摘要
对进入气化炉前的水煤浆预热可以提高气化效率和降低氧耗。提出采用旋梯式螺旋折流板换热器预热水煤浆,水煤浆在换热器壳侧流动,导热油作为热流体在管侧流动。基于实验,研究了在换热器壳侧预热水煤浆的可行性、导热油定性温度和水煤浆流量对流动换热性能的影响,得到了壳侧传热和阻力系数关联式。实验结果表明,水煤浆在换热器壳侧流动换热是完全可行的;提高导热油定性温度可以提高水煤浆温升和总传热系数,同时降低壳侧压降;提高水煤浆流量可以提高总传热系数,但是壳侧压降增大。研究结果为开展水煤浆预热设备的研究提供了基础,对水煤浆预热的工况选择具有重要意义。
Preheat of coal water slurry (CWS) before it entering gasifier can improve gasification efficiency and reduce oxygen consumption. Shell-and-tube heat exchangers with ladder-type fold baffles were proposed to preheat CWS which flows through the shell side, while conductive oil flows through the tube side as the hot fluid. Based on the experimental study, the feasibility of preheating CWS in the shell side of heat exchangers, and effects of conductive oil reference temperature and CWS flow rate on flow and heat transfer performance were studied. Empirical correlations of Nus and fs were obtained. The experimental results show that it is completely feasible to preheat CWS in the shell side of heat exchangers. Increasing the conductive oil reference temperature can increase the temperature difference of CWS and the overall heat transfer coefficient, while the shell side pressure drop is decreased. Increasing the CWS flow rate can increase the overall heat transfer coefficient, but higher shell side pressure drop is obtained. The research results provide guidelines for further study of CWS preheating equipment and are beneficial for working condition selection of CWS preheating.
作者
王斯民
叶树沛
肖娟
宋晨
张早校
文键
WANG Si-min;YE Shu-pei;XIAO Juan;SONG Chen;ZHANG Zao-xiao;WEN Jian(School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2019年第2期298-307,共10页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(51676146)
中央高校基本科研业务费专项资金(xjj2018202)
关键词
水煤浆预热
管壳式换热器
旋梯式螺旋折流板
流动
传热
工况选择
coal water slurry preheating
shell-and-tube heat exchangers
ladder-type fold baffles
flow
heat transfer
working conditions selection
