摘要
针对某厂300 MW循环流化床燃煤机组四分仓回转式空预器内两股一次风难以单独调控的问题,提出了空预器一次风区域添加密封隔板改造为五分仓的技术方案,采用CFD方法模拟了四分仓和五分仓空预器内温度场变化特征。通过与电厂实际运行的四分仓空预器烟气和空气出口平均温度对比,验证了所选择模型的合理性及计算方法的有效性。模拟结果表明:工质温度沿旋转方向降低,而沿空气流动方向升高;空预器改造为五分仓后,烟气侧冷段入口和出口的温度均有所提高,降低了硫酸蒸汽在蓄热元件壁面凝结的风险,进而减小了该设备低温腐蚀和积灰的可能性,转子蘑菇状变形随着该设备冷热端温差降低而减弱,漏风量随着转子与扇形密封板之间间隙减小而有所降低。
In order to independently control two parts of primary air in the air preheater of circulating fluidized-bed power generation with the capacity of 300 MW,a technical proposal is suggested to add the sealed baffle in the primary air area of quad-section,accordingly the rotary air preheater is transformed into quin-section.The profiles of temperature fields are numerically simulated in both quad-section and quin-section air preheaters.CFD model and simulation method are verified by compared numerical data with the average outlet temperatures of both flue gas and air from the operational quad-section air preheater.The CFD results show that the temperature of working fluid decreases along the rotating direction and increases along the direction of air flow.When the rotary air preheater is retrofitted from four sections into five sections,the flue gas temperatures are increased at the inlet and outlet of cold section,which could reduce the risk of sulfuric acid vapor condensing on the heat storage element,thus the low-temperature corrosion and ash deposition are alleviated.Meanwhile,the mushroom-shaped deformation of the air preheater rotor decreases with the reduction of the temperature difference between the cold and hot ends of the rotor,and the leakage is mitigated as a result of the decrease of the gap between the rotor and the fan-shaped seal plate.
作者
侯益铭
王艺璨
刘红刚
路建洲
曲江源
张锴
HOU Yiming;WANG Yican;LIU Honggang;LU Jianzhou;QU Jiangyuan;ZHANG Kai(Shanxi International Energy Group Co.,Ltd.,Taiyuan 030006,China;Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation,North China Electric Power University,Beijing 102206,China;Shanxi Pingshuo Gangue-fired Power Generation Co.,Ltd.,Shuozhou 036800,China)
出处
《电力科学与工程》
2019年第9期56-63,共8页
Electric Power Science and Engineering
基金
国家科学自然基金资助项目(U1610254)
中央高校基本科研业务费专项资金资助项目(2017MS020,2018ZD03)
关键词
回转式空气预热器
四分仓
五分仓
温度场
低温腐蚀
积灰
漏风
rotary air preheater
quad-section
quin-section
temperature field
low temperature corrosion
ash deposition
leakage
