What’s the Design and Manufacture & Application of Double Tube Sheet Heat Exchanger?

Heat exchanger is a kind of energy-saving equipment to achieve heat transfer between materials, is a process equipment commonly used in petroleum, chemical, metallurgical, electric power, light industry, food and other industries. In the production of anti-corrosion, anti-fouling, or for the process and labor protection, safety and other requirements for some heat exchanger equipment is often used double tube plate structure to solve the problem. Double tube plate heat exchanger is currently a relatively new structure.

At the end of the heat exchanger tube has a tube plate, called the outer tube plate, also known as the tube process tube plate, and as the equipment flange, with the heat exchanger tube and tube box flange connected. There is also a tube plate at a position closer to the end of the heat exchanger tube, called the inner tube plate, that is, the shell process tube plate, connected with the heat exchanger tube and shell process. The outer tube plate and the inner tube plate between a certain distance, this part of the space can be separated from the outside world with a short section, the composition of a non-pressure isolation chamber; can also be an open structure.

For double tube plate heat exchanger, there are two design concepts of understanding: one that double tube plate heat exchanger used to absolutely prevent the media between the shell and tube process mixed cascade of occasions, the design of the cavity between the inner and outer tube plate is equipped with liquid discharge pour shower valve for daily observation and the inner tube plate leakage occurs when the discharge, so that the tube and shell process media is effectively isolated from the inner and outer two layers of the tube plate. This is the main purpose of using double tube plate structure type. Another think double tube plate heat exchanger can be used between the tube and shell process media pressure difference is very large occasions, designed to add a medium in the cavity between the inner and outer tube plate to reduce the pressure difference between the tube and shell process media. This is the same as the general single tube plate heat exchanger, can not absolutely guarantee that the outer tube plate on the mouth of the tube does not leak. The isolation cavity between the double tube plate is the main difference with the single plate heat exchanger structure, the isolation cavity is not connected with the tube process, shell process, do not bear the medium pressure, but bear the mechanical load of the equipment and thermal load. The load-bearing capacity of the isolation chamber mainly depends on the double tube plate spacing. Fixed double tube plate shell process hydraulic test, the inner tube plate and heat exchanger tube connection may have leakage, so in determining the distance between the double tube plate must consider the minimum space required for observation, leak detection.