316L stainless steel spray tower

316L Stainless Steel Spray Tower Operating Principle and Applicable Gas Environment

I. Operating Principle (Same as PP/PPH Tower Process, but Different Materials and Operating Conditions)
1. Exhaust gas enters the tower tangentially, rising through the equalizing section to the packing/spray section;
2. 316L nozzles at the top of the tower atomize NaOH, H₂SO₄, or other chemical solutions into droplets, which come into countercurrent contact with the gas;
3. A liquid film forms on the surface of the 316L Pall ring or stepped ring packing, removing pollutants through absorption, dissolution, neutralization, or redox reactions;
4. The purified gas containing droplets continues through a 316L wire mesh or baffle demister, where it is dehydrated and discharged to standard conditions;
5. Waste liquid is collected in a 316L circulation tank at the bottom of the tower. After automatic dosing and filtration, it is recycled by a 316L pump until it meets discharge standards or is outsourced for treatment.

2. 316L Material Advantages
• Contains 23% Mo, offering over 30% higher resistance to Cl⁻ pitting and crevice corrosion than 304;
• Can withstand long-term use in high-temperature exhaust gases at 80-150°C without deformation or aging;
• High mechanical strength, capable of withstanding pressure fluctuations exceeding ±5 kPa, making it suitable for high-pressure induced draft systems.

III. Typical Applicable Gas Environments
| Industry | Gas Media Examples | Features |
| Chemical/Pharmaceutical | HCl, Cl₂, SO₂, HF, H₂S | High concentration, highly corrosive, halogen-containing |
| Electroplating/Pickling | Chromic acid mist, hydrogen cyanide, nitric acid mist | Contains heavy metal ions, highly oxidizing |
| Waste Incineration | HCl+SO₂+HF gas mixture, dioxin precursors | High temperature, high humidity, complex composition |
| Metallurgy/Electronics | NOₓ, ammonia, silane, phosphine | Fluorine-containing and silicon-containing dusts and strong acids and alkalis |
| Laboratory | Acid-base mixed exhaust gas, organic solvent vapor | Large concentration fluctuations, intermittent emissions |

IV. Comparison with PP/PPH Tower Selection
• Temperature > 60°C or containing fluorine or high chloride ions → Select 316L;
• Containing hydrofluoric acid or high-temperature concentrated sulfuric acid → Upgrade to 904L or Hastelloy;
• For room-temperature weak acid and alkali or cost-sensitive projects, choose PP/PPH.

The 316L stainless steel spray tower utilizes a countercurrent spray-packing mass transfer mechanism, maintaining a purification efficiency of ≥95% and a service life of over ten years even in high-temperature, high-chloride, highly oxidizing, or highly reducing waste gas scenarios. It is the preferred choice for treating corrosive waste gas in industries such as chemical, electroplating, and waste incineration.