Stabilization method for secondary release of mercury in seawater desulfurization of coal-fired power plant and application
A secondary release, coal-fired power plant technology, applied in separation methods, chemical instruments and methods, water pollutants, etc., can solve problems such as low mercury removal efficiency, large oxidant consumption, increased absorption liquid corrosion, etc., to achieve industrial application High value, reduced secondary release, and low environmental impact
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Embodiment 1
[0054] The concentration of mercury in the analog flue gas is 40 μg / m 3 SO 2 The concentration of 1000 ppm, NOx concentration is 300 ppm, and the gas flow is 1 L / min. Add NaClo and Fenton reagents in seawater, Fe 3+ With h 2 O 2 The molar ratio is 0.6, the Fenton reagent is added to H 2 O 2 The amount was 0.1 mmol / L, NaClo added amount was 3 mmol / L, sea water pH of 7.2, and the temperature was 55 ° C. Absorbing the simulated flue gas by single-layer spraying method, SO 2 The removal rate is above 70%, and the NOx removal rate is over 35%, and the removal rate of mercury is 65%. Then, 500 ml of the reaction after the reaction was taken, 5 mmol / L sodium sulfate solution was added thereto, and sodium thiosulfate solution was added thereto. 2- S 2 O 3 2- The molar ratio is 1, and the solution is stirred. The mercury content of the solid phase was 11%, and the mercury content in the liquid phase was 54%, and the escape amount of mercury in the gas phase was 35%.
Embodiment 2
[0056] The concentration of mercury in the analog flue gas is 40 μg / m 3 SO 2 The concentration of 1000 ppm, NOx concentration is 300 ppm, and the gas flow is 1 L / min. NaClo, Fenton reagent, Fe 3+ With h 2 O 2 The molar ratio is 0.8, the Fenton reagent is added to H 2 O 2 The amount was 0.1 mmol / L, NaClo added is 3 mmol / L, and the sea water is 7.5, and the temperature is 55 ° C. Absorbing the simulated flue gas by single-layer spraying method, SO 2 The removal rate is more than 70%, and the NOx removal rate is over 35%, and the removal rate of mercury is 70%. Then, 500 ml of the reaction after the reaction was taken, 6 mmol / L sodium sulfate solution was added thereto, and sodium thiosulfate solution was added thereto. 2- S 2 O 3 2- The molar ratio is 1, and the solution is stirred. The mercury content of the solid phase was 21%, and the mercury content in the liquid phase was 53%, and the escape amount of mercury in the gas phase was 26%.
Embodiment 3
[0058] The concentration of mercury in the analog flue gas is 40 μg / m 3 SO 2 The concentration of 1000 ppm, NOx concentration is 300 ppm, and the gas flow is 1 L / min. NaClo, Fenton reagent, Fe 3+ With h 2 O 2 The molar ratio is 1, the Fenton reagent is added to H 2 O 2 The amount was 0.1 mmol / L, NaClo added amount was 2 mmol / L, sea water pH of 7.5, and the temperature was 60 ° C. Absorbing the simulated flue gas by single-layer spraying method, SO 2 The removal rate is more than 70%, and the NOx removal rate is over 35%, and the removal rate of mercury is 71%. Then, 500 ml of the reaction after the reaction was taken, 6 mmol / L sodium sulfate solution was added thereto, and sodium thiosulfate solution was added thereto. 2- S 2 O 3 2- The molar ratio is 1, and the solution is stirred. The mercury content of the solid phase was 15%, and the mercury content in the liquid phase was 47%, and the escape amount of mercury in the gas phase was 33%.
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