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

A circulating fluidized bed, high temperature resistant technology, applied in the field of materials, can solve the problems of restricting the popularization and application of circulating fluidized bed boilers

Inactive Publication Date: 2017-02-22
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 method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:

[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 NiCrAlY intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-WC 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 method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:

[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 NiCrAlY intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-WC 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 method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:

[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 NiCrAlY intermediate coating on the roughened and cleaned surface, and then plasma spray Cr 3 C 2 -NiCr-WC 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 check the surface, and no obvious cor...

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Abstract

The invention discloses a preparation method of a high-temperature-resistant anti-abrasion coating of a circulating fluidized bed boiler. The preparation method comprises the steps that 1, sand blasting and roughening are conducted on the surfaces of parts of the circulating fluidized bed boiler; 2, the surfaces subjected to sand blasting and roughening are washed with acetone and ethanol successively; 3, a NiCrAlY intermediate coating is plasma-sprayed to the surfaces obtained after roughening and thorough cleaning, and then Cr3C2-NiCr-WC particles are plasma-sprayed, wherein the conditions of a plasma-spraying process include main gas pressure of 0.7-1.0 MPa, auxiliary gas pressure of 0.6-0.9 MPa, main gas flow of 1300-1800 l / h, auxiliary gas flow of 900-1100 l / h, arc current of 450-600 A, arc voltage of 85-100V, powder delivery gas pressure of 0.2-0.4 MPa, powder delivery gas flow of 280-400 l / h, spraying distance of 100-150 mm, spraying speed of 2-3 kg / h and coating thickness of 1-2.5 mm. The coating can be resistant to high-temperature corrosion and high-temperature abrasion when being used for the circulating fluidized bed boiler, is firm and does not shed.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler. 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 circulation is the process of coll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/06C22C29/06
CPCC23C4/06C22C29/06
Inventor 张达明
Owner WUXI MINGSHENG TEXTILE MACHINERY
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