ASME Stainless Steel Shell and Tube Bundle Heat Exchanger

The shell and tube heat exchanger is composed of a shell, a heat transfer tube bundle, a tube plate, a baffle plate and a tube box. The shell is mostly cylindrical, and the tube bundle is arranged inside, and the two ends of the tube bundle are fixed on the tube plate.

The cold and hot fluids for heat transfer, one of which flows in the tube, are called tube flow; The other flows outside the tube, called shell flow. In order to improve the heat transfer coefficient of the fluid outside the tube, a number of baffles are usually installed in the shell.

The baffle can increase the velocity of the shell fluid, force the fluid to pass through the tube bundle several times according to the specified path, and enhance the degree of fluid turbulence.

The heat exchange tubes can be arranged in equilateral triangles or squares on the tube plate. The equilateral triangle arrangement is compact, the fluid turbulence outside the tube is high, and the heat transfer coefficient is large. The square arrangement is convenient for cleaning outside the tube and is suitable for fluids that are easy to scale.

Each time a fluid passes through a tube bundle is called a tube pass; Each pass through the shell is called a shell pass. The diagram shows the simplest single-shell single-tube heat exchanger, referred to heat exchanger. In order to increase the fluid velocity in the pipe, partitions can be arranged in the pipe boxes at both ends to divide all the pipes into several groups.