摘要
横管跑道型结构炉管是煤焦油加热炉中的重要部件,煤焦油中携带的固体颗粒会对弯头管壁造成冲蚀,研究在不同条件下弯头管道处的冲蚀规律对安全生产具有重要意义。利用FLUENT软件模拟炉管弯管处液固两相流流动规律,分析在不同质量流、流速、温度、颗粒直径下固体颗粒对管壁的冲蚀规律。结果表明,弯管整体部分会产生断断续续区域性的冲蚀,其中最严重的部分发生在弯管中间处。流体的颗粒质量流量、速度、温度及颗粒直径的增大均会增大管壁处的最大冲蚀率,质量流量、流体速度与冲蚀速率之间呈二次函数关系,质量流量增加到0.11 kg/s后会对冲蚀率产生一定的抑制作用;流体速度对冲蚀率影响最大。流体的温度在20~50℃内,温度升高改变流体黏度系数成为冲蚀率增加的主要因素,在50~60℃,颗粒动能与流体黏度的耦合作用是导致最大冲蚀率减小的主要因素。当颗粒直径在50~200μm,冲蚀速率随着颗粒直径增大增加较慢。研究结果对于预测加热炉炉管冲蚀情况、预测最大冲蚀位置、适当增加炉管壁厚、提高炉管使用年限具有重要的参考意义。
The horizontal pipe racetrack structure furnace pipe is an important part for the coal tar heating furnace, and the solid particles carried in the coal tar will cause erosion for the elbow pipe wall. Thus, it is of great significance for safety production to study the erosion rule of elbow pipes under different conditions. Hence, FLUENT software was used to simulate the flow law of liquid-solid two-phase flow at furnace pipe bend, and the erosion law of solid particles on pipe wall was analyzed under different mass flow, velocity, temperature and particle diameter. The results show that the whole part of the bending pipe will produce intermittent and regional erosion, and the most serious part will occur in the middle of the bending pipe. The increase of particle mass flow rate, velocity, temperature and particle diameter of the fluid will increase the maximum erosion rate at the pipe wall, and the relationship between mass flow rate, fluid velocity and erosion rate is a quadratic function. When the mass flow rate increases to 0.11 kg/s, the erosion rate will be inhibited to some extent. Fluid velocity has the greatest influence on corrosion rate. When the temperature of the fluid is within 20 to 50 ℃, the increase in temperature changes the viscosity coefficient of the fluid and becomes the main factor for the increase of erosion rate. When the temperature rises to range of 50 to 60 ℃, the coupling effect of particle kinetic energy and fluid viscosity is the main factor for the decrease of the maximum erosion rate. When the particle diameter is within the range of 50 to 200 μm, the erosion rate rises slowly with the increase of particle diameter. The research results have important referent significance for predicting the erosion condition of furnace tube and the maximum erosion position, appropriately enriching the thickness of furnace tube wall and increasing the service life of furnace tube.
作者
李守宝
朱宏武
张金亚
辛佳兴
LI Shou-bao;ZHU Hong-wu;ZHANG Jin-ya;XIN Jia-xing(College of Machinery and Storage and Transportation Engineering,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《科学技术与工程》
北大核心
2020年第23期9335-9341,共7页
Science Technology and Engineering
关键词
固液两相流
煤焦油
横管跑道型炉管
最大冲蚀速率
颗粒
温度
solid-liquid two phase flow
coal tar
horizontal and racetrack type furnace tube
maximum erosion rate
particles
temperature
