I. Introduction
The flue gas produced in miniature boiler or industrial kiln is directly fed into the absorption tower by theinduced draft fan. Several layers of high-pressure water mist combined spray heads are placed in the tower. The spray head can spray out the high-pressure water mist containing desulphurizing agent. The SO2 and dust of the flue gas fully contact and react with the absorption solution and then fall on the tower bottom and flow into the ash water circulating system. The absorption solution, after absorbing the above substances, is regenerated with regenerating agent. The slurry precipitated is pumped into the slurry treatment system with slurry pump for concentration and filtering. For the obtained wet slurry with recovery value (such as for non-ferrous smelting), directly convey it to the furnace room for smelting. The wet slurry obtained without recovery value can be used as building accessories to be sold and conveyed outwards. While the filter liquor and precipitated supernatant liquor, after PH adjustment and water supplementation, is for cyclic utilization by the high pressure water mist pump to form closed circulation of ash water, which will not only avoid secondary pollution, but also reduce alkali consumption and operation cost. The flue gas after desulphurization and dust collection and reaching emission standard provision will be discharged into the air from the chimney after its mist removed with high efficient mechanical mist eliminator.
The process flow is applicable for the desulphurization and dust collection technological transformation for miniature boiler(coal-fired or oil-fired boiler and industrial kiln) in the industries of iron and steel, non-ferrous smelting, chemicals, pharmaceuticals and papermaking.
II. Process Technical Indexes
1. Dust Collection Efficiency（Dust Reduction Rate）:≧98%
2. Desulphurization Efficiency（SO2 Reduction Rate）:≧95%
3. Dust Emission Concentration:﹤100 mg/Nm3
4. SO2 Emission Concentration:﹤100 mg/Nm3
5. Ringelmann Black Degree:﹤Class 1
