加热棒技术在氧弹量热仪中的运用

Application of heating rod technology in oxygen bomb calorimeter

针对氧弹量热仪熔断式点火需人工缠绕点火丝从而导致操作繁琐、点火丝残留致使实际点火热与实验设定点火热不一致以及点火偶尔失败等问题,分析氧弹内部结构和点火丝点火的工作原理,将点火丝用高温绝缘陶瓷类材料包裹成加热棒,并将电阻丝加热区域集中在加热棒顶部,使加热棒顶部发热区域始终与待点火煤样接触,确保点火成功率满足要求。对氧弹量热仪的主机和氧弹进行改造,将氧弹内原有的熔断式点火方式改进为加热棒点火方式,并进行量热仪热容量标定以及煤样弹筒发热量测试。经大量实验证明,加热棒点火方式与熔断式点火方式的发热量检测结果间无显著性差异,可以相互替代使用,但加热棒点火方式可重复点火、降低劳动强度、提升设备自动化水平,从而提高了设备使用率。

Regarding to the problems of fused ignition of oxygen bomb calorimeter,such as complicated operation caused by manual winding of ignition wire,inconsistency between actual ignition heat and experimental setting ignition heat,and occasional failure of ignition,the internal structure of oxygen bomb and ignition principle of ignition wire are analyzed.The ignition wire was wrapped with high temperature insulating ceramic material into heating rod,and the heating area of resistance wire was concentrated on top of heating rod.The top of the rod was always in contact with the coal sample to be ignited,therefore,the ignition success rate could meet the requirements.Then the main engine of the oxygen bomb calorimeter and the oxygen bomb were reformed,the original fused ignition mode in the oxygen bomb was changed to the heating rod ignition mode,the calorimeter calorific capacity calibration and the calorific test of the coal sample cartridge were carried out.Through large amount of experiments,we can see that there is no significant difference between ignition mode and fuse ignition mode,they can replace each other,however,the heating rod ignition mode can be repeatedly ignited,which reduces the labor intensity,improves the automation level of equipment and the utilization rate of equipment.