JPH0471563B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to sand filtration, activated carbon adsorption, 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, turbidity contained in raw water is captured by the packed bed during the water flow, resulting in increased water flow resistance, so the packed bed needs to be cleaned as appropriate. To clean the packed bed, cleaning air or water and air are ejected from the bottom of the packed bed at the same time to loosen the packed bed and, with fluid agitation, remove the trapped suspended matter and allow it to flow 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 multi-hole pipe cleaning mechanism,
When cleaning is stopped, the filler that forms a packed layer flows into the ejection hole, which tends to at least partially block the perforated pipe and the cleaning fluid introduction main pipe, causing a one-sided flow of cleaning fluid such as air and water, and causing the filling layer to flow. This often made effective cleaning impossible.

The present invention aims to solve the above-mentioned drawbacks of the porous pipe type cleaning mechanism, and has a simple structure, uniformly distributes the cleaning fluid over the entire packed bed, sprays it out, 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 suspended and fixed to 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.

[Effect]

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 through the cleaning fluid at high speed, is evenly distributed and ejected into the packed bed from the jetting holes, and while the entire packed bed is fluidized and agitated, the trapped turbidity is removed, and the removed turbidity is transferred to water. Therefore, it is discharged out of the system, and this cleaning ends after a predetermined period of time has elapsed.

After cleaning the packed bed, water is passed again for water treatment, but by appropriately selecting the particle size of the solid particles filled in the cleaning nozzle, it is possible to It is possible to prevent the inflow of the packed layer forming agent, etc., and to prevent blockage of branch pipes, the main cleaning fluid introduction pipe, etc., and effective cleaning can be performed at any time.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, cleaning air A, cleaning water W
It hangs down and is fixed to the lower part of a plurality of branch pipes 2 branched horizontally from a cleaning fluid introduction main pipe 1 that guides cleaning fluids, and is buried in the bottom of a packed bed formed of filter media and other water treatment fillers. As shown in FIG. 2, the cleaning nozzle 3 consists of a cylindrical body with a threaded part 4 at its upper part that is screwed into the lower part of the branch pipe 2, and solid particles 5 such as gravel, garnet, and plastic particles are contained inside the cleaning nozzle 3. Filled.

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 communication holes 6 are bored with a diameter that does not allow the fixed particles 5 filled inside to pass through, and the solid particles 5 are formed in a packed layer in which the cleaning nozzle 3 is buried. The particle size is selected so as to prevent the inflow of fillers and the like that form the particles.

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, if air A or cleaning water W, or both of them are introduced into the cleaning fluid introduction main pipe 1 at the same time, the cleaning fluid flows into the main pipe 1. The cleaning fluid enters each cleaning nozzle 3 through the pipe 2, flows at high speed between the solid particles 5 filled inside, and is uniformly distributed and ejected from each cleaning fluid distribution hole 6 to the surroundings.
Washing is performed while the packed bed is fluidized and stirred. 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. Also, during this cleaning, air,
Since the cleaning fluid such as water is concentrated on the solid particles 5 in the cleaning nozzle 3 and flows at a high flow rate, 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 main cleaning fluid introduction pipe 1 is stopped, and water is again supplied for water treatment. 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. entrained in the water are blocked from flowing in by the solid particles 5 and are blocked by the filler. No blockages were found in the pipe 2 or the cleaning fluid introduction main pipe 1, and efficient cleaning could always be performed during cleaning.

In addition, if the water passage support plate 7 is provided in the cleaning nozzle 3, it is possible to reliably prevent the solid particles 5 of water from rising.

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, the 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 pipe 1. In this case, the solid particles 5 prevent the entrainment of the packed bed forming material, etc. [Effects of the Invention] As described above, the cleaning nozzle of the present invention has a simple structure and is effective in cleaning the packed bed. Sometimes, the cleaning fluid is evenly distributed and ejected into the packed bed to flow and agitate the entire packed bed for effective cleaning, and to prevent fillers etc. from flowing into the cleaning nozzle while cleaning is stopped. It also prevents blockages in the pipes connected thereto, thereby enabling effective cleaning at all times, and can also be advantageously used for collecting water.

[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. 1... Cleaning fluid introduction main pipe, 2... Branch pipe, 3...
Cleaning nozzle, 4... Threaded portion, 5... Solid particle, 6
...Washing fluid circulation hole, 7...Water passage support plate, A...
Air, W...Washing water.

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 the inside is filled with solid particles and the filling part A nozzle for cleaning a packed bed, characterized in that a plurality of cleaning fluid ejection holes are provided along the .