氨法脱硫中亚硫酸铵的氧化工艺参数

通过改变亚硫酸铵初始浓度、硫酸铵初始浓度、反应温度、混合液pH值、空气流量、催化剂浓度, 研究氨法脱硫中亚硫酸铵氧化率的变化. 结果表明: (NH₄)₂SO₃的浓度与 (NH₄)₂SO₃的氧化率成反比关系; 初始 (NH₄)₂SO₄浓度越大, (NH₄)₂SO₃氧化率越低; 当反应温度为40~60 ℃时, 随着温度的升高,  (NH₄)₂SO₃的氧化率不断增大;  (NH₄)₂SO₃氧化率受混合溶液pH值的影响, 较合适的pH值为5.5; 当空气流量为100~400 L/h时, 随着空气流量的增大,  (NH₄)₂SO₃的氧化率增大; 随着催化剂CoSO₄浓度升高,  (NH₄)₂SO₃氧化率增大.结合氨法脱硫工程实例考虑, 当反应温度控制在50 ℃ 左右, (NH₄)₂SO₃采用低浓度氧化, 混合液pH值为5.5, 空气流量为300 L/h, 催化剂浓度较高时, (NH₄)₂SO₃的氧化率较高.

Process parameters of ammonium sulfite oxidation in ammonia desulfurization technology

The influence of affecting factors on the oxidation rate of (NH₄)₂SO₃ including concentration of (NH₄)₂SO₃, concentration of (NH₄)₂SO₄, temperature, pH value, air flow rate and concentration of CoSO₄ were studied. The results showed that the oxidation rate of (NH₄)₂SO₃is lowered with the increase of initial concentration of (NH₄)₂SO_3. It is the same as concentration of (NH₄)₂SO₄. From 40 ℃ to 60 ℃, (NH₄)₂SO₃ oxidation rate increases with the increase of reaction temperature. The (NH₄)₂SO₃ oxidation rate is also influenced by the pH value of the mixed solution, with the most preferred value being 5.5. When the air flow rate is within 100~400 L/h and with increase of air flow, (NH₄)₂SO₃ oxidation rate increases. Taking into account the ammonia desulfurization project, the most appropriate process parameters are: reaction temperature at about 50 ℃, (NH₄)₂SO₃ at low concentration, the pH value of mixed solution at 5.5, air flow rate at 300 L/h and CoSO₄ at high concentration.