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Preparing method of high-temperature-resistant anti-abrasion gradient coating of circulating fluidized bed boiler

A circulating fluidized bed and gradient coating technology, applied in the field of materials, can solve problems that limit the popularization and application of circulating fluidized bed boilers

Inactive Publication Date: 2017-01-04
WUXI MINGSHENG TEXTILE MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This defect has not been well resolved, which limits the further popularization and application of circulating fluidized bed boilers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A circulating fluidized bed boiler with high temperature resistance and anti-abrasion Cr 3 C 2 -The preparation method of NiCr-BN gradient coating, it comprises:

[0022] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0023] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0024] (3) Plasma spray NiCrBSi intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-BN particles, the plasma spraying process conditions include: main air pressure 0.7MPa, auxiliary air pressure 0.6MPa, main air flow 1300l / h, auxiliary air flow 900l / h, arc current 450A, arc voltage 85V, powder feeding The air pressure is 0.2MPa, the powder feeding air flow rate is 280l / h, the spraying distance is 100mm, the spraying speed is 2kg / h, and the coating thickness is 1mm.

Embodiment 2

[0026] A circulating fluidized bed boiler with high temperature resistance and anti-abrasion Cr 3 C 2 -The preparation method of NiCr-BN gradient coating, it comprises:

[0027] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0028] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0029] (3) Plasma spray NiCrBSi intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-BN particles, the plasma spraying process conditions include: main air pressure 1.0MPa, auxiliary air pressure 0.9MPa, main air flow 1800l / h, auxiliary air flow 1100l / h, arc current 600A, arc voltage 100V, powder feeding The air pressure is 0.4MPa, the powder feeding air flow rate is 400l / h, the spraying distance is 150mm, the spraying speed is 3kg / h, and the coating thickness is 2.5mm.

Embodiment 3

[0031] A circulating fluidized bed boiler with high temperature resistance and anti-abrasion Cr 3 C 2 -The preparation method of NiCr-BN gradient coating, it comprises:

[0032] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0033] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0034] (3) Plasma spray NiCrBSi intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-BN particles, the plasma spraying process conditions include: main air pressure 0.8MPa, auxiliary air pressure 0.7MPa, main air flow 1500l / h, auxiliary air flow 1000l / h, arc current 500A, arc voltage 90V, powder feeding The air pressure is 0.3MPa, the powder feeding air flow rate is 350l / h, the spraying distance is 120mm, the spraying speed is 2.5kg / h, and the coating thickness is 2mm.

[0035] The coating prepared in Example 1-2, after 100 hours of actual use, was shut down to che...

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Abstract

The invention discloses a preparing method of a high-temperature-resistant anti-abrasion gradient coating of a circulating fluidized bed boiler. The preparing method includes the steps that (1), sandblasting coarsening is carried out on the surface of a component of the circulating fluidized bed boiler; (2), the sandblasting coarsened surface is sequentially washed with acetone and ethyl alcohol and dried; (3), plasma spray is carried out on the coarsened and cleaned surface to obtain a NiCrBSi middle coating, and then Cr3C2-NiCr-BN particles are sprayed in a plasma mode; according to the plasma spray technological conditions, the main pressure force is 0.7-1.0 MPa, the auxiliary pressure force is 0.6-0.9 MPa, the main airflow rate is 1300-1800 l / h, the auxiliary airflow rate is 900-1100 l / h, the arc current is 450-600 A, the arc voltage is 85-100 V, the powder conveying air pressure is 0.2-0.4 MPa, the powder conveying airflow rate is 280-400 l / h, the spray distance is 100-150 mm, the spray speed is 2-3 kg / h, and the thickness of the coating is 1-2.5 mm. The coating is capable of resisting high-temperature corrosion and abrasion when used in the circulating fluidized bed boiler and is firm without falling.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a circulating fluidized bed boiler high temperature resistant and anti-abrasion Cr 3 C 2 -The preparation method of NiCr-BN gradient coating. Background technique [0002] The difference between a circulating fluidized bed boiler and a conventional boiler is that its combustion system is different. Gas-solid material separation equipment and solid material recirculation equipment are the main features of circulating fluidized bed boilers. The combustion of circulating fluidized bed boiler includes two processes of internal circulation and external circulation. The internal circulation is the circulation process in the furnace, that is, the flue gas moving at high speed in the furnace is in close contact with the solid particles with strong turbulent disturbance, and there are a large number of Fluidized combustion reaction process with particle backmixing. The outer circulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/06
Inventor 张达明
Owner WUXI MINGSHENG TEXTILE MACHINERY
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