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

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: 2017-01-04
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

[0017] A method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:

[0018] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0019] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0020] (3) Plasma spray Cr on the roughened and cleaned surface 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

[0022] A method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:

[0023] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0024] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0025] (3) Plasma spray Cr on the roughened and cleaned surface 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

[0027] A method for preparing a high-temperature-resistant and anti-abrasion coating for a circulating fluidized bed boiler, comprising:

[0028] (1) roughen the surface of circulating fluidized bed boiler components by sandblasting;

[0029] (2) wash the surface roughened by sandblasting successively with acetone and ethanol, and dry;

[0030] (3) Plasma spray Cr on the roughened and cleaned surface 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.

[0031] The coating prepared in Example 1-2, after 100 hours of actual use, was shut down to check the surface, and no obvious corrosion and abrasion were found, which proves that th...

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Abstract

The invention discloses a preparation method of a high-temperature-resistant abrasion-resistant coating of a circulating fluidized bed boiler. The method comprises the following steps of (1) performing sand-blasting roughening on the surface of a circulating fluidized bed boiler component; (2) sequentially washing the surface subjected to the sand-blasting roughening by acetone and ethyl alcohol; performing drying; (3) performing plasma spraying of Cr3C2-NiCr-WC particles on the roughened and cleanly cleaned surface, wherein the plasma spraying process conditions include the values as follows: the main gas pressure is 0.7 to 1.0MPa; the auxiliary gas pressure is 0.6 to 0.9 MPa; the main gas flow rate is 1300 to 1800 l / h; the auxiliary gas flow rate is 900 to 1100 l / h; the arc current is 450 to 600A; the arc voltage is 85 to 100 V; the powder conveying gas pressure is 0.2 to 0.4 MPa; the powder conveying gas flow rate is 280 to 400 l / h; the spraying distance is 100 to 150 mm; the spraying speed is 2 to 3 kg / h; the coating thickness is 1 to 2.5 mm. When the coating is used for the circulating fluidized bed boiler, high-temperature correction resistance and high-temperature abrasion resistance can be realized; in addition, the coating is firm and cannot fall off.

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): C23C4/134C23C4/06C22C29/06
CPCC23C4/06C22C29/06
Inventor 张达明
Owner WUXI MINGSHENG TEXTILE MACHINERY
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