Current issue

  • Select all
    |
    Fundamental Research
  • Fundamental Research
    Acoustic Propagation Characteristics in High-pressure Subcooled Boiling Water
    JIANG Yu, JIANG Genshan, SUN Jianhao, ZHOU Zishu, LIU Yuechao
    2025, 45(11): 1757-1766. https://doi.org/10.19805/j.cnki.jcspe.2025.240564
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To improve the accuracy of acoustic detection of leaks in heat-exchange pipes in nuclear power plant steam generators, the characteristics of sound propagation in high-pressure subcooled boiling water were studied. It was assumed that all bubbles have the same radius and that the number of bubbles per unit volume is the same in high-pressure subcooled boiling water, so as to calculate the anechoic cross-section of a single bubble. Meanwhile, for the subcooled boiling zone of the steam generator, the effects of acoustic frequency, bubble volume fraction, bubble radius, and temperature on the sound speed and attenuation coefficient were investigated at a high pressure of 6.89 MPa. Results show that the sound speed and attenuation coefficient increase at first and then decrease with an increase the frequency of incident wave. The bubble volume fraction is a key factor in determining sound speed in subcooled boiling water at high pressure, and the presence of bubbles can significantly reduce the sound speed, even causing it to fall below the sound speed in saturated vapor. Under high-temperature and high-pressure conditions, the attenuation coefficient positively correlates with the acoustic wave frequency, bubble volume fraction, and bubble radius. When the volume fraction of bubbles is constant, the attenuation coefficient is increased by about 2 times as the temperature rises from 255 ℃ to 284 ℃.
    • Power Equipment and System
  • Power Equipment and System
    Calculation and Analysis for the Safety of High-temperature Heating Surface of a 700 MW Ultra-supercritical CFB Boiler Without an External Bed After Plant Operation Total Power Failure
    WANG Aoyu, LU Jiayi, ZHOU Xu, DENG Qigang, Lü Zhuo, SHI You, YANG Dong
    2025, 45(11): 1767-1776. https://doi.org/10.19805/j.cnki.jcspe.2025.240532
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a 700 MW ultra-supercritical circulating fluidized bed (CFB) boiler without an external fluidized bed as the research object, the temperature variations across heating surfaces in the furnace and the rear flue gas pass were analyzed and calculated. A flow and heat transfer model for heating surfaces after a power failure accident was established, while the heat load calculation model for each heating surface was optimized. Based on above researches, a computational program for transient heat transfer in heating surfaces of boiler after a power failure accident was developed. Through computational analysis, the variations of thermal parameters such as working fluid temperature and tube wall temperature in each heating surface after power failure, were obtained. Without an emergency supplementing water water pump, only the high-temperature reheater experienced a transient overtemperature, while the overtemperature exhibited a minimal magnitude and a short duration, posing no safety risks to heating surfaces. Considering the high construction costs of emergency supplementing water pump and comprehensive economic evaluations, this CFB boiler does not require an installation of emergency supplementing water pump.
  • Power Equipment and System
    A Multi-dimensional Hybrid Modelling Method for Pulverized Coal Boiler Secondary Air Accurate Description and Air Distribution Numerical Simulation Research
    CAO Yuanhao, CHEN Xi, ZHOU Guanwen, SHI Jianliang, HUANG Guoshun
    2025, 45(11): 1777-1786. https://doi.org/10.19805/j.cnki.jcspe.2025.240558
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Computational fluid dynamics (CFD) numerical simulation has been widely applied in boiler design and operation optimization. However, in simulation process, the secondary air is often simplified as a velocity boundary condition, which makes it difficult to reflect the non-linear adjustment effect of damper opening on air velocity and the mutual influence among dampers during the actual operation of boiler. In response to above problems, a coupled numerical simulation method based on multi-dimensional modelling was proposed, by establishing a three-dimensional mathematical model for boiler furnace and a one-dimensional model for boiler secondary air system, while coupling the pressure and velocity in air dampers. Numerical simulation and validation were conducted on a 330 MW tangentially fired coal-fired boiler using this method, and the combustion characteristics of boiler under four air distribution conditions, including uniform, positive pagoda-shaped, inverted pagoda-shaped, and waist-shrinking, were analyzed. Results show that the model can accurately reflect the impact of secondary air damper opening change on combustion. In the burner zone, the temperature is relatively higher under positive pagoda-shaped air distribution, while it is lower under inverted pagoda-shaped air distribution. The temperature distributions in furnace under uniform and waist-shrinking air distribution are similar and relatively uniform. The CO mole fraction is relatively low under positive pagoda-shaped air distribution, while it is comparatively higher under inverted pagoda-shaped air distribution. In contrast, the CO mole fraction distributions are relatively uniform under both uniform and waist-shrinking air distributions.
  • Power Equipment and System
    Experimental Study on Emission Characteristics of W-flame Pulverized Coal Boiler Under Multi-sound Source Excitation
    YANG Yanfeng, MA Jiwei, LIU Liang, YANG Yang, LIANG Jianguo
    2025, 45(11): 1787-1794. https://doi.org/10.19805/j.cnki.jcspe.2025.240508
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To investigate the emission characteristics of a W-flame pulverized coal boiler under multi-sound source excitation, an experimental study on the combustion influence of acoustic waves was conducted on a W-flame pulverized coal boiler with its unit load stabilized at 265 MW (with a rated load of 350 MW). Twelve and four acoustic excitation devices were arranged respectively in the primary combustion zone and the burnout zone of the boiler. Above devices were operated in cyclic groups with each individual motor operating at a frequency of 35 Hz, and the inlet air pressure was controlled within the range of 0.35 to 0.47 MPa. Results show that, compared with the operation condition without acoustic excitation device, the SOx mass concentration in the inlet flue gas of desulfurization device is decreased by 0.2%, while the NOx mass concentrations at A and B side inlets of denitration tower were increased by approximately 29.65 and 22.31 mg/m3, respectively. Additionally, the boiler thermal efficiency is improved by 0.53 percentage points, and the carbon content (mass fraction) of fly ash is decreased by 1.55 percentage points. By adding an acoustic field within the furnace, the combustion intensity of pulverized coal can be enhanced and the thermal efficiency of boiler can be improved.
  • Power Equipment and System
    Research on Low-temperature Corrosion of Common Heating Surface Materials in Boiler Caused by Combustion of Coal Mixed with Biomass
    YI Jinhao, LIU Hu, LIANG Hongli, MAO Junhua, XUE Jinbiao, XIAO Yangyang, CHE Defu
    2025, 45(11): 1795-1802. https://doi.org/10.19805/j.cnki.jcspe.2025.240562
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking NH4Cl as an example, an improved simulated flue gas corrosion device was used to study the corrosion characteristics of common low-temperature heating surface materials in boiler caused by coal-mixed biomass combustion. Results show that TA2 has strong corrosion resistance to both NH4Cl and H2SO4, and no corrosion occurs within the temperature range of the experiment. 316L is more susceptible to corrosion by sulfuric acid at high temperature than NH4Cl, while ND steel and Corten steel have similar corrosion resistance. When the flue gas temperature is 100-150 ℃, the main cause of corrosion is the corrosion of metals by the sulfuric acid solution formed by the condensation of sulfuric acid and water vapor, NH4Cl has the effect of absorbing water vapor and sulfuric acid. When the flue gas temperature is below 90 ℃, the influence of chlorine on corrosion is greater with the decrease of temperature.
  • Power Equipment and System
    Effect of Pin Fins and Ribs on the Aerothermal Characteristics for the Trailing Edge Cutback Channel of the Turbine Blade
    YANG Kefeng, GAO Shanghong, WANG Xiangyu, LIU Zhao, FENG Zhenping
    2025, 45(11): 1803-1814. https://doi.org/10.19805/j.cnki.jcspe.2025.240538
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In order to study the aerothermal characteristics of trailing edge cooling structure of the turbine blade, a L-shaped wedge channel model with trailing edge cutback of the blade was established. The effects of the pin fins, ribs and their arrangement on the flow and heat transfer characteristics were numerically analyzed and compared, and it was proposed to use both the thermal uniformity index and the thermal performance index to evaluate the heat transfer efficiency of the channel. Results show that there are two separated vortices in the smooth channel. The pin fins and ribs have a significant restraining effect on these two vortices, which can significantly improve the heat transfer performance of the channel. When comparing the heat transfer characteristics of different channels using the thermal performance index, the channel with pin fins has the best heat transfer efficiency. However, when the uniformity of heat transfer distribution is considered, the channel with both ribs and pin fins has the best heat transfer efficiency. The arrangement of two types of turbulator structures has a limited effect on the thermal performance index, but has a significant effect on the uniformity of Nusselt number distribution. The comprehensive coefficients of the ribs and pin fins are higher in the staggered arrangement, which are 5.23% and 2.71% higher than that in the inline arrangement, respectively. Thus, it is recommended to use the staggered arrangement of the ribs and pin fins in the cooling design of the trailing edge cutback of the turbine blade.
  • Power Equipment and System
    Research on High-precision Gas Radiation Characteristics Model and Its Application in Gas Turbine Combustor Chamber
    LI Jialu, WANG Chaojun, GENG Junjie, HE Boshu, QI Haiying, WANG Cuiping
    2025, 45(11): 1815-1823. https://doi.org/10.19805/j.cnki.jcspe.2025.240591
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To improve the simulation accuracy of low pollution combustion process of gas fuel in the combustion chamber, the weighted sum of grey gases (WSGG) model and full spectrum k-distribution (FSK) model were added to commercial software through user-defined programs, and applied to the numerical simulation of combustion process in 5 and 110 MW full-parameter and full-scale natural gas combustion chambers. Results show that the radiation model built into commercial software has insufficient accuracy, while the FSK model can accurately characterize the generation of NOx in the combustion chamber and the radiation heat flux of gas on the flame tube wall. The improved WSGG model has achieved segmented approximation of the precise absorption coefficient curve, improving the accuracy of the model. However, there are still doubts about its performance in terms of radiative heat transfer between gas and combustion chamber wall, and further research is needed.
  • Power Equipment and System
    Numerical Simulation of Heat Transfer Characteristics in Jet-based Cooling Channel for the First Wall of Nuclear Fusion
    WANG Yinan, ZENG Tianbao, ZHENG Zhiying, CAI Weihua, LI Fengchen
    2025, 45(11): 1824-1832. https://doi.org/10.19805/j.cnki.jcspe.2025.240567
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    A new type of internal cooling channel for the first wall of nuclear fusion based on jet flow was designed. The effects of operating and structural parameters on the flow and heat transfer characteristics of the jet cooling channel were preliminarily explored. The heat transfer characteristics of the jet cooling channel were compared with the prototype straight channel under the same operating parameters. The cooling performance of the jet cooling channel was measured by analyzing the Nusselt number Nu, flow resistance coefficient f and comprehensive performance evaluation index ηPEC. Results show that compared to the prototype straight channel, the average temperature of the first wall heating surface is reduced by 182 K, and Nu is improved by 132% using a jet cooling channel under the same operating parameters. As the mass flow rate of the coolant increases, Nu and f of the jet cooling channel both increase, enhancing the cooling performance. Changing the heat flux density of the heating surface will not affect its heat transfer characteristics and f. Within the considered structural parameter range, increasing the diameter and lateral spacing of the jet channel, reducing the taper ratio and longitudinal spacing of the jet channel, and using parallel arrangement of the jet channel can make the jet cooling channel have the best cooling performance.
  • Power Equipment and System
    Dynamic Model of Complete Machine and Vibration Characteristics Analysis of the Frame of Pumped Storage Unit
    HUANG Jinhui, ZENG Hui, WAN Jingyu, YE Haoyang, XUE Congcong, PANG Heqing, ZHANG Wanfu
    2025, 45(11): 1833-1843. https://doi.org/10.19805/j.cnki.jcspe.2025.240524
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Aiming at the vibration problem of pumped storage unit during operation, the influence of key working parameters such as unbalance of generator rotor, structural parameters of guide bearing, unit acceleration time and water mass of runner on the dynamic behavior of the complete machine was systematically studied. With the establishment of the dynamic model of the complete machine, the modal analysis was carried out to verify the accuracy of the model, and the stress and strain of the fixed parts were analyzed by statics analysis. Finally, the influence of different parameters on the lateral vibration of key components was analyzed. Modal and static analyses of the upper/lower frames show that the natural frequencies are higher than the resonance threshold, and the stress and deformation conform to the safe operation standard. Harmonic response results show that the lateral amplitude can be reduced by reducing the unbalance, increasing the phase difference and reducing the water mass. Transient analysis shows that the increase of unbalance will aggravate the lateral vibration and stress of the complete machine, and the deformation is related to the acceleration time and water mass, while with a increase of rotational speed, the stress increases and reaches its maximum value at the rated rotational speed.
    • New Energy Resources and EnergyStorage
  • New Energy Resources and EnergyStorage
    Analysis of Pitching Stall Characteristics of Darrieus-type Blades and Study on Geometric Parameter Sensitivity
    ZHANG Qiang, YUE Minnan, LI Chun, MIAO Weipao, ZHANG Wanfu
    2025, 45(11): 1844-1854. https://doi.org/10.19805/j.cnki.jcspe.2025.240459
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In order to gain a comprehensive understanding of the unique and complex Darrieus-type pitch motion of vertical axis wind turbine (VAWT) blades, and to clarify the influence laws of geometric parameters on aerodynamic characteristics, taking the NACA0018 airfoil as an object, the dynamic stall characteristics and the development of wake vortices of the Darrieus-type pitch motion of the blades were studied. The PARSEC parameterization method was utilized to obtain the blade geometric parameters. A radial basis function neural network surrogate model was constructed, and the sensitivity of the blade geometric parameters was analyzed using the Sobol index. Results show that in Darrieus pitching, as attack angle gradually increases, the blade suction surface first experiences reverse flow at the trailing edge, followed by leading-edge stall. Moreover, during downward pitch motion, the leading-edge stall causes significant oscillations in the aerodynamic force. The curvature at the maximum thickness and the tail edge deflection angle are the main factors affecting the pitch aerodynamic performance of the Darrieus type, and the blade thickness is particularly important for the moment coefficient. The sensitivity analysis is of great significance for blade aerodynamic profile design.
  • New Energy Resources and EnergyStorage
    Ultra-short Term PV Power Prediction Based on Dynamic Attention Mechanism and Multi-scale Feature Fusion
    MA Dong, HUANG Yiling, ZHANG Zhe, XU Sida
    2025, 45(11): 1855-1863. https://doi.org/10.19805/j.cnki.jcspe.2025.240535
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To improve the accuracy and robustness of ultra-short term photovoltaic (PV) power prediction, a Transformer-based prediction model was proposed. Firstly, the wavelet decomposition was employed to break down the original power sequence into multi-scale components. Secondly, features were extracted from each component through sub-modules of the Transformer model, and above features were fused by multi-head attention mechanism. Then, a dynamic attention mechanism was designed to dynamically adjust attention weights based on external meteorological conditions. Finally, a hybrid loss function combining mean squared error and log-likelihood loss was adopted for model training. Results indicate that the proposed method outperforms existing mainstream models in terms of both prediction accuracy and generalization capability. During summer, when data exhibit significant fluctuations, this method can achieve an average absolute error of 0.085 9 MW and a root mean square error of 0.115 2 MW, which are notably lower than those of the sub-optimal Informer model. It provides new ideas and methods for the accurate prediction of PV power generation.
  • New Energy Resources and EnergyStorage
    Investigation of N2 and CO2 Effects on Laminar Burning Velocity of Biomass Gas Based on Decoupling Method
    LIU Zheng, GAO Chuang, HUANG Weiguang
    2025, 45(11): 1864-1871. https://doi.org/10.19805/j.cnki.jcspe.2025.240579
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Dilution combustion enables high efficiency combustion with low pollution. The effects of N2 and CO2 as diluents on the laminar burning velocity (LBV) of biomass-derived CH4/CO/H2 syngas were explored from a chemical-kinetic perspective. The reaction mechanism of syngas combustion was modified to set up virtual N2 and CO2 diluents, allowing the individual effects on the LBV, namely, the dilution, thermal, direct reaction and three-body reaction effects, to be decoupled. The variation of contributions from the four effects with pre-heat temperature, pressure and equivalence ratio were analyzed from numerical simulations with each real or virtual diluents added at 0%-60% (volume fraction) to the mixture. In addition, the relationship between the peak concentrations of active radicals (H/OH) and the LBV was examined. A linear correlation is observed with the best fit obtained at higher equivalence ratios, whereas temperature and pressure exert only minor influence on the fit quality.
  • New Energy Resources and EnergyStorage
    Research Progress on Doping Modification of Iron-based Oxygen Carriers in Chemical Looping Technology
    LIANG Zhiyong, ZHOU Haozhe
    2025, 45(11): 1872-1880. https://doi.org/10.19805/j.cnki.jcspe.2025.240563
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Chemical looping technology is a new energy utilization technology that uses oxygen carrier instead of air to react with fuel. It has development potential in carbon reduction and clean, efficient utilization of energy. Based on a lot of research work on the improvement of oxygen carrier properties, modification effects of alkali metal, alkaline earth metal, transition metal and rare earth metal on iron-based oxygen carrier were deeply analyzed, including reactivity, oxygen vacancy formation energy, oxygen migration rate, cycling stability, surface active sites and carbon resistance of iron-based oxygen carriers. The focus of different dopants on the modification of iron-based oxygen carrier properties was discussed. Finally, the development trend of screening and theoretical design of iron-based oxygen carriers in the future was systematically summarized and prospected, providing references and inspirations for the further development of chemical looping technology.
    • Digitalization and Intelligentization
  • Digitalization and Intelligentization
    Ammonium Bisulfate Deposition Characteristics and Control Strategy Optimization for Coal-fired Power Plants Coupled with Waste Heat Recovery System During Transient Process
    GAO Wei, CHEN Xun, LIU Ming, ZHAO Yongliang, WANG Chaoyang, YAN Junjie
    2025, 45(11): 1881-1891. https://doi.org/10.19805/j.cnki.jcspe.2025.240546
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To accommodate more renewable energy power, coal-fired power plants operate under low-load and transient load conditions for extended periods, resulting in low operational efficiency and intensified ammonium bisulfate deposition on the back-end heating surfaces of boilers. Dynamic models of the coal-fired power plant coupled with waste heat recovery system were developed to investigate ammonium bisulfate sulfate deposition behavior during transient process, and an optimized control strategy for load-varying operations was proposed. Results show that during load variation process from 75%THA to 50%THA, the proposed strategy can avoid the deposition of ammonium bisulfate sulfate in the hot section of the air preheater rotor, while maintaining the boiler exhaust gas temperature within a reasonable range. Furthermore, during the process of load reduction and increase, the cumulative deposition Radian number of ammonium bisulfate sulfate deposition in the air preheater is reduced by 2 100 and 29 600, respectively.
  • Digitalization and Intelligentization
    Study on Dynamic Prediction Model of Boiler Thermal Efficiency Based on Deep Learning
    WANG Zhi, YIN Yongbo, XU Shiming, PENG Xianyong, ZHOU Huaichun
    2025, 45(11): 1892-1904. https://doi.org/10.19805/j.cnki.jcspe.2025.240549
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Thermal efficiency is an important indicator for the evaluation of boiler equipment performance and unit operation economy. For the high-dimensional nonlinearity between thermal efficiency and auxiliary variables, Random forest algorithm was used to carry out supervised dimensionality reduction, and the convolutional neural network (CNN) for variable load conditions was proposed to construct a dynamic model of thermal efficiency in view of the typical time-series characteristics of boiler. In order to ensure that the model was lightweight, a channel equalization block was introduced into the conventional CNN with three convolutional layers to solve the problem of channel collapse due to the suppression of feature maps, and a thermal efficiency prediction model based on channel equalization CNN (CE-CNN) was constructed. Simulation experiments were conducted using historical data from a 600 MW real boiler. Results show that the CE-CNN achieves a root mean square error of (0.101±0.008)%, reducing training time by 29.97% compared to a 6-layer CNN, which validates the effectiveness of the model.
  • Digitalization and Intelligentization
    Stability Improvement of Boiler Heat Storage Utilization by Observer Based on PID
    PANG Dawei, QIN Tianmu, DU Ming, NIU Yuguang
    2025, 45(11): 1905-1913. https://doi.org/10.19805/j.cnki.jcspe.2025.240602
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In order to smooth the frequency fluctuations caused by the grid connection of renewable energy, thermal power units will frequently use each part of the energy storage to improve the frequency response ability. The process of primary frequency regulation was described accurately in view of the complex variation characteristics between boiler heat storage coefficient, main steam pressure and primary frequency regulation ability of units. According to the change of model parameters caused by heat storage utilization, observer based-PID (OB-PID) primary frequency regulation control strategy was designed, and the tracking performance, disturbance suppression performance and robustness performance were simulated and tested respectively. Results show that the primary frequency regulation system based on OB-PID achieves great performance improvement with minimal physical structure changes, which is conducive to improving the stability of primary frequency regulation in the furnace side heat storage utilization.
  • Digitalization and Intelligentization
    Temperature Field Tomography Measurement Based on Focusing Radiation Camera
    YAO Pengbo, LIU Zhaoyu, SHEN Guoqing
    2025, 45(11): 1914-1922. https://doi.org/10.19805/j.cnki.jcspe.2025.240539
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    An optical temperature measurement method for focusing radiation camera based on optical tomography algorithm was proposed. By establishing the biconical sampling model of the focusing radiation camera, the relationship between radiation intensity and temperature at different positions was determined by using the optical tomography coefficient matrix. Firstly, use the cross calibration plate to calibrate the object distance u. Secondly, the halogen standard light source was used to calibrate the maximum voltage corresponding to the object distance u. Finally, the voltage fitting curves corresponding to different distances were obtained and the combustion test was carried out. Results show that the method can effectively measure the temperature distribution at different depths of the combustion flame. The relative error in the direct measurement range of the camera is not more than 4.5%, and the relative error of the external estimated temperature is not more than 19.8%, which has higher accuracy.
    • Green Energy and Low-carbon Technology
  • Green Energy and Low-carbon Technology
    Molecular Simulation of Effect of Biochar Pore Structure Regulation and Surface Modification on CO2 Adsorption Properties
    WANG Ruikun, WANG Xue, ZHANG Bingdong, DONG Jialiang, ZHAO Zhenghui, YIN Qianqian, ZHANG Yue
    2025, 45(11): 1923-1931. https://doi.org/10.19805/j.cnki.jcspe.2025.240569
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Improving the pore size distribution and surface properties of biochar is an important strategy to enhance its CO2 adsorption capacity. Grand canonical Monte Carlo (GCMC) and molecular dynamics (MD) methods were used to investigate the CO2 adsorption mechanisms in biochars with different pore size distributions and surface nitrogen and oxygen functional groups. Results show that micropores facilitate CO2 adsorption, with microporous biochar (2-20 Å) achieving a CO2 adsorption capacity of 7.69 mmol/g, which represents a 92.73% increase compared to microporous/mesoporous biochar (2-30 Å). CO2 is adsorbed on the surface of micropores through van der Waals forces, and the stronger intermolecular interactions in smaller micropores make CO2 adsorption more stable, reducing diffusion and desorption. The modification of surface nitrogen and oxygen functional groups enhances the interaction energy between the biochar surfaces and CO2 molecules, altering the ratio of van der Waals to electrostatic interaction energy. After modification, the contribution of electrostatic interaction energy increases notably, accounting for 53% in pyrrolic-N-modified biochar and over 62% in carboxyl-modified biochar. The CO2 adsorption capacity of modified biochars is substantially improved, with pyrrolic-N- and carboxyl-modified biochars exhibiting the highest adsorption performances among all functionalized biochars, achieving CO2 adsorption of 10.87 mmol/g and 12.24 mmol/g, respectively.
  • Green Energy and Low-carbon Technology
    Chloride Migration, Transformation Behavior and Risk Assessment During Evaporation of Desulfurization Wastewater
    QI Hongfeng, ZHAO Ning, CHEN Heng, YANG Linjun
    2025, 45(11): 1932-1939. https://doi.org/10.19805/j.cnki.jcspe.2025.240631
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The evaporative technology for desulfurization wastewater can achieve zero discharge of wastewater from power plants. However, during the evaporation process, chloride ions in the wastewater can easily be released into the flue gas, leading to their cyclic enrichment in the desulfurization wastewater. This study investigated the migration and transformation behavior of chloride ions during the evaporation of desulfurization wastewater using both a single droplet evaporation device and a rotary spray evaporation experimental setup. Results show that the release process of chloride can be divided into three stages: the free water evaporation stage, the shell instability stage, and the shell pyrolysis stage. In the free water evaporation stage, free H+ ions in the desulfurization wastewater tend to combine with Cl- ions to form HCl. In the shell pyrolysis stage, the thermal decomposition of MgCl2·6H2O is the primary reason for HCl release. Furthermore, higher flue gas temperatures lead to a higher proportion of gaseous chlorine release. Adjusting the wastewater to a weak alkaline condition (pH≈9) can effectively reduce gaseous chlorine release. At a higher gas-to-liquid ratio during evaporation, the temperature level in the drying tower increases, resulting in a higher proportion of chlorine release. From the perspective of power plants that have implemented thermal flue gas evaporation processes, although the chlorine content in fly ash increases, the comprehensive utilization of fly ash from power plants remains largely unaffected.
    • Integrated Energy System
  • Integrated Energy System
    Economic Dispatch of Integrated Energy System Considering Source-load Coordinated Carbon Reduction
    BAO Gang, JIANG Wenyan, PENG Xiong
    2025, 45(11): 1940-1954. https://doi.org/10.19805/j.cnki.jcspe.2025.240598
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Under the background of ‘carbon peaking and carbon neutrality', the energy industry of China was developing towards low carbonization, and hydrogen-containing integrated energy system became an important support. In order to reduce the hydrogen cost and carbon emission, a source-load coordinated economic carbon reduction strategy for hydrogen integrated energy systems was proposed. Firstly, gas hydrogen production equipment was introduced on the source side to achieve economic and flexible hydrogen supply. Then, organic Rankine cycle, electric boiler, hydrogen fuel cell and hydrogen-doped gas turbine were introduced on the source side to improve the traditional cogeneration unit, and a new type of cogeneration unit with flexible output of heat and power was constructed. Secondly, comprehensive demand response of electricity, heat and cooling load on the load side was combined with the source side to achieve economical carbon reduction. Finally, the correlation between green certificate trading and ladder-type carbon trading was analyzed, and the green certificate-laddered carbon trading mechanisms was introduced to further constrain the carbon emissions of the system. With the minimum total operating cost of the system as the optimization objective, a low-carbon economic dispatch model of hydrogen-containing integrated energy system was constructed. Through the simulation of multiple scenarios, the results show that the carbon emission and total cost of the system are reduced by 40.49% and 22.43% respectively, which verifies the effectiveness of the proposed method in terms of low carbon and economy.
  • Integrated Energy System
    Research on Deep Peak Shaving Characteristics of Coal-fired Cogeneration Unit Based on Absorption Heat Pump Decoupling for Assistance of Renewable Energy Accommodation
    ZHANG Guozhu, ZHANG Juntai, MA Guofeng, LIU Ming, YAN Junjie
    2025, 45(11): 1955-1965. https://doi.org/10.19805/j.cnki.jcspe.2025.240536
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Taking a 350 MW cogeneration unit as the research object, an off-design model considering valve-point effect was established, and the absorption heat pump suitable for heat-power decoupling was designed. The deep peak shaving characteristics of the unit to assist renewable energy accommodation through heat-power decoupling were studied. Results show that the absorption heat pump decoupling can effectively enhance the deep peaking capacity of the cogeneration unit. The maximum newly added deep peaking capacity can reach up to 62 MW, and the coal saving capacity for peak shaving varies from 0 t/h to 28 t/h. The coal saving capacity for peak shaving under the same peak shaving load changes nonlinearly, and the maximum change amplitude can reach 1.1 t/h. After decoupling, the coal saving rate for peak shaving varies from 400 g/(kW·h) to 506 g/(kW·h), and the variation amplitude is 106 g/(kW·h). It is suggested that in the case of absorption heat pump decoupling, the cogeneration unit should be run in the area with high coal saving rate for peak shaving to achieve the maximum coal saving.
  • Integrated Energy System
    Electricity-Hydrogen Co-production System Based on Coupling of Solid Waste Plasma Gasification and Modular Nuclear Reactor
    CAO Jingwen, CHEN Heng, WU Haoran, YU Tianyang, WANG Xiuyan, WANG Xinju, LIU Kewen
    2025, 45(11): 1966-1976. https://doi.org/10.19805/j.cnki.jcspe.2025.240503
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    To enhance energy utilization rate while treating medical waste in a clean way, a system coupling solid waste plasma gasification with modular nuclear reactor for co-production of electricity and hydrogen was proposed. In this novel coupling system, medical waste treated by plasma gasification treatment to generate high-temperature syngas. The syngas was then cooled using steam and feedwater from the SMR (small modular reactor) power plant. After cooling, the syngas was purified and fed into a water-gas shift reactor. The product gas was then purified by a pressure swing adsorption (PSA) unit to produce hydrogen. The performance of this new system was evaluated from a thermodynamic perspective using a specific modular nuclear reactor as a case. Results show that the medical waste to energy efficiency is 58.83%, the total efficiency and the exergy efficiency of the integrated system reach 54.24% and 54.23%, respectively. Additionally, the net present value of the novel coupling system is approximately 777 535 300 yuan, with a dynamic payback period of 3.71 years. The novel coupling system is both efficient and economically feasible.