DL/T 1602-2024 in English
VALIDOnline measurement method for hydrogen conductivity of pure water degassing in power plant
- Issued on:2024-05-24
- Implemented on:2024-11-24
- File Format:PDF
- Delivery:Via email within 1~3 business days
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| Standard No: | DL/T 1602-2024 |
| Document status: | VALID |
| Title in English: | Online measurement method for hydrogen conductivity of pure water degassing in power plant |
| Title in Chinese: | 发电厂纯水脱气氢电导率在线测量方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-05-24 |
| Implemented on: | 2024-11-24 |
| Chinese Classification: | F24-Electric power testing technique |
| Professional Classification: | DL-Electricity |
| Related Keywords: | online measurement method
edition technical significance degassing method gas purge method new gas purge method new verification method |
Introduction
Core changes in the standard revision
| Revision dimensions | 2016 edition | 2024 edition | Technical significance |
|---|---|---|---|
| Degassing method | Only boiling method is specified | New gas purge method and membrane degassing method | Adapt to different working conditions |
| Instrument configuration | Traditional resin column | Add continuously electrically regenerated cation exchanger | Reduce maintenance frequency |
| Accuracy verification | Unspecified | Added 20μg/L Cl⁻ standard solution verification | Error control ±10% |
Analysis of key technologies
1. Comparison of degassing methods
Boiling method requires heating the water sample to the local boiling point, which is suitable for high temperature conditions but has high energy consumption; Gas purge method uses 99.99% pure nitrogen for reverse purge, and attention should be paid to nozzle design to prevent bubble residue; Membrane degassing method separates gas through a semi-permeable membrane, which is suitable for continuous monitoring scenarios.
2. Key instrument requirements
- Conductivity meter: must have automatic non-linear temperature compensation function for acidic media
- Cation exchange device: resin column needs to be regenerated regularly, and electrical regeneration type can reduce maintenance costs
- Degassing device: carbon dioxide removal rate should be ＞95%
Measurement error control
The new verification method added to the standard requires the preparation of a 20μg/L chloride ion standard solution, whose theoretical hydrogen conductivity is 0.2427μS/cm. Machine error calculation formula:
δc=(ci-ca)/κa×100%
When the error is greater than ±10%, it is necessary to check in sequence: cation exchange efficiency → degassing device performance → conductivity electrode calibration.
Carbon dioxide content conversion
After calculation through the formula in Appendix A SCCO2=CC-(DGCC-0.055), the precise content can be obtained by looking up the table:
| SCCO2(μS/cm) | CO2 content(mg/L) | Typical application scenarios |
|---|---|---|
| 0.19-0.32 | 0.04-0.1 | Qualified water supply |
| 0.48-1.17 | 0.2-1.0 | System leakage warning |
| ＞3.88 | ＞10.0 | Severe corrosion risk |
Implementation recommendations
- Method selection: The boiling method is preferred for high-temperature units, and the membrane degassing method is recommended for nuclear power units
- Quality control frequency: Use 20μg/L Cl⁻ standard solution to verify system accuracy every week
- Interference treatment: The resin column needs to be backwashed regularly to prevent bubble accumulation and maintain a flow rate of 0.5-1.5L/min
Standard evolution trend
This revision reflects three major technical development directions: ① Improved real-time requirements for online monitoring ② Stricter measurement accuracy ③ Intelligent equipment (such as the application of electrical regeneration technology). It is expected that the next version will add new technical requirements such as artificial intelligence-assisted diagnosis and multi-parameter fusion analysis.
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