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Hai Zhang
Tsinghua University
CombustionBoiler (power generation)ChemistryCoalFluidized bed combustion
127Publications
19H-index
1,211Citations
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Publications 106
Newest
#1Haoshu Shen (THU: Tsinghua University)H-Index: 2
#2Yang Zhang (THU: Tsinghua University)H-Index: 13
Last. Guangxi Yue (THU: Tsinghua University)H-Index: 17
view all 6 authors...
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#1Haoshu ShenH-Index: 2
#2Yuxin WuH-Index: 14
Last. Junfu LyuH-Index: 4
view all 6 authors...
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 evaluate...
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#1Weiliang Wang (THU: Tsinghua University)H-Index: 6
#2Junfu Lyu (THU: Tsinghua University)H-Index: 4
Last. Weidou Ni (THU: Tsinghua University)H-Index: 22
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Coal-fired power is the main power source and the biggest contributor to energy conservation in the past several decades in China. It is generally believed that advanced technology should be counted on for energy conservation. However, a review of the decline in the national average net coal consumption rate (NCCR) of China’s coal-fired power industry along with its development over the past few decades indicates that the upgradation of the national unit capacity structure (including installing ...
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#1Lele Feng (THU: Tsinghua University)H-Index: 1
#2Hai Zhang (THU: Tsinghua University)H-Index: 19
Last. Hairui Yang (THU: Tsinghua University)H-Index: 19
view all 7 authors...
Abstract The classification performance of model coal mill classifiers with different bottom incoming flow inlets were experimentally and numerically studied. The flow field adjacent to two neighboring impeller blades were measured using the particle image velocimetry technique. The results showed that the flow field adjacent to two neighboring blades with the swirling inlet was significantly different from that with the non-swirling inlet. With the swirling inlet, there was a vortex located bet...
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#1Lele FengH-Index: 1
#2Qi Zhang (Ministry of Education)
Last. Hai ZhangH-Index: 19
view all 5 authors...
MILD combustion is featured with a uniform heat flux and low NOx emission, and is thus a promising technology for clean coal utilization. Establishing the theoretical criteria of coal combustion modes is essential to guide the design and organization of MILD coal combustion. In this work, different coal combustion modes were classified theoretically based on the analysis of time scale, heterogeneous ignition, heat transfer, and flue gas entrainment. The predicted coal combustion modes agreed wel...
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#1Lele Feng (Ministry of Education)H-Index: 1
#2Yuxin Wu (Ministry of Education)H-Index: 4
Last. Yang Zhang (Ministry of Education)H-Index: 13
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Abstract Soot cloud size is important in radiative heat transfer and particulate matter emission since it determines the integral effect in the sooty region; meanwhile, study on soot cloud size during single coal particle combustion is essential to develop theories of soot-relevant reaction pathways and mass transport. In this work, a 1-D transient coal combustion model with an empirical soot model was adopted and validated to study the effect of gas physicochemical properties and forced convect...
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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
view all 4 authors...
ABSTRACTEffects of hydrogen (H2), methane (CH4), ethylene (C2H4) and propylene (C3H6) blending on the ignition delay time of n-heptane/toluene mixtures were numerically studied under both homogeneo...
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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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#1Lilin Hu (THU: Tsinghua University)
#2Yang Zhang (THU: Tsinghua University)H-Index: 13
Last. Junfu Lyu (THU: Tsinghua University)H-Index: 4
view all 9 authors...
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
view all 6 authors...
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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