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Preparation device and method for oxidation resistant coatings on inner walls of boiler header and pipe base

An anti-oxidation coating, boiler header technology, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of insufficient anti-steam oxidation ability, achieve control of vapor deposition rate and exhaust emission, The effect of avoiding tissue degeneration

Pending Publication Date: 2019-06-07
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of insufficient steam oxidation resistance of the boiler header and pipe seat, the present invention provides a preparation device and method for an anti-oxidation coating on the inner wall of the boiler header and pipe seat, which can significantly improve the oxidation resistance of the inner wall of the header and pipe seat

Method used

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  • Preparation device and method for oxidation resistant coatings on inner walls of boiler header and pipe base
  • Preparation device and method for oxidation resistant coatings on inner walls of boiler header and pipe base
  • Preparation device and method for oxidation resistant coatings on inner walls of boiler header and pipe base

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preparation example Construction

[0030] A method for preparing an anti-oxidation coating on the inner wall of a boiler header and a pipe seat according to the present invention comprises the following steps:

[0031] 1) Close the second valve 7, open the third to fifth valves 8 to 10 at the same time, use the mechanical pump to evacuate the pipeline system through the first valve 6, and close the first to fourth valves when the vacuum degree of the system is higher than 1000Pa 6-9 and the sixth valve 11;

[0032]2) Turn on the first heating furnace 1, and heat the header, the pipe seat 2 and the penetrating agent tank 3 to be prepared for the inner wall coating at the same time, and keep the heating curve consistent. Set the final heating temperature and holding time according to the material of the header and pipe seat, and the final heating temperature range is 600-950°C;

[0033] 3) During the heating process, the material in the penetrating agent tank 3 is heated and decomposed, and the through hole on t...

Embodiment 1

[0037] Prepare an anti-oxidation coating on the inner wall of the header and pipe seat made of P92, and weld the header and pipe seat that have been degreased and derusted on the inner wall to the pipeline system. After measurement, the area of ​​header and pipe seat 2 to be prepared with inner wall coating is about 20m2 2 , osmosis agent tank 3 is put into 15KG osmosis agent. According to the heat treatment process of P92 material and weld seam, the final heating temperature is 760°C and the holding time is 6h.

[0038] The morphology of the prepared inner wall coating is as follows figure 2 , the distribution of the main elements of the coating see image 3 .

[0039] The weight gain curve of saturated steam oxidation at 650℃ for 500h is shown in Figure 4 .

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Abstract

The invention discloses a preparation device and method for oxidation resistant coatings on inner walls of a boiler header and a pipe base. The oxidation resistance of the inner walls of the boiler header and the pipe base can be remarkably improved. According to the preparation device and method, the coatings are prepared on the inner walls of the header and the pipe base through a vapor deposition method, and the sealed header and the pipe base serve as a part of an air path. The preparation device specifically comprises a heating furnace and a connection loop which is composed of the headerand the pipe base with the inner walls to be provided with the coatings, an impregnation agent tank, an air path guide pipe, a gas circulating pump, a valve, an air pumping / exhausting pipeline and acounterbalance valve. The final heating temperature and the heat insulation time are set according to the materials of the header and the pipe base and a heat processing process, and the oxidation resistant coatings with the different thicknesses can be prepared. The preparation device is simple, low in manufacturing cost and very high in engineering practical value, and the vapor oxidation resistance of the header and the pipe base can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of boiler manufacturing, and in particular relates to a preparation device and method for an anti-oxidation coating on the inner wall of a boiler header and a pipe seat. Background technique [0002] The header is also called the header, which collects or distributes the working medium of steam and water, reduces the transmission and connection pipes of the working medium, and reduces the number of holes in the drum, which is conducive to improving the safety performance of the drum. In recent years, the header steam temperature of the unit that has been put into commercial operation has reached 620 degrees Celsius, and the header wall temperature is close to 640 degrees Celsius. The header steam temperature of the 630-650 degrees Celsius unit that is being designed and developed will be higher. To meet the needs of thermal expansion and welding performance, boiler headers and pipe seats are mostly made of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/08
Inventor 鲁金涛黄锦阳杨珍张醒兴周永莉袁勇党莹樱严靖博尹宏飞谷月峰
Owner HUANENG POWER INTERNATIONAL
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