JP2007253020A - Screen sludge washing apparatus and screen sludge washing method using this apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen sludge washing apparatus which can control tangling of residue and carry out washing uniformly and effectively, while generating high-speed revolution flow, and also control residence of the screen sludge in a screen sludge washing tank, when a high-concentration screen sludge, which is scratched up by a dusting machine, is stored in the tank, is circulation transported by a screen-sludge transportation pump and returned to the screen sludge washing tank. <P>SOLUTION: A return screen sludge from the screen sludge transportation pump 6 is tangentially supplied from a circulation water inlet 14, which is formed at the peripheral part of a side wall of the screen sludge washing tank 1, into the tank, and also a plurality of washing nozzles 2 are arranged at the angle where revolution flow generates in the tank by injection of washing water, in the screen sludge washing tank 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a screen residue cleaning device and a screen residue cleaning method using this device, and in particular, selectively pumping high concentration screen residue removed from a dust remover and put into a screen residue cleaning tank. A screen residue cleaning device that returns to the screen residue washing tank and circulates and agitates to efficiently and uniformly perform cleaning in a short time, and to clean and transfer the screen residue with a single pump. The present invention relates to a screen residue cleaning method using this apparatus.

Conventionally, as a cleaning device for the screen residue and sand settling removed from the dust remover, a cleaning device such as a flight conveyor, an impeller stirring type, an air stirring type, or a double barrel type has been proposed.
In addition, belt conveyors, flight conveyors, skip hoists, corrugated side conveyors, and the like have been proposed as conveying devices.

  By the way, the devices for cleaning and transferring the screen residue are used in combination with a cleaning device and a carry-out device, which are different technologies, so that a large installation space is required in the treatment plant and is maintained separately. In addition to management, there was a problem that equipment costs and maintenance costs were high.

  In order to solve this problem, the applicant of the present invention has a valve in the middle of the screen residue transfer pipe in a screen residue cleaning and transferring device that temporarily stores it in the screen residue storage tank and transfers it to the screen residue separator by the screen residue transfer pump. The screen residue transferred by the screen residue transfer pump is circulated by switching the valve and returning to the screen residue storage tank, and washing is performed by stirring. Has been developed to transfer a screen residue to a screen residue separator (see Patent Document 1).

This screen residue cleaning device is suitable for cleaning normal screen residue, but in high concentration screen residue with a screen residue concentration of 3% or higher, the screen residue transfer pump is clogged or high concentration. Because there is a limit to the screen residue transfer speed due to, it is not possible to increase the flow rate in the screen residue cleaning tank. Therefore, it is not possible to perform efficient and uniform cleaning in a short time, and further, the cleaning tank after cleaning. Further, when the screen residue is discharged, there is a problem that it easily adheres to the inner surface of the cleaning tank, particularly near the screen residue discharge port due to its viscosity.
JP 2005-279532 A

  In view of the problems of the screen residue cleaning device, the present invention stores the high-concentration screen residue that has been lifted up by a dust remover in a screen residue cleaning tank, and circulates and transfers it by a screen residue transfer pump. A screen residue cleaning device that generates a high-speed swirling flow when returning to the tank, suppresses entanglement of residue and efficiently performs uniform cleaning, and also prevents residual screen residue in the tank, and this device An object of the present invention is to provide a method for cleaning a screen residue using the above.

  In order to achieve the above object, the screen residue cleaning apparatus of the present invention temporarily stores the screen residue that has been lifted up by a dust remover or the like in a screen residue cleaning tank and transfers it to the screen residue separator using a screen residue transfer pump. In the screen residue cleaning device, which is designed to wash the screen residue by circulating it back to the screen residue cleaning tank by switching the switching valve, the return screen residue from the screen residue transfer pump is tangent to the outer periphery of the side wall of the screen residue cleaning tank. In addition to supplying from the direction, a plurality of cleaning nozzles are disposed at an angle at which a swirling flow is generated in the tank by jetting cleaning water in the screen residue cleaning tank.

  In this case, the screen residue cleaning tank is elliptical, and the screen residue discharge port can be formed at a low position on the inclined tank bottom.

  The screen residue transfer pump can be a jet pump type.

  In addition, the cleaning nozzle can be disposed in water.

  In addition, a multi-axis rotating disk type overflow screen having a nozzle for cleaning the screen can be disposed in the overflow portion of the screen residue cleaning tank.

  Further, a tank inner surface cleaning nozzle for cleaning the inner surface of the screen residue cleaning tank can be provided.

  Further, the screen residue cleaning method of the present invention is a screen residue cleaning method using the above-mentioned screen residue cleaning device, and the screen residue is cleaned by a swirling flow in the tank, and the washing water is jetted from the cleaning nozzle. It is characterized by the fact that it is carried out by the cleaning action by the above and the cleaning action by the transfer flow in the circulation pipe.

  According to the screen residue cleaning apparatus of the present invention, when the screen residue scraped up by a dust remover or the like is temporarily stored in the screen residue cleaning tank and transferred to the screen residue separator by the screen residue transfer pump, the switching valve is switched. In the screen residue cleaning device in which the screen residue is cleaned by circulation back to the screen residue cleaning tank, the return screen residue from the screen residue transfer pump is supplied from the tangential direction of the outer periphery of the side wall of the screen residue cleaning tank. In addition, a plurality of cleaning nozzles are arranged at an angle at which a swirling flow is generated in the tank by spraying the cleaning water into the screen residue cleaning tank, so that the transferred screen residue is transferred to the screen residue cleaning tank on the outer periphery of the side wall. Because of the return from the tangential direction of the water, there is a synergistic effect between the generated stirring flow in the tank and the water surface generated by the jet from the upper washing nozzle and the turbulent flow in the water As a result, a swirling flow with a higher flow velocity is generated in the tank, and the high-concentration screen residue can be unraveled and efficiently cleaned in a short time. Even when discharging and transferring from the inside of the tank later, the screen residue is prevented from being entangled again by the action of generating a swirling flow by spraying the washing water toward the center where the flow tends to stay. Uniform cleaning can be performed efficiently.

  In addition, the screen residue cleaning tank has an elliptical shape, and a screen residue discharge port is formed at a low position on the inclined tank bottom so that the return screen residue flow supplied from the tangential direction of the outer periphery of the side wall of the screen residue cleaning tank. It is easy to obtain a high flow rate as a swirling flow, reliably circulate and discharge the screen residue, and reduce transfer leakage so that it can be hygienic.

  In addition, by adopting a jet pump type screen residue transfer pump, the pressure of the driving water supplied to the pump can be adjusted reliably without causing clogging of the pump even if the concentration is high. be able to.

  In addition, by disposing the cleaning nozzle in water, the screen residue can be more efficiently cleaned by the cleaning action by the bubbles contained in the cleaning water from the cleaning nozzle.

  In addition, by installing a multi-shaft rotating disk type overflow screen equipped with a nozzle for cleaning the screen in the overflow part of the screen residue cleaning tank, it is possible to prevent tangling of the screen residue in the overflow screen part. Wash water can be overflowed.

  In addition, by providing a tank inner surface cleaning nozzle that cleans the inner surface of the screen residue cleaning tank, the screen residue can be transferred to the inner surface of the tank either during circulation stirring and washing of the screen residue or after discharging the screen residue after cleaning. Therefore, it is possible to reliably perform cleaning and discharging.

  Further, according to the screen residue cleaning method of the present invention, the screen residue is cleaned by a swirling flow in the tank, a cleaning operation by jetting cleaning water from the cleaning nozzle, and a cleaning operation by a transfer flow in the circulation pipe. By doing so, uniform cleaning of the screen residue can be performed efficiently.

  Embodiments of a screen residue cleaning apparatus and a screen residue cleaning method using the apparatus will be described below with reference to the drawings.

  1 to 3 show an embodiment of a screen residue cleaning apparatus of the present invention and a screen residue cleaning method using this apparatus.

  The screen residue cleaning apparatus of the present invention includes a screen residue cleaning tank 1 for temporarily storing and cleaning the screen residue scraped up by a dust remover and the like, and the screen residue is separated from the screen residue cleaning tank 1 Transfer and circulation agitation by switching the switching valve 7 so that the screen residue transfer pump 6 is transferred to the machine 9, and the screen residue transfer pump 6 is transferred to the screen residue separator 9 or returned to the screen residue washing tank 1 for circulation. The driving water pipe 8 is configured to selectively perform cleaning.

  The screen residue cleaning tank 1 has a screen residue input port 11 for supplying (supplying) the screen residue that has been scraped by a dust remover or the like to a part of the upper surface thereof, with the tank bottom surface 12 inclined, Although not limited, for example, as shown in the figure, the screen residue discharge port 13 is provided at the center of the tank, and the return screen residue (circulated water) is supplied from the screen residue transfer pump in the tangential direction of the outer periphery of the side wall. Each of the water inlets 14 is formed, and a cleaning nozzle 2 and a tank inner surface cleaning nozzle 3 for helping the cleaning of the screen residue by generating a swirling flow in the tank by the injection of the cleaning water at the upper part of the screen residue cleaning tank. Arrange and configure.

In this case, the screen residue cleaning tank 1 is formed so that the planar shape is circular or elliptical.
When the planar shape of the screen residue cleaning tank 1 is formed in a circular shape, the flow velocity of the generated swirling flow is difficult to decrease, but the stirring action by the swirling flow is difficult to obtain.
On the other hand, when the planar shape of the screen residue cleaning tank 1 is formed in an elliptical shape, the flow velocity of the generated swirling flow is likely to decrease, but the stirring action by the swirling flow is easily obtained. When the planar shape of the screen residue cleaning tank 1 is elliptical, the aspect ratio (D1 / D2) is 1.1 to 1.2 as shown in FIG. Is desirable.
Further, for example, when the flow rate at the central portion of the screen residue cleaning tank 1 is reduced by forming the screen residue discharge port 13 on the outer peripheral portion of the screen residue cleaning tank 1, the washing is performed at the central portion of the tank where the flow rate is low. Incomplete screen residue will stay. In order to prevent this, as shown in FIG. 4 (b), a rectifier 17 having a shape substantially similar to that of the screen residue cleaning tank 1 is installed at the center of the screen residue cleaning tank 1. As a result, the entire flow rate of the screen residue cleaning tank 1 can be made uniform, and the screen residue that has not been completely cleaned can be prevented from staying.
The tank shape (volume) of the screen residue cleaning tank 1 is set according to the screen residue processing amount (input amount). For example, the screen residue processing amount (input amount) is 0.5 m ^3. In this case, the tank volume is set to 3 m ³ and the water depth is set to about 700 mm.

As shown in FIG. 1, the cleaning nozzle 2 is located at an upper position of the screen residue cleaning tank 1, more specifically, at a position on the surface of the cleaning water supplied up to a predetermined water level in the screen residue cleaning tank 1. A swirling flow is generated in the tank by the washing water jet, and a plurality of flow streams are arranged at an attachment angle toward the central portion. The mixture is crushed and stirred in the generated swirling flow, and the washing water including the screen residue is directed toward the center of the tank. The mounting pitch of the cleaning nozzle 2 and the supply amount of cleaning water are not particularly limited, but are, for example, within 1000 mm and 0.03 m ³ / min / 1.
The cleaning nozzle 2 is connected to a pipe (not shown) for supplying cleaning water.

  In addition, a plurality of tank inner surface cleaning nozzles 3 are arranged at a predetermined interval at the upper position of the screen residue cleaning tank as in the case of the cleaning nozzle 2. This is for cleaning the peripheral surface, whereby the screen residue adhering to the inner surface of the tank can be washed away.

In addition, an overflow portion 15 is formed in a part of the screen residue cleaning tank 1 to allow the cleaning water to overflow. The overflow screen 4 is disposed in the overflow section 15, and the overflow screen 4 includes screen cleaning nozzles 51 and 52 on the front surface portion and the rear surface portion, respectively. The overflow screen 4 is not particularly limited, but can be, for example, a multi-axis rotating disk type.
The multi-axis rotating disk type overflow screen 4 is not limited to a plurality of disks on a single axis, and is not particularly limited. For example, the distance between the disks is 5 mm (mesh width 5 mm). Are arranged in the overflow section 15 of the screen residue washing tank so that a part of the disk overlaps each other, and a predetermined number is driven by the drive unit 41. It is configured to rotate at a rotational speed of.
Thereby, when the washing water in the screen residue washing tank is allowed to overflow, the screen residue can be captured and removed, and only the washing water can be caused to overflow. At this time, the clogging is prevented by the rotation of the overflow screen 4.

  Further, two methods are conceivable for preventing the screen residue from being entangled with the overflow screen. One is a method of arranging the screen cleaning nozzles 51 and 52 on the front side and the rear side of the overflow screen 4 as described above, and the other method is omitted in the figure, but a gap is prevented at the bottom of the screen. A plate is provided, and the gap prevention plate is matched to the shape of the multiple disk, the height direction is made to be a stepped shape and matched to the upper surface of the disk, and the horizontal direction is made to be a shape along the disk so that the gap is zero. It is a method to do.

A screen residue transfer pump 6 is disposed at the screen residue discharge port 13 of the screen residue cleaning tank. The screen residue transfer pump 6 is a jet pump type.
This jet-pump type screen residue transfer pump 6 is attached to the bottom lower surface of the screen residue cleaning tank so that the screen residue is sucked and supplied from the screen residue discharge port 13 of the tank. Comprises a drive water inlet 61 for supplying high-pressure drive water, and a discharge port 62 on the side surface facing this.
As a result, when being supplied into the screen residue transfer pump from the drive water inlet 61 and discharged from the discharge port 62, the inside of the screen residue transfer pump housing becomes negative pressure due to the high pressure drive water, and thereby the screen residue discharge of the tank is discharged. The screen residue is easily sucked from the outlet 13, and is mixed and stirred with high-pressure drive water in the housing, so that the screen residue is washed while being crushed.

Next, the operation of this screen residue cleaning device will be described.
The screen residue scraped up by a dust remover or the like is put into the screen residue cleaning tank 1. At this time, the cleaning water is supplied to the screen residue cleaning tank 1 up to a predetermined level, and the return screen residue discharged from the screen residue transfer pump 6 by the switching valve 7 provided in the drive water pipe 8. When the (circulated water) is switched back to the screen residue cleaning tank, the high-pressure drive water supplied to the screen residue transfer pump 6 is discharged from the discharge port 62, and the circulation pipe 81 of the drive water pipe 8 is connected. Then, it returns to the screen residue washing tank 1 from the circulating water inlet 14, and a swirling flow is generated in the screen residue washing tank 1 using this water pressure.

  When the screen residue transfer pump 6 is driven by driving water, the screen residue in the tank is sucked into the screen residue transfer pump 6 from the screen residue discharge port 13 and stirred and crushed by a high drive water pressure. As described above, the screen residue is cleaned by circulating at least once from the screen residue cleaning tank 1 through the screen residue transfer pump 6 and the circulation pipe 81 so as to return to the screen residue cleaning tank 1 again. A strong swirl flow is generated in the cleaning tank 1 by the synergistic effect of the circulating water pressure introduced from the tangential direction and the spray cleaning water from the cleaning nozzle 2. In addition, a swirling flow is generated by the jet cleaning water pressure from the cleaning nozzle 2, and the screen residue on the surface of the water is crushed and stirred, and the swirling flow is directed toward the center of the tank so that the entire tank is cleaned. Can be performed uniformly, and the cleaning effect is improved.

In addition, when the screen residue is circulated and washed, the excess washing water flows from the inside of the screen residue washing tank 1 through the rotating overflow screen 4 of the overflow section 15 and drains out of the tank through the drain port 16, The screen residue is filtered by the overflow screen 4 and returned to the screen residue washing tank 1 again.
The screen residue captured by the overflow screen 4 and attached to the overflow screen 4 is rotated by the rotation of the overflow screen 4 and from the screen cleaning nozzles 51 and 52 disposed on the front and rear surfaces of the screen. Clogging of the overflow screen 4 is prevented by the washing water jet, and the washing water overflows and drains continuously.

  In this way, when the required cleaning is completed, the switching valve 7 is then switched and connected to the screen residue transfer pump 6 and the transfer piping 82 of the driving water piping 8, so that the screen residue and the circulating water after cleaning are screened. The residue is transferred from the residue washing tank 1 to the screen residue separator 9 via the screen residue transfer pump 6 and the transfer pipe 82, where the screen residue after washing and the washing water are separated, and the screen residue is dehydrated and discarded or incinerated. To.

  When cleaning the screen residue cleaning tank 1 and the screen residue transfer pump 6, the drive water is passed through the backwash pipe 83 of the drive water pipe 8 by switching the switching valve 7 and the backwash valve 10. In addition, the screen residue adhering to the inside of the tank can be washed away by spraying the cleaning water from the tank inner surface cleaning nozzle 3.

As a result, a swirling flow is generated by the jet cleaning water pressure from the cleaning nozzle 2 even in the vicinity of the center of the tank where the swirling flow speed is usually slow, and a water flow toward the center is generated. By collecting the screen residue from the central part, it is possible to prevent uncleaning near the center of the tank where the flow rate is slow and increase the swirling flow, so that the cleaning efficiency can be improved.
Thus, according to the screen residue cleaning method by this screen residue cleaning device, the screen residue is cleaned by the swirling flow in the screen residue cleaning tank 1, the cleaning operation by the injection of the cleaning water from the cleaning nozzle 2, and By performing the cleaning action by the transfer flow in the circulation pipe 81, uniform cleaning of the screen residue can be performed efficiently.
And even for high-concentration screen residue with a screen residue concentration of 3% or more, the cleaning efficiency is improved, so the cleaning time can be set short, there is no variation in the cleaning rate, and the screen residue remaining in the tank can be suppressed. .

By the way, in the screen residue cleaning apparatus of the above embodiment, the cleaning nozzle 2 is disposed on the surface of the cleaning water supplied up to a predetermined water level in the screen residue cleaning tank 1. It is also possible to arrange 2 so as to be located in water.
Thereby, for example, air mixed when pumping by the jet pump type screen residue transfer pump 6 becomes a bubble when it is discharged as a swirling flow into the tank by jetting of the cleaning water, and the screen is cleaned by the cleaning action of the bubble. The residue can be washed more efficiently.
In this case, in order to effectively obtain the bubble cleaning action, (1) the cleaning nozzle 2 is disposed at a position where the bubbles do not defoam, and (2) the swirling flow in the screen residue cleaning tank 1 The flow rate is an appropriate flow rate, and is not particularly limited. For example, the flow rate at the outer peripheral portion in the tank is about 0.5 to 1 m / s or more, and the flow rate at the center is about 0.2 m / s or more. It is necessary to make it.

  As described above, the screen residue cleaning apparatus of the present invention and the screen residue cleaning method using this apparatus have been described based on a plurality of examples, but the present invention is not limited to the configuration described in the above examples, The configuration can be changed as appropriate without departing from the spirit of the invention.

  The screen residue cleaning apparatus of the present invention and the screen residue cleaning method using this apparatus store the high-concentration screen residue that has been lifted up by a dust remover in a screen residue cleaning tank and circulate and transfer it with a screen residue transfer pump. When returning to the screen residue cleaning tank, a high-speed swirling flow is generated, tangling of the residue is suppressed, uniform cleaning can be performed efficiently, and residual screen residue in the tank can also be suppressed. % Or more can be suitably used for cleaning high-concentration screen residue.

It is a top view which shows one Example of the screen residue washing | cleaning apparatus of this invention. It is the same front longitudinal cross-sectional view. It is explanatory drawing of a screen residue washing | cleaning process. A screen residue washing tank is shown, (a) is an explanatory view at the time of making a plane shape into an ellipse, and (b) is an explanatory view at the time of installing a rectifier.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen residue washing tank 11 Screen residue input port 12 Bottom surface of screen residue washing tank 13 Screen residue discharge port 14 Circulating water inlet 15 Overflow part of screen residue washing tank 2 Cleaning nozzle 3 Tank inner surface cleaning nozzle 4 Overflow screen 41 Drive Machine 51 Screen cleaning nozzle 52 Screen cleaning nozzle 6 Screen residue transfer pump 61 Drive water inlet 62 Discharge port 7 Switching valve 8 Drive water piping 81 Circulation piping 82 Transfer piping 83 Backwash piping 9 Screen residue separator 10 Backwash valve

Claims (7)

  When the screen residue scraped up by a dust remover is temporarily stored in the screen residue cleaning tank and transferred to the screen residue separator by the screen residue transfer pump, the screen is circulated back to the screen residue cleaning tank by switching the switching valve. In the screen residue cleaning device designed to clean the residue, the return screen residue from the screen residue transfer pump is supplied from the tangential direction of the outer periphery of the side wall of the screen residue cleaning tank, and the screen residue cleaning tank is washed with water. A screen residue cleaning apparatus, wherein a plurality of cleaning nozzles are arranged at an angle at which a swirling flow is generated in the tank by spraying of the water.   2. The screen residue cleaning apparatus according to claim 1, wherein the screen residue cleaning tank has an elliptical shape and a screen residue discharge port is formed at a lower position of the inclined tank bottom.   3. The screen residue cleaning apparatus according to claim 1, wherein the screen residue transfer pump is a jet pump type.   4. The screen residue cleaning apparatus according to claim 1, wherein the cleaning nozzle is disposed in water.   5. A screen residue cleaning apparatus according to claim 1, wherein a multi-axis rotating disk type overflow screen having a nozzle for screen cleaning is disposed in the overflow portion of the screen residue cleaning tank. .   6. The screen residue cleaning device according to claim 1, further comprising a tank inner surface cleaning nozzle for cleaning the inner surface of the screen residue cleaning tank.   7. A screen residue cleaning method using the screen residue cleaning device according to claim 1, wherein the screen residue is cleaned by a swirling flow in a tank and from a cleaning nozzle. A screen residue cleaning method characterized by performing a cleaning action by water injection and a cleaning action by a transfer flow in a circulation pipe.

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