针对锅炉点火装置平均故障间隔时间（MTBF）短且不方便维修问题，重新优化设计锅炉点火装置并将其在试验室成功应用。首先，将点火电极组件和高压接线盒组件由分体结构优化为一体结构，并采用拉簧替代原来的连接杆，使点火装置能够随着燃烧器风门移动具备伸缩功能。然后，将高压触头盒加长套在固定导向板内部，起到为拉簧和电极组件绝缘及导向作用，并将电极长度加长外装陶瓷护套，提高电极的抗氧化性。最后，取消前部固定板，将绝缘整体磁块改为上下两半的不锈钢压板，既可以防止重油在压板处结焦，也可以防止冷凝水滴落在压板上放电。优化后的锅炉点火装置在试验室进行了充分的应用验证，试验应用表明，优化后的锅炉点火装置运行稳定、可靠，平均故障间隔时间大大提高，由2360小时提高到4120小时，相当于每台锅炉可节约0.75台锅炉点火装置，可节约大量维修和更换成本，而且优化后的锅炉点火装置可随时在锅炉外部进行维修和更换，大大缩短维修和更换时间。

Aiming at the problem of short mean time between failures and inconvenient maintenance of boiler ignition device, the boiler ignition device was re-optimized and successfully applied in the laboratory. Firstly, the ignition electrode subassembly and high voltage junction box subassembly were optimized from separate structure into one structure, and the original connection rod was replaced by a tension spring, so that the ignition device can be moved with the burner damper. Then, the high voltage contact box was extended and covered inside the fixed guide plate to play the role of insulation and guidance for the tension spring and electrode subassembly, and the electrode length was extended with ceramic sheath to improve the oxidation resistance of the electrode. Finally, the front fixed plate was cancelled, and the insulated whole magnetic block was changed to the upper and lower half of the stainless steel plate, which can prevent the heavy oil from coking on the plate, and also prevent the condensate water from discharging on the plate. The optimized boiler ignition device has been fully verified in the laboratory, and the test application shows that the optimized boiler ignition device runs stably and reliably, and the mean time between failures of boiler ignition device is greatly increased from 2360 hours to 4120 hours, which is equivalent to saving 0.75 boiler ignition device per boiler and saving a lot of maintenance and replacement costs. Moreover, the optimized boiler ignition device could be maintained and replaced outside the boiler at any time, greatly reducing the maintenance and replacement time.

TP23