不同碱基物质对燃煤烟气脱氯的影响

实验探究NaOH、Na₂CO₃、NaHCO₃这三种常见的碱基物质在模拟燃煤烟气中的实际表现,发现三种碱基物质均具有一定的脱氯性能,NaOH、Na₂CO₃、NaHCO₃的脱氯性能依次下降,以脱氯效率70%为目标,使用三种碱基物质Na/Cl比分别需要达到5.8、7.1、8.7。高浓度SO₂的存在对烟气脱氯有竞争作用,随着SO₂浓度的提高,脱氯效率线性下降,不同碱基物质下,SO₂浓度对脱氯效率的影响规律基本一致,SO₂浓度每增加100 mg/m³,脱氯效率下降约1.4%。由于三种碱基物质达到相同脱氯效率时的Na/Cl比不同,综合考虑成本和溶解性,NaOH最具工业应用价值。

Effects of different alkali-based materials on coal-fired flue gas dechlorination

Three common alkali-based materials, NaOH, Na₂CO₃ and NaHCO₃, were utilized to explore their dechlorination performance in a simulated coal-fired flue gas. The results show that the dechlorination efficiency increases along with the enhancement of alkaline intensity. As the Na/Cl molar ratio reaches 5.8, 7.1 and 8.7, respectively, the dechlorination efficiency of all the three alkalis (NaOH, Na₂CO₃ or NaHCO₃) exceeds 70%. The SO₂ of high concentration in flue gas has competitive effects on dechlorination. With the increase in SO₂ concentration, the dechlorination efficiency drops linearly. The influence of SO₂ concentration on the dechlorination efficiency is almost identical regardless of different alkali-based materials. For per 100 mg/m³ augment in SO₂ concentration, the dechlorination efficiency decreases by about 1.4%. NaOH is determined to be the most valuable alkali-based material for industrial application considering the cost and solubility.