By the shell tube heat exchanger, heat transfer tube bundle, tube plate, baffleplate (damper) and tube box and other parts. Many for cylindrical shell, internalwith bundles, both ends fixed on the tube plate. Two fluid on heat transfer ofheat and cold, a pipe flow, known as the fluid passes; Another outside the pipeflow, known as the shell side fluid. In order to improve the heat transfer coefficient,outside the pipe fluid several baffles are generally installed in the shell. The shell side of the damper can improve the fluid velocity, forcing fluid according to the rules distance horizontally through the tube bundle for many times,increasing the extent of fluid turbulence. On the tube plate heat exchange tube can be sorted by an equilateral triangle, or square. Equilateral triangle arrangement is more compact, tube fluid turbulent degree is high, the heat transfer coefficient of points; A square array is outside the pipe cleaning convenient, suitable for easy scaling of the fluid.