Tube-in-tube heat exchanger

Product Overview

Shell-and-tube heat exchangers are primarily composed of a shell, baffles, heat transfer tubes, end caps, and baffle plates. They can be manufactured using either carbon steel or stainless steel. During heat exchange, one fluid enters through a connection pipe at the end cap, flows through the tubes, and exits through the outlet pipe at the opposite end of the end cap, which is referred to as the tube side; the other fluid enters through a connection on the shell and exits through another connection on the shell, known as the shell side.

Fixed tube sheet heat exchanger

       The structure is simple, compact, and cost-effective, but it cannot be mechanically cleaned outside the tubes. The tube bundle is connected to the tube plates, which are welded to both ends of the shell. A top cover is attached to these plates, and it features fluid inlet and outlet connections. Typically, a series of vertical baffles perpendicular to the tube bundle are installed outside. The钢管 and tube plates are rigidly connected to the shell, while the fluids inside and outside the tubes are at different temperatures. Consequently, when there is a significant temperature difference between the tube wall and the shell wall, due to the different thermal expansions, a large temperature difference stress is generated, which can cause the tubes to twist, bend, or even become loose from the tube plates, potentially damaging the heat exchanger. Generally, when the temperature difference between the tube wall and the shell wall exceeds 50°C, for safety reasons, the heat exchanger should be equipped with a temperature difference compensation device. However, the compensation device (expansion joint) can only be used when the temperature difference between the shell wall and the tube wall is below 60 ~ 70°C and the shell-side fluid pressure is not high. Typically, when the shell-side pressure exceeds 0.6Mpa, due to the thick compensation ring, it becomes difficult to expand and contract, losing its temperature difference compensation function, and alternative structures should be considered.

U-tube heat exchanger

       U-tube heat exchangers, each tube bent into a U-shape, both ends fixed on the same tube plate, allowing each tube to expand freely to address thermal compensation issues. The tube side has at least two passes, with the bundle removable for cleaning and tubes free to expand. The structure is simple, lightweight, and suitable for high temperature and high-pressure conditions.

Immersion Snake Tube Heat Exchanger

       A heat exchanger using a serpentine tube as the heat transfer element is one type of shell-and-tube heat exchanger. It features a simple structure, ease of manufacturing, installation, cleaning, and maintenance, affordability, and is particularly suited for cooling high-pressure fluids, thus it is still in use.

Technical Specifications