Single-pass Tube Heat Exchanger

Single-pass tube heat exchanger is mainly composed of shell, tube plate, heat exchanger tube, header, folding baffle and other components.

Shell: Shell is the external framework of the heat exchanger, usually made of high-strength, corrosion-resistant materials, such as carbon steel, stainless steel and so on. Its main role is to protect the internal heat exchanger tube bundle, and allows another fluid to flow inside it, and heat exchange with the fluid inside the heat exchanger tube.

Tube Plate: The tube plate is an important part for fixing the heat exchanger tube and connecting the shell with the heat exchanger tube. It is usually made of thick steel plate, with sufficient strength and rigidity to withstand the effects of fluid pressure and temperature changes. The tube plate has holes equal to the number of heat exchanger tubes, which are used to insert and fix the heat exchanger tubes.

Heat exchanger tubes: Heat exchanger tubes are the core component of a tube heat exchanger and are responsible for transferring heat from one fluid to another. Heat exchanger tubes are usually made of materials with good thermal conductivity such as brass tubes, copper finned tubes or steel tubes. They are arranged in parallel in the shell to form a one-way flow channel.

Head: Head is the closed part of heat exchanger at both ends, usually made of the same material as the shell. Its main role is to close the shell, prevent fluid leakage, and allow the fluid to enter or leave the heat exchanger tube through the connecting tube.

Folding baffle: Folding baffle is usually installed in the shell, used to change the direction of fluid flow, increase the degree of turbulence of the fluid in the shell, so as to improve the efficiency of heat exchange.

The working principle of single-pass tube heat exchanger is based on the principles of heat conduction and convection. When two fluids of different temperatures pass through the tube and shell courses of a heat exchanger, heat is transferred from the higher temperature fluid through the heat exchanger tube wall to the lower temperature fluid due to temperature differences.

In a single-pass tube heat exchanger, one type of fluid (called tube fluid) enters from the connecting tube of the header, flows in the tube, and finally flows out of the outlet tube at the other end of the header, forming a single-pass flow. The other fluid (called shell flow) enters from the receiver of the shell, flows inside the shell, exchanges heat with the fluid outside the heat exchanger tube, and finally exits from another receiver on the shell.

The heat transfer process mainly consists of conduction and convection. Conduction is the process of heat transfer from one molecule to another through vibration and collision of molecules of substances, mainly occurring on the tube wall. Convection is the flow of fluid due to temperature differences, which accelerates the heat transfer process, mainly in the interface between the fluid and the pipe wall contact.

Features

High heat transfer efficiency: single-pass tube heat exchanger through the single-pass flow design, so that the heat exchange between the fluid inside the tube and the fluid outside the tube is more adequate, high heat transfer efficiency.

Compact structure: the heat exchanger has a compact structure, covers a small area and is easy to install and maintain.

Wide range of application: the single-pass tube heat exchanger can handle a variety of types of fluids, whether it is liquid and liquid, gas and gas, or liquid and gas between the heat transfer task can be competent. At the same time, it also has good adaptability to different temperature and pressure conditions.

Reliable: the shell and tube bundle are usually made of high-quality metal materials with good mechanical strength and corrosion resistance, capable of withstanding high pressure and temperature to ensure the stability and safety of the equipment during long-term operation.

Applications

Single Pass shell tube heat exchanger plays a vital role in industrial production. It is often used in chemical, petroleum, electric power, food, pharmaceutical and other industries in the heating, cooling, condensation, evaporation and absorption processes. For example, in chemical production, single-pass tube heat exchanger can be used at the entrance and exit of the reactor for heating or cooling the reactants; in electric power production, it is installed in the circulating water system of boiler and turbine for cooling the circulating water.