GB/T 39809-2021 in English
VALIDMeasuring method of the energy consumption of flat glass furnace
- Issued on:2021-03-09
- Implemented on:2022-02-01
- File Format:PDF
- Delivery:Via email within 5 business days
$369.00
《GB/T 39809-2021平板玻璃窑炉能耗测定方法》由TC255（全国建筑用玻璃标准化技术委员会）归口，主管部门为中国建筑材料联合会。
Introduction
Analysis of the core content of the standard
This standard specifies the technical method for measuring the energy consumption of flat glass furnaces using equipment such as thermocouple thermometers and infrared thermometers, and clearly distinguishes the applicable scenarios of the direct method and the indirect method:
- Direct method: Applicable to working conditions with clear fuel parameters, calculated by fuel consumption + electric boosting amount
- Indirect method: Based on the principle of thermal balance, the total energy consumption is inferred through 9 output energies
Comparison of measurement methods
| Dimensions | Direct method | Indirect method |
|---|---|---|
| Applicable conditions | Fuel data is complete | Fuel parameters are missing or need to be verified |
| Measurement parameters | 4 core data | 23 thermal balance parameters |
| Error source | Calorific value measurement error | Multi-point temperature measurement consistency |
| Operation complexity | ★☆☆☆☆ | ★★★☆☆ |
Key technical points
1. Direct method calculation model
Energy consumption calculation formula:
E = (mr×Qdw+Qd)/mb
Among them, the electric melting heat Qd needs to be converted into standard coal at 0.1229kgce/(kW·h)
2. Indirect method heat balance system
The system boundary clearly includes 6 functional areas such as the melting part and the clarification part. When using corundum protective sheath thermocouple for measurement:
- Insertion depth of glass liquid ≥50mm
- Tolerance of Class I precision thermocouple ≤±1.5℃
Implementation suggestions
Instrument selection specifications
- Infrared thermometer: accuracy ≥2% or ±2℃
- Ultrasonic flowmeter: accuracy ≥Grade 1
- Ostwald gas analyzer: used for O2/CO/CO2 component analysis
Key points of quality control
- The measurement hole position should avoid elbows and reducers
- Flue gas composition measurement should be carried out at the center of the mainstream area
- Cooling water flow measurement should meet the 10D straight pipe section requirement
Standard evolution analysis
Compared with the old industry regulations, this standard has the following major breakthroughs:
- New formula for calculating energy consumption of electric boosting
- Three types of calculation methods for orifice radiation heat dissipation are clarified
- Appendix A provides 28 energy conversion coefficients
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