KR101419015B1 - Apparatus and method for removing scale - Google Patents

Apparatus and method for removing scale Download PDF

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Publication number
KR101419015B1
KR101419015B1 KR1020130017650A KR20130017650A KR101419015B1 KR 101419015 B1 KR101419015 B1 KR 101419015B1 KR 1020130017650 A KR1020130017650 A KR 1020130017650A KR 20130017650 A KR20130017650 A KR 20130017650A KR 101419015 B1 KR101419015 B1 KR 101419015B1
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KR
South Korea
Prior art keywords
flow velocity
pipe
plasma
flow rate
seawater
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KR1020130017650A
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Korean (ko)
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채진석
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채진석
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/24—Preventing accumulation of dirt or other matter in the pipes, e.g. by traps, by strainers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Cleaning In General (AREA)

Abstract

Provided are a scale removing apparatus and a scale removing method to check scales, which are generated inside the pipe of a seawater desalination plant, by measuring a flow velocity of seawater passing through the pipe and remove the scales by a plasma beam emitted into the pipe. The scale removing apparatus according to the present invention comprises: a flow velocity measuring part measuring the flow velocity of a fluid passing through a pipe; one or more plasma generating parts generating the plasma beam to remove the scales generated in the pipe; and a control part driving and controlling the plasma generating part by comparing the flow velocity measured by the flow velocity measuring part with a predetermined flow velocity, wherein the control part emits the plasma beam, which is generated by the plasma generating part, into the pipe when the flow velocity measured by the flow velocity measuring part is larger than or equal to the flow velocity predetermined through the control part.

Description

[0001] APPARATUS AND METHOD FOR REMOVING SCALE [0002]

The present invention relates to a scale removal apparatus and method, and more particularly, to a scale removal apparatus and method for removing a scale generated in a piping of a seawater desalination plant using a plasma.

Desalination means a series of water treatment processes in which high-purity drinking water, domestic water, industrial water, etc. are obtained by removing dissolved substances including salts from seawater which is difficult to be directly used for living water or industrial water. In addition, facilities used to produce seawater in fresh water are called seawater desalination plants.

The seawater desalination method is broadly divided into evaporation method and reverse osmosis method. The evaporation method is a method of heating seawater using a heat source and condensing the generated steam to obtain fresh water. Multi-stage flash (MSF) and multi-effect distillation (MED ). Reverse osmosis (RO) is a method of obtaining fresh water by passing seawater through semi-permeable membranes using reverse osmosis.

The seawater desalination plant is provided with a plurality of transfer lines for transferring seawater, and these transfer lines are usually composed of piping. A salt-containing compound, that is, a scale, is generated through the desalination process of seawater during the desalination process, and such scale can not be transferred to the outside through the pipe, but a part thereof is fixed to the inside of the pipe. As the amount of scale secured to the interior of the piping increases, the interior of the piping gradually becomes narrower, thereby impeding the transfer of seawater and reducing the efficiency of the fresh water production process.

Various scale removal apparatuses and methods have been proposed to solve these problems. According to a conventional example, in a seawater desalination plant using a multi-stage evaporation method or a multi-effusion method, a mechanical removal method, that is, a ball cleaning method is used to remove scales in a pipe (see Patent Document 1) . The ball cleaning method is a method in which a plurality of cleaning balls are passed through a pipe to physically remove scales fixed in the pipe. However, the ball cleaning method is difficult to accurately detect the inflow amount of the cleaning ball depending on the inflow amount of the seawater, and the recovery rate of the cleaning ball is remarkably deteriorated depending on the inflow amount of the seawater. In addition, the cleaning ball impacts the pipe to damage the pipe, and it is difficult to uniformly remove the scale throughout the pipe.

In a seawater desalination plant using a reverse osmosis method, a chemical descaling method using a cleaning agent is used for washing the semipermeable membrane (see Patent Document 2). However, in the chemical scale removal method, the inside of the pipe may be damaged by corrosion by the cleaning agent, and there is a difficulty in the process of performing a strict pretreatment so that the generated fresh water is not contaminated by the cleaning agent.

Korean Patent Publication No. 10-2005-0008214, published on January 21, 2005 Korean Patent Publication No. 10-2008-0049568, published date June 4, 2008

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a scale removal device for a pipeline which confirms a scale occurring in a piping of a seawater desalination plant by measuring the flow rate of seawater passing through the pipeline, ≪ / RTI >

The apparatus for removing scale according to an embodiment of the present invention includes a flow rate measuring unit for measuring a flow rate of a fluid passing through a pipe, at least one plasma generating unit for generating a plasma beam for removing a scale generated in the pipe, And a control unit for controlling the plasma generator by comparing the flow rate measured by the flow rate measuring unit with the set flow rate, wherein the controller controls the flow rate of the plasma generated by the plasma generator when the flow rate measured by the flow rate measuring unit is equal to or greater than a flow rate set through the controller , And a plasma beam generated from the plasma generating unit is ejected into the inside of the pipe.

In an embodiment, the piping is installed in a seawater desalination plant and comprises chloride as the scale that occurs in the piping.

In an embodiment, the plasma beam comprises at least one of a superoxide radical and a hydroxyl radical.

In an embodiment, the piping has a through-hole in which the plasma generating unit is provided, and the through-hole is provided with a door portion that is opened and closed by a pair of doors.

In an embodiment, the flow rate measuring section includes a measuring rod for positioning a flow rate measuring sensor at the center of the pipe.

A method for removing scale in accordance with an embodiment of the present invention includes the steps of measuring a flow rate of a fluid passing through a pipe, comparing a measured flow rate value of the fluid with a set flow rate value, Generating a plasma beam and ejecting the plasma beam into the interior of the pipeline, measuring the flow rate of the fluid again, comparing the measured flow rate value again with a set flow rate value, If the flow velocity value is greater than or equal to the set flow velocity value, continues to eject the plasma beam into the interior of the pipe, and stops the ejection of the plasma beam into the pipe when the measured flow velocity value is less than the preset flow velocity value .

In an embodiment, the scale comprises chloride produced in a seawater desalination process.

In an embodiment, the plasma beam comprises at least one of a superoxide radical and a hydroxyl radical that chemically reacts with the scale.

According to the scale removal apparatus and method of the present invention, it is possible to confirm the degree of adhesion of the scale in the piping of the seawater desalination plant by measuring the flow rate of the seawater passing through the piping. Therefore, it is possible to reduce the cost and time required for the scale removal work by preventing the scale removal work of the piping from being unnecessarily performed. If the scale in the piping needs to be removed by measuring the flow velocity of the seawater, the scale beam can be removed by ejecting the plasma beam into the piping. That is, it is possible to generate a radical having a high energy which is easy to chemically react through a plasma beam, and to react with a scale, which is a salt-containing compound, to remove uniformly. Further, when the scale is removed, damage to the piping can be prevented and corrosion resistance of the piping can be improved. In addition, the plasma beam can be ejected even when the seawater is not filled in the piping, thereby improving the operating efficiency of the desalination plant.

1 is a block diagram showing a descale apparatus according to an embodiment of the present invention.
2 is a schematic view illustrating a plasma generator used in a descale apparatus according to an embodiment of the present invention.
3 is a perspective view showing a plasma generating part applied to a pipe according to an embodiment.
4 is a perspective view showing a plasma generating part applied to a pipe according to another embodiment.
Fig. 5 is an end view of the piping in Fig. 3; Fig.
6 is a view showing the door portion viewed from the inside of the pipe.
7 is a view showing a plasma beam ejected into a pipe through a plasma generator.
8 is a flowchart illustrating a scale removal method according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a descale apparatus and method of the present invention will be described with reference to the accompanying drawings.

1 to 7, a descale apparatus 100 according to an embodiment of the present invention will be described. The descale apparatus 100 is a device for removing the scale 1 that is created and fixed in the piping 10 of the seawater desalination plant. However, the descaling apparatus 100 is not limited to the piping 10 of the seawater desalination plant, but may be applied to piping of various plants to be used for removing the scale 1.

In the embodiment, the scale 1 is made of a compound containing a salt mainly composed of Mg 2 + , Ca 2 + , that is, a chloride. This scale 1 is produced as a salt of calcium carbonate (CaCO 3 ) and magnesium hydroxide (Mg (OH) 2 ) according to the temperature of seawater and is fixed to the inner surface of the pipe 10 (see the following chemical formula 1).

[Chemical Formula 1]

2HCO 3 - → (Heat 66 ° C) - > CO 3 2 - + H 2 O + CO 2

The temperature of seawater is 66 ° C or less, CO 3 2 - + H 2 O + CO 2 + Ca 2 + → (Heat 66 ° C ↓) → CaCO 3

The temperature of seawater is above 77 ℃, CO 3 2 - + 2H 2 O + CO 2 → (Heat 77 ° C ↑)? 2OH - + Mg 2 + - & gt ; Mg (OH) 2

1, the scale removing apparatus 100 includes a plasma generating unit 110 for generating a plasma beam, a flow rate measuring unit 120 for measuring a flow rate of a fluid passing through the pipe 10, that is, And a control unit 130 for driving and controlling the plasma generating unit 110 according to the flow velocity measured by the flow velocity measuring unit 120.

The plasma generating section 110 includes means for generating a plasma beam at normal pressure, and various known types of atmospheric plasma apparatuses for surface treatment may be employed. In the embodiment, the plasma generating portion 110 has atmospheric pressure plasma jetting means (AAPJ) as shown in Fig. The plasma generating unit 110 includes a container 111 in which a coil is embedded in a vacuum state, a power supply 112 for applying a RF frequency source to a coil built in the container 111, A gas supplier 113 for supplying a neutral gas such as argon (Ar) or neon (Ne) or oxygen (O 2 ) gas to the inside of the container 111 is provided. The gas G supplied from the gas supplier 113 to the vessel 111 is accelerated by a magnetic field formed around the coil 111 and is ionized by the electric field inside the vessel 111 to be supplied to the plasma jet plasma jet. That is, a gas ionized to the outside from the plasma generating part 110 may be ejected in the form of a plasma beam (P). A nozzle 111a capable of changing direction can be provided at one end of the vessel 111 to change the direction of ejection of the plasma beam P. [ A direction changing means 111b is provided at a connecting portion between the nozzle 111a and the container 111 so as to rotate the nozzle 111a with respect to the container 111 and to extend or cut the nozzle 111a in the longitudinal direction . The direction switching means 111b is connected to the control unit 130 and receives drive control.

The plasma generating part 110 is disposed outside the pipe 10 and the nozzle 111a through which the plasma beam P is sprayed is installed to pass through the pipe 10. [ That is, the nozzle 111a is inserted into the through hole 11 formed in the pipe 10, is extended to the inside of the pipe 10 by the direction switching means 111b, The plasma beam P can be ejected onto the inner circumferential surface of the substrate 10.

3 and 4, a plurality of plasma generators 110 may be installed according to the inner diameter of the pipe 10, the inflow amount of the seawater passing through the pipe 10, and the like. As shown in FIG. 3, a plurality of plasma generators 110 may be installed at equal intervals or at predetermined intervals in the upper and lower portions in the longitudinal direction of the pipe 10. In particular, the plurality of plasma generators 110 may be installed in a zigzag shape in which the upper plasma generator and the lower plasma generator are alternately disposed along the longitudinal direction of the pipe 10. 4, the plasma generating portion 110 generates plasma in the longitudinal direction of the pipe 10 in the case of the pipe 10 'having a relatively larger inner diameter than the pipe 10 shown in FIG. , And a plurality of lower portions and both side portions may be provided at regular intervals or at predetermined intervals. In particular, the plurality of plasma generators 110 may be installed in a spiral shape along the longitudinal direction of the pipe 10 '. In another embodiment, three or more plasma generators 110 may be arranged in an annular band shape, and then may be provided to have a plurality of bands in the longitudinal direction of the pipe 10. A plurality of plasma generators 110 are provided in the piping 10 to uniformly spray the plasma beam P on the inner circumferential surface of the piping 10 so that the scale 1 Can be uniformly removed.

5, when the plasma generator 110 is not driven, the nozzle 111a inserted into the through-hole 11 of the pipe 10 is not damaged by the seawater, (Not shown). The door portion 114 includes a pair of doors 114a slidably engaged with each other and driving means such as a motor for driving the pair of doors 114a. The driving unit is driven and controlled under the control of the control unit 130. In the embodiment, the pair of doors 114a is a plate curved at the same curvature as the inner circumferential surface of the pipe 10 as shown in Fig. 6, and has a shape in which the opposing portions are helically engaged (Fig. 6 6A shows a state in which a pair of doors 114a are engaged, and FIG. 6B shows a state in which a pair of doors 114a are opened. The surface of the door 114a exposed to the inside of the pipe 10 is made of CuNi (Cu 70w%, Ni 30w%), CuNi (Cu 90w%, Ni 10w%), Al-Brass, Ti a corrosion preventing member such as titanium is coated.

That is, the pair of doors 114a can be precisely engaged with each other, so that engagement of the pair of doors 114a can be prevented from being arbitrarily released by seawater pressure or the like. That is, it is possible to prevent the inflow of the seawater into the through-hole 11, thereby preventing the plasma generating part 110 from being damaged. However, the pair of doors 114a are not limited to the embodiments but may have various shapes and can be variously engaged.

The flow rate measuring unit 120 is installed outside the pipe 10. When the length of the pipe 10 is long, a plurality of the flow velocity measuring units 120 may be installed at regular intervals or at predetermined intervals in the longitudinal direction of the pipe 10. [ The flow velocity measuring unit 120 has a measurement rod 122 installed inside the pipe 10 so as to measure the flow rate of seawater passing through the pipe 10. At the end of the measuring rod 122, a flow rate measuring sensor is provided, and the measuring rod 122 is extended so that the flow rate measuring sensor is located at the center of the pipe 10. The flow rate of the seawater can not be accurately measured due to the influence of the scale 1 and the flow rate of the seawater can not be accurately measured due to the friction between the inner circumferential surface of the pipe 10 and the seawater when the flow rate measuring sensor is positioned close to the inner circumferential surface of the pipe 10. [ A flow velocity measurement of a different magnitude from the velocity at the center of the flow velocity can be obtained. Therefore, by allowing the flow velocity sensor to be positioned at the center of the pipe 10, the flow velocity of the seawater passing through the pipe 10 can be accurately detected.

The control unit 130 includes input means such as a keyboard, a pointing device, a microphone, a joystick, and a scanner, and output means such as a monitor display, a speaker, and a printer. Also, it includes storage means for receiving and storing information inputted through the input means, for example, flow velocity reference value, and calculation means for comparing the flow velocity reference value with the flow velocity measurement value measured by the flow velocity measurement unit 120.

Referring to FIG. 7, in the process of producing fresh water through seawater desalination, a scale 1 is generated and fixed inside the pipe 10. The flow velocity of the seawater passing through the pipe 10 by the scale 1 fixed to the pipe 10 is faster than when the scale 1 is not fixed. When the seawater desalination plant is operated, the flow rate measuring unit 120 installed in the piping 10 periodically measures the flow rate of seawater in the piping 10. The measurement period of the flow velocity measurement unit 120 can be set through the control unit 130. [ When the flow velocity measurement value is equal to or greater than the flow velocity reference value, it is determined that the scale 1 is stuck to such an extent that removal is necessary, and the plasma generator ( 110 is started. After the pair of doors 114a of the door part 114 are opened in the through hole 11 and the nozzle 111a of the plasma generating part 110 is extended through the through hole 11, Exposed. The plasma beam P is ejected into the pipe 10 while rotating the nozzle 11a. A plasma beam P composed of ionized oxygen gas has an atomic group, that is, a radical, having electrons that can not be matched due to the breakage of the bond of the compound. Free radicals are reactors that have the remaining electrons and can easily react to any material. In an embodiment, the plasma beam P comprises at least one of superoxide radicals and hydroxyl radicals, which are highly reactive reactive oxygen species. This plasma beam P reacts with the scale 1 fixed to the inner surface of the pipe 10 to release the fixed state of the scale 1. Therefore, the plasma beam P can be jetted to the inside of the pipe 10 to remove the scale 1 generated in the seawater desalination process.

Hereinafter, a scale removal method using the scale removal apparatus according to an embodiment of the present invention will be described.

Referring to FIG. 8, a scale removal method according to an embodiment of the present invention includes steps of measuring a flow rate of seawater in a pipeline (S10), comparing a measured flow rate of the seawater to a set flow rate reference value, (S30) of opening a door portion provided in a through hole of the pipe when the flow velocity measurement value is larger than the flow velocity reference value, advancing the nozzle through the opened through hole to generate a plasma beam and injecting the plasma beam into the inside of the pipe (S40) . In addition, a step S50 of measuring the flow rate of the in-pipe water in the process of spraying the plasma beam to check the degree of scale removal, a step S60 of comparing the flow velocity measurement value and the flow velocity reference value again, Stopping the generation of the plasma beam when the value is smaller than the flow velocity measurement value, retracting the nozzle to the through hole (S70), and closing the door portion (S80). In the step S60 of comparing the flow velocity measurement value and the flow velocity reference value again, if the flow velocity measurement value is equal to or greater than the flow velocity measurement value, the controller determines that the scale has not been removed to the set degree and continues to generate the plasma beam. As described above, the degree of generation of scale in the piping is continuously checked during the desalination process, and when it exceeds the reference value, the inside of the piping can be prevented from being narrowed by the scale. That is, it is possible to prevent the deterioration of the productivity of the seawater desalination process by smoothly flowing the seawater in the piping.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It will be obvious to those with knowledge.

1: scale 10: piping
11: Through-hole 100: Scale removal device
110: plasma generating part 111: container
111a: nozzle 111b: direction switching means
112: power supply 113: gas supply
114: Door part 114a: Door
120: flow rate measuring unit 122: measuring rod
130:

Claims (8)

A flow velocity measuring unit for measuring a flow velocity of the seawater passing through the piping installed in the seawater desalination plant,
At least one plasma generating unit for generating a plasma beam for removing a scale including chloride formed in the pipe,
And a controller for controlling the plasma generator by comparing the flow velocity measured by the flow velocity measuring unit with the set flow velocity,
Wherein the pipe has a through-hole through which the plasma generating unit is installed, and the through-hole is provided with a door portion opened and closed by a pair of doors,
Wherein the controller is configured to discharge the plasma beam generated by the plasma generator to the inside of the pipe when the flow velocity measured by the flow velocity measuring unit is greater than or equal to the flow velocity set through the controller
Descaling device. delete 2. The apparatus of claim 1, wherein the plasma beam comprises at least one of a superoxide radical and a hydroxyl radical. delete The descale apparatus according to claim 1, wherein the flow rate measuring section includes a measuring rod for positioning a flow rate measuring sensor at the center of the pipe. Measuring the flow rate of seawater passing through the piping installed in the seawater desalination plant,
Comparing the measured flow rate value of the seawater to a set flow rate value;
Opening the door portion provided in the through-hole of the pipe when the measured flow rate value is equal to or greater than the set flow rate value;
Discharging a nozzle of the plasma generating unit into the pipe through the opened through-hole to generate a plasma beam and injecting the plasma beam into the pipe;
Measuring the flow rate of the seawater again,
Comparing the measured flow velocity value again with a set flow velocity value,
If the measured flow velocity value is greater than or equal to the set flow velocity value, continuously discharges the plasma beam into the interior of the pipe, and if the measured flow velocity value is less than the preset flow velocity value, Stopping the ejection of the nozzle and retracting the nozzle into the through-hole,
And closing the door portion
Scale removal method. 7. The method of claim 6, wherein the scale comprises chloride produced in a seawater desalination process. 8. The method of claim 7, wherein the plasma beam comprises at least one of a superoxide radical and a hydroxyl radical chemically reacting with the scale.
KR1020130017650A 2013-02-19 2013-02-19 Apparatus and method for removing scale KR101419015B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160095880A (en) * 2015-02-04 2016-08-12 레인보우스케이프주식회사 Washing system using plasma and laser for the tunnel or any other walls
EP4123054A1 (en) * 2021-07-19 2023-01-25 Siemens Gamesa Renewable Energy A/S Offshore wind turbine with a fluid supply assembly comprising a cleaning unit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH069021Y2 (en) * 1988-02-26 1994-03-09 新日本製鐵株式会社 Descaling device for steel strip by plasma
KR20010093459A (en) * 2000-03-29 2001-10-29 신현준 Different thing removing apparatus for the speed of a current measurement system and its method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH069021Y2 (en) * 1988-02-26 1994-03-09 新日本製鐵株式会社 Descaling device for steel strip by plasma
KR20010093459A (en) * 2000-03-29 2001-10-29 신현준 Different thing removing apparatus for the speed of a current measurement system and its method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160095880A (en) * 2015-02-04 2016-08-12 레인보우스케이프주식회사 Washing system using plasma and laser for the tunnel or any other walls
KR101682409B1 (en) * 2015-02-04 2016-12-05 레인보우스케이프주식회사 Washing system using plasma and laser for the tunnel or any other walls
EP4123054A1 (en) * 2021-07-19 2023-01-25 Siemens Gamesa Renewable Energy A/S Offshore wind turbine with a fluid supply assembly comprising a cleaning unit
US11926910B2 (en) 2021-07-19 2024-03-12 Siemens Gamesa Renewable Energy A/S Offshore wind turbine with a fluid supply assembly comprising a cleaning unit

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