The 20L spherical explosion test system is used to determine the maximum pressure Pmax and maximum pressure rise rate (dp/dt)max of dust cloud explosion under specific test conditions, and to evaluate the explosion hazard of dust cloud. Use 20bar compressed air to diffuse the dust into the 20L ball, use two 5kJ chemical ignition heads to ignite the dust cloud, measure the changes in pressure and time to obtain a curve, and determine the maximum explosion pressure and maximum pressure rise rate for each test. Perform a series of tests on various concentrations within a wide range to find the maximum values of Pm and (dP/dt)m, that is, Pmax and (dP/dt)max. Calculate the maximum explosion index Kst from the (dP/dt)max result to classify the dust.
This test complies with the requirements of ASTM E1226, BS 6713, ISO 6184.Part 1 (1985) (Explosion Prevention Systems. Part 1: Test Method for Explosion Index of Combustible Dust in Air) and GB/T 16426 (Limiting Oxygen Concentration; 20-liter ball; 20-liter ball explosion test; Dust cloud explosibility test; Kst explosion index; Pmax maximum explosion pressure; Dust explosion test; Explosion pressure rise rate; LOC; MEC; Ignition delay time; Minimum explosion concentration).
Dust explosion hazards lurk in the operation process of powder handling, and their impact can be catastrophic, resulting in huge property losses and serious threats to human life. A comprehensive understanding of flammability, ignition sensitivity and explosion intensity is the key to safe handling of dust. Laboratory testing is an important part of the qualitative and quantitative analysis of relevant parameters. Accurate laboratory test data helps to select methods to prevent dust explosions and corresponding protective measures, reducing the hazards of dust explosions to a controllable range (20 liter ball; 20 liter ball explosion test; dust cloud explosibility test; Kst explosion index; dust explosion test; explosion pressure rise rate; MEC; ignition delay time; limiting oxygen concentration; minimum explosion concentration; LOC; Pmax maximum explosion pressure).
Technical Parameters:
1.Ball volume: 20L
2. Ball pressure resistance: 40bar
3. It can test the explosion parameters of dust, gas, and the mixed system of solid, gas and liquid.
4. The entire sealing cover is controlled by a robotic arm and can hover at any position, making it convenient for operators to install the ignition head and clean the sealing cover to ensure safe operation.
5. The software can automatically control the vacuum system to perform vacuum operation inside the ball. When the target vacuum degree is reached, the pneumatic actuator will close automatically.
6. Automatic gas distribution device: the operator only needs to input the target oxygen concentration value on the instrument control software, and the gas distribution device can automatically calculate and complete the gas distribution according to the requirements.
7. Absolute pressure sensor, range: 0-5bar
8. Dust diffusion container: capacity 0.6L.
9. Dust diffusion quick start valve: connected to the conical bottom of the dust diffusion container, connected to the sphere through the curved connecting part, it can completely diffuse the dust into the sphere without residue.
10. Ignition delay time: 60±5 ms.
11. Pressure sensor: 0-250 bar
12. Pressure test channels: 2, to ensure accurate and effective collection of pressure signals from the explosion system, with 1 test port reserved.
13. Armored glass viewing window: It can be equipped with high-speed cameras or other optical electronic equipment to study the flame propagation of the combustion process.
14. Operating software: Professional operating software, easy to use, user-friendly interface, powerful functions. Fully automatic control of the entire test process, automatic vacuuming, automatic calculation and completion of gas distribution, automatic pressure relief and purge after the test. With self-calibration, self-detection, self-calibration, self-correction capabilities. Automatic data collection and analysis, automatic generation of experimental reports after the test is completed.
15. Weight: 900Kg.
Standards
ASTM E1226: Standard Test Method for Explosibility of Dust Clouds
ASTM E1515: Standard Test Method for MEC - minimum explosible concentration of combustible dusts
EN 14034-1: Determination of the maximum explosion pressure Pmax of dust clouds
EN 14034-2: Determination of the maximum rate of explosion pressure rise (dp/dt)max of dust clouds
EN 14034-3: Determination of the lower explosion limit LEL of dust clouds
EN 14034-4: Determination of the limiting oxygen concentration LOC of dust clouds
EN ISO/IEC 80079-20-2: Explosive atmopheres. Material characteristics. Combustible dust methods
EN ISO/IEC 80079-20-2
GB/T 16425
GB/T 16426
GB/T 803
ISO/IEC 6184/1
ISO/IEC 6184/2
ISO/IEC 80079-20-2
