焦炉上升管中煤焦油流动特性的实验研究

为除去焦炉荒煤气显热回收过程中冷凝结焦在换热管壁表面的煤焦油,以煤焦油高温黏温特性曲线为实验依据,研究了200~800℃煤焦油在普通碳钢管道表面和镀镍涂层管道表面的流动特性情况,并线性拟合出煤焦油流动特性随温度变化的关系方程。结果表明:温度与换热管道表面煤焦油的流动特性之间呈现很好的指数关系;当管壁温度达到400℃左右时,普通碳钢管道表面的煤焦油由于流动特性的改变而基本脱除干净,镀镍涂层管道的温度在350℃左右;镀镍涂层管道在抑制结焦方面明显优于普通碳钢管道,其抑制结焦率在20%左右。

Flow characteristics of coal tar in coke oven ascension pipe

To remove coal tar congealed and coked on the surface of the heat pipe wall in the process of sensible heat recovery of coke oven gas, based on the viscosity-temperature characteristic curve of coal tar, research the flow characteristics of coal tar on the plain carbon steel and Nickel-plated pipes surface between 200℃ and 800℃, and obtain the fitting relation equation of flow characteristic and temperature of coal tar.The resuhs show that there is a good index relationship between temperature and flow characteristics of coal tar on the surface of heat piper wall.Most coal tar can be removed on the surface of plain carbon steel for the changing of flow characteristics when the temperature of tube wall reaches around 400℃.The effect is the same when the temperature of Nickel- plated pipes is about 350℃ .Nickel-plated pipe line, whose inhibiting coking rate is about 20 percemt, is inherently better than plain carbon steel.