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  • Research & Analysis
    Dynamic Modelling and Simulation of Combustion Mode Switching Process in Gas Turbine
    SHEN Xinjun, LIU Yongwen, ZHANG Xuan, LI Junkun, WANG Fuzhong, ZHAO Yu
    2025, 39(1): 1-6. https://doi.org/10.19806/j.cnki.fdsb.2025.01.001
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    To meet the requirements of increasingly stringent standards for nitrogen oxides (NOx) emission, the lean-premixed combustion mode is widely applied in heavy-duty gas turbines for power generation. With the application of this technology, the flame temperature can be reduced, so as to decrease the NOx emission. To verify the combustion mode control system in an F-class heavy-duty gas turbine, based on the mechanism model of simplified chemical reaction for natural gas combustion, a network module library for chemical reactor was established, and a simulation research was conducted on the switching process of combustion mode. Based on the modelling technology of Simulink model diagram, a dynamic modelling for the dramatic changing process such as ignition and burn out is realized. Through simulating, it is verified that the established model can accurately reflect the influence of flow distribution ratios of different fuel nozzles on the combustion temperature and emission component, while the real-time simulation with a lower computational expense for combustion mode switching can be realized.
  • Research & Analysis
    Analysis on the Influence of Heat Exchangers in Adiabatic Compressed Air Energy Storage System
    ZHANG Rongfa, HAO Ning, LIU Chuanliang, YANG Bobin, LIU Jia, ZHANG Tianbo
    2025, 39(1): 7-13. https://doi.org/10.19806/j.cnki.fdsb.2025.01.002
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    Adiabatic compressed air energy storage system has the characteristics of large capacity, long-term performance, safety, stability, and flexibility. In this type of energy storage system, the heat exchangers, as key components, have particularly important impact on system efficiency. Therefore, by establishing an adiabatic compressed air energy storage thermal system model, the impact of heat exchanger final temperature difference and air side pressure drop on system efficiency was analysed, and the cost of heat exchangers was comprehensively evaluated. Results show that, the increase of the upper final temperature difference of heat exchangers can lead to a decrease in system efficiency, and the lower final temperature difference should be matched with the upper final temperature difference in practical engineering design. Compared to high-pressure heat exchangers, the air side pressure drop of low-pressure heat exchangers has a greater impact on system efficiency. The smaller the final temperature difference and pressure drop of the heat exchangers, the higher the system efficiency, but the higher the equipment cost. Therefore, there is an optimal combination of final temperature difference and pressure drop to minimize the cost of the heat exchangers while meeting the system efficiency requirements.
  • Research & Analysis
    Safety and Economic Analysis of Sludge Mixed Combustion in a 1 000 MW Coal-fired Boiler
    LU Jian, ZHAO Dongjian
    2025, 39(1): 14-18. https://doi.org/10.19806/j.cnki.fdsb.2025.01.003
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    A 1000 MW coal-fired boiler experienced a decrease in efficiency due to the long-term mixed combustion of sludge and lignite. During boiler inspections, slagging was found on the water walls near the burners and the first-stage superheater tube panels. To improve the boiler efficiency and solve the problem of slagging, the combustion characteristic test of common coal and sludge was carried out, and the combustion condition in the furnace was optimized by combining the pulverization system and combustion adjustment test. Results show that, the optimized combustion condition can effectively realize the combustion of "wind-wrapped powder" in the furnace, and successfully eliminate the slagging problem in the water wall area and first-stage superheater tube panels. Furthermore, for the 1 000 MW coal-fired boiler under various load conditions, a sludge mixed combustion strategy based on secondary air distribution and excess air coefficient control was proposed to further improve boiler efficiency.
    • New Energy
  • New Energy
    Application of Low Cost Status Monitoring Method Based on Photovoltaic Power Generation Model
    LEI Ding, GENG Xuning, JIN Zhonghao, TANG Bin
    2025, 39(1): 19-22. https://doi.org/10.19806/j.cnki.fdsb.2025.01.004
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    A photovoltaic power generation model was reasonably established through comparing with several monitoring methods, and comparisons were conducted between the photovoltaic power generation per unit area of actual equipment and model, so as to verify whether the established photovoltaic power generation model can realize the status monitoring of photovoltaic power generation equipment with low cost. The abnormal photovoltaic power generation equipment is visually detected from the status monitoring results in the first practical application. Following problems have been solved during analysing and treatment process, such as the string fault caused by hot spots, power limitation caused by unreasonable string connection, and abnormal fluctuation caused by condensation cloud covering. Finally, it is confirmed that this method could indeed be implemented with low cost and demonstrate a certain level of effectiveness.
    • Material Technology
  • Material Technology
    Research on Precipitates Along Grain Boundary of HT700T Alloy Tubes
    HE Xiaoming, JING Shiyu, ZENG Hui, YANG Jian
    2025, 39(1): 23-28. https://doi.org/10.19806/j.cnki.fdsb.2025.01.005
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    By using optical microscopy (OM), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), and multi-phase separation technology, a research was conducted on the precipitates along grain boundary of HT700T alloy tubes after thermal exposure. Results show that, the precipitates along grain boundary under etching condition appear as flocculent clusters, which are significantly different from precipitates within grain. The precipitates along grain boundary has already appeared after thermal exposure at 500 ℃, while the quantity of precipitates increases with an increase of temperature, reaching a peak value at around 750 ℃, and then gradually decreases until completely dissolving and disappearing at 1 000 ℃. The precipitates along grain boundary are composed of Cr-rich phase, γ' phase, and γ matrix phase, and the volume fraction of γ' phase in grain boundary micro region is higher than that within grain. Through observing different regions in the creep rupture specimen at a high temperature of 700 ℃, no evidence has been found that the precipitates along grain boundary promote the creep cracking of sample, but the stress has a certain effect on promoting the precipitation along grain boundary.
  • Material Technology
    Research on Welding Procedure of Q420NE Steel for Door Frame of Wind Power Tower Barrel
    LIU Ke, XIONG Wei, GONG Min
    2025, 39(1): 29-34. https://doi.org/10.19806/j.cnki.fdsb.2025.01.006
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    For a wind power tower barrel manufacturing project, a research was conducted on the flux-cored arc welding with CO2 gas shielding (FCAW) process of Q420NE thick plate butt joint for door frame of wind power tower barrel, and the Q420NE thick plate welding procedure was evaluated. Additionally, through solid wire control group experiments, the influence of different shielding gases on the solid wire gas shieled welding was analysed. Results show that, the FCAW process meets the welding procedure requirements for Q420NE thick plate and can be used for the tower barrel door frame welding. For solid wire gas shielded welding, the type of shielding gas has a significant impact on the welding of Q420NE steel, and welding Q420NE steel with pure CO2 gas cannot ensure that the weld meets the technical requirements.
  • Material Technology
    Analysis on Tube Burst of High Temperature Superheater in a Power Plant Boiler
    SONG Libin
    2025, 39(1): 35-39. https://doi.org/10.19806/j.cnki.fdsb.2025.01.007
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    For a tube burst accident occurred at a high temperature superheater in a power plant boiler, to avoid the similar accidents, the reason of tube burst was investigated from the aspects of macroscopic inspection, alloy composition analysis, hardness test, metallographic inspection, and energy spectrum analysis through using alloy analyzer, Brinell hardness tester, metallographic microscope, and scanning electron microscope (SEM). Results show that, the reason of the tube burst is the thick corrosion products attached to the inner wall of the tube, which leads to the decrease of flow area and the deterioration of heat transfer with the long time over temperature service of boiler tube. In response to this issue, it is necessary to strengthen the management of the construction and installation process of boiler heating surface tubes in power plants. Measures such as sealing the tube leak and strengthening the wall temperature monitoring during operation should be adopted, thereby improving the reliability of boiler operation.
    • Operation & Retrofit
  • Operation & Retrofit
    Cause Analysis and Measures of Tripping During ATT of a 1 000 MW Ultra-supercritical Double Reheat Unit
    CHEN Xin
    2025, 39(1): 40-44. https://doi.org/10.19806/j.cnki.fdsb.2025.01.008
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    A 1 000 MW ultra-supercritical double reheat unit experienced an abnormal drop in control (EH) oil pressure during a valve activity test (ATT), which led to the closure of all turbine control valves, triggering the generator reverse power protection and causing the unit to trip. The causes of the accident were analysed, and the treatment suggestions and subsequent preventive measures were put forward based on the working principle of the oil motor and the control valve anti-jamming logic in the logic of the digital electrohydraulic control system (DEH). Results show that, by strictly controlling the quality of EH oil, optimizing the test process, and enhancing the inspection of logic configurations, the turbine trip caused by ATT can be effectively avoided. The research results have a certain reference significance for the commissioning and operation of similar types of units.
    • Special Column: Steel Structure Design for Power Plant Boilers
  • Special Column: Steel Structure Design for Power Plant Boilers
    Seismic Performance Research on the Combination of Boiler Steel Frame and Front Coal Bunker in a Large Power Plant
    ZHONG Lei, LIU Shuxin, ZHANG Yongqian, TAN Shasha, YUAN Yi, XIU Deshuai
    2025, 39(1): 45-53. https://doi.org/10.19806/j.cnki.fdsb.2025.01.009
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    For the combination of boiler steel frame and front coal bunker in a large power plant, the seismic performance under frequent and rare earthquake conditions was researched by using ABAQUS finite element software, and analyses were conducted on the seismic time-history response and the influence of beam-column connection type on the seismic performance of the structure system. Subsequently, the torsional deformation of structure with beam-column pinned connection under rare earthquake condition was quantitatively evaluated based on torsional angle, and corresponding measures were proposed to reduce the torsional deformation. Research results show that, the overall stiffness of structure would be influenced by the beam-column connection types, and the application of a structural system with beam-column pinned connection may result in lower overall stiffness, leading to increased structural deformation. Both articulated structures with additional reasonable braces and rigidly connected structures demonstrate good seismic performance, while articulated structures are more economical.
  • Special Column: Steel Structure Design for Power Plant Boilers
    Research of Optimal Design for Large Power Plant Boiler Steel Structure Based on High-strength Steel
    CHEN Jianling, GAO Ling, XIU Deshuai
    2025, 39(1): 54-58,70. https://doi.org/10.19806/j.cnki.fdsb.2025.01.010
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    High-strength structural steel (referred to as high-strength steel) Q460 was selected to optimize the most frequently used H-shaped section bending members and box-shaped section axially loaded members in large boiler steel structure. Results show that, the application of high-strength steel in large power plant boiler steel structure has significant economic benefits. For large plate-bent bending members, the optimal design using high-strength steel Q460 can save 32.5% of the steel quantity. For axially loaded members, the proportion of steel quantity saved decreases with the increase of slenderness ratio and thickness, but the maximum saving ratio can reach 21.7%.
  • Special Column: Steel Structure Design for Power Plant Boilers
    Structure Design of a New Type of SCR Reactor for Coal-fired Power Plants
    MA Tianqing, MA Hongbu, LI Chunyu, JIANG Hongwen
    2025, 39(1): 59-64. https://doi.org/10.19806/j.cnki.fdsb.2025.01.011
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    At present, selective catalytic reduction (SCR) is widely used for flue gas denitration in coal-fired power plants. SCR reactor is the main equipment for flue gas denitration treatment, and its design scheme directly affects the flue gas denitration performance. The SCR reactor is subjected to various loads and effects during operation, and the conventional design usually adopts a conservative frame form, which has limitations in material utilization and stress performance. In order to achieve high-performance design of SCR reactor structure, the stress characteristics and structural scheme were studied, and the key technical solutions such as structural spatial layout and section optimization, structural stiffness improvement, thermal stress and expansion deformation control, internal pressure control, and ash deposition prevention measures were formed. A new type of SCR reactor structure was designed. Results show that, the new type of SCR reactor structure is reasonably arranged, the height of the catalyst layer beam can be reduced by about 50%, and the total steel consumption can be saved by about 20%. At the same time, finite element simulation analysis shows that the structure has good stress performance and safety performance. The new type of SCR reactor has been applied in many projects, effectively controlling the nitrogen oxides (NOx) emission from power plants and generating significant benefits.
  • Special Column: Steel Structure Design for Power Plant Boilers
    Design for Refuse-fired Boiler Plant with Tight Sealing Steel Structure
    XU Mingdi
    2025, 39(1): 65-70. https://doi.org/10.19806/j.cnki.fdsb.2025.01.012
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    For the boiler plant in a refuse-fired power generation unit, design methods and cautions were introduced and analysed for the application of tight sealing steel structure, while comparisons were carried out with other types of boiler plants in terms of site area and total height of building. Results show that, the design of boiler plant with tight sealing steel structure can protect the maintenance platform from wind and rain with a heat insulation effect, and there is no need to build a separate building envelope, resulting in a smaller site area, less material consumption, and a lower overall construction cost.