Optimization of the Integrated Device for Desulfurization and Dust Removal of Dry-process Pipeline Spraying Sodium Bicarbonate

Based on the dry pipe spraying technology and the bag dust removal technology, the experimental exploration of the integrated desulfurization and dust removal was carried out. The integrated desulfurization and dust removal device with the bag dust collector as the main body was optimized by adding a Venturi tube. The influences of temperature, sodium-sulfur ratio, inlet SO₂ mass concentration, NaHCO₃ particle size and dust mass concentration on the performance of the optimized desulfurization and dust removal device were explored. Results show that the addition of Venturi helps to promote the desulfurization reaction. With the increase of the wind speed at the throat, the desulfurization efficiency also continues to increase, and the dust removal efficiency of the bag filter is always kept above 99%. When the temperature rises from 130 ℃ to 200 ℃, the desulfurization efficiency increases first and then decreases, and finally maintains a stable trend with the increase of temperature. After adding 1 000 mg/m³ mass concentration of dust, when the wind speed at the Venturi throat is 86 m/s, the optimal desulfurization efficiency is about 97%; when the wind speed at the venturi throat is 40 m/s, the optimal desulfurization efficiency is 94%, indicating that the presence of a certain concentration of dust helps to improve the desulfurization efficiency. The small particle size NaHCO₃ particles contribute to the desulfurization reaction. The addition of the Venturi further promotes the reaction of NaHCO₃ and SO₂ in the spray section of the pipeline. When the sodium-sulfur ratio is less than 1.6, the desulfurization efficiency continues to increase as the sodium-sulfur ratio increases. When the sodium-sulfur ratio is greater than 1.6, the desulfurization efficiency remains basically stable. The inlet SO₂ mass concentration has little effect on the desulfurization efficiency of the device.