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Comprehensive System Components: The SBI test equipment includes a trolley, fixed frame, gas sampling hood, collector, J-shaped exhaust duct, centrifugal fan, wind speed control device, comprehensive measurement section, gas analysis cabinet, and a data acquisition system.
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Sample Accommodation: The trolley is designed to hold two vertically oriented sample specimens. At the bottom of the vertical angle, a sand-filled burner utilizing surface ignition is positioned. This setup includes a flame detection system that acts as a fire extinguishing safety feature.
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Fixed Frame and Gas Collection: The trolley is inserted into the fixed frame for testing, which also supports the gas sampling hood. The frame has auxiliary burners fixed in place and is equipped with an additional flame detection system for enhanced safety.
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Stainless Steel Gas Sampling Hood: Positioned at the top of the fixed frame, this hood efficiently collects gases generated during the combustion process.
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Insulated Exhaust Duct: The stainless steel J-shaped exhaust duct, with an inner diameter of 315±5mm, is insulated with 50mm thick high-temperature-resistant mineral wool, ensuring durability and effective smoke extraction.
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Efficient Smoke Extraction: The exhaust system continuously extracts smoke at a speed of 0.50 to 0.65 m³/s, adjustable via a frequency converter for precise control.
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High-Temperature-Resistant Fan: The stainless steel centrifugal fan withstands temperatures up to 300°C, meeting high-temperature calibration requirements.
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Precise Gas Flow Control: The mass flow controller manages the propane flow rate with a measuring range of 0 to 2.5 g/s and an accuracy of at least 1.5%. It automatically adjusts the gas supply to the burner, maintaining a consistent output heat of 30.7±2 kW.
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Advanced Smoke Sampling System: Comprising a smoke ash filter, compressor condenser, drying column, sampling pumps, and a peristaltic pump, this system effectively collects and purifies smoke samples.
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Durable Diaphragm Pump: The diaphragm pump, with a flow rate of 400 l/h, is designed to withstand high temperatures and corrosion, ensuring reliable sample gas collection.
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High-Efficiency Smoke Filter: The filter head is made of solid PTFE and contains a 0.5 μm filtering material, providing high filtration efficiency.
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Compressor Condenser: The condenser has a cooling capacity of 320 KJ/h, with dew point stability of 0.1 degrees and static dew point variation of 0.1 K, ensuring consistent performance. It features a protection rating of IP20.
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Accurate Flow Measurement: The imported rotor flowmeter has a range of 0-5 L/min, precisely regulating the intake airflow of the analyzer.
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Oxygen Analysis: The paramagnetic oxygen analyzer measures oxygen concentration in the gas with a range of 0-25% and a T90 response time of less than 12 seconds.
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CO2 Analysis: The nondispersive infrared CO2 analyzer operates within a range of 0-10%, providing accurate measurements.
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Comprehensive Measurement Section: This section includes a 2155 mm long pipe with pressure probes, three thermocouples, gas sampling probes, and a white light system for thorough testing.
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Bidirectional Probe: Connected to an inlet pressure sensor, this probe has a measuring range of at least 0-100 Pa with an accuracy of ±2 Pa, and a response time of no more than 1 second for 90% output.
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Gas Sampling and Analysis: The gas sampling probe is linked to the gas conditioning device and O2 and CO2 inlet gas analyzers, ensuring precise gas analysis.
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Smoke Attenuation System: A white light-based system installed with a flexible joint on the side pipe of the exhaust duct, ensuring accurate measurement of smoke density.
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Stable Light Source: The system uses an incandescent lamp with a color temperature of 2900±100 K, powered by a stable DC power supply with minimal current fluctuation.
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Precision Lens System: Focuses light into a parallel beam with a diameter of at least 20 mm, ensuring accurate detection. The photomultiplier tube is precisely positioned for optimal performance.
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High-Accuracy Detector: The silicon photodiode probe offers 0.1% linear stability and a 10-bit measurement range, with a spectral distribution response matching the CIE illumination curve, achieving an accuracy of at least ±5%.
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Rapid Response Time: The light attenuation system has a 90% response time of less than 3 seconds, ensuring timely measurements.
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Optical Device Cleanliness: Compressed air is introduced into the side tube to maintain the cleanliness of the optical device, in line with light attenuation drift requirements.
a) Calibration of O2/CO2 analyzer: Calibration of noise and drift in O2/CO2 output, along with result output forms.
b) Calibration of the optical system: Calibration of noise and drift in the smoke measurement system, along with result output forms.
c) Calibration of the filter system: Calibration of the filter films, along with result output forms.
d) Calibration of airflow: Calibration of the airflow control range, along with result output forms.
e) Step calibration along with result output forms.
f) Calibration of n-heptane along with result output forms.
g) Test program along with result output forms.
a) The time lag of O2/CO2 analyzers should not exceed 30s.
b) The response time of O2/CO2 analyzers should not exceed 12s.
c) The response time of burner switching should not exceed 12s.
d) The temperature response time should not exceed 6s.
e) The ratio q gas 30s(t)/HRR 30s(t) should continuously remain within (100±5)%.
f) The difference between the average HRR step 2 and average HRR step 3 should not exceed 0.5 kW.
a) The heat of combustion of n-heptane per unit mass (THR/m) should be (4456±222.8) MJ/kg.
b) The total smoke production of n-heptane per unit mass (TSP/m) should be (125±25) m²/kg.
