Adjusting and control method for elemental sulfur byproduct of sulfate in desulfurization and denitrification absorption liquid of flue gas
A technology for desulfurization, denitrification, and liquid absorption, applied in the field of flue gas purification, can solve secondary pollution and other problems, achieve the effect of avoiding secondary pollution and obtaining economic benefits
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Embodiment 1
[0033] A control method for the by-production of elemental sulfur from sulfate in the flue gas desulfurization and denitrification absorption liquid;
[0034] A 75t / h coal-fired thermoelectric boiler with a flue gas flow rate of 100,000 Nm 3 / h,SO 2 The content is 1000mg / Nm 3 , NO content is 300mg / Nm 3 , by washing with an alkaline solution containing Fe(II)EDTA, the desulfurization efficiency and denitrification efficiency are calculated according to 90%, SO 2 The conversion to sulfate is 1406.25mol / h, the production of Fe(II)EDTA-NO is 900mol / h, and the volume of absorption liquid used for purifying flue gas is 800m 3 After the absorption liquid purifies the flue gas for 10 hours, the molar concentration of sulfate in the absorption liquid is 17.58mM, and the molar concentration of Fe(II)EDTA-NO is 11.25mM. Since part of Fe(II)EDTA is oxidized by oxygen in the flue gas, the absorption liquid The molar concentration of Fe (III) EDTA in the iron is 7.5mM (accounting for 40...
Embodiment 2
[0040] A 220t / h coal-fired thermoelectric boiler with a flue gas flow rate of 250,000 Nm 3 / h, SO 2 The content is 1500mg / Nm 3 , NO content is 500mg / Nm 3 , by washing with an alkaline solution containing Fe(II)EDTA, the desulfurization efficiency and denitrification efficiency are calculated according to 95%, SO 2 The conversion to sulfate is 5566.40mol / h, the production of Fe(II)EDTA-NO is 3958.33mol / h, and the volume of absorption liquid used for purifying flue gas is 1800m 3 After the absorption liquid purifies the flue gas for 8 hours, the molar concentration of sulfate in the absorption liquid is 24.74mM, and the molar concentration of Fe(II)EDTA-NO is 17.59mM. Since part of Fe(II)EDTA is oxidized by oxygen in the flue gas, the absorption liquid The molar concentration of Fe (III) EDTA in the iron is 11.73mM (accounting for 40% of the total iron concentration in the absorption solution). will be 1800m 3 The absorption liquid is all discharged into the moving bed biof...
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