GB/T 37241-2018 in English
VALIDGuide on inerting for the prevention of explosions
- Issued on:2018-12-28
- Implemented on:2019-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$592.00
《GB/T 37241-2018惰化防爆指南》由TC288（全国安全生产标准化技术委员会）归口，TC288SC5（全国安全生产标准化技术委员会粉尘防爆分会）执行，主管部门为应急管理部。
Introduction
Interpretation of the core content of the standard
Comparative Analysis of Inerting Methods
| Method | Applicable Conditions | Number of Air Changes | Energy Efficiency Ratio |
|---|---|---|---|
| Pressure Inerting | Pressure Equipment (≥0.1MPa) | 3-5 Times | ★★★★ |
| Vacuum Inerting | Negative Pressure System | 2-3 Times | ★★★☆ |
| Purge Inerting | Normal Pressure Open System | 5-10 times the volume | ★★☆☆ |
Key parameter calculation
Three-level setting of safety margin
- LOC: Experimental determination of limiting oxygen concentration
- MAOC = LOC - 2% (normal operating conditions)
- TPSS = MAOC ×60% (continuous monitoring)
Example: If the LOC of a certain coal powder is 12%, the operating MAOC should be ≤10%, and the interlock shutdown value should be ≤6%
Typical application cases
Inerting of coal chemical pulverizing system
Using class=instrument>Flue gas + nitrogen double inerting, control oxygen concentration <8%:
- Oxygen concentration monitoring point is set at the outlet of the hot blast furnace
- Negative pressure protection is implemented for the coal powder collector
- Rotary valve is equipped with nitrogen seal
Implementation suggestions
Key points for selecting oxygen monitoring system
| Electrochemical type | Applicable to conventional industrial environments, with a service life of 12 months |
| Zirconium oxide type | High temperature conditions (＞550℃), response speed <1s |
| Paramagnetic type | High-precision measurement, requiring a matching sampling system |
Note: The difference in wet/dry basis measurements needs to be calibrated, and water vapor is counted as an inert component
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