JP2548007B2 - Filter dryer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a filter dryer capable of simultaneously performing a filtering operation and a drying operation in a single device.

[Conventional technology]

In the production of chemicals, dyes, etc., batchwise reaction is performed for each lot, and beneficial substances are recovered from the reaction slurry. Collection is performed through operational procedures such as filtration, washing, and drying, and the amount handled at one time is in a wide range from several kg to several hundred kg in terms of powder. In many cases, a dedicated machine is placed for each operation, but when this dedicated machine is used, it takes a lot of time to carry out and carry, and there is a possibility that impurities may be mixed in during carrying.

Therefore, there is also an apparatus in which filtration and drying are carried out by a single apparatus, and such an apparatus is disclosed in JP-A-58-34.
There is one disclosed in No. 038. This apparatus is designed so that reaction operations can be performed at the same time, and a filter is provided at the upper part of the container and a stirring dryer is provided at the lower part, and the container itself is rotatable. In the collecting operation, first, the stock solution is introduced into a stirring dryer to accelerate the reaction, and then the container is inverted to separate the reaction slurry into a filtrate and a filter cake by a filter,
The filtrate is discharged out of the container and washed if necessary. Then, the container is returned to the original position, the filter cake accumulated on the filter is dropped into the stirring dryer, the stirring blade is rotated to pulverize, and at the same time, drying is performed using a heat medium such as steam. The dry powder is taken out through an outlet provided at the bottom of the container.

[Problems to be solved by the invention]

The above equipment is free from the trouble of carrying out, transporting, and throwing in, which can be seen in a dedicated machine, and contamination due to mixing of impurities can be avoided, but it is not possible to move on to the next operation unless one operation is completed, and generally treated. Time is long. Therefore, the amount of processing is smaller than that of a dedicated machine, and if an equal amount of processing is attempted, there is a defect that the device becomes large.

Then, the objective of this invention is providing the filter dryer which solved the said problem.

[Means for solving problems]

The filter dryer according to the present invention which has achieved the above-mentioned object, in the upper part of the self-supporting container, a slurry supply port for introducing the slurry into the container, and an upper opening having a filter medium inside facing the lower end of the slurry supply port. A filter provided with a filter frame inside the container and discharging the filtrate to the outside of the container is provided, and the filter frame itself is inverted in a state where the container is self-supporting, and the filter cake accumulated on the filter material is dropped. A tumbling means is provided, a dryer is provided in the lower part of the container facing the lower side of the filter frame in a state after the tumbling, and receiving the dropped filter cake and drying the cake while stirring the bottom of the container. Is provided with an outlet for taking the dried product out of the container, and a filtering operation by the filter is enabled in a drying operation process by the dryer.

[Work]

In the present invention, the slurry can be filtered even while the filter cake is being stirred and dried, and the two operations can be performed in parallel. You can

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The apparatus shown in the drawing is a slurry S in a cylindrical container 2 standing on a foundation 1.
The upper part 2A of the container 2 is the filtering place of the slurry S, the lower part
2B is applied to the place where filter cake C is dried. A supply port 3 for the slurry S is provided at the upper portion 2A of the container 2, and an outlet 4 for the dry powder D is provided at the bottom portion 2C. The supply port 3 extends above a filter 5 to be described later, and has a distributor 3a at its tip. The distributor 3a has an effect of uniformly dispersing the slurry S on the filter 5 and preventing uneven distribution of the filter cake C during filtration. On the other hand, the outlet 4 is formed in a flange shape, and is closed by the blind flange 4a except when the dry powder D is taken out.

The above-mentioned filter 5 is arranged below the supply port 3, and the filter 5 is composed of a bowl-shaped filter frame 6 and rotating shafts 7a, 7b arranged on the same line on the left and right sides thereof. The rotary shafts 7a and 7b are integrated at the bottom of the filter frame 6, penetrate the wall surface of the container 2, and are rotatably supported by the columns 8a and 8b erected on the foundation 1. Then, flanges 2a, 2b are formed on the outer wall surface of the container 2 concentrically with the rotating shafts 7a, 7b, and the packings 10a, 10b inserted into the flanges 2a, 2b are pressed by the packing retainers 11a, 11b. ing. Therefore, airtightness is maintained between the container 2 and the rotating shafts 7a, 7b by the packings 10a, 10b.

A vacuum filtration system is mainly adopted for the filter frame 6, and the inside of the frame 6 is divided into two by a horizontally laid filter medium 12. Filter material
For example, a filter cloth, a sintered wire mesh, a wire screen, etc. can be used for 12 and these can be used properly according to the purpose of filtration. Then, at the time of filtration, the filtrate needs to stay in the lower space inside the frame 6 and be discharged to the outside of the container 2, but in the embodiment, the rotary shaft 7b on the right side is constituted by a hollow pipe and the drainage pipe is formed. It also has. The rotating shaft 7b is connected to a downstream drainage pipe 14 via a rotary joint 13 so that the rotation is not restricted, and further connected to a subsequent filtrate tank 15. A filtrate pump is provided downstream of the filtrate tank 15.
16 is connected, and the filtrate in the frame 6 is quickly discharged by utilizing the suction force.

On the other hand, the filter frame 6 is turned over by a rotary shaft 7a on the left side in the drawing, and a turnover means 17 for performing this is provided at the shaft end. The overturning means 17 uses a motor 18 as a power source, and employs a method of transmitting a rotational force by means of sprockets 19a and 19b and a chain 20.
The sprockets 19a and 19b are fixed to the motor shaft and the rotary shaft 7a, respectively, and the chain 20 has two sprockets.
It is wound around 19a and 19b. In addition to this, it is also possible to adopt an overturning means, and the object can be achieved by, for example, a piston-crank mechanism, and it can be installed not only outside the container 2 but also inside.

As described above, the lower portion 2B of the container 2 is used as the drying chamber for the filter cake C. In the embodiment, the dryer 21 is installed over the inside and outside of the lower portion 2B of the container in order to perform the drying in a short time and effectively. ing. The dryer 21 performs drying while stirring, and vibration is used for stirring, and a heat medium such as steam is used for drying the filter cake C. First,
Describing from the drying method, a large number of hollow and flat heating plates 22, ... Are arranged in the radial direction in the lower part 2B of the container, and the heating medium is supplied to each heating plate 22, so the upper end is a container. 2 From the outside, it is connected to a heat medium introduction pipe 23 drawn above the heating plate 22 through the side wall of the container upper portion 2A. From a morphological point of view, the lower end of the heating plate 22 is formed in an arc shape, and the contour of the horizontal cross section is formed in a crescent shape as shown in FIG. As will be described later, this form has an effect of effectively stirring the filter cake C as well as heating it. A drain pipe 24 leading to the outside of the container 2 is drawn into the bottom of each heating plate 22, and the liquid L drained inside is discharged from the container 2 at any time by the pressure of the heat medium. ing.

On the other hand, the bottom part 2C of the container is also framed according to the shape of the lower ends of the heating plates 22, so that effective heating and stirring can be performed, and a jacket 25 is attached to the outside thereof so that heating can be performed from the outside. There is. An inlet 25a and an outlet 25b for the heat medium are provided at the top and bottom of the jacket 25, respectively.

In addition, the stirring of the filter cake C is performed in this embodiment by a vibrating machine 26 mounted directly below the bottom 2C of the container. The vibration exciter 26 uses a motor 27 as a power source to perform three-dimensional vibration, and has an upper weight 27a for adjusting horizontal movement in the upper part and an underweight 27b for adjusting vertical movement in the lower part. On the other hand, the container lower part 2B is joined to the lower end of the container upper part 2A via a bellows 28 so that three-dimensional vibration is possible. The bottom 2C of the container is supported by springs 29, ... Installed on the foundation 1 so that the bottom of the container 2 is separated from the heating plates 22, ...

When the filter cake C is agitated and dried by the dryer 21, water and volatile substances contained in the filter cake C are evaporated. Since it is necessary to discharge these vapors out of the system, a plurality of exhaust ports 30, ... Are provided in the container upper portion 2A. These exhaust ports 30, ... Are gathered together by an exhaust pipe 31 outside the container 2 and connected to a subsequent condenser 32. The above-mentioned filtrate pump is provided downstream of the condenser 32.
16 is arranged, and a vacuum pump 33 is connected downstream thereof. Further, since the dry powder D may float in the container 2 due to stirring and flow out to the outside through the exhaust ports 30, ..., The exhaust ports 30, ... Are provided with bag filters 34 ,. ing. In order to brush off the captured powder, a backwash system is connected to the exhaust system, and both systems are switched by backwash valves 35, .... As shown in the figure, a pressure tank 36 and a compressor 37 for sending air are connected to the backwash system.

Now that the configuration has been described, the operation of the present apparatus will be described.

First, the motor 18 of the overturning means 17 is rotated to direct the filtration frame 6 upward through the sprockets 19a and 19b, the chain 20, and the rotating shaft 7a, and then the slurry S is supplied from the supply port 3.
The slurry S is uniformly dispersed by the distributor 3a provided at the tip of the supply port 3 and drops onto the filter frame 6. The solid content contained in the slurry S is filtered by the filter frame 6 as a filter medium 12.
And the filtrate falls into the lower space in the frame 6 and is separated into a solid content and a filtrate. The filtrate passes through the hollow portion of the rotary shaft 7b that also serves as a drainage pipe, and flows into the filtrate tank 15 via the rotary joint 13 and the drainage pipe 14 that follow. The filtrate accumulated in the filtrate tank 15 is further sucked by the filtrate pump 16 and discharged to the outside of the system.

On the other hand, although the filter cake C (solid content) is successively deposited on the filter frame 6, when the filter cake C is deposited to a certain extent, the supply of the slurry S is stopped and the filter frame 6 is rotated as shown in FIG.
The filter cake C on the filter material 12 is dropped on the lower part 2B of the container by inverting it around 7a and 7b. There are various methods for determining the fall time. For example, the container may be provided with a small window to visually check. Further, as the filtration proceeds, the amount of the filtrate generally thins, and therefore it can be determined by the amount of the filtrate.

The fall of the filter frame 6 is performed according to the method described at the beginning,
After falling, the slurry S is returned to the original position and the slurry S is supplied again to prepare for the next stirring and drying.

For the filter cake C dropped to the lower part 2B of the container, regardless of the filtration of the slurry S, the heat medium introducing pipe 23 and the jacket 25
A heat medium such as steam is introduced into the heat medium inlet 25a of the container and heated from inside and outside of the container 1 through the heating plate 22, ... And the jacket 25, and at the same time, the motor 27 of the vibration exciter 26 is driven, and the spring 29 ,. The lower part 2B of the container supported by is vibrated in the three-dimensional direction. Due to this three-dimensional vibration, relative movement occurs between the lower part 2B of the container and the heating plates 22, ..., The filter cake C is spirally rolled by the crescent-shaped heating plates 22 ,. Then, the heating plates 22 and 22 are successively moved. With respect to the vertical direction, due to the relative movement between the lower part 2B of the container and the heating plates 22, ..., Flow, that is, from the center of the lower part 2B of the container to the bottom 2C and the wall surface of the container 2B,
A return flow is formed. Due to these complex movements,
The filter cake C is crushed, and at the same time, the area of contact with the heating plates 22, ... Or the jacket 25 is increased to accelerate heating and drying.

By this heating and drying, water and volatile substances contained in the filter cake C are vaporized, and a part of the dry powder D floats in the container 1 by stirring. Of these, vapor such as steam is sucked by the vacuum pump 33, enters the condenser 32 through the exhaust ports 30, and is condensed by the refrigerant. The condensate is separated in the filtrate tank 15 and discharged to the outside of the system together with the filtrate, while the non-condensed gas separated in the filtrate tank 15 is sucked by the vacuum pump 33 and discharged to the outside of the system. The dry powder D floating in the container 1 due to the vapor exhaust is captured by the bag filters 34, .... The captured dry powder D is blown off by switching the backwash valve 35 and blowing the compressed air from the compressor 37. The dropped powder D is dried again in the lower part 2B of the container. For this reason, the filter medium 6 is made vertical at the end of the filtration so that the dry powder is not accumulated.

On the other hand, as heating and drying proceed, the temperature inside the container 2 rises,
By measuring this temperature rise, it is possible to know the drying end time. Therefore, when a certain temperature is reached, the supply of heat medium such as steam is stopped, the blind flange 4a is removed, and the dry powder D is taken out from the take-out port 4 to a hopper (not shown).
In this case, taking out the shaker 26 completes the extraction earlier. Next, the outlet 4 is closed with the blind flange 4a,
Filter cake C filtered during stirring and drying is sequentially placed at the bottom 2B of the container.
And heat-dry by repeating the above procedure.

FIG. 6 shows another embodiment of the present invention. What is different from the previous embodiment is the agitator / dryer. Therefore, common parts are designated by the same reference numerals and the description thereof is omitted. In the agitator / dryer 40 in this embodiment, a motor 41 is used as a power source, and two shafts 42, 43 arranged in parallel are rotated to rotate the shafts 42, 43.
, 43a, ... and scraping plates 42b, ..., 43b
It is designed such that it is agitated and heated by ... Therefore, both shafts 42 and 43 penetrate the container lower portion 2B from a direction slightly oblique to the horizontal direction, are rotatably supported by the columns 44a and 44b on the foundation 1, and the motor 41 serving as a power source and the gears 45a to 45b.
Although not shown in the drawing, they are transmitted to each other and rotate in different directions from each other via an intermediate gear. This is 2
Although there is a direction, in the embodiment, as shown in FIG.
The space between 42 and 43 is taken from top to bottom. Then, flange portions 46a, 46b are formed on the outer wall surface of the container lower portion 2B concentrically with the rotary shafts 42, 43, and the packings 47a, 47b inserted into the flange portions 46a, 46b are pressed by the packing pressers 48a, 48b. It is rare. Therefore, these rotary shafts 42,4
Airtightness is guaranteed between the 3 and the lower part 2B of the container by the packings 47a and 47b.

As shown in FIG. 7, heating plates 42a, ... 43a ,. The heating plates 42a, 43a are formed into a flat plate and a fan shape, and the surfaces are mounted at right angles to the shafts 42, 43 or inclined so that a slight pushing force works so that the screw effect does not occur, Furthermore, the heating plates 43a, 42a of the other party are arranged at equal intervals in the directions of the shafts 42, 43 so as to enter each other. Therefore, the heating plates 42a, 43a hardly exhibit a stirring effect, and in order to reinforce the stirring effects, a plurality of scraping plates 42b, ... 43b, ... Are projected on the surface of each heating plate 42a, 43a. . And each scraping plate 42b, 43b is integrally formed on the front and back sides with respect to the heating plates 42a, 43a, and as shown in FIG.
It is formed to be curved in a concave shape.

The rotary shafts 42 and 43 are connected to the heating plates 42a, ..., 43a.
It is formed by a hollow pipe so that a heat source can be supplied to
Both ends have rotary joints 49 so that rotation is not restricted.
It is connected to the heat medium introduction space 50 and the drain pipe 51 via a and 49b. The bottom part 2C of the container is moved relative to the scraping plates 42b, ..., 43b so that the filter cake C is appropriately crushed, and
It is formed in an arc centered at 42, 43.

In this embodiment, the slurry S is filtered and dropped according to the previous embodiment, and the filter cake C is stirred and dried by heating plates 42a, ..., 43a ,. This is performed by the plates 42b, ..., 43b. Therefore, the explanation about filtering and dropping is given to the previous embodiment,
Here, mainly stirring and drying will be described.

First, a heat medium such as steam is introduced into the rotary shafts 42, 43 via the heat medium introduction pipe 50. The heat of the heat medium is transmitted to the heating plates 42a, ... 43a through the rotating shafts 42, 43, and finally, the scraping plate 42b,
..., 43b, ... is reached. Then, the motor 41 is driven to rotate both rotary shafts 42 and 43. Since both rotary shafts 42, 43 rotate between the shafts 42, 43 in a direction from top to bottom, this rotation causes the heating plates 42a, 43a attached to the respective rotary shafts 42, 43 to rotate.
Above 42,43 they move towards each other,
At the bottom, they move toward each other. Therefore, a shearing action is generated above the shaft and between the shafts by the cooperative action with the adjacent heating plate. The filter cake C dropped to the center enters between the shafts 42 and 43 and is crushed by the scraping plates 42b and 43b protruding from the heating plates 42a and 43a. Heating plate 4
Since the shafts 2a and 43a are mounted at right angles to the shafts 42 and 43, the movement in the axial direction is slow even if the shafts are inclined, and the crushed filter cake C easily passes through the bottom portion 2C to the container wall surface 2B. Along the way, it returns between the axes 42, 43 and is subjected to the same action. During this time, heat is transferred between the heating plates 42a and 43a and the scraping plates 42b and 43b, and the filter cake C is dried. When the filter cake C is reasonably dried, it is taken out in the same manner as in the previous example.

FIG. 8 shows a modification of the previous embodiment. Although the previous embodiment was constituted by two shafts, the agitator / dryer 60 according to this embodiment is constituted by one shaft, and the basic rotating shaft 61 is also arranged horizontally with respect to the lower portion of the container. The rotary shaft 61 is formed of a hollow pipe as in the previous embodiment, and airtightness is secured between the rotary shaft 61 and the container 2 as well.
It is rotatably supported by a and 44b. Both ends are connected to a heat medium introducing pipe 50 and a drain pipe 51 via rotary joints 49a and 49b. In addition, gears 45a and 45b are connected to the motor 41.

The heating plate 62 is different from that of the previous embodiment. In this embodiment, the heating plate 62 is formed in a circular shape as shown in FIG. 9, and the heating plate 62 attached to the center has the largest diameter, and the diameter decreases toward both ends. Is formed in. In line with this formation,
The container bottom portion 2C is formed with an arc on one side and a corner on the other side. The heating plate 62 is provided with the scraping plates 63, ... As in the previous embodiment.

In this embodiment, the filter cake slides along the container bottom 2C, while being scraped up by each scraping plate 63,
The powder collected in the center is distributed in two directions at the upper side, and the same repetition is performed. During this time, the filter cake is dried and taken out in powder form.

In the above description, the heating plate, jacket, etc. using a heating medium have been shown for heating / drying the filter cake, but in the present invention, a heating device using microwaves may be used instead of them. Further, the number of filters is not limited to one, and a plurality of filters can be provided. In this case, a switching valve is provided at the supply port, and when one of the filters is tumbled, the other filter is supplied. However, the slurry can be continuously supplied without stopping.

〔The invention's effect〕

As described above, according to the present invention, filtration and stirring /
Since the drying can be performed at the same time, the throughput can be increased without increasing the size of the apparatus. Further, since only the filtering machine, to be precise, only the filtering frame having the filtering material inside is tumbled, the apparatus is simpler and the required horsepower is reduced as compared with the case of rotating the entire container described in the above publication.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an explanatory view showing an overturned state of a filter frame, and FIG. FIG. 5 is an explanatory view showing a stirring situation on a horizontal surface, FIG. 5 is an explanatory view showing a stirring situation on a vertical surface, FIG. 6 is a longitudinal sectional view showing another embodiment, and FIG. 7 is a VII- of FIG. VII sectional view, FIG. 8 is a longitudinal sectional view showing a modification of FIG. 6, and FIG. 9 is a IX-IX sectional view of FIG. 2 …… Container, 2A …… Upper container, 2B …… Lower container, 2C ……
Bottom of container, 3 ... Supply port, 4 ... Outlet, 5 ... Filter, 6 ... Filter frame, 7a, 7b ... Rotating shaft, 13 ... Rotary joint, 14 ... Drainage pipe, 15 ... ... filtrate tank, 16 ...
Filtrate pump, 17 …… Tumble means, 21,40,60 …… Stirring dryer.

Claims (1)

(57) [Claims] 1. A container is provided with a slurry supply port for introducing a slurry into the container on an upper part of the self-standing container, and an upper opening filter frame having a filter medium inside thereof facing the lower end of the slurry supply port, and A filter is provided to discharge the filtrate out of the container, and the filter frame itself is tumbled in a state in which the container is self-supporting, and tumbling means for dropping the filter cake accumulated on the filter material is provided, A dryer is provided at the bottom of the container facing the lower part of the above-mentioned filter frame in a fallen state to receive the dropped filter cake and dry the cake while stirring it. A filter dryer, wherein a take-out port for taking out is provided, and a filtering operation by the filter is enabled in a drying operation process by the dryer.