粉煤循环流化床锅炉0~1 mm制粉系统开发与热力计算方法  

Development and thermal calculation method of 0−1 mmpulverizing system for powdered coal-circulating fluidized bed boiler

作　　者：尚曼霞 姚禹歌 柯希玮 周托 黄中 SHANG Manxia;YAO Yuge;KE Xiwei;ZHOU Tuo;HUANG Zhong(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《中南大学学报（自然科学版）》2024年第4期1560-1566,共7页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2022YFB4100301)。

摘　　要：为实现粉煤循环流化床(powdered coal-circulating fluidized bed,PC-CFB)的0~1 mm给煤,借鉴传统煤粉锅炉制粉系统的设计及计算经验,开发PC-CFB锅炉0~1 mm制粉系统,其特征为采用中速磨煤机制备粉煤,利用气固分配器分离制粉乏气与粉煤的混合物,并设置备用系统以保证系统发生故障时的正常燃料供应。提出0~1 mm制粉系统的热力计算模型,确定磨煤机通风量、干燥剂配比以及干燥剂温度等关键技术指标,预测制粉系统干燥出力,并分析PC-CFB锅炉0~1 mm制粉系统的性能变化规律。研究结果表明:保持磨煤机出力、热风温度不变,在系统允许的范围内降低磨煤机出口温度,有利于降低干燥剂量,提升干燥出力;磨煤机出口温度每降低1℃,制粉系统所需的干燥剂量减少约523 m3/h,干燥出力增加约0.4 t/h。To realize the 0−1 mm coal feeding of the powdered coal-circulating fluidized bed,a 0−1 mm pulverizing system for PC-CFB boiler was developed based on the design and calculation experience of traditional pulverizing system.It was characterized by the use of vertical spindle mill to prepare the powdered coal and the use of gassolid distributor to separate the powdered coal from exhaust gas,and a backup system was set to ensure the normal fuel supply in case of system failure.The thermal calculation model of the 0−1 mm pulverizing system was proposed,the key technical indicators such as the ventilation volume of the mill,the proportion and temperature of the desiccant were determined,the drying output of the pulverizing system was predicted,and the performance of the 0−1 mm pulverizing system for PC-CFB boiler was analyzed. The results show that keeping the output of themill and the temperature of the hot air constant and reducing the outlet temperature of the mill within the allowablerange of the system can reduce the drying dosage and increase the drying output. For every 1 ℃ reduction in theoutlet temperature of the mill, the drying dosage required by the pulverizing system is reduced by about 523 m3/h,and the drying output is increased by about 0.4 t/h.

关 键 词：粉煤循环流化床 0~1 mm粉煤 制粉系统 热力计算 

分 类 号：TK111[动力工程及工程热物理—热能工程]