What Are the Requirements for Instruments and Valves Under Different Conditions In the Power Industry

In the power industry, instruments and valves play a crucial role. Their significance extends beyond equipment monitoring and control, impacting the reliability, safety, and economy of the entire power generation process. Together, they build a highly automated, intelligent power system, providing reliable technical support to meet energy demands.

In the power industry, diverse operating conditions impose significant variations in the requirements for measuring instruments and valves. This variation arises from factors such as temperature, pressure, medium type, and flow rate in the working environment. The following summarizes the requirements for instruments and valves under different conditions.

What Are the Requirements for Instruments and Valves Under Different Conditions In the Power Industry

Power Plant Boiler System

The power plant boiler system is a core facility in the power industry, operating in a challenging environment with high temperature, high pressure, and intense corrosion in the combustion area. It is responsible for converting fuel energy into steam to drive the generator for electricity generation. By monitoring combustion parameters, it enhances fuel efficiency, reduces emission levels, and meets environmental standards. The system’s reliability is crucial for stable power supply, requiring regular equipment status checks and preventive maintenance.

The power plant boiler system places important demands on measuring instruments and valves in the power industry, ensuring safe, efficient, and reliable power generation operation.

Requirements

Temperature instruments: High-temperature-resistant, fast-response thermocouples or resistance temperature detectors (RTDs) for monitoring temperatures in the combustion area, superheaters, and reheaters.

Pressure instruments: High-precision, high-temperature-resistant, highly reliable pressure sensors for monitoring boiler steam pressure.

Flow instruments: Flow meters that can withstand high temperatures and pressures, used for measuring the flow of feedwater, fuel, and steam.

Level instruments: High-temperature, high-pressure level indicators to ensure accurate monitoring of boiler water levels.

Valves: High-temperature, high-pressure control valves for precise control of feedwater and steam flow.

Transformer Cooling System

The transformer cooling system plays a crucial role in the power industry. An efficient cooling system ensures stable transformer operation, extending its lifespan and performance. Oil-cooled transformers use oil circulation for heat dissipation, effectively lowering temperatures to ensure safe equipment operation. Additionally, air-cooling systems, suitable for specific environments, reduce maintenance costs. Regular cooling system checks and maintenance are essential for ensuring system reliability, contributing to overall power system efficiency and reliability.

Requirements

Temperature instruments: Temperature monitoring of transformer oil, requiring good oil resistance and long-term stability.

Flow instruments: Monitoring the flow of cooling oil, requiring oil resistance and ensuring measurement accuracy.

Level instruments: Detection of changes in oil level in the cooling system, requiring good oil resistance.

Valves: Control valves with good oil resistance for regulating the introduction of chemical agents into the cooling system.

Power System Steam and Water Treatment

Steam and water treatment in the power system are crucial, directly affecting power generation efficiency and equipment lifespan. Proper water treatment prevents scaling in pipes and equipment, enhances heat transfer efficiency, and reduces energy consumption. Effective steam control helps prevent corrosion and wear on turbine blades, improving system reliability. In summary, excellent steam and water treatment solutions can reduce maintenance costs, extend equipment lifespan, and enhance overall operational efficiency of power plants, holding significant importance in the power industry.

Requirements

Temperature instruments: Corrosion-resistant thermocouples or RTDs for monitoring steam and water temperatures.

Pressure instruments: Corrosion-resistant pressure sensors for monitoring pressure in water pump and pipeline systems.

Flow instruments: Turbine or electromagnetic flow meters for measuring the mass or volumetric flow of water.

Water Quality: Online water quality analyzers monitoring pH and conductivity for real-time monitoring of water quality changes in the water treatment process.

Valves: Corrosion-resistant control valves for precise regulation of chemical agent introduction into the water treatment system.

Transmission and Distribution Systems

Transmission and distribution systems are vital components of the power industry. The transmission system transports large currents generated by power plants to distant users, while the distribution system allocates electricity to end-users. In recent years, the power industry has made significant progress in improving transmission efficiency and reliability through innovative means such as smart grid technology and high-voltage direct current transmission. The distribution system continually optimizes to meet the challenges of integrating renewable energy, adopting advanced monitoring and control technologies. These developments drive the intelligence and sustainability of power systems, enhancing the efficiency of energy transmission and distribution.

Requirements

Temperature instruments: Infrared thermometers for monitoring the surface temperature of distribution equipment, enabling contactless measurement to prevent hot spot issues.

Valves: Control valves for ventilation and cooling systems, ensuring effective heat dissipation.

Environmental Protection and Emission Monitoring

The power industry plays a crucial role in environmental protection and emission monitoring. Advanced monitoring technologies, such as Continuous Emission Monitoring Systems (CEMS) and online environmental monitoring systems, enable power plants to monitor and report gas, water, and noise emissions in real-time. This not only helps comply with environmental regulations, reducing environmental impact, but also enhances energy efficiency. With intelligent data analysis, power companies can optimize operations, minimize unnecessary emissions, and respond accurately to environmental protection requirements.

Requirements

Temperature and Pressure instruments: Monitoring the reactor’s temperature and pressure in desulfurization and denitrification systems.

Flow instruments: Controlling and monitoring gas and liquid flow in the flue gas treatment system.

Water Quality: Monitoring pH and conductivity in the emission water treatment system to ensure compliance with emission standards.

Conclusion

When selecting suitable instruments, considerations extend beyond the physical and chemical properties of the medium. Factors such as the installation location, environmental conditions (humidity, vibration, etc.), measurement range, accuracy, response time, maintenance costs, and lifespan should also be taken into account. In practical applications, these instruments and valves must adhere to safety standards in the power industry and withstand the harsh industrial environment.

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