褐煤锅炉燃用烟煤的数值研究  

Research on the fuel substitution of lignite for soft coal with numerical method

作　　者：李罡[1] 闫承先 束继伟 黄启龙 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150006 [2]黑龙江省电力科学研究院,黑龙江哈尔滨150030

出　　处：《黑龙江电力》2003年第4期251-256,共6页Heilongjiang Electric Power

摘　　要：应用K-ω双方程湍流模型和双流体模型对某厂670t/h六角切圆燃烧锅炉炉内空气动力场和气固两相流场进行了数值模拟。安排了与工业试验对应的燃用褐煤工况和改烧烟煤可能出现的工况,得到了炉内气相速度矢量场、静压力分布、湍流动能分布、气固两相的速度矢量场和颗粒相浓度分布等,分析了在不改变锅炉整体结构和布置的基础上改烧当地烟煤的可行性。通过对比发现,当燃用烟煤1、2、4、5号磨煤机投入运行时,角部二次漩涡较小,炉膛上部颗粒浓度相对集中于炉膛中心,适合于锅炉的经济运行。工业试验也表明,改烧烟煤后,锅炉效率提高1.39％,排烟温度降低10℃,主蒸汽参数、再热蒸汽参数、各段烟风参数和汽水参数无明显变化。Applied K-ε double equations model and double - fluid model to simulate the aerodynamic field and air - particle fluid field of a 670 t/h boiler of a certain power plant . Arranged several possible contrast to the relative industrial test of substitution of lighite for soft coal. Obtained the distribution of air - fluid velocity vector,static pressure,kinetic energy of the turbulence^ air and particle velocity vector, analysised the possibility of the fuel stubstitation without changing its coustruction. From the contrast, discoverd that , when using No1,2,4,5mill,the secondery vortex was small,the particle concentration at the top of the furnace was relatively concertrated at the centre of the furnace it was suitable for the economic performance of the boiler. The industrial application showed that,after the fuel substitution,the efficiency was increased by 1. 39% ,the exhaust gas temperature was reduced by 10℃,the parameters of the main steam,reheated steam, air and gas of all sections or steam and water didnt have any obvious change.

关 键 词：锅炉 数值研究 六角切圆 褐煤 烟煤 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]