Unlock instant, AI-driven research and patent intelligence for your innovation.

Boiler flue gas side corrosion detection method based on alternating-current impedance

A technology of AC impedance and boiler flue gas, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, material resistance, etc., and can solve problems such as the inability to evaluate the corrosion degree of boiler tubes of different materials

Pending Publication Date: 2022-01-28
XIAN THERMAL POWER RES INST CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a boiler flue gas side corrosion detection method based on AC impedance, so as to solve the problem that the corrosion degree of boiler tubes of different materials cannot be evaluated, and provide a basis for boiler combustion optimization and heating surface service performance evaluation

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Boiler flue gas side corrosion detection method based on alternating-current impedance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take the P92 material of the boiler superheater tube as an example. Corrosion monitoring device prepared with P92. Measure the open circuit potential and AC impedance. After the open circuit potential is stable, measure the AC impedance. The test is performed at the open circuit potential. The test frequency range is 100kHz to 0.01Hz. The amplitude of the sinusoidal AC signal is 10mV, and the measurement is performed every 15 minutes. Using software to fit the obtained data, the number of parallel loops increases, and the number of output corrosion layers increases.

Embodiment 2

[0032] Take the Super304H material of the boiler superheater tube as an example. Corrosion monitoring device made of Super304H. Measure the open circuit potential and AC impedance. After the open circuit potential is stable, measure the AC impedance. The test is performed at the open circuit potential. The test frequency range is 100kHz to 0.01Hz. The amplitude of the sinusoidal AC signal is 10mV, and the measurement is performed every 15 minutes. Using software to fit the obtained data, the number of parallel loops is reduced, and the output corrosion layer is peeled off.

Embodiment 3

[0034] Take the Inconel625 material of the boiler superheater tube as an example. Corrosion monitoring device prepared with Inconel625. Measure the open circuit potential and AC impedance. After the open circuit potential is stable, measure the AC impedance. The test is performed at the open circuit potential. The test frequency range is 100kHz to 0.01Hz. The amplitude of the sinusoidal AC signal is 10mV, and the measurement is performed every 15 minutes. Use the software to fit the obtained data, the number of parallel circuits has not changed, and the content is not output.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a boiler flue gas side corrosion detection method based on alternating-current impedance, wherein real-time monitoring of high-temperature corrosion conditions by adopting a corrosion monitoring device in a high-temperature corrosion environment in an alternating-current impedance mode. According to the invention, an equivalent circuit is obtained by fitting alternating-current impedance data, and the equivalent circuit is used for judging the corrosion spalling, so that the aim of truly reflecting the corrosion spalling of a high-temperature alloy on the heating surface of a boiler is fulfilled.

Description

technical field [0001] The invention belongs to the field of boiler combustion diagnosis and is closely related to boiler safe operation, in particular to a boiler flue gas side corrosion detection method based on AC impedance, which is used to realize the purpose of on-line monitoring of flue gas side corrosion on a heating surface during boiler operation. Background technique [0002] Among boiler accidents, leakage and damage accidents of heating surface tubes are the most serious and common, accounting for more than 70% of boiler accidents. The service conditions of the boiler heating surface are relatively harsh. On the one hand, due to the high temperature of the tube wall near the flame center; on the other hand, natural gas, coal powder, garbage and other substances will release a large amount of corrosive gases such as sulfide and chloride after burning. Pipelines on the heating surface are prone to high-temperature corrosion when they work in this environment for ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N17/00G01N17/02G01N27/04G01N27/26
CPCG01N17/006G01N17/02G01N27/041G01N27/26
Inventor 周永莉鲁金涛袁勇谷月峰严靖博张鹏党莹樱黄锦阳杨珍尹宏飞李沛刘鹏
Owner XIAN THERMAL POWER RES INST CO LTD