High-power electrical heating tubular preheater

The invention discloses a high-power electrical heating tubular preheater. The preheater comprises 3N preheater heating pipelines, an induction voltage regulator and three large-current transformers, wherein the induction voltage regulator is connected with the large-current transformers, and the large-current transformers are connected with the preheater heating pipelines. The 3N preheater heating pipelines are circumferentially distributed at equal intervals, every two preheater heating pipelines are parallel, and the high-power electrical heating tubular preheater achieves a good insulating effect under the condition of not increasing an insulating flange, omits the insulating flange, reduces potential water leakage and electric leakage points of a thermal engineering loop, reduces the number of power supply electrodes connected to the pipelines by half, reduces line loss, saves materials and space for layout of the thermal engineering loop, guarantees heating efficiency and safety, and has good economic benefits and technical effects.