KR20220111756A - The Coating apparatus inside steel pipe used in water treatment system - Google Patents

Abstract

The present invention relates to a coating device for removing foreign substances inside a steel pipe used as a pipe in a water treatment system and extending durability, and specifically, to technology for an inner coating device for a pipe, wherein foreign substances including scale and rust inside the steel pipe installed and used in the water treatment system are cleanly removed by sequentially utilizing cylindrical metal pigs and spherical metal pigs and are washed with washing water, and coating is performed using nano-inorganic materials.

Description

The coating apparatus inside steel pipe used in water treatment system

The present invention relates to a pressure-type sewage pipe and an apparatus for coating the inside of a steel pipe of a wastewater transport pipe, and more particularly, the pressure-type sewage pipe and the wastewater transport pipe that are buried or cannot be separated from the system are inside the steel pipe without separate separation from the system It relates to a device and system for automatic internal cleaning and nano-inorganic coating of steel pipes of sewage and wastewater transport pipes that can clean and minimize operation stop during cleaning and coating by performing nano-inorganic coating after cleaning.

The present invention relates to an internal coating device for a delivery pipe used in a water treatment system, and more particularly, automatic cleaning and nano-inorganic coating can be performed on the inside of a pressure-type sewage pipe and wastewater delivery pipe without separate separation from the water treatment system. It relates to a device and system for automatic internal cleaning and nano-inorganic coating of sewage and wastewater pipelines.

The situation that fluid delivery piping of slurry system containing a lot of suspended particles, such as sewage and leachate, is changing from natural flow piping to pressure sewage piping and wastewater piping in accordance with the advancement of the domestic industrial base. to be.

Until now, a method of collecting and transferring fluid by natural flow using a large-diameter concrete pipe has been applied. There were many problems such as environmental pollution due to leakage of sewage due to the current situation and the breakage of concrete pipes.

Therefore, a method proposed as a solution to this is a pressure-type sewage pipe and wastewater pipe system using a steel pipe.

The pressure-type sewage pipe and wastewater pipe system using steel pipes can efficiently perform the runoff management system, and since it is possible to use a pipe with a small pipe diameter, it can reduce the construction cost for excavation and burial, and

It has many advantages, such as prevention of environmental pollution and improvement of transport capacity of fluids with many suspended particles.

However, in spite of the above advantages, a piping system using a steel pipe has many problems such as corrosion of the steel pipe due to long-term use and internal clogging due to the attachment of foreign substances. And even if it is impossible or possible to replace it, a very serious problem occurred that the operation had to be stopped for a long time.

In addition, even in the case of a separately separable steel pipe, in order to perform cleaning and coating, it is necessary to move the space after separation from the system to achieve a cleaning process and a coating process, so cleaning and coating takes a lot of time. The economic damage caused by the operation suspension is very large.

Publication No. 10-2008-0068378 Publication Date: July 23, 2008

The present invention provides a coating device capable of coating using a nano-inorganic material after washing and washing to remove foreign substances inside the steel pipe that is difficult to separate from the water treatment system or the inside of the steel pipe that cannot be separated due to burial, etc., without separating it from the water treatment system. The purpose of development is to secure long-term durability and obtain economical effects by minimizing the period of downtime required for cleaning and coating in particular.

The present invention has been devised to solve the above problems, and removes foreign substances attached or adhered to the inside of a steel pipe by using a pig invented to maximize the pressure of washing water during washing, and collects the removed foreign substances After the removal of foreign substances is completed, the inside of the pipe (steel pipe) is dried using dry air after washing with clean washing water. After attaching the nano-inorganic material to the inside of the steel pipe by coating the inside of the steel pipe using It was intended to present a pipe inner coating device that can be used.

The present invention secures long-term durability by coating using a nano-inorganic material after washing and cleaning to remove foreign substances without separating the inside of a steel pipe that is difficult to separate from a water treatment system or a steel pipe that cannot be separated by burial, etc. In particular, there is an economic effect by minimizing the period of downtime required for cleaning and coating.

1 is a configuration diagram of a general sewage treatment system;
2 is a structural diagram of a cleaning device according to the present invention;
3 is a structural diagram of a coating apparatus according to the present invention;
Figure 4 is a cylindrical metal pig used in the present invention
5 is a perspective view, a plan view, and an actual model view of a spherical metal pig used in the present invention;

In order to carry out the present invention, the detailed content of the coating device inside the pipe developed to coat the steel pipes of various sizes used in the water treatment system after washing is as follows.

1 is a diagram showing the sewage treatment system. When sewage flows in, sediment contaminants are removed through a sedimentation sediment remover, and after biological treatment in a bioreactor through a flow rate adjustment tank, it is disinfected in a filtration facility and a disinfection facility through a treatment tank. Some of the sludge treated in the system and the bioreactor after being discharged is reintroduced into the bioreactor through the return sludge pump, and the remaining part of the sludge is transferred to the sludge storage tank through the surplus sludge pump and discharged after dehydration. All pipes (steel pipes) connecting the pipes (steel pipes) generate foreign matter and scale, including rust, inside the steel pipe over time, obstructing the flow of sewage treatment water inside the steel pipe, and eventually clogging or corrosion of the steel pipe causing leakage of the steel pipe and should be replaced. Since the treatment efficiency is rapidly reduced due to the occurrence of will do

All the above pipes (steel pipes) are several kilometers or tens of kilometers depending on the size of the sewage treatment plant, and some pipes are buried or some problematic pipes cannot be separated from the system, so only the problematic pipes are separated and cleaned. Coating presents very difficult technical problems.

In addition, even if the problematic pipe connected to the system can be separated, it takes a lot of time, manpower and cost, such as having to move to a factory where work is possible for cleaning and nano-inorganic coating to remove all foreign substances by separating the pipe, resulting in economic loss. Because of its size, in the present invention, it is possible to reduce the downtime as much as possible without separating the steel pipe from the system for steel pipes that are a problem in the water treatment system or that require cleaning and coating due to long-term use. By using the coating device inside the pipe of the present invention without separating only the problematic steel pipe from a separate system because it can be cleaned and dried, high-quality coating after cleaning is possible and the life of the steel pipe can be extended at the same time, making it economical, It can be said to be of great technical significance.

In particular, cleaning the inside of the pipe, which is a problem, sometimes increases the efficiency of the system through cleaning, but after cleaning, to extend the durable life of the pipe, coating it using various coating materials for the purpose of extending the system's efficiency and lifespan. Clean cleaning inside the pipe is a very important technical part. If cleaning is wrong, it is difficult to secure the durability of the coating even if it is coated in the future. Cleaning through various metal pigs and inorganic coating using pigs such as sponges are the most important technical components of the present invention.

In order to carry out the present invention, the detailed description of the pipe coating apparatus developed for cleaning and coating steel pipes of various sizes used in a water treatment system is described in detail using the drawings below.

As shown in FIG. 3, the pipe coating apparatus of the present invention has an air compressor 900, a compressed air shutoff valve 901, and a connection mechanism 3 (2001), 4 ( 2002) and the raw material storage tank 800, and the control valve 802 for constantly controlling the height of the raw material storage tank 800 by replenishing the raw material in the raw material replenishment container 801 by interlocking with the height of the raw material storage tank 800. A device for coating using a raw material pig 503 floating on the raw material upper part of the raw material storage tank 800, and the connecting mechanism 3 (2001) is a heater 701 to make the compressed air of the air compressor 600 high temperature. ) is built-in and is configured to control the temperature of the compressed air by using the temperature control device 700 .

The coating apparatus of the present invention performs cleaning before coating using the cleaning apparatus shown in FIG. 2, and the cleaning apparatus is a coupling mechanism 1 (flexible tube or hose, 201) so that the cleaning water can be pressurized from the storage tank through a pressure pump ) is directly connected to the disassembled flange, and the outlet side flange of the pipe to be cleaned is dismantled and connected with the flange connected to the coupling mechanism 2 (flexible pipe or hose, 202) of the washing water recovery tank of the present invention to circulate The system is configured to enable this, and the washing water recovery tank 400 is separated using a separation filter 401, and the lower part is a funnel shape and is filtered using a double locking device 600 to filter foreign substances including deposited rust. Excess scale and the like can be periodically discharged, and a fine filter 404 is installed at the outlet side of the washing water to filter out fine foreign substances that are not separated by the separation filter 401, so that the filtered clean washing water is stored in the washing water storage tank 100 ), so that the filtered washing water can be circulated or reused in real time.

In addition, the metal pig inlet 403 installed at the rear end of the pressurization pump 101 connected to the washing water storage tank 100 is installed so that metal pigs of various shapes can be put in according to the input order according to the purpose, and the washing water recovery tank ( 400), a metal pig collecting port 402 that can collect various metal pigs used is installed to control the amount and time of input of metal pigs according to the state of attachment of foreign substances inside the pipe, including scale and rust inside the pipe. In order to completely remove foreign substances, it is possible to remove foreign substances including rust and scale through the pig.

In the foreign material removal process, various control facilities such as a valve for controlling the flow of sewage connected to the inside of the pipe may be damaged by the metal pig injected to remove the foreign material during cleaning, so all control facilities such as valves are cleaned It should be opened as much as possible, and unless there are special circumstances, it is necessary to connect with the flange of the washing water storage tank and the washing water recovery tank so that there is no control equipment such as a valve between the inlet and outlet flanges of the pipe.

In addition, since most pipes are bent at various angles as needed rather than straight, the size of the inside of the pipe and the attachment state of foreign substances including scale or rust attached to the inside of the pipe so as not to interfere with the flow of the cleaning metal pig in the bent area It is necessary to use a metal pig appropriately sized accordingly. In general, in the case of a straight pipe, the size of the metal pig is about 80% of the inside size of the pipe. Set up a pig and use it for cleaning.

The metal pig used for removing foreign substances can be divided into two types, and in some cases, various types of pigs can be manufactured and used. One of the metal pigs used in the present invention is a cylindrical 501 having a trapezoidal shape or The front part is formed to have a hemispherical shape, and the cylindrical exterior is formed in polygons such as triangles, rhombuses, and squares to act as a blade to remove foreign substances attached to the inside of the inner tube. It is formed in a spiral, impeller or propeller so that it can be rotated so that it can be rotated according to the pressure applied to remove foreign substances including scale and rust attached to the inside of the pipe. Afterwards, in order to completely remove and organize foreign substances including scale and rust remaining inside the pipe, the second form of the present invention, a spherical or egg-shaped metal pig 502, is used to completely remove foreign substances including scale and rust. made available for use.

The spherical or egg-shaped metal pig 502 used at this time is a spherical or egg-shaped metal pig receiving flow energy and having two or more convex shapes so that it can freely rotate inside the pipe, and the efficiency is improved so that it can rotate in all directions. In order to increase the height, the concave part can be variously transformed into an S-shaped spiral and the shape of an impeller. It was formed to completely remove and organize foreign substances including rust and rust. In the present invention, an iron brush, etc. is formed on the outermost part of the four convex shapes so that it can be cleaned. The spherical metal pig is configured to be rotatable in all directions by using the flow velocity energy of the washing water, unlike the cylindrical metal pig.

The cylindrical (501) and spherical (502) metal pigs have a rotatable structure by receiving flow rate energy, which can be used in the metal pig of the present invention.

In addition, since the above cylindrical and spherical metal pigs can easily lose their required functions due to friction with the inside of the steel pipe used as a pipe, all metal pigs have hardness on the surface of the metal pig so that the hardness can be 7H or higher It is better to apply a coating using an inorganic material that can increase the

The cleaning technology of the present invention is a very important operation because rust and scale must be removed in order to proceed with coating because rust due to scale or corrosion is generated and attached to the inside of the steel pipe depending on the number of years of use of the pipe to be cleaned. Stainless steel pipe is often used to prevent rust. At this time, if the pipe to be cleaned is a metal product with reduced rust, such as stainless steel, and the adhesion of foreign substances inside the pipe is relatively good, use only washing water without using a metal pig, and the washing water used at this time is 1%. The following strong acids are used. Generally, hydrofluoric acid, hydrochloric acid, sulfuric acid, and nitric acid are used for strong acids depending on the type of steel pipe, and industrial strong acid is diluted to less than 1%. In the case where it is difficult to remove the rust and scale adhered by shortening of the steel pipe and chemical cleaning, or when the degree of adhesion of foreign substances is severe, the above metal pig can be used at the same time to remove rust and scale (foreign substances) inside the steel pipe.

If the pipe to be cleaned is made of a metal that is not chemically stable and easily corroded, such as stainless steel, the use of strong acid will rather promote corrosion. can be cleaned.

In this case, the cleaning water used is such that, as described above, when the adhesion of foreign substances including scale and rust is severe, the metal pig is put together to ensure complete cleaning. All washing water used in the present invention may be any liquid washing water such as alkali detergent or washing water prepared including strong acid, including commonly used water, and when strong acid is used as washing water, alkali It is recommended to neutralize it with washing water and finish washing with clean water.

In the case of using a metal pig, firstly, a trapezoidal cylindrical metal pig 501 is put in to remove adhering foreign substances, and the ladder shape is for smooth progress in the moving direction inside the pipe, and if it proceeds smoothly, any In order to increase the flow rate energy not only inside the cylinder but also outside the cylinder, two or more helical-shaped blades are configured in the straight direction of the cylinder to remove the scale inside the pipe and the generated rust and foreign substances. can be configured as

As described above, when foreign substances attached to the inside of the pipe are completely removed through cleaning, all moisture inside the pipe is removed using dry air and a flexible material such as a sponge or a coating material such as a fiber is stored. In order to be able to move by air pressure, pigs are manufactured with a size of about 80% of the inside diameter of the pipe and the inside of the pipe is coated with inorganic materials.

In the present invention, a compressor (air compressor, 900) is required for drying inside the pipe and transmission of the pig, and the coupling mechanism 3 (2001) is connected to the outlet side of the compressor (900) and discharged from the raw material storage tank (800) ( 503) compresses air so that it can enter the pipe using compressed air, and the pig 503 is configured to be able to enter the raw material storage tank 800 after coating the inside of the pipe 203 . The coating pig 503 is light so that it can be suspended on the upper part of the liquid inorganic raw material, and the floating pig is configured to be discharged to the outlet side of the raw material storage tank after sufficiently absorbing the raw material in the raw material storage tank 800 by compressed air. At the outlet side, the end of the pig is made 90% smaller than the diameter of the pig, so that the raw material contained in the pig can be controlled. By using the raw material of the container 801, the raw material height of the raw material storage tank 800 was configured to be constantly maintained.

When the coating inside the pipe is completed, the pig is recovered through the pig collecting port, and the moisture inside the pipe is dried using moisture or air at room temperature for several tens of minutes. configured to do so.

The coupling mechanisms 3 (2001) and 4 (2002) should use a material that can withstand 300 ℃, and a heater 701 is installed in the coupling mechanism 3 (2001) to control the temperature of compressed air to around 300 ℃ A temperature control device 700 that can do this was configured. Of course, it is possible to control the temperature of the air by installing a heater separately from the coupling mechanism. The heater 701 is used by appropriately controlling the temperature for drying or heat treatment (sintering) inside the pipe 203 and constitutes a control device 700 capable of separately controlling the temperature.

In particular, if it is determined that the proper amount of the coating material is attached to the inside of the pipe during coating, dry it for about 10 to 20 using room temperature air and heat it for about 10 to 30 minutes at a temperature of around 100°C to prevent the occurrence of bubbles in the coating layer. It can be suppressed as much as possible, and then heat treatment (firing) is performed at a temperature of around 300℃ to finish coating the inorganic coating material inside the steel pipe.

At this time, the higher the heat treatment temperature, the more functional and durable the heat treatment time is.

In addition, it is recommended that the coating thickness be maintained at about 1 to 10 μm after heat treatment.

After going through all of the above coating processes, the coating and heat treatment process can be repeated 2 or 3 times to further extend the durability life, and it is a natural truth that the durability life is extended by increasing the coating thickness.

The coating raw material used above is a nano-inorganic material.

At least one of sodium oxide (Na ₂ O), potassium oxide (K ₂ O), and lithium oxide (Li ₂ O) which is an alkali metal oxide (M ₂ O) represented by the following formula is included; inorganic acid compounds; and water (H ₂ O);

[Formula] (x ₁ Na ₂ O+x ₂ K ₂ O+x ₃ Li ₂ O) ySiO ₂ nH ₂ O

x₂+x₃ ), y >= X를 만족한다.In the above formula (x ₁ Na ₂ O+x ₂ K ₂ O+x ₃ Li ₂ O)·ySiO ₂ , X>0, (X=x ₁ +x ₂ +x ₃ and x _1, x _2, x ₃ >= 0, x ₁

x ₂ +x ₃ ), y >= X.

In 100 parts by weight of the nano-inorganic composition ((x ₁ Na ₂ O+x ₂ K ₂ O+x ₃ Li ₂ O)·ySiO ₂ ·nH ₂ O) represented by the above formula (M ₂ O+ySiO ₂ ) is 0.1 It is characterized in that it contains ~10 parts by weight and 0.01 to 2 parts by weight of the inorganic acid compound and the remainder of water.

The composition represented by the above formula may further include a dispersing agent, a catalyst, a surfactant, and the like, depending on the required functionality, the coating method and the coating apparatus.

Changes in the composition according to the above coating device may vary depending on the pretreatment equipment. In particular, depending on whether the surface of the base material is hydrophilic, a surfactant is included to improve adhesion properties, and a dispersant is added to improve the dispersion of color pigments for color. It may further include a catalyst for shortening the production time of the composition and accelerating a chemical reaction, and the like.

The amount of the added solvent (water + inorganic acid compound) is greater than the solubility of the added alkali metal oxide in the solvent, and phosphoric acid or boric acid is mainly used as the inorganic acid compound.

The nano-inorganic composition of the present invention may be prepared by including one, two, and all three of x ₁ Na ₂ O, x ₂ K ₂ O, and x ₃ Li ₂ O represented by the above formula. That is, the present invention includes at least one or more of the alkali metal oxides shown in the above formula, thereby increasing the adhesion or adhesion with the base material while increasing the easy-clean properties of the coating thin film, antifouling properties, water resistance and mechanical (hardness and abrasion). Properties) and chemical (corrosion and chemical resistance) properties, including nano-inorganic coatings that improve various high-functionality can be implemented.

In the above formula of the present invention, X is the number of moles of alkali metal oxides (M ₂ O) included in the nano-inorganic composition, and y is the number of moles of silica (SiO ₂ ), and the number of moles of silica is always greater than or equal to the number of moles of alkali metal y *?*X must be satisfied, and among the number of moles of sodium oxide (Na ₂ O) x ₁ , the number of moles of potassium oxide (K ₂ O) x ₂ , and the number of moles of lithium oxide (Li ₂ O) x ₃ , x ₁ +x ₂ +x ₃ ) always satisfies X > 0 as a number greater than 0, and each alkali metal oxide is a number greater than or equal to 0, such as x _1, x _2, x ₃ *?*0. can be expressed

The one embodiment of the present invention described above is only for describing specific embodiments of the present invention, and is not intended to limit the scope of the present invention. In addition, various changes or modifications may be made to the present invention after a person skilled in the art understands the contents of the present invention, but it is apparent that all of these fall within the technical spirit and scope of the present invention.

100: washing water storage tank, 101: pressurized pump
200: coupling mechanism (201: coupling mechanism 1, 202: coupling mechanism 2, 203: cleaning target steel pipe, coupling mechanism 3: 2001, coupling mechanism 4: 2002)
300: sludge recovery tank
400: washing water recovery tank (401: separation filter, 402: pig collecting port, 403: pig inlet, 404: fine filter)
500: pig (501: cylindrical metal pig, 502: spherical metal pig, 503; raw material pig)
600: double locking device
700: temperature control device, 701: heater
800: raw material storage tank, 801: raw material replenishment container, 802: control valve for height control
900: air compressor (compressor), 901: compressed air shutoff valve, 902: raw material pig inlet

Claims (8)

In the pipe inner coating device used in the water treatment system,
An air compressor 900 that compresses air and
a raw material storage tank 800 for storing raw materials for coating; and
The outlet side of the air compressor 900 is connected to an outlet for discharging the pig 503 from the raw material storage tank 800, and a coupling mechanism 3 (2001) including a heater 701 capable of controlling the temperature is piped by It is connected to the inlet side of (203).
The inlet side of the raw material storage tank 800 is connected to the outlet side of the pipe 203 to enable circulation of the raw material pig 503 to which the coating material is attached to the inside of the pipe by a coupling mechanism 4 (2002). pipe coating equipment.
According to claim 1,
The coupling mechanism 3 (2001) uses a high-temperature material usable at 300°C, and a heater is built-in therein to control the compressed air temperature.
According to claim 1,
The raw material storage tank 800 is a pipe coating apparatus for a water treatment system, characterized in that the height is automatically controlled by the control valve 802 interlocked with the height. According to claim 1,
The raw material pig 503 is a pipe coating apparatus for a water treatment system, characterized in that it is manufactured to float on the coating raw material in the raw material storage tank (800). According to claim 1,
The pig 503 is a pipe coating apparatus for a water treatment system, characterized in that it is configured to have a diameter of 90% of the pig diameter in order to control the amount of raw material when discharged from the raw material storage tank (800). According to claim 1,
The pipe coating device of the water treatment system, characterized in that the coating thickness inside the pipe (203) is 1 ~ 10μm. According to claim 1,
The raw material includes at least one of sodium oxide (Na ₂ O), potassium oxide (K ₂ O), and lithium oxide (Li ₂ O) which is an alkali metal oxide (M ₂ O) represented by the following formula; inorganic acid compounds; and water (H ₂ O);
[Formula] (x ₁ Na ₂ O+x ₂ K ₂ O+x ₃ Li ₂ O) ySiO ₂ nH ₂ O
In the above formula (x ₁ Na ₂ O+x ₂ K ₂ O+x ₃ Li ₂ O)·ySiO ₂ , X>0, (X=x ₁ +x ₂ +x ₃ and x _1, x _2, x ₃ >= 0, x ₁

x ₂ +x ₃ ), y >= X.
In 100 parts by weight of the nano-inorganic composition ((x ₁ Na ₂ O+x ₂ K ₂ O+x ₃ Li ₂ O)·ySiO ₂ ·nH ₂ O) represented by the above formula (M ₂ O+ySiO ₂ ) is 0.1 ~10 parts by weight of the pipe coating apparatus for a water treatment system, characterized in that it contains 0.01 to 2 parts by weight of the inorganic acid compound and the remainder of water. According to claim 1,
A pipe coating device for a water treatment system, characterized in that the temperature control increases durability during high temperature and long-term heat treatment.

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