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Journal of Thermal Science 2024年第3期33卷 888-898页

作者： ZHANG Lei YANG Zhenyu sun enhui ZHANG Qian AN Guangyao YUAN Wei Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology North China Electric Power UniversityBaoding071003China School of Energy Power&Mechanical EngineeringNorth China Electric Power UniversityBaoding071028China

The low power consumption of the near-critical compressor is the key factor for the high efficiency of supercritical CO_(2)Brayton *** the numerical simulation of the compressor,the rapid changes in the thermophysical properties of the CO_(2)near the critical point make it difficult to capture the condensation *** paper investigates the influence of fluid physical properties on the condensation ***,the differences in the physical properties of CO_(2)in the SRK EOS(equation of state),PR EOS,and SW EOS are ***,the simulation of nozzles and compressors were carried out and *** show that the condensation positions predicted by the three EOSs are basically the *** with SW EOS,the disparities between the maximum condensation mass fraction predicted by the PR and SRK EOSs is5.7%and 11.5%,and that of total pressure ratio is 0.3%and 3.8%,*** results show that PR EOS can be considered for numerical simulation in engineering *** its physical property calculation results are closer to the actual physical properties while the physical properties change more gently,it has considerable accuracy and numerical stability.

关键词： supercritical carbon dioxide equation of state centrifugal compressor numerical simulation condensation

Investigating Load Regulation Characteristics of a Wind-PV-Coal Storage Multi-Power Generation System

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Energy Engineering 2024年第4期121卷 913-932页

作者： Zhongping Liu enhui sun Jiahao Shi Lei Zhang Qi Wang Jiali Dong Sinopec Star Co. Ltd.Zhengzhou450000China Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology North China Electric Power UniversityBaoding071003China

There is a growing need to explore the potential of coal-fired power plants(CFPPs)to enhance the utilization rate of wind power(wind)and photovoltaic power(PV)in the green energy *** study developed a load regulation model for a multi-power generation system comprising wind,PV,and coal energy storage using realworld *** power supply process was divided into eight fundamental load regulation scenarios,elucidating the influence of each scenario on load *** the framework of the multi-power generation system with the wind(50 MW)and PV(50 MW)alongside a CFPP(330 MW),a lithium-iron phosphate energy storage system(LIPBESS)was integrated to improve the system’s load regulation *** energy storage operation strategy was formulated based on the charging and discharging priority of the LIPBESS for each basic scenario and the charging and discharging load calculation method of LIPBESS auxiliary *** optimization using the particle swarm algorithm,the optimal capacity of LIPBESS was determined to be within the 5.24-4.88 MWh *** an economic perspective,the LIPBESS operating with CFPP as the regulating power source was 49.1% lower in capacity compared to the renewable energy-based storage mode.

关键词： Wind power coal-fired power PV multi-power generation system lithium-iron phosphate energy storage system

基于流线曲率法的超临界二氧化碳离心压缩机通流计算方法

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热力发电 2024年第2期53卷 124-132页

作者：戎毅廖凯龙孙恩慧王立志沈阳飞机设计研究所扬州协同创新研究院有限公司江苏扬州225111 低品位能源多相流与传热北京市重点实验室(华北电力大学) 北京102206

超临界二氧化碳(S-CO_(2))的真实气体特性使得开展S-CO_(2)离心压缩机的三维数值模拟难以获得稳定的收敛结果,同时,数值计算的时间成本进一步增加了压缩机设计优化的难度。对此,本文首先对压缩机开展三维数值模拟,得到流场信息及对应的... 详细信息

超临界二氧化碳(S-CO_(2))的真实气体特性使得开展S-CO_(2)离心压缩机的三维数值模拟难以获得稳定的收敛结果,同时,数值计算的时间成本进一步增加了压缩机设计优化的难度。对此,本文首先对压缩机开展三维数值模拟,得到流场信息及对应的损失分布,然后在传统流线曲率法中叠加一维损失模型,并沿流线分段计算CO_(2)压缩因子,以此反映真实气体的压缩过程,建立适用于S-CO_(2)离心压缩机的通流计算方法。将通流计算结果与三维数值模拟结果进行对比后发现:流线曲率法得到的子午面相对速度场分布和焓分布与计算流体动力学(computational fluid dynamics,CFD)结果基本一致;叶片出口温压数据与CFD结果接近,误差分别为0.23%和1.08%,总静等熵效率相差1.5%。结果表明,采用流线曲率法的通流计算可以快速获得较准确的S-CO_(2)离心压缩机叶轮性能参数。

关键词：离心压缩机流线曲率法损失模型性能预测

冷却器热量回收在S-CO_(2)燃煤发电系统中的优化方案研究

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中国科学：技术科学 2024年第2期54卷 225-235页

作者：郭源东孙恩慧徐进良王兆福刘国华华北电力大学河北省低碳高效发电技术重点实验室保定071003 华北电力大学低品位能源多相流与传热北京市重点实验室北京102206

S-CO_(2)循环的冷却过程为变温放热,因此,通过空气回热实现冷却器的热量回收(CHR)是提高S-CO_(2)燃煤发电系统效率的有效方法.炉膛尾部烟道烟气余热吸收是冷却器热量回收应用于S-CO_(2)燃煤发电面临的关键难题.针对这一问题,本文首先围... 详细信息

S-CO_(2)循环的冷却过程为变温放热,因此,通过空气回热实现冷却器的热量回收(CHR)是提高S-CO_(2)燃煤发电系统效率的有效方法.炉膛尾部烟道烟气余热吸收是冷却器热量回收应用于S-CO_(2)燃煤发电面临的关键难题.针对这一问题,本文首先围绕具备再热与间冷的再压缩循环(RC+RH+IC)应用了双烟道冷却器热回收方案,使空气预热器内的空气能在更宽的温区吸收烟气热量,显著提高炉膛烟气余热吸收能力,解决了进行冷却器热回收时排烟温度升高的问题.当循环主汽参数为620℃/30 MPa时,相比单烟道冷却器热量回收方案,循环效率由51.95%(RC+RH+IC+CHR)提升至52.36%(RC+RH+IC+DCHR).为进一步优化冷却器热回收与烟气余热吸收的耦合关系,本文提出冷却器减流方案(CFR),并应用循环拆分法对新系统进行分析.结果表明,该方案提高了系统的回热程度,增加了循环中效率等效为1的子循环工质质量流量份额,最终使循环效率由51.95%(RC+RH+IC+CHR)提升至52.50%(RC+RH+IC+DCHR+CFR).

关键词： S-CO_(2)燃煤发电系统冷却器热量回收冷却器减流循环拆分法双烟气通道

超临界回热燃煤发电系统热力循环的构建及分析

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中国科学：技术科学 2024年第2期54卷 236-246页

作者：孙恩慧李汇锋钱启琛纪洪福张磊徐进良华北电力大学河北省低碳高效发电技术重点实验室保定071003 华北电力大学电站能量传递转化与系统教育部重点实验室北京102206

回热过程对朗肯循环热效率的提升起重要作用,但当前有关回热的研究仅局限在亚临界区域,并未对超临界区域进行深入的探索.本文提出超临界回热方式,构建了超临界回热循环,从效率角度探明了该回热过程的优势.以某二次再热燃煤发电系统为例... 详细信息

回热过程对朗肯循环热效率的提升起重要作用,但当前有关回热的研究仅局限在亚临界区域,并未对超临界区域进行深入的探索.本文提出超临界回热方式,构建了超临界回热循环,从效率角度探明了该回热过程的优势.以某二次再热燃煤发电系统为例,基于热力学第一、第二定律对其与BEST小机回热进行热力学理论计算与对比分析.结果表明,超临界回热可有效提高发电效率,在本文案例中,当主汽参数为32 MPa和610/625/622℃时,所提出的两种超临界回热过程可在发电效率47.57%基础上,分别提升0.96%与1.02%, BEST小机回热可使发电效率提升0.1%.同时发现BEST小机回热可有效降低循环回热过程的?损,超临界回热则可大幅降低锅炉?损,当两者耦合时,可以实现效率的进一步提升(48.7%和48.76%).本文提出的超临界回热过程是在亚临界区域回热的基础上突破瓶颈,进一步实现了在超临界区域的回热,是循环回热优化的进一步发展.

关键词：朗肯循环超临界回热 BEST小机发电效率 ?分析

Life Cycle Assessment Analysis and Comparison of 1000 MW S-CO_(2)Coal Fired Power Plant and 1000 MW USC Water-Steam Coal-Fired Power Plant

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Journal of Thermal Science 2022年第2期31卷 463-484页

作者： LI Mingjia WANG Ge XU Jinliang NI Jingwei sun enhui Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy&Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power UniversityBeijing 102206China

The objective of this paper is to understand the benefits that one can achieve for large-scale supercritical CO_(2)(S-CO_(2))coal-fired power *** aspects of energy environment and economy of 1000 MW S-CO_(2)coal-fired power generation system and 1000 MW ultra-supercritical(USC)water-steam Rankine cycle coal-fired power generation system are analyzed and compared at the similar main vapor parameters,by adopting the neural network genetic algorithm and life cycle assessment(LCA)***-objective optimization of the 1000 MW S-CO_(2)coal-fired power generation system is further carried *** power generation efficiency,environmental impact load,and investment recovery period are adopted as the objective *** main vapor parameters of temperature and pressure are set as the decision *** results are concluded as ***,the total energy consumption of the S-CO_(2)coal-fired power generation system is 10.48 MJ/k Wh and the energy payback ratio is 34.37%.The performance is superior to the USC coal-fired power generation ***,the resource depletion index of the S-CO_(2)coal-fired power generation system is 4.38μPRchina,90,which is lower than that of the USC coal-fired power generation system,and the resource consumption is ***,the environmental impact load of the S-CO_(2)coal-fired power generation system is 0.742 m PEchina,90,which is less than that of the USC coal-fired power generation system,0.783 m PEchina,*** all environmental impact types,human toxicity potential HTP and global warming potential GWP account for the most environmental ***,the investment cost of the S-CO_(2)coal-fired power generation system is generally less than that of the USC coal-fired power generation system because the cost of the S-CO_(2)turbine is only half of the cost of the steam *** optimal turbine inlet temperature T_(5)becomes smaller,and the optimal turbine inlet pressure is unchanged at 622.082°C/30 MPa.

关键词： S-CO_(2)power plant ultra-supercritical water-steam Rankine cycle power plant life cycle assessment energy efficiency environment impact economic performance

S-CO_(2)部分膨胀循环余热利用系统热力学特性研究

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热力发电 2024年第6期53卷 79-86页

作者：王慧芳孙恩慧赵乘新徐进良乔加飞王兵兵国电电力发展股份有限公司北京100101 华北电力大学低品位能源多相流与传热北京市重点实验室北京102206 国能国华(北京)电力研究院有限公司北京102209

针对通过热力循环实现余热利用的系统,解决循环热效率与热源利用率之间的相互制约问题是构建高效余热吸收系统的关键。以超临界二氧化碳循环为例,为拓宽余热吸收温区从而提高余热利用效率,构建了新型循环即部分膨胀循环,耦合燃气轮机排... 详细信息

针对通过热力循环实现余热利用的系统,解决循环热效率与热源利用率之间的相互制约问题是构建高效余热吸收系统的关键。以超临界二氧化碳循环为例,为拓宽余热吸收温区从而提高余热利用效率,构建了新型循环即部分膨胀循环,耦合燃气轮机排气后,余热利用系统的发电效率为28.62%,循环热效率34.03%,热源利用率84.11%。为论证部分膨胀循环的优势,进一步构建了基于单回热布雷顿循环与再压缩布雷顿循环的余热利用系统,并对3种循环进行对比,通过热力学第一定律、第二定律计算分析,发现部分膨胀循环的发电效率均高于其他2种经典循环;通过分析循环流程,揭示了部分膨胀循环效率较高的原因,即部分膨胀结构拓宽了吸热温区,使得热源利用率大幅升高,从而提高了发电效率。

关键词：余热利用超临界二氧化碳循环部分膨胀热源利用率

An Investigation of Battery Energy Storage Aided Wind-Coal Integrated Energy System

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Energy Engineering 2023年第7期120卷 1583-1602页

作者： enhui sun Jiahao Shi Lei Zhang Hongfu Ji Qian Zhang Yongyi Li Department of Power Engineering North China Electric Power UniversityBaoding071003China Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology Baoding071003China

This paper studies the feasibility of a supply-side wind-coal integrated energy *** on grid-side data,the load regulation model of coal-fired power and the wind-coal integrated energy system model are *** to the simulation results,the reasons why the wind-coal combined power supply is difficult to meet the grid-side demand are revealedthrough scenario *** thewind-coal combinedoperation,a wind-coalstorage integrated energy system was proposed by adding lithium-iron phosphate battery energy storage system(LIPBESS)to adjust the load of the *** to the four load adjustment scenarios of grid-side instructions of the wind-coal system,the difficulty of load adjustment in each scenario is *** on the priority degree of LIPBESS charge/discharge in four scenarios at different time periods,the operation mode of two charges and two discharges per day was *** on the independent operation level of coal-fired power,after the addition of LIPBESS(5.5 MWh),the average qualified rate of multi-power operation in March and June reached the level of independent operation of coal-fired power,while the average qualified rate of the remaining months was only 5.4%different from that of independent operation of coal-fired *** with the wind storage mode,the energy storage capacity and investment cost of wind-coal-storage integrated energy system are reduced by 54.2%and 53.7%,respectively.

关键词： Wind power lithium-iron phosphate battery energy storage system coal-fired power integrated energy system

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植物纤维拆解及自成型技术研究进展

化工新型材料 2024年第1期52卷 23-28页

作者：李浩傅彬黄红英李欣欣孙恩惠雍宬陈玲吴述平曲萍江苏省农业科学院农业资源与环境研究所农业农村部长江下游平原农业环境重点实验室江苏省有机固体废弃物资源化协同创新中心南京210014 江苏大学材料科学与工程学院镇江212013 农业农村部农业生态与资源保护总站北京100125

植物纤维属于植物的厚壁组织,植物纤维的利用对我国减少碳排放,实现碳中和目标具有重要意义。植物纤维是一种具备高长径比,能够自交织成型的生物质材料,将其加工成纤维制品,可以减轻对石油基等不可再生资源的依赖。重点介绍了化学拆解... 详细信息

植物纤维属于植物的厚壁组织,植物纤维的利用对我国减少碳排放,实现碳中和目标具有重要意义。植物纤维是一种具备高长径比,能够自交织成型的生物质材料,将其加工成纤维制品,可以减轻对石油基等不可再生资源的依赖。重点介绍了化学拆解、物理拆解和生物拆解获得不同尺度植物纤维的机理、优缺点,并且对拆解后不同尺度的植物纤维所需的成型工艺和发展趋势进行了综述。未来需要在木质素高效拆解的基础上,开发不同尺度纤维的高效成型技术,使预处理和成型工艺更加低碳环保,提高植物纤维制品的应用效果和使用性能。

关键词：植物纤维纤维拆解纤维尺度加工成型

Formable porous biochar loaded with La-Fe(hydr)oxides/montmorillonite for efficient removal of phosphorus in wastewater:process and mechanisms

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Biochar 2022年第1期4卷 296-314页

作者： enhui sun Yanyang Zhang Qingbo Xiao Huayong Li Ping Qu Cheng Yong Bingyu Wang Yanfang Feng Hongying Huang Linzhang Yang Charles Hunter Key Laboratory of Saline-Alkali Soil Improvement and Utilization(Coastal Saline-Alkali Lands) Ministry of Agriculture and Rural AffairsJiangsu Collaborative Innovation Center for Solid Organic Waste Resource UtilizationInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210014China School of Life Sciences College of AgricultureEngineering and ScienceUniversity of KwaZulu-Natal(Pietermaritzburg Campus)Private Bag X01Scottsville 3209Republic of South Africa State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Institute of Germplasm Resources and Biotechnology Jiangsu Academy of Agricultural SciencesNanjing 210014China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China

The development of biochar-based granule-like adsorbents suitable for scaled-up application has been attracting increasing attention in the field of water ***,a new formable porous granulated biochar loaded with La-Fe(hydr)oxides/montmorillonite(LaFe/MB)was fabricated via a granulation and pyrolysis process for enhanced phosphorus(P)removal from *** acted as a binder that increased the size of the granulated biochar,while the use of Fe promoted the surface charge and facilitated the dispersion of La,which was responsible for selective phosphate ***/MB exhibited rapid phosphate adsorption kinetics and a high maximum adsorption capacity(Langmuir model,52.12 mg P g^(−1)),which were better than those of many existing granulated *** desorption and recyclability experiments showed that LaFe/MB could be regenerated,and maintained 76.7%of its initial phosphate adsorption capacity after four adsorption *** high hydraulic endurance strength retention rate of the developed material(91.6%)suggested high practical applicability in actual ***-static attraction,surface precipitation,and inner-sphere complexation via ligand exchange were found to be involved in selective P removal over a wide pH range of *** thermodynamic parameters were determined,which revealed the feasibility and spontaneity of *** on approximate site energy distribution analyses,high distribution frequency contributed to efficient P *** research results provide a new insight that LaFe/MB shows great application prospects for advanced phosphate removal from wastewater.

关键词： Formable porous biochar Montmorillonite Metal(hydr)oxide Wastewater phosphate removal Adsorption mechanism