超临界锅炉低负荷运行水动力及壁温特性分析  

Analysis of Hydrodynamic Force and Wall Temperature Characteristics of a Supercritical Boiler Under Low Loads

作　　者：曹霆 郑沧海 李永利 王熠伟 秦宁 柏战国 刘杰 张磊 邓磊[4] CAO Ting;ZHENG Canghai;LI Yongli;WANG Yiwei;QIN Ning;BAI Zhanguo;LIU Jie;ZHANG Lei;DENG Lei(CHN Energy Taicang Electric Power Co.,Ltd.,Taicang 215433,Jiangsu Province,China;CHN Energy Jiangsu Power Co.,Ltd.,Nanjing 210000,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]国能太仓发电有限公司,江苏太仓215433 [2]国家能源集团江苏电力有限公司,南京210000 [3]上海发电设备成套设计研究院有限公司,上海200240 [4]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《动力工程学报》2024年第11期1680-1688,1711,共10页Journal of Chinese Society of Power Engineering

摘　　要：为探究燃煤锅炉的深度调峰能力,针对某超临界630 MW锅炉炉膛水冷壁开展了水动力和壁温特性研究,建立了水动力和壁温特性数学模型,计算并分析了(20%~30%)锅炉最大连续蒸发量(BMCR)负荷的水冷壁压降、流量分配、出口工质温度和壁温沿炉高方向的分布特性等。结果表明:在20%和30%BMCR负荷,水冷壁螺旋管段的热偏差较小,热负荷分布均匀,水冷壁垂直管段出口蒸汽温度偏差较大,该区域更易出现温度超限的情况;在30%BMCR负荷时,锅炉可以以干态工况安全运行;在28.8%BMCR负荷时,水冷壁入口工质温度为280.0℃,锅炉干态运行时水冷壁壁温最高值超过450.0℃;在27.3%BMCR负荷时,锅炉干态运行时水冷壁壁温最高值超过500.0℃,此时可以通过转湿态运行或调节入口温度的方式降低壁温。To explore the deep peak shaving capacity of coal-fired boilers,the hydrodynamic force and wall temperature characteristics of the water-cooled wall of a supercritical 630 MW boiler were studied.Mathematical models of the hydrodynamic force and wall temperature characteristics were established,and water-cooled wall pressure drop,flow distribution,outlet working substance temperature and wall temperature distribution along the furnace height between 20%and 30%boiler maximum continuous rating(BMCR)loads were analyzed.Results show that,the helical tube sections of the water-cooled wall exhibit small thermal deviation and uniform heat load distribution under 20%and 30%BMCR loads.The outlet steam temperature deviation of the vertical tube sections of the water-cooled wall is large,and the over-temperature is more likely to occur in this area.Under 30%BMCR load,the boiler could operate safely in dry state condition.Under 28.8%BMCR load,the inlet water temperature of the water-cooled wall is 280.0℃,and the maximum wall temperature of the water-cooled wall in dry state condition exceeds 450.0℃.Under 27.3%BMCR load,the maximum wall temperature of the water-cooled wall in dry state condition exceeds 500.0℃,and the boiler should operate in wet state condition or the wall temperature should be reduced by adjusting the inlet water temperature.

关 键 词：超临界锅炉 深度调峰 水冷壁 水动力 壁温 

分 类 号：TK172[动力工程及工程热物理—热能工程]