SH/T 1549-2020 in English
VALIDLight olefins for industrial use - Determination of water - Guidelines for application of online analysers
- Issued on:2020-12-09
- Implemented on:2021-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
Introduction
Analysis of the Evolution of Standard Technology
| Technical Indicators | 1993 Edition | 2020 Edition | Improvement Points |
|---|---|---|---|
| Detection Methods | 3 Types | 6 Types | Newly Added Near-infrared Laser/Wavelength Shift Spectroscopy |
| Silicon Oxide Sensor | Not Included | Newly Added | Expanded Application Range of Capacitance Method |
| Measurement Range (mL/m³) | 0.1-25,000 | 0.01-200,000 | Lower limit reduced by 10 times |
Analysis of core detection technology
1. Electrolytic moisture meter
Using the principle of phosphorus pentoxide electrolysis, the measurement range is 0.1-1000 mL/m³. Suitable for C2 olefins such as ethylene, but C3+ olefins are prone to polymerization interference.
2. Near-infrared spectroscopy technology
Laser absorption type: Based on Lambert-Beer's law, the detection limit is 0.03 mL/m³, the response speed is <10 seconds, and it is suitable for corrosive gas environments.
Wavelength migration type: Through the selective penetration of 0.28nm water molecules, gas/liquid samples can be measured simultaneously, and the maintenance cycle is extended by more than 50%.
Implement key control points
- Anti-adsorption design: The sampling pipeline must be heated to above 50℃ and the length must not exceed 3 meters
- Dynamic calibration: A saturation method/permeation method generator must be used, and static gas distribution is prohibited
- Safety protection: All electrical equipment must comply with Ex dⅡBT4 explosion-proof grade
Result presentation specifications
Volume fraction (ϕ) and mass fraction (w) conversion formula:
w = ϕ×18.01/M
Where M values: ethylene28.05, propylene42.08, butadiene54.09
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