature of the transport air drops below the cooling temperature of the air cooler, which may cause dew condensation or freezing inside the pulverizer, piping, classifier, and the like. When water vapor in the transport air is condensed, dew condensation water accumulates in a portion where the air flow is slow, such as a fine pulverizer, a classifier, or a cyclone, or the bag filter becomes clogged with moisture and becomes inoperable. This tendency is to improve the cooling capacity of the cooling jacket in order to increase the throughput (the temperature of the cooling medium is set to about -10 ° C).
In this case, the cooling temperature is set to about 0 ° C., and it is difficult to increase the throughput. Therefore, an object of the present invention is to provide a fine pulverizing equipment capable of improving the cooling capacity and enabling a dramatic increase in the throughput at energy saving and at low cost.

[0005]

In order to solve the above-mentioned problems, a fine-pulverizing apparatus according to the present invention has a cooling pulverization provided on the outer periphery of a pulverizing chamber for pulverizing a material to be pulverized while air-flowing it. The air discharged together with the mill and the pulverized product is circulated and supplied to the pulverizer through the separation means, the blower, the air cooler, and the material mixing device in order, and a part of the circulating air is discharged between the blower and the air cooler. An air circulation path in which an exhaust means is branched and connected, and an intake path is branched and connected between the exhaust means and the air cooler; and a refrigerant for circulating and supplying a cooling medium to the cooling jacket and the air cooler through a refrigerant tank. In a pulverizing facility provided with a circulation path, a dehumidifier is interposed in the intake path.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing an example of an embodiment of the pulverizing equipment of the present invention. In the figure, reference numeral 1 denotes a fine pulverizer for finely pulverizing materials (raw materials) such as toners, powder coatings, and resins which are easily affected by heat while air-flowing the materials.
Although not shown, the pulverizer 1 forms a pulverizing chamber by a rotor that rotates at a high speed by a rotating shaft and a cylindrical stator that is fitted to the rotor with a small gap, and a pulverizing chamber is formed. One end is provided with a supply port 2 for the material to be crushed and air, and the other end is provided with an outlet 3 for the crushed product and air, and a cooling jacket 4 for removing heat generated during crushing is provided on the outer periphery of the crushing chamber. ing. The discharge port 3 and the supply port 2 of the pulverizer 1 are connected by an air circulation path 5 that circulates and supplies air discharged together with the pulverized product as carrier air. In the air circulation path 5, a classifier 6 for separating coarse and fine particles, fine powder and air, which is a separating means for separating the pulverized product and air, in order from the discharge port 3 side, fine and fine powder and air 7, a bag filter 8 for separating residual fine powder and air, a blower 9 for blowing circulating air, an air cooler 10 for cooling circulating air, and a raw material supplied from a feeder 11 mixed into the conveying air. The material mixing device 12 is inserted. Further, in the air circulation path 5, a vent fan 13 as an exhaust means for exhausting a part (for example, about 1/4) of the circulating air is provided in order to perform a stable operation by suppressing a pressure fluctuation inside the circulation system. A branch connection is made between the blower 9 and the air cooler 10, and an intake passage 14 for sucking outside air corresponding to the exhaust by the vent fan 13 is branched and connected between the vent fan 13 and the air cooler 10. I have. And
A dehumidifier 15 for removing the water vapor of the intake air is interposed in the intake passage 14, and a pre-air cooler 16 for cooling the intake air is inserted upstream of the dehumidifier 15. I have.

On the other hand, the cooling jacket 4 is
The air cooler 10 and the pre-air cooler 16 are connected to a refrigerant tank 19 by a first refrigerant circuit 18 interposed therebetween, and a second refrigerant circuit 21 interposed by a pump 20
The air cooler 10 is connected in series with the refrigerant tank 19 on the upstream side, and the coolant such as brine stored in the refrigerant tank 19 can be circulated and supplied for each path by the operation of the pumps 17 and 20. Is provided. The refrigerant tank 19 is connected to the refrigerator 24 by a refrigerant cooling circuit 23 interposed with a pump 22, and is provided so that the cooling medium accommodated in the refrigerant tank 19 can be cooled.

In FIG. 1, 25 is a double damper 2
The coarse particles separated by the classifier 6 are fed to the return feeder 27 through a return path interposed therebetween, and the coarse particles contained in the return feeder 27 are conveyed by the material mixing device 12 together with the raw material by the material mixing device 12. It is mixed in.
28 is a product discharge path interposed with a double damper 29,
The fine powder and fine powder separated by the cyclone 7 are discharged as a product, and reference numeral 8a denotes a fine powder discharge path interposed with a damper 8b. Further, reference numerals 21a, 21b, and 21c denote first, second, and third bypasses provided in the second refrigerant circulation path 21, respectively. The first, second, and third flow rates interposed in the second refrigerant circuit 21 on the upstream side of the pump 20, downstream of the air cooler 10, and downstream of the pre-air cooler 16. Control valves 30a, 3
0b and 30c are provided so as to be adjustable.

[0010] In the fine pulverizing equipment of the above configuration, the blower 9
And the operation of the vent fan 13, the feeder 11 and the return feeder 27 to the material mixing device 12, the air circulation path 5, and the like.
The material to be pulverized which has been pneumatically conveyed to the pulverizing chamber of the pulverizer 1 through the supply port 2 is subjected to a striking action and a grinding action by the rotor and the stator, and is pulverized. Is supplied to the air circulation path 5 and is first separated by the classifier 6 into coarse particles and fine particles, fine powder and air. The coarse particles are supplied to the return feeder 27 through the return path 25 and the double damper 26, and , Fines, fines and air are fed to the cyclone. Next, fine particles and fine powder and air are separated by the cyclone 7, the fine particles and fine powder are discharged from the discharge path 28, and the remaining fine powder and air are sent to the bag filter 8 to be separated into fine powder and air. The fine powder is discharged from the fine powder discharge passage 8a. Then, the air reaches the vent fan 13 through the blower 9, a part of the air is discharged, and is cooled by the pre-air cooler 16 and dehumidified by the dehumidifier 15 together with the air sucked from the intake passage 14. After being further cooled by the air cooler 10, it is returned to the material mixing device 40. The above vent fan 1
The air sucked from the intake passage 14 along with the exhaust of a part of the circulating air by the air cooler 3 is cooled by the pre-air cooler 16 and then dehumidified by the dehumidifier 15, so that the air is dehumidified with high efficiency and the absolute humidity is reduced. And the air in the air circulation path 5 is replaced with dehumidified air. Therefore, it is possible to lower the temperature of the cooling medium for air cooling and to lower the cooling temperature of the air in the air cooler 10 to 0 ° C. or lower. No freezing or freezing occurs, and the throughput can be dramatically increased. On the other hand, the cooling medium sent from the refrigerant tank 19 to the cooling jacket 4 by the pump 17 is supplied to the pulverizer 1.
The cooling medium returned to the refrigerant tank 19 after removing the heat generated along with the cooling medium, and sent from the refrigerant tank 19 to the air cooler 10 and the pre-air cooler 16 by the pump 20 in order are circulating air and intake air. Is cooled and returned to the refrigerant tank 19 in the same manner. On the other hand, the cooling medium sent from the refrigerant tank 19 to the refrigerator 24 by the pump 22 is cooled and returned to the refrigerant tank 19. The circulating air and / or the pre-air cooler 16 by the air cooler 10
If it is necessary to adjust the cooling temperature of the intake air by the first, second or third bypass 21a, 21
The flow rates of b and 21c are appropriately adjusted to adjust the amount of the cooling medium flowing into and out of the refrigerant tank 19, the air cooler 10, or the pre-air cooler 16. At the time of cooling by the cooling jacket 4, the air cooler 10, and the pre-air cooler 16, the cooling medium is individually supplied to the cooling jacket 4 and each of the air coolers 10, 16. , And can be cooled individually.

In the above embodiment, as a fine pulverizer for finely pulverizing a material to be pulverized while air-flowing it, a pulverization chamber formed by a rotor and a stator and a cooling jacket provided on the outer periphery thereof is provided. Although the case where it is used has been described, the present invention is not limited to this, and a horizontal axis type pin mill having a cooling jacket or another pulverizer may be used. Further, the invention is not limited to the case where a classifier, a cyclone and a bag filter are sequentially inserted between the pulverizer and the blower in the air circulation path.
The cyclone and the bag filter may be inserted in order, or only the bag filter may be inserted, without using the classifier. Further, the refrigerant circuit may be a single refrigerant circuit in which the first and the second are connected in series without dividing the refrigerant circuit into the first and second two, and the refrigerant circuit may take various forms. is there.

[0012]

As described above, according to the first pulverizing equipment of the present invention, since the air in the air circulation path is replaced by dehumidified air having a low absolute humidity, the air temperature is reduced to 0 ° C. or less. Also, even if the cooling capacity is increased by lowering the temperature of the cooling medium used for the cooling jacket, dew condensation and freezing do not occur, and the throughput can be dramatically increased, and, consequently, the energy saving of the equipment , Low cost can be achieved.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an example of an embodiment of a pulverizing facility according to the present invention.

FIG. 2 is a system diagram of a conventional fine grinding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pulverizer 4 Cooling jacket 5 Air circulation path 6 Classifier 7 Cyclone 8 Bag filter 9 Blower 10 Air cooler 12 Material mixer 13 Vent fan 14 Intake path 15 Dehumidifier 16 Pre-air cooler 18 First refrigerant circulation Road 19 Refrigerant tank 21 Second refrigerant circulation path

Claims (1)

(57) [Claims] 1. A pulverizer having a cooling jacket provided on an outer periphery of a pulverizing chamber for pulverizing a material to be pulverized while air-flowing the material, a separating means for separating air discharged together with the pulverized product,
A blower, an air cooler, and a material mixing device are sequentially circulated and supplied to the pulverizer, and exhaust means for partially discharging circulating air is branched and connected between the blower and the air cooler. An air circulation path in which an intake path is branched and connected between coolers; and a refrigerant circulating path for circulating a cooling medium to the cooling jacket and the air cooler through a refrigerant tank. A fine pulverizing equipment characterized in that a dehumidifier is inserted in the equipment.