摘要
采用实时在线图像采集及计算机图像处理技术研究了不同条件下的型煤在热解过程中的膨胀与收缩特性.结果表明,400 ℃左右时型煤开始发生收缩,400 ℃～550 ℃和650 ℃～800 ℃是型煤发生收缩的两个高峰阶段,1 000 ℃体积收缩率达32%～44%.型煤的体积收缩大小主要与挥发分和灰分质量分数有关,型煤体积收缩率随着挥发分的增加而线性增大,随着灰分的增加而线性减小.横向、体积收缩率随着型煤密度的增大而减小;最大膨胀率和收缩率与密度成线性关系,随着密度的增大,最大膨胀率增大而收缩率减小.
A new method was applied to study the shrinkage characteristics of briquette during pyrolysis by realtime online images collection and computer image processing. The swelling and shrinkage characteristics of the briquette with different density were monitored using a digital camera during pyrolysis. Transient swelling and shrinkage phenomena were observed, and quantifative swelling and shrinkage were measured by computer images processing. The results show that the briquette begins to shrink at 400 ℃, and has two shrinkage ranges at 400 ℃ -550 ℃ and 650 ℃ -800 ℃. The lateral shrinkage and volume shrinkage decrease with the increase of briquette densities. The lateral shrinkage and the volume shrinkage were 12% - 18% and 32% -44%, respectively at 1 000 ℃ for 4 briquette samples with different densities. The volume shrinkage relates to sample contents of both the volatile matter and the ash. Generally, the volume shrinkage at 1 000℃ increases linearly with the increase of the volatile matter or the decreas of the ash content of briquette samples.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2005年第5期525-529,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(50474044)
国家杰出青年科学基金(50225415)。~~
关键词
型煤
煤热解
收缩
膨胀
briquette
coal pyrolysis
shrinkage
swelling
