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Study on Numerical Simulation of Brimstone Furnace and Structural Optimization

Author: TangJun
Tutor: HuangYongChun；TongZhangFa
School: Guangxi University
Course: Chemical processes
Keywords: Fuel sulfur furnace Combustion chamber Numerical Simulation Structural optimization
CLC: TS241
Type: Master's thesis
Year: 2008
Downloads: 155
Quote: 1
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Abstract


The burning sulfur furnace is the main equipment used for the preparation of sulfur dioxide gas in the sugar industry. The combustion process of burning sulfur furnace combustion chamber including fluid flow, heat transfer, mass transfer and chemical reaction, and the complex physical and chemical changes in the interaction between them. Over the years, the fuel the sulfur combustion chamber structure optimization design method relies mainly on experience. With the rapid development of the combustion and computational fluid dynamics, numerical simulation of a wide range of applications in the combustion, provides a powerful tool for the structural optimization of the combustion chamber design research. In this paper, the structure of the sulfur burning furnace combustion chamber and sulfur combustion characteristics, to establish a mathematical model of the combustion process burning sulfur furnace combustion chamber. Mathematical model based on the continuity equation, momentum conservation equation, energy conservation equation and component conservation equation for the basis of the control equation, physical models including the standard k-epsilon turbulence model, the general-purpose finite rate / eddy dissipation model, non-premixed The model combustion reaction model, and evaporation discrete items. And set a reasonable boundary conditions and method of solution of the model. Obtained by numerical simulation of the traditional self-fluxing burning sulfur combustion chamber of the combustion process in different excess air coefficient α optimal excess air coefficient α is 1.6, as well as the velocity field in the combustion chamber, the temperature field and the component concentration field. Traditional self-fluxing burning sulfur furnace combustion chamber flow field analysis, the results showed that the uneven mixing of air and gas in its combustion chamber, which leads to burning uneven export gas exist large number S 2 SO 3 . Mole fraction of export gas under the best conditions of α SO 2 mole fraction reached 13.0%, S 2 0.011%, SO 3 mole fraction of 0.088%. In order to verify the feasibility and accuracy of the simulation methods, the simulation results and the actual operating results were compared, the results show that: under the same conditions as boundary conditions, the simulation results and the actual operation results in good agreement with the model of choice is a reasonable, analog The method is reliable. To overcome the traditional self-melting fuel sulfur furnace defects the paper selection whirlwind combustion of sulfur burning numerical simulation study. Vertical cyclone burning sulfur furnace, designed by the combustion characteristics of the cyclone furnace burning 6 tons / day through a vertical cyclone burning sulfur furnace secondary combustion chamber combustion process in different excess air coefficient α numerical simulation was the optimal excess air coefficient α is 1.10, and the combustion chamber in the speed field, temperature field and species concentration field. Through the flow field analysis and numerical simulation method of the structure of the secondary combustion chamber has been optimized to obtain the optimal structure parameters: increase the over-annular combustor (excessive angle of 45 °), mixed gas inlet diameter d 1 for the 0.125 m, the secondary air inlet diameter d 2 is 0.065m, before and after the combustion chamber diameter ratio of 1:0.80, and the secondary air inlet height h of 0.80 m. In the optimal structure parameters under the conditions of the export gas SO 2 S 2 SO 3 mole fraction of 18.8%, 0% 0.0188%. By comparing the simulation results of the traditional self-melting of burning sulfur furnace with vertical the cyclone fuel sulfur furnace combustion process, that: Tornado the vertical burning sulfur furnace combustion chamber gas mix, more complete combustion, the export of gas in S 2 < zero / sub> the minimal SO 3 generated, SO 2 higher concentrations. To achieve the purpose of reducing combustor S 2 SO 3 of the content, thereby improving the optimization design of the SO 2 content.

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CLC: > Industrial Technology > Light industry,handicrafts > Food Industry > Sugar industry > Basic science
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