A highly abrasion resistant boiler anti-wear and explosion-proof material

Abstract

The present application relates to a kind of highly wear-resistant boiler anti-abrasion and anti-explosion material, it is made of the following weight percentage components: Cr 35-40%, W 8-10%, Sn 1-3%, Fe 1.5-2%, B 1-4%, Pb 3-5%, Mo 2-6%, Ni 4-8%, the balance is aluminum.To solve the corrosion and impact of flue gas, sundust generated in fuel combustion, water wall can appear oxidation and wear phenomenon, so that the service life of water wall is reduced, and if not handled in time, the problem of pipe explosion phenomenon will appear, the highly wear-resistant boiler anti-abrasion and anti-explosion material proposed in the present application is sprayed to water wall, can effectively protect water wall, reduce the oxidation and wear of water wall, improve the service life of entire water wall, reduce the boiler stop running caused by the service life of water wall.

Description

Technical Field

[0001] This invention belongs to the field of surface protection technology, specifically, it relates to a highly wear-resistant boiler anti-wear and explosion-proof material. Background Technology

[0002] In recent years, although my country has vigorously promoted clean power generation methods such as wind power, hydropower, and photovoltaic power, thermal power generation remains the main form of electricity supply in my country. Thermal power generation is a method of power generation that uses the heat energy generated by burning combustibles (such as coal, heavy oil, and waste) in a boiler, and converts it into electrical energy through a power generation device.

[0003] Wear and explosion prevention of pressure-bearing components in boilers used for power generation is a top priority for power plants. Effective wear and explosion prevention is a challenge for every power plant. Water-cooled walls are the main heat-receiving part of the boiler, consisting of several rows of steel tubes distributed around the boiler furnace. Inside, water or steam flows, and the walls receive heat from the flames in the furnace. Under the corrosive and impact effects of flue gas and dust generated during fuel combustion, water-cooled walls will oxidize and wear, reducing their lifespan. If not addressed promptly, tube ruptures can occur, leading to unplanned shutdowns. Summary of the Invention

[0004] To overcome the problems existing in the background technology, the present invention provides a highly wear-resistant boiler anti-wear and explosion-proof material. Spraying it onto the water-cooled wall can effectively protect the water-cooled wall, reduce the oxidation and wear of the water-cooled wall, extend the service life of the entire water-cooled wall, and reduce boiler downtime caused by the lifespan of the water-cooled wall.

[0005] To achieve the above objectives, the first aspect of the present invention provides a highly wear-resistant boiler anti-wear and explosion-proof material, which is composed of the following components in weight percentage: Cr 35-40%, W 8-10%, Sn 1-3%, Fe 1.5-2%, B 1-4%, Pb 3-5%, Mo 2-6%, Ni 4-8%, with the balance being aluminum.

[0006] Furthermore, it is composed of the following components by weight percentage: Cr 40%, W 10%, Sn 2%, Fe 1.5%, B 3%, Pb 4%, Mo 3%, Ni 5%, with the balance being aluminum.

[0007] Furthermore, it is composed of the following components by weight percentage: Cr 35%, W 10%, Sn 3%, Fe 1.5%, B 4%, Pb 3%, Mo 2%, Ni 5%, with the balance being aluminum.

[0008] A second aspect of the present invention discloses a method for spraying a highly wear-resistant boiler anti-wear and explosion-proof material, comprising the following steps:

[0009] S1, Preparation of core wire: Weigh Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum in proportion, mix them evenly to obtain mixed powder, wrap the dried mixed powder with steel belt, and obtain core wire by gradually reducing the diameter, controlling the diameter of the core wire to be 2-3mm.

[0010] S2, Substrate treatment: After sandblasting the substrate with diamond abrasive, the substrate is preheated to 200°C.

[0011] S3, Primer treatment: Spray nickel-aluminum solid wire onto the substrate surface as a primer, controlling the thickness of the sprayed layer to be 0.2-0.4mm;

[0012] S4, Spraying: The powder core wire material obtained in step S1 is used as the spraying material. The pretreated substrate surface is sprayed using a supersonic electric arc spraying method. After the coating is obtained, a sealing agent is used to seal the pores of the coating to reduce the porosity.

[0013] S5, Post-treatment: In order to further reduce porosity, heat treatment is carried out at 700℃ for 6 hours, followed by furnace cooling.

[0014] Furthermore, the particle size of Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum is 40-120 μm.

[0015] Furthermore, the sealing agent is sodium silicate.

[0016] Furthermore, in step S4, the thickness of the sprayed coating is 0.2-0.3 mm.

[0017] Furthermore, in step S2, the substrate is preheated to 200°C.

[0018] Furthermore, the process parameters for the supersonic arc spraying are: voltage 55-60V, current 500-550A, distance 12-14cm, air pressure 0.7-0.9MPa, spray gun angle 70-75°, and spray gun moving speed 80-100cm / min.

[0019] Furthermore, the supersonic arc spraying process parameters are: voltage 560V, current 550A, distance 12cm, air pressure 0.9MPa, spray gun angle 70°, and spray gun moving speed 100cm / min.

[0020] The beneficial effects of the present invention are as follows: spraying the material described in the present invention onto the water-cooled pipe wall can effectively improve the service life of the water-cooled wall, which is significantly improved compared to the existing service life of about one year. Detailed Implementation

[0021] To make the objectives, technical solutions, and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below to facilitate understanding by those skilled in the art.

[0022] In this invention, Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum are all commercially available products. In the embodiments, G20 steel is used as the matrix material.

[0023] Example 1

[0024] A highly wear-resistant boiler anti-wear and explosion-proof material is composed of the following components by weight percentage: Cr 40%, W 10%, Sn 2%, Fe 1.5%, B 3%, Pb 4%, Mo 3%, Ni 5%, with the balance being aluminum.

[0025] The spraying method for the above materials includes the following steps:

[0026] S1, Preparation of core wire: Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum with a particle size of 40μm are weighed according to the proportion, and mixed evenly to obtain a mixed powder. The dried mixed powder is wrapped with a steel belt and the core wire is obtained by gradually reducing the diameter. The diameter of the core wire is controlled to be 2mm.

[0027] S2, Substrate treatment: After sandblasting the substrate with diamond abrasive, the substrate is preheated to 200°C.

[0028] S3, Base treatment: Spray nickel-aluminum solid wire onto the substrate surface as a base, controlling the thickness of the sprayed layer to be 0.4mm;

[0029] S4, Spraying: The powder-core wire material obtained in step S1 is used as the spraying material. The pretreated substrate surface is sprayed using a supersonic arc spraying method. The coating thickness is 0.2 mm. After the coating is obtained, sodium silicate is used as a sealing agent to seal the pores of the coating and reduce the porosity. The supersonic arc spraying process parameters are: voltage 560V, current 550A, distance 12cm, air pressure 0.9MPa, spray gun angle 70° and spray gun moving speed 100cm / min.

[0030] S5, Post-treatment: In order to further reduce porosity, heat treatment is carried out at 700℃ for 6 hours, followed by furnace cooling.

[0031] Actual measurements showed that the coating microhardness was 480 HV, and the service life of the water-cooled wall coated with the paint of this invention was 2 years and 6 months.

[0032] Example 2

[0033] A highly wear-resistant boiler anti-wear and explosion-proof material is composed of the following components by weight percentage: Cr 35%, W 8%, Sn 1%, Fe 1.5%, B 1%, Pb 3%, Mo 2%, Ni 4%, with the balance being aluminum.

[0034] The spraying method for the above materials includes the following steps:

[0035] S1, Preparation of core wire: Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum with a particle size of 60μm are weighed according to the proportion, and mixed evenly to obtain a mixed powder. The dried mixed powder is wrapped with a steel belt and the core wire is obtained by gradually reducing the diameter. The diameter of the core wire is controlled to be 3mm.

[0036] S2, Substrate treatment: After sandblasting the substrate with diamond abrasive, the substrate is preheated to 200°C.

[0037] S3, Base treatment: Spray nickel-aluminum solid wire onto the substrate surface as a base, controlling the thickness of the sprayed layer to be 0.2mm;

[0038] S4, Spraying: The powder-core wire obtained in step S1 is used as the spraying material. The pretreated substrate surface is sprayed using a supersonic arc spraying method. The coating thickness is 0.3 mm. After the coating is formed, sodium silicate is used as a sealing agent to seal the pores and reduce the porosity. The process parameters for supersonic arc spraying are: voltage 55V, current 500A, distance 12cm, air pressure 0.7MPa, spray gun angle 70°, and spray gun moving speed 80cm / min.

[0039] S5, Post-treatment: In order to further reduce porosity, heat treatment is carried out at 700℃ for 6 hours, followed by furnace cooling.

[0040] Actual measurements showed that the coating microhardness was 475 HV, and the service life of the water-cooled wall coated with the paint of this invention was 2 years and 4 months.

[0041] Example 3

[0042] A highly wear-resistant boiler anti-wear and explosion-proof material is composed of the following components by weight percentage: Cr 40%, W 10%, Sn 3%, Fe 2%, B 4%, Pb 5%, Mo 6%, Ni 8%, with the balance being aluminum.

[0043] The spraying method for the above materials includes the following steps:

[0044] S1, Preparation of core wire: Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum with a particle size of 120μm are weighed according to the proportion, and mixed evenly to obtain a mixed powder. The dried mixed powder is wrapped with a steel belt and the core wire is obtained by gradually reducing the diameter. The diameter of the core wire is controlled to be 3mm.

[0045] S2, Substrate treatment: After sandblasting the substrate with diamond abrasive, the substrate is preheated to 200°C.

[0046] S3, Base treatment: Spray nickel-aluminum solid wire onto the substrate surface as a base, controlling the thickness of the sprayed layer to be 0.4mm;

[0047] S4, Spraying: The powder-core wire obtained in step S1 is used as the spraying material. The pretreated substrate surface is sprayed using a supersonic arc spraying method. The coating thickness is 0.2 mm. After the coating is formed, sodium silicate is used as a sealing agent to seal the pores and reduce the porosity. The process parameters for supersonic arc spraying are: voltage 60V, current 550A, distance 14cm, air pressure 0.9MPa, spray gun angle 75°, and spray gun moving speed 100cm / min.

[0048] S5, Post-treatment: In order to further reduce porosity, heat treatment is carried out at 700℃ for 6 hours, followed by furnace cooling.

[0049] Actual measurements showed that the coating microhardness was 490 HV, and the service life of the water-cooled wall coated with the paint of this invention was 2 years and 11 months.

[0050] Example 4

[0051] A highly wear-resistant boiler anti-wear and explosion-proof material is composed of the following components by weight percentage: Cr 37%, W 9%, Sn 2%, Fe 1.5%, B 3%, Pb 4%, Mo 4%, Ni 6%, with the balance being aluminum.

[0052] The spraying method for the above materials includes the following steps:

[0053] S1, Preparation of core wire: Weigh out Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum with a particle size of 80μm according to the proportion, mix them evenly to obtain a mixed powder, wrap the dried mixed powder with a steel belt, and obtain core wire by gradually reducing the diameter, and control the diameter of the core wire to be 2.5mm.

[0054] S2, Substrate treatment: After sandblasting the substrate with diamond abrasive, the substrate is preheated to 200°C.

[0055] S3, Base treatment: Spray nickel-aluminum solid wire onto the substrate surface as a base, controlling the thickness of the sprayed layer to be 0.3mm;

[0056] S4, Spraying: The powder-core wire material obtained in step S1 is used as the spraying material. The pretreated substrate surface is sprayed using a supersonic arc spraying method. The coating thickness is 0.2 mm. After the coating is obtained, sodium silicate is used as a sealing agent to seal the pores of the coating and reduce the porosity. The process parameters of supersonic arc spraying are: voltage 58V, current 520A, distance 13cm, air pressure 0.8MPa, spray gun angle 72° and spray gun moving speed 90cm / min.

[0057] S5, Post-treatment: In order to further reduce porosity, heat treatment is carried out at 700℃ for 6 hours, followed by furnace cooling.

[0058] Actual measurements showed that the coating microhardness was 510 HV, and the service life of the water-cooled wall coated with the paint of this invention was 3 years and 3 months.

[0059] Example 5

[0060] A highly wear-resistant boiler anti-wear and explosion-proof material is composed of the following components by weight percentage: Cr 35%, W 10%, Sn 3%, Fe 1.5%, B 4%, Pb 3%, Mo 2%, Ni 5%, with the balance being aluminum.

[0061] The spraying method for the above materials includes the following steps:

[0062] S1, Preparation of core wire: Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum with a particle size of 100μm are weighed according to the proportion, and mixed evenly to obtain a mixed powder. The dried mixed powder is wrapped with a steel belt and the core wire is obtained by gradually reducing the diameter. The diameter of the core wire is controlled to be 2mm.

[0063] S2, Substrate treatment: After sandblasting the substrate with diamond abrasive, the substrate is preheated to 200°C.

[0064] S3, Base treatment: Spray nickel-aluminum solid wire onto the substrate surface as a base, controlling the thickness of the sprayed layer to be 0.3mm;

[0065] S4, Spraying: The powder-core wire material obtained in step S1 is used as the spraying material. The pretreated substrate surface is sprayed using a supersonic arc spraying method. The coating thickness is 0.3 mm. After the coating is obtained, sodium silicate is used as a sealing agent to seal the pores of the coating and reduce the porosity. The process parameters of the supersonic arc spraying are: voltage 55V, current 500A, distance 12cm, air pressure 0.9MPa, spray gun angle 75° and spray gun moving speed 95cm / min.

[0066] S5, Post-treatment: In order to further reduce porosity, heat treatment is carried out at 700℃ for 6 hours, followed by furnace cooling.

[0067] Actual measurements showed that the coating microhardness was 490 HV, and the service life of the water-cooled wall coated with the paint of this invention was 3 years and 1 month.

[0068] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A highly wear-resistant boiler anti-wear and explosion-proof material, characterized in that, It is composed of the following components by weight percentage: Cr 35-40%, W 8-10%, Sn 1-3%, Fe 1.5-2%, B 1-4%, Pb 3-5%, Mo 2-6%, Ni 4-8%, with the balance being aluminum.

2. The highly wear-resistant boiler anti-wear and explosion-proof material according to claim 1, characterized in that: It is composed of the following components by weight percentage: Cr 40%, W 10%, Sn 2%, Fe 1.5%, B 3%, Pb 4%, Mo 3%, Ni 5%, with the balance being aluminum.

3. The highly wear-resistant boiler anti-wear and explosion-proof material according to claim 1, characterized in that: It is composed of the following components by weight percentage: Cr 35%, W 10%, Sn 3%, Fe 1.5%, B 4%, Pb 3%, Mo 2%, Ni 5%, with the balance being aluminum.

4. A method for spraying a highly wear-resistant boiler anti-wear and explosion-proof material as described in any one of claims 1-3, characterized in that, Includes the following steps: S1, Preparation of core wire: Weigh Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum in proportion, mix them evenly to obtain mixed powder, wrap the dried mixed powder with steel belt, and obtain core wire by gradually reducing the diameter, controlling the diameter of the core wire to be 2-3mm. S2, Substrate treatment: After sandblasting the substrate with diamond abrasive, the substrate is preheated; S3, Primer treatment: Spray nickel-aluminum solid wire onto the substrate surface as a primer, controlling the thickness of the sprayed layer to be 0.2-0.4mm; S4, Spraying: The powder core wire material obtained in step S1 is used as the spraying material. The pretreated substrate surface is sprayed using a supersonic electric arc spraying method. After the coating is obtained, a sealing agent is used to seal the pores of the coating to reduce the porosity. S5, Post-treatment: In order to further reduce porosity, heat treatment is carried out at 700℃ for 6 hours, followed by furnace cooling.

5. The spraying method according to claim 4, characterized in that: The particle size of Cr, W, Sn, Fe, B, Pb, Mo, Ni and aluminum is 40-120 μm.

6. The spraying method according to claim 4, characterized in that: The sealing agent is sodium silicate.

7. The spraying method according to claim 4, characterized in that: In step S4, the thickness of the sprayed coating is 0.2-0.3 mm.

8. The spraying method according to claim 4, characterized in that: In step S2, the substrate is preheated to 200°C.

9. The spraying method according to claim 4, characterized in that: The process parameters for supersonic arc spraying are: voltage 55-60V, current 500-550A, distance 12-14cm, air pressure 0.7-0.9MPa, spray gun angle 70-75°, and spray gun moving speed 80-100cm / min.