1. Zhenjiang's Power Industry and Condenser Cleaning Needs
Zhenjiang, located at the confluence of the Yangtze River and the Grand Canal, is a key power generation center in southern Jiangsu. The Jianbi Power Station, operated by China Guodian Corporation, has a total installed capacity exceeding 4,000 MW, supplying electricity to the entire Sunan region. Condensers, as the core heat exchange equipment in thermal power units, directly determine unit vacuum levels and coal consumption rates.
Cooling water for Zhenjiang power plants is drawn from the Yangtze River, which has moderate to high hardness (CaCO₃ concentration 80-120 mg/L) and significant seasonal sediment fluctuations. During summer flood season, sediment content can reach 500-800 mg/L, depositing silicate and carbonate scale inside condenser tubes. Long-term operation leads to progressive fouling: heat transfer coefficients drop 30-50%, condenser vacuum decreases 2-5 kPa, and coal consumption increases 3-8 g/kWh. For a 300 MW unit, this translates to thousands of tons of additional coal and millions in economic losses annually.
2. Yangtze River Water Quality Impact on Condenser Fouling
The Zhenjiang section of the Yangtze River has an annual average sediment content of approximately 300 mg/L. During summer flood season (June-September), sediment spikes to over 800 mg/L, with significantly elevated silicate and carbonate concentrations. In winter, sediment drops to 50-100 mg/L but water temperatures fall to 5-8°C, creating larger temperature differentials that accelerate CaCO₃ precipitation. This seasonal water quality variation produces distinct fouling layers: an outer silt/biofilm layer, a middle CaCO₃ hard scale layer, and an inner tightly-adherent silicate layer.
Additionally, dissolved oxygen levels in the Yangtze remain at 6-8 mg/L year-round. Combined with organic acids from microbial metabolism, copper tube and carbon steel tube sheets face ongoing under-deposit corrosion risks. While stainless steel and titanium tubes resist uniform corrosion, crevice corrosion and pitting can still occur beneath sediment deposits. For Zhenjiang power plants, condenser cleaning is therefore not just about restoring heat transfer efficiency — it is a critical equipment protection measure.
3. Fouling Types and Impact
| Scale Type | Cause | Impact |
|---|---|---|
| Calcium Carbonate (CaCO₃) | Ca²⁺/Mg²⁺ precipitation under heat | Thermal conductivity only 0.5-2 W/(m·K), severely degrades heat transfer |
| Silicate Scale | SiO₂ deposition from Yangtze sediment | Hard and dense, resistant to conventional acid cleaning |
| Biofilm / Slime | Algae and bacteria proliferation | Accelerates under-deposit corrosion, pitting risk |
| Corrosion Products | CuO, Fe₂O₃ metal oxides | Tube wall thinning, potential leakage and shutdown |
4. Chemical Cleaning Formulations (by Tube Material)
| Tube Material | Primary Cleaning Agent | Corrosion Inhibitor System | Control Parameters |
|---|---|---|---|
| Titanium (TA1/TA2) | Sulfamic Acid 4-6% | BTA 0.1% + Sodium Molybdate 0.05% | Temp 40-55°C, pH 2.5-3.5 |
| Stainless Steel (304/316L) | Sulfamic Acid 5-8% + Citric Acid 1-2% | BTA 0.15% + Urotropine 0.1% | Temp 45-60°C, pH 2.0-3.0 |
| Copper (HSn70-1/BFe30) | Sulfamic Acid 3-5% | BTA 0.2% + MBT 0.05% | Temp 35-50°C, pH 3.0-4.0 |
5. Service Coverage and Response
Lanxing Qingxi is headquartered in Danyang, approximately 30 km from downtown Zhenjiang (40-minute drive). We serve all Zhenjiang districts: Jingkou, Runzhou, Dantu, Zhenjiang New District, Danyang, Yangzhong, and Jurong.
- 2-hour emergency response: On-site inspection within 2 hours of service call
- 24/7 continuous operation: Three-shift capability during tight plant outage windows
- Free equipment survey and scale analysis: Including borescope inspection, XRF deposit analysis, and tube wall thickness measurement
- Post-cleaning performance evaluation: Vacuum comparison testing, terminal temperature difference measurement, and corrosion coupon rate calculation with full report
6. Local Case Study
Project: 300 MW unit condenser chemical cleaning at a Zhenjiang power generation enterprise
Equipment: Two-pass surface condenser, TA2 titanium tubes, 18,000 m² cooling area, 36,000 t/h circulating water flow. After 18 months of continuous operation, condenser vacuum had dropped from design value of -95 kPa to -91 kPa, with terminal temperature difference rising from 4°C to 9°C.
Cleaning approach: Sulfamic Acid + BTA circulating chemical cleaning, processing sides A and B sequentially. Pre-cleaning high-pressure water jetting (650 bar rotary nozzle) cleared tube inlet blockages. Circulation phase controlled at 48±2°C, pH 2.8-3.2, with pump flow of 180 m³/h ensuring tube velocity ≥0.8 m/s. Ca²⁺ concentration and free acid monitored every 30 minutes to determine endpoint.
Results: Post-cleaning vacuum recovered to -94.5 kPa, terminal temperature difference reduced to 4.5°C, scale removal rate ≥97%, corrosion coupon rate 0.6 g/(m²·h). Unit coal consumption decreased by 4.2 g/kWh, saving approximately 3,000 tons of standard coal annually.
7. Why Choose Lanxing Qingxi
- Local rapid response: Headquartered in Danyang, 45 minutes to Jianbi Power Station, 30-60 minutes to all Zhenjiang industrial zones
- 25 years of experience: 500+ industrial clients served, 200+ condenser cleaning projects completed
- China Industrial Cleaning Association member: All processes comply with GB/T 25146-2010 acceptance standards
- Full tube material coverage: Proven formulations for titanium, stainless steel, copper, and duplex steel condensers
- Environmental compliance: Neutralized, flocculated wastewater treatment with complete documentation and hazardous waste transfer records
Zhenjiang Power Plant Condenser Cleaning · Free Consultation
Chemical Descaling | High-Pressure Water Jetting | Tube Cleaning | Vacuum Recovery
📞 +86 18952832843
Danyang Lanxing Anticorrosion Cleaning Co., Ltd. ·
China Industrial Cleaning Association Member ·
China Boiler & Boiler Water Treatment Association Member
Address: 98 Hongjiadai, Picheng, Danbei Town, Danyang · Email: luohuiyong@126.com
Service coverage: Jiangsu (Nanjing, Suzhou, Wuxi, Changzhou, Zhenjiang, Yangzhou) · Zhejiang (Hangzhou, Ningbo) · Shanghai · Anhui (Hefei) · Shandong · Henan
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