摘要
利用热重-红外联用(TGA-FTIR)技术,与蒙混煤、富动24煤对比,分析低水澳煤的燃烧特性,根据其着火温度、燃尽温度以及CO和CO2的析出规律分析其燃尽特性差的原因。由于其氧含量较低,煤化程度较高,因此可磨特性相对较差。低水分和较高灰分的特点导致低水澳煤燃尽时间延长,燃尽温度较高。在1030 MW机组上进行低水澳煤掺烧试验,试验期间磨煤机电流上升,随着澳煤掺烧量的增加,减温水量、飞灰含碳量和CO浓度逐渐升高,因此采用降低一次风速度和煤粉细度的手段促进其燃烧完全。
On the basis of thermogravimetric analyse and fourier transform infrared spectroscopy(TGA-FTIR)coupled technology,compared with Mongolian blended coal and Fudong 24 coal,combustion characteristics of the low-moisture Australian coal were analyzed.According to the calculated ignition temperature,burn-out temperature and the precipitation feature of CO and CO2,the low-moisture Australian coal was estimated to have poor burnout characteristics.Its oxygen content was lower than other two coal samples which meant it had a higher degree of coalification and relatively poor gindability.In addition,its burnout time was longer as a consequence of the characteristic of low moisture and high ash content.A co-combustion test was performed in a 1030 MW unit boiler using the Australian coal in separate coal mills whose current increased evidently during the test.With the increasing co-combustion amount of the low-moisture Australian coal,the desuperheating water flow,fly ash carbon content,and CO concentration increased correspondingly.A method of reducing primary air speed and fineness of the pulverized coal was used for better combustion.
作者
张海丹
杨威
黄华俊
王准
邱波
郎宁
ZHANG Haidan;YANG Wei;HUANG Huajun;WANG Zhun;QIU Bo;LANG Ning(Research and Development Institute, Zhejiang Energy Group, Hangzhou 311121, China;Zhejiang Provincial Key Laboratory of Energy Conservation & Pollutant Control Technology for Thermal Power, Hangzhou 311121, China)
出处
《锅炉技术》
北大核心
2020年第4期43-48,共6页
Boiler Technology
关键词
低水澳煤
热重
红外光谱
燃烧特性
掺烧
low-moisture australian coal
TGA
infrared spectroscopy
combustion characteristic
co-combustion
