Thermal power plant flowmeter

『Thermal power plant flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)

1. What are the commonly used instruments and meters in power plants? The commonly used instruments and meters in power plants can be divided into four categories according to their functions: temperature/pressure/flow/level instruments, analytical instruments, electrical instruments, and control system instruments.

1. Temperature/Pressure/Flow/Level Instruments 1 Temperature instrument • Thermocouple: Wide measurement range (-200 ℃ to+1800 ℃), used in high-temperature areas such as boilers, steam pipelines, and steam turbine intake and exhaust • Thermistor: Higher accuracy (Pt100 commonly used), suitable for medium and low temperature measurement (-200 ℃ to+850 ℃) • Bimetallic thermometer: Used for on-site indication, no power supply required, good vibration resistance 2 Pressure gauge • Pressure transmitter: using diffusion silicon or capacitive sensing principle, outputting 4-20mA signal with an accuracy of 0.075% • Intelligent pressure transmitter: equipped with HART/Profibus protocol, supporting remote configuration and diagnosis • Diaphragm pressure gauge: measuring micro pressure and negative pressure, used in wind and smoke systems • Diaphragm pressure gauge: measuring viscous and corrosive media 3 Flow meter • Standard throttling device (orifice plate, nozzle): used for steam and feedwater flow measurement, requiring differential pressure transmitter • Electromagnetic flowmeter: measures water and slurry flow, accuracy and collapse of 0.5% • Ultrasonic flowmeter: external clamp type suitable for large pipe diameter measurement, portable for calibration • Vortex flowmeter: measures saturated steam and gas flow 4 Level instrument • Differential pressure transmitter: measures the liquid level of the tank

, requiring zero point transfer • Radar level gauge: 26GHz high-frequency radar has become mainstream, with an accuracy of ± 3mm • Ultrasonic level gauge: suitable for occasions such as water and ash silos • Radio frequency admittance level switch: used for ash hopper and coal bin level detection

2. Analytical instruments • Water quality analyzer: pH meter, conductivity meter, dissolved oxygen meter, silicate analyzer, sodium ion monitor • Smoke beam shed bright emission monitoring system (CEMS): continuous monitoring of SO ₂ NOx、 Particle concentration • Hydrogen purity analyzer: monitors generator cooling hydrogen purity • Coal quality analysis instruments: industrial analyzer, calorimeter, sulfur analyzer

III. Electrical instruments • Energy meter: 0.2S level smart meter, compliant with DL/T 645 protocol • Power transmitter: converts AC power to DC signal • Insulation monitoring device: monitors DC system insulation condition • Fault recording device: records power system fault waveform

IV. Control system instrument • PLC: used for auxiliary machine sequence control, supports IEC 61131-3 programming • DCS: Mainstream systems include Siemens PCS

7. Emerson Ovation, Zhejiang University Central Control SUPCON • Safety Barrier: Intrinsically Safe and Explosion proof, Used in Hazardous Areas • Intelligent Valve Positioner: Improve Control Accuracy of Regulating Valves Selection Attention: Thermal power plant instruments need to meet high temperature and high pressure conditions, and nuclear power plant instruments need to meet nuclear safety level requirements. All instruments should be regularly calibrated, and the calibration cycle of pressure gauges should not exceed 6 months. Mandatory calibrati

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