In thermal power plants, water treatment is conducted to prevent problems such as corrosion
in the boiler/turbine systems, scale formation/deposition, and carryover to the turbine. Most plants
have been in operation without incident, with the water quality criteria that were established based
on reference standards such as the Japanese Industrial Standards (JIS).1 To enable the early
detection of signs that indicate the possible occurrence of a serious incident in the future, we have
developed the "water quality diagnostic system." The execution of "appropriate water quality
control" is considered important not only for decreased amounts of chemicals in use and
wastewater to lower the environmental impact, but also from an economical point of view (such as
shortening of plant startup time and operational cost reduction).
