1、 Preparation before equipment installation

Site and equipment inspection

The explosive container is made of 316 stainless steel material, designed to withstand a pressure of 3.0MPa, and its sealing needs to be verified through a hydrostatic test. Check the electrical connections of the water circulation interlayer (temperature control range of room temperature -220 ℃), dual channel pressure sensor (0-10MPa, resolution 0.001MPa), and ignition system (chemical/electrostatic dual-mode, energy 2kJ/10kJ or 15kV/0.5s) for stability, ensuring no leakage or looseness.

Install armored glass observation window (diameter 40mm), safety relief valve and emergency stop button, and equip with remote wireless ignition device to ensure a safe distance of ≥ 5m for operators.

Environment Settings

Vacuumize to 0.06MPa to eliminate residual gas, adjust the temperature of the water circulation interlayer to the required range for the experiment (such as 20-150 ℃), ensure that the environmental humidity is less than 85% RH, and avoid temperature fluctuations affecting the accuracy of explosion parameters.

2、 Installation steps of 20L ball explosion tester

Sample preparation and loading

Weigh combustible dust (such as aluminum powder and coal dust) according to the experimental concentration (such as 750g/m ³) and load it into a powder storage tank, then tighten the tank lid. Install the ignition head to the center of the sphere, fix the exposed copper wire with a crimping screw, and ensure that the bottom of the ignition head is horizontally aligned with the two screws on the ignition rod.

System parameter configuration and execution

After entering the target concentration, start the automatic process: cleaning → vacuuming → gas distribution → powder spraying (2.0MPa compressed air disperses dust through a rebound nozzle) → ignition (automatically triggered after a delay of 60ms) → data acquisition (pressure time curve, flame temperature 0-1000 ℃, high-speed camera 100ks/s).

Set test parameters through software: temperature range (room temperature -500 ℃), pressure range (atmospheric pressure -10MPa), constant temperature time (10-30min), and accurately adjust gas concentration using a mass flow controller.

Data Collection and Analysis

Real time monitoring of pressure time curve, extraction of maximum explosion pressure (Pmax) and maximum pressure rise rate (dp/dt) max, calculation of explosion index (Kst, MPa · m/s) based on GB/T16425 standard, and evaluation of dust explosion intensity level (St1-St3).

3、 Safety Protection and Emergency Response of 20L Ball Explosion Tester

Operating Specifications

It is prohibited to disassemble equipment under pressure and use explosion-proof tools; Experimental personnel are required to wear protective equipment (heat-resistant gloves ≥ 500 ℃, protective face shields) and maintain a safe distance.

Exhaust gas treatment: After testing, discharge it outdoors and blow the pipeline with inert gas (nitrogen/argon, purity ≥ 99.99%) at least 5 times to avoid residual risks.

emergency measures

When the pressure fluctuates abnormally or exceeds 3.0MPa, the pressure relief device will be automatically triggered; Configure dry powder fire extinguishers, emergency shutdown buttons, and develop leak handling plans (such as inert gas covering leak points).

Regular maintenance and verification

Monthly verification of pressure sensors, temperature sensors, and flow controllers; Replace gas filters every quarter and perform ultrasonic cleaning of gas pipelines; Check the accuracy of thermocouples every six months (calibration is required for deviations>± 1 ℃) to ensure long-term stable operation of the equipment.

4、 Application scenarios and value

The 20L ball type explosion tester is widely used in fields such as chemical engineering, energy, and materials. By measuring the explosion parameters (such as Pmax, Kst, and explosion limit) of dust, gas, and solid/gas mixed systems, it provides explosion-proof design basis for enterprises, optimizes ventilation systems, reduces explosion risks, and ensures production safety. Its "dispersion ignition measurement analysis" four step method, combined with remote control and automatic data collection, achieves a safety management upgrade from "post remediation" to "pre prevention".