宽负荷下灵活二次再热超超临界锅炉调温特性研究  

Study on Steam Temperature Regulation Characteristics in Flexible Ultra-supercritical Boiler with Double Reheat Cycle under Wide Loads

作　　者：许威 张剑[1] 范浩杰[1] 张忠孝[1] 孙蔚婷 XU Wei;ZHANG Jian;FAN Haojie;ZHANG Zhongxiao;SUN Weiting(Institute of Thermal Energy Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学热能工程研究所

出　　处：《中国电力》2019年第4期119-126,共8页Electric Power

基　　金：国家重点研发计划资助项目(2017YFB0602102)~~

摘　　要：建立了二次再热锅炉的分室热力计算模型,并通过炉内髙温受热面的对流传热量对炉膛出口烟气温度计算式进行修正,以国内某660MW二次再热锅炉对模型进行验证。利用模型分别研究了摆动燃烧器、烟气挡板调节及烟气再循环对主汽温、一次和二次再热汽温的影响,得到了3种蒸汽的温度随不同调温方式变化的特性曲线。结果表明:主汽温对烟气再循环率的变化较敏感,烟气再循环率每增加1%,主汽温降低0.8℃;再热蒸汽温度对烟气挡板调节较敏感,前烟井挡板开度每增加1%,一次再热蒸汽温度上升1℃,二次再热蒸汽温度降低1.7℃。A cell-divided model of double-reheat boilers for thermodynamic calculation is established, in which the formula of the gas temperature at the furnace outlet is revised by using the convective heat volume of high temperature heating surfaces in the furnace. The model is validated on a domestic 660 MW double-reheat boiler. Based on this model, the impacts of tilting burners, adjustment of gas dampers and gas recirculation on the steam temperatures are studied, and the characteristic curves of the steam temperature change with respect to various regulating methods are obtained. From the results it turned out that the main steam temperature is more sensitive to gas recirculation. For every 1 % jump of the recirculation rate, the main steam temperature drops by 0.8 °C. Besides, the reheat steam temperatures are more sensitive to gas damper adjustment. For every 1% increase of the damper opening in front flue, the primary-reheat steam temperature rises by 1 °C, while the secondary-reheat steam temperature drops by 1.7 °C.

关 键 词：燃煤电厂 二次再热锅炉 热力计算模型 汽温特性 摆动燃烧器 烟气再循环 烟气挡板 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]