China Power Pu'an Power Plant Completes Ultra-Low Emission Retrofit for 2×660 MW Supercritical Units

On March 18, 2026, China Power Pu'an Power Plant successfully completed the ultra-low emission retrofit and sulfur trioxide (SO3) removal system upgrade for its two 660 MW supercritical clean coal-fired units. After the upgrade, the plant successfully passed a 168-hour trial operation with stable performance and fully compliant parameters, setting a new benchmark for its environmental performance.

The plant adopted the dry-wet synergistic SO3 removal technology. During the retrofit, cross-functional teams spanning operation, maintenance, and equipment suppliers collaborated on technical disclosures, risk assessments, and emergency preparedness plans. During trial operation, the on-site personnel closely monitored the operating parameters, resolved issues promptly, and optimized control logic, efficiently bringing both dry and wet removal systems into stable operation. These efforts ensured safe, controllable, and efficient execution of the retrofit. Upon completion, the plant's hourly average emissions of nitrogen oxides (NOx) and sulfur dioxide (SO2) were reduced by 50%, establishing a solid foundation for the clean and efficient operation of the plant's generating fleet.

The retrofit represents the first domestic application of dry-wet synergistic SO3 removal technology, a breakthrough approach that effectively addresses persistent industry challenges including blue plume emissions and air preheater fouling, improving both the safety and environmental performance of the generating units.