JP2002028525A - Fine grinding installation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine grinding installation which is capable of easily lowering the temperature of a gas and a ground material to be discharged from a fine grinding machine. SOLUTION: This fine grinding installation comprises a raw material adding means 7 for adding a material to be ground which is branched and connected to the installation, a gas supply passage 3 for supplying a gas, a fine grinder 1 which mechanically fine-grinds the material to be ground to be supplied together with the gas from the gas supply passage 3 while using an air current to convey the material, a gas exhaust path 8 for exhausting the gas to be discharged from the fine grinder 1 together with the ground material through separating means 10 and 11 and a blower 9 and a liquid/solid supply device 12 which is attached to the fine grinder 1 or is branched and connected to the gas supply passage 3 and supplies a vaporizable liquid or a liquefiable or a sublimable solid into a system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an object to be ground (raw material)
Crushing equipment that mechanically pulverizes while pneumatically transporting, and in particular, has been improved to reduce the temperature (absolute value) of the gas and crushed material (product) discharged together from the crusher. Related to fine grinding equipment.

[0002]

2. Description of the Related Art As a fine pulverizing equipment, a raw material mixing means for mixing a material to be ground is branched and connected, and an air supply passage for supplying gas and an air flow for supplying the material to be ground together with the gas from the air supply passage are provided. A pulverizer for mechanically pulverizing (impacting, colliding, and grinding) while transporting, and an exhaust path for discharging gas discharged from the pulverizer together with the pulverized material through a separation means and a blower are provided. An open circuit type, and a fine pulverizer that mechanically pulverizes the material to be pulverized while conveying the material to be pulverized, and a gas discharged from the fine pulverizer together with the pulverized material to the fine pulverizer through a separation means and a blower A gas circulation path for circulating supply, a branching means is sequentially connected between a blower and a fine pulverizer in the gas circulation path in order, and an exhaust means for discharging a part of the circulating gas, an air supply means for supplying gas, and a material to be pulverized. Of a closed circuit type equipped with It is roughly divided into the door.

[0003] Conventionally, in the pulverizing equipment, the following measures have been taken in order to lower the temperature of the gas and the pulverized material discharged together from the pulverizing machine. A gas cooling device is provided upstream of the pulverizer to lower the temperature of the gas supplied to the pulverizer and relatively lower the temperature of the gas and pulverized material discharged from the pulverizer. The amount of gas supplied to the pulverizer is increased, and the temperature of discharged gas and pulverized material is reduced. A cooling jacket is attached to the pulverizer, and the temperature of the exhaust gas and the pulverized material is reduced by heat exchange with a refrigerant. The temperature of the exhaust gas and the temperature of the pulverized material are reduced by reducing the supply amount of the pulverized material and reducing the power of the pulverizer (reducing the amount of heat generated during the pulverization).

[0004]

However, in the conventional pulverizing equipment, in order to treat a substance which is weak to heat or a substance having a low melting point (or a low glass transition point), or to pulverize more finely, the above-mentioned method is used. Although it is necessary to further advance the function of the means of ~, when lowering the supply air temperature,
In particular, the lower the temperature, the lower the energy efficiency of the cooling device, and the initial cost and running cost increase significantly. When the air supply amount is increased, the pulverizing performance is reduced due to a decrease in the residence time of the material to be pulverized in the fine pulverizer. In addition, the initial cost and the running cost are increased due to an increase in pressure loss of the device due to an increase in the gas passage speed and an increase in the size of the device in accordance with a high flow rate. Also, in the case of the cooling enhancement, the initial cost and the running cost are greatly increased as in the case of the above. Further, when the supply amount of the object to be ground is reduced, there is a disadvantage that the ratio of the initial cost and the running cost to the processing amount is extremely increased.

[0005] In view of the above, according to the present invention, the gas is discharged from the pulverizer without enhancing the functions of the gas cooling device and the cooling jacket, and without changing the supply amount and the supply amount of the material to be ground. It is an object of the present invention to provide a fine pulverizing equipment capable of easily reducing the temperature of a gas and a pulverized material.

[0006]

According to a first aspect of the present invention, there is provided a first fine pulverizing apparatus, wherein a raw material mixing means for mixing a material to be ground is branched and connected, and an air supply path for supplying a gas is provided. A pulverizer that mechanically pulverizes the material to be pulverized supplied together with the gas from the air supply path while pneumatically conveying the gas, and a gas discharged from the pulverizer together with the pulverized material is separated through a separation unit and a blower. An exhaust path for discharging, and a liquid / solid supply device attached to the pulverizer or branched and connected to an air supply path to supply a vaporizable liquid or a liquefiable or sublimable solid into the system. I do. The second pulverizing equipment is the first
A measuring instrument for measuring the temperature, pressure and humidity of the gas at the position where the temperature of the gas in the exhaust passage is the lowest, and inputting the measured values of the measuring instrument, and a liquid for preventing dew condensation in the system. A supply amount control device for controlling the supply amount of the solid supply device; The third pulverizing equipment is the first or second pulverizing equipment, which is interposed upstream of the raw material mixing means in the air supply path to cool the supply gas,
A gas cooling / dehumidifying device for dehumidifying is provided.

The fourth pulverizing equipment is a pulverizer for mechanically pulverizing an object to be pulverized while air-flowing, and a gas discharged from the pulverizer together with the pulverized material through a separating means and a blower. A gas circulation path for circulating and supplying the fine pulverizer, a branching means is connected between the blower and the fine pulverizer in the gas circulation path in order, and an exhaust means for discharging a part of the circulating gas, an air supply means for supplying gas, and A raw material mixing means for mixing the material to be crushed, and a solid supply device attached to the fine crusher or branched and connected between the air supply means and the fine crusher in the gas circulation path to supply the subliming solid into the system; It is characterized by having. Further, the fifth pulverizing equipment is characterized in that, in the fourth apparatus, a gas cooling device is provided between the air supply means and the raw material mixing means in the gas circulation path and cools the gas. .

[0008] In the first pulverizing equipment, heat generated from the pulverizer is consumed as a small amount of liquid is vaporized or vaporized or sublimated through liquefaction of solid. In the second pulverizing equipment, in addition to having the same action as the first one,
Condensation in the system is prevented. In the third pulverizing facility, the same action as that of the first or second one is obtained, and the temperature and humidity of the supplied gas are reduced. In the fourth pulverizing facility, heat generated from the pulverizer is consumed with sublimation of a small amount of solid, and the circulating gas in the system is gradually replaced with sublimated gas. In the fifth pulverizing equipment,
In addition to having the same effect as the fourth one, the temperature of the circulating gas decreases.

Water or alcohol is used as the vaporizable liquid, ice is used as the liquefiable solid, and dry ice is used as the sublimable solid. The supply of the liquid or solid into the system may be performed by either a pulverizer or an air supply path.However, when the liquid is supplied through an air supply path, there is no heat generation at the supply point, and the liquid is not vaporized immediately. Since the air path and the inner surface of the inlet casing of the pulverizer are wet and there is a concern that the material to be pulverized adheres, it is preferable to supply the pulverizer with the pulverizer.
Further, when the solid is supplied by a fine pulverizer, it is necessary to make the solid very fine (about 1 mm) before the supply. Therefore, it is preferable to supply the solid through an air supply path that can supply the solid even if it is relatively large (about 10 mm). When the liquid or solid is supplied into the system by a fine pulverizer, a plurality of supply ports are provided in the pulverizing chamber, and the temperature distribution in the pulverizing chamber (usually, the outlet side is higher than the inlet side) is taken into consideration. Increase the number of supply ports on the outlet side from the inlet side, or increase the supply port on the outlet side from the inlet side, or adjust the supply amount by controlling the supply devices on the inlet side and the outlet side individually Is preferred.

As a separating means for separating the pulverized material and the gas, a cyclone and a bag filter are used. In addition,
A classifier may be interposed before the separation means downstream of the pulverizer, and the coarse particles may be returned after the raw material mixing means upstream of the pulverizer.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a first embodiment of the fine pulverizing equipment according to the present invention. In the figure, reference numeral 1 denotes a mechanical device which is mechanically affected by heat, such as a toner, a powder coating material, a resin, etc., which is subjected to impact, collision and attrition while air-flowing a material to be ground (raw material) having a weak or low melting point (or a low glass transition point). This fine pulverizer 1 is a fine pulverizer
Although not shown, for example, a crushing chamber is formed by a rotor that rotates at a high speed by a rotating shaft driven via a motor 2 and a cylindrical stator that is fitted to the rotor with a small gap and that is closed at both ends. At the same time, one end of the pulverizing chamber has a supply port 1a for the pulverized material and air, and the other end has a discharge port 1 for pulverized material and air.
b, and a cooling jacket for removing heat generated at the time of grinding at the outer periphery of the grinding chamber.

The supply port 1a of the pulverizer 1 is connected to one end of an air supply passage 3 for sucking air by a blower described later and supplying the air to the pulverizing chamber of the pulverizer 1 as a carrier gas. A gas cooling / dehumidifying device 4 for cooling and dehumidifying supply air is connected to the other end of the air supply passage 3. And
The gas cooling / dehumidifying device 4 and the cooling jacket of the pulverizer 1 are chilled (cooled) so as to perform their respective cooling functions.
The unit 5 is connected in series via the refrigerant passages 6a, 6b, 6c. A feeder 7a, a mixing device 7b are provided between the gas cooling / dehumidifying device 4 and the pulverizer 1 in the air supply passage 3.
The mixing means 7 for mixing the material to be ground into the air flowing in the air supply path 3 is branched and connected via the mixing path 7c.

On the other hand, one end of an exhaust path 8 for discharging air discharged together with the pulverized material from the pulverizer 1 is connected to an outlet 1b of the pulverizer 1. At the end, a blower 9 for sending air into the atmosphere is connected. In the exhaust passage 8, a cyclone 10 and a bag filter 11 are interposed in order from the upstream as a separating means for separating the pulverized material and the air.

The pulverizer 1 has a liquid supply device 12 for supplying a vaporizable liquid such as water or alcohol into the pulverization chamber.
Is attached. The liquid supply device 12 consumes heat generated by the pulverization operation by evaporating the liquid, suppresses the temperature of the air discharged from the pulverizer 1 and the temperature of the pulverized material, and supplies the liquid to the pulverization chamber. , A plurality of spray nozzles 12a arranged in the crushing chamber. The number or spray amount of the spray nozzles 12a is provided so as to be adjustable in consideration of the temperature distribution in the crushing chamber so as to increase the number or spray amount on the outlet side where the temperature becomes high. The liquid supply amount of the liquid supply device 12 is measured at the position where the temperature of the air in the exhaust path 8 is the lowest, that is, the temperature, pressure, and humidity of the air flowing between the bag filter 11 and the blower 9. It is controlled by a supply amount control device 15 that controls so that dew condensation does not occur in the system based on a measurement value input from the device 13 via a signal line 14. In FIG. 1, reference numeral 16 denotes a flow control valve interposed between the bag filter 11 and the measuring device 13 in the exhaust path 8.

In the fine pulverizing equipment having the above-mentioned structure, the blower 9
Is cooled and dehumidified by the gas cooling / dehumidifying device 4 and then the material to be crushed is mixed by the operation of the raw material mixing means 7 and the air is sucked into the supply port 1 a or the fine crusher 1. Into the grinding chamber. The material to be pulverized by the airflow is finely pulverized by being hit, collided and crushed by the rotor and the stator, and then sent to the exhaust path 8 from the discharge port 1b together with the air. As a result, the pulverized material and the air are separated, the pulverized material is discharged as a product from the discharge path 10a, and the air is sent to the bag filter 11 together with the remaining pulverized material. Next, the residual crushed material and the air are separated by the bag filter 11, the residual crushed material is discharged from the discharge path 11a, and the air is discharged from the blower 9 to the atmosphere. The heat generated by the pulverizing operation in the pulverizing chamber of the fine pulverizer 1 is consumed as a small amount of liquid supplied to the pulverizing chamber by the liquid supply device 12 is vaporized.
The temperature of the gas discharged from the pulverizer 1 and the temperature of the pulverized material can be reduced. Further, since the supply amount of the liquid from the liquid supply device 12 is controlled by the supply amount control device 15 and adjusted in consideration of the temperature distribution in the crushing chamber, no dew condensation occurs in the system, and The temperature distribution in the grinding chamber can be kept substantially uniform.

FIG. 2 is a schematic configuration diagram showing a second embodiment of the pulverizing equipment according to the present invention. This fine grinding equipment
A classifier 17 is provided between the fine crusher 1 and the cyclone 10 in the exhaust path 8 to classify the crushed material discharged together with the air from the fine crusher 1 into coarse particles and fine particles. The coarse particles thus returned are returned between the raw material mixing means 7 and the fine pulverizer 1 in the air supply path 3 via the return path 18 and are then finely pulverized again. ,
It is possible to increase the crushing efficiency. Other configurations and operational effects are almost the same as those of the first embodiment. Therefore, the same constituent members and the like are denoted by the same reference numerals and description thereof is omitted.

FIG. 3 is a schematic configuration diagram showing a third embodiment of the pulverizing equipment according to the present invention. This fine grinding equipment
In the first embodiment described above, the vaporizable liquid is supplied to the pulverizing chamber of the fine pulverizer 1 by the liquid supply device 12, whereas a solid that can be vaporized through liquefaction of ice or the like is used. A device configured to supply from a solid supply device 19 that supplies a sublimable solid such as dry ice or camphor to a space between the raw material mixing means 7 and the pulverizer 1 in an air supply passage 3 through an introduction passage 19a. It is. The other configuration is the first except that the gas cooling / dehumidifying device 4 is replaced with a gas cooling device 4 ′ for cooling the sucked air and that the measuring device 13 and the supply control device 15 are not provided. Since the configuration is the same as that of the embodiment, the same components and the like are denoted by the same reference numerals, and description thereof will be omitted.

In the pulverizing equipment having the above-mentioned structure, the pulverizing process of the material to be pulverized is performed in substantially the same manner as in the first embodiment, and the heat generated by the pulverizing operation in the pulverizing chamber of the pulverizer 1 is Since the solids are consumed by vaporization or sublimation through liquefaction of a small amount of solid supplied from the air supply passage 3 to the grinding chamber via the supply port 1a by the solid supply device 19, the same as that of the first embodiment In addition, the temperature of the gas discharged from the pulverizer 1 and the temperature of the pulverized material can be reduced.

In the above-described embodiment, the case where the solid is supplied to the air supply path has been described. However, the present invention is not limited to this, and the solid may be supplied to the pulverizing chamber of the pulverizer 1. When the solid is ice, as in the first embodiment, a measuring instrument for measuring the temperature, pressure and humidity of the air is provided at a position where the temperature of the air is the lowest in the exhaust passage 8, and A supply amount control device for controlling the supply amount of the solid supply device 19 based on the measurement value of the measuring device so that dew condensation does not occur in the system may be provided. Further, the exhaust passage 8
As in the second embodiment, a classifier may be interposed between the fine pulverizer 1 and the cyclone 10 to return coarse particles to the air supply passage 3.

FIG. 4 is a schematic configuration diagram showing a fourth embodiment of the fine pulverizing equipment according to the present invention. In the figure, reference numeral 21 denotes a fine pulverizer similar to that of the first embodiment.
Although not shown, for example, crushing is performed by a rotor that is rotated at a high speed by a rotating shaft driven via a motor 22 and a cylindrical stator that is fitted to the rotor with a small gap and that is closed at both ends. A chamber is formed, and a supply port 21a for the material to be crushed and air is provided at one end of the crushing chamber, and a discharge port 21b for the crushed material and air is provided at the other end, and heat generated at the time of crushing on the outer periphery of the crushing chamber is removed. And a cooling jacket.

The discharge port 21b and the supply port 21 of the pulverizer 21
a is connected by a gas circulation path 23 that circulates and supplies air discharged together with the pulverized material as carrier air.
In the gas circulation path 23, a cyclone 24 as separation means for separating pulverized material and air from the discharge port 21b side,
A bag filter 25 as separation means for separating residual pulverized matter and air, a blower 26 for sending out circulating air, and a gas cooling device 27 for cooling circulating air are provided. or,
In the gas circulation passage 23, a part of the circulating air (for example,
Vent fan 2 as exhaust means for exhausting about 1/4)
8 and an intake passage 29 as an air supply means for sucking and supplying outside air corresponding to the exhaust air from the vent fan 28,
6 and a branch connection between the blower 26 and the gas cooling device 27 in order from the side.
b and the mixing path 30c.
The raw material mixing means 30 that mixes with the air flowing through the inside 3 and the solid supply device 31 that supplies sublimable solids such as dry ice and camphor are sequentially connected to the gas cooling device 27 and the pulverizer 21 from the gas cooling device 27 side. Between each mixing path 30
c, and are branched and connected via the introduction path 31c.

The gas cooling device 27 and the cooling jacket of the pulverizer 21 are provided with a chiller (cooling) unit 32 and refrigerant passages 33a, 33b, 3 so as to perform respective cooling functions.
3c are connected in series. In FIG. 4, reference numeral 34 denotes the bag filter 25 and the blower 26 in the gas circulation path 23.
And a flow control valve interposed between the two.

In the above-described embodiment, the case where the solid is supplied between the raw material mixing means 30 and the fine pulverizer 21 in the gas circulation path 23 has been described. May be supplied to the grinding chamber. Further, a classifier is interposed between the pulverizer 21 and the cyclone 24 in the gas circulation path 23 in the same manner as in the second embodiment, and the coarse particles are mixed with the raw material mixing means 30 in the gas circulation path 23. It may be returned between the crusher and the crusher 21.

In the fine pulverizing apparatus having the above-mentioned structure, the blower 2
The air sucked into the gas circulation passage 23 from the intake passage 29 by the operation of the cooling device 6 is cooled by the gas cooling device 27, and the material to be ground is mixed by the operation of the raw material mixing means 30, and the air is pulverized from the supply port 21 a. 21 into the grinding chamber. After being pulverized, the material to be pulverized by the airflow is finely pulverized by impact, collision and grinding action by the rotor and the stator.
The pulverized material is supplied from the discharge port 21b to the gas circulation path 23 together with the air. The pulverized substance and the air are separated by the cyclone 24, and the pulverized substance is discharged as a product from the discharge path 24a. Is sent to the bag filter 25. Next, the residual pulverized matter and air are separated by the bag filter 25, the residual pulverized matter is discharged from the discharge passage 25a, the air reaches the vent fan 28 through the blower 26, and a part of the air is discharged to the atmosphere, and The remainder is combined with the air sucked in from the intake passage 29 and the gas cooling device 2
After being cooled by 7, it is returned to the fine pulverizer 21.
The heat generated by the pulverizing operation in the pulverizing chamber of the pulverizer 21 is consumed by sublimation of a small amount of solid supplied to the pulverizing chamber from the solid supply device 31 via the gas circulation path 23. The temperature of the pulverized material of the air (including the gas by sublimation) discharged from the air can be lowered.
In addition, since the circulating gas in the system is gradually replaced by the gas generated by sublimation of the solid, the influence of moisture due to outside air can be reduced, and an inert gas such as nitrogen gas is replaced with outside air. When used, its consumption can be reduced.

In each of the above embodiments,
As the fine pulverizer for finely pulverizing the object to be pulverized while being transported by air flow, a case in which a pulverizing chamber is formed by a rotor and a stator has been described. However, the present invention is not limited to this. A roller mill, or a fine pulverizer that mechanically pulverizes an object to be pulverized while carrying it in an air stream may be used. The gas is not limited to the case where air is used, but may be an inert gas such as a nitrogen gas or the like for exposure prevention.

[0026]

As described above, according to the first fine pulverizing equipment of the present invention, the heat generated from the fine pulverizer is converted into vaporization or sublimation through vaporization of a small amount of liquid or liquefaction of a small amount of solid. As it is consumed along with it, the conventional pulverizer can be used without enhancing the functions of the gas cooling device and cooling jacket, or changing the supply amount and the supply amount of the material to be crushed. The temperature of the discharged gas and the crushed material can be easily reduced, and the initial cost and running cost can be greatly reduced. According to the second pulverizing equipment, the same operation and effect as those of the first one can be obtained, and dew condensation in the system is prevented, so that a smooth operation can be performed. According to the third pulverizing facility, the same operation and effect as those of the first and second units can be obtained, and the temperature and humidity of the supplied gas are reduced, so that the above-mentioned operation and effect can be further enhanced. According to the fourth pulverizing equipment, since the heat generated from the pulverizer is consumed with the sublimation of a minute amount of solid, the same operation and effect as the first one can be obtained. Since the circulating gas inside is gradually replaced by sublimated gas, the influence of moisture due to outside air can be reduced, and when an inert gas such as nitrogen gas is used instead of outside air, the amount of consumption Can be reduced. or,
According to the fifth pulverizing facility, the same operation and effect as those of the fourth embodiment can be obtained, and the temperature of the circulating gas is reduced, so that the above-mentioned operation and effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a pulverizing facility according to the present invention.

FIG. 2 is a schematic configuration diagram showing a second embodiment of the pulverizing equipment according to the present invention.

FIG. 3 is a schematic configuration diagram showing a third embodiment of the fine pulverizing equipment according to the present invention.

FIG. 4 is a schematic configuration diagram showing a fourth embodiment of the fine pulverizing equipment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fine crusher 3 Supply path 4 Gas cooling / dehumidifying device 7 Raw material mixing means 8 Exhaust path 9 Blower 10 Cyclone (separating means) 11 Bag filter (separating means) 12 Liquid supply device 13 Measuring device 15 Supply control device 19 Solid Supply device 21 Fine pulverizer 23 Gas circulation path 24 Cyclone (separation means) 25 Bag filter (separation means) 26 Blower 27 Gas cooling device 28 Vent fan (Exhaust means) 29 Intake path (Air supply means) 30 Raw material mixing means 31 Solid Supply device

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masayuki Motoyoshi 1780 Kamikono, Yachiyo-shi, Chiba Kawasaki Heavy Industries, Ltd. F term in Yachiyo factory (reference) 4D052 AA00 BA03 4D067 EE07 EE13 EE22 EE47 FF04 FF16 GB05

Claims (5)

[Claims] 1. A raw material mixing means for mixing a material to be crushed is branched and connected, and an air supply passage for supplying a gas and a material to be crushed supplied together with the gas from the air supply passage are mechanically transported by air flow. A fine pulverizer for fine pulverization, an exhaust path for discharging gas discharged from the fine pulverizer together with the pulverized material through a separation means and a blower, and a branch connected to the fine pulverizer or an air supply path,
A pulverizing facility comprising: a liquid / solid supply device for supplying a vaporizable liquid or a liquefiable or sublimable solid into a system. 2. A measuring instrument for measuring the temperature, pressure and humidity of the gas at the position where the temperature of the gas in the exhaust passage is the lowest, and a measurement value of the measuring instrument is inputted so that dew condensation does not occur in the system. The pulverizing equipment according to claim 1, further comprising a supply amount control device that controls a supply amount of the liquid / solid supply device. 3. The pulverizing equipment according to claim 1, further comprising a gas cooling / dehumidifying device interposed upstream of the raw material mixing means in the air supply path to cool and dehumidify the supplied gas. 4. A pulverizer for mechanically pulverizing an object to be pulverized while air-flowing the same, and a gas discharged from the pulverizer together with the pulverized material is circulated and supplied to the pulverizer via a separation means and a blower. And a gas circulating passage, and a blower and a fine pulverizer in the gas circulating passage, each of which is branched and connected in order, and an exhaust unit for discharging a part of the circulating gas, a gas supplying unit for supplying the gas, and a material to be crushed are mixed. Material mixing means, and a solid supply device attached to the pulverizer or branched between the air supply means and the pulverizer in the gas circulation path and supplying solid to be sublimated into the system, Fine grinding equipment. 5. The pulverizing equipment according to claim 4, further comprising a gas cooling device interposed between the air supply means and the raw material mixing means in the gas circulation path to cool the gas.