电厂母管制烟道压力分布特性研究及指导系统构建  

Study on pressure distribution characteristics of main-pipeline flue in power plants and construction of guidance system

作　　者：陈茁 钟文琪[1] 陈曦[1] 赵东晓[2] 孙玉芬 Chen Zhuo;Zhong Wenqi;Chen Xi;Zhao Dongxiao;Sun Yufen(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Thermal Power Plant of Sinopec Group Yangzi Petrochemical Co.,Ltd.,Nanjing 210048,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096 [2]中国石化扬子石油化工有限公司热电厂,南京210048

出　　处：《东南大学学报（自然科学版）》2021年第6期1049-1059,共11页Journal of Southeast University：Natural Science Edition

基　　金：国家重点研发计划资助项目(2017YFB0601805).

摘　　要：为降低多锅炉共用脱硫塔燃煤电站因增压风机跳停引发的连锁风险,采用CFD数值模拟与集总参数建模相结合的方法建立了母管制烟道系统的数理模型,得到增压风机排出烟气量、锅炉排出烟气量以及风机跳停对母管制烟道压力分布的影响规律,并在此基础上采用MATLAB构建了母管制烟道在线运行指导系统.结果表明:母管两端增压风机跳停会导致其相近管段压力提升更为剧烈;提升增压风机转速及降低锅炉负荷能够有效降低烟道系统压力,且对其相近管段及空预器出口压力的作用最为显著;当某增压风机跳停时,优先提高临近增压风机转速能够更大程度降低烟道系统压力;与CFD模型相比,所构建指导系统的计算时长降低至小于4.6 s,满足了现场运行人员准确预测烟道压力波动和实时调控烟气流量分配的需求.To reduce the chain risk caused by the booster fan tripping in coal-fired power plants with multiple boilers sharing desulfurization towers,a mathematical model for the main-pipeline flue system was established by a combination of the computational fluid dynamics(CFD)numerical simulation and the lumped parameter modeling.The influence law of the exhaust gas volume of the booster fan,the gas volume discharged from the boiler and the fan tripping on the pressure distribution of the main-pipeline flue system was obtained.On this basis,the online operation guidance system of the main-pipeline flue system was built by the using of MATLAB.The results indicate that the trip of the booster fans at both ends of the main pipe causes a more drastic pressure increase in adjacent pipe sections.The pressure of the flue system can be effectively reduced by increasing the speed of the booster fans and reducing the boiler load,and it has the most significant effect on reducing the pressure of the adjacent flue and the air preheater outlet.When a booster fan trips,giving priority to increasing the speed of adjacent booster fans can reduce the pressure of the flue system to a greater extent.Compared with the CFD model,the calculation time of the guidance system is less than 4.6 s,basically meeting the needs of the site operators to accurately predict the flue pressure fluctuation and adjust the flue gas flow distribution in real time.

关 键 词：母管制烟道 数值模拟 烟气脱硫 风机跳停 

分 类 号：TM621.7[电气工程—电力系统及自动化] TK223.6[动力工程及工程热物理—动力机械及工程]