Mercury removal process based on lime-gypsum method desulphurization system and mercury removal absorption liquid
A desulfurization system and mercury absorption technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems of mercury reduction not being effectively suppressed, increased absorption liquid corrosion, and failure to achieve stabilization, etc. High removal rate, suppression of mercury reduction, and high mercury removal effect
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Embodiment 1
[0046] Example 1: Ammonium persulfate oxidation combined with calcium hydroxide absorption to remove mercury
[0047] The flue gas mercury removal absorption liquid used in this embodiment includes calcium hydroxide slurry with a mass concentration of 2%. Ammonium persulfate is added to the calcium hydroxide slurry in an amount of 5 mmol / L. Under simulated flue gas conditions , the mercury inlet concentration is 80μg / L, the sulfur dioxide concentration is 1500ppm, and the nitrogen oxide concentration is 300ppm. Through single-layer spraying, the removal efficiency of sulfur dioxide is above 60%, the removal efficiency of nitrogen oxide is above 20%, and the removal efficiency of mercury reaches 50%.
Embodiment 2
[0048] Example 2: Ammonium persulfate oxidation combined with calcium sulfite absorption to remove mercury
[0049] The flue gas mercury removal absorption liquid used in this embodiment includes calcium sulfite slurry with a mass concentration of 5%. Ammonium persulfate is added to the calcium sulfite slurry in an amount of 8mmol / L. Under simulated flue gas conditions , the mercury inlet concentration is 80μg / L, the sulfur dioxide concentration is 1500ppm, and the nitrogen oxide concentration is 300ppm. Through single-layer spraying, the removal efficiency of sulfur dioxide is above 60%, the removal efficiency of nitrogen oxide is above 20%, and the removal efficiency of mercury reaches 53%.
Embodiment 3
[0050] Example 3: Sodium persulfate and ammonium sulfate oxidation combined with calcium hydroxide absorption to remove mercury
[0051] The flue gas mercury removal absorbing liquid used in this embodiment comprises calcium hydroxide slurry with a mass concentration of 2%, sodium persulfate and ammonium sulfate are added to the calcium hydroxide slurry, and its addition is sodium persulfate 5mmol / L, Ammonium sulfate is 8mmol / L. Under simulated flue gas conditions, the mercury inlet concentration is 80μg / L, the sulfur dioxide concentration is 1500ppm, and the nitrogen oxide concentration is 300ppm. The oxide removal efficiency is above 30%, and the mercury removal efficiency reaches 55%.
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