KR101639058B1 - Heat exchange tube coated with non-metal oxides - Google Patents
Heat exchange tube coated with non-metal oxides Download PDFInfo
- Publication number
- KR101639058B1 KR101639058B1 KR1020150182608A KR20150182608A KR101639058B1 KR 101639058 B1 KR101639058 B1 KR 101639058B1 KR 1020150182608 A KR1020150182608 A KR 1020150182608A KR 20150182608 A KR20150182608 A KR 20150182608A KR 101639058 B1 KR101639058 B1 KR 101639058B1
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- KR
- South Korea
- Prior art keywords
- coating layer
- heat exchange
- exchange tube
- oxide
- heat
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C09D7/1216—
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
The present invention relates to a heat exchange tube for generating steam through heat exchange in various boiler facilities such as a circulating fluidized bed boiler (BFB), an arrangement recovery boiler (HRSG) and an incinerator of a cogeneration power plant, The present invention relates to a heat exchange tube coated with a non-glazing type non-metallic oxide capable of preventing cracks caused by heat generated in a heat exchange tube and a coating method thereof.
Generally, a boiler for generating high-temperature steam in a steam-generating power plant includes a
The
The waste
The
In order to solve such a problem, there is a method of using a stainless steel material as the material of the
As an example for improving the surface of the heat exchange tube, a Korean Registered Utility Model No. 20-0387131 (Patent Document 1) discloses a heat exchanging tube or a heat exchanging tube A method of dipping in an aluminum solution heated to an appropriate temperature to be plated, an aluminum electrolytic plating method, or a spraying method in order to prevent corrosion of the outer surface of the piping or the surface of the finned heat exchange pipe and the surface of the fin, A heat exchange pipe has been proposed in which the inner surface and the outer surface of the pipe and the surface of the fin are plated with aluminum. However, since this method is cured and solidified in the liquid phase, Since cracks tend to occur and the hardness of aluminum is low, the ash and dust contained in the combustion gas Therefore, this algorithm is the durability of the coating, such as wear occurs as good contact with the quality and continuously.
As another method for improving the surface of the heat exchange tube, there is a method of forming a glazing-type surface coating layer by applying a non-metal oxide coating agent having wear resistance and corrosion resistance. However, In order to remove foreign substances such as adherents while expanding the volume of the liquid stream by vapor, a glazing-type coated non-metallic oxide The coating layer also causes peeling. Further, since the metallic heat exchange tube has a large thermal expansion coefficient, the non-metallic oxide coating agent has a relatively low thermal expansion coefficient, so that the coating layer easily peels off due to the difference in the thermal expansion coefficient when it is placed under the high temperature environment in the combustion furnace.
SUMMARY OF THE INVENTION The present invention for solving the problems of the prior art described above is to provide a heat exchange tube for generating steam through heat exchange in a boiler facility installed in a power generation facility or an incinerator to improve the corrosion resistance and wear resistance of the heat exchange tube, Coated with a non-glazing nonmetal oxide that is vitrified during use to provide a coating layer with a non-metallic oxide containing silicon carbide and cobalt oxide that can prevent cracking and improve the durability of the non-metallic oxide coating layer The object of the present invention is to provide a heat exchange tube.
In order to accomplish the above object, the present invention is characterized in that a coating layer is formed on a surface of a heat exchange tube installed in a combustion furnace to convert circulating water into steam, and includes a non-glazing type non-metal oxide coating agent do.
As a preferred embodiment, the apparatus further comprises a plurality of anchors fixed to the surface of the heat exchange tube, wherein the non-metallic oxide coating agent may be coated on the surface of the anchor.
In a more preferred embodiment, the coating layer includes a first coating layer in contact with the heat exchange tube, and a second coating layer coated on the outer surface of the first coating layer, wherein the second coating layer is a non-expansive nonmetal oxide coating, The thermal expansion coefficient of the second coating layer is relatively larger than that of the second coating layer, and the thermal expansion coefficient of the second coating layer is smaller than the thermal expansion coefficient of the heat exchange tube.
According to the present invention, a non-metallic oxide having a high thermal conductivity and high hardness is used in a cost-effective manner, that is, under a high temperature environment in a combustion furnace after surface coating, and is melted and formed into a coating layer, thereby being excellent in wear resistance, durability and corrosion resistance.
In addition, if an anchor is attached to the surface of the heat exchange tube, the surface area of the heat exchange tube can be increased and the surface roughness can be lowered, thereby reducing the peeling phenomenon of the metal oxide coating layer.
Further, by forming a non-metal oxide coating layer on the surface of the heat exchange tube, and further forming an intermediate coating layer having a middle thermal expansion coefficient between the heat exchange tube and the non-metal oxide coating layer, the thermal expansion gap between the heat exchange tube and the non-metal oxide coating layer can be minimized, The coating layer peeling phenomenon can be prevented, and the durability can be greatly improved.
1 is a schematic view of a boiler of a general steam generating power plant.
FIG. 2 is an enlarged cross-sectional view of part 'A' of FIG. 1 showing a cross section of a heat exchange tube coated with a non-metallic oxide of the present invention.
Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIG. 2 of the accompanying drawings. It should be understood, however, that there is no intention in the art to limit the present invention, as it is intended to be illustrative only and not for purposes of limitation, A detailed description thereof will be omitted.
FIG. 2 is an enlarged cross-sectional view of part 'A' of FIG. 1 showing a cross section of a heat exchange tube coated with a non-metallic oxide of the present invention.
2, the
Such a
In order to prevent the
The
The
Furthermore, it is preferable that the thermal expansion coefficient of the
In this case, the
The non-metal oxide coating agent may be selected from silicon carbide, cobalt oxide, nickel oxide, alumina and silica having a hardness of 9 or more at the Mohs hardness, a small crack due to thermal expansion, and an excellent thermal conductivity, and water glass can be used as the binder The mixing ratio of these materials and the characteristics thereof are shown in Table 1 below.
As shown in Table 1, the peeling phenomenon occurred in No 1 and No 5, in particular, in the case of No 5, the thermal conductivity was not formed. In the case of No 2 to No 4, vitrification, thermal conductivity, The peeling property was good.
When the amount of silicon carbide is less than 5% by weight, the effect of thermal conductivity is insufficient. When the amount of silicon carbide is more than 70% by weight, thermal conductivity and abrasion resistance are excellent, but peeling phenomenon occurs.
When the content of alumina is more than 25 wt%, the abrasion resistance is excellent, but the thermal conductivity is low, which interferes with the heat conductivity of the heat exchange tube, which is against the purpose of the heat exchanger.
Magnesium oxide and nickel oxide have a high thermal expansion coefficient and swell at the same time when the heat exchanger water pipe is in a pycnometer. When the contents of magnesium oxide and nickel oxide are less than 1 wt% each, the thermal expansion function is insufficient. And when it is more than 10% by weight, the wear resistance is insufficient and the role of the heat exchanger water pipe can not be expected.
In case of silica, it is a typical low expansion material. When it is contained in an amount of more than 50% by weight, peeling phenomenon occurs remarkably. If it is less than 20% by weight, it does not help vitrification function.
The water glass functions as a main binder. When the amount is less than 5% by weight, the bonding force is low and the adhesion is low. When the weight is more than 15% by weight, the coating agent is melted at high temperature by soda in the water glass.
As a result, the non-metal oxide coating agent may contain 5 to 70% by weight of silicon carbide, 2 to 25% by weight of alumina, 1 to 10% by weight of magnesium oxide, 1 to 10% by weight of nickel oxide %, Silica 20-50 wt%, and binder 5-15 wt%
The binder is not limited to the water glass exemplified above, and may be an inorganic or organic binder or a binder mixed with an organic material and an inorganic material. The material and the kind of the binder are not limited, but those having heat resistance are preferable.
The non-metallic oxide particles can be selected as particles smaller than 200 mesh. They are non-glazig coated in the form of particles on the surface of the
On the other hand, the coating material of the
Although the present invention has been described in connection with the preferred embodiments described above, it will be appreciated by those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention, All such changes and modifications are intended to be within the scope of the appended claims.
10: Combustion furnace
20: Heat exchange tube
30: Waste Heat Recovery Unit
40: Desulfurization equipment
50: Dust collector
60: chimney
210: Coating layer
211: first coating layer
212: Second coating layer
220: anchor
Claims (6)
A coating layer including a non-glazing type non-metallic oxide coating agent which is vitrified during use is formed on the surface of the heat exchange tube,
Wherein the coating layer comprises a first coating layer in contact with the heat exchange tube, and a second coating layer coated on an outer surface of the first coating layer, wherein the second coating layer is a non-
Wherein the first coating layer has a relatively higher thermal expansion coefficient than the second coating layer.
Further comprising a plurality of anchors fixed to a surface of the heat exchange tube,
Wherein the coating layer is coated on the surface of the anchor.
Wherein the first coating layer has a thermal expansion coefficient less than that of the heat exchange tube.
Wherein the coating agent for the non-metallic oxide includes 5 to 70 wt% of silicon carbide, 2 to 25 wt% of alumina, 1 to 10 wt% of magnesium oxide, 1 to 10 wt% of nickel oxide, 1 to 50 wt% of silica, ≪ / RTI > coated with a non-metallic oxide.
Wherein the coating agent of the first coating layer comprises 5 to 20% by weight of at least one selected from the group consisting of chromium oxide, magnesium oxide, nickel oxide, manganese oxide and cobalt oxide and 80 to 95% by weight of a boron or silica- Wherein the heat exchanger tube is coated with a non-metallic oxide.
Priority Applications (1)
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KR1020150182608A KR101639058B1 (en) | 2015-12-21 | 2015-12-21 | Heat exchange tube coated with non-metal oxides |
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KR1020150182608A KR101639058B1 (en) | 2015-12-21 | 2015-12-21 | Heat exchange tube coated with non-metal oxides |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117906402A (en) * | 2024-03-19 | 2024-04-19 | 三明市丰润化工有限公司 | Energy-saving recovery device of sodium silicate kiln |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005156057A (en) * | 2003-11-27 | 2005-06-16 | Osaka Gas Co Ltd | Sulfuric acid dew point corrosion preventive heat exchanger and its application method |
KR200387131Y1 (en) | 2004-11-16 | 2005-06-17 | 박향수 | Heat exchanging tube with fins coated with aluminium |
KR20150010983A (en) * | 2012-05-16 | 2015-01-29 | 밥콕 앤 윌콕스 뵐운트 아/에스 | Heat exchanger having enhanced corrosion resistance |
-
2015
- 2015-12-21 KR KR1020150182608A patent/KR101639058B1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005156057A (en) * | 2003-11-27 | 2005-06-16 | Osaka Gas Co Ltd | Sulfuric acid dew point corrosion preventive heat exchanger and its application method |
KR200387131Y1 (en) | 2004-11-16 | 2005-06-17 | 박향수 | Heat exchanging tube with fins coated with aluminium |
KR20150010983A (en) * | 2012-05-16 | 2015-01-29 | 밥콕 앤 윌콕스 뵐운트 아/에스 | Heat exchanger having enhanced corrosion resistance |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117906402A (en) * | 2024-03-19 | 2024-04-19 | 三明市丰润化工有限公司 | Energy-saving recovery device of sodium silicate kiln |
CN117906402B (en) * | 2024-03-19 | 2024-05-31 | 三明市丰润化工有限公司 | Energy-saving recovery device of sodium silicate kiln |
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