CN113667977B - Heat dissipation composite protection structural layer of garbage power station pipeline and preparation process - Google Patents

Heat dissipation composite protection structural layer of garbage power station pipeline and preparation process Download PDF

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CN113667977B
CN113667977B CN202110989324.2A CN202110989324A CN113667977B CN 113667977 B CN113667977 B CN 113667977B CN 202110989324 A CN202110989324 A CN 202110989324A CN 113667977 B CN113667977 B CN 113667977B
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layer
surfacing
spraying
build
adopting
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CN113667977A (en
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李倬舸
魏强
钟日钢
曲作鹏
王东
赵娜娜
刘红
田欣利
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Shenzhen Energy and Environmental Protection Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00—Welding or cutting by means of a plasma
    • B23K10/02—Plasma welding
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    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/027—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal matrix material comprising a mixture of at least two metals or metal phases or metal matrix composites, e.g. metal matrix with embedded inorganic hard particles, CERMET, MMC.
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/134—Plasma spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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    • Y02P10/25—Process efficiency

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Abstract

The invention provides a heat dissipation composite protection structure layer of a garbage power station pipeline and a preparation process thereof, comprising the following steps: adopting a plasma arc automatic surfacing system, surfacing a heating surface of a water wall pipe row by adopting inconel625 nickel-based alloy wires to form a surfacing layer; then, carrying out surface spraying on the surface of the surfacing layer by adopting a supersonic plasma automatic spraying system to form a spraying layer; then carrying out high-frequency induction remelting on the spray coating and the build-up welding layer; the joint surface of the build-up layer and the collective can reach a metallurgical state, and meanwhile, the surface of the build-up layer is sprayed and remelted to manufacture a high-quality surface layer, and the powder proportion of the high-quality surface layer is adjusted, so that a certain melting point is reduced on the premise of reaching the condition similar to the material of the build-up layer, and the spray layer can be remelted to reach high joint strength with the build-up layer; and the cost is obviously reduced, the preparation efficiency is improved, but the protection capability is obviously improved.

Description

Heat dissipation composite protection structural layer of garbage power station pipeline and preparation process
Technical Field
The invention relates to the technical field of pipeline structural layers, in particular to a heat dissipation composite protection structural layer of a garbage power station pipeline used in a high-temperature environment and a preparation process thereof.
Background
With the acceleration of the development of new energy strategies, the waste incineration power generation industry has been rapidly developed in recent years. The bottleneck problem of the current technical development of the waste incineration power generation is that four pipes of a boiler are severely corroded at high temperature, and the phenomenon of pipe explosion frequently occurs. In recent years, the international cancer research center has made dioxin as a first-class human carcinogen, so that national standards have established that waste incineration must meet the requirements of '850 ℃ and 2 seconds'. The temperature resistance of the boiler tube bank is improved to more than 700 ℃ in the industry, and the service life is required to be more than 6 years. The corrosion resistance of the alloy is improved by overlaying an inconel625 alloy on the heating surface of the pipe. The biggest problem with inconel625 alloy is that the temperature reaches 450 ℃ and sensitization phenomenon occurs, namely, as long as the temperature is exceeded, the corrosion resistance of the material gradually decreases, and once the smoke temperature exceeds 750 ℃, the actual service life of the material is only 50% of the designed life. In addition, in order to reduce the build-up welding dilution rate, the thickness of the build-up welding layer is not less than 2mm, so that the problems of low efficiency and high cost are caused. At present, most of garbage incineration boilers in China are medium-temperature and medium-pressure boilers, induction fusion welding has a good application effect in the medium-temperature and medium-pressure boilers, but for increasingly high-parameter boilers with strong development potential, the protection capability of the high-parameter boilers faces new challenges due to further rising of parameters such as temperature, pressure and the like. Therefore, development of new technologies with better protection performance and longer service life has become a task to be solved in front of various manufacturers.
Disclosure of Invention
In order to solve the existing problems, the invention provides a method for forming a tightly combined structural layer formed by different processes by pre-arranging a thin layer overlaying process on the basis of a composite method of spraying self-fluxing alloy and high-frequency induction remelting and changing a spraying method.
In order to achieve the above purpose, the invention provides a preparation process of a heat dissipation composite protection structure layer of a garbage power station pipeline, which comprises the following steps:
adopting a plasma arc automatic surfacing system, surfacing a heating surface of a water wall pipe row by adopting inconel625 nickel-based alloy wires to form a surfacing layer;
then, carrying out surface spraying on the surface of the surfacing layer by adopting a supersonic plasma automatic spraying system to form a spraying layer;
and then carrying out high-frequency induction remelting on the spray coating and the build-up welding layer.
Preferably, during the overlaying process, the wire feeding speed is 182inch/min, the width of the welding line is 17mm, and the thickness is 0.5-0.6mm.
Preferably, when spraying, the process conditions are current 300A, power 400KW, gas pressure 0.4-0.8MPa, powder feeding pressure 0.6-0.8MPa, powder feeding rate 90-120g/min, spraying distance 150-230mm, preheating temperature 80-100 deg.C and spraying layer thickness 0.4-0.5 mm.
Preferably, the content proportion of the sprayed composite alloy powder is Ni 50wt percent to 54 wt percent wt wt percent, cr 13wt percent to 15 wt wt percent, mo 9wt percent to 12wt percent, cu 1.7wt percent to 2wt percent, B1.7 wt percent to 2wt wt percent, si 2.5wt percent to 3wt percent, fe 2wt percent to 4wt percent and NiCr-Cr 2 C 3 8wt％-20wt％。
Preferably, the melting point of the build-up layer is 1340-1350 ℃, and the melting point of the spray coating layer is 1140-1160 ℃.
Preferably, a feed rate of 0.6-1.5m/s is used in the high frequency induction remelting and the addition of the spray coating to the melting point is stopped.
The heat dissipation composite protection structure layer comprises a surfacing layer and a spraying layer, wherein the surfacing layer is attached to the surface of the pipeline, and the spraying layer is arranged on one side, far away from the pipeline, of the surfacing layer.
A garbage power station pipeline is also disclosed, which is provided with the protective structure layer manufactured by the process.
The beneficial effects of the invention are as follows: the invention provides a preparation process of a heat dissipation composite protection structure layer of a garbage power station pipeline, which comprises the following steps: adopting a plasma arc automatic surfacing system, surfacing a heating surface of a water wall pipe row by adopting inconel625 nickel-based alloy wires to form a surfacing layer; then, carrying out surface spraying on the surface of the surfacing layer by adopting a supersonic plasma automatic spraying system to form a spraying layer; then carrying out high-frequency induction remelting on the spray coating and the build-up welding layer; the joint surface of the build-up layer and the collective can reach a metallurgical state, and meanwhile, the surface of the build-up layer is sprayed and remelted to manufacture a high-quality surface layer, and the powder proportion of the high-quality surface layer is adjusted, so that a certain melting point is reduced on the premise of reaching the condition similar to the material of the build-up layer, and the spray layer can be remelted to reach high joint strength with the build-up layer; and the cost is obviously reduced, the preparation efficiency is improved, but the protection capability is obviously improved.
Drawings
FIG. 1 shows the steps of the process of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to the accompanying drawings.
In the following description, details of selected examples are given to provide a more thorough understanding of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. It should be understood that the detailed description is intended to illustrate the invention, and is not intended to limit the invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
In the prior art, the garbage incinerator is a medium-temperature medium-pressure furnace, wherein the medium-temperature medium-pressure furnace is that P is more than 2.5Mpa and less than or equal to 6Mpa, and T is more than 400 ℃ and less than or equal to 450 ℃; the high parameters include medium temperature secondary high pressure and secondary high temperature secondary high pressure, and the general temperature is 450-485 ℃, and the pressure is 5.3-1.3.7mpa; in the prior art, a coating or a separate surfacing layer is often used for anti-corrosion, so that the protection effect is very difficult to achieve; wherein thermal spraying is difficult to meet the requirements due to high porosity and low bonding strength; the conventional surfacing technology has wider application and good effect, but the problems of high cost, low efficiency, high dilution rate and the like are challenged; although the technology of flame spraying self-fluxing alloy, high-frequency induction remelting and supersonic plasma spraying is further developed, namely, when a pipe row coating is still in a red hot state after high-frequency induction remelting and the pipe row is just out of a high-frequency induction coil, a metal ceramic surface layer is prepared by supersonic plasma spraying on the basis of an original nickel-based self-fluxing alloy bottom layer, so that the bonding strength between the bottom layer and the surface layer is improved; although the anti-corrosion effect can be improved, the combination effect between the surfacing layer and the spray coating layer is not ideal, and the adopted process sequence and the surfacing raw material selection enable the melting points of the spray coating layer and the surfacing layer to be close when flame spraying is carried out after high-frequency induction remelting, so that the structural strength is influenced; therefore, the selection of the surfacing materials and the coating materials needs to be optimized; and optimizing the process sequence, so that the structure among each layer is tightly combined, and an excellent anti-corrosion effect is achieved.
Specifically discloses a preparation process of a heat dissipation composite protection structure layer of a garbage power station pipeline, referring to fig. 1, the preparation process comprises the following steps:
adopting a plasma arc automatic surfacing system, surfacing a heating surface of a water wall pipe row by adopting inconel625 nickel-based alloy wires to form a surfacing layer; only a thin backing layer is deposited and the thickness is about 0.5-0.6mm. Because of the thin layer build-up welding, the build-up welding speed is more than doubled compared with the traditional build-up welding. Compared with the traditional overlaying welding, the penetration depth is shallower by about 1mm, and the melting quantity of the base metal is less, so that the dilution rate is lower than 5%. Although the overlay is very thin, the overlay is still metallurgically bonded to the tube substrate; therefore, the tight combination degree of the surfacing layer and the pipe wall is ensured;
then, carrying out surface spraying on the surface of the surfacing layer by adopting a supersonic plasma automatic spraying system to form a spraying layer; as described above, although the separate spray coating layer can also exert an anti-corrosion effect, the combination of the spray coating layer and the substrate is only in a semi-metallurgical state, the porosity is large, and the anti-corrosion performance gradually decreases after long-term use;
and after the thickness of the spray coating layer is formed, carrying out high-frequency induction remelting on the spray coating layer and the build-up welding layer. Because the bonding interface between the two bonding interfaces of the composite coating is the bonding interface with the matrix, but if no surfacing layer exists, only the welding layer exists, the bonding between the welding layer and the matrix is only semi-metallurgical bonding, and after the surfacing layer exists, the surfacing layer is bonded with the matrix without metallurgical bonding, and meanwhile, the materials of the surfacing layer and the welding layer are similar, and the bonding strength between the surfacing layer and the welding layer is also tighter than that between the welding layer and the matrix. Specifically, compared with the coating with the thickness of about 0.5mm prepared by the original flame spraying and induction remelting method, the total thickness of the coating is about 1mm, and is doubled, and half of the coating is completed by build-up welding, so that the protective capability is obviously improved; compared with the traditional surfacing, the thickness of the composite coating is reduced by more than 50% under the condition that the protective performance is not reduced, and moreover, the nickel consumption of the nickel-based self-fluxing alloy powder material is adjusted to 40-50%, so that the cost is obviously reduced compared with the nickel consumption (60-70%) of the traditional surfacing inconel625 welding wire, and the preparation efficiency is also correspondingly improved.
In the embodiment, during the surfacing process, the wire feeding speed is 182inch/min, the width of the welding line is 17mm, and the thickness is 0.5-0.6mm. When spraying, the technological conditions are that the current is 300A, the power is 400KW, the gas pressure is 0.4-0.8MPa, the powder feeding pressure is 0.6-0.8MPa, the powder feeding rate is 90-120g/min, the spraying distance is 150-230mm, the preheating temperature is 80-100 ℃, and the thickness of a sprayed layer is 0.4-0.5 mm. The content proportion of the sprayed composite alloy powder is Ni 50wt% -54 wt wt%, cr 13wt% -15 wt wt%, mo 9wt% -12wt%, cu 1.7wt% -2wt%, B1.7 wt% -2wt wt%, si 2.5wt% -3wt%, fe 2wt% -4wt%, niCr-Cr 2 C 3 8wt% to 20wt%. The melting point of the surfacing layer is 1340-1350 ℃ and the melting point of the spraying layer is 1140-1160 ℃ because the content of the spraying composite alloy powder and the content of the surfacing material are distinguished and proportioned; therefore, during high-frequency remelting, the temperature can be controlled to enable the remelting of the spray coating to reach the skin effect; the effect of the higher melting point weld overlay is less by heating the spray coating only to the melting point. The induction remelting realizes diffusion metallurgical bonding between the spray coating and the build-up welding bottom layer, and the porosity of the spray coating is lower than 1.5%. The melting point of the surfacing material is 1350 ℃, and the requirement of building a molten pool of the surfacing layer is mainly met; the melting point of the spray coating is about 1150 ℃, and the spray coating mainly meets the requirement of recrystallization after remelting of the coating main material; the structure of the build-up layer is similar to that of the spray coating layer, so that the build-up layer and the spray coating layer are similar to each otherThe bonding strength between the two is very tight.
In this example, a feed rate of 0.6-1.5m/s was used during the high frequency induction remelting, and the addition of the spray coating to the melting point was stopped. Meanwhile, a special tool is adopted to strictly control the deformation of the tube bank in the surfacing and spraying processes; and detecting the quality of the surface coating of the tube bank, and repairing the local defects.
The heat dissipation composite protection structure layer comprises a surfacing layer and a spraying layer, wherein the surfacing layer is attached to the surface of the pipeline, and the spraying layer is arranged on one side, far away from the pipeline, of the surfacing layer.
A garbage power station pipeline is also disclosed, which is provided with the protective structure layer manufactured by the process.
The invention has the technical effects that:
1. the tightly combined coating formed by the front-arranged thin layer build-up welding process and the spray coating method is changed, and the protection effect is excellent;
2. the high-temperature corrosion protection requirement of the high-parameter boiler is met;
3. the whole coating and the base metal are fixedly connected with high reliability, and the whole porosity is close to that of the build-up welding, so that the aim of long-acting protection of the water wall tube row under the high-parameter condition is fulfilled.
The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be thought by those skilled in the art should fall within the protection scope of the present invention.

Claims (5)

1. The preparation process of the heat dissipation composite protection structure layer of the garbage power station pipeline is characterized by comprising the following steps of:
adopting a plasma arc automatic surfacing system, surfacing a heating surface of a water wall pipe row by adopting inconel625 nickel-based alloy wires to form a surfacing layer;
then, carrying out surface spraying on the surface of the surfacing layer by adopting a supersonic plasma automatic spraying system to form a spraying layer;
then carrying out high-frequency induction remelting on the spray coating and the build-up welding layer;
when spraying, the technological conditions are that the current is 300A, the power is 400kW, the gas pressure is 0.4-0.8MPa, the powder feeding pressure is 0.6-0.8MPa, the powder feeding rate is 90-120g/min, the spraying distance is 150-230mm, the preheating temperature is 80-100 ℃, and the thickness of a sprayed layer is 0.4-0.5 mm; the melting point of the build-up welding layer is 1340-1350 ℃, and the melting point of the spray coating layer is 1140-1160 ℃;
the content proportion of the sprayed composite alloy powder is Ni 50wt% -54 wt wt%, cr 13wt% -15 wt wt%, mo 9wt% -12wt%, cu 1.7wt% -2wt%, B1.7 wt% -2wt wt%, si 2.5wt% -3wt%, fe 2wt% -4wt%, niCr-Cr 2 C 3 8wt％-20wt％。
2. The process for preparing the heat dissipation composite protective structure layer of the garbage power station pipeline according to claim 1, wherein in the overlaying process, the wire feeding speed is 182inch/min, the welding line width is 17mm, and the thickness is 0.5-0.6mm.
3. The process for preparing the heat-dissipating composite protective structure layer of the garbage power station pipeline according to claim 1, wherein the feeding speed of 0.6-1.5m/s is adopted in high-frequency induction remelting, and the spraying layer is added until the melting point is reached.
4. The heat dissipation composite protection structure layer of the garbage power station pipeline is characterized by being manufactured by adopting the manufacturing process of any one of claims 1-3 and comprising a surfacing layer and a spray coating, wherein the surfacing layer is attached to the surface of the pipeline, and the spray coating is arranged on one side, far away from the pipeline, of the surfacing layer.
5. A waste power plant pipeline, characterized by having a protective construction layer made by the preparation process according to any one of claims 1-3.
CN202110989324.2A 2021-08-26 2021-08-26 Heat dissipation composite protection structural layer of garbage power station pipeline and preparation process Active CN113667977B (en)

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