KR100701395B1 - Apparatus and method for cleaning autostrainer by detergent - Google Patents

Abstract

The present invention relates to a chemical cleaning apparatus and method of an auto strainer, in particular a storage tank having a space portion for storing the original waste water; One side of the reservoir; The other side is connected to the waste water discharge portion and the tubular body, an autostrainer having a plurality of screens inside; A pump installed on a tubular path connecting the reservoir and the auto strainer; One side is a front end of the pump, the other side is connected to the valve by the rear end of the auto strainer to form a closed loop for cleaning by the chemical, the cleaning tank in which the cleaning chemicals are stored; A wastewater inflow and inlet valve disposed at the front and rear ends of the autostrainer and connected to the front and rear ends of the autostrainer to perform opening and closing operations at the inflow of the wastewater and the outflow of the wastewater; And a valve disposed at the front and rear ends of the cleaning tank, wherein the waste water inlet and outlet valves are closed to form a closed loop to circulate the autostrainer so that the cleaning chemical provided from the cleaning tank is circulated by the pump. It provides a chemical cleaning apparatus and method of the auto-strainer comprising a; circulation valve for cleaning the foreign matter inside the auto-strainer.

Auto Strainers, Screens, Cleaning Agents, Pollutants

Description

Chemical cleaning device and method of auto strainer {APPARATUS AND METHOD FOR CLEANING AUTOSTRAINER BY DETERGENT}

1 is a schematic diagram showing an apparatus for treating wastewater using an autostrainer.

Figure 2 is a block diagram of the drug cleaning method steps using the chemical cleaning device of the auto strainer according to the present invention.

3 is a graph showing a processing flow rate that varies with the operating frequency of the auto strainer.

※ Explanation of symbols about main part of drawing ※

1: raw wastewater reservoir 2: pump

3: autostrainer 4: screen

5: cleaning tank 6: 1st valve

7: second valve 8: third valve

9: fourth valve 10: fifth valve

11: first branch 12: second branch

13: third branch point 14: waste washing liquid discharge part

15: treated water discharge part

The present invention relates to an apparatus and method for cleaning chemicals of an autostrainer, and more particularly, to process an autostrainer contaminated with an oil component and scale during a wastewater treatment process without separating the screen from the main body using the cleaning apparatus and the cleaning agent. It is related with the washing | cleaning method which can wash | clean directly inside.

In the steel industry, a large amount of cooling water is required to cool steel products. During this cooling process, cooling wastewater containing a large amount of suspended solids such as scale and oil is generated. The waste water is used to directly cool steel products by removing suspended solids in water treatment processes such as sedimentation tanks and sand filters, cooling them in cooling towers, and spraying them through spray nozzles. At this time, when there is a lot of oil components in the waste water is not removed in the water treatment process as the flow into the nozzle (closure) (閉 塞) there is a problem that the cooling efficiency is lowered.

Therefore, an autostrainer is installed at the front end of the spray nozzle to remove suspended matter.

The autostrainer removes suspended substances according to the size of the screen mounted inside. When used for a certain period of time, the suspended solids are deposited on the surface of the screen to reduce the flow rate. At this time, the foreign substance on the screen surface is removed by the backwash operation of the autostrainer. Such an operation is configured to be automatically performed.

However, if it is used for a long time, sticky sludge that is not removed by backwashing due to the oil component in the waste water adheres to the screen surface and the inside of the autostrainer. Will decrease. Such sticky sludge and inorganic scales are not easily removed by simple backwashing operations. In this case, the screen is generally separated from the autostrainer body, the screen is cleaned with a brush or other tool, and the autostrainer body is cleaned with high pressure water, etc., and then the screen is mounted on the autostrainer body again. . However, large capacity auto strainer is equipped with 50 ~ 150 screens, there is a problem that requires a lot of time and effort to separate and clean and re-fasten.

Therefore, there is a need for an apparatus and method for cleaning an autostrainer using a cleaning device and a cleaning agent without removing the screen.

In order to solve the above problems, the present invention is to provide an apparatus and method for cleaning an auto strainer for efficiently cleaning the adhesive foreign substances that are not removed by back washing in the auto strainer during the wastewater treatment process without separating the screen. The purpose.

A raw waste water storage tank having a space part for storing the raw waste water inside;

One front end is connected to the reservoir, the other rear end is connected to the treatment water discharge unit and the waste washing liquid discharge unit and the rear end of the washing tank by the tubular body, the plurality of screens are provided with an autostrainer;

A pump installed on a pipe path connecting the reservoir and the auto strainer;

One side is a front end of the pump, the other side is connected to the auto strainer to form a closed loop for cleaning by the chemical, the cleaning tank in which the cleaning chemicals are stored;

A wastewater inlet and outlet valve disposed at the front and rear ends of the autostrainer and performing opening and closing operations during the inflow of the wastewater and the outflow of the treated water; And

Disposed at the front and rear ends of the cleaning tank, respectively, the waste water inflow valve and the cleaning liquid discharge control valve are opened to connect the closed loop so that the cleaning chemicals supplied from the cleaning tank are circulated by the pump. A circulation valve for cleaning foreign matter inside the strainer;

It provides a chemical cleaning apparatus of the auto strainer comprising a.

The wastewater inflow and outflow valve is provided at a front end of one side to which the cleaning tank is connected, and is provided at a rear end of the first strainer to supply the wastewater of the original wastewater storage tank to the autostrainer, and is discharged after the wastewater treatment by the autostrainer. A second valve for controlling the discharge of the treated water to be disposed on a path branched to the waste washing liquid discharge side on the tubular path between the front end of the washing tank and the rear end of the auto strainer to discharge residual waste washing liquid and contaminants in the closed loop. And a third valve that is adjusted for the purpose.

In another aspect, the present invention, filling the cleaning chemicals into the cleaning tank;

Operating the pump with the wastewater inflow valve and the waste cleaning liquid valve closed to uniformly contact the cleaning chemicals with the plurality of screen surfaces coupled to the interior of the autostrainer and the interior of the autostrainer;

Stopping the pump, closing all valves and then depositing to remove or dissolve contaminants deposited in the autostrainer;

By operating the pump with the waste water inlet and waste cleaning liquid valves closed and the circulation valve open, the cleaning chemicals are circulated to the closed loop to remove contaminants deposited on the screen of the autostrainer body and the screen connected to the autostrainer. Desorption; And

Opening the tubular valves leading to the waste washing liquid discharge part from the washing tank and operating the pump with the remaining valves closed to discharge the desorbed contaminants and waste cleaning chemicals to the outside through the washing liquid discharge part.

It provides a cleaning method of the auto strainer comprising a.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of a cleaning apparatus according to the present invention.

As shown in FIG. 1, the raw wastewater storage tank 1 in which wastewater is stored and the autostrainer 3 are connected by a tubular body, and the cleaning chemical is transferred to the autostrainer 3 through the first branch point 11. 3) There is a pump (2) to be able to spray strongly inside.

Inside the autostrainer 2, a plurality of screens 4 coated with a refractory material are installed.

One side is connected to the first branch point 11 between the original wastewater storage tank 1 and the auto strainer 3 by a tubular body, and the other side thereof is the second branch point 12 between the auto strainer 3 and the waste washing liquid discharge portion 14. Cleaning tank (5) connected to the tubular body accommodates the cleaning chemicals. Herein, the waste washing liquid is meant to include contaminants deposited and removed by the cleaning chemicals.

The first valve 6 is a wastewater inlet valve for controlling the inflow of wastewater from the original wastewater reservoir 1 into the autostrainer 3, and the second valve 7 is connected to the screen 4 of the autostrainer 3. A wastewater discharge valve for controlling the discharge of the treated water treated by the wastewater, and the third valve 8 controls the discharge of the waste washing liquid containing the desorbed contaminants of the autostrainer that is removed by the cleaning chemical. Cleaning fluid discharge valve.

The first valve 6 is located between the raw waste water reservoir 1 and the first branch point 11, and the second valve 7 is located between the second branch point 12 and the treated water discharge portion 15. The third valve 8 is located between the third branch point 13 and the waste washing liquid discharge portion 14.

The fourth valve 9 serves to allow the cleaning chemicals of the cleaning tank 5 to flow back into the cleaning tank 5 after passing through the auto strainer 3, and the cleaning tank 5 and the third branch point ( 13) located between.

In addition, the fifth valve 10 serves to control the supply of the cleaning chemicals of the cleaning tank 5 to the auto strainer 3, and the first branching point between the cleaning tank 5 and the pump 2 11) is located between.

The cleaning method using the cleaning apparatus of the autostrainer according to the present invention will be described with reference to the block diagram shown in FIG.

First, the cleaning chemicals are filled in the cleaning tank 5 (S1).

Circulation to circulate the cleaning chemicals in a state in which both the first valve 6 for regulating wastewater inflow, the second valve 7 for regulating the treatment water discharge, and the third valve 8 for regulating wastewater discharge are closed. When the pump 2 is operated after opening the fourth valve 9 and the fifth valve 10 which are the valves, the cleaning chemicals circulate through the closed loop, and the cleaning chemicals in the cleaning tank 5 The surface of the plurality of screens 4 coupled to the inside of the autostrainer 3 is evenly contacted (S2).

After the cleaning chemicals are in contact with each other, the pump 2 is stopped and the open fourth valve 9 and the fifth valve 10 are closed to remove or dissolve contaminants accumulated in the autostrainer 3. To soak (S3). At this time, all the valves (6, 7, 8, 9, 10) for treating the waste water and circulating the cleaning chemicals are closed.

The inside of the autostrainer 3 and the screen 4 are deposited for a predetermined time by the cleaning chemical, and then the first valve 6 and the second valve 7 which regulate the inflow of the waste water and the outflow of the treated water are closed. The third valve 8 for controlling the discharge of the waste washing liquid is also closed, and the pump 2 is operated by circulating the washing liquid while the fourth valve 9 and the fifth valve 10 which are the circulating valves are opened to circulate the washing liquid. (2) The contaminants deposited in the main body and on the screen 4 are detached (S4).

Thereafter, the fourth valve 9, which is one of the circulation valves, is closed, and the third valve 8 for controlling the discharge of the waste washing liquid is opened, and the pump 2 is operated to detach from the autostrainer 3 and the screen 4. The waste washing liquid containing the contaminated material is discharged to the outside through the third valve 8 and through the waste washing liquid discharge unit 14 (S5).

At this time, the first valve 6, the second valve 7, and the fourth valve 9 are in a closed state, and only the fifth valve 10 and the third valve 8 are open. Therefore, the waste washing liquid remaining in the washing tank 5 is discharged to the outside via the auto strainer 3 by the operation of the pump 2.

Hereinafter, a preferred embodiment of the present invention to aid the understanding of the chemical cleaning apparatus and cleaning method of the auto strainer is shown through FIG. However, the following examples are provided only to more easily understand the present invention, and the present invention is not limited to the following examples.

EXAMPLE

This embodiment is treated using an auto strainer (3) to remove suspended solids during the direct cooling water treatment process of the steelmaking process, when the flow rate of the auto strainer (3) is reduced by using the cleaning device and cleaning chemicals The strainer (3) was carried out to confirm the cleaning effect.

The autostrainer 3 is made of stainless steel having a diameter of 460 mm and a height of 800 mm, and is equipped with 10 screens 4 each having a size of 120 μm. The operating conditions were set to backwash for 40 seconds after 60 minutes of operation. When the treatment flow rate decreased, the screen was contaminated and chemical cleaning was performed.

Two types of cleaning chemicals were used, 1 ~ 2% solution of caustic soda (NaOH) as oil cleaner, and 0.5 ~ 0.7% solution of hydrochloric acid (HCl) as inorganic scale cleaner.

After filling the cleaning chemicals into the cleaning tank (5) (S1), close the waste water inlet and outlet valves (6), (7) and (8), and open the pump (2) with the circulation valves (9) and (10) open. The cleaning agent was allowed to run for a while to uniformly contact the inside of the screen 4 and the auto strainer 3 (S2).

After that, the pump 2 was stopped and all the valves 6, 7, 8, 9 and 10 were closed and then soaked for 4 to 6 hours (S3).

Next, the waste water inflow and outflow valves 6, 7, and 8 are closed, and the pump 2 is operated for 30 minutes while the circulation valves 9 and 10 are opened (S4). ).

Finally, the first, second, and fourth valves (6), (7), and (9) are closed, and the washing tank (with the third and fifth valves (8) and (10) open. The pump 2 was operated until the waste washing liquid (cleaning waste liquid) in 5) disappeared, and the waste washing liquid containing contaminants was discharged to the outside (S5).

3 shows the treatment flow rate according to the operation date of the auto strainer 3, and a caustic soda solution was used as the primary cleaning liquid.

Experimental results showed that the initial flow rate of autostrainer (3) increased to 5㎥ / hr. After the operation was continued for about 40 days, the treatment flow rate was reduced to 3㎥ / hr. Was carried out.

As a result, the treatment flow rate was found to increase to 5㎥ / hr.

Therefore, when the flow rate of the autostrainer 3 is reduced, the autostrainer 3 is processed by using the cleaning apparatus and cleaning method of the present invention, so that the autostrainer 3 can handle the normal flow rate. It was found that he recovered.

According to the present invention, through the cleaning device and method of the auto strainer has an effect that can completely remove the contaminants that are not removed by backwashing.

Claims (6)

A raw waste water storage tank having a space part for storing the raw waste water inside; One front end is connected to the reservoir via a pump, and the other rear end is connected to the treatment water discharge part and the waste washing liquid discharge part and the front end of the washing tank by an autostrainer having a plurality of screens therein; A pump installed on a pipe path connecting the reservoir and the auto strainer; One side is a front end of the pump, the other side is connected to the rear end of the auto strainer to form a closed loop for cleaning by the chemical, the cleaning tank in which the cleaning chemicals are stored; A wastewater inlet and outlet valve disposed at the front and rear ends of the autostrainer and operated at the time of inflow and outflow of the wastewater and at the time of discharge of the waste washing liquid; And A valve disposed at a front end and a rear end of the cleaning tank, wherein the waste water inlet and outlet valves are opened to connect the closed loops so that the cleaning chemicals in the cleaning tanks are circulated in the closed loops by the pump. A circulation valve for cleaning foreign matter inside the strainer; Chemical strainer cleaning device of the autostrainer comprising a. The method of claim 1, The wastewater inflow valve, A first valve provided at a front end of one side to which the cleaning tank is connected to supply the wastewater of the original wastewater storage tank to the autostrainer, and a rear end of the autostrainer, the treated water discharged after the wastewater treatment from the autostrainer. A second valve for regulating discharge, disposed on a path branched to the waste washing liquid discharge side on the tubular path between the front end of the cleaning tank and the rear end of the auto strainer, and configured to discharge residual waste washing liquid and contaminants in the closed loop; 3 valve Chemical strainer of the auto strainer, characterized in that consisting of. The method according to claim 1 or 2, The circulation valve, A fifth valve disposed between the pump and the cleaning tank outlet part in the closed loop to open and control the cleaning chemicals of the cleaning tank to be supplied to the auto strainer, and the cleaning tank inlet part and the auto strainer discharge part in the closed loop. And a fourth valve disposed between the branch branch to the waste washing liquid discharge portion and the washing tank inlet portion in the pipe path therebetween to open and control the inflow of the cleaning chemical into the washing tank during circulation of the waste water and the cleaning chemicals. A chemical cleaning device for an auto strainer. Filling the cleaning chemicals into the cleaning tank; Closing the wastewater inlet valve and operating the pump with the circulation valve open to bring the cleaning chemical into uniform contact with the plurality of screen surfaces coupled to the interior of the autostrainer and the interior of the autostrainer; Stopping the pump, closing all valves and then depositing to remove or dissolve contaminants deposited in the autostrainer; Removing the contaminants deposited on the screen coupled to the autostrainer body and the autostrainer by operating the pump to close the wastewater inlet valve and opening the circulation valve to circulate the cleaning chemical into the closed circuit; And Opening the tubular valves from the washing tank to the waste washing liquid discharge part and operating the pump with the remaining valves closed to discharge the desorbed contaminants and waste washing liquid to the outside; Autostrainer cleaning method comprising a. The method of claim 4, wherein The cleaning agent is a cleaning method of the auto strainer, characterized in that 1 to 2% solution of caustic soda as an oil cleaning agent. The method of claim 4, wherein The cleaning chemical is an inorganic scale cleaning chemical cleaning method of the autostrainer, characterized in that 0.5 to 0.7% solution of hydrochloric acid is used.

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