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Views: 3 Author: XICHEN EP LTD Publish Time: 2025-07-19 Origin: XICHEN EP LTD
Advanced Solutions for Clean Energy Generation
Waste-to-Energy (WTE) plants convert municipal solid waste (MSW) into electricity/heat but produce toxic flue gases (HCl, SO₂, NOx, dioxins, heavy metals). Effective flue gas treatment is critical to meet environmental regulations (EU IED, US EPA, China GB 18485). Below are key technologies and processes used globally.
| Pollutant | Concentration Range | Source | Health/Environmental Risk |
|---|---|---|---|
| Dust/Particulates | 1,000–5,000 mg/Nm³ | Incomplete combustion | Respiratory diseases |
| HCl | 200–1,000 mg/Nm³ | PVC, plastics | Corrosion, acid rain |
| SO₂ | 50–500 mg/Nm³ | Rubber, textiles | Acid rain, lung damage |
| NOx | 100–400 mg/Nm³ | High-temperature combustion | Smog, ozone depletion |
| Dioxins/Furans | 0.1–10 ng TEQ/Nm³ | Chlorinated waste | Carcinogenic, bioaccumulative |
| Hg/Cd/Pb | 0.01–5 mg/Nm³ | Batteries, electronics | Neurotoxicity, soil contamination |
Electrostatic Precipitator (ESP)
Removes 99% of fly ash (efficiency: <10 mg/Nm³).
Operating Temp: 200–300°C (before quenching).
Fabric Filter (Baghouse)
Used with activated carbon injection for dioxin/heavy metal adsorption.
Material: PTFE-coated fiberglass (resists acid gases).
| Technology | Reagents | Efficiency | Pros & Cons |
|---|---|---|---|
| Wet Scrubber | NaOH/Ca(OH)₂ slurry | HCl: >99% | ✅ High efficiency ❌ Wastewater |
| Semi-Dry Scrubber | Lime slurry + spray drying | SO₂: 90% | ✅ No wastewater ❌ Higher reagent use |
| Dry Scrubbing | NaHCO₃ powder | HCl/SO₂: 85% | ✅ Compact design ❌ Frequent replacement |
Selective Catalytic Reduction (SCR)
Uses NH₃/urea + catalyst (V₂O₅-WO₃/TiO₂) at 180–400°C.
Efficiency: >90% NOx removal.
Selective Non-Catalytic Reduction (SNCR)
Injects ammonia at 900–1,100°C (less efficient: 30–70%).
Activated Carbon Injection (ACI)
Powdered AC adsorbs dioxins (99%) + Hg (90%).
Dosage: 50–200 mg/Nm³.
Catalytic Filters (DeNOx + DeDioxin)
Combined SCR + dioxin destruction (e.g., Haldor Topsoe’s SNOX).
Wet ESP or HEPA Filter for sub-micron particles.
Continuous Emission Monitoring (CEMS) for real-time compliance.
| Region | Standard | Emission Limits (mg/Nm³) |
|---|---|---|
| EU | IED (2010/75/EU) | HCl: 10, SO₂: 50, NOx: 200, Dust: 10 |
| USA | EPA MACT | HCl: 25, SO₂: 30, NOx: 150, Hg: 0.005 |
| China | GB 18485-2014 | HCl: 60, SO₂: 100, NOx: 300, Dioxins: 0.1 ng TEQ |
Plasma-Assisted Catalysis (Break down dioxins at low temps).
AI-Optimized Reagent Dosing (Reduces chemical consumption by 20%).
Carbon Capture (Amine scrubbing for CO₂ from WTE flue gas).
Modern WTE plants integrate multi-stage flue gas treatment to achieve near-zero emissions. Wet scrubbing + SCR + ACI is the gold standard, while semi-dry systems dominate in space-constrained areas. Future trends focus on energy recovery and AI-driven optimization.
| | N0.34 Zhenxing Road (Shengtaian Heavy Industrial Park B), Loucun, Guangming New Dist, Shenzhen, Guangdong, China |
| | +86 18028775826 |
| | Leyte@china-xicheng.com |