Method and system for simultaneous desulfurization, denitrification and demercury removal of magnetically separable catalysts excited by ozone combined with microwave
A technology for desulfurization, denitrification, mercury removal, and magnetic separation is applied in the field of flue gas purification, which can solve the problems of hindering the transmission of ultraviolet light, difficult to enlarge the reaction device, and restricting the industrial application of the photochemical removal system.
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Embodiment 1
[0101] Example 1. SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 300ppm and 50μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 80ppm, the molar concentration of potassium hydrogen persulfate compound salt is 0.3mol / L, the pH of the solution is 3.8, the catalyst CoFe 2 o 4 The dosage is 0.3kg per cubic meter, and the microwave radiation power density is 300W / m 3 , the liquid-gas ratio is 3L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO and Hg 0 The simultaneous removal efficiencies can reach 82.2%, 55.2% and 83.1%, respectively.
Embodiment 2
[0102] Example 2. SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 300ppm and 50μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 120ppm, the molar concentration of potassium hydrogen persulfate compound salt is 0.6mol / L, the pH of the solution is 3.8, the catalyst CoFe 2 o 4 The dosage is 0.4kg per cubic meter, and the microwave radiation power density is 600W / m 3 , the liquid-gas ratio is 3L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO and Hg 0 The simultaneous removal efficiencies can reach 89.2%, 65.2% and 95.1%, respectively.
Embodiment 3
[0103] Example 3. SO in flue gas 2 ﹑NO and Hg 0 Concentrations are 2000ppm, 300ppm and 50μg / m 3 , the flue gas temperature is 40°C, the ozone concentration is 160ppm, the molar concentration of potassium hydrogen persulfate compound salt is 1.0mol / L, the pH of the solution is 3.8, the catalyst CoFe 2 o 4 The dosage is 0.6kg per cubic meter, and the microwave radiation power density is 800W / m 3 , the liquid-gas ratio is 3L / m 3 . The results of the small test are: SO in flue gas 2 ﹑NO and Hg 0 The simultaneous removal efficiencies can reach 100%, 92.2% and 100%, respectively.
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