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Numerical Simulation Research on Coal Combustion Lixia Ren1, a, Hongwei Lu1, b, Peng Du1, c 1Sino-Canada Resources and Environmental Research Academy, North China Electric Power University, Beijing, 102206, China arenlixia381173896@163.com, bluhw@ncepu.edu.cn, cpengdu52008@163.com Keywords: Pulverized coal, Combustion, Numerical simulation Abstract.
The comparative study of numerical results on pulverized coal combustion process with CFD has become an important measure for direct engineering practice.
The simulation results showed that the rules of the volatile releasing and combustion processes of coke could provide important references to improve the combustion of the pulverized coal.
Numerical simulation for coal combustion Simulating objects In this paper, a combustion facility was simulated numerically with the Fluent code to investigate the process of coal combustion, by introducing a mixture of pulverized coal and hot air stream.
In summary, the simulation results showed that the reference conditions could be helpful for the study of desulfurization and denitrification by analyzing correlative factors in pulverized-coal-fired systems.

During the simulation, the density of particles takes 1000kg/m3.
Simulation of Particles In this study, The Lagrangian particle transport model was used to track particle movement.
So in the simulation, the number of particles that hit the incisions was considered as one of the evaluation index.
Incisions Layout The simulation results are shown in tableⅤ.
[5] Jelena Srebric, Vladimir Vukovic, Guoqing He, and Xudong Yang, “CFD boundary conditions for contaminants dispersion, heat transfer and airflow simulations around human occupants in indoor environments,” Building and Environment, vol. 43, no. 3, pp. 294~303, March 2008.

CFD simulation.
Numerical wind tunnel technology (CFD technology) is a method for simulating changes in the surrounding wind field base on fluid dynamics and solving wind load on the surface of building.
Numerical Simulation Model.
In the crosswind surface corner, like 10, 11, 12 present the numerical simulation results to be small, the measuring point 20, 21, 22 numerical simulation results are big.
(3) Standard model exist a certain error, for improving simulation precision, must be further improved.

CFD analysis model and conditions In fluid dynamics field, some difficult problems by experimental or theoretical methods can be solved by the use of CFD analysis.
Fig. 1 shows the CFD model for working fluid area to be analyzed.
The simulations of fluid flow were done by a finite volume method as a three dimensional, unsteady turbulent flow.
They prove its high accuracy of our built CFD simulation model [8-9].
[8] Wilcox D C, Turbulence Modeling for CFD, 2ed., DCW Industries, La Canada, 2002

The simulation showed a complex 3D flow pattern around the buildings.
This can be investigated by either physical models using a wind tunnel or numerical models using computational fluid dynamics (CFD) methods.
In addition, CFD simulations can provide detailed information of the wind flow field around the buildings under various conditions [6].
The CFD simulations can help to better plan urban areas by improving the wind environment around buildings via natural air ventilation.
This was confirmed by comparing the current simulations with the simulations of a prior study with buildings of the same height.

Therefore, pure experiential designing method is inadequate, and a wind-tunnel model or computer simulation is preferred.
Presently the software simulation technology has gradually become a mature aiding analysis tool for layout design.
In order to provide technical evidence for residential districts environment design, the results of sunlight analysis and winter CFD simulation are integrated to make a comprehensive consideration.
CFD Simulation Results for a Dandong high-rise residential district Scheme Version Site layout and simulation result Scheme 1 The high-speed wind channel through the residence formed by the north entrance and inner roads.
To solve this problem, the analyzing process can be carried out in such steps as scheme design—CFD simulation—scheme revision.

In this paper, in considering the influence of interaction and material decomposition, the generation of NOx inside the rotary kiln and precalciner, which are the main NOx emission equipments in cement production process, are simulated by CFD technology, and the results is tally with the actual situation.
Numerical simulation of NOx formation in rotary kiln.
Numerical simulation of NOx formation in precalciner.
But these question can be easily solved by using numerical simulation.
By using CFD technology, complete the numerical simulation of NOx formation in rotary kiln, and prove that the generation of NOx in rotary kiln is mainly thermal NOx; 2).

Currently, the way to know the wind load both home and abroad includes field measurement, wind tunnel test simulation and computer analogue simulation.
Based on the existing research findings and by taking assembled steel truss bridge as the research object, the method of computational fluid dynamics (CFD) is used to make numerical simulation for the stochastic wind field.
Governing equation and numerical method Computational Fluid Dynamics (CFD) is the analysis made to the system of physical phenomenon including fluid flow and heat conduction by means of computer numerical calculation and image display.
Based on correlation theory and method of CFD, the workflow of the numerical simulation of the stochastic wind field of assembled steel truss bridge is shown in chart 1.
Analysis of Computational Fluid Dynamics- Calculation Principle and Application of CFD Software [M].

Y-shaped tee is modeled by three-dimensional graphics software and its flow field is analyzed and numerical simulated by CFD software.
Simulation results are consistent to the practice, which provides important theoretical basis for improving and optimization of Y-shaped tee.
By the using of CFD software, the geometric model of Y-shaped tee is meshed.
With the case studied in this essay, it is thus clear that the method of simulation analyzing of fluid-structure coupling for Y-shaped tee is feasible by using CFD software.
It can be popularized in the other flow field simulation analysis.

Flow and Heat-transfer Simulation Based on CFD and Experimental Study during High-Pressure Gas Quenching Zhijian Wang 1,a and Xiaofeng Shang 1,b 1 School of Mechanical and Electrical Engineering, Shenyang Aerospace University, Shenyang Liaoning, China, 110136 awangzhijian1974@sina.com, bxfshang@vip.sohu.com Keywords: High-pressure gas quenching, CFD, Flow and heat transfer, Temperature field, Flow field.
The hot wire anemometer is used to measure the inlet velocities of nozzles, which provides the boundary conditions for computer simulation.
By the computer simulation, the gas flow fields, work temperature fields and work cooling curves are attained.
Computational Fluid Dynamics (CFD) has been an important method to study the complex gas flow and heat exchange during high pressure gas quenching.
Figure 3 shows the simulation result of the velocity vector in Y = 0 section.