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Preparation method of high-temperature-resisting abrasion-resisting coating of circulating fluidized bed boiler
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A circulating fluidized bed, high temperature resistant technology, applied in the field of materials, can solve problems such as limiting the popularization and application of circulating fluidized bed boilers
Inactive Publication Date: 2017-02-15
WUXI MINGSHENG TEXTILE MACHINERY
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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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Embodiment 1
[0023] A method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:
[0024] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;
[0025] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;
[0026] (3) Bond Cr with nitrocellulose on the roughened and cleaned surface 2 o 3 -NiCr-BN-Si 3 N 4 The granular layer, the thickness of the granular layer is 0.5mm, is overlapped by laser, and the laser phase changeprocess conditions include: laser power 1200W, scanning speed 600mm / min, spot diameter 4mm, overlapping rate 15%.
Embodiment 2
[0028] A method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:
[0029] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;
[0030] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;
[0031] (3) Bond Cr with nitrocellulose on the roughened and cleaned surface 2 o 3 -NiCr-BN-Si 3 N 4 The granular layer, the thickness of the granular layer is 1.5mm, is overlapped by laser, and the laser phase change process conditions include: laser power 2000W, scanning speed 1000mm / min, spot diameter 8mm, overlapping rate 25%.
Embodiment 3
[0033] A method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:
[0034] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;
[0035] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;
[0036] (3) Bond Cr with nitrocellulose on the roughened and cleaned surface 2 o 3 -NiCr-BN-Si 3 N 4 The granular layer, the thickness of the granular layer is 1mm, is overlapped by laser, and the laser phase change process conditions include: laser power 1600W, scanning speed 800mm / min, spot diameter 6mm, overlapping rate 20%.
[0037] The coatings prepared in Examples 1-3, after 2400 hours of actual use, were shut down to check the surface, and no obvious corrosion and abrasion were found, which proves that the coatings prepared by the present invention can solve the defects of the prior art and realize high temperature corrosion resistan...
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Abstract
The invention discloses a laserphase change preparation method of a high-temperature-resisting abrasion-resisting coating of a circulating fluidized bed boiler. The preparation method comprises the steps that 1, the surface of a component of the circulating fluidized bed boiler is subjected to sand blasting to be coarsened; 2, the sand-blast coarsened surface is washed through acetone and ethyl alcohol successively and dried; and 3, a Cr2O3-NiCr-BN-Si3N4 particle layer is bonded to the coarsened and thoroughly-cleaned surface through nitrocellulose, the thickness of the particle layer is 0.5-1.5 mm, laser is adopted for lapping, and laserphase change technological conditions comprise laser power being 1200-2000 W, the scanning speed being 600-1000 mm / min, the spot diameter being 4-8 mm and the lapping rate being 15-25%. The coating can resist high-temperature corrosion and high-temperature abrasion when used for the circulating fluidized bed boiler, and is firm and free of disengagement.
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 combustionsystem is different. Gas-solidmaterial 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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