Tubular heat exchanger and packaging method of tubular heat exchanger

A tubular heat exchanger comprising:

• an upper tube plate box being a rectangular parallelepiped, wherein a first sealing rubber is filled in the upper tube plate box;
• a lower tube plate box being a rectangular parallelepiped, wherein a second sealing rubber is filled in the lower tube plate box;
• a plurality of heat exchange tubes, wherein each of the plurality of heat exchange tubes comprises an inlet end and an outlet end opposite to the inlet end, the inlet end extends through the upper tube plate box, the outlet end extends through the lower tube plate box, the first sealing rubber is filled in a gap between the plurality of heat exchange tubes and the upper tube plate box, and the second sealing rubber is filled in a gap between the plurality of the heat exchange tubes and the lower tube plate box;
• and
• pressure bolts situated on each of the upper tube plate box and the lower tube plate box, and configured for applying and adjusting a sealing pressure of the tubular heat exchanger.