JP4067680B2 - Flock derivation device in granulation dehydration device for suspension - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a floc derivation device in a granulation and dehydration device for a suspension.
[0002]
[Prior art and its problems]
Conventionally, the suspension is granulated in a stirring granulation tank, and the generated floc is led out of the tank and transferred to a dehydrating apparatus. However, in reality, no effective measures have been taken to adjust the amount of generated floc derived to increase or decrease as necessary.
[0003]
OBJECT OF THE INVENTION
The object of the present invention is to adjust the amount of floc derived in the granulation dehydration apparatus for granulating and reacting the suspension in one agitation granulation tank to an appropriate amount corresponding to the state of derivation. An object of the present invention is to provide a floc derivation device that can obtain a sufficient effect even in a simple dehydration process using a dehydration bag.
[0004]
[Structure of the invention]
In the floc derivation device in the granulation dehydration apparatus for suspension according to the present invention, the introduction upper end of the suspension feeding pipe introduced from the center of the bottom of the stirring granulation tank is the tank bottom of the stirring granulation tank. The rotating shaft driven by the prime mover is vertically installed at the center of the stirring granulation tank, and a vertical stirring blade that rotates horizontally in the liquid in the stirring granulation tank has an outer periphery of the rotating shaft. A prosthetic body that is opposed to the upper end edge of the suspension feed pipe and has a lower opening larger in diameter than the outer periphery thereof is fixed to the lower end of the rotating shaft; On the outer periphery of the agitator, an inclined stirring blade that is horizontally rotated in the liquid in the stirring granulation tank and twisted in an upward gradient so as to face the rotation direction is stretched, and the vertical stirring blade and the inclined stirring are provided. guide Do the times to close position and along the inner periphery proximity to vessel wall to the vessel wall peripheral surface of the stirring granulation tank between the vanes A movable guide vane, which is pivotally attached to the operation shaft and is adjusted to increase or decrease the separation angle from the inner peripheral surface of the stirring granulation tank, is provided, and a clarified liquid outlet is provided at the upper part of the stirring granulation tank. Established and extended from the concentrating zone near the middle layer in the agitation granulation tank, the communicating pipe led out through the flock derivation opening / closing valve is extended upward, and fitted with the extending part of the communicating pipe to be fixed. The upper edge of the hoisting pipe that is fixed at any hoisting position by the tool becomes an overflow weir, and the tubular flock outlet is led through the overflow weir, changing the fixing position of the hoisting pipe up and down The floc lead-out amount from the flock lead-out port is adjusted to be increased or decreased by adjusting, and the flock lead-out port is opened into the mesh-shaped dewatering bag, and the mesh dewatering bag opening upper edge is formed on the outer periphery of the flock lead-out port Squeeze the part with a string and fit it, The mesh-shaped dewatering bag is hung on a fixed body externally provided in the lead-out device, a large number of ridges are formed below the fitting portion of the mesh-shaped dewatering bag, and the mesh-shaped dewatering bag is suspended below the flock outlet. In addition, a vibrator for giving a vibration of rolling is attached to the mesh-shaped dewatering bag that is suspended.
[0005]
【Example】
Hereinafter, description will be made with reference to the drawings of the embodiments.
[0006]
1 is a stirring granulation tank for treating the suspension, 2 is a suspension feed pipe introduced from the center of the bottom of the stirring granulation tank 1, and the upper end 2e of the introduction is a stirring granulation tank It protrudes higher than the tank bottom surface 1a. 3 is a flocculant injection port established in the middle of the suspension feed pipe 2, and 4 is a rotary shaft vertically provided at the center of the stirring granulation tank 1, and is driven by a prime mover 5 such as a motor. Reference numeral 6 denotes a vertical stirring blade stretched around the outer periphery of the rotary shaft 4 so as to rotate horizontally in the liquid in the stirring granulation tank 1, and has a multi-stage configuration that is orthogonally opposed with an interval in the vertical direction. desirable. Reference numeral 7 denotes a prone body opposed to the upper end edge of the suspension feed pipe 2 and having a lower surface opened to a diameter larger than the outer periphery thereof, and the center portion of the upper surface is fixed to the lower end portion of the rotating shaft 4. . 8 is an inclined stirring blade stretched around the outer periphery of the prone body 7 so as to rotate horizontally in the liquid in the stirring granulation tank 1, and is twisted in an upward gradient so as to oppose the rotation direction thereof. . 9 is an operation shaft guided so as to be close to the inner periphery of the tank wall of the stirring granulation tank 1, and 10 is a vertical shaft which is adjacent to the inner peripheral surface of the tank of the stirring granulation tank 1 and is pivotally supported by the operation shaft 9. Guide blades interposed between the stirring blades 6 and the inclined stirring blades 8 so as to enter the inside of the outer diameters of the two stirring blades 6, 8. It is desirable to have a movable structure that can adjust the separation angle of the tank 1 from the inner peripheral surface of the tank wall. 11 is a sludge interface detection sensor equipped in the agitation granulation tank 1, and 12 is a communication pipe opened from the concentration zone near the middle layer in the agitation granulation tank 1, and includes a flock derivation opening / closing valve 12v. Then, it is extended upward from its secondary side, and a later-described elevating pipe 12b is fitted into the extended portion 12a from above. An upper end portion of the elevating pipe 12b is formed in the flock introduction port 13a, and a fixing tool 21 such as a lock nut is attached to the lower end portion. Reference numeral 13b denotes a cylindrical flock lead-out port that is led back from the flock introduction port 13a, and a portion of the flock introduction port 13a that transitions from the flock introduction port 13a to the flock lead-out port 13b Control the role. The weir height of the overflow weir 20 is adjusted by loosening the fixing tool 21 and moving the hoisting pipe 12b up and down to fasten and fix the fixing tool 21 at an arbitrary lifting position. The flock derivation on-off valve 12v is normally closed, but the timer control at a predetermined cycle time or a predetermined set time after the sludge interface detection sensor 11 detects the granulated sludge interface. Only open. Reference numeral 14 denotes a residual flock discharge port that is branched out from the secondary side of the floc derivation on-off valve 12v in the communication pipe 12, and is opened and closed by operating the attached residual flock discharge on-off valve 14v. 15 is a liquid collecting tank provided on the upper outer peripheral portion of the stirring granulation tank 1, and is cut off from the stirring granulation tank 1, for example, the conduction part 15 a that is connected to the stirring granulation tank 1 through the through hole 15 c for conduction. The non-conducting part 15b is adjacent to the clarified liquid effluent liquid level regulating overflow weir 15d, and the clarified liquid outlet 16 is led out from the bottom of the non-conducting part 15b. The overflow weir 15d is composed of, for example, a combination of a plurality of weir bodies, and is vertically stacked in a multi-stage shape by an insertion structure or the like at the adjacent portion of the conducting portion 15a and the non-conducting portion 15b of the collecting tank 15. By adjusting the weir height t by increasing / decreasing the number of stacked layers, the set value of the liquid level rising limit in the stirring granulation tank 1, that is, the clarified liquid effluent liquid level L can be changed. Reference numeral 17 denotes a mesh-shaped dewatering bag having an upper opening, and the upper edge of the opening is squeezed by the string body 18 and fitted to the outer peripheral surface of the flock outlet 13b so that the string body 18 is hooked on the fixed body. If stopped, the mesh-shaped dewatering bag 17 becomes a purse-like shape in which a large number of ridges 17p are formed in the upper part thereof, and is suspended from the flock outlet 13b. It is also possible to open a plurality of flock outlets 13b in parallel with each other, and fit the mesh-shaped dewatering bags 17... 17 to the outlets 13b. Reference numeral 19 denotes a vibrator for imparting rolling vibration to the suspended mesh-shaped dewatering bag 17, and the mesh-shaped dewatering bag 17 may be directly vibrated, or the support is vibrated and the vibration is meshed. Alternatively, it may be transmitted to the dewatering bag 17.
[0007]
The suspension initially mixed in the suspension feed pipe 2 while adding the flocculant from the flocculant inlet 3 and fed by the introduction upper end 2e of the suspension feed pipe 2 Then, it flows into the prone body 7 and collides with the upper wall, and flows down the annular gap between the inner peripheral wall of the prone body 7 and the outer periphery of the introduction upper end 2e protruding from the tank bottom 1a. When the above-mentioned initially mixed suspension is mixed more uniformly by colliding with the liquid, the upward flow is suppressed while the flow velocity of the inflow is decelerated, and the agitation is performed after the flow velocity is extremely reduced. The blades 8 provide gentle ascending swirl flow agitation, and turbulence is generated in the swirl flow by the guide blades 10 whose angles are adjusted according to the processing conditions. Then, the unreacted microparticles hidden in the suspension are adsorbed and captured by the rotation of the vertical stirring blade 6 provided above the guide blade 10, and a concentration zone is generated near the position where the vertical stirring blade 6 is attached. When the vertical stirring blade 6 is rotated, a rolling action is generated on the floc in the concentration zone to generate a spherical compacted floc, and when the vertical stirring blade 6 has a multi-stage configuration, the same as above. The floc generated by the lower vertical stirring blade 6a fills up the vertical stirring blade 6a and adsorbs and captures unreacted microparticles hidden in the suspension flowing in from the suspension feeding pipe 2. A concentration zone is generated, and then the upper vertical stirring blade 6b effectively rolls against flocs on the surface layer of the concentration zone. When the formed floc layer reaches the detection position of the sludge interface detection sensor 11, the detection signal from the sludge interface detection sensor 11 opens the flock derivation on-off valve 12v for a predetermined set time, and the concentration zone portion near the middle layer A predetermined amount of floc is led out from the overflow weir 20 through the floc lead-out port 13b via the inside of the communication pipe 12 led out of the opening. As another means for opening the flock derivation opening / closing valve 12v, timer control at a predetermined cycle time is also effective. That is, taking into consideration the suspension inflow amount from the suspension feed pipe 2 into the stirring granulation tank 1 and the granulation processing capability in the stirring granulation tank 1, it is necessary until the sludge interface reaches a predetermined level. By setting the timer for calculating the time, the flock derivation on-off valve 12v is opened over time and a predetermined amount of flock is derived from the flock derivation port 13b.
[0008]
This increase / decrease control of the floc derivation amount adjusts the height of the overflow weir 20, that is, adjusts the liquid level difference Δh between the liquid level rise limit L in the stirring granulation tank 1 and the weir height of the overflow weir 20. Is done. The flock derived from the flock outlet 13b is accommodated in the mesh-shaped dewatering bag 17, and the mesh-shaped dewatering bag 17 suspended by adding the weight of the floc is used for tea width squeezing (boiled ingredients used in Japanese cooking). The bag 17p of the mesh-shaped dewatering bag 17 is deepened as in the case of squeezing it with a cloth, and the squeezing effect is produced, and effective dehydration is performed without power coupled with natural gravity dehydration. This will further enhance the dehydration effect. The dehydrated flock may be collected and discarded together with the mesh-shaped dewatering bag 17 or may be transferred to another container for processing. Further, the separated clarified liquid flows into the conducting part 15a of the liquid collecting basin 15 through the conduction through hole 15c, reaches the non-conducting part 15b beyond the upper edge of the overflow weir 15d, Although it is derived from the outlet 16, the clarified liquid effluent liquid level L is determined by the weir height t of the overflow weir 15d, and the clarified liquid effluent liquid level L coincides with the liquid level rise limit in the stirring granulation tank 1. To do. The residual floc is hardened between the end of the floc derivation process in the predetermined time zone and the start of the next floc derivation process, and the secondary side of the floc derivation on-off valve 12v in the communication pipe 12 is closed. In order to avoid this, when the flock derivation on-off valve 12v is closed, the residual flock discharge on-off valve 14v is opened, and the residual flock in the communication pipe 12 is discharged from the residual flock discharge port 14. Desirable [0009]
【The invention's effect】
According to the floc derivation device in the granulation dehydration apparatus that granulates and reacts the suspension in one stirring granulation tank according to the present invention, the derivation amount of the flocs generated in a spherical compaction confirms the derivation status. However, it can be increased or decreased to an appropriate amount corresponding to the progress of work by a simple operation, and there is an advantage that a sufficient effect can be obtained even in a simple dewatering process using a mesh-shaped dewatering bag. Furthermore, there is a secondary effect that dehydration is performed without requiring a large installation space, easy to maintain, inexpensive and low in running cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a main part of the apparatus of the present invention, showing a state in which the height of an overflow weir for regulating the amount of flocs is adjusted to be low.
FIG. 2 is a longitudinal side view of the main part of the device of the present invention, showing a state in which the height of the overflow weir for regulating the amount of floc derived is adjusted high.
3 is a cross-sectional plan view taken along line AA in FIGS. 1 and 2. FIG.
FIG. 4 is a plan view of a stirring granulation tank portion in the apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Granulation stirring tank 1a Tank bottom surface 2 Suspension feed pipe 2e Introducing upper end part 4 Rotating shaft 5 Motor 6 Vertical stirring blade 7 Protruding body 8 Inclined stirring blade 9 Operation shaft 10 Guide blade 12 Communication tube 12a Communication Pipe upper extension 12b Elevating pipe 12v Flock derivation on-off valve 13a Flock introduction port 13b Flock derivation port 16 Clarified liquid outlet 17 Mesh dewatering bag 17P 襞 18 String body 19 Vibrator 20 Overflow weir 21 for regulating flock derivation amount Fixing tool

Claims (3)

The upper end of the introduction of the suspension feeding pipe introduced from the center of the bottom of the stirring granulation tank protrudes higher than the bottom of the stirring granulation tank, and the rotating shaft driven by the prime mover is used for the stirring granulation. A vertical stirring blade that is vertically installed in the center of the tank and horizontally rotates in the liquid in the stirring granulation tank is stretched around the outer periphery of the rotating shaft, and the suspension is fed to the lower end of the rotating shaft. A prone body that is open to the lower surface with a larger diameter than the outer periphery of the tube is fixed, facing the upper edge of the tube, and the outer periphery of the prone body is rotated horizontally in the liquid in the stirring granulation tank. An inclined stirring blade twisted in an upward gradient so as to face the rotation direction is stretched, and the inner peripheral surface of the stirring granulation tank is positioned between the vertical stirring blade and the inclined stirring blade. increasing the separating angle from clothed pivot, bath wall inner peripheral surface of the stirring granulation tank guide please the rotational operation shaft so as to close along the inner periphery proximity to vessel walls A movable guide vane to be adjusted is arranged, and a clarified liquid outlet is opened in the upper part of the agitation granulation tank, and is opened from the concentration zone near the middle layer in the agitation granulation tank. The communicating pipe led out through the valve is extended upward, and the upper edge of the hoisting pipe which is fitted to the extending part of the communicating pipe and is fixed at any lifting position by the fixing tool serves as an overflow weir, A tubular flock outlet is guided through an overflow weir, and the fixed position of the hoist pipe is changed up and down to adjust the amount of floc derived from the flock outlet to be increased or decreased. A floc derivation device in the granulation dehydration device for the suspension.   The floc outlet of the floc outlet in the granulation dehydrator of the suspension according to claim 1 is opened into a mesh-shaped dewatering bag, and the upper edge of the mesh-shaped dewatering bag opening is formed by a string on the outer periphery of the flock outlet. Squeeze and fit, hook the string body to a fixed body externally installed on the flock derivation device, and form a number of ridges below the mesh dewatering bag fitting section to form a purse-shaped bottom flock outlet The floc derivation device in the granulation dehydration device for suspension is characterized in that the mesh dehydration bag is suspended.   3. A suspension for granulating and dewatering a suspension according to claim 2, wherein a vibrator for giving a vibration of rolling is attached to a mesh-shaped dewatering bag suspended below a flock outlet of the flock outlet. A floc derivation device in a granulation and dehydration device for a suspension.

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