Spray tower waste gas treatment technology is a commonly used industrial waste gas purification technology, especially suitable for treating waste gas containing acidic, alkaline, organic solvent or other water-soluble pollutants. The working principle of spray tower is to use liquid (usually water or chemical absorption liquid) to physically absorb and chemically react with pollutants in exhaust gas, thus achieving the purpose of purifying exhaust gas.
Spray tower waste gas treatment process flow
Exhaust gas introduction: The acidic or alkaline exhaust gas is introduced into the purification tower through the air duct.
Gas distribution: After the exhaust gas enters the tower, it is evenly distributed through the gas distribution device to ensure full contact with the liquid.
Gas-liquid contact: The exhaust gas passes through the packing layer or swirl plate and comes into gas-liquid contact with the absorption liquid (such as sodium hydroxide solution) sprayed down from the top, and the pollutants are absorbed by the liquid or chemically react with it.
Absorption and neutralization: On the surface of the filler, the gas and liquid phases are in sufficient contact, and contaminants are absorbed or neutralized, for example, acidic exhaust gas reacts with alkaline absorption liquid to form salt and water.
Demisting and dehydrating: The purified exhaust gas passes through the defogger plate or defogger to remove the carried droplets and reduce the moisture content.
Gas emissions: The treated clean gas is discharged into the atmosphere by the fan, reaching the emission standard.
Liquid circulation: The absorption liquid is pumped to the top of the tower by the water pump at the bottom of the tower, and then sprayed downward for recycling. Part of the liquid needs to be replaced or regenerated regularly.
Application Scenario
Paint Factory: Used to treat organic solvent exhaust gas generated during paint production or spraying.
Chemical industry: Treating acid and alkali waste gas, organic waste gas, and the like.
Pharmaceutical industry: Treatment of harmful gases generated during production.
Electronics industry: treating acidic exhaust gas generated in etching, cleaning and the like.
Process characteristics
Flexibility: The spray tower can adjust the type and concentration of absorbent liquid according to different exhaust gas composition and concentration.
Economy: Compared to other advanced treatment technologies, spray towers have lower construction and operation costs.
Easy maintenance: The spray tower has a simple structure and is easy to maintain and overhaul.
Considerations
Liquid selection: The selection of absorption liquid should be based on the waste gas composition to ensure effective chemical reaction and absorption efficiency.
Regular maintenance: The filler layer needs to be checked and cleaned regularly to prevent clogging.
Liquid handling: The liquid that has absorbed pollutants needs to be further treated or disposed of to avoid secondary pollution.
Spray tower exhaust gas treatment technology is a mature technology, widely used in various industrial fields, and plays an important role in controlling air pollution.