KR20220055810A - Cleaning-ball manufacturing method for condenser tube of power plant - Google Patents

Abstract

The present invention provides a method for manufacturing a sponge ball for washing a condenser. The method for manufacturing the sponge ball for washing the condenser includes: a raw material mixing process of mixing natural rubber or synthetic natural rubber with zinc oxide, a stearic acid, sulfur, an organic foaming agent, a process oil, and silica; a bubble removal process of forming a synthetic rubber plate by introducing a mixture obtained by mixing raw materials with each other into a roll mixer, and removing bubbles while applying heat to the mixture; a foamed sponge molding process of forming a foamed sponge member by injecting the synthetic rubber plate into a mold and performing foaming; a sponge cutting process of forming a polygonal sponge having a polyhedral shape by cutting a foamed sponge into a specific size; and a polygonal sponge polishing process of molding a spherical sponge ball by polishing a surface of the polygonal sponge to remove a skin layer. Therefore, according to the present invention, a process of polishing a polygonal sponge cut in a square shape into a circular shape is rapidly performed, and rapid processing is performed while minimizing defects during the polishing process.

Description

Manufacturing method of sponge ball for condenser cleaning {CLEANING-BALL MANUFACTURING METHOD FOR CONDENSER TUBE OF POWER PLANT}

The present invention relates to a method for manufacturing a sponge ball for cleaning condensate, and more particularly, it is possible to quickly perform the process of grinding a polygonal sponge cut into a square shape in a circular shape, and it can be processed quickly while minimizing defects in the grinding process. It relates to a method of manufacturing a sponge ball for cleaning a condenser that allows

In general, nuclear power plants and thermal power plants are provided with a cooling system for cooling the steam used to obtain the power to a constant temperature. In the cooling system, river water or sea water is used as a cooling water source having a plurality of tubes.

Specifically, in the condenser installed in the power generation facility, waste steam generated when the steam turbine is driven flows in and comes into contact with the outer surface of the cold cooling water pipe to reduce the steam to water through mutual heat exchange and supply it back to the boiler, so that the power generation facility It is the facility that has the greatest influence on the electrical output and thermal efficiency of

In addition, hundreds to thousands of cooling water pipes through which seawater flows into the condenser for heat exchange between waste steam and seawater are installed in the condenser depending on the power generation capacity of the turbine.

In addition, since the condenser has only one direction of supply of seawater supplied to the cooling water pipe (tube), scale occurs such as fish and shellfish entering or inhabiting the cooling water pipe during long-time operation. The generation of such scale reduces the flow rate of the incoming seawater, thereby lowering the cooling efficiency.

Accordingly, a cleaning device for removing scale from the cooling water pipe is required, and the washing ball is circulated into the cooling water pipe through the cleaning device to remove the scale.

The cleaning ball is mainly made of natural rubber, butyl rubber, chloroprene rubber, styrene-butadiene rubber, urethane rubber, etc. to have appropriate flexibility, elasticity, and abrasion resistance, and is compressed when an external force is applied to function.

The cleaning ball has a diameter equal to or slightly larger than the inner diameter of the tube, and the scale is removed while circulating the tube according to the flow of coolant, and abrasion occurs continuously through this scaling process. And the worn cleaning balls are replaced at specific intervals.

A conventional cleaning ball must have excellent flexibility, elasticity, and abrasion resistance, and must have a compressive strength suitable for cleaning the cooling water pipe. A sponge foamed with synthetic rubber such as rubber is used.

A sponge is manufactured by adding a crosslinking agent, a crosslinking accelerator, an antiaging agent, a softening agent, a filler, and a foaming agent to natural or synthetic rubber, and filling a mold with a compound uniformly dispersed in the rubber by the Soviet Union and kneading, then heating it to crosslink and foam. do.

However, in the sponge ball of the prior art as described above, the air bubbles are not completely removed during the manufacturing process, so after foaming, the pores are formed too large, and the moisture content is lowered due to the non-uniformity of the cell size (porosity) as well as the durability is lowered. There is a problem.

Therefore, there is a need to improve it.

Meanwhile, Korean Patent Laid-Open Publication No. 10-2018-0092646 (published on August 20, 2018) discloses "a sponge ball impregnated with a hydrophilic gas and a method and apparatus for encapsulating the same".

The present invention was created by the necessity as described above, and it provides a method for manufacturing a sponge ball for cleaning condensers that can improve productivity by rapidly polishing while minimizing defects when polishing a polygonal sponge cut into a polygonal shape in a circular shape. Its purpose is to provide

In order to achieve the above object, the method for manufacturing a sponge ball for cleaning condensate according to an aspect of the present invention includes natural rubber or synthetic natural rubber, zinc oxide, stearic acid, sulfur, and an organic foaming agent. (Organic blowing agent), process oil (Process oil), a raw material mixing process of mixing silica (Nipsil VN3), and the mixture of the raw materials is put into a roll mixer to remove air bubbles while applying heat to make a synthetic rubber plate A foam removing process of forming a foaming sponge forming process of forming a foamed sponge member by putting the synthetic rubber plate into a mold and foaming, and a sponge cutting process of cutting the foamed sponge to a specific size to form a polyhedral polygonal sponge and a polygonal sponge polishing step of forming a spherical sponge ball while removing the skin layer by polishing the surface of the polygonal sponge.

In addition, in the present invention, the polygonal sponge polishing process includes inserting a plurality of fixed needles into the polygonal sponge to fix the polygonal sponge, and moving the fixed needles to a rotating grinder to make a spherical shape, then the polished sponge is separated, and the spherical sponge ball is formed by cutting the part where the fixed needle has been inserted.

As described above, in the method for manufacturing a sponge ball for cleaning condensers according to one aspect of the present invention, unlike the prior art, when a polygonal sponge cut into a square is polished in a circular shape, it is possible to quickly polish it, thereby improving productivity. have an effect

In addition, the method for manufacturing a sponge ball for cleaning condensate according to the present invention has the effect of rapidly polishing while minimizing defects because the polygonal sponge is fixed to a fixed needle and then moved to a rotating polishing machine and polished in a spherical shape.

1 is a schematic diagram for explaining a condenser of a power plant according to an embodiment of the present invention.
2 is a flowchart illustrating a method of manufacturing a sponge ball for cleaning condensate according to an embodiment of the present invention.
3 is a schematic diagram for explaining a method of manufacturing a sponge ball for cleaning condensate according to an embodiment of the present invention.
4 is a schematic diagram for explaining a polishing process according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of a method for manufacturing a sponge ball for cleaning condensate according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a schematic diagram for explaining a condenser of a power plant according to an embodiment of the present invention, and FIG. 2 is a flowchart for explaining a method of manufacturing a sponge ball for cleaning a condenser according to an embodiment of the present invention.

In addition, FIG. 3 is a schematic diagram for explaining a method of manufacturing a sponge ball for cleaning condenser according to an embodiment of the present invention, and FIG. 4 is a schematic diagram for explaining a polishing process according to an embodiment of the present invention.

First, referring to FIG. 1, the condenser of the power plant connects the cooling water inlet 23 and the cooling water outlet 25 to remove scale from the inner wall of the cooling tube 21 using the sponge ball 10, , the sponge ball 10 is continuously circulated to clean the cooling tube 21 .

Here, the cooling water discharge unit 25 of the condenser is provided with a screen member 27 for guiding the cleaning ball operation automatic system 100 in the condenser tube while preventing the loss of the sponge ball 10 .

In addition, the condenser of the power plant includes a ball collecting unit 110 , a ball sorting count unit 120 , a defective ball collecting unit 130 , a ball replenishment supply unit 140 , a circulation pump 150 , and a surge tank. 160 and a driving control unit 170 .

In addition, the condenser of the power plant may continuously perform cleaning operation, sorting operation, counting operation, and ball replenishment supply operation. The supplementary supply unit 140 , the circulation pump 150 and the surge tank 160 are controlled by the operation control unit 170 .

In particular, the condenser of the power plant is connected to the cooling water discharge unit 25 through which the sponge ball 10 is circulated and discharged to remove foreign substances from the cooling tube 21, so that the amount of wear among the sponge balls 10 10) is selected and separated.

As shown in FIGS. 2 to 4, the sponge ball 10 used in the cooling tube 21 is a raw material mixing process (S10), a bubble removal process (S20), and a foamed sponge forming process (S30). And, a sponge cutting process (S40), and is manufactured through a polygonal sponge polishing process (S50).

In addition, the sponge ball 10 is manufactured in a spherical shape having elasticity through a foaming process such as a polymer compound resin or synthetic rubber, and is formed to have voids (porosity) between the sponge structures during the foaming process. Since the sponge ball 10 manufactured through such a manufacturing method is foamed and manufactured in a state where air bubbles are completely removed in the process of mixing the raw materials, the cell size (porosity) is uniformly manufactured, and the moisture content is improved, Durability is improved.

In the raw material mixing process (S10) according to this embodiment, other raw materials are mixed with natural rubber or synthetic natural rubber. For example, in the raw material mixing process (S10), natural rubber or synthetic natural rubber, zinc oxide, stearic acid, sulfur, organic blowing agent, process oil, silica (Nipsil VN3).

In this embodiment, SVR-3L (Standard Vietnam Rubber) can be used as the natural rubber.

In addition, in this embodiment, a mixture of natural rubber and synthetic rubber may be used.

Here, as the synthetic rubber, butyl rubber, chloroprene rubber, butadiene rubber, high styrene, rubber, nitrile rubber, urethane rubber, acrylic rubber, silicon rubber and the like can be used.

For example, in this embodiment, 80% by weight of SVR-3L (Standard Vietnam Rubber) as natural rubber and 20% by weight of BR (polybutadiene rubber) as synthetic rubber may be used as mixed rubber in this embodiment.

In this embodiment, the organic blowing agent is diazoaminobenzene, azobis(isobutyronitrile), dinitrosopen tamethylenetetramine, N,N'-dinitro-N,N'-dimethylterephthal Amide, azodicarbon amide, sulfonyl hydrazide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, p, p'_oxybis (benzenesulfonyl hydrazide), p-toluenesulfonyl semicarbazide Any one or a mixture of one or more may be used.

For example, in this embodiment, any one of CELLCOM-ACY/E, UNICELL-DL75N, and OBSH may be used as the organic foaming agent.

Here, OBSH (P,P'-oxybis(benzene sufonyl hydrazide)) has excellent loading stability like AC, but it is not well dispersed in polymer, so it is surface treated with a small amount of mineral oil to improve dispersibility. , EPDM W/S, etc. TSH (P-toluene sulfonyl hydrazide) first dissolves at 170°C and decomposes rapidly at 145~150°C, which is different from the rapid decomposition after dissolution of OBSH and DPT blowing agents.

Specifically, the raw material mixing process (S10) according to this embodiment was performed with respect to 100 parts by weight of synthetic natural rubber in which 80% by weight of SVR-3L (Standard Vietnam Rubber) and 20% by weight of BR (polybutadiene rubber) were mixed. Oxide) 4 parts by weight, stearic acid 2 parts by weight, sulfur 5 parts by weight, organic blowing agent OBSH 20 parts by weight, process oil 15 parts by weight, silica (Nipsil VN3) 30 parts by weight The parts are mixed and blended.

In this embodiment, the sponge ball 10 may have a density of 0.356 g/cm3 to 0.418 g/cm3.

In the bubble removal process (S20) according to this embodiment, the mixture blended in the raw material mixing process (S10) is put into a roll mixer and compressed while applying heat to remove air bubbles to form the synthetic rubber plate material 30 .

At this time, the bubble removal process (S20) removes bubbles while repeatedly passing through the roll mixer while maintaining the temperature of the mixture at 80 ° C., and finally the thickness of the synthetic rubber plate 30 discharged from the roll mixer ( t1) is molded to 1 cm. This is to improve the foaming rate when performing the foaming sponge molding process (S30).

In the foamed sponge forming process ( S30 ), the synthetic rubber plate material 30 is put into a mold, and heat is applied to form the foamed sponge member 40 . At this time, the foamed sponge member 40 formed in the foaming sponge forming process (S30) has a thickness t2 of 3.5 cm or more. And a skin layer is formed on the surface of the foam sponge member 40 formed in the foam sponge molding step (S30).

In the sponge cutting process ( S40 ), the foamed sponge member 40 is cut to a specific size to form a polyhedral polygonal sponge 50 . This is to easily form the spherical sponge ball 10 .

The polygonal sponge 50 formed in the sponge cutting process (S40) is cut into a hexahedral shape, and is formed into a spherical sponge ball 10 through the polygonal sponge polishing process (S50).

In the polygonal sponge polishing process (S50), the polygonal sponge 50 is polished using a grinder to form the spherical sponge ball 10 . Specifically, in the polygonal sponge polishing step (S50), the polygonal sponge 50 is fixed to the sponge fixing frame 101, and the sponge fixing frame 101 is transferred to the rotating polishing machine 103 to grind the polygonal sponge 50 in a spherical shape. do (S51).

At this time, the sponge fixing frame 101 is provided with a plurality of fixing needles 101a for stably fixing the polygonal sponge 50, and the polishing machine 103 has a semicircular polishing groove 105a.

Then, the spherical sponge 10a polished from the sponge fixing frame 101 is separated, and the protrusion 10b formed by the insertion of the fixing needle 101a is cut to form the sponge ball 10 (S53).

In the polygonal sponge polishing process (S50) according to the present embodiment, the diameter of the sponge ball 10 is formed in a range of 22 mm to 27 mm. In this way, to form the sponge ball 10 by grinding the polygonal sponge 50 is to remove the skin layer formed on the outer surface to improve the water effect.

In the method for manufacturing a sponge ball for cleaning condensate according to an embodiment of the present invention configured as described above, the synthetic rubber plate 30 is manufactured while mixing the raw materials and passing the mixture through a roll mixer to remove air bubbles. When the sponge ball 10 is manufactured by foaming (30), the cell size (porosity) of the sponge ball 10 is uniformly formed, thereby improving the durability while improving the moisture content.

Unlike the prior art, the method for manufacturing a sponge ball for cleaning condensate according to an aspect of the present invention has the effect of improving productivity by rapidly polishing when a polygonal sponge cut into a square is polished in a circular shape.

In addition, the method for manufacturing a sponge ball for cleaning condensate according to the present invention has the effect of rapidly polishing while minimizing defects because the polygonal sponge is fixed to a fixed needle and then moved to a rotating polishing machine and polished in a spherical shape.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely an example, and those skilled in the art to which various modifications and equivalent other embodiments are possible. will understand

Accordingly, the true technical protection scope of the present invention should be defined by the claims.

10: sponge ball 20: avenger
21: cooling tube 50: polygonal sponge
110: ball collecting unit 27: screen member
120: ball sorting count unit 130: ball amount ball transfer line
140: ball supplement supply 150: circulation pump
160: surge tank 170: operation control unit

Claims (2)

Raw material mixing process of mixing natural rubber or synthetic natural rubber, zinc oxide, stearic acid, sulfur, organic blowing agent, process oil, and silica (Nipsil VN3) ;
a bubble removal process of adding a mixture of the raw materials to a roll mixer to remove air bubbles while applying heat to form a synthetic rubber plate;
a foaming sponge molding step of forming a foamed sponge member by putting the synthetic rubber sheet into a mold and foaming;
a sponge cutting process of cutting the foamed sponge to a specific size to form a polyhedral polygonal sponge; and
a polygonal sponge polishing step of forming a spherical sponge ball while removing the skin layer by polishing the surface of the polygonal sponge;
A method of manufacturing a sponge ball for cleaning condensate, comprising a.
The method of claim 1,
In the polygonal sponge polishing process, a plurality of fixed needles are inserted into the polygonal sponge to fix the polygonal sponge, the fixed needle is moved to a rotating grinding machine to be polished in a spherical shape, and then the polished sponge is separated, and the A method of manufacturing a sponge ball for cleaning condensate, characterized in that the spherical sponge ball is formed by cutting the part where the fixed needle was inserted.

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