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RISS 인기검색어
- 검색키워드
- 저자 : Zhao Changsui (검색결과 6 건)
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Liang Cai,Chen Xiaoping,Zhao Changsui,Pu Wenhao,Lu Peng,Fan Chunlei 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
Experiments of dense-phase pneumatic conveying of pulverized coal using nitrogen were performed in an experimental test facility with the conveying pressure up to 4MPa and the solid-gas ratio up to 500 kg/㎥. The influences of the total conveying differential pressure, the moisture content, the superficial velocity and the pressure on the mass flow rate and the solid-gas ratio were investigated. Shannon entropy analysis of pressure fluctuation time series was developed to reveal the flow characteristics. Based on the distribution of the Shannon entropy in the different conditions, the flow stability and the evolutional tendency of Shannon entropy in different regimes and the regime transition processes were obtained. The results indicate that the solid gas ratio and Shannon entropy rise with increase in the total conveying differential pressure. A phase diagram and Shannon entropy reveal preferable regularity with superficial velocity. Shannon entropy is different for the different flow regimes, and it can be used to identify the flow regimes. As the moisture content increases, the mass flow rate, the pressure drop and Shannon entropy decrease. Shannon entropy rises with increase in pressure drop.
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CFD simulation of coal-water slurry flowing in horizontal pipelines
Liangyong Chen,Wenhao Pu,Changsui Zhao,Yufeng Duan 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
An Eulerian multiphase approach based on kinetic theory of granular flow was used to simulate flow of coal-water slurries (CWS) in horizontal pipelines. The RNG k-ε turbulent model was incorporated in the governing equation to model turbulent two-phase flow with strong particle-particle interactions. In this model, the coal particles with bimodal distribution were considered as two solid-phase components, and the moment exchange between solid and liquid as well as that between solid and solid were accounted for. The model was firstly validated with pressure gradient and concentration profile data from the open literature, and then validated with pressure gradient data of the authors’ experiments. The effects of influx velocity, total influx concentration and grain composition were numerically investigated, and the results have displayed some important slurry flow characteristics, such as constituent particle concentration distribution and velocity distribution as well as pressure gradients, which are very difficult to display in the experiments. The results suggest that both gravity difference between large and small particles and strong particleparticle interaction had significant effects on concentration distribution as well as velocity distribution.
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Chen Xiaoping,Fan Chunlei,Liang Cai,Pu Wenhao,Lu Peng,Zhao Changsui 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.3
of dense-phase pneumatic conveying of pulverized coal were carried out in a test facility witha conveying pressure up to 4 MPa. The influence of fluidization nitrogen flow rate, the flow rate of supplementarysolid mass flow rate was investigated. Test results indicate that with the increase in fluidization nitrogen flow rate, thesolid mass flow rate increases, and the solids to gas ratio increases at first and then declines. When the fluidization ofpulverized coal in the sending vessel becomes intensive, with the increase in supplementary nitrogen flow rate, thesolids to gas ratio declines and the solid mas flow rate increases. And the solid mass flow rate increases linearly withthe increase in presure diference between two hoppers. The experimental results provide a database for the design
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Liang Cai,Cai Jiaying,Xu Guiling,Xu Pan,Chen Xiaoping,Zhao Changsui 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
Conveying characteristics and flow stability are very important for design and control of a conveying system at high pressure. The influences of operating parameters and material properties on conveying characteristics were investigated in an experimental test facility with a conveying pressure up to 4MPa. Wavelet transform and Shannon entropy analysis were applied to analyzing pressure drops through horizontal pipe in order to obtain the stability criterion. Results indicated that the mass flow rate of biomass decreased, while the mass flow rate of pulverized coal increased at first and then decreased with the increase in fluidization velocity. Solid loading ratios for four kinds of powders decreased with the increase in fluidization velocity. Conveying phase diagrams and pressure drops through different test sections of pulverized coal and biomass at high pressure were obtained and analyzed. The influences of coal category,fracture characteristics and particle size on conveying characteristics were determined.
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Sulfur fate during bituminous coal combustion in an oxy-fired circulating fluidized bed combustor
Lunbo Duan,Wu Zhou,Haixin Li,Xiaoping Chen,Changsui Zhao 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.9
To clarify the sulfur transformation behavior during oxy-fired circulating fluidized bed (CFB) combustion,experiments on SO_2 emission characteristics were carried out in a 50 kWth CFB combustor. Results show that SO_2 emission is quite dependent on the bed temperature in different atmospheres without limestone injection. With Ca/S=2.5, SO_2 emission in 21%O_2/79%CO_2 atmosphere is smaller than that in air atmosphere, but SO_2 emission decreases with the increase of O_2 concentration. The calcium forms in the ash prove the combination of calcination/carbonation and direct sulfation mechanism of limestone under oxy-combustion conditions. And the desulfurization efficiency of limestone (as deducting the self-retention efficiency from the total sulfur removal efficiency) increases from 40% to 52% as the O_2 concentration increases from 21% to 40%.
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Effect of moisture content on dense-phase conveying of pulverized coal at high pressure
Xu Pan,Chen Xiaoping,Liang Cai,Xu Guiling,Liu Daoyin,Zhao Changsui 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.10
In dense-phase pneumatic conveying, the solid moisture content can significantly influence the conveying process, but there are very few studies in the open literature. In this study, the conveying experiments of two pulverized coals with various moisture contents were carried out at a 4MPa high pressure and dense-phase pneumatic conveying facility. Results show that the whole conveying system can be stably and controllably operated under the condition that moisture content below ~8%. With the increase of moisture content up to ~8%, the mass flow rate of 280 μm pulverized coal increases at first and then decreases, while that of 55 μm pulverized coal decreases continuously. The method of solid friction factor correlation is used to investigate pressure drop of the horizontal pipe, and non-dimensional parameters--Fr number, moisture content M and solid loading ratio μ--are investigated. The pressure drop predictions by this correlation are in good agreement with the experimental data. The solid friction factor correlations indicate that the fine coal is more sensitive to M, and μ plays a more important role for the coarse coal.
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