Cov yam ntxwv ntawm FGD Cov dej khib nyiab:
1. Kev sib xyaw ua ke
Muaj cov hlau hnyav (piv txwv li, Hg²⁺, Pb²⁺) thiab siab ntau ntawm Cl⁻ (10,000–20,000 mg/L) thiab F⁻ (50–200 mg/L).
2. High Corrosivity
Tsawg pH (4-6) thiab cov ntsiab lus chloride siab ceev hlau corrosion (corrosion tus nqi: 1.5-3.0 mm / a).
3. Scaling Risk
Scaling tshuaj (piv txwv li, CaSO₄·2H₂O, CaCO₃) ntau dua 3% hauv cov concentration.
Txoj kev kho mob
Method 1: Pas dej nag
Txheej txheem Flow:
FGD cov dej khib nyiab → Cov dej khib nyiab → Cov twj tso kua mis → pH neutralization tank (cov kua qaub ntxiv) → Cov tshuaj tiv thaiv tank (coagulant / flocculant) → Clarifier → Effluent tank → Discharge
Qhov System Cheebtsam:
- Chav kho dej khib nyiab (neutralization, sedimentation, flocculation)
- Tshuaj tua kab mob (alkali, organic sulfur, coagulants)
- Sludge kho chav tsev (dewatering, pov tseg)
Cov yam ntxwv tseem ceeb:
- Tshem tawm cov khib nyiab (SS), cov hlau hnyav (Cu²⁺, Hg²⁺), thiab fluorides.
- Ua raws li cov qauv tso tawm los ntawm ntau- theem nag lossis daus.
Txoj Kev 2: Txoj Kev "Tshuaj Softening + Membrane Concentration" txheej txheem
Txheej txheem Flow:
FGD wastewater → Presedimentation tank (60% SS removal) → pH adjustment tank (Ca(OH)₂, pH 9–9.5) → Reaction tank (organic sulfur + coagulant) → Tubular microfiltration (TMF) membrane (>95% SS removal) → Clear water tank (pH adjusted to 6–9) → DTRO membrane (>95% Cl⁻ tsis lees paub) → Rov siv dua / tso tawm
Qhov zoo:
- Hloov cov lus qhia ib txwm muaj nrog kev pom zoo ntawm daim nyias nyias kom ua tau zoo dua.
- Achieves >75% dej rov qab, ua kom xoom kua tawm (ZLD) muaj peev xwm.
Ntsiab Innovation:
Lub hybrid "tshuaj softening + membrane concentration" thev naus laus zis tau txhim kho kev kho kom zoo thiab rov siv cov dej, daws cov teeb meem xws li scaling thiab chloride corrosion hauv FGD cov dej khib nyiab.