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    Research & Analysis
  • Research & Analysis
    Study on Adsorption Kinetics of HCl on the Surface of Ethanol-modified Calcium Adsorbent
    ZUO Shuai, CHANG Judong, LIU Meng
    2025, 39(2): 71-78. https://doi.org/10.19806/j.cnki.fdsb.2025.02.001
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Using ethanol hydration modified calcium oxide as the adsorbent, the influence of different modification parameters on the dechlorination effect was studied in a fixed bed experimental device, and analyses were conducted on the kinetics of HCl adsorption experimental results. Afrter which, the nonlinear fitting was carried out for the experimental data by five apparent kinetic models. Researches results show that, the order of fitting effect is Bangham model, quasi-second-order model, Elovich model, quasi-first-order model and particle internal diffusion model. The process of mass transfer and diffusion always has a significant influence on HCl adsorption, which is the key control step. In the initial stage of reaction, when the surface-active site is not occupied and the internal pore is not blocked, the external mass transfer process is the dominant control step. In the middle stage of reaction, because the original developed pore structure is blocked by the product layer, the diffusion resistance in the particles become the dominant factor in HCl adsorption process. Meanwhile, the chemical reaction in surface always plays a leading role in HCl adsorption process.
  • Research & Analysis
    Research on Adjustment Performance and Mechanical Property of Baffles with Two Types of Blades in Boiler Flue Gas Duct
    LIU Peng, REN Lingshen, YAN Xiao, CHEN Linqing, CHEN Jianling
    2025, 39(2): 79-84. https://doi.org/10.19806/j.cnki.fdsb.2025.02.002
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking two commonly used blades types of adjustment baffles in practical engineering as research examples, analyses with 3D modelling were conducted by applying finite element software. Comparisons were carried out between the resistance characteristics and adjustment performance of two types of adjustment baffles through flow field analysis; meanwhile, comparisons were carried out between the stresses and deformations of two types of adjustment baffles through mechanical property analysis. Results show that, the flat plate blade baffle has better adjustment performance than the streamlined blade baffle, while the streamlined blade baffle has better mechanical property performance than the flat plate blade baffle.
  • Research & Analysis
    Discussion on the Fundamental Period of Boiler Structural Support Steel in Large Power Plant
    ZHANG Yongqian, ZHANG Wenyuan, LIU Shuxin, SUN Hongpeng
    2025, 39(2): 85-89,125. https://doi.org/10.19806/j.cnki.fdsb.2025.02.003
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    According to the requirements of the American specification ASCE/SEI 7-22 for the fundamental period of structure, the fundamental period of boiler structural support steel was calculated by traditional approximate formula and structural analysis method based on STAAD.Pro software, and the fundamental periods of boiler structural support steel of different units were compared. Results show that, for the structural support steel of suspended boiler, the fundamental period calculated by the approximate formula method is shorter, and the fundamental period calculated by the STAAD.Pro software is longer than that obtained by the approximate formula. The fundamental period of boiler structural support steel is about 2 s for units with center support frame system, height of 70-100 m and capacity of 300-1 000 MW, which is similar to the calculation result of 1.4 times approximate formula. In the preliminary design stage, the 1.4 times approximate formula can be used to calculate the fundamental period for seismic design of large power plant boiler structural support steel. This method can not only ensure the safety and rationality of structural design, but also has good economic benefits.
  • Research & Analysis
    Analysis on Reliability of Single Point Signal for Thermal Control in a Thermal Power Unit
    ZHANG Lijin
    2025, 39(2): 90-94. https://doi.org/10.19806/j.cnki.fdsb.2025.02.004
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking the thermal control reliability check of a thermal power unit as an example, analyses were conducted on the reliability of single point signal in the protection and interlock of main and auxiliary engines in the unit, so as to identify the risk of equipment misoperation and refusal-operation, and corresponding improvement measures were put forward subsequently. Using case analysis method, the function of single point signal in protection, interlock, start-stop permit and so on was analysed by taking master fuel trip (MFT) signal and air preheater full stop MFT protection signal as examples. It is found that the single point signal not only has the problem of refusal-operation or misoperation in main engines protection, but also has similar problems of the protection and interlock of important auxiliary engines, which will lead to a serious impact on the safe operation of the unit. In view of the problems found, some suggestions were proposed to improve the reliability of single point signal logic, such as adding the same type of redundant single point signal to form redundant logic, adding different types of single point signals to form redundant logic, and cancelling or changing the limit of single point signal to start.
    • New Energy
  • New Energy
    Analysis of a Strong Robust Three-phase Inverter Control Strategy for Grid-connected Photovoltaic
    LI Yan
    2025, 39(2): 95-104. https://doi.org/10.19806/j.cnki.fdsb.2025.02.005
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Grid-connected inverter is the core of direct current (DC) and alternating current (AC) conversion, and its performance is directly related to the efficiency of grid-connected photovoltaic and the power quality of the power system. However, during the long-term service of the inverter, the instability factors such as DC voltage fluctuation and power grid disturbance put forward higher requirements for the control strategy of the inverter. The voltage and current closed-loop control mechanism and its equivalent model of three-phase inverter were analysed systematically, and the strong robust closed-loop control strategy was proposed by combining the proportional-integral-derivative (PID) controller and feedforward control idea. At the same time, based on the equivalent model and power consumption, the design of inductance and capacitance in the filter circuit was improved. Finally, a complete simulation circuit model was built by using MATLAB Simulink software, and the performance of closed-loop control circuit and the filtering effect of filter were analysed comprehensively. Results show that, the disturbance removal time of the control strategy does not exceed 0.02 s, and it has good synchronization between output voltage and current. The harmonic distortion rate of the output voltage and current of the inverter is less than 1%, and the power quality of the three-phase voltage and current is good.
    • Design & Manufacture
  • Design & Manufacture
    Finite Element Design of Wet Electrostatic Precipitator
    HE Wei
    2025, 39(2): 105-110. https://doi.org/10.19806/j.cnki.fdsb.2025.02.006
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The frame structure of the wet electrostatic precipitator (WESP) is equipped with a plate reinforcement structure on the outside to form a flue gas channel. When using finite element software for analysis, the setting of the plate reinforcement structure can fully consider the contribution of the plate to the overall structural stiffness, thereby achieving more reasonable design optimization. However, common finite element software does not provide specification verification for plates, so it is necessary to further verify the reliability of the calculation results. By comparing the results of theoretical static calculation and finite element software calculation, the design method of the WESP structure was discussed. Results show that, after making reasonable assumptions about the combined section, the static calculation results coincide with the finite element calculation results, which provides an effective supplement and verification for the application of finite element design.
  • Design & Manufacture
    Research on Intelligent Generation of Basic Load Table Based on STAAD.Pro and Tekla Softwares
    WANG Jing, LIN Yi, CHEN Jianling, DAI Rui, XU Na, ZENG Tao
    2025, 39(2): 111-114,125. https://doi.org/10.19806/j.cnki.fdsb.2025.02.007
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    With the increase of boiler capacity, the number of columns required also increases. This leads to an increase in the amount of data in the basic load table, which puts higher demands on work efficiency. By extracting the node support reaction force information from the Anl file generated by the post-processing of the steel structure model in the STAAD.Pro software, combining the relevant data of the Tekla software model, and setting the relevant parameters of the user interface (UI), an intelligent program was designed to generate the specified form basic load table efficiently and with high quality. Results show that, the program realizes the intelligent data conversion between STAAD.Pro and Tekla softwares, and significantly improves the efficiency and accuracy of basic load design in boiler steel structure design.
    • Material Technology
  • Material Technology
    Analysis on Fracture Failure of Main Pump Cooling System Flange Bolts in a Nuclear Power Plant
    FU Liangqian, TANG Bin, XU Qi, ZHAO Yuxiang, CHEN Le, CHEN Gaozhan
    2025, 39(2): 115-119. https://doi.org/10.19806/j.cnki.fdsb.2025.02.008
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    During the routine inspection of major maintenance in a nuclear power plant, it was discovered that the flange bolts of outer heat shield and inner sleeve of the main pump cooling system had fractured during operation. Macroscopic observation, chemical composition analysis, vickers hardness test, metallographic inspection, and energy spectrum analysis were conducted on the fractured flange bolts. The reasons of the fracture were analysed in combination with the operating environment of main pump flange bolts. Results show that, the failure mode of the bolts is low-cycle fatigue fracture. In normal operation, temperature cycle changes and mechanical constraints form the two necessary conditions for fatigue fracture failure of bolts. In order to ensure the reliable operation of the main pump cooling system in the nuclear power plant, it is recommended to shorten the inspection cycle of bolts from 5 years to 2-3 years.
    • Measurement Technology
  • Measurement Technology
    Development and Application of an Automatic Multi-point Data Measuring Device for Steam Turbine Grooves
    DONG Guangming, YU Dizhong
    2025, 39(2): 120-125. https://doi.org/10.19806/j.cnki.fdsb.2025.02.009
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    For the sliding gap between the diaphragm and the groove center caused by the deformation of the high and medium pressure cylinders body in steam turbines after a long period operation, a multi-point data measuring device that can measure data of the cylinder and the diaphragm-groove center under the full load condition with combined high and medium pressure cylinders was designed, and the measuring effect of the device was verified by field test. Actual application results show that the device can make the main shaft precisely stay at the ideal angular position, and accurately measure the gap data by laser detector head. Compared with the reference value, the average deviation is within 0.01 mm. By applying this device, the measure time is decreased effectively, the accuracy and success rate of one successful adjustment at the first time are improved, and the safety and economy of unit are improved.
    • Operation & Retrofit
  • Operation & Retrofit
    Analysis and Treatment on Vibration Fault of Axial-flow Induced Draft Fan with Adjustable Rotor Blade in a Thermal Power Unit Under Deep Peak Regulation Condition
    SONG Tongtong, HU Wei, SONG Yajun, ZHANG Wei, HAO Xiangzhong, LIU Shuangbai
    2025, 39(2): 126-131. https://doi.org/10.19806/j.cnki.fdsb.2025.02.010
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The flow rate and system resistance are not matched with the characteristics of the induced draft fans in thermal power units under low load condition for deep peak regulation, leading to the vibration of fans is more sensitive to external disturbance and its own state change. To solve the problem that the vibration exceeded the limit of an axial flow induced draft fan with adjustable rotor blade under low load condition, according to the vibration characteristics and the feedback effect of vibration treatment, it is investigated that following reasons existed, such as a larger vibration in power frequency caused by an unbalance effect on the impeller of the induced draft fan, a larger vibration in frequency doubling and a fluctuation of fan vibration with the change of operation condition caused by the insufficiency and asymmetry of support stiffness. The vibration of induced draft fan with different openings of rotor blade has been finally controlled within a reasonable level through decreasing the amount of unbalance by field dynamic balancing test, adding welding ribs, and increasing the support stiffness with secondary grouting reconstruction.
  • Operation & Retrofit
    Optimization of High-temperature Reheat Steam Piping Layout for an Ultra-supercritical Unit
    WANG Zijie, ZHANG Jian, LI Kai
    2025, 39(2): 132-135. https://doi.org/10.19806/j.cnki.fdsb.2025.02.011
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Based on the system modelling with AFT software, for the reheat steam piping with the traditional double-piping layout in an ultra-supercritical unit, researches were conducted on the temperature change of the two sides of left and right outlet pipes in the boiler header, and the influence on the steam temperature and pressure parameters of the two sides of left and right inlet pipes in steam turbine, while corresponding optimization schemes were proposed. Research results show that, the steam temperature deviation could not be controlled with the application of the traditional double-piping layout, while the steam temperature deviation of steam turbine two sides could be well controlled by the optimized double-piping layout with mixing temperature design, which is conductive to the safe and reliable operation of steam turbine.
  • Operation & Retrofit
    Analysis and Treatment of Shaft Vibration of Coaxial Drive Feed Water Pump Steam Turbine with Vorecon
    ZHANG Ze, ZHOU Bin, DONG Wei, ZHANG Peng, Lü Meng, WANG Tao, YANG Yuxing
    2025, 39(2): 136-140. https://doi.org/10.19806/j.cnki.fdsb.2025.02.012
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In view of the abnormal vibration phenomenon during commissioning of a coaxial drive feed water pump turbine equipped with Vorecon transmission equipment, the bearing vibration, start-up process parameters, dynamic and static friction fault mechanism and Vorecon lubricating oil pressure were analysed. Calculation and analysis results show that the abnormal vibration is caused by many factors, including the low load of shafting, dynamic and static friction and oil film instability. To solve these problems, a series of measures were taken, including increasing the shaft seal temperature, extending the warming-up running-in time, reducing the lubricating oil pressure, and shortening the operation time of the coaxial feed water pump. Results show that, compared with the first start-up of the unit, the amplitudes of bearing No.1, 2 and 3 and Vorecon input shaft decrease from 164.08, 283.92, 217.48, 110 μm to 19.90, 24.47, 22.15, 47 μm respectively, and the abnormal vibration phenomenon is eliminated. The vibration data of each bearing are normal under no-load, low-load and full-load operation conditions.