Tubular reactor

The utility model belongs to the technical field of chemical mechanical equipment, and particularly relates to a tubular reactor. Comprising a shell, and the shell comprises a first barrel, a second barrel, a third barrel, an upper seal head and a lower seal head; sealing plates are arranged at the upper end and the lower end of the first barrel respectively, a first containing cavity is formed by the sealing plates at the upper end and the lower end and the inner wall of the first barrel, a second containing cavity is formed among the upper end sealing plate, the inner wall of the second barrel and the upper sealing head, and a third containing cavity is formed among the lower end sealing plate, the inner wall of the third barrel and the lower sealing head; a plurality of vertically-arranged communicating pipes are arranged in the first containing cavity, and the communicating pipes communicate with the second containing cavity and the third containing cavity. According to the utility model, the communicatin