控制冷凝法对烟气中三氧化硫冷凝分离效率研究

目的研究不同操作参数和烟气工况对控制冷凝法分离烟气中SO₃效率的影响,以避免因烟气中SO₃质量浓度过高导致装置腐蚀穿孔并产生高盐污水。 方法利用自主研发的烟气中SO₃控制冷凝效率评价装置研究了不同操作参数和烟气工况对烟气中SO₃冷凝分离效率的影响。 结果烟气流量和烟气中SO₃质量浓度变化对SO₃冷凝分离效率有明显影响,冷凝系统末端引入石英过滤棉可以明显地消除烟气中SO₃质量浓度变化对SO₃冷凝分离效率的影响。在烟气取样管路的温度高于酸雾露点并且冷凝管温度介于酸雾露点和水蒸气露点之间时,烟气取样管路保温温度、冷凝管温度变化对烟气中SO₃冷凝分离效率几乎没有影响。烟气中SO₂质量浓度变化对烟气中SO₃冷凝分离效率几乎没有影响。 结论建立的SO₃冷凝分离方法对烟气中SO₃的分离效率大于95%。 

Study on condensation separation efficiency of sulfur trioxide in flue gas by controlled condensation method

ObjectiveThe effects of different operating parameters and flue gas conditions on the separation efficiency of sulfur trioxide in flue gas by controlled condensation method (CCM) were studied to avoid the corrosion perforation of the device and the generation of high-salt sewage due to the high mass concentration of sulfur trioxide in flue gas. Methods The effects of different operating parameters and flue gas conditions on the condensation separation efficiency of sulfur trioxide in flue gas were studied by using the self-developed sulfur trioxide in flue gas control condensation efficiency evaluation device. ResultsThe change of flue gas flow rate and sulfur trioxide mass concentration in flue gas had a significant effect on the condensation separation efficiency of sulfur trioxide. The introduction of quartz filter cotton at the end of the condensation system could obviously eliminate the influence of sulfur trioxide mass concentration change in flue gas on the condensation separation efficiency of sulfur trioxide. When the temperature of the flue gas sampling pipeline was higher than the dew point of the acid mist and the temperature of the condensation pipe was between the dew point of the acid mist and the dew point of the water vapor, the holding temperature of the flue gas sampling pipeline and the temperature change of the condensation pipe had little effect on the condensation separation efficiency of sulfur trioxide in the flue gas. The change of sulfur dioxide mass concentration in flue gas has little effect on the condensation separation efficiency of sulfur trioxide in flue gas. ConclusionAccording to the established sulfur trioxide condensation separation method, the separation efficiency for sulfur trioxide is greater than 95%.