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Study on the Optimizationof Blend Coal Combustion of a 1025t/h Boiler

Author: FengCheng
Tutor: XiangJun；ZhouYingBiao
School: Huazhong University of Science and Technology
Course: Thermal Power Engineering
Keywords: Mixed coal combustion characteristics Thermal gravimetric analysis Mixed coal ratio Numerical Simulation The double mixture fraction probability density function
CLC: TK227.1
Type: Master's thesis
Year: 2009
Downloads: 71
Quote: 0
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Abstract


China's energy structure dominated by coal , and the vast majority of domestic large power plants fueled with coal deviated from the design value , leading to a series of questions in plant operation . To solve these problems , at home and abroad many solutions . Steam coal blending technology and combustion adjustment operability , the effect of significantly lower cost , and has been widely used at home and abroad . These two methods are mutually influence and constraints, therefore , if the two methods can be carried out overall optimization of the actual run there will be a great help . The paper attempts to optimization of mixed coal ratio based on the use of numerical simulation methods to optimize combustion adjustment . Research on coal combustion characteristics of steam coal blending . Paper commonly used in the coal Zhanjiang Power Plant and its mixed coal as an object of study , through its combustion characteristics of experimental data analysis , and considering coal price factors , the fuzzy mathematical methods to determine the best ratio of the different mix of coal . Blended coal combustion in order to select a more accurate model simulation , the paper uses a single , the double mixture fraction probability density function of two methods of on-site conditions . The comparison field thermal test results show that the two methods can more accurately reflect the operational characteristics of the boiler ; analysis of the two methods of calculation results show that the dual mixed scores more accurately reflect the mixed coal combustion characteristics . Through the combustion adjustment to improve boiler combustion condition is commonly used in the actual running of power plants . Thesis coal characteristics different design, with the wind . Numerical simulation tools to study the the unit thermal characteristics and pollutant emission characteristics with wind , and The unit is fueled with different characteristics of the two showed mixed coal optimize the analysis and comparison of different coals burning with wind way , to provide a theoretical basis for the field operation . This study shows that : AIR DISTRIBUTION centralized can improve the ignition and burnout characteristics , to ensure the efficiency of the boiler combustion ; inverted pagoda with the wind can enhance the effect of staged combustion can reduce NO emissions ; against different coal and operational requirements , combustion adjustment should design a different way .

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Run > Combustion and adjustments
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