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Research on Numerical Simulation of 440t/h Circulation Fluidized Bed Boiler

Author: BaiZhiGang
Tutor: YangChen
School: Chongqing University
Course: Power Engineering and Engineering Thermophysics
Keywords: Circulating fluidized bed boiler Numerical Simulation Combustion model NO_x Emission
CLC: TK229.6
Type: Master's thesis
Year: 2008
Downloads: 284
Quote: 2
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Abstract


The circulating fluidized bed boiler with its fuel wide adaptability and high combustion efficiency and low pollutant emissions unique advantages, and to get a wide range of applications. Circulating fluidized bed coal-fired power generation technology in the current and future coal-fired generation remains mainly the case, as a new clean coal burning power generation technology is bound to be more rapid development at home and abroad. At present, the circulating fluidized bed boiler is moving in the direction of large development. The design of large-scale circulating fluidized bed boiler technology and understanding of the operating characteristics of the large-scale circulating fluidized bed boiler, need to understand and master the flow of the furnace combustion, temperature and other conditions, and through traditional test measurement method can only be limited The data, which became an obstacle to large-scale development of circulating fluidized bed boiler, and now the development of theoretical models with the computer and pulverized coal combustion, numerical test to become an important means of another furnace process research and through numerical experiments You can also make up for the deficiencies of the traditional test. Numerical Simulation is a powerful tool for research projects in the gas-solid multiphase flow auxiliary test methods and numerical simulation method, multiple workers East pot DG440/13.7- Ⅱ 2 type circulating fluidized bed boiler combustion The conditions of the calculation and analysis, in order to provide useful guidance on the the boiler optimization of design and operation. The combustion process in the boiler is a very complex turbulent flow and reaction process, which involves three-dimensional turbulence, multiphase, multicomponent flow; heat transfer and convective heat transfer, radiation heat transfer, heat conduction; involves chemical The reactions also includes gas combustion, particulate phase combustion. In this paper, a non-premixed combustion model, volatile gas to simulate turbulent combustion mixture fraction using standard k? Ε turbulence model simulation of gas-solid the gas turbulent transport, radiation and convection furnace combustion using P -1 radiation model, the gas flow field in a non-staggered grid SIMPLE method to solve NS equation solving stochastic trajectory model of solid particles in turbulent diffusion, oxidation process of the volatile content of the particle precipitation and coke particles reaction analog focus particles volatile precipitation process analog Kobayashi model coke combustion process simulation using the power / diffusion controlled reaction rate model, the fuel nitrogen and heat generation of nitrogen is the main consideration for the generation of nitrogen oxides, the method of post processing. The numerical the simulation using FLUENT6.2 calculated. Finally, the calculation results are given intuitive view description and qualitative analysis. View describes the flow of the furnace, the temperature distribution; distribution of the concentration of oxygen, carbon dioxide and carbon monoxide; the trajectory of the fuel particles; to the impact and distribution of the coal particle size of the combustion; emissions of nitrogen oxide (NO), by controlling the wind speed and Adding a reducing material to create a reducing atmosphere in the furnace thereby controlling emissions of NO. The results of numerical simulation is correct trend, in line with the mechanism analysis, this paper studies the content of the circulating fluidized bed combustion process mechanism analysis and design and operation of certain guiding significance and reference value.

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Various types of boilers > Coal-fired boilers
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