DL/T 1679-2024 in English
VALIDTechnical requirements for calcined petroleum coke for high voltage DC grounding electrodes
- Issued on:2024-12-25
- Implemented on:2025-06-25
- File Format:PDF
- Delivery:Via email within 1~3 business days
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$329.00
| Standard No: | DL/T 1679-2024 |
| Document status: | VALID |
| Title in English: | Technical requirements for calcined petroleum coke for high voltage DC grounding electrodes |
| Title in Chinese: | 高压直流接地极用煅烧石油焦炭技术条件 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-12-25 |
| Implemented on: | 2025-06-25 |
| ICS Classification: | 29.050-Conducting materials |
| Professional Classification: | DL-Electricity |
| Related Keywords: | petroleum coke
petroleum coke particle size distribution technical requirements inspection items type test key technical indicators core parameters |
Introduction
Core changes in the standard revision
| Type of change | 2016 version | 2024 version |
|---|---|---|
| Definition adjustment | Including 5 items such as petroleum coke and thermal conductivity | Only 8 items such as calcined petroleum coke are retained |
| Technical requirements | 12 items such as iron content and silicon content | Integrated into 9 items of physical and chemical properties |
| Test method | 5 methods such as thermal conductivity | Delete 3 methods and optimize 4 methods |
Analysis of key technical indicators
Core parameters of calcined petroleum coke - Particle size distribution: 35~100 mesh accounts for 60%-90% (2016 version is 50%-85%)
- Resistivity: ≤1×10⁻³Ω·m (test pressure 3.9MPa±0.03MPa)
- Tap density: 0.9-1.1g/cm³ (true density ≥2g/cm³)
Key control points of production process
Calcination process
AdoptDouble-roll crusher + Raymond mill combination equipment, to ensure:
- Calcination temperature 1300℃±50℃ for 48 hours
- Screening system complies with the 35/100 mesh standard sieve in Appendix B
- Moisture control ≤0.1% (drying temperature 110℃±5℃)
Key points for inspection implementation
| Inspection type | Sampling requirements | Required inspection items |
|---|---|---|
| Type test | 5 years/process change | All items |
| Factory test | Every 2000 tons batch | Appearance/Particle size/Resistivity |
| Acceptance test | Third-party testing | Moisture/True porosity, etc. |
Standard application recommendations
Power Engineering Implementation Guide
In the construction of land grounding electrodes, attention should be paid to the following:
- Materials with a true porosity of 45%-55% are preferred
- Moisture-proof transportation (refer to GB/T191)
- Retain double backup samples as required by Article 7.3.3
Sample only — not a preview of DL/T 1679-2024
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