The OFEC Spray Tower operates on the principle of gas‑liquid mass transfer and chemical reaction. Exhaust gas enters the tower tangentially through the bottom inlet and, under negative pressure from the induced‑draft fan, rapidly fills the inlet section. It then passes through a flow‑equalisation zone before rising uniformly to the first‑stage packing absorption section.
On the packing surface, pollutants in the exhaust gas (such as dust, ammonia, hydrogen sulphide, etc.) come into full contact with the absorption liquid flowing downward. Dust particles are wetted and captured by liquid droplets, while acid or alkaline gases undergo neutralisation reactions with chemical agents in the absorption liquid (e.g., NaOH, H₂SO₄), forming soluble salts that flow with the liquid into the circulation tank at the bottom.
Partially treated gas continues rising to the spray section. Here, the absorption liquid is atomised through specially designed nozzles into a large number of fine droplets, creating a dense spray zone that further increases gas‑liquid contact area and enhances mass transfer efficiency. Simultaneously, the spray liquid cools the exhaust gas and reduces its discharge temperature.
The uppermost section of the tower is equipped with a mist eliminator (baffle plates or mesh demister) to separate entrained liquid droplets from the gas stream, preventing “carryover” of liquid. After multi‑stage purification, the clean gas is finally discharged to the atmosphere from the top of the tower.
The entire circulation process is driven by a recirculation pump. The absorption liquid can be reused and is periodically replenished or replaced in the circulation tank to maintain stable absorption performance.