JP3529056B2 - Apparatus for discharging powder and granules in tank and devices using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for discharging a granular material of a tank, which has an effect that the total height of the tank for storing the granular material can be reduced and the granular material can be efficiently discharged. The present invention relates to devices using this.

[0002]

2. Description of the Related Art For example, in a storage tank for temporarily storing powdery or granular material and quantitatively supplying the powdery or granular material from a lower discharge port,
Due to the crosslinking phenomenon due to the compaction and moisture absorption of the powder itself,
In some cases, smooth discharge from the lower part of the tank is hindered. To cope with this, as shown in FIG. 16, the lower part of the storage tank 50 has a conical shape, and the conical portion 50A has a conical shape as shown in the drawing. The aerators 51, 51 for preventing or destroying the crosslinking phenomenon are provided, and dry air is supplied at the time of discharging the powder and granules. Further, a mechanical hammering may be provided to give an impact by hitting to destroy the crosslinking phenomenon.

On the other hand, raw water is supplied from the lower side of the filter medium layer to pass through the filter medium by an upward flow to filter the raw water, and the filter medium in the tank is continuously or intermittently fed from the lower side of the filter medium layer. An upflow type filtration device has been developed and put on the market, which is sequentially taken out, washed, and returned to the upper surface side of the filter medium layer. As such an upward flow type filtering device, for example, as shown in FIG. 17, an air lift pipe 61 and an air supply pipe 62 for supplying air to the air lift pipe 61 are provided vertically in a substantially central portion of a tank 60 to lift the filter medium. There is an apparatus that configures a delivery air lift pump and includes a cleaning device 64 provided on the upper side of the air lift pipe 61 with a cleaning pipe 63 that is loosely fitted in a state where an annular space is formed between the air lift pipe 61 and the air lift pipe 61. The raw water is supplied from the lower part of the tank 60 and passes through the filter material layer in an upward flow to remove suspended solids, resulting in clear filtered water. After the filtered water passes through the filter medium area and reaches the filtered water area, it passes through the filtered water overflow weir 65 and is discharged to the outside. On the other hand, the filter medium is the conical portion 60 under the tank 60.
After being gradually lowered by A, suspended solids adhering to the filter medium are peeled off in the process of rising in the air lift pipe 61, and when the cleaning pipe 63 is dropped, it is washed by being brought into countercurrent contact with the filtered water, and again. It is returned to the upper surface of the filter medium layer.

[0004]

However, in the above-mentioned powder and granular material storage tank, the lower part of the storage tank must be formed into a conical shape for the natural flow of the powder and granular materials, and the total height is inevitably high. It has problems such as lack of efficiency and economy. Further, even preventing destroy crosslinking phenomena by aerator when granular material discharge, within reach of dry air is limited, because that was an inferior to granule whole, occurs still crosslinking phenomenon smooth discharge inhibition Tended to be.

Similarly, in the above-mentioned upflow type filtering device, the bottom of the tank for storing the filtering material must have a conical shape, and since the total height becomes high, when it is installed indoors,
In addition to the height of the building corresponding to this being required, the height of the raw water pump will be higher due to the higher overall height, and thus greater capacity will be required. Further, there is a problem that it is uneconomical because the conical bottom portion must be filled with a filter material that does not contribute to filtration, and an extra filter material is required accordingly.

Therefore, the main object of the present invention is to make it possible to reduce the total height of the tank in which the powdery particles are stored, and
A powder and granular material discharge device for tanks that has the effect of efficiently discharging powder and granular materials has been proposed, and by utilizing this, a powder and granular material storage tank and a filter medium that prevent the crosslinking phenomenon and enable smooth discharge. The object of the present invention is to propose an upflow-type filtration device which can improve the cleaning effect and can significantly reduce the equipment cost.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, a powdery-particle discharging device for a tank according to the present invention is configured such that the inside of a flat-bottomed tank is provided with a drop adjusting plate so that the powdery-particles storing chamber side and the lower side thereby divided into a powder or granular material discharge chamber side, around the powder or granular material discharge chamber, a plurality of injection for injecting a gas or liquid inwards
A ring-shaped injection device having an injection nozzle is provided , and a powdery material outlet is provided at a substantially central position surrounded by the injection device, and the injection nozzles are in the same direction with respect to a central point direction line.
It is characterized by having a swing angle .

Further, a powdery-particle storage device using this device is a powdery-particles storage tank having a storage tank for temporarily storing the powdery particles and a discharge port connected to the discharging device at the lower part of the storage tank. , The bottom of the storage tank is made flat, and the inside of the storage tank is divided into a powder storage chamber side on the upper side and a powder discharge chamber side on the lower side by a fall adjustment plate, and the powder discharge chamber a plurality of injection nozzles for injecting gas toward the periphery, inwardly of
Having provided a ring-shaped injection device, the discharge port is provided in a substantially central position surrounded by the injection device, the injection nozzle
The swing angle is set in the same direction with respect to the center point direction line.
It is characterized by being.

Further, the upward flow type filtration device utilizing the discharge device supplies raw water from the lower side of the filter medium layer to pass through the filter medium by the upward flow to filter the raw water, and at the same time, to store the raw water in the tank. In an upward flow type filtration device in which the filter medium is continuously or intermittently taken out from the lower face side of the filter medium layer, and is washed and returned to the upper face side of the filter medium layer, the bottom of the filter medium tank is made flat. together, then divided into the medium discharge chamber side of the filter medium storage chamber side of the upper inner filter media tank by falling adjusting plate and the lower, and the periphery of the filtrate material discharge chamber, a plurality of injecting raw water inward injection Ring with nozzle
The Jo injector is provided, the filter media outlet is provided in a substantially central position surrounded by the injection device, the injection nozzle, the central point direction
The swing angle is set in the same direction with respect to the line . In this case, at the approximate center of the filter media tank,
An air lift pipe for vertically extending the filter medium through the filter medium layer is provided, and a filter medium cleaning device is continuously provided on the air lift pipe, and the filter medium discharged from the cleaning device is returned to the upper surface side of the filter medium layer again. To Further, by providing a suction promoting plate in a flange shape or a trumpet shape at the lower end suction port of the air lift pipe, the suction of the filter medium can be efficiently and stabilized.

In these devices, it is desirable that the drop adjusting plate is a plurality of inclined plates arranged so as to overlap each other when viewed in plan, and the direction of fluid injection from the injection device is centered. 1. In the same direction with respect to the dotted line
It is desirable to provide a swing angle of 5 to 7.5 °.

[0011]

In the present invention, the drop adjusting plate divides the upper granular material storage chamber side from the lower granular material discharge chamber side. The powder particles falling from the drop adjusting plate little by little are gathered in the center by the fluid ejected from the injection device in the powder particle discharge chamber side and discharged from the discharge chamber side. Therefore, unlike the conventional tank, the cone portion is not required in the lower portion of the tank, and the total height can be reduced accordingly. According to a trial calculation by the present inventors, by applying the discharge device according to the present invention,
The total height of the tank can be reduced by about 20 to 30%. Further, in the case of the storage tank, since the dry gas injected from the injection device passes through the drop adjusting plate and rises between all the powder particles stored in the tank, the powder particles are generated without causing a crosslinking phenomenon. It becomes possible to discharge smoothly.

Further, when applied to the upflow type filtering device, the cleaning effect is improved because the filtering medium is washed by the raw water jetted from the jetting device in the filtering medium discharge chamber. Further, the operating weight becomes light, which is particularly advantageous when installed indoors. Furthermore, since the total height will be lower, the head of the raw water pump will be lower, and the pump capacity will also be low,
According to a trial calculation by the present inventors, the amount of the filter material can be reduced by about 45 to 55%, which is significantly more economical than the conventional one.

[0013]

EXAMPLES The present invention will be described in detail below based on examples.
First, a case where the powdery- or granular-material discharging structure according to the present invention is applied to a storage tank will be described. In FIG. 1, a storage tank 1 has a bottom portion 1B having a substantially flat bottom according to the present invention, and has a discharge port 6 recessed in a substantially central portion thereof, and a slide gate for controlling opening and closing is continuously provided to the discharge port 6. Valve 7
And a rotary valve 8 for quantitative cutout. Also, the upper lid 1A
At the same time, a granular material receiving port 1a is formed, and an air discharging port 1b is formed so that dry air injected from an air inflow pipe 5 described later is discharged to the outside.

In the present invention, a horizontally arranged drop adjusting plate 4 is arranged near the bottom of the storage tank 1, and the inner space of the tank 1 is provided with an upper granular material storage chamber 2 and a lower granular material. It is divided into a body discharge chamber 3 (hereinafter also simply referred to as a discharge chamber), and a ring-like shape in which a large number of injection nozzles 5a, 5a ... An air inflow pipe 5 is provided. The drop adjusting plate 4 has an appropriate inclination angle θ ₁ and pitch P ₁ as shown in FIG. 6, for example.
Is composed of a large number of inclined plates 40 , 40 ... Arranged at (θ ₂ is determined by this pitch P),
The arrangement is preferably in a polygonal shape such as a hexagonal shape shown in FIG. 4, or as shown in FIG. 5, a suitable polygonal shape such as a quadrangular shape when the tank is a square. All the inclined plates 40, 40 ... Are arranged so as to be inclined toward the center side. In the inclined plate 40, by making the angle of θ ₁ + θ ₂ equal to or slightly smaller than the angle of repose of the granular material,
When the injection from the air inflow pipe 5 is stopped, the solid state is achieved, and the powder particles are stopped without falling, as shown on the right side of FIG. However, when the air from the air inflow pipe 5 is jetted and passes between the inclined plates 40, 40, as shown on the left side of FIG. Run down into chamber 3. In addition, in FIG. 1, the umbrella 18 formed in the central portion of the drop adjusting plate 4 is for preventing a dead zone in which powder particles are accumulated.

As another embodiment of the drop adjusting plate 4, as shown in FIG. 7, a perforated plate 41 in which a large number of powder particle dropping holes 41a, 41a ... Are formed at an appropriate pitch is used. Alternatively, as shown in FIGS. 8 and 9, two perforated plates 42, 4 are vertically spaced from each other.
3 can be arranged such that the respective powder and granule drop holes 42a, 43a ... Are staggered with respect to each other. in this case,
The hole diameters D _{1 and} D _{2 of the} perforated plates 42, 43, the spacing S, and the hole pitches HP _{1 and} HP ₂ are the same as those of the inclined plate 40. By setting the angle θ connecting the edge with the hole 43a to be approximately the same as the angle of repose of the granular material, it stagnates when there is no passing air and loosens to the discharge chamber 3 when there is passing air. Furthermore, FIG.
0 and FIG. 11, a perforated plate 44 having a certain thickness and tapered drop holes 44a to 46a.
~ 46 can also be used. In this case, the drop hole 4
The taper of 4a and 45a is set to have the minimum diameter at the boundary with the granular material storage chamber 2. As a result, fluidization and loosening of the powder and granules are promoted as the air injection speed increases, and the powder and granules flow smoothly. Further, in the case of a plurality of arrangements, the taper of the drop hole 46a of the lower porous plate 46 is formed so as to expand toward the upper side. As a result, the dead zone where the granular material is deposited can be eliminated on the upper surface of the lower porous plate 46, and the powder can be smoothly flowed into the discharge chamber 3.

On the other hand, the air inflow pipe 5 is, as shown in FIG. 3, provided with a large number of injection nozzles 5a, 5a, ... It has a function of collecting the flowed powder and granular material in the substantially central portion. Each of the jet nozzles 5a is attached in the same direction with a slight swing angle α in plan view, and a vortex flow toward the center is formed by the jetted air. The powder or granules flowing down into the discharge chamber 3 are transferred to the center side by riding on this blast air, collected at the center of the vortex where the wind force is weakened, and discharged from the discharge port 6 formed in this portion.

Further, an air inflow line for supplying jet air is formed to the air inflow pipe 5. The air inflow line includes a storage line 10 and a discharge line 11, and lines 10 and 11 are provided with automatic valves 12 and 15, flowmeters 13 and 16, and control valves 14 and 17, respectively. In the state where the powdery particles are stored in the tank 1, the discharge line 11 is kept closed and the storage line 10 is closed.
The automatic valve 12 on the side is intermittently opened, and a small amount of dry gas such as air is supplied into the discharge chamber 3 through the air inflow pipe 5 and the injection nozzle 5a. The supply air is the fall adjustment plate 4 (tilt plate 40).
After passing through, the powder enters into the granular body, passes through between the particles, and is discharged to the outside from the air discharge port 1b in the upper part of the tank 1. In addition, the amount of supply air is controlled by the control valve 14 of the storage line 10 so that the powder and granules fall.
It is adjusted so that it does not fall from the leveling plate 4 (tilt plate 40) .

When discharging the powder or granular material, the automatic valve 15 of the discharge line 11 is opened to supply the dry gas to the discharge chamber 3. The air supplied is the fall adjustment plate 4 (the inclined plate 4
0 ) when going up and going up, the fall adjustment plate 4 (tilt
The powder particles accumulated on the plate 40) are fluidized and loosened, and fall into the discharge chamber 3. The powder particles that have fallen are collected in the central portion by the air blown from the inflow pipe 5, and are discharged from the discharge port 6. The supply air volume is adjusted by the control valve 17 of the exhaust line 11 so as to match the exhaust volume of the granular material. In addition, the supply line can be switched between the lines 10 and 11
The automatic valves 12 and 15 are sequence-controlled.

As described above, according to the storage tank of the present invention,
At the time of storage, a small amount of dry air passes through the discharge chamber 3 and the drop adjusting plate 4 and is ventilated from the entire lower surface of the granular material, so that the entire amount of the granular material is dehumidified and the crosslinking phenomenon is prevented. Further, since the adjusted amount of air is supplied in an upward flow at the time of discharge, the crosslinking phenomenon is destroyed by fluidization at the same time as the flow-down action of the granular material, and smooth discharge is possible.

Next, the case where the present invention is applied to an upward flow type filtration device will be described in detail. In FIG. 2, the tank 20 has a bottom portion 20B as in the case of the storage tank.
According to the present invention, the tank 20 has a substantially flat bottom, a horizontal drop adjusting plate 4 is disposed near the bottom of the tank 20, and the empty space inside the tank 1 is located in the upper filter medium storage chamber 2 and the lower filter medium discharge chamber. Three
Further, a ring-shaped raw water inflow pipe 5 having a large number of injection nozzles 5a, 5a, ...

Further, an air lift pipe 21 for lifting the filter medium and an air supply pipe 26 for supplying air to the air lift pipe 21 are provided vertically in a substantially central portion of the tank 20 to form an air lift type pump, and an upper portion thereof. On the side, a cleaning device 23 having a cleaning pipe 22 that is loosely fitted in a state where an annular space is formed with the air lift pipe 21 is provided. In addition, a scattering prevention plate 24 is provided inside the cleaning device 23, and a weir pipe 25 for cleaning drainage is provided. On the other hand, in the upper part of the tank 20, a drain overflow overflow 27
Is provided, and the filtered water that has passed through the filtered water overflow weir 27 is discharged.

Raw water is supplied to the raw water discharge chamber 5 from the lower portion of the tank 20, and is injected into the discharge chamber 3 from the injection nozzles 5a, 5a. The raw water passes between the drop adjusting plates 4 and passes through the filter medium layer in an upward flow to remove suspended solids, thereby becoming clear filtered water. The filtered water passes through the filter medium area and the filtered water area 9
After reaching, the water flows over the drain overflow overflow weir 27 and flows out.

On the other hand, as for the filter medium soiled by trapping the suspended solids of the raw water, when the raw water passes between the drop adjusting plates 4, the filter medium accumulated on the drop adjusting plates 4 is fluidized, In order to loosen the density, the filter medium flows down into the discharge chamber 3 and rides on the flow of raw water injected from the raw water inflow pipe 5 and is collected in the central portion. The filter medium collected in the central portion is continuously or intermittently attracted by the upward flow of the air supplied into the air lift pipe 21 and is then sent inside the air lift pipe 21.
During this time, the air, the raw water, and the dirty filter medium are mixed and brought into contact with each other, so that the floating substances adhering to the surface of the filter medium are peeled off. The filter medium then flows out through the upper opening of the air lift pipe 21,
The gravity gently drops in the annular space between the cleaning pipe 22 and the air lift pipe 21. At this time, the countercurrent contact with the filtered water rising from the lower side of the washing pipe 22 causes the displacement washing to be carried out again, and the washing is returned to the upper surface of the filter medium section.

The raw water rising in the air lift pipe 21 together with the filter medium and the filtered water used for cleaning the filter medium in the cleaning pipe 22 become cleaning drainage, and the weir pipe 2 installed in the cleaning device 23.
5 is discharged to the outside. The scattering prevention plate 24 located above the air lift pipe 21 prevents the filter material blown up from the air lift pipe 21 from scattering. In addition, as a cleaning mechanism of the filter medium, another mechanism may be used, for example, by an ejector system or by continuously or intermittently taking out and cleaning by an air lift pipe provided outside the tank, and then returning it to the upper surface of the filter medium region again.

Further, as shown in FIG. 12, a suction promoting plate 28 having an appropriate shape like a flange is provided at the lower end suction port of the air lift pipe 21. By forming the suction space with the bottom plate 20B, the suction flow velocity is increased in the lower space of the suction promotion plate 28 and the peripheral portion thereof to promote the sand collecting action, so that the filter medium is efficiently sucked and the air lift pipe 21 It has the effect of significantly stabilizing the pumping performance of. Further, as the suction promoting plate, as shown in FIG. 13, it is also possible to use a suction promoting plate 29 having a lower end suction port opened in a trumpet shape.

[Experimental Example 1] In Experimental Example 1, an experiment was conducted to find a suitable range of the horizontal swing angle α of the injection nozzle 5a formed in the air (raw water) inflow pipe 5. In the experiment, as shown in FIG. 14, an inflow pipe 5 having a total of 16 injection nozzles 5a provided on the inner surface of a 1600 mmφ ring pipe 5A was used, and the angle of the injection nozzle 5a was variously changed.
The volume V, the aggregate diameter Φ, and the height h of the powder particles accumulated in the central portion were obtained. The results are shown in Table 1.

[0027]

[Table 1]

From Table 1, it was found that the case where the volume V of the aggregated powder and granules is the largest and the aggregate diameter Φ is the smallest and the swing angle is 5 ° is the most preferable. From FIG. 15, which is a graph showing the relationship between the volume of the aggregated powder and swing angle, it was found that the swing angle α is preferably in the range of 2.5 to 7.5 °.

[Experimental Example 2] In the present Example 2, a test was conducted to determine a suitable size of the suction promoting plate 28 provided at the lower suction port of the lift pipe 21 in the upflow type filtering device. . In the test, the filtration rate was set to 200 m / day, the air supply amount to the air lift pipe 21 was set to 40 Nl / min, the diameter of the suction promotion plate 28 was variously changed, and the change in the amount of sand lifted was examined.
The results are shown in Table 2.

[0030]

[Table 2]

From Table 2, it was found that the amount of lifted sand was maximized when the plate diameter was 200 mmφ. However, there is no significant difference in the amount of sand lifted when the plate diameter is 200 mmφ and when the plate diameter is 300 mmφ, and it was found that a sufficient effect can be obtained by setting the suction promoting plate 20 to have a diameter of 200 mmφ or more.

[Experimental Example 3] In Experimental Example 3, the inclined plate 40 is used.
Were tested for a suitable angular range of The flow rate of the filter medium is preferably an amount commensurate with the appropriate filter medium circulation rate for each filtration area of the filtration device. Therefore, the suitable flow rate in this experimental machine (tank diameter: φ1600 mm, filtration area: 2 m ² , filter medium: effective diameter of about 1 mm, uniformity coefficient of 1.4 or less) is 8-11 liters / min when the filtration speed is 200 m / day. Three
Since it is about 12 to 17 liters / minute in the case of 00 m / day, the test is carried out by finding a tilt angle range within the filter medium circulation amount range. Specifically, the arrangement angle θ ₁ of the inclined plate 40 is fixed, θ ₂ uniquely determined from the interval P is variously changed, and the value of θ ₁ + θ ₂ is changed between 25 and 35 °. The flow amount of the filter medium was examined. The results are shown in Table 3.
Shown in. The air supply amount of the air lift was 20 Nl / min.

[0033]

[Table 3]

From the results shown in Table 3, it has been found that it is desirable to select the inclination angle of the inclined plate 40 to be about θ ₁ + θ ₂ = 30 °. This is almost the same value as the angle of repose of the filter medium used in water, and it was found that the amount of falling sand increased rapidly when the angle of repose was exceeded. It was also found that the amount of falling sand increased as the flow rate (filtration rate) increased.

The experiment was further repeated to examine the relationship between the amount of falling sand and θ ₁ , θ ₁ + θ ₂ . As a result, θ ₁ +
It was also found that even if the value of θ ₂ was the same, the amount of falling sand increased as the value of θ ₁ increased.

[0036]

As described above in detail, according to the discharging apparatus of the present invention, it is possible to reduce the total height of the tank in which the powder and granules are stored and to efficiently discharge the powder and granules. Become. In addition, by applying this, a granular material storage tank that prevents the cross-linking phenomenon and enables smooth discharge can be obtained, and the upflow type that has a high cleaning effect on the filter medium and can significantly reduce the equipment cost A filtration device can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a powder or granular material storage tank according to the present invention.

FIG. 2 is a vertical cross-sectional view of an upflow filtration device according to the present invention.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV in FIGS. 1 and 2.

FIG. 5 is a plan view of another example of the inclined plate.

FIG. 6 is an enlarged cross-sectional view of a main part of the inclined plate.

FIG. 7 is a cross-sectional view showing another example of the drop adjusting plate.

FIG. 8 is a cross-sectional view showing another example of the drop adjusting plate.

9 is a partially cutaway plan view of FIG.

FIG. 10 is a cross-sectional view showing another example of the drop adjusting plate.

FIG. 11 is a cross-sectional view showing another example of the drop adjusting plate.

FIG. 12 is a vertical sectional view showing a state where a suction promoting plate is attached.

FIG. 13 is a vertical sectional view showing a state where another suction promoting plate is attached.

FIG. 14 is an explanatory diagram of a test procedure of Experimental Example 1.

FIG. 15 is a relationship diagram between the aggregate volume of powder and granules and the nozzle swing angle in Experimental Example 1.

FIG. 16 is a vertical cross-sectional view of a conventional granular material storage tank.

FIG. 17 is a vertical cross-sectional view of a conventional upward flow type filtration device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Storage tank, 2 ... Granule (filter material) storage chamber, 3 ... Granule (filter material) discharge chamber, 4 ... Drop adjusting plate, 5 ... Air (raw water)
Inflow pipe, 5a ... Injection nozzle, 6 ... Discharge port, 7 ... Slide gate valve , 8 ... Rotary valve, 9 ... Drainage area,
10 ... Storage line, 11 ... Discharge line, 12/15 ... Automatic valve, 13/16 ... Flowmeter, 14/17 ... Control valve, 20
... Tank, 21 ... Air lift pipe, 22 ... Cleaning pipe, 23 ...
Cleaning device, 24 ... Scatter prevention plate, 25 ... Dam pipe, 26 ... Air supply pipe, 27 ... Drain overflow weir, 28 ... Suction promotion plate, 40 ...
Inclined plate, 41-46 ... Perforated plate

Front page continuation (72) Inventor Yukio Nishida 2-17-15 Tsukushima, Chuo-ku, Tokyo Within Tsukishima Kikai Co., Ltd. (56) Reference JP-A-4-102579 (JP, A) JP-A-53-90068 (JP, A) Actually open 1-28913 (JP, U) Actually open 61-159007 (JP, U) Japanese Patent Sho 49-10874 (JP, B1) (58) Fields investigated (Int.Cl. ⁷⁾ , DB name) B65D 88/28 B01D 24/00

Claims (7)

(57) [Claims] 1. A flat-bottomed tank is divided into an upper granular material storage chamber side and a lower granular material discharge chamber side by a drop adjusting plate, and an inward direction is provided around the granular material discharge chamber. Having a plurality of injection nozzles for injecting gas or liquid toward the ring
The Jo injector provided, and provided with a powder or granular material outlet port in a substantially central position surrounded by the injection device, the injection nozzle, vibration in the same direction relative to the center point direction line
A device for discharging powder particles in a tank, characterized in that it is provided with a corner . 2. A storage tank for temporarily storing powder and granular material, and a powder and granular material storage tank having a discharge port connected to a discharge device at a lower portion of the storage tank, wherein the storage tank has a flat bottom, The inside of the storage tank is divided into the upper side of the granular material storage chamber and the lower side of the granular material discharge chamber by the fall adjustment plate, and around the inside of the granular material discharge chamber ,
Has multiple injection nozzles that inject gas inward
That, provided the ring-shaped injection device, the outlet in a substantially central position surrounded by the injection device is provided, wherein the injection nozzle, vibration in the same direction relative to the center point direction line
A granular material storage device characterized by being provided with a corner . 3. The raw water is supplied from the lower side of the filter medium layer to pass through the filter medium by an upward flow to filter the raw water, and the filter medium in the tank is continuously or intermittently supplied from the lower side of the filter medium layer. In an upward flow type filtration device which is sequentially taken out, washed and returned to the upper surface side of the filter medium layer, the bottom of the filter medium tank is made flat and the inside of the filter medium tank is stored by a fall adjustment plate to store the upper filter medium. A plurality of injection nozzles for injecting raw water toward the inside are provided, which are divided into a chamber side and a lower filter medium discharge chamber side, and are surrounded by the filter medium discharge chamber.
A ring-shaped injection device is provided, a filter medium outlet is provided at a substantially central position surrounded by the injection device, and the injection nozzle is shaken in the same direction with respect to the central point direction line.
An upward flow type filtration device characterized by being provided with a corner . 4. An air lift pipe for vertically extending the filter medium through the filter medium layer is provided at a substantially central position in the filter medium tank, and a filter medium cleaning device is provided continuously with the air lift pipe, The upward flow type filtering device according to claim 3, wherein the discharged filter medium is returned to the upper surface side of the filter medium layer again. 5. The upflow filtration device according to claim 4, wherein a suction promoting plate is provided in a flange shape or a trumpet shape at the lower end suction port of the air lift pipe. 6. The drop adjusting plate is a large number of inclined plates arranged so as to have overlapping portions with each other when seen in a plan view.
Or the apparatus according to item 3. 7. The fluid ejection direction from the ejection device is provided with a swing angle of 2.5 to 7.5 ° in the same direction with respect to the central point direction line. Equipment.