Abstract: The traditional liquefied gas flame heating method has been long used for pipe-end preheating before welding in construction of a pipeline. This method cannot match with modern large-scale industrialized construction of pipelines owing to its low heating efficiency, heterogeneous heating temperature and inclination to influence of climatic conditions. China Petroleum Pipelines Bureau No.3 Branch Company has developed the GDJR series of pipe electromagnetic induction heating equipment to meet China’s need for high-quality and high-efficiency construction of pipelines. This equipment adopts electromagnetic induction eddy current heating principle to preheat pipe end. Composed of intermediate frequency heating power supply and electromagnetic induction heater, this equipment can be used to preheat oil and gas steel pipe before welding, keep temperature after welding, and preheat for anti-corrosion and joint wrapping. The rated work of the equipment is 50kW while the rated work frequency is 15 to 20kHz. The temperature rising speed is 35 to 50°C/min. It has a number of advantages, such as small in volume, light in weight, quick in temperature-rising speed, convenient in operation and reliable in safety. Localized and put into wide application in construction of a number of domestic oil and gas pipelines at the present time, this equipment significantly improves preheating efficiency for pipeline construction and technically reduces the cost of engineering construction

Key words: petroleum, natural gas, pipeline, electromagnetic induction heating

摘要： 管道施工焊接前管口预热长期沿用传统的液化气火焰加热方式,升温效率低,加热温度不均匀,受气候条件影响大,与现代大规模工业化管道施工极不匹配。中国石油天然气管道局第三工程分公司针对我国管道建设优质高效施工的要求,开发研制了GDJR系列管道电磁感应加热设备。该设备采用电磁感应涡流发热原理对管口预热,由中频加热电源和电磁感应加热器组成,可用于油气钢管道焊前预热、焊后保温、防腐补口预热等。设备额定功率为50kW,额定工作频率为15~20kHz,升温速度为35~50℃/min,具有体积小、重量轻、升温速度快、操作方便、安全可靠等特点。目前已在国内多条油气管道工程中批量应用,实现了国产化,大幅提高了管道施工预热工效,为工程施工降本增效提供了技术支持。

关键词: 石油, 天然气, 管道, 电磁感应加热