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《Journal of Engineering for Thermal Energy and Power》 2007-02
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Dynamic Simulation and Forecast of "Boiler Implosion"

ZHAO Zhen-zhou,JIN Bao-sheng,XIONG Yuanquan(Education Ministry Key Laboratory on Clean Coal Power Generation and Combustion Technology,Thermal Energy Engineering Research Institute under the Southeast University,Nanjing,China,Post Code: 210096), SUN Ke-qin(Jiangsu Suyuan Environmental Protection Project Stock Co.Ltd.,Nanjing,China,Post Code: 210024)  
The pressure fluctuations caused by a boiler implosion can affect the whole boiler flue gas and air system.Up to now,no relevant literature concerning threedimensional numerical simulation of boiler flue gas and air systems has been found in China.To study the boiler implosion,a dynamic mathematical model has been established.Based on a CFD(computational fluid dynamics) software platform,a numerical simulation of boiler flue gas and air system as well as coal feed cut-off and fire extinguishing process has been conducted for the first time.For the following three operating regimes,i.e.at the time of 0.3 s,0.5 s and 1 s after stopping the feed of coal,a simulation calculation has been performed.Through an analysis and comparison of calculation results of the three operating regimes,the authors conclude that the speed of coal feed stop off to a boiler has a great impact on boiler implosion.The quicker the coal-feed cut-off to the boiler,the greater the possibility that a boiler implosion may happen.If all parts in a boiler are designed to have a same maximum pressure bearing capacity,it is most likely for the implosion to take place in the furnace.In the meantime, the process of change in pressure and temperature at the time of 0.01 s and 1.5 s after stopping coal feed was also calculated and compared.The analysis leads to a conclusion that apart from a temperature drop,the boiler implosion may cause a quick decrease of RO2 after a fire extinguishing and it is also an important factor contributing to pressure fluctuations in furnace and the quicker the coal feed is stopped to a boiler,the less will be the effect of temperature.
【CateGory Index】: TK221
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