JP3546840B2 - Filtration and drying equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filtration / drying apparatus capable of continuously performing filtration and drying of a slurry-like substance, and particularly to a filtration / drying apparatus capable of efficiently removing a cake attached to a filter plate. Things.
[0002]
[Prior art]
In a wide range of industrial fields such as foods, chemicals, and pharmaceuticals, various substances are manufactured and produced. In particular, when producing a slurry-like substance, the slurry is filtered in a filter to form a cake, and in many cases, the cake is washed, and after removing impurities, the cake is dried to remove crystals and powder. However, providing separate filtration tanks and dryers for each operation increases the equipment cost. In addition, when the material after the filtration operation is transferred from the filtration tank to the dryer, the loss of the material often occurs during that time, and the operation is troublesome.
[0003]
In particular, when manufacturing expensive chemicals or handling crystals that are easily oxidized by air, performing the filtration work and drying work etc. separately with different apparatuses as described above lowers the quality and yield of the entire product, and sometimes There was a disadvantage that the crystal was destroyed and the quality was lowered.
Therefore, as disclosed in Japanese Patent Publication No. 46-22201, there is provided an apparatus capable of continuously performing filtration and drying operations with one filtration and drying apparatus.
[0004]
The filtration and drying apparatus A shown in Japanese Patent Publication No. 46-22201 has a cylindrical shape at the center and a conical shape at the top and bottom, a filter plate 2 is attached to the lower end in the cylindrical portion, and a filtrate outlet 3 is provided at the center of the bottom. . Further, a lid 9 having a processing liquid charging pipe 10, a product outlet, and a washing water jetting pipe 8 at the center is attached to the opening 1 on the upper surface. The cylindrical body that is rotatably supported by the left and right tubular machine shafts 6 and 7 is surrounded by a jacket 5 to form a double wall, and hot water is supplied into the jacket 5.
[0005]
In order to carry out the filtration operation with the above-mentioned filtration and drying apparatus A, the aqueous solution to be filtered is sent from the treatment liquid charging pipe 10 into the cylindrical unit, the filtration treatment is carried out by the filtration plate 2, and the filtrate is passed through the filtrate discharge port 3 to the outside. To be discharged. After a certain period of time, when a cake layer having a certain thickness is formed on the filter plate 2, the supply of the aqueous solution is stopped, the outlet 3 is closed, and hot water is circulated in the jacket 5 as a heating medium for heating. While rotating the cylindrical portion continuously in a certain direction.
[0006]
When the cylindrical portion is heated and rotated about the tubular machine shafts 6 and 7 while the inside of the cylindrical portion is decompressed, the cake layer formed on the filter plate 2 circulates in the cylindrical portion up and down or in the rotating direction. The cake collides with the inner wall surface of the cylindrical portion, and is gradually dried by the mutual contact of the cake to finally produce a dried product such as a crystal or a granular material. After performing a drying process for a necessary time, the lid 9 is opened with the downward facing, and the dried product is taken out.
[0007]
[Problems to be solved by the invention]
In the above-mentioned conventional filtration / drying device, a cake layer is formed on the filter plate 2 after filtration, and the cake is shaken off from the filter plate 2 by rotating the cylindrical portion continuously in a certain direction, and the cake is dried. Processing is performed.
However, since the liquid remains on the cake after filtration and has stickiness, even when the cylindrical portion is continuously rotated, the thin layer cake in contact with the filter plate 2 remains on the filter plate 2 as it is. It is dried and adheres to the filter plate 2.
After that, when a new stock solution slurry is supplied and filtration and drying operations are continuously performed, another cake is further thinly adhered to the cake adhered to the filter plate 2, and the cake layer gradually becomes thicker. The situation where clogging occurred and sufficient filtration could not be performed occurred.
[0008]
The present invention has been made in view of the above-mentioned problems of the prior art, and prior to drying of the cake, by providing blowback means for supplying a pressure gas such as air from the back side of the filtration surface to the filtration plate, the cake from the filtration plate It is an object of the present invention to provide a filtration / drying device for stripping off.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the apparatus of the present invention covers the outer periphery of a pressurized or depressurized sealed container 3 with a jacket 4 and installs a filter plate 5 below the container 3 to filter the inside of the container 3. The filtration chamber 6 is separated into a chamber 6 and a drying chamber 7, and the filtration chamber 6 is divided into a plurality of chambers 15 by a grid-like support plate 13. The slurry is filtered, the filtrate is discharged from the discharge port 11, and the cake formed on the filter plate 5 is separated from the filtration chamber 6 toward the drying chamber 7 by the pressure gas injected from the discharge port 11, and filtered and dried. The tank 1 is rotated or inverted, and the cake is dried while heating the container 3 to produce a dried product.
[0010]
Further, in the apparatus of the present invention, the outer periphery of the closed type container 3 which can be pressurized or depressurized is covered with a jacket 4, and a filter plate 5 is installed below the container 3, and the inside of the container 3 is provided with a filtration chamber 6 and a drying chamber 7. The filtration chamber 6 is provided with a filtration / drying tank 1 in which a plurality of separate chambers 15 are formed by a grid-like support plate 13, and the filtrate is discharged through a discharge port provided in each of the chambers 15. The cake discharged on the filter plate 5 and formed on the filter plate 5 is peeled off from the filtration chamber 6 toward the drying chamber 7 by the pressurized gas jetted from each discharge port 11, and the filtration / drying tank 1 is rotated or inverted, and The cake is dried while heating 3 to produce a dried product.
[0011]
Further, in the apparatus of the present invention, the outer periphery of the closed or pressurized closed container 3 is covered with a jacket 4, a filter plate 5 is provided below the container 3, and the inside of the container 3 is provided with a filtration chamber 6 and a drying chamber 7. The filtration chamber 6 is divided into a plurality of chambers 15 by a grid-like support plate 13, and each of the divided chambers 15 filters the undiluted slurry by the filtration / drying tank 1, which can be connected by a communication channel 14. The liquid is discharged from the discharge port 11 and the cake formed on the filter plate 5 is separated from the filtration chamber 6 toward the drying chamber 7 by the pressurized gas injected from the discharge port 11, and the inverted container 3 is heated. While the cake is crushed by the stirring mechanism 25 installed in the drying chamber 7, a dried product is generated.
[0012]
Furthermore, in the apparatus of the present invention, the outer periphery of the closed container 3 which can be pressurized or depressurized is covered with a jacket 4, and a filter plate 5 is installed below the container 3, and the inside of the container 3 is provided with a filtration chamber 6 and a drying chamber 7. The filtration chamber 6 is provided with a filtration / drying tank 1 in which a plurality of separate chambers 15 are formed by a grid-like support plate 13, and the filtrate is discharged through a discharge port provided in each of the chambers 15. The cake discharged on the filter plate 5 and formed on the filter plate 5 is separated from the filtration chamber 6 toward the drying chamber 7 by the pressurized gas jetted from each of the outlets 11, and the container 3 is turned upside down while being heated upside down. The cake is pulverized by a stirring mechanism 25 installed in the chamber 7 to produce a dried product.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIGS. 1 and 2 show a first embodiment of the filtration / drying apparatus of the present invention. The filtration / drying tank 1 has a circular body 2 having upper and lower surfaces formed into symmetrical curved surfaces and capable of being sealed. A pressure or pressure reducing container 3 has a double wall structure in which the outer peripheral surface is covered with a jacket 4, and a filter plate 5 is provided below the container 3, and a filter chamber 6 and a drying chamber 7 are provided in the container 3. It has a separate structure.
[0014]
In a normal state, as shown in FIG. 1, the filtration chamber 6 is located below and the drying chamber 7 is located above, and rotating shafts 8 protruding on both sides of the container 3 are rotated by bearings provided on a gantry 9. By supporting one of the rotating shafts 8 to a reversible motor (not shown) via a belt, a chain, or the like, the entire filtration / drying tank 1 can be continuously rotated in one direction or can be inverted. ing.
[0015]
As shown in FIG. 2, a supply port 10 for the undiluted slurry is provided above the container 3 and a discharge port 11 for the filtrate is formed in the center of the bottom as shown in FIG. Are connected by a discharge pipe 12, and the filtrate filtered by the filter plate 5 is discharged by vacuum suction or by keeping the inside of the container 3 in a pressurized state.
[0016]
The supply port 10 is connected to a stock slurry tank (not shown) by a pipe, and the stock slurry is fed into the container 3 through the supply port 10 by a pump. For this reason, in the filtration / drying tank 1, the drying chamber 7 is normally located above, and the filtration chamber 6 is normally located below.
[0017]
A plurality of support plates 13 are provided in the filtration chamber 6. The support plate 13 supports the filter plate 5 from below with respect to the weight of the laminated cake, holds the filter plate 5 from the pressure of the gas injected at the time of blowback, and guides the gas injection direction. Also serves as.
[0018]
FIG. 3 shows an example of the filtration chamber 6, in which the side and bottom surfaces of the support plates 13 combined in a lattice are fixed in the filtration chamber 6 by welding, and the inside of the filtration chamber 6 is divided into a plurality. The crossed lower portion of the grid-like support plate 13 is cut out in a circular or square shape to form a communication channel 14, and a filtrate, a pressurized gas, and the like can flow between the divided chambers 15 through the communication channel 14. Has become.
[0019]
As described above, the discharge port 11 provided at the central bottom of the filtration chamber 6 serves as a pressure inlet for the pressurized gas for discharging the filtrate and for blowback, and is located above the discharge port 11. A circular or square notch is provided in the lower end surface of the support plate 13 to form a diffusion space 16.
[0020]
FIG. 4 shows another example of the filtration chamber 6, in which the pressure of the pressurized gas is applied to the bottom of the filtration chamber 6 facing each of the divided chambers 15 divided by the grid-like support plate 13 as described above. Discharge ports 11 also serving as inlets are provided, and each discharge port 11 is connected by a branch pipe 17 and connected to one discharge pipe 12. Therefore, the lower end surface of the grid-like support plate 13 is fixed to the bottom surface of the filtration chamber 6, and each of the divided chambers 15 is cut off and formed independently.
[0021]
The configuration shown in the first embodiment is as described above. Next, the filtration and drying operations of the stock slurry will be described.
The undiluted solution slurry is supplied into the container 3 from the slurry supply port 10 directed upward of the filtration / drying tank 1, and filtration is performed while the pressure in the container 3 is increased or reduced, and the filtrate is discharged from the filtrate outlet 11. Discharge to the outside through tube 12. The filtrate may be discharged through a pipe (not shown) by opening a valve 18 connected to the discharge pipe 12.
[0022]
After the supply of the undiluted slurry after the supply of the undiluted slurry of a predetermined amount or the filtration treatment for a predetermined time, a cake layer is formed on the filter plate 5. Thereafter, a heating medium is supplied into the space between the container 3 and the jacket 4 to heat the container 3, and the filtration / drying tank 1 is rotated in one direction or alternately reciprocated while the pressure in the container 3 is increased or reduced. The cake is dried upside down. A heat medium such as hot water, hot air or steam is supplied into the space from a supply port 20 through a supply pipe 19 connected to a supply device (not shown) to heat the container 3.
[0023]
Prior to drying of the cake, the filtration / drying tank 1 is turned upside down from the state shown in FIG. 1 and a pressurized gas is jetted downward from the filtration chamber 6 located above toward the drying chamber 7 below. That is, gas is injected by using the filtrate outlet 11 and the discharge pipe 12 described above, and the discharge pipe 12 is connected to a gas pumping device (not shown).
[0024]
In the case of the filtration chamber 6 shown in FIG. 3, if a pressurized gas is injected from the discharge port (gas pressure inlet) 11 into the filtration chamber 6, the gas flows into the respective chambers 15 from the diffusion space 16 through the communication flow path 14. It is dispersed and injected into the drying chamber 7 through the entire surface of the filter plate 5.
In the case of the filtration chamber 6 shown in FIG. 4, if gas is ejected from each outlet 11 through the discharge pipe 12 through the branch pipe 17, gas is ejected from each chamber 15 to the filter plate 5. The inside of the container 3 is in a depressurized state when the gas is injected.
By injecting the pressurized gas from the back surface of the filter plate 5 (the surface opposite to the cake attachment surface), the cake attached to the filter plate 5 is peeled off and falls.
[0025]
The pressurized gas may be injected through the valve 18. That is, the valve 18 may be connected to a gas pumping device through a pipe, the valve 21 on the discharge pipe 12 side may be closed, the valve 18 may be opened, and gas may be injected from the discharge port 11 into the filtration chamber 6.
In addition, the case where the gas is injected by inverting the filtration chamber 6 and the drying chamber 7 up and down has been described. However, the present invention is not limited to this, and in the state of FIG. Alternatively, the gas may be injected toward 7.
[0026]
After peeling the cake from the upper surface (front surface) of the filter plate 5 as described above, if the filtration / drying tank 1 is rotated or inverted, the cake formed on the filter plate 5 will be vertically or rotationally (inverted) direction. The cake circulates, and the cake hits the inner wall surface of the container 3 and is gradually dried by the mutual contact of the cake to finally produce a dried product such as a crystal or a granular material. Although the heating medium is continuously fed, it is discharged from a discharge port 22 provided at the bottom of the container 3 through a discharge pipe 23.
[0027]
After performing the drying process for a necessary time, the filtration / drying tank 1 is rotated and stopped so that the dry matter discharging valve 24 provided on the upper central surface of the drying chamber 7 faces downward, and the discharging valve 24 is opened. Take out the dried material such as crystals or granular material. Prior to the gas injection and drying steps, the cake may be washed by injecting washing water from the slurry supply port 10 to wash out the impurities.
[0028]
Since the container 3 is rotated or inverted, a slurry supply pipe connected to the slurry supply port 10, a filtrate discharge pipe 12, a heat medium supply pipe 19, a heat medium discharge pipe 23, and the like are not shown. It is connected to a slurry tank, heat medium supply device, suction pump, etc. via a rotary joint, and does not hinder rotation or inversion. However, there is also a case where a rotary joint is directly or rotatably or reversibly connected by a manual device or a special device without providing a rotary joint.
[0029]
FIG. 5 and FIG. 6 show a second embodiment of the present invention, and the same parts as those in the above-described embodiment use the same reference numerals.
In this embodiment, the structure of the filtration / drying tank 1 itself is the same as that of the above-described embodiment, but a stirring mechanism 25 is installed along a curved upper surface in the drying chamber 7 of the container 3 to stir when drying the cake. The feature is that the cake is pulverized by rotating the mechanism 25. For this purpose, a motor 26 with a speed reducer is installed on the upper surface of the center of the container 3 so that the stirring mechanism 25 rotates in one direction. An outlet 27 for dried matter is provided on the curved upper surface in the vicinity of the motor 26, and is opened and closed by an opening / closing cylinder 28.
[0030]
As in the case of the above embodiment, the filtration of the undiluted slurry is completed, and the filtration / drying tank 1 is turned upside down from the state of FIG. 1 to dry the cake laminated on the filter plate 5. Therefore, in the case of this embodiment, the filtration / drying tank 1 does not rotate or invert, but stops in a state where the tank is turned upside down.
[0031]
If the filtration / drying tank 1 is reversed, the cake falls under its own weight. However, similarly to the above case, the pressure gas is injected from the filtration chamber 6 toward the drying chamber 7 to peel off the cake adhering to the filter plate 5. And let it fall. The cake that has fallen is crushed by the stirring blades 29 of the rotating stirring mechanism 25. After performing the stirring operation for a predetermined time, the discharge port 27 in the downward state is opened by the cylinder 28 to discharge the dried product.
[0032]
In each of the embodiments described above, since the injection pressure of the pressurized gas is applied to the filter plate 5, it is necessary to make the filter plate 5 robust.
FIG. 7 shows an example of a filter plate 5 having robustness, in which a filter cloth 31 is provided on the upper surface of a metal support plate 30 having a large number of pores. And the drying room 7. In FIG. 7, when a pressurized gas is injected from below the filtration chamber 6, the gas is pressed into the drying chamber 7 through the support plate 30 and the filter cloth 31, but is injected because the filter cloth 31 is supported by the support plate 30. A stable state can be maintained without being lifted by pressure.
[0033]
In each of the above-described embodiments, the washing pipe 32 is attached to the container 3. Washing water can be sprayed from the washing pipe 32 into the container 3 to wash the cake before the drying process or to discharge the dried product, and then place the filtration / drying tank 1 in the normal position in FIG. To wash the inner surface of the container 3, the stirring mechanism 25, the filter plate 5, and the like. Note that the water after washing may be discharged from the outlet 11.
[0034]
In order to dry the cake, the filtration / drying tank 1 is turned upside down and stopped. For this purpose, the detection arm 33 and the sensor 34 can be used. The detection arm 33 protrudes vertically upward from the rotation shaft 8, and the sensor 34 is installed on a side surface of the gantry 9.
[0035]
When the filtration / drying tank 1 is rotated in one direction from the normal position in FIG. 1, the detection arm 33 is simultaneously rotated. When the sensor 34 detects the detection arm 33, a stop signal is sent to the rotation drive motor of the filtration / drying tank 1. The feed and filtration / drying tank 1 can be stopped at a position where the tank is turned upside down. If the detection arm 35 is protrudingly provided on the opposite side to the detection arm 33, after the dried matter is discharged, the filtration / drying tank 1 is rotated by the motor in the return direction, so that the sensor 34 causes the detection arm 35 to rotate. Upon detection, the filtration / drying tank 1 stops in the state shown in FIG.
[0036]
In each of the embodiments described above, the case in which the jacket 4 covers the entire surface of the container 3 has been described. However, the filtration / drying tank 1 may be divided vertically with the filter plate 5 as a boundary. This is for maintenance and inspection in the filtration chamber 6 and the drying chamber 7, cleaning and replacement of the filtration plate 5, and the like. For this reason, the container 2 is vertically separated from the filter plate 5 as a boundary and is closely connected.
[0037]
Therefore, the jacket 4 is also vertically separated by the connecting portion as a boundary, and the jacket 4 surrounding the drying chamber 7 and the filtration chamber 6 is also provided with a supply pipe 19, a supply port 20 and a discharge port 22, respectively. Each discharge port 22 is connected to one discharge pipe 23.
[0038]
【The invention's effect】
According to the present invention described above, after the undiluted slurry is filtered, the cake formed on the filter plate 5 is dried while rotating or reversing the filtration / drying tank 1, from the filtration chamber 6 to the drying chamber 7. If the pressurized gas is injected toward the filter plate, the cake adhering to the filter plate 5 can be peeled off. Thereafter, if the filtration / drying tank 1 is rotated or inverted while the container 3 is heated, the cake is dried and pulverized, and a dried product as a crystal or a granular material is generated.
[0039]
In particular, since the filtration chamber 6 is divided into a plurality of chambers 15 by the grid-like support plate 13 and the pressurized gas is injected into the drying chamber 7 through each of the division chambers 15, pressure is injected from the entire surface of the filtration plate 5. Can be. In addition, when the stirring mechanism 25 is installed in the drying chamber 7 and the cake after filtration is dried, if the filtration and drying tank 1 is turned upside down and the stirring mechanism 25 is rotated, the cake is pulverized while drying, A dried product can be efficiently produced in a short time.
[Brief description of the drawings]
FIG. 1 is a partially sectional front view showing a first embodiment of a filtration / drying apparatus of the present invention.
FIG. 2 is a side view showing a first embodiment of the filtration / drying device of the present invention.
FIG. 3 is a perspective view showing an example of a filtration chamber used in the filtration / drying apparatus of the present invention.
FIG. 4 is a perspective view showing another example of the filtration chamber used in the filtration / drying apparatus of the present invention.
FIG. 5 is a partially sectional front view showing a second embodiment of the filtration / drying apparatus of the present invention.
FIG. 6 is a side view showing a filtration and drying apparatus according to a second embodiment of the present invention.
FIG. 7 is a cross-sectional view showing an example of a filter plate having robustness.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration / drying tank 2 Circular trunk 3 Container 4 Jacket 5 Filtration plate 6 Filtration chamber 7 Drying chamber 8 Rotating shaft 9 Stand 10 Slurry supply port 11 Filtrate discharge port 12 Filtrate discharge pipe 13 Support plate 14 Communication channel 15 Division Chamber 16 Diffusion space 17 Branch pipe 18 Valve 19 Heat medium supply pipe 20 Heat medium supply port 21 Valve 22 Heat medium discharge port 23 Heat medium discharge pipe 24 Dry matter discharge valve 25 Stirring mechanism 26 Motor with reduction gear 27 Dry matter discharge Outlet 28 Opening / closing cylinder 29 Stirrer blade 30 Filtration support plate 31 Filter cloth 32 Cleaning pipe 33 Detection arm 34 Sensor 35 Detection arm

Claims (4)

The outer periphery of the pressurized or depressurized sealed container 3 is covered with a jacket 4, and a filter plate 5 is provided below the container 3 to separate the inside of the container 3 into a filtration chamber 6 and a drying chamber 7. 6 is divided into a plurality of chambers 15 by a grid-like support plate 13, and each of the divided chambers 15 filters the stock solution slurry by the filtration / drying tank 1 communicable by a communication channel 14, and the filtrate is discharged from the discharge port 11. At the same time, the cake formed on the filter plate 5 is separated from the filtration chamber 6 toward the drying chamber 7 by the pressurized gas jetted from the discharge port 11, and the filtration / drying tank 1 is rotated or inverted to heat the container 3. A filtration / drying apparatus characterized in that a cake is dried while drying to produce a dried product. The outer periphery of the pressurized or depressurized sealed container 3 is covered with a jacket 4, and a filter plate 5 is provided below the container 3 to separate the inside of the container 3 into a filtration chamber 6 and a drying chamber 7. 6 filters the undiluted slurry by the filtration / drying tank 1 in which a plurality of independent divided chambers 15 are formed by the grid-like support plate 13, and the filtrate is discharged from the outlets 11 provided in each divided chamber 15 and the filtration plate is filtered. The cake formed on 5 is separated from the filtration chamber 6 toward the drying chamber 7 by the pressurized gas injected from each outlet 11, and the filtration / drying tank 1 is rotated or inverted, and the cake is heated while the container 3 is heated. A filtration / drying apparatus characterized in that a drying process is performed to produce a dried product. The outer periphery of the pressurized or depressurized sealed container 3 is covered with a jacket 4, and a filter plate 5 is provided below the container 3 to separate the inside of the container 3 into a filtration chamber 6 and a drying chamber 7. 6 is divided into a plurality of chambers 15 by a grid-like support plate 13, and each of the divided chambers 15 filters the stock solution slurry by the filtration / drying tank 1 communicable by a communication channel 14, and the filtrate is discharged from the discharge port 11. At the same time, the cake formed on the filter plate 5 is separated from the filtration chamber 6 toward the drying chamber 7 by the pressurized gas injected from the discharge port 11, and is placed in the drying chamber 7 while heating the container 3 which is turned upside down. A filter and drying device, wherein the cake is pulverized by the stirring mechanism 25 to produce a dried product. The outer periphery of the pressurized or depressurized sealed container 3 is covered with a jacket 4, and a filter plate 5 is provided below the container 3 to separate the inside of the container 3 into a filtration chamber 6 and a drying chamber 7. 6 filters the undiluted slurry by the filtration / drying tank 1 in which a plurality of independent divided chambers 15 are formed by the grid-like support plate 13, and the filtrate is discharged from the outlets 11 provided in each divided chamber 15 and the filtration plate is filtered. The cake formed on 5 is separated from the filtration chamber 6 toward the drying chamber 7 by the pressurized gas injected from each outlet 11, and a stirring mechanism installed in the drying chamber 7 while heating the container 3 which has been turned upside down. 25. A filtration / drying device, wherein the cake is crushed by 25 to produce a dried product.

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