关键词: 内热源, 移动球床, 温度分布

Abstract:

The temperature distribution in the channel of moving pebble beds with the local internal heat generation is important factor for design and operation of many devices including heat exchangers, reactors and dryers. The particle velocity is the key for the temperature distribution and heat transfer in the channel of moving pebble beds with the local internal heat generation. The correlation between the particle velocity and the outlet average temperatures (T₁ and T₂) of the internal heat generation zone and channel were theoretically analyzed. The three-dimensional numerical simulation was performed on FLUENT using the k-e model for the same physical model of the theoretical analysis. The outlet average temperature of the channel is agreed with the theoretical correlation and the relative error is lower than 8%. Based on the three cases of particle velocities, the outlet temperature of the local internal heat generation zone, the channel outlet temperature and the channel centre temperature are compared, and the temperature distribution characteristics of whole channel are predicted and analyzed. The results show that the channel temperature increased first then decreased along the vertical axis downward, and the temperature maximum was located the outlet of the internal heat generation zone. The outlet temperature of internal heat generation zone, the channel outlet temperature, and the center temperature decreased with the particle velocity increasing.

Key words: internal heat source, moving pebble bed, temperature distribution