The spray tower is the simplest equipment used for industrial dust removal or waste gas treatment. It has a simple structure, low cost, small gas pressure drop, and will not clog.

The working principle of the spray tower can be divided into three forms: downstream, countercurrent and crosscurrent. The most commonly used one is the countercurrent spray: the acidic or alkaline acid mist exhaust gas is introduced into the purification tower through the air duct, passes through the packing layer, and the exhaust gas is sent into the tower from the bottom. After being distributed by the gas distribution device, it continuously passes through the gaps of the packing layer in the countercurrent with the sodium hydroxide absorption liquid. On the surface of the packing, the gas and liquid phases fully contact and absorb the neutralization reaction to absorb the acidic or alkaline pollutants contained in the exhaust gas.After the acid mist exhaust gas is purified, it is dehydrated and defogged by the defogger plate, and the clean gas is discharged into the atmosphere from the fan. Insoluble viscose particles and dust are discharged into the collection tank, suspended particles are discharged from the overflow port, and the collected sediment is discharged from the sewage outlet. The absorption liquid is pressurized by the water pump at the bottom of the tower and sprayed down at the top of the tower, and finally flows back to the bottom of the tower for recycling.

2.Advantages of spray pretreatment equipment:

The scrubber has low noise, stable operation, simple and convenient operation; the water-washing exhaust gas treatment system is cheap and simple to treat; it can treat gaseous, liquid and solid pollution sources; the system has low pressure loss and is suitable for large air volume; it can adopt a multi-stage filling layer design to treat mixed pollution sources. It can economically and effectively treat acid and alkaline exhaust gases, with a removal rate of more than 99%.

3. Working principle of spray pretreatment equipment:

Dust-containing gas and black smoke exhaust enter the bottom cone bucket of the exhaust gas purification tower through the smoke pipe, and the smoke is washed by a water bath. After the black smoke, dust and other pollutants are washed by water, some dust particles move with the gas, and are combined with the impact water mist and the circulating spray water, and further fully mixed in the main body. At this time, the dust particles in the dust-containing gas are captured by water, and the dust and water are separated by centrifugation or filtration, and flow into the circulation pool through the tower wall due to gravity, and the purified gas is discharged. The sediment in the circulation pool of wastewater is regularly cleared and transported out.

4. Applicable industries of spray pretreatment equipment:

Electronics industry, semiconductor manufacturing, PCB manufacturing, LCD manufacturing, steel and metal industry, electroplating and metal surface treatment industry/pickling/process/dye/pharmaceutical/chemical/industry,deodorization/chlorine neutralization, removal of combustion exhaust SOx/NOx, and treatment of other water-soluble air pollutants.