China Power Changshu Power Generation's Innovation Achievements Won Four-Star Award for Water Treatment Technology in the National Power Generation Industry

Recently, the evaluation results of innovation achievements in water treatment technology in the power generation industry for the year 2026 were officially announced. China Power Changshu Power Generation's innovation achievement, "Innovation and Application of a Chloride Detection Method for Working Solution in Urea-to-Ammonia Hydrolyzers", won the National Four-Star Innovation Achievement Award.

Urea hydrolysis for ammonia production is a core process in the denitrification systems of thermal power plants, and the chloride content in the working solution directly affects the corrosion risk and service life of hydrolyzers and ammonia gas pipelines. Traditional detection methods, which are significantly impacted by high concentrations of ammonium ions, have disadvantages such as noticeable data deviation and poor repeatability, making them difficult to meet the on-site demand for rapid and accurate monitoring. In response to pain points in production, China Power Changshu Power Generation innovatively adopted potentiometric titration, optimized the pretreatment process, effectively shielded against interference from high-ammonia matrices, and significantly enhanced the sensitivity of the potential jump, thereby enabling stable, accurate, and automatic endpoint determination under low-concentration chloride conditions, and completely resolving the long-standing detection challenge.

This innovation achievement has been fully applied to the urea stations of the company's 4×330 MW and 2×1000 MW units, delivering significant safety, economic, and environmental benefits: thanks to the dynamic optimization of discharge strategies based on precise data, the discharge volume has been substantially reduced; chloride ion out-of-limits can be effectively warned of to prevent stress corrosion and blockages in equipment, consequently extending the service life of critical components; and the discharge volume of high-chloride wastewater has been substantially reduced to alleviate the burden on end-of-pipe treatment systems, thereby providing reliable technical support for synergizing the reduction of pollution and carbon emissions from power plants.

It is reported that this method is suitable not only for the thermal power industry, but also for analyzing the quality of high ammonia and chlorine-containing water in industries such as chemical fertilizer industry, chemical industry and environmental protection industry. It offers significant potential for industry-wide replication and large-scale application, and provides reference and replicable experience for power generation enterprises to improve the quality and efficiency of water treatment and enhance the inherent safety of equipment.