岑可法
洁净燃烧与气化技术、工业、农业及生活废弃物的资源化能源化利用、能源与环境系统工程、工程气固多相流动和电站锅炉计算机辅助试验(CAT)等领域
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- 姓名:岑可法
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学术头衔:
博士生导师,
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学科领域:
动力机械工程
- 研究兴趣:洁净燃烧与气化技术、工业、农业及生活废弃物的资源化能源化利用、能源与环境系统工程、工程气固多相流动和电站锅炉计算机辅助试验(CAT)等领域
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843
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成果数
10
岑可法, 周昊, 樊建人, 池作和, 蒋啸
Proceedings of the CSEE, 2003, (1): 132~135,-0001,():
-1年11月30日
煤粉浓淡分离燃烧技术在低负荷稳燃、降低燃烧污染物排放等方面具有良好性能,得到广泛应用。由于四角切圆燃烧锅炉粉管布置要求,燃烧器前往往布置有弯头,弯头出口存在煤粉空气混合物速度和煤粉浓度分布的不均。该文采用试验和数值模拟方法,对一次风煤粉空气混合物流经弯头后形成的气、粉分布不均对浓淡分离器的工作特性的影响进行分析。试验和模拟结果表明,弯头结构和布置形式对煤粉浓淡分离器的分离效果、浓淡侧速度分布不均等都有重要影响。文中同时提出了具有前置弯头的浓淡分离器获得高分离效果及浓淡侧速度均衡的途径,为浓淡分离器的设计和运行提供参考。
浓淡燃烧, 数值模拟, 气固多相流, 弯头
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【期刊论文】不同温度下炉内喷射氨水脱除NOX的模拟与试验研究
岑可法, 王智化, 周昊, 周俊虎, 樊建人
JOURNAL OF FUEL CHEMISTRY AND TECHNOLOGY, 2004, (2): 48~53,-0001,():
-1年11月30日
在一台小型沉降炉上进行了氨水喷射还原烟气中NOX的SMCR(Selective Non-Catalytic Reduction)实验研究, 同时结合化学反应动力学模型研究了NH3还原NO过程中的关键影响因素,结果发现,过高的温度引起氨水的氧化, 过低的温度不利于NO 的还原,存在一个单一的温度区间,在该试验台上最佳的氨水喷射温度范围为850℃~1100℃,最高达到了82%的NO还原率;采用均相反应模型与试验结果进行了对比,在高温区吻合情况较好;当温度高于950℃时,NH3残留量可以忽略;NH2的两类支链反应对于整个反应起重要作用。
氨水, SNCR, NOX, NH3/, NO摩尔比, NH3
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97浏览
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276下载
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【期刊论文】A numerical model for dense particle-laden jets
岑可法, J.R. Fan*, J. Jin, X.Y. Zhang, K.F. Cen
Powder Technology 115(2001)256-264,-0001,():
-1年11月30日
A new approach has been developed for the study of dense gas-solid flows. The approach uses Eulerian and Lagrangian coordinates and takes account of inter-particle interactions. A numerical algorithm is presented and a dense, circular, particle-laden jet has been simulated numerically using the new model. Comparison of the calculations with published experimental data shows satisfactory agreement.
Eulerian/, Lagrangian model, Dense particle flows, Downward jets
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87浏览
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岑可法, S.-Q. Li a, b, *, Y. Chi a, R.-D. Li a, J.-H. Yan a, K.-F. Cen a
Powder Technology 126(2002)228-240,-0001,():
-1年11月30日
A novel particulate trajectory model (PTM) is developed to predict axial transport and dispersion of municipal solid wastes (MSW), based on the vector analysis on particle's gravity-induced axial displacement in a single excursion. Three parts of work are extended with respect to this PTM. First, the simplified formulas about mean residence time (MRT) and material volumetric flow (MVF) are derived by incorporating statistic-averaged analysis on all repeated excursions of solids within kiln into PTM. The correctional factors-et for MRT and ef for MVF-are introduced to improve the model's validity under such practical cases, i.e. irregular MSW existence or internal-structure presence. Reasonable agreement is obtained between the empirical formulas and experiments with correlation factor in excess of 90% for all runs. Second, a stochastic PTM is extended to predict the residence time distribution (RTD) curves of segregated MSW by considering the probability of the rolling distance of individual particle. As for MSW, the main cause of axial dispersion is the egregation of rolling distance of solids, due to variation of MSW components, shapes and sizes. Finally, the optimization model for geometry design of a laboratory-scale rotary kiln pyrolyser of MSW is presented and the corresponding optimum solutions are provided.
Rotary kiln, MSW, Axial transport, Particulate trajectory model, Optimization
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98浏览
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1541下载
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【期刊论文】Prediction of ash deposition in ash hopper when tilting burners are used
岑可法, Zhou Hao *, Cen Kefa, Sun Ping
Fuel Processing Technology 79(2002)181-195,-0001,():
-1年11月30日
This work presents a model of ash deposition growth in the ash hopper of utility boilers when the nozzles are tilted downwards. The model consists a comprehensive combustion code to predict the flow field, temperature field, the gas and solid combustion and the deposition growth behavior. The results show that burner tilting has a significant effect on the deposition in the ash hopper. The work indicates that the numerical model can be used to optimize the design and operation of pulverized coal-burning boiler equipped with tilting burner systems.
Pulverized coal fired, Tangentially fired furnace, Ash slag, Deposition growth
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73浏览
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566下载
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【期刊论文】Sulfur removal at high temperature during coal combustion in furnaces: a review
岑可法, Jun Cheng*, Junhu Zhou, Jianzhong Liu, Zhijun Zhou, Zhenyu Huang, Xinyu Cao, Xiang Zhao, Kefa Cen
Progress in Energy and Combustion Science 29(2003)381-405,-0001,():
-1年11月30日
This paper focuses on sulfur removal technologies in industrial grate furnaces (IGF) and pulverized coal fired boilers (PCFB) with high flame temperature of 1200-1600 ℃. The SO2 reduction without sorbents during coal combustion, thermal stabilities of sulfation products, kinetics of sulfur retention reactions of sorbents, desulfurization processes, and sulfur removal under unconventional atmospheres at high temperature are reviewed. It is proposed that some powdered minerals or industrial wastes with effective metal components may be used as sorbents for sulfur removal to promote cost effectiveness. Because the main reason that results in low desulfurization efficiencies in IGF and PCFB is the thermal decomposition of the conventional sulfation product CaSO4 above 1200 8C, it is key to explore new sulfation products that are thermally stable at high temperatures. It is also necessary to study the kinetic catalysis of alkali and transitional metal compounds on sulfation reactions under the combustion conditions of IGF and PCFB. The two-stage desulfurization process, in which SO2 is captured by sorbents both in the coal bed and the combustion gas, is promising for IGF, especially with the humidification of flue gas in a water-film dust catcher. The staged desulfurization process combined with air-staged combustion, in which sorbents are injected into the primary air field and upper furnace to capture SO2 under reducing and oxidizing atmospheres, is promising for PCFB. Flue gas recirculation is also an effective desulfurization process under O2/CO2 conditions and can give a high desulfurization efficiency of about 80% in furnaces.
Sulfur removal, High temperatures, Coal combustion, Industrial grate furnaces, Pulverized coal fired boilers
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83浏览
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188下载
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【期刊论文】Particle population balance model for a circulating fluidized bed boiler
岑可法, Qinhui Wang*, Zhongyang Luo, Mingjiang Ni, Kefa Cen
Chemical Engineering Journal 93(2003)121-133,-0001,():
-1年11月30日
A two-dimensional particle population balance model has been developed for the particle size and density distributions in a circulating fluidized bed (CFB) boiler furnace based on analysis of particle properties and the core-annulus hydrodynamic model. The model, incorporating modules to consider fuel particle fragmentation, char combustion, particle attrition and gas-solid separation, is part of an overall model developed earlier by the authors to simulate the operation of a 12MW CFB boiler. The model predictions for particle population in a CFB furnace agree well with the measurement data.
Circulating fluidized bed boiler, Particle population balance
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95浏览
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578下载
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岑可法, Jianren Fan, , * Kun Luo, Youqu Zheng, Hanhui Jin, and Kefa Cen
PHYSICAL REVIEW E 68, 036309 (2003),-0001,():
-1年11月30日
Large-scale vortex structures and their effects on the dispersion of particles in turbulent free shear flows are very important in many industrial applications, such as combustion, pollution control, and materials processing. In order to understand large-scale vortex structures and particle dispersion in depth, as well as their interaction effects, a two-way-coupled three-dimensional mixing layer laden with particles at a Stokes number of 5 initially located in the upper half region is studied numerically. A pseudospectral method was used to directly simulate the flow fluid, and the Lagrangian approach was used to trace particles. The concept of computational particles is introduced to vary the mass loading of particles. The momentum coupling effect introduced by a particle approximates to a point force. The simulation results show that coherent structures are still dominant in the mixing layer, but the flow dynamics and particle dispersion are modulated. The length of large-scale vortex structures is shortened and the pairing is delayed. Higher mass loading results in lower energy of the fluid in the phase of Kelvin-Helmholtz rolling up, while in the pairing process of large-scale vortex structures, the energy of the fluid increases as the mass loading increases. Higher mass loading also leads to larger mixed fluid thickness and Reynolds stresses of the flow. In addition, the particle dispersion along the transverse direction differs from that along the spanwise direction, which indicates that the effects of the addition of a particle on the spanwise large-scale vortex structures are different from those on the streamwise large-scale vortex structures.
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82浏览
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【期刊论文】Optimizing pulverized coal combustion performance based on ANN and GA
岑可法, Zhou Hao a, *, Xinping Qian b, Kefa Cen a, Jianren Fan a
Fuel Processing Technology 85(2003)113-124,-0001,():
-1年11月30日
In this work, an effective method based on artificial neural network (ANN) and genetic algorithms (GA) is suggested for modeling the carbon burnout behavior in a tangentially fired utility boiler and optimizing the operating conditions to achieve the highest boiler heat efficiency consecutively. When carbon burnout behavior under various operating conditions are experimentally investigated, the comparison between the output of ANN modeling and the experimental data shows satisfactory agreement. A genetic algorithm is employed to perform a search to determine the optimum solution of the neural network model, identifying appropriate setpoints for the current operating conditions.
Neural network, Genetic algorithms, Coal combustion, Carbon burnout
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71浏览
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岑可法, Hao Zhou*, Kefa Cen, Jianren Fan
Energy 29(2004)167-183,-0001,():
-1年11月30日
The present work introduces an approach to predict the nitrogen oxides (NOx) emission characteristics of a large capacity pulverizedcoal fired boiler with artificial neural networks (ANN). The NOx emission andcarbon burnout characteristics were investigatedthroug h parametric fieldexperi ments. The effects of over-fire-air (OFA) flow rates, coal properties, boiler load, air distribution scheme and nozzle tilt were studied. On the basis of the experimental results, an ANN was used to model the NOx emission characteristics andthe carbon burnout characteristics. Comparedwi th the other modeling techniques, such as computational fluid dynamics (CFD) approach, the ANN approach is more convenient and direct, and can achieve good prediction effects under various operating conditions. A modified genetic algorithm (GA) using the micro-GA technique was employedto perform a search to determine the optimum solution of the ANN model, determining the optimal setpoints for the current operating conditions, which can suggest operators' correct actions to decrease NOx emission.
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72浏览
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