阳极焙烧传热和热应力的数值模拟

建立了阳极焙烧的三维传热和热应力模型,以现场测定的升温曲线为边界条件,对阳极的升温过程和热应力的变化情况进行了数值模拟.结果表明:阳极内的热应力随温度梯度同步变化,其最大温度梯度和热应力与焙烧时间成抛物线关系.进入中温加热阶段时,阳极在宽度方向上具有最大的断面温差和最大的温度梯度,热应力也达到最大值.焙烧过程中,阳极宽度方向上的传热热流密度远大于长度和高度方向上的传热热流密度,两者相差大于一个数量级.

Numerical Simulation on Heat Transfer and Heat Stress of Carbon Anodes During Baking

A 3-dimmension heat transfer and stress model of carbon anodes during baking was established.The temperature raising process and heat stress variety in carbon anodes were simulated with the measured temperature curves as boundary condition.The results showed that the heat stress and temperature gradient in carbon anode synchronously change,and the most temperature gradient and the most heat stress have convex parabolic relation with baking time(first increased and then decreased).The temperature difference between center and surface and the temperature gradient in width direction and the heat stress raise maximum in modest reheating phase.The heat transfer flux in width direction is far more than 10 times that in length direction and highness direction.