Environmental barrier coating for boiler overtemperature control and preparation method thereof

An environmental barrier and coating technology, applied in the coating, metal material coating process, pressure inorganic powder coating and other directions, can solve the problem of long-term reliable use of thermal insulation coating, etc., to improve the long-term reliable use, reduce The effect of the risk of shedding

Active Publication Date: 2022-07-22
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first purpose of the present invention is to provide an environmental barrier coating for boiler over-temperature prevention to solve the problem that the existing thermal insulation coating cannot be used reliably for a long time question

Method used

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  • Environmental barrier coating for boiler overtemperature control and preparation method thereof
  • Environmental barrier coating for boiler overtemperature control and preparation method thereof
  • Environmental barrier coating for boiler overtemperature control and preparation method thereof

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preparation example Construction

[0055] In addition, the present embodiment also provides a method for preparing an environmental barrier coating for preventing and controlling over-temperature of a boiler, which is used to form the above-mentioned environmental barrier coating for preventing and controlling over-temperature of a boiler on the surface of the furnace tube 1 of the boiler, including the following steps: calculating a furnace The length of the environmental barrier coating and the thickness of the thermal insulation layer 3 need to be set on the tube 1; sandblasting is performed on all areas where the environmental barrier coating needs to be set on the furnace tube 1; the transition layer 2 is sprayed on the surface of the sandblasted furnace tube 1 ; Spray the thermal insulation layer 3 on the surface of the furnace tube 1 sprayed with the transition layer 2 in sections.

[0056] The preparation method of the environmental barrier coating for boiler over-temperature prevention and control is us...

Embodiment 1

[0074] For a 1000MW unit final-stage superheater furnace tube 1, the over-temperature reaches 10 °C through the furnace top temperature measurement point. First, check that the steam inlet temperature of the final-stage superheater is 491 °C. It is detected that the outlet temperature of the furnace tube 1 is 630° C., and the total length L of the furnace tube 1 is 33 m. According to the requirements of the power plant, the cooling range needs to be 15℃. By reasonably selecting the value of the thermal insulation guarantee coefficient β, according to the above formula It can be calculated that the length Lc of the furnace tube 1 that needs to be insulated is 7.12m.

[0075] Then, the surface of the furnace tube 1 is sandblasted, and a transition layer 2 made of NiCrAl is sprayed by plasma spraying with a thickness of 0.25 mm. In order to ensure the reliability of the heat insulation of the furnace tube 1, the length of the transition layer 2 is set to is 9m (greater than Lc...

Embodiment 2

[0083] In view of the over-temperature phenomenon of furnace tube 1 reaching 110 °C found by the panel reheater of a 350MW unit through the temperature measurement points in the furnace, three furnace tubes 1 are taken, and each furnace tube 1 is based on the total length of the environmental barrier coating. Spray for 1.5m. Before spraying, install an in-furnace temperature measuring thermocouple on the surface of the furnace tube 1, and then perform coating spraying on the surface of the in-furnace thermocouple.

[0084] First, the plasma sprayed NiCrAlY (nickel-chromium-aluminum-yttrium) coating with a thickness of 0.22 mm is used in the spraying area of ​​each furnace tube 1 as the transition layer 2; then, the surface of the transition layer 2 is sprayed with yttrium oxide to stabilize oxidation Zirconium (YSZ) is used as the insulating ceramic layer. The insulating ceramic layer of each section of furnace tube 1 is divided into two sections with an interval of 5mm. And ...

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Abstract

The invention provides an environmental barrier coating for boiler overtemperature prevention and a preparation method thereof, relates to the technical field of powder additive manufacturing, and is designed for solving the problem that an existing heat insulation coating cannot be reliably used for a long time. The environmental barrier coating for boiler overtemperature prevention and control comprises a transition layer arranged on the surface of a boiler tube and a heat insulation layer arranged on the surface of the transition layer, and the transition layer is continuous and uniform in thickness; the heat insulation layer is arranged in a segmented mode in the axial direction of the furnace tube, and wave crest characteristics and wave trough characteristics which basically alternate in the axial direction are formed in each section of heat insulation layer. The furnace tube can break through the strain tolerance of a traditional uniform heat insulation coating, so that the stress of coating stripping caused by axial deformation of the furnace tube is effectively reduced, and the environmental barrier coating can be reliably used for a long time.

Description

technical field [0001] The invention relates to the technical field of powder additive manufacturing, in particular, to an environmental barrier coating for boiler overtemperature prevention and a preparation method thereof. Background technique [0002] In recent years, with the improvement of boiler parameters and in-depth peak shaving operation of thermal power units, the overtemperature phenomenon of boiler superheater, reheater and other components has occurred frequently, and the furnace tube temperature of superheater and reheater exceeds the design safety of furnace tube materials. The service temperature and frequent over-temperature will cause the high-temperature parts of the boiler to burst and leak, which will endanger the safe operation of the boiler. At present, in view of the over-temperature phenomenon of boiler furnace tubes, desuperheating water is mainly used to cool down the steam temperature of each stage tube panel. However, since the steam will be hea...

Claims

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Application Information

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IPC IPC(8): C23C4/02C23C4/134C23C4/129C23C4/16C23C4/01C23C4/073C23C4/11C23C24/04
CPCC23C4/02C23C4/134C23C4/129C23C4/16C23C4/01C23C4/073C23C4/11C23C24/04Y02T50/60
Inventor 李勇刘福广张卫军米紫昊施昌富刘刚韩天鹏马军常杨二娟钟良
Owner XIAN THERMAL POWER RES INST CO LTD
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