| 1. Intake Chamber |
|
| 1.1 Structure |
Made of L-shaped stainless steel plate and components |
| 1.2 Air Inlet |
298.5 mm × 464 mm rectangular opening |
| 2. Combustion Chamber |
|
| 2.1 Length |
7.62 m |
| 2.2 Structure |
Constructed with 230 × 115 × 65 mm refractory bricks; one side is 230 mm vertical to the wall, and the other is 115 mm parallel |
| 3. Observation Window |
|
| 3.1 Placement |
Positioned at the front of the combustion chamber |
| 3.2 Installation |
Placed 152 mm from the combustion chamber mouth, allowing full test sample visibility |
| 4. Burner |
|
| 4.1 Type |
Dual-port elbow combustion nozzle |
| 4.2 Nozzle Diameter |
19 mm |
| 4.3 Nozzle Distance to Center |
102 mm |
| 4.4 Nozzle Opening to Cover Plate |
191 mm |
| 4.5 Test Sample Size |
5.1 mm, ensuring full flame engulfment |
| 5. Trapezoidal Bridge for Cable Sample Installation |
|
| 5.1 Usage |
Supports a single bundled cable or cable in a trough (bus duct) |
| 6. Exhaust Transition Section |
|
| 6.1 Composition |
Includes exhaust section and variable diameter section |
| 7. Exhaust Duct |
|
| 7.1 Length |
5.0 m (from the inner diameter of the 406 mm circular section to the smoke density measurement centerline) |
| 8. Measurement Section |
|
| 8.1 Wind Speed Measurement |
Two-way probe and differential pressure gauge measure wind speed at 500 mm from the smoke density centerline (range: 0.25–100 Pa) |
| 9. Smoke Density Measurement |
|
| 9.1 Installation Position |
5.0 m in front of the straight circular pipe exhaust end |
| 10. Exhaust Duct Valve |
|
| 10.1 Installation |
Electric exhaust valve installed 1.68 ± 0.15 m downstream of the smoke measurement system |
| 10.2 Control System |
Closed-loop feedback system controls air pressure in the combustion chamber air inlet |
| 11. Exhaust Fan |
|
| 11.1 Power |
AC 380V, 50Hz, 3 kW |
| 12. Temperature Measurement in Combustion Chamber |
|
| 12.1 Floor Temperature Test |
Uses a nickel-chromium (K-type) thermocouple with a 1.0 mm wire diameter, 9.5 mm outer sleeve, and 30 mm protruding hot end |
| 13. Analytical Instruments |
|
| 13.1 Oxygen Measurement |
Paramagnetic measurement (SIEMENS, Germany), accurately tracking oxygen percentage changes for combustion heat release analysis |
