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    Summary & Survey
  • Summary & Survey
    Introduction on Key Technologies of Large-capacity Megawatt-class Hydrogen Internal Combustion Engine for Power Generation
    Jiang Qian
    2023, 37(5): 277-282,292. https://doi.org/10.19806/j.cnki.fdsb.2023.05.001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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 (NOx) emission can be reduced with the application of a mature exhaust gas after-treatment technology by ammonia (NH3)-selective catalytic reduction (SCR).
  • Summary & Survey
    Orientation and Development of Compressed Air Energy Storage
    Wu Bin, Li Rui, Li Ji, Zhu Xuecheng, Ling Chen
    2023, 37(5): 283-286. https://doi.org/10.19806/j.cnki.fdsb.2023.05.002
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
  • Summary & Survey
    Review on Fault Detection Methods for Generator Stator Core
    Lu Yi, Jin Sen
    2023, 37(5): 287-292. https://doi.org/10.19806/j.cnki.fdsb.2023.05.003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
    • Research & Analysis
  • Research & Analysis
    Feasibility Analysis on Application of New Nanofluid Coolant in Wind Turbine Generator Set Cooling System
    Luo Yi, Xin Sha, He Yan
    2023, 37(5): 293-297. https://doi.org/10.19806/j.cnki.fdsb.2023.05.004
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
  • Research & Analysis
    Economic Analysis of a 330 MW Coal-fired Boiler Coupled with ORC Power Generation System
    Gao Jianqiang, Yan Yicong, Li Xinhui, Zhang Hao, Ling Haitao
    2023, 37(5): 298-301. https://doi.org/10.19806/j.cnki.fdsb.2023.05.005
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
  • Research & Analysis
    Research on Thermal Economy of Extraction Steam Heating Mode Through Reheat Section in Thermal Power Units
    Hao Fei, Yang Wenzheng
    2023, 37(5): 302-304,316. https://doi.org/10.19806/j.cnki.fdsb.2023.05.006
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
  • Research & Analysis
    Test on Performance of a 50 MW Steam Turbine with Steam Supplement for Waste Heat Utilization
    Yao Ji
    2023, 37(5): 305-309. https://doi.org/10.19806/j.cnki.fdsb.2023.05.007
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
    • Material Technology
  • Material Technology
    Discussion on Material Selection of High-temperature Components for 650 ℃ Advanced Ultra-supercritical Boilers
    Jing Shiyu, He Xiaoming, Zhang Wei, Xie Xiaoyuan, Wang Linsen, Zeng Hui, Yang Huachun
    2023, 37(5): 310-316. https://doi.org/10.19806/j.cnki.fdsb.2023.05.008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
    • Nuclear Technology
  • Nuclear Technology
    Comparison on Eddy Current Testing Methods for U-shaped Heat Transfer Tubes of High and Low Pressure Heaters in Nuclear Power Units
    Chen Xiaofei
    2023, 37(5): 317-322. https://doi.org/10.19806/j.cnki.fdsb.2023.05.009
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
    • Automatic Control
  • Automatic Control
    Application of CO-O2 Control Technology in a 660 MW Ultra Supercritical Unit
    Chen Yongcheng
    2023, 37(5): 323-327,333. https://doi.org/10.19806/j.cnki.fdsb.2023.05.010
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
  • Automatic Control
    Design and Application of Control Logic for Steam Injection Vacuum System in Thermal Power Unit
    Fu Ledong
    2023, 37(5): 328-333. https://doi.org/10.19806/j.cnki.fdsb.2023.05.011
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
    • Operation & Retrofit
  • Operation & Retrofit
    Analysis and Treatment of Abnormal Cases in Gas-Steam Combined Cycle Unit After Warm-up Load Optimization
    Du Wenjie
    2023, 37(5): 334-338,342. https://doi.org/10.19806/j.cnki.fdsb.2023.05.012
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.
  • Operation & Retrofit
    Retrofit on the Burner Nozzle of Gas Turbine with Lower Calorific Value Synthesis Gas in IGCC Unit
    Zhang Jianfu
    2023, 37(5): 339-342. https://doi.org/10.19806/j.cnki.fdsb.2023.05.013
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    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.