Shell and tube type heat exchanger consists of a shell and tube bundle contained many, between the cold, thermal fluid heat exchanger heat transfer through the wall. The shell and tube heat exchanger is a kind of traditional standard heat exchanger, shell and tube type heat exchanger has been widely used in chemical industry, oil refining, petrochemical, power, nuclear power and other industrial equipment, especially in the high temperature and high pressure and large heat exchanger in occupy absolute advantage.