Tube heat exchanger

Product Overview

A tubular heat exchanger, also known as a shell and tube heat exchanger, is a wall to wall heat exchanger with the wall of the tube bundle enclosed in the shell as the heat transfer surface. This type of heat exchanger can be made of various structural materials (mainly metal materials) and can be used under high temperature and high pressure. It has a simple structure, low cost, wide flow cross-section, and is easy to clean scale.

According to their types, they can be divided into fixed tube sheet tube heat exchangers, floating head tube heat exchangers, packed box tube heat exchangers, U-shaped tube tube heat exchangers, eddy current film tube heat exchangers, baffle tube heat exchangers, and multi shell tube heat exchangers.

Structural process

A tubular heat exchanger consists of a shell, heat transfer tube bundle, tube sheet, baffle (baffle), and tube box. The shell is mostly cylindrical, with a tube bundle inside, and the two ends of the tube bundle are fixed on the tube plate. Two types of fluids, hot and cold, are used for heat exchange. One flows inside the tube and is called the tube side fluid; Another type of fluid that flows outside the tube is called shell side fluid.

To improve the heat transfer coefficient of the fluid outside the pipe, several baffles are usually installed inside the shell. The baffle can increase the velocity of the shell side fluid, forcing the fluid to pass through the bundle laterally multiple times according to the specified path, and enhancing 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 relatively compact, resulting in high turbulence of the fluid outside the tube and a large heat transfer coefficient; Square arrangement makes cleaning outside the tube convenient and suitable for fluids that are prone to scaling.

Each time a fluid passes through a tube bundle is called a tube pass; Each pass through the shell is called a shell pass. To increase the fluid velocity inside the pipe, partitions can be installed inside both ends of the pipe box to divide all pipes into several groups. This way, the fluid only passes through a portion of the tubes at a time, so it travels back and forth multiple times in the bundle, which is called multi tube pass. Similarly, to increase the flow velocity outside the pipe, longitudinal baffles can also be installed inside the shell to force the fluid to pass through the shell space multiple times, known as multi shell pass. Multi tube and multi shell can be used in conjunction.

Volumetric heat exchanger

Product Introduction:

The RV03/RV04 series positive displacement heat exchanger is suitable for hot water heating systems in general industrial and civil buildings, with steam or high and low temperature softened water as the heat medium (the type of heat medium should be specified in the design selection). Its characteristics include:

1. Adopting small tube diameter heat transfer beam and secondary heat transfer of heat medium;

2. Adding flow guiding and blocking devices inside the tank significantly improves the heat transfer coefficient;

3. Adopting a new type of heat exchange tube bundle, multiple processes, high utilization rate of heat medium, and energy saving;

Design Usage Instructions:

1. The outlet temperature of the heated water should not exceed 75 ℃. In actual use, to delay scaling, the temperature of the heated water should be controlled between 50-60 ℃. To ensure safer operation, a drain valve must be installed on the outlet pipe of the heat medium.

2. Material: The shell can be selected according to user requirements, including stainless steel type, carbon steel lined stainless steel type, and carbon steel lined copper type; The materials for heat exchange U-tubes are divided into stainless steel tubes and copper tubes. The exterior of the carbon steel shell is sprayed with mixed paint for corrosion prevention.

3. The RV-03 product adopts steel saddle type supports, usually made of concrete piers with a height of H=300mm, and bolt hole positions are reserved according to the support installation diagram; RV-04 adopts a support type support, usually made of concrete piers with a height of H=200mm, and bolt hole positions are reserved according to the support installation diagram.

4. Heat exchangers should be equipped with safety devices. When installing a safety valve, the opening pressure of the safety valve should not exceed the design pressure (to be declared when ordering the safety valve), and the installation and use of the safety valve should comply with the provisions of the "Technical Supervision Regulations for Pressure Vessel Safety" issued by the Ministry of Labor and Human Resources.

Main purpose:

1. Hot water supply for high-end hotels, restaurants, government agencies, factories, schools, residential communities, and swimming pools;

2. Process hot water supply for industrial and civil buildings such as chemical, refining, and shipbuilding.