The “retirement wave” of wind turbines is approaching, and the harmless treatment of a large number of decommissioned wind turbine blades is an important bottleneck for the wind power industry to achieve a complete green closed loop. Under the background of the country’s active implementation of energy conservation and carbon reduction renovations in coal-fired power plants, the co-processing of decommissioned wind turbine blades by coal-fired boilers can achieve the reduction, resource utilization and harmless treatment of solid waste. In response to the demand for large-scale continuous heat treatment of decommissioned wind turbine blades, a process route of coupling coal-fired boilers with pyrolysis-gasification of wind turbine blades is proposed. By extracting the flue gas from the boiler as the heat source for pyrolysis-gasification, the combustible oil and gas produced by pyrolysis-gasification are sent into the furnace for combustion, simplifying the processing procedure of wind turbine blades and reducing the initial investment. The process was simulated and verified by using Aspen Plus software. The results indicate that when the processing rate of wind turbine blades was 1 t/h, the proportion of flue gas extracted did not exceed 0.6%,　thereby meeting the energy requirements for pyrolysis-gasification. A pilot-scale experimental study was conducted based on a 7 MW chain grate boiler, and it was found that when the oxygen volume fraction in the flue gas was 5%~10%, clean glass fibers could be obtained through “one-step pyrolysis-gasification”. Based on both simulation results and experimental data, a flue gas conditioning-based integrated treatment process was proposed: control the flue gas temperature at 600~700 ℃ and the oxygen volume fraction at 5%~10% by blending flue gas from the economizer outlet and adding air, so as to enhance the strength of the recovered fibers and further simplify the wind turbine blade treatment process, providing a reference for the large-scale treatment of wind turbine blades.

Focusing on the structural safety of a three-column floating foundation for floating wind turbines, this study systematically assesses its stability, ultimate strength, and fatigue strength. A full-scale finite element model is established using the SESAM software suite. Intact and damaged stability analysis is conducted according to relevant codes. The result indicates that all parameters comply with regulatory requirements and demonstrate excellent anti-overturning capability. In the ultimate strength analysis, based on load conditions considering various wave directions, amplitudes, and periods, it is found that the maximum structural stress concentration occurs at the connections between the buoyancy tanks and columns. Nevertheless, the overall stress levels remain within the design resistance limits. Employing the hotspot stress approach, fatigue strength assessment of critical connection areas shows that the fatigue damage at all checkpoints is less than 1, satisfying the design life requirements. The floating foundation structure meets all applicable code standards for stability, ultimate strength, and fatigue strength. Therefore, the research provides a significant safety basis for the engineering application of floating wind turbines in deep-sea environments. It also offers valuable methodology and guidance for safety assessments of similar projects.

The rapid expansion of the cumulative installed capacity of wind power in recent years has driven the continuous growth of market demand for wind power operation and maintenance (O&M). Lubricating oil for wind turbine gearboxes is an indispensable and crucial component in O&M. The waste lubricating oil for wind turbine gearboxes is classified as hazardous waste due to its harmful components such as heavy metals and degraded additives. Its efficient recycling and harmless treatment are crucial for achieving clean development in the wind power industry. Firstly, based on the characteristics and composition of waste lubricating oil, the variation laws and underlying causes of typical performance indicators during operating are expounded, including kinematic viscosity, pour point, moisture content, particle contamination level, acid value, and elements (e.g. Fe, P, and S). These variations are primarily induced by factors such as external contamination, oxidation at high temperatures and pressures, and additive degradation. On this basis, the latest research progress in current waste mineral oil regeneration processes is systematically summarized, covering mainstream technical routes such as pretreatment, molecular distillation, solvent extraction, and hydrofining. Furthermore, the feasibility and limitations of the aforementioned methods in extending the service life of waste lubricating oil and realizing its recovery and regeneration are analyzed. The identified limitations include issues such as low treatment efficiency, insufficient processing depth, and restricted application. Finally, the future development directions of high-value waste oils represented by synthetic lubricating oil for wind turbine gearboxes are discussed from the perspectives of industrial development, technological advancement and life management. It emphasizes that establishing a classified recycling system, developing green and efficient regeneration processes, and implementing life management will be the key pathways to realizing a circular economy in the wind power industry.

To address the risk of system instability in conventional distributed control systems (DCS) in complex industrial settings which is caused by asynchronous evolution of control configuration data, a dynamic synchronization technology system covering the entire lifecycle of equipment is developed. It delves into the potential risk transmission mechanisms of DCS configuration data during conversion and synchronization, and presents a synchronization assurance mechanism based on dynamic verification and full-chain tracing. By creating a mirrored digital twin mapping model, it enables two-way mapping of configuration data between physical controllers and upper-computer systems. Together with a dual-state cooperative closed-loop synchronization protocol stack, this forms a triple-integrated architecture of “source-storage-operation”. Breaking through the limitations of conventional synchronization modes, this system ensures strong consistency of configuration data even under complex operating conditions. Verified in a thermal power plant’s DCS project, the proposed technical solution significantly improves the control system’s fault-tolerance under abnormal conditions, effectively ensuring safe and stable operation of power generation units. This offers key technological support for the independent and controllable upgrade of critical information infrastructure in the energy sector. The research holds great reference value for similar industrial control systems, and its design concept can be applied to various fields such as process industry and smart manufacturing.

With the expansion of glass fiber-reinforced plastic (FRP) products market, its output increases year by year. At the same time, the amount of its waste also increases dramatically. The number of waste FRP will increase explosively in the next few years. To develop a new way for recycling waste FRP, the broken waste fan blade powder is investigated. Firstly, the morphology and structure of the waste fan blade powder are tested. Secondly, the waste fan blade powder is modified by liquid coupling agent KH-550 and liquid paraffin, and then mixed with polyethylene (PE). Finally, the mechanical properties of the obtained material are analyzed. The experimental results show that, the longitudinal shrinkage rate of the modified composite reduced by 49.85% compared with that of the conventional formula, and the tensile strength, elongation at break and simply supported beam impact strength increased by 66.11%, 21.58% and 42.72%, respectively

In order to solve the technical problem that the cooling margin of the cylindrical hole is insufficient at low blowing ratios and the cold flow is separated from the wall at high blowing ratios, based on the tip-covered vortex generator (TCVG), a new type of vortex generator (VG) is proposed, which is called tile-shaped vortex generator (TVG). The conventional cylindrical hole and the cylindrical hole with TVG are numerically simulated. The results show that the film cooling efficiency of the cylindrical hole with TVG is 200% higher than that of the conventional cylindrical hole. Moreover, it solves the problem that the cold flow of the conventional cylindrical film hole will separate from the wall at high blowing ratios. With the increase of TVG width, the film cooling efficiency increases, and tends to be stable when the width reaches twice the film hole diameter. With the increase of TVG height, the suppression effect of TVG on cold flow is weakened, and there is an uncooled gap in the near-field area at high blowing ratios, and the film cooling efficiency shows a downward trend. The expansion angle of TVG has little effect on the film cooling effect, and the optimal expansion angle is 7.5°.

The hydrophobic resin-based solid amine adsorbent was prepared by modifying porous materials with different-molecular-weight polyethyleneimine (PEI), by taking hydrophobic oily macroporous adsorbent resin as carrier. The specific surface area, pore structure, functional group structure and thermogravimetric properties of the resin-based solid amine adsorbent were characterized by N₂ isothermal adsorption-desorption, infrared and thermal analysis. The effects of PEI loading, air humidity (30%~80%), adsorption time and multiple cycles on the adsorption performance of CO₂ were investigated. The results show that, the hydrophobic resin-based solid amine adsorbent has good trapping performance for CO₂ in dry air (air humidity is less than 50%). The SD300 resin-based solid amine adsorbent modified by 30%PEI can reach more than 90% of the total adsorption capacity after one hour adsorption in atmospheric environment. When the molecular weight of the PEI is 1 800, it shows high adsorption capacity and good cycle stability of adsorption and desorption, mainly due to the high pore size and its excellent high temperature resistance.

High-temperature environments can lead to the deterioration of the heat dissipation performance of indirect air cooling towers. Air inflow spray pre-cooling is an effective method to enhance the heat dissipation performance of indirect air cooling towers. Taking a 2×350 MW indirect air cooling unit in northwest China as the research object, a numerical model coupling the spray evaporation with the ventilation and heat dissipation of the indirect air cooling tower is established to study the effect of air inflow spray pre-cooling on the performance of the indirect air cooling tower with different environmental factors. The results show that crosswind can carry the spray downstream, causing the spray to accumulate and benefiting the radiators in the leeward area the most. The performance improvement of the radiators in the windward area decreases with the increasing wind speed, while the radiators in the side area even experience performance degradation at medium to high wind speeds. Additionally, as the wind speed increases, the spray flows out of the annular evaporation zone, resulting in some pre-cooled ambient air failing to enter the radiators and leading to spray waste and reduced effectiveness. The improvement rate of heat dissipation in the indirect air cooling tower after air inflow spray pre-cooling decreases at first and then increases with the increasing wind speed. At an ambient humidity of 40%, the heat dissipation improvement rate decreases from 5.65% at 0 m/s to a minimum of 2.03% at 8 m/s, and then rises to 3.98% at 12 m/s. The effectiveness of air inflow spray pre-cooling weakens with the increasing ambient humidity. Under windless conditions, as the humidity increases from 20% to 80%, the heat dissipation improvement rate of the indirect air cooling tower decreases from 6.4% to 2.4%.

To address the issues of reduced combustion efficiency and increased pollution caused by the easy deposition of pulverized coal particles from lower burners of coal-fired boilers in cold ash hoppers, a CFD numerical simulation method is used to comparatively analyze the boiler combustion characteristics under the working conditions before the supplementary lifting air is applied, when the swirl burners near the side walls are deflected by 5° toward the center of the furnace, and after the supplementary lifting air is applied. The results show that after the supplementary lifting air is applied, the lifting effect on the lower pulverized coal airflow is enhanced, the deposition amount of unburned carbon particles is reduced by 30.5%, and the burnout rate is increased to 99.44%. The deflection of the burners makes the flame narrow and elongated, reduces the temperature of the side walls, but increases the CO concentration in the cold ash hopper. The supplementary lifting air reduces the CO concentration by enhancing the O₂ supply at the bottom. After the lifting air is supplemented, the air staging is significantly intensified, the reducing atmosphere in the main combustion zone is enhanced, and the NO mass concentration (standard condition) at the furnace outlet is reduced from 315.3 mg/m³ to 282.1 mg/m³. The retrofit of theburner deflection and lifting air at the bottom of the boiler can effectively regulate the pulverized coal transport path, inhibit particle sedimentation, and reduce pollutant emissions. The research results can provide a theoretical basis and engineering practice guidance for related boiler transformations.

The distribution characteristics of the air flow field inside the natural-draft direct-air-cooling exhaust tower under low-temperature and low-load operating conditions still remain unclear. There is an urgent need to study its variation laws and propose effective measures to ensure exhaust performance and anti-freezing safety. Through the computational fluid dynamics (CFD) numerical simulation, the flow and temperature fields inside the tower at ambient temperatures of –21 ℃ and –30 ℃, and at different wind speeds are analyzed. The results indicate that, based on the symmetrical operation of steam isolation valves for sector switching of the air-cooled condenser, using louvers to regulate airflow in isolated sectors can effectively optimize the internal airflow field, ensure smooth exhaust under low-temperature conditions in winter, and significantly reduce the risk of localized freezing. Field tests verified that this measure can reduce the unit backpressure by approximately 2 kPa and improve the flue gas flow deviation.