Tube Bundle Heat Exchanger

Tube bundle heat exchanger, also known as tube heat exchanger, is a heat exchange equipment widely used in chemical, petroleum, pharmaceutical, energy and other industrial fields. It transfers heat through the fluid in the pipeline and the external medium to achieve temperature regulation and energy conversion.

Tube bundle heat exchanger is mainly composed of two parts: tube bundle and shell. The bundle consists of a number of small diameter tubes that are fixed to one or more tube plates to form a fluid passage, called a pipe path. The shell is an outer shell with a certain space inside for the import, export and circulation of fluids. The space channel between the tube bundle and the shell is called the shell pass, and another fluid flows in the shell pass and exchanges heat with the fluid in the tube pass.

The operation principle of the bundle heat exchanger is based on three basic modes of heat transfer process: conduction, convection and radiation.

1. Conduction: When the higher temperature fluid flows through the pipe, the pipe wall absorbs the heat of the fluid, and transfers the heat to the lower temperature fluid or environmental medium through the vibration and collision of material molecules. In tube bundle heat exchangers, the conduction mainly occurs in the metal pipe wall.

2. Convection: Convection is the process by which parts of a fluid with different temperatures move relative to each other, thereby transferring heat. In a tube bundle heat exchanger, convection occurs at the interface where the fluid contacts the tube wall and inside the fluid. When the hot fluid is in contact with the tube wall, heat is transferred to the tube wall by conduction, while the fluid flows in the tube and transfers heat to the cold fluid through contact with the tube wall and convection heat transfer.

3. Radiation: Although radiation is not the primary mode of heat transfer in bundle heat exchangers, it may become important under certain conditions, such as high temperatures or vacuum environments.

1. Tube bundle structure: The tube bundle is composed of many small-diameter tubes arranged in parallel, which can be straight tubes, U-shaped tubes or spiral tubes to adapt to different process requirements.

2. Shell design: The shell is a sealed shell with enough space inside for fluid flow and heat transfer. The shell is provided with an inlet and outlet nozzle for fluid entry and exit.

3. Baffle plate: In order to enhance the disturbance and heat transfer effect of the shell flow, the baffle plate is permanently installed in the shell. The baffle can change the flow direction of the fluid and make the fluid form a complex flow path in the shell, so as to improve the heat transfer efficiency.

1. High heat transfer efficiency: the tube bundle structure of the tube bundle heat exchanger makes the contact area between the fluid and the wall increase, and the heat transfer efficiency is higher.

2. Suitable for a wide range of fluids and working conditions of different temperatures and pressures.

3. Compact structure: small footprint, easy installation and layout

4. Easy maintenance: The tube bundle is simple in structure, and it is relatively easy to clean and replace the pipe

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