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Junfu Lyu
Tsinghua University
30Publications
4H-index
34Citations
Publications 32
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Abstract In circulating fluidized bed (CFB) boilers, L-shape platen superheaters often suffer from poor working conditions with a high risk of tube wall overtemperature. Thermal deviations of an L-shape platen superheater were studied by using a supercritical 600 MW CFB boiler as reference. Based on the prediction model of thermal deviations and a self-developed software, thermal deviations of the platen superheater were calculated and analyzed under three kinds of heat load distributions. The r...
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#1Hang Shi (THU: Tsinghua University)
#2Yuxin Wu (THU: Tsinghua University)H-Index: 14
Last.Junfu Lyu (THU: Tsinghua University)H-Index: 4
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Abstract The huge reserve of Zhundong (ZD) coal makes it important for energy utilization of China. However, big concerns on fouling and slagging in pulverized coal-firing boilers were risen due to its high alkali content. It’s important to investigate deposition in different heating surfaces of a boiler burning ZD coal. In this paper, XRF, XRD, ICP-OES were conducted to analyze the properties of ash deposits collected from different heating surfaces in a 350 MW boiler burning 30% Wudong (WD) an...
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#1Junping Gu (THU: Tsinghua University)H-Index: 2
#2Yuxin Wu (THU: Tsinghua University)H-Index: 14
Last.Junfu Lyu (THU: Tsinghua University)H-Index: 4
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Abstract Concentrated salt solutions are used as working fluids in heat exchangers for heavy oil drilling to meet the requirements of environmental protection. Deep understanding the nucleate flow boiling heat transfer mechanism of salt solutions is of great importance for the design and safe operation of modern steam power equipment. In this work, the nucleate flow boiling for NaCl solution and pure water was experimentally studied within the concentration (C) range of 0%–6% in a vertical heate...
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Abstract The dynamics of liquid penetration in porous wire mesh are experimentally studied in this work by particularly considering the influence of gravity. Similar experimental setups are used on the ground and in a drop tower facility in order to compare the experimental results directly. Visualization of the liquid penetrating process is realized by using single-layered wire mesh which is put between a pair of transparent parallel plates. The dependence of wire mesh on the parallel plates is...
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#1Yiqun Huang (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Yan Jin
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Abstract Due to high ash content and anisotropy of bedding structure, the effects of ash thickness and bedding structure anisotropy on combustion of oil shale semicoke were crucial. A two-dimensional mathematical model of oil shale semicoke particle combustion was developed and validated by combustion experiments of cylindrical Huadian oil shale semicoke particles on the self-designed Macro thermal gravimetric analyzer (TGA), with a weighting capacity over 100 g. There was obvious anisotropy dur...
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#1Shahong Zhu (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Hairui Yang (THU: Tsinghua University)H-Index: 19
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Abstract 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 operation. Maldistribution of powder in the different injecting ports seriously limits inner-furnace desulfurization performance owing to inefficient mixing of limestone powder and SO2. The gas–solid flow characteristics of an industrial-scale multiple-branching limestone-conveying pipeline system of a 200 MW circulating fluidized...
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#1Lilin Hu (THU: Tsinghua University)
#2Yang Zhang (THU: Tsinghua University)H-Index: 13
Last.Junfu Lyu (THU: Tsinghua University)H-Index: 4
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Abstract Combustion and NOx emission characteristics of a bituminous coal (BC) blended with semi-coke (SC) are investigated using a Thermogravimetric Analyzer (TGA) and Drop Tube Furnace (DTF) at a different SC blending ratio Xsc. TGA results show that BC and SC have similar mass loss patterns but BC-SC blends have a second trough on their DTG curves. The addition of semi-coke increases ignition and burnout temperatures of the blends, but barely affects the burnout rate. Within 95% mass loss, th...
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#1Wenfeng Shen (THU: Tsinghua University)H-Index: 3
#2Yang Zhang (THU: Tsinghua University)H-Index: 13
Last.Hai Zhang (THU: Tsinghua University)H-Index: 19
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Abstract Pyrolysis experiments of typical C8 hydrocarbons, including the straight-chain, branched-chain, cyclic and aromatics structure ones, were carried out using a jet-stirred reactor (JSR) at 1 atm and temperature from 873 K from 1173 K for residence time from 0.2 s to 2.0 s. To assess the carbon number effect, studies were also conducted on two C16 alkanes. The mole fractions of light gases, including H2, main C1–C3 alkanes and C2–C4 alkenes in the pyrolysis product, were measured by a gas ...
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#1Weiliang Wang (THU: Tsinghua University)H-Index: 6
#2Zheng Li (THU: Tsinghua University)H-Index: 23
Last.Weidou Ni (THU: Tsinghua University)H-Index: 22
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As the main power source of China, coal-fired power industry has achieved a great progress in installed capacity, manufacturing technologies, thermal efficiency, as well as pollutant control during the past century. With the fast development of renewable energies, coal-fired power industry is experiencing a strategic transformation. To specify the development of coal-fired power industry, its development history is reviewed and the technical progresses on aspects of thermal efficiency, pollutant...
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