JPS5942013A - Backwashing device of cylindrical element type filter - Google Patents

Abstract

PURPOSE:To enable a titled device to backwash effectively with a small amount of water, by piercing holes in the wall of a water introducing pipe of each filtering element to form a liquid, flowing in the pipe, into a water-air mixed flow. CONSTITUTION:In backwashing a cylindrical element type filter, a valve V1 of washing water is opened to fill the inside of a housing 5 at the filtrate side with water 7. Next, after closing the valve V1, when a back-washing gas valve V2 is opened to supply a pressurized air, the water 7 flows from the inside of each filter element 1 to its outside through each water introducing pipe 6 to backwash the elements 1 by the action of the gas. At that time, as small holes 8 pierced in each pipe 6 wall catch up air into the water by the action of a water flow pump, washing is performed by the produced water-air mixed flow. Accordingly, the washing is effectively performed by the produced high-speed water flow without causing an uneven washing, and the cake deposited on the surfaces of the elements 1 and the particles captured between the metallic wires of elements 1 are removed.

Description

Detailed Description of the Invention 11 Cylindrical element type filter backwashing device 77 according to the present invention
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Cylindrical element type filters have a method that uses 11 filtration elements, but for example, crude oil is filtered between the gold-plated A wires of the freezing and filtering elements, which are made by winding gold-plated wire at regular intervals on a perforated metal tube. 21・11'',) A filter that extracts the filtrate into the 7-hole Jinmaki tube is in practical use.
The figure is a front view showing the configuration of this type of filter, in which a tube plate 2 in which a large number of filter elements 1 are installed, il:li
By installing the device in the tank 3, it is partitioned into a housing 4 and a housing 5. Each γ, Ki! The filter element 1 passes through the pipe 4) through 2 holes I7; 4 holes are brought out into the liquid side element b, thereby forming a water conduit 6. Figure 1 shows the state in which the filter element 1 with its upper end sealed is placed in the filter tank 6 with the device d facing upward, and Figure 2 shows the state in which the filter element 1 with its upper end sealed is placed in the filter tank 6, and the upper and lower parts ψ1 and 14 are placed on the dirt floor.
i1 stop, i+! , which shows the state in which the filtration element 1 having the Li liquid number outlet 9 is installed facing downward.瀘print tj4,
The stock solution is sent from the stock solution side housing 4 through the filtration element 1 to the filtrate (III housing 5). As a result, the filtration pressure gradually increases.It is desirable to keep the filtration pressure below a certain level in order to carry out filtration in one millimeter space. It is necessary to periodically wash and remove the solid particles or cake deposited on the surface.This washing is done by opening the washing water pulp V1 and straining the water 7 into the Ujifugu 5 on the il+W liquid side. When the wash water valve 1 is closed, the backwash gas pulp V2 is opened and pressurized gas is sent.
A so-called backwash is performed by instantaneously washing the product toward the surface. Backwashing here refers to the removal of the cake deposited on the surface of the filtration element 10 and the removal of trapped particles between the metal wires of the filtration element.

However, in the conventional cylindrical element type filler backwashing device, V, j2, and washing water 7 are not evenly distributed to the filtered tube plate 1], and in FIG.
In the figure, the water was concentrated in the end region of the filter element far from tube &2, requiring a large amount of water to thoroughly clean it. This tendency was particularly strong in the case of long filtration elements. This is the external tank 1 as shown in Figure 5.
Introducing wash water 7 for backwashing from 0/1. The same applies to the method in which the water is introduced into each filtration element 1 via J6.

Therefore, in the present invention, a small hole 8 is bored in the water conduit B so that the fluid flowing through the 1l-1 filtration element is not only water but a mixture of water and air.

By configuring in this way, the filtrate side...Ujifugu 5
Water 7 in the inner or outer tank 10 flows from the inside of the element 1 to the outside through the water conduit 6 under the action of the pressurized gas for backwashing. Since the small hole 8 bored in the water pipe draws in air by the action of the water flow, the washing water will operate with a large amount of air bubbles mixed into it.

One of the flow modes in the pipe and the two-phase flow in air (1-) have been widely known in the past, but in the present invention, it is A water-air mixing flow is created [2, this water-air mixing flow is supplied to the JL flow path by a large lifting machine.
Since 4 is small in the childbirth ratio and the resistance from the flow path is small, it flows uniformly to the filtration/ment (19), so it is difficult to cause ti+;Ip bugs.
It is effective with less woodwork compared to the conventional equipment, as it repeatedly applies shock to the solid particles that cause stray gels and clog the D/J protrusion element. cleaning can be performed.

In particular, since the discharged cake is regulated as industrial waste, it is necessary to discharge it in a state in which Ay has been removed.

Because of this, /C is usually deposited on the surface of the striking element.
KEK V1 Before removing and discharging in that state, -1]
Pressurized gas is pumped into the hot pot tank to remove liquid. In the conventional washing method using only water, a large amount of water M is consumed, resulting in a problem in the water content of the drained cake, which is difficult to dispose of.However, in the present invention, the water content of the drained cake is extremely low. It is possible to try to solve the problem at the same time.

The diameter of the hole to be drilled in the T# water pipe is approximately 1 m (1 m) for an inner diameter of 1Q NJA water pipe, which yields good results. iTasono place 1
11' is better to be below the liquid level when filled with water, but depending on the pressure of the pressurized gas for backwashing, the inner diameter of the pipe, and the hole diameter,
It is not always necessary to keep l~ below the liquid level.

As described above, the inverse %I' of the cylindrical element type filter of the present invention,
The device 1 can effectively clean the filtration element, and the present invention greatly contributes to the t!ji industry.

[Brief explanation of the drawing]

Edict 1 Figure 0) is a front view showing the configuration of the device of the present invention, and Figure 1 (B) is an expanded body of the same main part. ) I+, figure. Figures 2 and 6
The figure is a front view showing another example of the present invention. 1...Filtering element, 2...Pipe IQ, 5...Filtration tank, 4...Crude oil side housing, 5...n□1
．． 1 'Hy i-law housing, 6... Water pipe, 7.
...Washing water, 8..Small hole. Vl...Washing water pulp, ■2...Backwashing air pulp. Applicant Tokyo Special Electric Wire Co., Ltd. Representative Tsugu Kogure d (7.) Figure 1 (A) Figure 1 Naka) Figure 2: (Figure 1)

Claims (1)

[Claims] In the filtration tank 5 of the cylindrical element type filter, 1 and 2 are provided to separate the raw solution side housing 4 and the filtrate side housing 5, and a large number of σ, 3 filtration elements 1 are installed on the tube plate 2. Then, water 7 is sent to each filtration element 1 through 4.1 water 1 and t6 under the action of pressurized gas for backwashing, using a backwashing device to wash the filter element...
Flow the water inside the water pipe 6゛? 11. A small hole 8 was drilled in the body to make the water-air mixed phase b;1.
Backwashing AA of cylindrical element type filter with +fot
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