GB/T 39296-2020 in English
VALIDOperation effect evaluation of recirculating cooling water treatment—Method of monitoring heat exchanger
- Issued on:2020-11-19
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 39296-2020循环冷却水处理运行效果评价 监测换热器法》由TC63（全国化学标准化技术委员会）归口，TC63SC5（全国化学标准化技术委员会水处理剂分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Interpretation of the core content of the standard
This standard specifies a complete technical system for evaluating the operating effect of the circulating cooling water system by using monitoring heat exchangers, with the key points including:
- Structural parameter requirements of three-tube heat exchangers (tube center distance 31mm, effective heat transfer area 0.055㎡)
- Test tube material matching principle (must be consistent with the material of the main system heat exchanger)
- Key operating parameter control standards (flow rate 1.5-2.0m³/h, steam temperature 97-104℃)
Comparative analysis of technical indicators
| Evaluation indicators | Calculation method | Control requirements | Monitoring period |
|---|---|---|---|
| Corrosion rate | Mass loss method (Formula 1) | Carbon steel＜0.075mm/a | 1 month |
| Adhesion rate | Deposition increment method (Formula 2) | ＜15mcm | 1 month |
| Thermal resistance value | Inverse of heat transfer coefficient (Formula 3) | ＜3.5×10⁻⁴㎡·K/W | Real-time monitoring |
Key technical innovations
1. Multi-parameter linkage monitoring system
The standard innovatively combines the pressure drop monitoring tube (biological slime), online corrosion probe (instantaneous corrosion rate) and traditional test tube detection to form a three-dimensional evaluation matrix. The application case of a petrochemical enterprise shows that the system can warn the scaling trend of the system 72 hours in advance.
2. Intelligent data collection requirements
It is clearly required to configure a PLC or DCS system to realize minute-level data collection of parameters such as flow, temperature, and pressure difference. Compared with the traditional manual recording method, the data reliability is improved by 40%.
Key points for implementation
- Installation specifications: The monitoring heat exchanger should be ≤5m away from the main system water supply pipe to ensure representative water quality
- Key to pre-treatment: The concentration of test tube pickling must be strictly controlled according to Table B.1 (10% hydrochloric acid + 0.5% corrosion inhibitor)
- Abnormal handling: When the pressure difference increase is ＞50%, the biological sludge condition should be checked immediately
Standard evolution analysis
Compared with the original industry practice, the main breakthroughs of this standard are:
- The test tube specifications (Φ19×2mm) are unified to solve the problem of incomparable previous data
- A new correction factor for stainless steel corrosion rate (7.92g/cm³)
- A dynamic calculation model of thermal resistance is introduced to improve the accuracy of scaling evaluation
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 6903-2022 in English
Analysis of water used in boiler and cooling system—General rule
2022-03-09
