In our self-powered power plant, the steam-water sampling points are distributed across various locations. The cooling water for the cooling units typically uses industrial water, which, due to its high Ca2+ and Mg2+ content, tends to form CaCO3 and MgCO3 precipitates upon absorption of heat. This leads to scaling in the cooling units and their associated cooling water pipes, affecting cooling efficiency and preventing the collection of representative steam-water samples. Additionally, scaling necessitates the timely removal of scale by maintenance personnel, increasing their workload and rendering it impossible to monitor the quality of the steam-water during scale removal. In severe cases, the cooling units may require replacement, further increasing maintenance costs. Moreover, the direct discharge of the cooled water after absorption results in water resource waste and loss of thermal energy from the power plant, while also increasing the plant's wastewater discharge, impacting environmental protection and the economic benefits of the power plant. To summarize, our plant is equipped with 4 UG-75/3.82-M42 type circulating fluidized bed boilers paired with 3 N15-3.43/2 steam turbine units, which were commissioned in 2004 and underwent a technical upgrade in 2005. The steam-water sampling points were converted from decentralized to centralized sampling, and the cooling water for the steam-water sampling cooling units was switched from industrial water to demineralized water. After over a year of operation, the economic benefits have proven to be very significant.