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    Fundamental Research
  • Fundamental Research
    Effects of Initial Conditions on Hydrogen-Air Turbulent Diffusion Combustion and NO Formation
    HUANG Zhangjun, TANG Zhifeng, HE Honghao, LI Pengfei, TIAN Hong
    2022, 42(8): 693-700. https://doi.org/10.19805/j.cnki.jcspe.2022.08.001
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    The effects of different initial conditions on hydrogen-air turbulent diffusion combustion process were studied by coupling the eddy dissipation concept (EDC) model considering finite rate reaction with the 13 species 34 steps H2-N2 reaction mechanism. Results show that the peak temperature on the central axis of the flame and the mass fraction of NO would increase with the rise of initial air temperature and initial fuel temperature. As the air inlet velocity increases, both the flame peak temperature and the mass fraction of NO increase. As the fuel inlet velocity increases, both the flame peak temperature and the mass fraction of NO decrease. Under different initial conditions, the formation reactions of NO are mainly composed of the elementary reactions R22, R31 and R32, while the consumption reactions of NO are mainly composed of the elementary reactions R20, R29 and R30.
  • Fundamental Research
    Research on Growth Characteristics of Calcium Carbonate Fouling When Water Film on the External Surface of Heat Exchange Tube Evaporates in the Air
    XU Junjie, ZHANG Lixin, ZHAO Yan, LIU Jin, ZHAO Shengxian, GAO Ming, CHEN Yongbao, LIU Jingnan
    2022, 42(8): 701-706. https://doi.org/10.19805/j.cnki.jcspe.2022.08.002
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    In order to study the growth characteristics of fouling on the external surface of heat exchange tubes, an experimental device was built to simulate the evaporation of water film on the external surface of heat exchange tubes in the air. The variation of fouling resistance was studied under different spray water mass concentrations and air water flow directions, and the morphology of fouling was analyzed by electron microscope. Results show that the fouling grows fastest under the cross flow mode. The air water flow direction has a great influence on the fouling resistance at low spray water mass concentration. With the increase of spray water mass concentration, the effect of air water flow direction on the growth of fouling decreases gradually. The crystal form of fouling is typical calcite, a small amount of fouling is in agglomerated state, while most fouling is in a scattered state, indicating that the growth of fouling is a superposition process of deposition and removal.
    • Power Equipment and System
  • Power Equipment and System
    Research on Hydrodynamic and Heat Absorption Characteristics of Panel Heating Surface of the 600 MW Supercritical CFB Boiler
    XIN Shengwei, NIU Tiantian, ZHANG Weiqiang, WANG Hu, YANG Dong, XIE Guowei, GU Congyang, DU Jiajun
    2022, 42(8): 707-714. https://doi.org/10.19805/j.cnki.jcspe.2022.08.003
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    Aiming at the problem that the thermal deviation characteristics of high temperature heating surface in high parameter circulating fluidized bed (CFB) boiler directly affect the safe operation, according to the mathematical model and heat absorption model of the complex flow network system established by the platen superheater in the furnace of supercritical CFB boiler, the characteristics of pressure drop, flow distribution, outlet steam temperature distribution, wall temperature distribution along the working medium flow direction and the heat absorption distribution were calculated and analyzed for the 600 MW supercritical CFB boiler under full load and 100 MW operating conditions.Results show that the flow deviations are 12.71% and 13.96% respectively, and the exit steam temperature deviations of the full screen are 33 K and 58.4 K in 600 MW and 100 MW loads, which are all within a safe range. The maximum outer wall temperature in 600 MW load is 616.5 ℃, which is within the allowable range of materials. The heat absorption distribution tends low near the side water wall and the furnace center line, and high at the middle of the heating surface.
  • Power Equipment and System
    Verification and Analysis of a New Drag Model Based on Bubbling Fluidized Bed
    LI Huijun, WANG Yeku, ZHANG Jiuyi
    2022, 42(8): 715-721. https://doi.org/10.19805/j.cnki.jcspe.2022.08.004
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    According to the characteristics of different drag models, suitable drag models were selected in different particle concentration ranges, and smooth functions were introduced at the boundary point of particle volume fraction to make it continuous. A new drag model was obtained, which was coupled with Euler-Euler two-fluid model,so as to numerical simulate the bubbling fluidized bed. Finally, the simulation results were compared with those of Gidaspow model and experimental values. Results show that when the apparent gas velocity is 0.46 m/s, the accuracy of time average bed pressure difference of the new drag model with the correction factor of 0.8 is about 3.1% higher than that of Gidaspow model. When the apparent gas velocity is 0.51 m/s, the accuracy of bed expansion rate of the new drag model with the correction factor of 0.9 is about 7.1% higher than that of Gidaspow model. When the apparent gas velocity is 0.46 m/s, the accuracy of time average particle volume fraction of the new drag model with the correction factor of 0.8 is about 15% higher than that of Gidaspow model.
  • Power Equipment and System
    Formation Mechanism and Loss Analysis of Secondary Flow in a 10 kW Radial Flow Turbine
    LI Peng, LI Qi, LI Guoneng, HAN Xu, HAN Zhonghe
    2022, 42(8): 722-730. https://doi.org/10.19805/j.cnki.jcspe.2022.08.005
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    In order to effectively improve and enhance the efficiency and performance of the radial flow turbine with organic working medium, the thermodynamic design and simulation calculation of the 10 kW radial flow turbine were carried out, the formation mechanism and manifestation of various vortex systems in the static cascade and the rotor impeller were analyzed, and the distribution of static pressure utilization coefficient in different sections of the static cascade and the total pressure distribution in the internal section of the rotor blade were given. Results show that there is a transverse flow from the pressure surface to the suction surface in the stator blade, horseshoe vortex and wake vortex exist in the leading edge and trailing edge respectively, but the passage vortex is not captured, and the pressure branch of horseshoe vortex reaches the suction surface at 1/2 chord length. The vortex system in the rotor blade is mainly composed of leading edge pressure vortex, passage vortex and leakage vortex. The vortex formed on the hub surface at the pressure side of the leading edge of the rotor intersects with the passage vortex developed at the end, which intensifies the flow loss here. The flow condition at the high section of 0.6-fold rotation cotyledons is the best. Due to the mutual mixing of leakage vortex and passage vortex at the rotor tip, the streamline distribution at the section near the blade tip is complicated.
  • Power Equipment and System
    Research of Thermal Performance Analysis Method for CPR1000 Steam Generator
    ZHAO Qingsen, CHEN Jie, XIA Peng, PENG Weidi, TIAN Fujun, YANG Jie
    2022, 42(8): 731-736. https://doi.org/10.19805/j.cnki.jcspe.2022.08.006
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    The continuous accumulation and deposition of corrosion products in the secondary side of steam generator (SG) heat transfer tubes will have a great impact on the safe and economic operation of nuclear power plants. Based on the heat transfer calculation model of steam generator, the thermal performance supervision and evaluation model for steam generator in a CPR1000 nuclear power plant was established combining with the matching margin of steam generator and steam turbine. And the actual operation data of the unit were analyzed, the corresponding treatment measures and suggestions were put forward. Results show that the model can predict the subsequent operation trend of the steam generator, so as to ensure the safety and economy of major key equipments of the nuclear power plant.
    • New Energy Resources and Energy Storage
  • New Energy Resources and Energy Storage
    Characteristic Modeling and Flow Rate Control Method of the Anode Tail Gas Circulation Intake System in SOFC
    XIONG Xingyu, XUE Zhenzhong, WU Xin, CHANG Yuwei
    2022, 42(8): 737-744. https://doi.org/10.19805/j.cnki.jcspe.2022.08.007
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    Based on the 20 kW solid oxide fuel cell (SOFC) power generation system, the emulation testbed of the anode tail gas circulation intake system was built to analyze the working characteristics of claw pump under different load conditions. The characteristic model of claw pump was established by support vector regression (SVR) method. For the anode tail gas circulation intake system, the effectiveness of the proposed flow rate control method based on model prediction was verified by experiments, and the comparison of this method with PID control method was conducted. Results show that according to the verification results of operation data, the characteristic model of claw pump based on SVR method has higher accuracy, and the flow rate prediction error is within -5% to 5%, which can meet the experimental requirements. Compared with PID control method, the proposed method can reduce the response time and overshoot of the system.
  • New Energy Resources and Energy Storage
    Research on Fatigue Suppression of Wind Turbine Yaw System Based on Genetic Fuzzy Control
    LI Zhongxin, WANG Dalong, ZHUANG Jiacai, LIU Zhiheng, YAO Qi, ZHOU Zhenbo
    2022, 42(8): 745-752. https://doi.org/10.19805/j.cnki.jcspe.2022.08.008
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    Aiming at the influence of the accumulated bearing damage of the wind turbine yaw system on its wind effect and service life, according to the mechanical structure and operation principle of the yaw system, two kinds of fatigue damage characterization parameters were introduced to guide the optimal controller design of the yaw system. Based on the empirical fuzzy yaw control strategy, the fuzzy rules were optimized by using genetic algorithm and yaw fatigue damage parameters, and the bearing fatigue load were effectively suppressed by yaw system during the wind process. The proposed control strategy was applied to carrying out multi-condition simulation experiments. Results show that compared with the existing control strategies,the proposed genetic fuzzy yaw control strategy significantly reduces the fatigue degree of the yaw system, and effectively decreases its damage.
  • New Energy Resources and Energy Storage
    Analysis of Dynamic Response and Structural Damage of Large-scale Wind Turbine Under Combined Action of Wind-Wave-Earthquake with Gravity Load
    LI Zhihao, YAN Yangtian, LI Chun, YUE Minnan, XUE Shicheng
    2022, 42(8): 753-761. https://doi.org/10.19805/j.cnki.jcspe.2022.08.009
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    Taking the offshore DTU 10 MW monopile wind turbine as the research object, Kaimal wind spectrum model was used to simulate the turbulent wind field, and the wave model was established according to P-M spectrum. The measured seismic displacement data was selected as the seismic load, and the soil-structure coupling effect model was established based on the nonlinear spring element and p-y curve. The dynamic response and buckling analysis of the wind turbine under different environmental loads were carried out. Results show that wind-wave and earthquake load are the main loads that cause the front and rear displacement and lateral displacement of the wind turbine tower, respectively. The first order mode of the tower is the main participating mode of wind dynamic mechanical response under different environmental loads. The top of the tower is prone to local buckling under combined action of environmental loads, which should be paid more attention to in the structural design. The combined effects of wind-wave-earthquake and gravity loads must be considered, otherwise it is difficult to accurately predict the dynamic response of wind turbine structures and judge the structural stability.
  • New Energy Resources and Energy Storage
    Progress and Development Prospects of Wide-power Photovoltaic Off-grid Hydrogen Production Technology in Northwest China
    LIU Chuanliang, GUO Wangui, KONG Xinxuan, ZHANG Hua, LI Zhenya, GUO Jiajing, BIAN Wenjie
    2022, 42(8): 762-768. https://doi.org/10.19805/j.cnki.jcspe.2022.08.010
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    Photovoltaic-coupled hydrogen production technology can use the waste and abandoned electricity generated by photovoltaics to produce hydrogen on a large scale, which reduces the hydrogen production cost, improves the overall system efficiency, and plays an important role in the transformation and upgrading of photovoltaic systems. By analyzing the development status of domestic photovoltaic coupled hydrogen production technology, its operation performance and system economy were evaluated. Finally, according to the characteristics of Northwest China, a technical route suitable for photovoltaic coupled hydrogen production technology demonstration was proposed.
    • Digitalization and Intelligentization
  • Digitalization and Intelligentization
    Modeling and Simulation of a Gas Turbine Based on Parallel Intelligent Fusion Algorithm
    ZHENG Feifan, WANG Xu, XU Ye, LI Wei, BAO Zhe
    2022, 42(8): 769-776. https://doi.org/10.19805/j.cnki.jcspe.2022.08.011
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    In order to better realize the combination advantage of mechanism model and intelligent prediction model, on the basis of three single models (i.e., mechanism, BP neural network and stepwise cluster models), three types of hybrid parallel intelligent fusion models composed of mechanism model and intelligent prediction model were firstly established by weight-optimization method, BP neural network fusion algorithm and multimode dynamic weight allocation method, respectively. Taking the gas turbine of a steel plant in Liaoning Province as the research object, the simulation effects of three intelligent fusion models and three single models were compared and analyzed. Results show that the accuracy of the intelligent fusion models is higher, and the root mean square errors were within 1%. When the amount of training data is large, among three intelligent fusion models, the weight-optimization method has the higher precision than other two models, its coefficient of determination is higher than 0.97 and the average error is 0.51%. The successful application of the fusion algorithm in the gas turbine simulation was capable of providing good technical support for improving the prediction accuracy of simulation model and estimating the performance of the gas turbine under variable working conditions.
    • Green Energy and Low-carbon Technology
  • Green Energy and Low-carbon Technology
    Absorption Performance of Caustic Solution for CO2 Capture from Simulated Flue Gas in Coal-fired Power Plant
    WANG Liang, LIU Fei, LI Chenxi, QI Zhifu, WENG Jianming, YANG Rui, LIU Yu, SHEN Zhen
    2022, 42(8): 777-783. https://doi.org/10.19805/j.cnki.jcspe.2022.08.012
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    Effect of absorbent inlet temperature, equivalence ratio, residence time, concentration of NaOH solution on CO2 capture in a random packed absorber reactor was studied by single-factor experiments, and these parameters were optimized using orthogonal test. Results show that under the experimental conditions, the effects on CO2 capture is in a descending sequence as inlet temperature,residence time,equivalence ratio and concentration. Both inlet temperature and residence time of NaOH solution have obvious influence on CO2 capture while minor effect of equivalence ratio and concentration exist. The optimum conditions are achieved at inlet temperature of 40 ℃, residence time of 5 s, equivalence ratio of 100%, and NaOH concentration of 2.0 mol/L.
  • Green Energy and Low-carbon Technology
    Study on Synergistic Effect of H2O and SO2 During Carbonation on CO2 Capture in Calcium Looping Cycle
    DAI Wenhao, WANG Chunbo, CHEN Liang, FANG Yuan, YUAN Feng, YAN Guangjing
    2022, 42(8): 784-792. https://doi.org/10.19805/j.cnki.jcspe.2022.08.013
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    Synergistic effect of H2O and SO2 on the cyclic capture of CO2 was studied by a homemade thermostatic thermogravimetric system, and combined with the pore size of the absorbent, the mechanism analysis was carried out.Results show that H2O in the carbonation atmosphere can accelerate the reaction rate of the fast reaction stage of carbonation, and improve the pore structure of CaO particle and the conversion rate of carbonation. SO2 in the carbonation atmosphere can hinder CO2 capture and reduce the conversion rate of carbonation, and the conversion rate decreases more obviously in the cycle process. When H2O and SO2 act synergically in the carbonation process, the calcium cycling characteristics may be affected by the synergistic effect of H2O and SO2. When H2O volume fraction increases from 0% to 20% with 0.05% volume fraction of SO2, the absorbent pore volume gradually increases and CO2 capture capacity can be improved.With the addition of 10% volume fraction of H2O, when the volume fraction of SO2 increases from 0% to 0.1%, the pore clogging of absorbent becomes more serious and CO2 capture capacity decreases. However, the carbonation conversion rate still remain a higher value than that without H2O. Synergistic effect of H2O and SO2 mainly reflects in that H2O could weaken the hindering effect of SO2 on CO2 capture, thereby improving the carbonation conversion rate of absorbent.