KR20210141800A - Expansion joint for heat recovery steam generator - Google Patents

Abstract

The present invention relates to an expansion joint pipe for an exhaust heat recovery boiler. In order to operate in conjunction with movement of a pipe of the exhaust heat recovery boiler caused by water expansion or vibration of the pipe of the exhaust heat recovery boiler, a cover unit is connected to a flange unit by welding or bolting, so that heat of the pipe is blocked from being exposed to the outside. Therefore, damage to and separation of an insulation portion of an expansion and contraction unit are prevented, and durability and safety of the expansion joint pipe are improved. The expansion joint pipe for an exhaust heat recovery boiler also increases a lifespan and reduces maintenance costs. Heat loss of the exhaust heat recovery boiler is minimized and operating efficiency is maximized. Stability and reliability of the exhaust heat recovery boiler can be improved. The expansion joint pipe for the exhaust heat recovery boiler of the present invention comprises: the expansion and contraction unit; a flange unit; and a cover unit.

Description

Expansion joint for heat recovery steam generator

The present invention relates to an expansion joint pipe for a heat recovery boiler, and more particularly, the cover part is attached to the flange so that it behaves in conjunction with the movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler. It is installed through welding or bolting to prevent the heat of the pipe from being exposed to the outside, preventing damage and separation of the insulation part of the expansion and contraction part, thereby improving the durability and safety of the expansion joint pipe, increasing the lifespan, and maintaining the maintenance cost. It relates to an expansion joint pipe for a heat recovery boiler that can reduce energy consumption, maximize the operational efficiency by minimizing the heat loss of the heat recovery boiler, and improve the stability and reliability of the heat recovery boiler.

In general, combined cycle power generation systems generate high-pressure, high-temperature combustion gas by burning fuel, and a gas turbine system that generates electricity by driving a gas turbine using this high-temperature and high-pressure combustion gas, and combustion gas that is discharged after driving the gas turbine It consists of a heat recovery boiler that recovers the heat of the heat recovery boiler, and a steam turbine system that generates electricity by driving a steam turbine using high-temperature and high-pressure steam generated from the heat recovery boiler.

In general, exhaust gas discharged after generating power in a gas turbine of a generator contains a high temperature of about 530 degrees Celsius and a lot of energy accordingly. Discharge of such high-temperature energy to the atmosphere results in significant energy loss, so a heat recovery boiler is used to recover energy from exhaust gas.

That is, a heat recovery steam generator (HRSG) is one of the core facilities along with gas turbines and steam turbines in combined cycle power plants and cogeneration power plants. ), etc., is a steam generator that produces steam for steam turbines by recovering the heat of high-temperature exhaust gas generated while operating a gas turbine.

In general, a heat recovery boiler includes a casing and a plurality of heat transfer tubes disposed inside the casing. The casing has a substantially cubic shape, and the heat pipe group is divided into a superheater, an evaporator, etc. according to their role.

Also, in general, heat exchange in the heat recovery boiler is performed in the half module of the heat recovery boiler. The half module aligns a plurality of tubes in a plurality of rows along the direction in which the exhaust gas flows. The tube may be a fin tube to which a heat radiation fin advantageous for heat exchange is attached.

In general, since the tube of the heat recovery boiler is operated in contact with superheated steam for a long time in a high temperature and high pressure environment, the inner surface of the tube is oxidized and scale is generated. Scale build-up on the tube inner surface of a heat recovery boiler is caused by a chemical action between the steam and the tube wall due to local overheating.

In addition, in general, an expansion joint is a device that connects a pipe and another pipe and absorbs vibration or shock transmitted to the pipe. This expansion joint has a pair of flanges connected to the pipe and an expansion/contraction part made of a rubber or metal material formed between both flanges, so that some expansion and contraction between both pipes is possible to absorb the shock transmitted to the pipe. have.

Therefore, expansion or mechanical vibration due to heat or pressure occurs in various engineering pipes. Expansion joint pipes are widely applied for the purpose of absorbing such thermal expansion or vibration. For example, it is common that these expansion joints are applied to many fields such as power plants, petrochemicals, refrigeration, metallurgy, nuclear power, air conditioning systems, aviation, construction, automobiles, water treatment, and incinerators.

These expansion joints are deformed to be bent as the use continues. There are various factors, but in particular, there is a sagging phenomenon due to aging of the stretchable part.

Also, in general, the heat recovery boiler is a long and high single body, and has a structure in which a number of block-type heat recovery devices are stacked inside. It is possible to stop the operation of the entire required recovery device and perform partial repair or replacement of parts.

1 to 3, the conventional expansion joint pipe 1 for a heat recovery boiler was installed to surround the pipe 2 of the heat recovery boiler.

Conventional expansion joint pipe for heat recovery boiler is installed with the upper part of expansion joint pipe open and installed to pipe of heat recovery boiler. When the pipe of heat recovery boiler moves due to water expansion or vibration, the heat was transferred to the insulation of the expansion joint as it is, and there was a problem that the insulation part was damaged or damaged.

In addition, as the conventional expansion joint pipe for heat recovery boiler is coupled to the pipe of the heat recovery boiler with the upper part of the expansion joint pipe open, the metal part of the expansion joint pipe is damaged by hardening by heat due to damage to the insulation part. As a result, durability is lowered, and ultimately the lifespan is lowered, which consumes a lot of money and time for maintenance and replacement, and there are problems in that the safety and reliability of the heat recovery boiler are lowered, and safety accidents increase.

Furthermore, as the conventional expansion joint pipe for a heat recovery boiler is coupled to the pipe of the heat recovery boiler with the upper part of the expansion joint open, heat leaks from the pipe to the outside and heat loss occurs, and the operating efficiency of the heat recovery boiler decreased, and there was a problem of causing resource wastage.

Besides. Conventional expansion joints for heat recovery boilers have a problem of increasing the risk of safety accidents and causing inconvenience to workers due to frequent maintenance.

Korean Patent Publication No. 10-2020-0011771 Korean Patent Publication No. 10-2016-0033281 Korean Patent Publication No. 10-2018-0129380 Korean Patent Registration Publication No. 10-1241278 Korean Patent Publication No. 10-2016-0064162

The present invention is to solve the above problems, and an object of the present invention is to attach the cover to the flange so that it behaves in conjunction with the movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler. It is installed through welding or bolting to prevent the heat of the pipe from being exposed to the outside, preventing damage and separation of the insulation part of the expansion and contraction part, thereby improving the durability and safety of the expansion joint pipe, increasing the lifespan, and maintaining the maintenance cost. The purpose of this project is to provide an expansion joint for a heat recovery boiler that can reduce energy consumption, maximize the operating efficiency by minimizing the heat loss of the heat recovery boiler, and improve the stability and reliability of the heat recovery boiler.

In order to achieve the object of the present invention, an expansion joint pipe for a heat recovery boiler according to the present invention comprises: an expansion and contraction part which is coupled and installed to a part of the pipe of the heat recovery boiler so as to be stretchable; a flange portion formed at one end of the stretchable portion; and a cover part that is detachably coupled to the flange part and operates in conjunction with movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler.

Further, in another preferred embodiment of the expansion joint for a heat recovery boiler according to the present invention, the cover portion of the expansion joint for the heat recovery boiler includes a housing part; a shielding part having a through hole through which the pipe of the heat recovery boiler is disposed and formed in a disk shape to shield an open part between the pipe of the heat recovery boiler and the expansion and contraction part; and a plurality of control units installed inside the housing unit to control the behavior of the shielding unit in conjunction with the movement of the piping of the heat recovery boiler.

In addition, in another preferred embodiment of the expansion joint for the heat recovery boiler according to the present invention, the adjusting part of the cover part of the expansion joint for the heat recovery boiler is spaced apart at an angle of 90 degrees based on the center of the cover part inside the housing part. So 4 can be installed.

Further, in another preferred embodiment of the expansion joint for a heat recovery boiler according to the present invention, the housing part of the cover of the expansion joint for the heat recovery boiler includes a lower base part extending in a horizontal direction; an upper base part extending in a horizontal direction so as to be parallel to each other while being spaced apart from the lower base part in a vertical direction; and a connecting part extending in a vertical direction between the lower base part and the upper base part.

In addition, in another preferred embodiment of the expansion joint for the heat recovery boiler according to the present invention, the adjusting part of the cover part of the expansion joint for the heat recovery boiler extends in the horizontal direction so as to be slidable in the horizontal direction from the upper surface of the lower base part. a lower guide portion formed; an upper guide part spaced apart from the lower guide part in a vertical direction, parallel to each other, and extending in a horizontal direction to be slidable in a horizontal direction from a lower end surface of the upper base part; a support part extending in a vertical direction between one side of the lower guide part and one side of the upper guide part so as to face and parallel the connection part in a horizontal direction; and a pressing part installed between the support part and the connection part to elastically press the shielding part.

Expansion joint pipe for heat recovery boiler according to the present invention has the cover part through mounting welding or bolting on the flange so that it behaves in conjunction with the movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler. As the shielding part moves in close contact with the pipe by the operation part according to the movement of the pipe, it prevents the heat of the pipe from being exposed to the outside and prevents damage and separation of the insulation part of the expansion and contraction part, thereby improving the durability of the expansion joint pipe. It has the effect of improving safety and increasing the lifespan.

In addition, in the expansion joint pipe for a heat recovery boiler according to the present invention, the cover part is coupled to the flange so that it behaves in conjunction with the movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler. As the shielding part operates in conjunction with the pipe by the operation part according to the movement, there is an effect of reducing the maintenance cost of the expansion joint pipe and promoting the convenience of the operator.

Moreover, the expansion joint pipe for a heat recovery boiler according to the present invention has the effect of maximizing the operating efficiency of the heat recovery boiler by minimizing the heat loss of the heat recovery boiler and preventing the waste of resources.

In addition, the expansion joint for a heat recovery boiler according to the present invention has the effect of improving the stability and reliability of the heat recovery boiler by minimizing damage to the expansion joint, and preventing safety accidents in advance.

1 is a cross-sectional view illustrating the concept of an expansion joint pipe for a heat recovery boiler installed on a pipe of a conventional heat recovery boiler.
2 and 3 show photographic data on the damage and damage state of the expansion joint pipe for the heat recovery boiler installed in the pipe of the conventional heat recovery boiler.
4 is a cross-sectional view for explaining the concept of an expansion joint for a heat recovery boiler according to the present invention installed on a pipe of the heat recovery boiler.
5 is a transparent plan view of an expansion joint for a heat recovery boiler according to the present invention.
6 shows a photo of a prototype of an expansion joint for a heat recovery boiler according to the present invention.

Hereinafter, with reference to the drawings of the expansion joint for a heat recovery boiler according to an embodiment of the present invention will be described in detail. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers refer to like elements throughout.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

The terminology used herein is for the purpose of describing the embodiments, and thus is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

4 is a cross-sectional view illustrating the concept of an expansion joint for a heat recovery boiler according to the present invention installed on a pipe of a heat recovery boiler, and FIG. 5 is a transparent plan view of the expansion joint for a heat recovery boiler according to the present invention. , Figure 6 shows a photo of a prototype of an expansion joint for a heat recovery boiler according to the present invention.

Definitions of terms used below are as follows. "Horizontal direction" means a horizontal direction in the same member, that is, the X-axis direction in FIG. 4, and "vertical direction" means a vertical direction in the same member while orthogonal to the horizontal direction, that is, the Y-axis direction in FIG. In addition, "upper (upper)" means an upward direction in the vertical direction, that is, a direction toward the upper side of the Y-axis in FIG. means the direction it is going. In addition, "inside (inside)" means a side relatively close to the center of the same member, that is, the inside in FIGS. to the outside in FIG. 6 . In addition, "one end" means the upper end in the vertical direction in the same member, and "the other end" means the lower end in the vertical direction in the same member. In addition, "one side" means the end of either side in the horizontal direction in the same member, and "the other side" means the end of the other side opposite to the one side in the horizontal direction in the same member. That is, for example, in FIG. 4 , one side refers to the left or right end of the horizontal horizontal direction, and the other side refers to the right end when the other side is the left end.

An expansion joint pipe 10 for a heat recovery boiler according to the present invention will be described with reference to FIGS. 4 to 6 . 4 to 6 , the expansion joint pipe 10 for a heat recovery boiler according to the present invention includes an expansion and contraction part 100 , a flange part 200 , and a cover part 300 .

The expansion/contraction part 100 is installed and coupled to a part of the pipe 2 of the heat recovery boiler so as to be expandable and contractible. That is, the expansion and contraction unit 100 is installed to surround a part of the pipe 2 of the heat recovery boiler or connect one end and the other end of the pipe 2 of the heat recovery boiler or one side and the other side of the pipe 2 of the heat recovery boiler. In addition, the stretchable part 100 is expanded and contracted by having a corrugated pipe part formed of a metal or rubber material.

The flange part 200 is formed at one end of the expansion and contraction part. That is, specifically, the flange part 200 is formed to protrude radially from the upper end of the stretchable part 100 to the outside of the stretchable part, and performs a function of coupling to or supporting other supporting devices of the heat recovery boiler.

The cover part 300 is detachably coupled to the flange part 200 and operates in conjunction with the movement of the pipe 2 of the heat recovery boiler caused by water expansion or vibration of the pipe 2 of the heat recovery boiler. . That is, the cover part 300 is installed to be detachably coupled to the flange part 200 through welding, bolts, rivets, etc., and when the high-temperature and high-pressure gas flows along the pipe according to the operation of the heat recovery boiler, the high-temperature and high-pressure gas It covers the open part between the pipe and the expansion and contraction part while acting in conjunction with the movement of the pipe 2 of the heat recovery boiler caused by water expansion or vibration of the pipe 2 of the heat recovery boiler.

As such, in the expansion joint for a heat recovery boiler according to the present invention, the cover part is welded or bolted to the flange so that the cover part behaves in conjunction with the movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler. As the shielding part behaves in close contact with the pipe by the operation part according to the movement of the pipe, it prevents the heat of the pipe from being exposed to the outside and prevents damage and separation of the insulation part of the expansion and contraction joint. It can improve durability and safety, and increase the lifespan of expansion joints.

4 and 6, the cover part 300 of the expansion joint 10 for a heat recovery boiler according to the present invention includes a housing part 310, a shielding part 320, and an adjusting part 330. include

The housing portion 310 is formed in a cylindrical shape having a cavity formed therein as a whole and having a predetermined height and volume to form an outer shape of the cover portion. In addition, the housing part provides a space in which the shielding part and the adjusting part are installed.

4 and 6, the housing part 310 of the cover part 300 of the expansion joint pipe 10 for a heat recovery boiler according to the present invention has a lower base part 311 and an upper base part 312. , and a connection part 313 .

The lower base part 311 is formed to extend in the horizontal direction. That is, the lower base portion 311 is a portion coupled to the upper surface of the flange portion 200 and is formed to extend to have a predetermined length L in the horizontal direction.

The upper base part 312 is vertically spaced apart from the lower base part and extends in a horizontal direction so as to be parallel to each other. That is, the upper base part 312 is formed to extend to have a predetermined length in the horizontal direction so as to be parallel to each other while being spaced apart from the lower base by a predetermined distance in the vertical direction. At this time, for convenience and speed of manufacture, the horizontal length of the upper base and the horizontal length of the lower base may be formed to be the same.

The connection part 313 is formed extending in the vertical direction between the lower base part 311 and the upper base part 312 . That is, the connection part 313 is formed extending in the vertical direction between the lower base part and the upper base part so that one end of the connection part engages with the other lower surface of the upper base part and the other end of the connection part engages with the other upper surface of the lower base part.

The shielding part 320 is provided with a through groove 321 through which the pipe 2 of the heat recovery boiler is disposed, and is formed in the form of a disk, so that the opening part between the pipe 2 of the heat recovery boiler and the expansion and contraction part 100 ( 110) is shielded. That is, the shielding part 320 is formed in the form of a thin disk to have a predetermined thickness and a radius D, and a through hole is formed in the center so that the pipe of the heat recovery boiler passes therethrough. In addition, the shielding part 320 is in contact with the outer peripheral surface of the pipe of the heat recovery boiler, and the outer peripheral surface of the shielding part is coupled to one side of the support part of the adjusting part to be described later.

A plurality of control units 330 are installed inside the housing unit 310 to control the behavior of the shielding unit 320 in association with the movement of the pipe 2 of the heat recovery boiler. A plurality of such adjustment units 330 are installed inside the housing unit 310 to be spaced apart from each other at a predetermined angle with respect to the center C of the cover unit. That is, for example 2 at a 180 degree angle, 3 at a 120 degree angle, 4 at a 90 degree angle, 5 at a 72 degree angle, 6 at a 60 degree angle, 8 at a 45 degree angle, and 30 degrees at an angle. 12 can be installed. As shown in Figure 5, preferably, four adjustment units are installed in the housing portion 310 spaced apart at an angle of 90 degrees with respect to the center (C) of the cover portion. Accordingly, it is possible to maximize stability and reliability, reduce manufacturing cost and manufacturing time, and minimize maintenance cost by controlling the behavior of the shielding part according to the movement of the pipe in an optimal state and stably.

As such, in the expansion joint pipe for a heat recovery boiler according to the present invention, the open part 110 between the pipe 2 and the expansion and contraction part 100 of the heat recovery boiler is shielded by the cover part, so that the heat of the pipe of the heat recovery boiler is prevented. Prevents exposure to the outside to prevent damage to expansion joints by heat, reducing maintenance costs for expansion joints, promoting operator convenience, preventing safety accidents, and heat recovery boilers caused by heat loss operation efficiency can be maximized.

In addition, as shown in FIG. 4, the adjusting part 330 of the cover part 300 of the expansion joint pipe 10 for a heat recovery boiler according to the present invention includes a lower guide part 331, an upper guide part 332, It includes a support part 333 and a pressing part 334 .

The lower guide part 331 is formed to extend in the horizontal direction so as to be slidable in the horizontal direction from the top surface of the lower base part 311 . That is, the lower guide portion 331 is coupled to the upper end surface of the lower base portion to be slidable in the horizontal direction from the upper surface of the lower base portion, and extends to have a predetermined length L in the horizontal direction.

The upper guide part 332 is vertically spaced apart from the lower guide part, parallel to each other, and extends in the horizontal direction so as to be slidable in the horizontal direction from the bottom surface of the upper base part. That is, the upper guide part 332 is the lower end of the upper guide part. It is coupled to the lower surface of the upper base portion so as to be slidable in the horizontal direction on the surface and extends to have a predetermined horizontal length (L) corresponding to the lower guide portion in the horizontal direction.

The support part 333 is formed extending in the vertical direction between one side of the lower guide part and one side of the upper guide part so as to face and parallel the connection part 313 in the horizontal direction. That is, the support part is parallel to the connecting part in the horizontal direction with the connection part between the lower guide part and the upper guide part so that one end of the support part is coupled to the lower surface of one side of the upper guide part and the other end of the support part is coupled to the upper surface of one side of the lower guide part. so as to extend in the vertical direction.

The pressing part 334 is installed between the supporting part 333 and the connecting part 313 to elastically press the shielding part 320 . That is, the pressing part 334 has a predetermined elastic modulus in the form of a coil spring and is installed between the support part and the connection part, and the shielding part behaves in conjunction with the movement of the piping of the heat recovery boiler caused by water expansion or vibration of the heat recovery boiler. The opening part can be completely closed while reducing the load on the shielding part due to the elastic force.

As such, in the expansion joint pipe for a heat recovery boiler according to the present invention, when the cover part moves in conjunction with the movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler, when the shield part moves, the load of the corresponding shield is pressed. As the part moves while reducing the load in all directions, it completely blocks the heat of the pipe from being exposed to the outside through the opening, protecting the insulation part of the expansion and contraction part, improving the durability and stability of the expansion joint, and maximizing the service life. Reduces maintenance cost of joint pipe, promotes operator convenience, maximizes operation efficiency of heat recovery boiler by minimizing heat loss of heat recovery boiler, improves stability and reliability of heat recovery boiler, and prevents safety accidents can be prevented in advance.

In addition, although not necessarily limited thereto, the horizontal length (L) of the lower base part of the adjusting part of the cover part of the expansion joint for the heat recovery boiler according to the present invention, the radius (D) of the shielding part, and the horizontal length (W) of the lower guide part ) is preferably formed such that the ratio is 1: 0.4 or more to 0.6 or less: 0.2 or more to 0.4 or less. If the ratio of the horizontal length (L) of the lower base of the control part of the cover part of the expansion joint for the heat recovery boiler to the radius (D) of the shield and the horizontal length (W) of the lower guide part is less than 1: 0.4: less than 0.2 In the case of being formed as a , damage and wear of the upper guide part and the lower guide part increase due to frictional force and stress concentration between the upper base part and the lower base part when the lower guide part and the upper guide part slide in the horizontal direction according to the behavior of the shielding part. In addition, deformation and damage of the shielding part are accelerated due to heat, and the lifespan is reduced. increasing problems arise. In addition, the ratio of the horizontal length (L) of the lower base part of the control part of the cover part of the expansion joint for the heat recovery boiler to the radius (D) of the shield and the horizontal length (W) of the lower guide part exceeds 1: 0.6: exceeds 0.4 In the case of being formed as a , the vibration and noise increase when the lower guide part and the upper guide part slide in the horizontal direction according to the behavior of the shielding part, and the manufacturing cost and manufacturing time increase as more than 6 adjusting parts must be installed, and the behavior of the shielding part As the pressing part cannot be elastically pressurized by immediately reflecting the .

Therefore, the horizontal length (L) of the lower base part of the control part of the cover part of the expansion joint for the heat recovery boiler according to the present invention, the radius (D) of the shield part, the horizontal length (W) of the lower guide part, and the installation of the adjusting part accordingly Reduced manufacturing cost and manufacturing time of expansion joint pipe for heat recovery boiler by designing with optimized ratio and number to number, reducing maintenance cost, miniaturization and compactness of heat recovery boiler, and maximizing space utilization can do.

The stretchable part, the flange part, and the cover part include a waterproof coating layer. In particular, the housing part, the shielding part, and the control part of the cover part include a waterproof coating layer, and the waterproof coating layer is formed using a waterproof coating composition. Also, in another embodiment, a shrink film or a vacuum film may be used. In this case, the material of the shrink film and the vacuum film is PP, PE, or the like.

The waterproof coating composition is a silane compound represented by the following formula (1); bookbinder; inorganic particles; surfactants and dispersants.

The binder is selected from the group consisting of acrylic binders, urethane-based binders, silicone-based binders, and mixtures thereof, more specifically silicone-based binders, and more specifically polyhydrosiloxane may be used as the binder, but is not limited to the above examples.

The surfactant is a betaine-based surfactant, more specifically alkylbetaine, amidebetaine, sulfobetaine, hydroxysulfobetaine, amidosulfobetaine, phosphobetaine, and imidazolinium betaine. It may be selected from the group consisting of, but is not limited to the above examples.

The dispersant may use a known component employed in the art as a dispersant of the carbon-based filler. More specifically, polyester-based dispersing agent, polyphenylene ether-based dispersing agent, polyolefin-based dispersing agent, acrylonitrile-butadiene-styrene copolymer dispersing agent, polyarylate-based dispersing agent, polyamide-based dispersing agent, polyamideimide-based dispersing agent, polyarylsulfone-based dispersing agent dispersing agent, polyetherimide-based dispersing agent, polyethersulfone-based dispersing agent, polyphenylene sulfide-based dispersing agent, polyimide-based dispersing agent; Polyether ketone dispersant, polybenzoxazole dispersant, polyoxadiazole dispersant, polybenzothiazole dispersant, polybenzimidazole dispersant, polypyridine dispersant, polytriazole dispersant, polypyrrolidine dispersant, polypyrrolidine dispersant It may be selected from the group consisting of dispersants, polysulfone-based dispersants, polyurea-based dispersants, polyurethane-based dispersants, polyphosphazene-based dispersants, and mixtures thereof, but is not limited thereto.

The inorganic particles are selected from the group consisting of titanium sol, alumina sol, silica sol, and mixtures thereof, and preferably, alumina sol and silica sol may be mixed and used, but the examples are not limited thereto.

More specifically, the coating composition includes a binder, and based on 100 parts by weight of the binder, 30 to 50 parts by weight of a silane compound represented by the following Chemical Formula 1; 5 to 10 parts by weight of inorganic particles; 10 to 20 parts by weight of a surfactant and 10 to 15 parts by weight of a dispersant may be included. When used within the above range, by the mixing action between the components of the coating composition, the waterproof effect appears, and if it is less than the range or exceeds the range, there may be a problem that the waterproof effect is inhibited.

The waterproof coating composition may form a waterproof coating layer by a spray coating method, and forming the waterproof coating layer using the waterproof coating composition may use a known method other than the spray coating method.

Accordingly, by maximizing the waterproofness of the expansion and contraction part, the flange part, the cover part, especially the housing part, the shield part, and the adjustment part forming the cover part, the expansion joint pipe is protected from moisture generated by the temperature difference between the heat of the pipe and the outside air or by the pressure difference. It is possible to reduce the maintenance cost by increasing the corrosion resistance and lifespan of the expansion joint by protecting it, and by improving the stability, it can maximize the reliability and safety of the heat recovery boiler and prevent safety accidents in advance.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those having ordinary knowledge in the technical field of the present invention described in the claims to be described later It will be understood that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10: expansion joint
100: stretch part
200: flange part
300: cover part

Claims (5)

an expansion and contraction unit which is coupled and installed to a part of the piping of the heat recovery boiler;
a flange portion formed at one end of the stretchable portion; and
and a cover part that is detachably coupled to the flange part and operates in conjunction with the movement of the pipe of the heat recovery boiler caused by water expansion or vibration of the pipe of the heat recovery boiler; Expansion joint pipe for boiler.
According to claim 1,
The cover part,
housing unit;
a shielding part having a through hole through which the pipe of the heat recovery boiler is disposed and formed in a disk shape to shield an open part between the pipe of the heat recovery boiler and the expansion and contraction part; and
and a plurality of control units installed inside the housing unit to control the behavior of the shielding unit in conjunction with the movement of the piping of the heat recovery boiler.
3. The method of claim 2,
The control unit,
Expansion joint pipe for heat recovery boiler, characterized in that four are installed inside the housing part spaced apart at an angle of 90 degrees with respect to the center of the cover part.
4. The method of claim 3,
The housing part,
a lower base portion extending in the horizontal direction;
an upper base part extending in a horizontal direction so as to be parallel to each other while being spaced apart from the lower base part in a vertical direction; and
and a connection part extending in a vertical direction between the lower base part and the upper base part.
5. The method of claim 4,
The control unit,
a lower guide portion extending in a horizontal direction so as to be slidable in the horizontal direction from an upper surface of the lower base portion;
an upper guide part spaced apart from the lower guide part in a vertical direction, parallel to each other, and extending in a horizontal direction so as to be slidable in the horizontal direction from a lower end surface of the upper base part;
a support part extending in a vertical direction between one side of the lower guide part and one side of the upper guide part so as to face each other in a horizontal direction and parallel to the connection part; and
and a pressing part installed between the support part and the connection part to elastically press the shielding part.

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