陈兢
,
傅培舫
,
张斌
,
周怀春
工程热物理学报
采用化学热力学平衡的方法,对秸秆燃烧中K、Na、Cl的转化规律及形成的产物进行了研究,并与锅炉采样结果对照,讨论了生物质锅炉过热器严重积灰烧结的原因.研究结果表明,生物质中的K、Na、Cl在燃烧温度小于600℃时只存在于固相中.当温度大于600℃时产生气态的KCl、NaCl、KOH、NaOH、K、Na等.现场采样结果表明,生物质锅炉的过热器积灰烧结问题正是由这些气态碱金属化合物的凝结和硫酸盐化而引起的.
关键词:
生物质
,
碱金属
,
积灰烧结
,
化学平衡
,
热力学模拟
X.H. You
,
Q.L. Zhang and H.G. Guo Taiyuan Heavy Machinery Institute
,
Taiyuan 030024
,
China
金属学报(英文版)
The significance of this paper lies in the application of bending-upsetting 35CrMo steel in train crack-shaft. The hot deforming tests of 35CrMo steel have been done on the Gleeble-1500 testing machine with the deformation temperature at the range of 900癈-1250癈, a strain strain of 0.05 s-1, 0.5 s-1, 1.0 s-1 and compress degree of 15%-80%. Through respectively analyzing and studying the microstructure of the specimen and getting the data from the testing, the results obtained are as follows: the model of flow stress and the stress-strain relationship of material hot deformation, the model of dynamic and static re-crystallization and the correlative references of hot forming parameters and changes of microstructure. The hot deforming stress-strain curses and relevantly re-crystallized micro-structure of 35CrMo steel are drawn at the deformation temperature of 1250 and the strain rate of 1.0 s. Through analyzing and regressive calculating the grain size of the deformation specimen of 35CrMo steel at different locations under the large-deformation and high-temperature conditions, the hot-deforming model of grain calculation is verified. The experimental results and the model of grain calculation can provide scientific basis for analyzing the hot deformation processes and controlling quality.
关键词:
35CrMo steel
,
null
,
null
