Method and device for treating sulfur-containing flue gas
A treatment method and flue gas technology, applied in separation methods, sulfur preparation/purification, chemical instruments and methods, etc., can solve the problems of long treatment process, high energy consumption and complicated treatment process, and achieve low treatment cost, High carbon fixation efficiency and good removal effect
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Embodiment 1
[0050] The waste lye produced by an ethylene plant in an enterprise has a COD of 58000 mg / L and a sodium sulfide concentration of 2.9wt% (S 2- : 12200mg / L), the concentration of sodium carbonate is 2.0wt% (20500mg / L), and the concentration of sodium hydroxide is 1.6wt%.
[0051] The flue gas produced by a certain enterprise mainly consists of: CO 2 content of 14v%, NOx content of 0.06v% (of which NO accounts for 90%), SO 2 The content is 0.04v%.
[0052] Pass the flue gas into the desulfurization absorption tower, use ethylene waste lye as the absorbent, circulate and absorb in the desulfurization tower, control the pH of the absorption liquid to 5-6, when the pH is lower than 5, discharge part of the desulfurization absorption liquid, Start to supplement the waste lye, when the pH reaches 6, stop the supplement to obtain desulfurization flue gas. The desulfurization absorption liquid discharged outside is mainly composed of sodium bisulfite, and slaked lime is added to reg...
Embodiment 2
[0057] The waste lye produced by an ethylene plant in an enterprise has a COD of 33000mg / L and a sodium sulfide concentration of 2.1wt% (S 2- : 8831mg / l), the concentration of sodium carbonate is 1.1wt% (11275mg / L), and the concentration of sodium hydroxide is 1.2wt%.
[0058] The flue gas produced by a certain enterprise mainly consists of: CO 2 content of 10v%, NOx content of 0.04v%, SO 2 The content is 0.03v%.
[0059] Pass the flue gas into the desulfurization absorption tower, use ethylene waste caustic liquor as the absorbent, circulate and absorb in the desulfurization tower, control the pH of the absorption liquid to 5.5-6.5, when the pH is lower than 5.5, discharge part of the desulfurization absorption liquid, Start to supplement ethylene spent lye, when the pH reaches 6.5, stop supplementing to obtain desulfurization flue gas. The desulfurization absorption liquid discharged outside is mainly composed of sodium bisulfite, and slaked lime is added to regenerate th...
Embodiment 3
[0064] The waste lye produced by propane dehydrogenation to olefins in an enterprise contains 6.83wt% sodium sulfide, 4.85wt% sodium hydrosulfide, 117300mg / L COD, and 13.5 pH.
[0065] The flue gas produced by a certain enterprise mainly consists of: CO 2 content of 20v%, NOx content of 0.05v%, SO 2 The content is 0.02v%.
[0066] Pass the flue gas into the desulfurization absorption tower, use propylene waste lye as the absorbent, circulate and absorb in the desulfurization tower, control the pH of the absorption liquid to 5-6, when the pH is lower than 5, discharge part of the desulfurization absorption liquid, Start supplementing propylene spent lye, when the pH reaches 6, stop supplementing to obtain desulfurization flue gas. The desulfurization absorption liquid discharged outside is mainly composed of sodium bisulfite, and slaked lime is added to regenerate the desulfurization waste liquid to obtain CaSO 3 The precipitate is calcined at high temperature to obtain high...
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