Delivered for the battery safety testing laboratory at Guangzhou Customs Huadu Base — a five-stage gradient purification train engineered for instantaneous high-concentration, high-temperature, multi-pollutant exhaust from lithium battery nail-penetration, crush, short-circuit, overcharge and thermal-runaway tests.
Battery safety testing (nail penetration, crush, forced short-circuit, overcharge/over-discharge, thermal runaway and fire tests) generates instantaneous exhaust containing:
A single-process system cannot meet compliance. We engineered a gradient-purification train that removes each pollutant class in sequence, protecting downstream precision equipment:
| Compliance Target | Result |
|---|---|
| Particulate matter | ≤ 30 mg/m³ · removal ≥ 99% |
| Acid gas (HF / HCl) | removal ≥ 95% |
| VOCs | removal ≥ 98% |
| Collection | Fully enclosed, negative pressure, zero leakage |
Dust first, then de-acidification, then aerosol polishing, and finally deep VOCs destruction — pre-treatment protects the precision stages downstream.
First defence: intercepts coarse carbon black and metal dust before it can blind the wet stages. Full stainless steel body, PTFE-membrane anti-acid bags, on-line pulse cleaning, hopper + rotary discharge valve + DP monitoring. Efficiency ≥ 99.5% on coarse and medium dust.
Cooling + de-acidification in one unit: swirl vanes centrifuge out fine dust while multi-stage alkaline spray (10–15% NaOH + buffer solution) neutralises HF/HCl. Cuts gas temperature from up to 180 °C to below 40 °C. Packing-free design — no blockage risk under sticky, high-load conditions.
Polishing stage for 0.01–10 µm sticky aerosols, electrolyte mist and salt crystals that dry collectors cannot capture. High-voltage field charges particles onto water-flushed collecting plates — self-cleaning, no re-entrainment. Eliminates white plume; removal ≥ 99% of ultra-fine aerosols.
Three-chamber box with waterproof honeycomb carbon (iodine value ≥ 800 mg/g) — chambers alternate between adsorption and desorption for 24 h non-stop operation. Water-resistant media tolerates the humid post-scrubber stream without crumbling.
Concentrated VOCs are desorbed and destroyed over a Pt/Pd catalyst at 300–400 °C — no open flame, no NOx — converting organics to CO₂ and H₂O. Plate heat exchanger recovers ≥ 85% of the heat to drive carbon-bed desorption, keeping running cost low.
Negative-pressure sealed hoods and anti-corrosion ducting, variable-frequency corrosion-resistant centrifugal fan, PLC central control with one-touch start/stop, condition monitoring, fault alarms and data logging.
Thermal-runaway tests carry real deflagration risk. The whole train is protected by dedicated safety engineering:
Guangzhou Customs Huadu Base, May–June 2026: structural steel foundations, equipment hoisting, ducting installation and the completed multi-stage purification train.
We design the same gradient-purification approach for any hard-to-handle exhaust stream. Send us your process and pollutant list — written proposal within 24 hours.
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