JPH02149302A - Nozzle for washing packed bed - Google Patents

Abstract

PURPOSE:To always enable effective washing by packing solid particles in the inside of a cylindrical washing nozzle and providing a plurality of ejecting holes for washing fluid along the packed part in the cylindrical washing nozzle buried in the lower part of the inside of the packed bed. CONSTITUTION:The cylindrical washing nozzles 3 are vertically fixed to the lower parts of the branch pipes 2 horizontally branched from a washing fluid introducing main pipe 1 and buried in the lower part of the inside of a packed bed. Solid particles 5 are packed to the insides of the washing nozzles 3 and also a plurality of ejecting holes 6 for washing fluid are provided along the packed parts. As a result, washing fluid is uniformly distributed and ejected to the whole body of the packed bed and inflow of a material forming the packed bed is inhibited and thereby effective washing is always enabled.

Description

[Detailed description of the invention] [Industrial application field] The present invention is sand filtration, activated carbon adsorption, and ion exchange.

The present invention relates to a cleaning nozzle for cleaning packed beds used in other water treatments.

[Conventional technology]

In water treatment in which water is passed through various types of packed beds, turbid bones contained in raw water are captured in the packed beds during water passing, resulting in increased water flow resistance, so it is necessary to wash the packed beds as appropriate. To clean the packed bed, cleaning air, water, or water and air are ejected from the bottom of the packed bed at the same time, loosening the packed bed, and dislodging the trapped turbid bone while agitating the bed and draining it out of the system. However, in order to spray cleaning fluid uniformly, a perforated pipe type cleaning mechanism in which a plurality of perforated pipes are branched horizontally from a main cleaning fluid introduction pipe is often used.

[Problem to be solved by the invention]

However, in the conventional perforated pipe type cleaning mechanism, when cleaning is stopped, filler material that forms a packed layer flows into the ejection hole, and the perforated pipe and the main cleaning fluid introduction pipe are likely to be at least partially blocked. This causes a one-sided flow in the cleaning fluid such as
This often made effective cleaning of the packed bed impossible.

The present invention aims to solve the above-mentioned drawbacks of the porous pipe type cleaning mechanism, and has a structure aS that uniformly distributes and jets out the cleaning fluid over the entire packed bed and prevents the inflow of the packed bed forming material, etc. The object of the present invention is to provide a cleaning nozzle that enables effective cleaning at all times.

[Means to solve the problem]

The present invention relates to a cylindrical cleaning nozzle which is fixedly suspended from the lower part of a plurality of branch pipes branched horizontally from a main cleaning fluid introduction pipe and is buried in the lower part of a packed bed, and which is filled with solid particles and This nozzle for cleaning a packed bed is characterized in that a plurality of cleaning fluid ejection holes are provided along the filling part.

[For production]

When cleaning a packed bed, when the cleaning fluid air, water, or a combination of these is introduced into the main cleaning fluid introduction pipe, the cleaning fluid passes through the branch pipes to the cleaning nozzle, and passes between the solid particles filled inside. The cleaning fluid flows at high speed and is evenly distributed and ejected into the packed bed from the jet holes, and the trapped turbid bone is peeled off while flowing and stirring the entire packed bed, and the separated turbid bone is removed by water. The cleaning is completed after a predetermined period of time has elapsed.

After cleaning the packed bed, water is passed through again for water treatment, but by appropriately selecting the particle size of the solid particles to be filled in the cleaning nozzle, filling from the cleaning fluid jet hole of the cleaning nozzle can be controlled. It is possible to prevent the layer-forming material from flowing away, to prevent blockage of branch pipes, the main cleaning fluid introduction pipe, etc., and to perform effective cleaning at any time.

〔Example〕

One embodiment of the present invention will be described with reference to the drawings.
As shown in the figure, it is suspended and fixed at the bottom of multiple branch pipes 2 branched horizontally from a main cleaning fluid introduction pipe 1 that guides cleaning fluids such as cleaning air A and cleaning water, and is used for water treatment such as filter media. The cleaning nozzle 3, which is buried in the bottom of the packed bed formed by the filling layer, is made of a cylindrical body with a threaded part 4 screwed into the lower part of the branch pipe 2 at the top, as shown in No. 2M. is filled with solid particles 5 such as gravel, garnet and 7 toplastin particles.

In addition, an appropriate number of cleaning fluid circulation holes 6 are formed in the bottom of the cleaning nozzle 3, and an appropriate number of cleaning fluid circulation holes 6 are also formed in the side surface below the height of the solid particle filling part 5. has been done. Further, these cleaning fluid circulation holes 6 are formed with a diameter that does not allow the solid particles 5 filled inside to pass through, so that the solid particles 5 and the groups of particles 5 can pass through the packed bed in which the cleaning nozzle 3 is buried. The particle size is selected so as to prevent the inflow of the filler material etc. to be formed.

As shown in the second illustrated example, it is also preferable that a water-permeable supporting plate 7 is installed in the cleaning nozzle 3 to prevent the solid particles 5 from rising and flowing out due to backflow of water. It is.

The cleaning nozzle 3 is buried in the bottom of the packed bed, and when cleaning the packed bed, the cleaning fluid is air A or cleaning water W.
, or if both of these are simultaneously introduced into the main cleaning fluid introduction pipe 1, the cleaning fluid enters each cleaning nozzle 3 via the branch pipe 2, flows at high speed between the solid particles 5 filled inside, and each The cleaning fluid is uniformly distributed and ejected from the cleaning fluid distribution holes 6 to the surrounding area, and cleaning is performed while fluidly stirring the packed bed. At this time, when air or a combination of air and water is used as the cleaning fluid, the air is mainly ejected from the upper cleaning fluid distribution hole 6. Furthermore, during this cleaning, the cleaning fluid such as air or water concentrates on the solid particles 5 in the cleaning nozzle 3 and flows at a high flow rate, so that contamination of the solid particles 5 is prevented.

After the cleaning of the packed bed is completed, the introduction of the cleaning fluid into the cleaning fluid introduction main pipe 1 is stopped, and water flow for water treatment is performed again. At that time, water may flow back into the cleaning nozzle 3 from the cleaning fluid flow hole 6 of the cleaning nozzle 3, but the filler etc. that are accompanied by the water are blocked from flowing in by the solid particles 5, and the branch pipe 2 due to the filler No blockage was observed in the cleaning fluid introduction main pipe 1, and efficient cleaning can always be performed during cleaning.

Note that if the water flow support plate 7 is provided in the cleaning nozzle 3, it is possible to reliably prevent the solid particles 5 from rising due to backflow of water.

Further, the cleaning nozzle 3 can be used not only for cleaning but also for collecting water. That is, when water is passed through for water treatment, treated water that has passed through the packed bed flows into the cleaning nozzle 3 from the cleaning fluid distribution hole 6 and is taken out through the branch pipe 2 and the cleaning fluid introduction main pipe 1. In this case, the solid particles 5 prevent the packed bed forming material from being entrained.

〔Effect of the invention〕

As described above, the cleaning nozzle of the present invention has a simple structure, and when cleaning a packed bed, the cleaning fluid is uniformly distributed and ejected into the packed bed, and the entire packed bed is fluidized and agitated. It prevents filler materials from flowing into the cleaning nozzle while cleaning is stopped, prevents blockages in the cleaning nozzle and the pipes connected to it, and enables effective cleaning at all times.It can also be used for collecting water. It can be advantageously used for both purposes.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a partial perspective view showing an attached state, and FIG. 2 being a longitudinal sectional view of the cleaning nozzle. DESCRIPTION OF SYMBOLS 1... Main cleaning fluid introduction pipe, 2... Branch pipe, 3... Cleaning nozzle, 4... Threaded part, 5... Solid particle, 6...
- Cleaning fluid distribution hole, 7...Water flow support plate, A...Air, W...Washing water. Ku

Claims (1)

[Claims] (1) A cylindrical cleaning nozzle that is fixedly suspended from the lower part of a plurality of branch pipes branched horizontally from the main cleaning fluid introduction pipe and is buried in the lower part of the packed bed, and is used to fill the inside with solid particles and to A nozzle for cleaning a packed bed, characterized in that a plurality of cleaning fluid ejection holes are provided along a filling part.