Power Plant Instrumentation And Analyzers

One way to control the steam production process and also maintain the proper functioning of each component in the steam cycle in power plants is to use accurate and efficient analysis equipment in the sampling system of a steam power plant or combined cycle. Monitoring some parameters is very crucial in controlling the steam cycle, and given the characteristics of water in this process (water must be ultrapure in a major part of the process), measuring its quality requires tools and equipment with special characteristics. Parameters such as pH, specific electrical conductivity, cationic electrical conductivity, dissolved oxygen, sodium, and silica are among these vital parameters. The main purpose of implementing a chemical regime in a power plant is to maintain the performance of all components of the steam cycle in the best conditions. Therefore, it is possible to prevent corrosion, deposits and serious damage to equipment such as turbines, tube boilers, ultrapure water production units, etc. As can be seen in the figure above, the monitoring parameters in each part of a power plant are different from the other. Measuring pH in a power plant Given the ultrapure nature of the water in the steam cycle, appropriate equipment must be used to measure pH, which allows measurement in environments with very low electrical conductivity with very high accuracy. The following sensors are among the most efficient and suitable sensors for measuring pH in a power plant. Measuring specific and cationic electrical conductivity in a power plant Given that the electrical conductivity range of water in the steam cycle is very low, it is necessary to use an electrical conductivity sensor with a cell constant of 0.01cm-1. Dissolved Oxygen Measurement Depending on the chemical regime of the power plant, dissolved oxygen in certain sections such as the Deaerator outlet must be maintained.