Boiler Steam Cycle

TIME: 2023.10.09 NUMBER OF VIEWS 229
Industrial Background

    Steam-water circulation is the main process of thermal power generation. The steam that has completed the work in the steam turbine condenses into water in the condenser. Then, the condensed water enters the low-gas and high-gas under the action of the pump, and vaporizes under the high temperature and pressure of the boiler to form The steam enters the turbine, drives the generator, and eventually condenses into water, repeating the entire process.

Boiler water vapor circulation monitoring system

In the steam-water cycle, water and steam flow, temperature, process pressure, and water quality monitoring are all important to ensure the safe operation of the entire loop.

Flow measurement

    In the thermal power generation process, accurate measurement of fuel, boiler feed water, steam and other flows is of great significance and role, helping to improve production efficiency, save energy resources, and ensure safe production.
    In the boiler feed water system, due to the loss of water volume, water needs to be replenished. Generally, raw water is added, and raw water is usually taken from river water, and the water quality is poor. Electromagnetic flowmeters are usually chosen to measure flow because they have high measurement accuracy, good stability, corrosion resistance and low cost.
    The steam after the steam turbine performs work is condensed in the condenser. The greater the amount of condensed water, the higher the heat exchange efficiency. By recycling condensed water, water resources can be effectively saved and energy efficiency improved. Ultrasonic flowmeters are usually chosen to measure flow. They are installed with external clamps. They do not break the pipe, do not stop production, and have no pressure loss. They are suitable for measuring large-diameter pipelines.

Temperature measurement

    In the process of thermal power generation, accurate measurement of temperature is very important because it is related to the efficiency and safety of the entire power generation process. Thermal resistors or thermocouples are usually chosen because they have high measurement accuracy, wide temperature measurement range, fast response time, and good long-term stability.
    Monitoring the temperature changes of steam can ensure the safe operation and efficient operation of the steam system and help improve energy efficiency.
    The cooling tower needs to monitor the temperature of the cooling water, and the temperature of each component inside the turbine needs to be monitored to ensure normal operation and safety.

Water quality measurement

    Water quality monitoring in the soda and water cycle minimizes corrosion of pipelines and other equipment, thereby avoiding unplanned downtime.
    The steam entering the turbine must be generated by heating ultrapure water. The pH is usually measured to ensure that the pH of the feed water is within the alkaline range and reduce pipeline corrosion.
    If the conductivity is too high or too low, it will increase the possibility of water scaling and increase the corrosion of turbine blades, leading to the risk of damage.
    In order to avoid severe pitting corrosion in the boiler, extend the service life of the boiler, and ensure efficient and stable production, the oxygen content in the boiler water must be reduced, and a dissolved oxygen meter that can measure trace oxygen (ppb) needs to be selected.

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