高温煅烧石油焦排料过程余热回收

为了实现煅烧石油焦在排料过程中余热的高效回收利用, 本文利用自行搭建的高温煅烧石油焦余热回收试验系统, 研究了煅后焦当量排料速度、换热管类型、换热器当量入口流速等参数变化对余热回收性能的影响规律。试验结果表明:利用余热回收换热器既可实现煅后焦余热的高效回收, 平均余热回收效率为78.9%, 又能实现煅后焦的均匀冷却, 温度不均匀系数仅为0.0757;随着煅后焦当量排料速度的增加, 内换热器和外换热器的传热系数均逐渐增加, 余热回收效率先增加后降低;翅片型换热器比光管型换热器的换热性能明显提高, 余热回收效率提高了7.4%, 同时换热器出口处煅后焦的温度不均匀系数减少了32.6%;随着当量入口流速的增加, 外换热器和内换热器的传热系数均逐渐增加。

Experimental investigation on waste heat reutilization of calcined petroleum coke

This paper investigated the heat transfer between a new type of heat exchanger and the flowing calcined petroleum coke(CPC). The experimental system of waste heat utilization exchanger was installed in the tank calcined furnace. The effects of various CPC equivalent mass flow rate, heat exchange pipe type and water equivalent mass flow rate on the heat transfer efficiencies were experimentally investigated. The results showed that the waste heat exchanger could effectively use the waste heat generated by CPC with an average reutilization ratio of 78.9%. The CPC could be cooled evenly with a non-uniformity temperature coefficient of 0.0757. As CPC equivalent mass flow rate increased, the heat transfer coefficient of heat exchanger increased, and the utilization ratio of waste heat increased first and then decreased. Compared with light-tube heat exchanger tube, fin-tube heat exchanger had better heat transfer performances, with 7.4% higher waste heat utilization ratio and 32.6% less non-uniformity temperature coefficient. The heat transfer coefficient increased with the increase of water equivalent mass flow rate.