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“双碳”目标下我国电力系统灵活性资源发展策略研究

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中国工程科学 2024年第4期26卷 108-120页

作者：李政李伟起张忠伟常淦吕俊复岳光溪李立浧倪维斗清华大学能源与动力工程系北京100084 清华四川能源互联网研究院成都610200 中国南方电网公司广州510620

大力发展新能源是实现“双碳”目标的重要途径,但新能源的随机性、波动性和间歇性特点给电力系统供需平衡及稳定性带来严峻挑战,亟需发展多元灵活性资源来保障系统的安全稳定运行。本文综述了我国碳中和目标下电力需求及电源结构发展路... 详细信息

大力发展新能源是实现“双碳”目标的重要途径,但新能源的随机性、波动性和间歇性特点给电力系统供需平衡及稳定性带来严峻挑战,亟需发展多元灵活性资源来保障系统的安全稳定运行。本文综述了我国碳中和目标下电力需求及电源结构发展路线的相关研究情况,深入分析了不同风光发电量比例下电力系统对灵活性调节的不同需求,并从高峰能力(充足性)、爬坡灵活性、稳定性、惯性4个方面阐述了未来所需要的“源网荷储”各类灵活性资源特性;结合国际经验,提出了保障安全、低碳发展、经济最优的灵活性资源发展原则,并在分析我国灵活性资源发展存在问题的基础上,提出了与我国电力行业减排目标和中长期电力结构变化趋势相一致的灵活性资源发展路线;最后从电源、电网、负荷、储能、市场机制5个方面提出了发展灵活性资源的重点举措。

关键词： “双碳”目标电力系统高比例风光灵活性资源发展路线

Clean and highly-efficient utilization of coal

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Frontiers in Energy 2021年第1期15卷 1-3页

作者： Guangxi YUE junfu lyu Shuiqing LI Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China

The International Symposium on Coal Combustion(ISCC-9)was held at the Qingdao City,China in July,21-24,*** attracted over 270 engineers and scientists from 16 countries including China,USA,Germany,Japan,Russia,Australia,South Korea,India,South Africa,Turkey,Pakistan,Italy,Colombia,Vietnam,Portugal,and *** symposium has strongly reinforced the collaboration and discussion between academic researchers and industry experts,which emphasizes the main theme of the ISCC of establishing an effective bridge between academia and industry.

关键词： Clean Australia symposium

An experimental study on ignition of single coal particles at low oxygen concentrations

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Frontiers in Energy 2021年第1期15卷 38-45页

作者： Wantao YANG Yang ZHANG Lilin HU junfu lyu Hai ZHANG Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

An experimental study on the ignition of single coal particles at low oxygen concentrations (XO_(2)<21%) was conducted using a tube furnace. The surface temperature (Ts) and the center temperature (Tc) of the coal particles were obtained from the images taken by an infrared camera and thermocouples respectively. The ignition processes were recorded by a high-speed camera at different XO_(2) values and furnace temperatures Tw. Compared with literature experimental data obtained at a high XO_(2) value, the ignition delay time τi decreases more rapidly as XO_(2) increases at the low XO_(2) region. The responses of Ts and Tc to the variation of XO_(2) are different: Ts decreases while Tc remains nearly constant with increasing XO_(2) at a low XO_(2) value. In addition, τi is less sensitive to Tw while the ignition temperature Ti is more sensitive to Tw at a low XO_(2) value than in air. Observations of the position of flame front evolution illustrate that the ignition of a coal particle may change from a homogeneous mode to a heterogeneous or combined ignition mode as XO_(2) decreases. At a low XO_(2) value, buoyancy plays a more significant role in sweeping away the released volatiles during the ignition process.

关键词： coal particles low oxygen concentration ignition ignition temperature ignition modes

Numerical study on maldistribution of gas-solid flow in multiple-branching limestone-conveying pipelines of circulating fluidized bed

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Particuology 2019年第5期17卷 14-21页

作者： Shahong Zhu Man Zhang Juanli Zhang junfu lyu Hairui Yang Key Laboratory for Thermal Science and Power Engineering of Ministry Education State Key Laboratory of Power Systems Department of Energy and Power Engineering. Tsinghua University. Beijing 100084 China

As one of the most important auxiliary systems of a circulating fluidized bed boiler,the limestone pneumatic conveying system is of great significance to its *** of powder in the different injecting ports seriously limits inner-furnace desulfurization performance owing to inefficient mixing of limestone powder and *** gas-solid flow characteristics of an industrial-scale multiple-branching limestone-conveying pipeline system of a 200 MW circulating fluidized bed boiler were studied using a computational particle fluid dynamics *** maldistribution intensity was studied under different operating conditions of air velocity and particle mass flow *** results indicated that when the air velocity increased,the maldistribution was mitigated,but when the particle mass flow rate increased,the maldistribution *** solve this problem,two improved schemes were proposed:adding a deflector at different angles and changing the height of pipeline *** to the simulation,the maldistribution could be efficiently mitigated using a distributor height in the range of 100-120 mm and a deflector angle of 10°-30°.

关键词： Circulating fluidized bed Limestone Pneumatic conveying Multiple-branching pipeline Maldistribution

Air pollutant control and strategy in coal-fired power industry for promotion of China’s emission reduction

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Frontiers in Energy 2019年第2期13卷 307-316页

作者： Weiliang WANG Bo LI Xuan YAO junfu lyu Weidou NI Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education Department of Energy and Power EngineeringTsinghua University Beijing 100084 China Electric Power Planning and Engineering Institute Beijing 100120China Beijing Guodian Longyuan Environmental Engineering Co. Ltd. Beijing 100084China

Coal-fired power industry has always been the major power source in China. As coal-fired power industry consumes around a half of China’s coal production, it is always thought to be a big air pollutant emission source. As more and more strict legislations in coal-fired power industry have been issued by the government, the emission performance in coal-fired power industry has been drastically reduced *** on a brief review of the development of emission control in China’s coal-fired power industry, the affecting mechanism among the development of installed capacities of emission control device, pollutant emission, and emission performances in coal-fired power industry is studied. According to a systematic study on the development of emissions of classified categories, the role of coal-fired power industry as a pollutant source is *** is found that, coal- fired power industry has contributed the most to China5S emission reduction, and the barycenter of air pollutant emission has been transformed to other high energy consumption industries,like heat, iron/steel, and *** some development strategies are suggested, such as maintaining the current emission standard in coal-fired power industry;expending the coal-fired power emission standards to categories of heat generation and supply, nonmetallic mineral production and ferrous metals smelt-ing and processing;and controlling other heavy metal by consulting the method of Hg control.

关键词： coal-fired power industry energy intensive industries pollutant emission control NOx SO2 soot

Design and application of a novel coal-fired drum boiler using saline water in heavy oil recovery

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Frontiers in Energy 2020年第4期14卷 715-725页

作者： Junping GU Yuxin WU Liping WU Man ZHANG Hairui YANG junfu lyu Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Yucheng Thermo Ltd. Karamay 834000China

In this paper,the design and operation of a novel coal-fired circulating fluidized bed(CFB)drum boiler that can generate superheated steam using saline water were *** natural circulation water dynamics with a drum was adopted instead of the traditional once-through steam generator(OTSG)design,so that superheated steam can be generated for the better performance of the steam assisted gravity drainage(SAGD)technology in heavy oil *** optimized staged evaporation method was proposed to further decrease the salinity of water in the clean water section of the *** evaporating pipes of the salted water section were rearranged in the back pass of the boiler,where the heat load is low,to further improve the heat transfer safety.A CFB combustion technology was used for coal firing to achieve a uniform heat transfer condition with low heat *** control technologies were adopted to reduce pollutant *** on the field test,the recommended water standard for the coal-fired CFB drum boilers was *** the present technology,the treated recovery wastewater can be reused in steam-injection boilers to generate superheated *** engineering applications show that the boiler efficiency is higher than 90%,the blowdown rate is limited within 5.5%,and the superheat of steam can reach up to 30 ***,the heavy oil recovery efficiency is significantly ***,the pollutant emissions of SO2,NOV and dust are controlled within the ranges of 20-90 mg/(N·m^(3)),30-90 mg/(N·m^(3))and 2-10 mg/(N·m^(3))respectively.

关键词： drum steam injection boiler natural circulation recovery wastewater staged evaporation circulating fluidized bed(CFB)

Modeling study of combustion process of oil shale semicoke in a circulating fluidized bed boiler

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Carbon Resources Conversion 2018年第3期1卷 273-278页

作者： Yiqun Huang Man Zhang junfu lyu Hairui Yang Key Laboratory for Thermal Science and Power Engineering of Ministry of Education State Key Laboratory of Power SystemsDepartment of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

In this paper,the combustion process of oil shale semicoke was investigated by modeling,where intraparticle mass transfer resistance was especially *** ash formation and attrition characteristics of oil shale semicoke were also investigated by a laboratory test *** burnout time and residence time of different particle sizes were predicted,and the maximum particle size of which oil shale semicoke could be burned out in a 3 MW circulating fluidized bed boiler was obtained.

关键词： Oil shale semicoke Combustion CFB Ash formation Attrition

A decoupled method to identify affecting mechanism of crosswind on performance of a natural draft dry cooling tower

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Frontiers in Energy 2020年第2期14卷 318-327页

作者： Weiliang WANG junfu lyu Hai ZHANG Qing LIU Guangxi YUE Weidou NI Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

The natural draft dry cooling tower(NDDCT)has been increasingly used for cooling in power generation in arid *** crosswind affects the performance of a NDDCT in a complicated way,and the basic affecting mechanism is unclear,attempts have been made to improve the performance of a NDDCT based on limited *** paper introduces a decoupled method to study the complicated crosswind effects on the inlet and outlet of a NDDCT separately by computational fluid dynamics(CFD)modeling and hot state ***,the basic affecting mechanism of crosswind on the NDDCT performance is *** changes the inlet flow field of a NDDCT and induces mainstream vortices inside the tower,so as to degrade the ***,low crosswind deflects the upward plume at the outlet to further degrade the ventilation,while high crosswind induces the low pressure area at the outlet to reduce the ventilation degradation.

关键词： affecting mechanism crosswind decoupled method mainstream vortices natural draft dry cooling tower(NDDCT) degradation

Large eddy simulation of a 660 MW utility boiler under variable load conditions

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Frontiers in Energy 2021年第1期15卷 124-131页

作者： Haoshu SHEN Yuxin WU Minmin ZHOU Hai ZHANG Guangxi YUE junfu lyu Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China Department of Chemical Engineering University of UtahSalt Lake City 84112USA

Large eddy simulation (LES) has become a promising tool for pulverized coal combustion with the development of computational fluid dynamics (CFD) technologies in recent years. LES can better capture the unsteady features and turbulent structures of coal jet flame than Reynolds averaged Navier Stokes (RANS). The coal-fired power plants in China are now required to be operated in a wide load range and quickly respond to the electric grid. The boiler performance of variable loads should be evaluated in terms of flow, heat transfer, and combustion processes. In this paper, LES was applied to simulate a 660 MW ultra-supercritical boiler under BMCR (boiler maximum continue rate), 75%THA-100, and 50%THA-100 conditions. The predicted gas velocities agree well with the thermal calculation and the temperature error is less than 130 K. The simulation results show that the operation load has significant effects on the boiler performance. It is also proved that LES can provide guidance for the design and operation of advanced coal-fired boilers.

关键词： large eddy simulation ultra-supercritical boiler operation load