The scope of maintenance and technical renovation services for power plants includes comprehensive work such as periodic inspection, maintenance, and repair of power plant equipment and systems in operation or outage. This involves enhancing performance through technical upgrades and equipment updates, eliminating equipment defects, extending service life, and improving safety and efficiency. By combining maintenance and technical renovation, the service life of power plant equipment is extended, while achieving comprehensive improvements in safety, environmental protection, and economy, adapting to the intelligent and low-carbon development needs of the power system.
It mainly covers the following aspects:
Ⅰ. Power plant maintenance and repair
1. Preventive maintenance (regular maintenance)
- Routine maintenance: equipment cleaning, lubrication, inspection of fasteners, regular replacement of wear parts; insulation testing of generator stator/rotor, chromatographic analysis of transformer oil, troubleshooting of cable insulation aging; wear testing of turbine blades, measurement of bearing clearance of feedwater pumps, valve leak testing.
- Planned maintenance: Conduct in-depth maintenance by shutting down equipment according to specific cycles (such as major maintenance, medium maintenance, and minor maintenance), including activities like opening the cylinder of a steam turbine for maintenance and replacing the heating surface tubes of a boiler。
2. Fault maintenance (post-maintenance)
- Conduct emergency repairs for sudden failures, restore equipment functionality, and analyze the root cause of the failure to prevent similar issues from recurring.
3. Condition-based maintenance (predictive maintenance)
-Utilize online monitoring technology (such as vibration sensors and infrared temperature measurement) to track equipment status in real-time, and combine data analysis to arrange maintenance in advance.
II. Technical transformation of power plant
1. Equipment upgrade and renovation
- Main equipment: modification of the flow passage of the steam turbine and modification of the boiler combustion system.
- Auxiliary equipment: Replace old motors with high-efficiency energy-saving models, and upgrade traditional valves to smart electric valves.
2. System performance optimization
- Thermal system: Increase the number of stages of the regenerative heater and modify the copper tubes of the condenser.
- Electrical system: upgrade of generator excitation system, and modification of frequency converter in the auxiliary power system.
3. Automation and intelligentization transformation
- Deploy intelligent DCS systems, introduce AI-based fault diagnosis platforms, and install robotic inspection systems.
4. Environmental protection and energy-saving renovation
- Environmental protection upgrade: installation of SCR denitration device and efficiency improvement renovation of wet desulfurization.
- Energy-saving technological transformation: waste heat recovery and utilization, and optimization of circulating water system.
5. Safety and reliability improvement
- Replacement of old cables, upgrade of lightning protection and grounding system, and redundancy modification of turbine protection system.
6. Renewable energy and flexibility retrofit
- New energy coupling: Constructing energy storage systems in conjunction with coal-fired power plants and integrating photovoltaic/wind power consumption facilities.
III. Special value-added services
- Equipotential testing of wind turbine blades: Equipped with two six-axis high-load multi-rotor drones, professional equipotential testers and grounding resistance testers are used to conduct equipotential continuity testing of wind turbine blades, ensuring that the potential of each part of the blades is balanced and the lightning protection system operates normally.
- Line icing treatment: Icing on transmission lines in winter poses a serious threat to the power system. It is necessary to formulate emergency plans, monitor the icing situation of lines in real time, increase the frequency of inspections, apply anti-icing coatings, and adopt physical de-icing methods. Under the premise of ensuring uninterrupted power supply to the lines, drones equipped with robotic arms, scrapers, or vibration devices can be used to carry out de-icing operations, which are cost-effective and efficient.