To solve the problem that the blade icing occurs normally in many wind farms constructed in domestic northern and southern-central area during winter operation, the blade icing mechanism of the wind-generator set was discussed, while the advantages and disadvantages of types of anti-icing and de-icing techniques were compared and analyzed in detail. Results show that the combined scheme of anti-icing with coating and active de-icing has high application potential, which can ensure the safety and high efficiency of the wind-generator set operation.

A zero carbon emission energy system was established for a civil comprehensive park with various business types, and the energy storage system was used to coordinate the matching between the self-generation supply power and the park demand power. The energy flow of the cooling and heating equipment was analyzed under the system working condition, and the dynamic model of the equipment was established. The system performance was evaluated with the analysis of indicators such as the primary energy saving ratio and the carbon dioxide emission reduction ratio, and with the research of the flexibility of the park after energy storage scheduling. Results show that the primary energy saving ratio and the carbon dioxide emission reduction ratio of the energy system change from 33.0% to 100.0% and from 22.7% to 100.0%, respectively. The goal of zero carbon emission can be achieved when the supplementary power is fully matched with the nearby green energy power such as wind energy and solar energy.

To solve the problem that the stress corrosion cracking of the nickle-based weld normally occurs with the primary circuit coolant in pressurized water reactor nuclear power plants during operation, identifications, analyses and discussions were conducted on following repair technologies according to ASME BPVC standards, such as flaw removal, piping butt weld overlay, piping butt weld inlay or onlay, J groove weld embedment, J groove weld internal mid-wall surface repair, J groove weld outer surface pad repair, and J groove weld mechanical seal repair. This may serve as a reference for the repair technology selection of the nickle-based weld in nuclear pressure vessels.

To solve the problem that the boiler water wall tube inspection in power units with scaffolding or lifting platform has a high safety risk and huge cost, a digital radiography (DR) detection system for water wall climbing robot based on remote control was researched and developed with the combination of X-ray flaw detection machine, DR Plate detector and automatic wall climbing robot, while a field DR detection of water wall tube was carried out in a 300 MW coal-fired power unit. Test results show that the detection system has a reliable stability, convenient usability and accurate positioning. This may realize the real-time detection of defects online, and improve the speed and efficiency of detection significantly.

During the 14th Five-Year Plan period, the technology research and the industry application of the solar thermal power generation would have a rapid development. By summarizing the basic profile and industry status of the solar thermal power generation domain, researches and analyses were conducted on the system form, the subsystem technology and corresponding advanced technologies of the solar thermal power generation, while the outlook was carried out for the prospect of the solar thermal power generation technology based on the levelized cost of electricity and the installed capacity.Through analysis, for the development route of the solar thermal power generation during the 14th Five-Year Plan period, the key tower solar thermal power generation technologies should play a main role, and technologies such as the key equipment, the thermal storage media and the control software should get a breakthrough, while the disc solar thermal power generation technology and the distributed solar thermal power generation technology need a balanced development. The industrial route should focus on promoting the scale expansion and the commercialization of the tower solar thermal power generation, while should give consideration to the development and application of distributed solar thermal power generation products, and the multi-energy complementation and multi-generation application of the solar thermal power generation.

The ash deposition from the combustion of Zhundong coal can be alleviated with the addition of kaolin, while the cost of the method is high. Taking the Zhundong coal ash with different particle sizes as the additives, combined with the ash deposition experiment in a drop tube furnace and the sintering experiment in a fixed bed furnace, an evaluation was conducted on the control effect of ash deposition of Zhundong coal ash with different particle sizes. Results show that the composition and the mineral distribution of Zhundong coal ash with different particle sizes are distinct, and the content of silicon-aluminum minerals such as mullite in coal ash of more than 100 μm is significantly higher than that in the coal ash of other sizes. The ash depositon on the heat exchange surface is easily to be removed with the the addition of coal ash of more than 100 μm, however, the coal ash of less than 50 μm not only could not prevent the development of deposition, but also could aggravate the removal difficulty of the deposited ash. The less removal difficulty of the deposited ash on the heat exchange surface is mainly caused by the weaker sintering with the addition of coal ash of more than 100 μm.

Taking the construction of a rooftop photovoltaic (PV) power station as a research example, the power generation capacity of the station under the local climatic conditions was calculated theoretically, while the construction scheme of the rooftop PV station was put forward, including the type selection of the PV module, the selection of the inverter capacity and the corresponding connection method, the design of the PV array, etc. The proposed scheme not only has good environmental and social benefits, but also has certain economic benefits. This may serve as a reference for the construction of rooftop PV power stations.

To solve the problem that the exhaust steam from the back pressure steam turbine (BPT) can not enter into the heating header with the decreased pressure in a 1 000 MW thermal power unit under deep peak regulation condition, a retrofit was conducted on the exhaust steam of the BPT by adding the extraction pipeline from the high temperature reheater steam tube, while the heating capacity of the unit was analyzed and calculated with different opening degrees of the intermediate pressure (IP) control valve. Results show that, with the improved pressure of the high temperature reheater by decreasing the opening degree of the IP control valve, the BPT can operate safely and continuously under deep peal regulation condition. Additionally, the heating capacity is improved by extracting steam from the high temperature reheater. When the unit load reduces to 350 MW, the mass flow of the heating extraction steam can reach at 115 t/h with the heating steam pressure of over 1 MPa and the heating steam temperature at around 320 ℃.

For the No. 5 boiler flue gas desulfurization system of a coal-fired power plant, to solve the problem of the frequent shafting fault of the booster fan after the operation mode changing from the fixed frequency operation to the variable frequency operation, by comparing the working conditions before and after the frequency conversion retrofit of the booster fan, and combining the change of the fatigue safety factor of the booster fan shafting, it is found that the shafting fault is mainly caused by the increased alternating stress and inertial force during the variable frequency operation, which leads to the fatigue safety factor of the booster fan shafting is lower than the design value under the variable frequency operation. Through the reinforcing retrofit for the impeller, the long and short shaft, the coupling and other parts of the shafting with checking, the existed fault can be effectively solved and the reliability of the equipment can be improved.

To solve the problem of the tube explosion of the secondary platen superheater in a 350 MW sub-critical coal-fired power plant, analyses were conducted on the tube explosion reason with the macro-morphology observation of the burst, the hardness measurement, the logic analysis of the attemperating water for superheater, etc. Results show that the tube explosion is caused by the short-term overtemperature of the superheater tube, which is resulted from the water plug of the superheater. The tube explosion possibility of the platen superheater can be reduced through optimizing the logic the of the attemperating water for superheater and formulating multi-level preventive measures. This may ensure the safety and stability of the unit operation.

Analyses were conducted on the mechanism of stress corrosion and the cause of stress corrosion crack propagation of the steam turbine low-pressure impeller in nuclear power units, and the calculation model for stress corrosion crack propagation life was established combined with Clark model and Pairs model in the corrosion environment. Taking the second and third stage impeller blade root grooves of the low-pressure steam turbine in a nuclear power unit as the research object, the propagation life of stress corrosion crack was researched and analyzed. Results show that the crack propagation life calculated according to the stress corrosion crack propagation rate with the two models can meet the requirement of the service life (60 years ) of the serviceable part of the steam turbine in nuclear power units. The crack propagation life from Pairs model is more conservative than that from Clark model, and the safety factor can be selected within 2-3 when estimating the crack propagation life with Clark model, while the change of temperature has a significant influence on the crack propagation rate with Clark model.

Researches were conducted on the influence of the variable load on the fatigue life of the economizer inlet pipeline structure in a 600 MW thermal power unit, the relationship between strain and fatigue life was obtained through following three methods, such as material tensile test, fatigue test, and numerical simulation method. Results show that, the fatigue life of material tensile test is quite different from that obtained by fatigue test, while the fatigue life of numerical simulation method is in accordance with that of fatigue test. The fatigue performance of the structure can be reasonably evaluated by numerical simulation method, while the life loss of the structure significantly increases with the increase of the change range of the unit load.

For a 300 MW thermal power unit, to solve the problem of the coking occurring in the tangentially fired boiler with coal blending, tests were conducted on the unit, and the combustion system was optimized and retrofitted. Test results show that the decrease of the coal mill output is caused by the the small area of the primary air nozzle, which leads to the coking of the water wall. Through improving the coal mill output with the decrease of the primary air velocity, the boiler load can be increased, while the concentration of the reducing atmosphere near the furnace wall can be decreased. The retrofit has a good effect, which can serve as a reference for the solution of the problem in similar units.

An introduction was presented on the technical characteristics and application scenarios of compressed air energy storage, and based on the development circumstance of the domestic compressed air energy storage technology, researches and analyses were conducted on the orientation of compressed air energy storage station in the future new power system. After which, the economy of compressed air energy storage station with different air storage methods was researched and analyzed. The cost of compressed air energy storage station is 6 000-11 000 yuan/kW obtained from comprehensive analyses, while the application of compressed air energy storage station should combine with operation mode.

In order to improve the economy of a SGT5-4000F gas-steam combined cycle unit, the warm-up load optimization was adopted. Combined with the intermediate pressure bypass control mode of the unit, abnormal cases of steam turbine startup after optimization were analyzed. Results show that, the warm-up load optimization method can indeed shorten the startup time of the unit, but at the same time, this method will cause abnormal cases in which the steam turbine cannot startup in summer. The steam turbine can startup normally by increasing the warm-up load of gas turbine or reducing the upper limit of the intermediate pressure bypass under automatic setpoint control mode (ASA control mode) appropriately.

Systematic comparisons were conducted on core loss test and electro-magnetic core imperfection detector (ELCID) test with practical applications, and analyses were carried out from the aspects of technologies, resources and costs. Research results and practical experience show that, when the stator core does not have severe faults, ELCID test has the similar detective effect with core loss test, while has advantages in convenience and cost. When the stator core has confirmed faults, core loss test should be carried out to thoroughly evaluate the severity of the fault. It is suggested that the fault detection method of generator stator core should be selected through considering the operation of generator. Research results may serve as a beneficial reference for fault detection methods and strategies of stator core in similar large generators.

In order to improve the power performance of large-capacity megawatt-class hydrogen internal combustion engine for power generation and prevent the abnormal combustion such as preignition, flash back and detonation, detail analyses were conducted on the key technologies of hydrogen internal combustion engine from the aspects of hydrogen injection technology, combustion strategy and air-fuel ratio control strategy, exhaust gas recirculation technology, turbo-charging technology, hydrogen nozzle technology, and exhaust gas after-treatment technology. Results show that, for the large-capacity megawatt-class hydrogen internal combustion engine, the widely used technology of air intake injection at present has a disadvantage of a poor power performance of internal combustion engine, while through adopting the direct injection technology, the power performance can be improved and the risk of flash back can be reduced. The risk of detonation can be reduced with the application of lean mixture combustion, and the nitrogen oxide (NO_x) emission can be reduced with the application of a mature exhaust gas after-treatment technology by ammonia (NH₃)-selective catalytic reduction (SCR).

Considering the existing water ring vacuum pump unit in a thermal power unit condenser, a steam injection vacuum system was installed, and a set of control logic was designed for this system. Based on the characteristics of the steam injection vacuum system, the control requirements and the logic design schemes of the system control strategy were researched and determined, while the method of using the sequential step program to configure the key process logic was proposed. After which, the application of the system logic design was verified. Verification results show that after the retrofit of the vacuum system, the annual average vacuum of the condenser is improved when the steam injection vacuum system is put into operation, which can reduce the heat consumption rate and improve the economy during unit operation, while the reliability of the unit operation can be improved with the addition of the available equipment in the vacuum system. This may serve as a reference for the engineering application of similar control strategies.

Taking a 50 MW class steam turbine with steam supplement for waste heat utilization as the research object, the measurement method of the steam dryness at inlet of the steam separator was proposed, and the pressure loss of main stop valve and control valve was analyzed. The correction coefficient of generator output power of this type of unit was given, while the unit performance was tested and verified according to ASME PTC6—2004 code. Test results show that the corrected generator output power is 53 115.9 kW, which is 1 605.9 kW more than the design value of 51 510.0 kW. It is proved that the unit performance can meet the design requirements.

Based on the material application of high-temperature components in domestic 600 ℃ ultra-supercritical (USC)boilers, the main factors of material selection of 650 ℃ advanced ultra-supercritical (A-USC) boilers were proposed and illustrated. Combined with the research and development circumstance of domestic and abroad advanced materials for boilers, several key candidate materials were comprehensively compared from following aspects, such as the material economy, allowable stress, welding performance, inclusion criteria, safety of material supply, and material peculiarity of headers and tubes. Results show that, for domestic 650 ℃ A-USC boilers, Sanicro25 (C-HRA-5) advanced austenitic heat-resistant steel or HT700T alloy can be applied to high temperature heating surfaces, and HT700P or GH984G alloy can be applied to headers and tubes. The research about boiler high-temperature alloy is not mature enough at present, therefore it is suggested that further researches can be carried out on the safety issues of candidate materials used in headers and tubes, as well as the standardization issues of engineering applications, while the endurance strength data of materials at high-temperature can be accumulated continuously.

For a thermal power plant, the continuous emission monitoring system (CEMS) was adopted to realize the measurement of carbon monoxide (CO) and oxygen (O₂) in boiler flue gas, and the air-oxygen cascade control system was designed and optimized to realize the combined control of CO and O₂. Actual application results show that this system can effectively monitor the CO content and reduce CO generated in boiler combustion. Through providing data for the boiler combustion adjustment, this system can improve the boiler efficiency, alleviate the the high temperature corrosion in boiler water wall, and improve the safety and economy of boiler operation.

For heaters in nuclear power units, U-shaped heat transfer tubes of different types of heaters were tested with different eddy current testing methods. Comparisons were conducted on conventional eddy current testing and far field eddy current testing through following aspects, such as testing principles, scheme implementations and defect analyses. Results show that, conventional eddy current testing has a high sensitivity for detecting depressions, while far field eddy current testing has a high sensitivity for detecting internal and external injuries with a certain depth. Defects in high and low pressure heaters are mainly concentrated in the outer U-shaped heat transfer tubes and the transition zone between the straight tube and the bent tube. This may provide a reference for eddy current testing of heat transfer tubes of high and low pressure heaters in similar nuclear power units.

In order to predict the influence of mixed biomass (after low temperature pyrolysis treatment) on the actual operation of coal-fired boiler, the combustion characteristics, flue gas composition, and heat flux distribution of a 350 MW corner tangentially fired boiler were simulated and analyzed through using FLUENT software. Following three working conditions were considered, such as pure coal combustion, biomass blending with a calorific value ratio of 20% and 40%. The simulation results show that, biomass blending with a calorific value ratio of 20% leads to an average temperature increase of 22 K in the furnace, 20 K in the primary combustion zone, and 37 K in the zone from the over-fire air to the furnace arch, as compared to the working condition of pure coal. When the calorific value ratio of blended biomass is increased from 20% to 40%, the temperature is almost unchanged. After blending biomass, there is an observed increase in the volume fraction of carbon monoxide (CO) within the primary combustion zone, ranging from 2.103×10^-6 to 2.962×10^-6. However, the volume fraction of CO within the over-fire air zone consistently remained in close proximity to zero. The volume fraction of oxygen (O₂) in the primary combustion zone is decreased by 0.5% to 1.0%. At the elevation of 45 m, the volume fraction of O₂ in three working conditions is measured to be 2.9%, 3.2%, and 3.6%, respectively. The mass concentration of nitrogen oxides (NO_x) experiences a reduction ranging from 140 mg/m³ to 182 mg/m³. The heat flux does not change much and does not significantly affect the heat absorption of the water wall.

A mathematical model of a gas-steam combined cycle unit and its system was established. An improved model of the steam power part of the combined cycle unit was proposed. The accuracy of the model was verified by the measured data. The improved model refines the motion equation of the steam power cycle components, and improves the speed and accuracy of the unit dynamic response. The unit model can meet the requirements of primary frequency regulation of the power grid. The combined cycle unit takes a long time to achieve stable power output due to large thermal inertia when disturbed. The results provide a reference for the study of frequency regulation performance and load stability of the combined cycle unit.

With the application of a new type of nanofluid coolant in wind turbine generator set cooling system, the influence of the nanofluid coolant on the power generation efficiency and heat dissipation efficiency of the wind turbine generator set was researched. Results show that, with the application of nanofluid coolant compared with domestic coolant, the power generation efficiency is increased by 4.9% to 6.2%, and the heat dissipation rate is increased by 10% to 27%. Within the allowable range of the total heat exchange capacity, the method of changing nanofluid coolant can obtain the same cooling effect as increasing the heat dissipation area of the heat exchanger. Through utilizing the high thermal conductivity, low corrosion rate, and high boiling point characteristics of nanofluids, the power generation efficiency can be increased and the equipment maintenance costs can be reduced. This technology has a practical application and is feasible.

According to the characteristics of reheat section extraction steam heating mode, a method of thermal economy calculation was presented. Taking domestic thermal power units as the research examples, comparisons and analyses were conducted on the thermal economy of extraction steam heating mode through cold reheat section and hot reheat section based on different unit loads and different unit capacities. Calculation results show that, under the same heating steam flow rate, the thermal economy of the unit increases with the decrease of the unit load, and the energy saving advantage of the extraction steam heating mode through cold reheat section dwindles compared with through hot reheat section. Additionally, the thermal economy of the small capacity unit is better than that of the large capacity unit under heating condition.

When calculating the wear loss of economizer tubes in a 670 MW supercritical boiler based on the existing wear loss calculation model for tubes, there was a high error rate between the calculated and measured wear losses. The wear losses of economizer tubes were respectively calculated with the calculation result correction method and empirical parameter correction method, while comparisons and analyses were conducted on the above two methods. Results show that, when using the empirical parameter correction method, the average error rate between the calculated and measured values of wear loss is only 3.14%, and the correction effect of the empirical parameter correction method is better than that of the calculation result correction method. This may provide a reference for the wall thickness monitoring and condition maintenance of economizer tubes in similar supercritical boilers.

For an integrated gasification combined cycle (IGCC) unit, analyses were conducted on the problem of the frequent overheating and burnout of the burner nozzle tip during commissioning and operation, and three retrofit schemes was proposed and compared. Test results show that through changing the dimension of the nozzle tip, upgrading the material of the nozzle tip, etc., the overheating of the nozzle tip can be alleviated effectively, while the service life of the burner nozzle can be increased.

The application of organic Rankine cycle (ORC)has outstanding advantages with low-temperature waste heat recovery in boiler. For a 330 MW coal-fired boiler, an ORC power generation system with low-temperature waste heat recovery was designed for power supply within station, and following indicators were calculated, such as the auxiliary power consumption rate, thermal efficiency of power supply, standard coal consumption rate of power supply, carbon emissions intensity of power supply and payback period. After which, an analysis was conducted on the economy of the boiler coupled with ORC power generation system. Results show that, with the application of the boiler coupled with ORC power generation system, the average auxiliary power consumption rate is decreased by 0.18 percentage points, the average thermal efficiency of power supply is increased by 0.07 percentage points, the average standard coal consumption rate of power supply is decreased by 0.7 g/(kW·h), the average carbon emissions intensity of power supply is decreased by 1.52 g/(kW·h), and the payback period of this technology is 7.04 years. The technology of boiler coupled with ORC power generation system through low-temperature waste heat recovery has certain economic benefits.

A prediction model of flow accelerated corrosion (FAC) rate of reducer was established based on FLUENT software, and the effects of expansion ratio and inlet flow velocity on FAC in reducer were analyzed. Results show that, the FAC rate is positively correlated with the inlet flow velocity when the expansion ratio is the same, while the FAC rate is negatively correlated with the expansion ratio when the inlet flow rate is the same. The FAC rate increases first and then decreases under the condition with the same expansion ratio and inlet flow rate, which shows the same trend as the corrosion depth. This can serve as a reference for the failure location of the reducer section, so as to reduce the occurrence of reducer accidents caused by FAC effectively, which has a great significance for improving the safe operation of the unit.

There was a potential vibration hazard during the commissioning of a 1 000 MW steam turbine generator set in a power plant. By collecting, storing and analyzing the vibration signals of the unit, the fault characteristics of the unit were summarized and classified, and the unbalance of the unit rotor was determined. Based on the harmonic component method, the dynamic balance test was conducted on the unit and the balance adjustment was carried out for the unit, which solved the problem of large shafting vibration of the unit and made the vibration of each unit bearing liner reach a normal level. It provides a reliable method for other shafting balancing methods to improve the balancing accuracy and reduce the start-stop frequency of the unit, and at the same time provides theoretical guidance and practical proof for the first weight of the same type unit.

Film cooling is an important cooling form of gas turbine blades, and the study of flat plate film cooling can provide an important reference for turbine blades with film cooling. Based on orthogonal experiment, researches and analyses were conducted on the effects of the air film pore inclination angle, blowing ratio and main stream turbulence on the film cooling efficiency through numerical calculation. Results show that, the air film pore inclination angle, blowing ratio and main stream turbulence all have an effect on the film cooling efficiency, while the air film pore inclination angle has the most significant effect among the above three factors. In the case of the flat plate covered by air film with smaller pore inclination angle, a better effect can be obtained with the flat plate widely covered by low temperature gas.

The rotary air preheater has the inherent defect of air leakage, and the radial air leakage is the most influential air leakage form. Taking the tri-sector air preheater of a 600 MW unit boiler in a power plant as the research object, the characteristics of radial air leakage were researched based on the whole modeling of air preheater, while systematic analyses were conducted on the influence of the air leakage rate on the rotor area with a high risk of corrosion and ash accumulation, and the boiler efficiency. Results show that, the exhaust gas temperature of air preheater increases with the increase of radial air leakage rate at the hot end, and decreases with the increase of radial air leakage rate at the cold end; meanwhile, the radial air leakage at the cold end may aggravate the low temperature corrosion. Compared with the radial air leakage at the cold end, the radial air leakage at the hot end has a greater influence on the exhaust gas heat loss, and the exhaust gas heat loss increases with the increase of radial air leakage rate. When the radial air leakage rate at the hot end of the air preheater increases 1%, the boiler efficiency will decrease by 0.02% under boiler maximum continuous rating (BMCR) condition.

Taking a 100 MW/200 MW·h electrochemical energy storage power station in Shandong province as the research object, analyses were conducted on the power station auxiliary equipment power and main heat source of the battery compartment in typical summer day, so as to research the scheme of reducing the auxiliary power consumption rate. Results show that, the solar thermal radiation can be insulated through setting photovoltaic modules on the top of battery-compartment firewall, while the annual total electric energy saving is 1 565.5 MW·h and the daily auxiliary power consumption rate is decreased by 1.87 percentage points. The static investment payback period of this project is about 5.3 years, which has a good economic benefit. This may serve as a reference for the engineering design and operation retrofit of electrochemical energy storage power stations.

The peaking operation parameters of a 300 MW thermal power unit were collected and subjected to spectral analysis through using fast Fourier transformation (FFT) to identify the characteristics of peaking operation for the unit. The fatigue damage of high-pressure steam pipe during peaking operation was studied by finite-element calculation. Results show that, when the unit load is not less than 128 MW, the load is closely related to fluctuations in the steam pressure but not to the main steam temperature. The frequency of peak regulation occurs twice daily, accounting for half of the total days of peaking operation; peak regulation once a day accounts for one-third of the total days while peak regulation three times a day is low. Under the conditions of well-designed and well-applied support hangers for high-pressure steam pipes and a peak regulation load rate of not less than 42%, the high-pressure main steam pipe can operate for 6.25×10⁵ days with peak regulation twice a day.

The fracture of the interface section of the drain pipe that located behind the main steam regulating valve of steam turbine from one nuclear power plant caused the steam leakage. Based on the on-site drain pipe layout, the material, welding quality and vibration stress of the drain pipe were analyzed. Results show that, under the condition of low flow and small opening, the pressure wave excitation caused by turbulence leads to the fracture of the drain pipe, and the secondary stress of the drain pipe is large, which is close to the allowable stress of the material, leading to the fracture of drain pipe. The drain pipe vibration can be effectively reduced and the safety of the unit can be ensured through the adjustment of welding seam structure, drain pipe layout and supplementary construction of supporting structure.

The effects of the overfire air position on the combustion characteristics during the co-firing process of coal and semi-coke were studied numerically at a 2.4 MW swirl combustion furnace. Results show that, the overfire air position has a significant effect on the burning-out characteristics. The closer the overfire air is positioned to the downstream of the primary combustion zone, the longer residence time the fuels experience in the primary combustion zone and the shorter time in the overfire zone, which causes the inadequateness of reaction and worsens the burning-out of the remaining coke. Therefore, it is recommended that the overfire air position should be set as close as possible to the primary combustion zone with ensuring the nitrogen oxide (NO_x) emission meets the requirements in actual operation or retrofit. This method is beneficial to improve the burning-out characteristics of semi-coke.

To solve the problem of the leakage of the high pressure evaporator of a waste heat boiler in a gas-steam combined cycle unit, a comprehensive analysis was conducted on the failure mechanism and cause of the high pressure evaporator by means of macroscopic inspection and sampling analysis, while corresponding countermeasures were proposed. Results show that, the increase of the vaporization rate is resulted from the blockage by alien objects, and with the abnormal phase transition of the working medium occurring at the position of 1.5-5.2 m away from the high pressure evaporator header, the water content is decreased through the change of steam water mixture to saturated steam. The deposition and scaling in the inner wall of the high pressure evaporator is in process with the decrease of the dissolution of salt, which leads to the deposition corrosion. The leakage of the high pressure evaporator is finally caused by the reduction of the tube wall thickness.

In cold winter weather, the blades of wind turbines are susceptible to icing, which would seriously affect the efficiency of power generation and even cause the shutdown of wind turbine generator. To ensure the safe and efficient operation of wind turbine generators, the research progress of superhydrophobic coatings was reviewed, while the application advantages and existing problems of superhydrophobic coatings for anti-icing were summarized. Results show that, the anti-icing technology with superhydrophobic coatings for wind turbine generator blades has a promising application prospect. However, further researches should be carried out in the durability and engineering preparation of coatings.

For a 1 000 MW steam turbine generator unit during paralleling operation after maintenance, a detail introduction was conducted on the whole process of analysis and treatment for the abnormal increase of vibration amplitude with the increase of load. The reason of abnormal rotor vibration was analyzed from the aspects of the unit operation data, variable operation condition test, rotor inter-turn insulation diagnosis, and rotor sampling inspection, while combined with the unit maintenance, the rotor damping bar ventilation holes were offset and enlarged. Results show that, the severe thermal imbalance of rotor under high-load operation condition was caused by the damping bar runout with the blockage of some ventilation holes, which results in the abnormal rotor vibration. The adverse effect of the damping bar runout on the abnormal rotor vibration is completely eliminated through the offset and enlargement for the ventilation holes.