摘要
降低厂用电是提高循环流化床(CFB)锅炉性能的重要方面。分析了降低无效床料存量、提高有效床料存量、维持上部快速床的流态重构的物理基础,揭示了流态重构的本质是改变床存量的颗粒粒径分布,进一步明确了流态重构不是通过排渣,而是通过提高分离器效率、循环量及床质量来实现。在75~220 t/h CFB锅炉验证的基础上,开发了560 t/h流态重构CFB锅炉,根据流态重构的要求,进行部件设计。2年的运行实践表明:锅炉运行稳定,流化质量很好,物料循环系统性能优异,实现了流态重构,送风机电耗显著减少;主要参数与设计值吻合,热效率超过92%,NO_(x)原始排放低于50 mg/m^(3)。
To decrease the electric power consumption of the circulating fluidized bed(CFB)boiler auxiliaries plays an important role in improving the performance of a CFB boiler.This paper analyzed the physical basis of the fluidization pattern reconstruction of a CFB boiler by decreasing the noneffective bed material inventory and increasing the effective bed material inventory to maintain the fast bed at the upper part.Therefore,it was clarified that the essence of fluidization pattern reconstruction of the CFB boiler was to change the bed particle size distribution,and it was realized by improving the collection efficiency of cyclone as well as the circulating flow rate and bed quality,rather than bottom ash discharging.This idea was proved by the success of 75~220 t/h CFB boilers,which provided successful experience,the 560 t/h CFB boiler was developed,of which the key parts were designed according to the request of fluidization pattern reconstruction.The two-year operation practice showed that the boiler ran stably with perfect fluidization and excellent material circulation system performance,realizing the fluidization pattern reconstruction and lower electric power consumption of forced draft fans.The major parameters of the boiler agreed well with the design one,with the thermal efficiency of more than 92%and the original NO_(x) emissions of less than 50 mg/m^(3).
作者
陈书洁
尚曼霞
张缦
杨海瑞
吕俊复
CHEN Shujie;SHANG Manxia;ZHANG Man;YANG Hairui;LYU Junfu(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)
出处
《锅炉技术》
北大核心
2021年第4期25-29,共5页
Boiler Technology
基金
山西省科技重大专项资助项目(20181102001)。
关键词
循环流化床
流态
重构
560
t/h
节电
circulating fluidized bed
fluidization pattern
reconstruction
560 t/h
electricity saving
作者简介
陈书洁(1997-),女,博士研究生,主要从事循环流化床燃烧理论与技术研究。
