Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Heated surface tube inner oxide skin accumulation condition detection method

A technology of heating surface tubes and oxide skins, which is applied in the direction of measuring devices, instruments, and electrical devices

Inactive Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +2
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle is based on the fact that the oxide scale is ferrimagnetic, and the presence or accumulation of oxide scale is evaluated by measuring the magnetized oxide scale signal inside the paramagnetic austenitic tube outside the tube. Therefore, this method is only applicable to austenitic stainless steel. The oxide skin detection of the tube is powerless for the high temperature heating surface tube of ferritic steel

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
  • Heated surface tube inner oxide skin accumulation condition detection method
  • Heated surface tube inner oxide skin accumulation condition detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The concrete steps of this method are as follows:

[0016] 1. Wrap the excitation coil on the heating surface tube to detect the amount of scale accumulation, and pass a low-frequency alternating current below 50 Hz to the coil. The effective penetration depth of the current is greater than the thickness of the tube wall and can penetrate the thickness of the oxide scale accumulation;

[0017] 2. Wrap the measuring coil at a certain distance L away from the exciting coil on the tube of the heating surface to be tested;

[0018] 3. Measure the induced electromotive force at both ends of the coil described in step 2;

[0019] 4. Compare the measured data with the test data to judge the amount of oxide scale accumulation on the inner wall of the pipe.

[0020] Although this method also adopts magnetic detection scale, but the magnetization mode is different, and the scope of the detected heating surface tube is also different. Using the present invention can not only dete...

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 heated surface tube inner oxide skin accumulation condition detection method. The method comprises the following steps: an exciting coil is wound around a heated surface tube of which the oxide skin accumulation volume is to be detected, and the coil is energized with a low-frequency alternating current of which the frequency is less than 50Hz; a measuring coil is wound around the detected heated surface tube at a position which is away from the exciting coil for a certain distance L; the induced electromotive force E of two ends of the coil described in the step2 is measured; and the measured data is compared with the test data to judge the tube inner wall oxide skin accumulation volume. The method has the advantage of convenient operation, the method can be used to perform fast detection on heated surface tube inner oxide skin accumulation volume, and the tube explosion accident of a boiler heated surface tube due to oxide skin accumulation can be prevented well.

Description

technical field [0001] The invention relates to a method for detecting the accumulation of oxide skin in a heating surface tube. technical background [0002] With the development of thermal power generation technology, super (super) critical units have been widely used. However, the scales on the inner wall of the high-temperature superheater tube of the unit frequently occur and accumulate on the lower part of the tube, blocking the heating surface tube and causing a tube burst accident, which seriously threatens the safety of the generator set and has a major impact on power production and its stability. At present, there are mainly two methods for detecting the oxide scale in the heating surface tube: ray detection method and magnetic detection method. Due to the limitation of the detection space of the local high-temperature heating surface tube row, the ray detection method cannot perform comprehensive detection, and also has disadvantages such as radiation and long c...

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): G01B7/00
Inventor 刘长福冯砚厅吴楠陈二松
Owner STATE GRID CORP OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com