Industrial Background
A gas-fired power plant is a circulation system that uses a gas turbine and generator together with a waste heat boiler and a steam turbine. It recovers the high-temperature flue gas discharged from the gas turbine and converts it into steam through a waste heat boiler, and then injects the steam into the steam turbine to generate electricity. Therefore, in the entire gas-fired power generation process, water and steam flow, temperature, process pressure and water quality monitoring are very important to ensure the safe operation of the entire circuit.
Gas power plant monitoring indicators
1. Flow measurement:
Raw water flow measurement: In gas-fired power generation systems, water is an important medium for generating steam, and steam will be consumed during the power generation process. Therefore, water needs to be continuously replenished to ensure the generation of steam and the stable output of electricity. Electromagnetic flowmeters are conventionally used to measure the raw water flow.
Circulating water flow measurement: The steam after the turbine works is condensed in the condenser. In order to measure the flow of cooling water, a flowmeter that does not damage the pipeline and can meet the large-diameter flow measurement is required. An external clamp-on ultrasonic flowmeter can be selected.
Steam flow measurement: The steam that has done work in the turbine condenses into water in the condenser, and then vaporizes under high temperature and high pressure in the waste heat boiler under the action of the pump, generating steam that enters the turbine and drives the generator to work. The steam finally condenses into water, and the whole process is repeated. For steam flow measurement, a vortex flowmeter or a thermal gas flowmeter can be selected.
2. Temperature measurement:
In gas-fired power generation, it is necessary to measure the temperature of transformers, generators and steam, monitor the operating status of equipment and the thermal cycle process, promptly detect abnormal conditions and take corresponding measures to ensure the normal operation of equipment and prevent equipment from overheating and causing damage or accidents. Temperature sensors such as thermal resistors and thermocouples can be selected.
3. Water quality monitoring:
pH: pH is an indicator to measure the acidity and alkalinity of water. Monitoring the pH value of circulating water and boiler water can help control the stability of water quality and prevent corrosion and scale.
Conductivity: Conductivity is an indicator to measure the electrolyte content in water. Monitoring the conductivity of circulating water and boiler water can help determine the purity of water quality and clean and replace water in time.
DO: Dissolved oxygen is an indicator to measure the oxygen content in water. Monitoring dissolved oxygen in boiler water and circulating water can help control the redox state of water and prevent metal corrosion and bacterial growth.
Gas Power Plant Monitoring System
The flow meter/water quality meter/temperature meter is used to monitor the flow, temperature, pH, conductivity, dissolved oxygen and other parameters in the entire gas-fired power generation process, and the measured parameters are transmitted to the back-end monitoring system in real time via RS485, or the data is uploaded to the cloud platform through the wireless acquisition module. According to the preset monitoring indicators and standards, remote real-time management and monitoring are realized, and the operating parameters of the equipment in the gas-fired power generation process are automatically adjusted to ensure the safe and stable operation of the power generation system.
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